diff options
131 files changed, 5470 insertions, 3089 deletions
diff --git a/Documentation/ABI/obsolete/proc-sys-vm-nr_pdflush_threads b/Documentation/ABI/obsolete/proc-sys-vm-nr_pdflush_threads deleted file mode 100644 index b0b0eeb..0000000 --- a/Documentation/ABI/obsolete/proc-sys-vm-nr_pdflush_threads +++ /dev/null @@ -1,5 +0,0 @@ -What: /proc/sys/vm/nr_pdflush_threads -Date: June 2012 -Contact: Wanpeng Li <liwp@linux.vnet.ibm.com> -Description: Since pdflush is replaced by per-BDI flusher, the interface of old pdflush - exported in /proc/sys/vm/ should be removed. diff --git a/Documentation/block/biodoc.txt b/Documentation/block/biodoc.txt index 9490f28..8692702 100644 --- a/Documentation/block/biodoc.txt +++ b/Documentation/block/biodoc.txt @@ -216,10 +216,9 @@ may need to abort DMA operations and revert to PIO for the transfer, in which case a virtual mapping of the page is required. For SCSI it is also done in some scenarios where the low level driver cannot be trusted to handle a single sg entry correctly. The driver is expected to perform the -kmaps as needed on such occasions using the __bio_kmap_atomic and bio_kmap_irq -routines as appropriate. A driver could also use the blk_queue_bounce() -routine on its own to bounce highmem i/o to low memory for specific requests -if so desired. +kmaps as needed on such occasions as appropriate. A driver could also use +the blk_queue_bounce() routine on its own to bounce highmem i/o to low +memory for specific requests if so desired. iii. The i/o scheduler algorithm itself can be replaced/set as appropriate @@ -1137,8 +1136,8 @@ use dma_map_sg for scatter gather) to be able to ship it to the driver. For PIO drivers (or drivers that need to revert to PIO transfer once in a while (IDE for example)), where the CPU is doing the actual data transfer a virtual mapping is needed. If the driver supports highmem I/O, -(Sec 1.1, (ii) ) it needs to use __bio_kmap_atomic and bio_kmap_irq to -temporarily map a bio into the virtual address space. +(Sec 1.1, (ii) ) it needs to use kmap_atomic or similar to temporarily map +a bio into the virtual address space. 8. Prior/Related/Impacted patches diff --git a/Documentation/block/null_blk.txt b/Documentation/block/null_blk.txt index 3140dbd..733927a 100644 --- a/Documentation/block/null_blk.txt +++ b/Documentation/block/null_blk.txt @@ -38,7 +38,7 @@ gb=[Size in GB]: Default: 250GB bs=[Block size (in bytes)]: Default: 512 bytes The block size reported to the system. -nr_devices=[Number of devices]: Default: 2 +nr_devices=[Number of devices]: Default: 1 Number of block devices instantiated. They are instantiated as /dev/nullb0, etc. @@ -52,13 +52,13 @@ irqmode=[0-2]: Default: 1-Soft-irq 2: Timer: Waits a specific period (completion_nsec) for each IO before completion. -completion_nsec=[ns]: Default: 10.000ns +completion_nsec=[ns]: Default: 10,000ns Combined with irqmode=2 (timer). The time each completion event must wait. -submit_queues=[0..nr_cpus]: +submit_queues=[1..nr_cpus]: The number of submission queues attached to the device driver. If unset, it - defaults to 1 on single-queue and bio-based instances. For multi-queue, - it is ignored when use_per_node_hctx module parameter is 1. + defaults to 1. For multi-queue, it is ignored when use_per_node_hctx module + parameter is 1. hw_queue_depth=[0..qdepth]: Default: 64 The hardware queue depth of the device. @@ -73,3 +73,12 @@ use_per_node_hctx=[0/1]: Default: 0 use_lightnvm=[0/1]: Default: 0 Register device with LightNVM. Requires blk-mq and CONFIG_NVM to be enabled. + +no_sched=[0/1]: Default: 0 + 0: nullb* use default blk-mq io scheduler. + 1: nullb* doesn't use io scheduler. + +shared_tags=[0/1]: Default: 0 + 0: Tag set is not shared. + 1: Tag set shared between devices for blk-mq. Only makes sense with + nr_devices > 1, otherwise there's no tag set to share. diff --git a/MAINTAINERS b/MAINTAINERS index e372994..ba3d8c1 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2562,10 +2562,12 @@ S: Maintained F: drivers/net/hamradio/baycom* BCACHE (BLOCK LAYER CACHE) +M: Michael Lyle <mlyle@lyle.org> M: Kent Overstreet <kent.overstreet@gmail.com> L: linux-bcache@vger.kernel.org W: http://bcache.evilpiepirate.org -S: Orphan +C: irc://irc.oftc.net/bcache +S: Maintained F: drivers/md/bcache/ BDISP ST MEDIA DRIVER @@ -12085,7 +12087,6 @@ F: drivers/mmc/host/sdhci-omap.c SECURE ENCRYPTING DEVICE (SED) OPAL DRIVER M: Scott Bauer <scott.bauer@intel.com> M: Jonathan Derrick <jonathan.derrick@intel.com> -M: Rafael Antognolli <rafael.antognolli@intel.com> L: linux-block@vger.kernel.org S: Supported F: block/sed* diff --git a/arch/xtensa/platforms/iss/simdisk.c b/arch/xtensa/platforms/iss/simdisk.c index c45b90b..1b64184 100644 --- a/arch/xtensa/platforms/iss/simdisk.c +++ b/arch/xtensa/platforms/iss/simdisk.c @@ -110,13 +110,13 @@ static blk_qc_t simdisk_make_request(struct request_queue *q, struct bio *bio) sector_t sector = bio->bi_iter.bi_sector; bio_for_each_segment(bvec, bio, iter) { - char *buffer = __bio_kmap_atomic(bio, iter); + char *buffer = kmap_atomic(bvec.bv_page) + bvec.bv_offset; unsigned len = bvec.bv_len >> SECTOR_SHIFT; simdisk_transfer(dev, sector, len, buffer, bio_data_dir(bio) == WRITE); sector += len; - __bio_kunmap_atomic(buffer); + kunmap_atomic(buffer); } bio_endio(bio); diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c index a4783da..889a854 100644 --- a/block/bfq-iosched.c +++ b/block/bfq-iosched.c @@ -108,6 +108,7 @@ #include "blk-mq-tag.h" #include "blk-mq-sched.h" #include "bfq-iosched.h" +#include "blk-wbt.h" #define BFQ_BFQQ_FNS(name) \ void bfq_mark_bfqq_##name(struct bfq_queue *bfqq) \ @@ -724,6 +725,44 @@ static void bfq_updated_next_req(struct bfq_data *bfqd, } } +static unsigned int bfq_wr_duration(struct bfq_data *bfqd) +{ + u64 dur; + + if (bfqd->bfq_wr_max_time > 0) + return bfqd->bfq_wr_max_time; + + dur = bfqd->RT_prod; + do_div(dur, bfqd->peak_rate); + + /* + * Limit duration between 3 and 13 seconds. Tests show that + * higher values than 13 seconds often yield the opposite of + * the desired result, i.e., worsen responsiveness by letting + * non-interactive and non-soft-real-time applications + * preserve weight raising for a too long time interval. + * + * On the other end, lower values than 3 seconds make it + * difficult for most interactive tasks to complete their jobs + * before weight-raising finishes. + */ + if (dur > msecs_to_jiffies(13000)) + dur = msecs_to_jiffies(13000); + else if (dur < msecs_to_jiffies(3000)) + dur = msecs_to_jiffies(3000); + + return dur; +} + +/* switch back from soft real-time to interactive weight raising */ +static void switch_back_to_interactive_wr(struct bfq_queue *bfqq, + struct bfq_data *bfqd) +{ + bfqq->wr_coeff = bfqd->bfq_wr_coeff; + bfqq->wr_cur_max_time = bfq_wr_duration(bfqd); + bfqq->last_wr_start_finish = bfqq->wr_start_at_switch_to_srt; +} + static void bfq_bfqq_resume_state(struct bfq_queue *bfqq, struct bfq_data *bfqd, struct bfq_io_cq *bic, bool bfq_already_existing) @@ -750,10 +789,16 @@ bfq_bfqq_resume_state(struct bfq_queue *bfqq, struct bfq_data *bfqd, if (bfqq->wr_coeff > 1 && (bfq_bfqq_in_large_burst(bfqq) || time_is_before_jiffies(bfqq->last_wr_start_finish + bfqq->wr_cur_max_time))) { - bfq_log_bfqq(bfqq->bfqd, bfqq, - "resume state: switching off wr"); - - bfqq->wr_coeff = 1; + if (bfqq->wr_cur_max_time == bfqd->bfq_wr_rt_max_time && + !bfq_bfqq_in_large_burst(bfqq) && + time_is_after_eq_jiffies(bfqq->wr_start_at_switch_to_srt + + bfq_wr_duration(bfqd))) { + switch_back_to_interactive_wr(bfqq, bfqd); + } else { + bfqq->wr_coeff = 1; + bfq_log_bfqq(bfqq->bfqd, bfqq, + "resume state: switching off wr"); + } } /* make sure weight will be updated, however we got here */ @@ -1173,33 +1218,22 @@ static bool bfq_bfqq_update_budg_for_activation(struct bfq_data *bfqd, return wr_or_deserves_wr; } -static unsigned int bfq_wr_duration(struct bfq_data *bfqd) +/* + * Return the farthest future time instant according to jiffies + * macros. + */ +static unsigned long bfq_greatest_from_now(void) { - u64 dur; - - if (bfqd->bfq_wr_max_time > 0) - return bfqd->bfq_wr_max_time; - - dur = bfqd->RT_prod; - do_div(dur, bfqd->peak_rate); - - /* - * Limit duration between 3 and 13 seconds. Tests show that - * higher values than 13 seconds often yield the opposite of - * the desired result, i.e., worsen responsiveness by letting - * non-interactive and non-soft-real-time applications - * preserve weight raising for a too long time interval. - * - * On the other end, lower values than 3 seconds make it - * difficult for most interactive tasks to complete their jobs - * before weight-raising finishes. - */ - if (dur > msecs_to_jiffies(13000)) - dur = msecs_to_jiffies(13000); - else if (dur < msecs_to_jiffies(3000)) - dur = msecs_to_jiffies(3000); + return jiffies + MAX_JIFFY_OFFSET; +} - return dur; +/* + * Return the farthest past time instant according to jiffies + * macros. + */ +static unsigned long bfq_smallest_from_now(void) +{ + return jiffies - MAX_JIFFY_OFFSET; } static void bfq_update_bfqq_wr_on_rq_arrival(struct bfq_data *bfqd, @@ -1216,7 +1250,19 @@ static void bfq_update_bfqq_wr_on_rq_arrival(struct bfq_data *bfqd, bfqq->wr_coeff = bfqd->bfq_wr_coeff; bfqq->wr_cur_max_time = bfq_wr_duration(bfqd); } else { - bfqq->wr_start_at_switch_to_srt = jiffies; + /* + * No interactive weight raising in progress + * here: assign minus infinity to + * wr_start_at_switch_to_srt, to make sure + * that, at the end of the soft-real-time + * weight raising periods that is starting + * now, no interactive weight-raising period + * may be wrongly considered as still in + * progress (and thus actually started by + * mistake). + */ + bfqq->wr_start_at_switch_to_srt = + bfq_smallest_from_now(); bfqq->wr_coeff = bfqd->bfq_wr_coeff * BFQ_SOFTRT_WEIGHT_FACTOR; bfqq->wr_cur_max_time = @@ -2016,10 +2062,27 @@ static void bfq_bfqq_save_state(struct bfq_queue *bfqq) bic->saved_IO_bound = bfq_bfqq_IO_bound(bfqq); bic->saved_in_large_burst = bfq_bfqq_in_large_burst(bfqq); bic->was_in_burst_list = !hlist_unhashed(&bfqq->burst_list_node); - bic->saved_wr_coeff = bfqq->wr_coeff; - bic->saved_wr_start_at_switch_to_srt = bfqq->wr_start_at_switch_to_srt; - bic->saved_last_wr_start_finish = bfqq->last_wr_start_finish; - bic->saved_wr_cur_max_time = bfqq->wr_cur_max_time; + if (unlikely(bfq_bfqq_just_created(bfqq) && + !bfq_bfqq_in_large_burst(bfqq))) { + /* + * bfqq being merged right after being created: bfqq + * would have deserved interactive weight raising, but + * did not make it to be set in a weight-raised state, + * because of this early merge. Store directly the + * weight-raising state that would have been assigned + * to bfqq, so that to avoid that bfqq unjustly fails + * to enjoy weight raising if split soon. + */ + bic->saved_wr_coeff = bfqq->bfqd->bfq_wr_coeff; + bic->saved_wr_cur_max_time = bfq_wr_duration(bfqq->bfqd); + bic->saved_last_wr_start_finish = jiffies; + } else { + bic->saved_wr_coeff = bfqq->wr_coeff; + bic->saved_wr_start_at_switch_to_srt = + bfqq->wr_start_at_switch_to_srt; + bic->saved_last_wr_start_finish = bfqq->last_wr_start_finish; + bic->saved_wr_cur_max_time = bfqq->wr_cur_max_time; + } } static void @@ -2897,24 +2960,6 @@ static unsigned long bfq_bfqq_softrt_next_start(struct bfq_data *bfqd, jiffies + nsecs_to_jiffies(bfqq->bfqd->bfq_slice_idle) + 4); } -/* - * Return the farthest future time instant according to jiffies - * macros. - */ -static unsigned long bfq_greatest_from_now(void) -{ - return jiffies + MAX_JIFFY_OFFSET; -} - -/* - * Return the farthest past time instant according to jiffies - * macros. - */ -static unsigned long bfq_smallest_from_now(void) -{ - return jiffies - MAX_JIFFY_OFFSET; -} - /** * bfq_bfqq_expire - expire a queue. * @bfqd: device owning the queue. @@ -3489,11 +3534,7 @@ static void bfq_update_wr_data(struct bfq_data *bfqd, struct bfq_queue *bfqq) bfq_wr_duration(bfqd))) bfq_bfqq_end_wr(bfqq); else { - /* switch back to interactive wr */ - bfqq->wr_coeff = bfqd->bfq_wr_coeff; - bfqq->wr_cur_max_time = bfq_wr_duration(bfqd); - bfqq->last_wr_start_finish = - bfqq->wr_start_at_switch_to_srt; + switch_back_to_interactive_wr(bfqq, bfqd); bfqq->entity.prio_changed = 1; } } @@ -3685,16 +3726,37 @@ void bfq_put_queue(struct bfq_queue *bfqq) if (bfqq->ref) return; - if (bfq_bfqq_sync(bfqq)) + if (!hlist_unhashed(&bfqq->burst_list_node)) { + hlist_del_init(&bfqq->burst_list_node); /* - * The fact that this queue is being destroyed does not - * invalidate the fact that this queue may have been - * activated during the current burst. As a consequence, - * although the queue does not exist anymore, and hence - * needs to be removed from the burst list if there, - * the burst size has not to be decremented. + * Decrement also burst size after the removal, if the + * process associated with bfqq is exiting, and thus + * does not contribute to the burst any longer. This + * decrement helps filter out false positives of large + * bursts, when some short-lived process (often due to + * the execution of commands by some service) happens + * to start and exit while a complex application is + * starting, and thus spawning several processes that + * do I/O (and that *must not* be treated as a large + * burst, see comments on bfq_handle_burst). + * + * In particular, the decrement is performed only if: + * 1) bfqq is not a merged queue, because, if it is, + * then this free of bfqq is not triggered by the exit + * of the process bfqq is associated with, but exactly + * by the fact that bfqq has just been merged. + * 2) burst_size is greater than 0, to handle + * unbalanced decrements. Unbalanced decrements may + * happen in te following case: bfqq is inserted into + * the current burst list--without incrementing + * bust_size--because of a split, but the current + * burst list is not the burst list bfqq belonged to + * (see comments on the case of a split in + * bfq_set_request). */ - hlist_del_init(&bfqq->burst_list_node); + if (bfqq->bic && bfqq->bfqd->burst_size > 0) + bfqq->bfqd->burst_size--; + } kmem_cache_free(bfq_pool, bfqq); #ifdef CONFIG_BFQ_GROUP_IOSCHED @@ -4127,7 +4189,6 @@ static void __bfq_insert_request(struct bfq_data *bfqd, struct request *rq) new_bfqq->allocated++; bfqq->allocated--; new_bfqq->ref++; - bfq_clear_bfqq_just_created(bfqq); /* * If the bic associated with the process * issuing this request still points to bfqq @@ -4139,6 +4200,8 @@ static void __bfq_insert_request(struct bfq_data *bfqd, struct request *rq) if (bic_to_bfqq(RQ_BIC(rq), 1) == bfqq) bfq_merge_bfqqs(bfqd, RQ_BIC(rq), bfqq, new_bfqq); + + bfq_clear_bfqq_just_created(bfqq); /* * rq is about to be enqueued into new_bfqq, * release rq reference on bfqq @@ -4424,6 +4487,34 @@ static struct bfq_queue *bfq_get_bfqq_handle_split(struct bfq_data *bfqd, else { bfq_clear_bfqq_in_large_burst(bfqq); if (bic->was_in_burst_list) + /* + * If bfqq was in the current + * burst list before being + * merged, then we have to add + * it back. And we do not need + * to increase burst_size, as + * we did not decrement + * burst_size when we removed + * bfqq from the burst list as + * a consequence of a merge + * (see comments in + * bfq_put_queue). In this + * respect, it would be rather + * costly to know whether the + * current burst list is still + * the same burst list from + * which bfqq was removed on + * the merge. To avoid this + * cost, if bfqq was in a + * burst list, then we add + * bfqq to the current burst + * list without any further + * check. This can cause + * inappropriate insertions, + * but rarely enough to not + * harm the detection of large + * bursts significantly. + */ hlist_add_head(&bfqq->burst_list_node, &bfqd->burst_list); } @@ -4775,7 +4866,7 @@ static int bfq_init_queue(struct request_queue *q, struct elevator_type *e) bfq_init_root_group(bfqd->root_group, bfqd); bfq_init_entity(&bfqd->oom_bfqq.entity, bfqd->root_group); - + wbt_disable_default(q); return 0; out_free: diff --git a/block/bio-integrity.c b/block/bio-integrity.c index 5df3290..23b42e8 100644 --- a/block/bio-integrity.c +++ b/block/bio-integrity.c @@ -485,11 +485,8 @@ EXPORT_SYMBOL(bioset_integrity_create); void bioset_integrity_free(struct bio_set *bs) { - if (bs->bio_integrity_pool) - mempool_destroy(bs->bio_integrity_pool); - - if (bs->bvec_integrity_pool) - mempool_destroy(bs->bvec_integrity_pool); + mempool_destroy(bs->bio_integrity_pool); + mempool_destroy(bs->bvec_integrity_pool); } EXPORT_SYMBOL(bioset_integrity_free); diff --git a/block/bio.c b/block/bio.c index cc60213..b94a802 100644 --- a/block/bio.c +++ b/block/bio.c @@ -400,7 +400,7 @@ static void punt_bios_to_rescuer(struct bio_set *bs) /** * bio_alloc_bioset - allocate a bio for I/O - * @gfp_mask: the GFP_ mask given to the slab allocator + * @gfp_mask: the GFP_* mask given to the slab allocator * @nr_iovecs: number of iovecs to pre-allocate * @bs: the bio_set to allocate from. * @@ -1931,11 +1931,8 @@ void bioset_free(struct bio_set *bs) if (bs->rescue_workqueue) destroy_workqueue(bs->rescue_workqueue); - if (bs->bio_pool) - mempool_destroy(bs->bio_pool); - - if (bs->bvec_pool) - mempool_destroy(bs->bvec_pool); + mempool_destroy(bs->bio_pool); + mempool_destroy(bs->bvec_pool); bioset_integrity_free(bs); bio_put_slab(bs); @@ -2036,37 +2033,6 @@ int bio_associate_blkcg(struct bio *bio, struct cgroup_subsys_state *blkcg_css) EXPORT_SYMBOL_GPL(bio_associate_blkcg); /** - * bio_associate_current - associate a bio with %current - * @bio: target bio - * - * Associate @bio with %current if it hasn't been associated yet. Block - * layer will treat @bio as if it were issued by %current no matter which - * task actually issues it. - * - * This function takes an extra reference of @task's io_context and blkcg - * which will be put when @bio is released. The caller must own @bio, - * ensure %current->io_context exists, and is responsible for synchronizing - * calls to this function. - */ -int bio_associate_current(struct bio *bio) -{ - struct io_context *ioc; - - if (bio->bi_css) - return -EBUSY; - - ioc = current->io_context; - if (!ioc) - return -ENOENT; - - get_io_context_active(ioc); - bio->bi_ioc = ioc; - bio->bi_css = task_get_css(current, io_cgrp_id); - return 0; -} -EXPORT_SYMBOL_GPL(bio_associate_current); - -/** * bio_disassociate_task - undo bio_associate_current() * @bio: target bio */ diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c index d3f56ba..4117524 100644 --- a/block/blk-cgroup.c +++ b/block/blk-cgroup.c @@ -1419,6 +1419,11 @@ int blkcg_policy_register(struct blkcg_policy *pol) if (i >= BLKCG_MAX_POLS) goto err_unlock; + /* Make sure cpd/pd_alloc_fn and cpd/pd_free_fn in pairs */ + if ((!pol->cpd_alloc_fn ^ !pol->cpd_free_fn) || + (!pol->pd_alloc_fn ^ !pol->pd_free_fn)) + goto err_unlock; + /* register @pol */ pol->plid = i; blkcg_policy[pol->plid] = pol; @@ -1452,7 +1457,7 @@ int blkcg_policy_register(struct blkcg_policy *pol) return 0; err_free_cpds: - if (pol->cpd_alloc_fn) { + if (pol->cpd_free_fn) { list_for_each_entry(blkcg, &all_blkcgs, all_blkcgs_node) { if (blkcg->cpd[pol->plid]) { pol->cpd_free_fn(blkcg->cpd[pol->plid]); @@ -1492,7 +1497,7 @@ void blkcg_policy_unregister(struct blkcg_policy *pol) /* remove cpds and unregister */ mutex_lock(&blkcg_pol_mutex); - if (pol->cpd_alloc_fn) { + if (pol->cpd_free_fn) { list_for_each_entry(blkcg, &all_blkcgs, all_blkcgs_node) { if (blkcg->cpd[pol->plid]) { pol->cpd_free_fn(blkcg->cpd[pol->plid]); diff --git a/block/blk-core.c b/block/blk-core.c index 048be4a..7c54c19 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -333,11 +333,13 @@ EXPORT_SYMBOL(blk_stop_queue); void blk_sync_queue(struct request_queue *q) { del_timer_sync(&q->timeout); + cancel_work_sync(&q->timeout_work); if (q->mq_ops) { struct blk_mq_hw_ctx *hctx; int i; + cancel_delayed_work_sync(&q->requeue_work); queue_for_each_hw_ctx(q, hctx, i) cancel_delayed_work_sync(&hctx->run_work); } else { @@ -347,6 +349,37 @@ void blk_sync_queue(struct request_queue *q) EXPORT_SYMBOL(blk_sync_queue); /** + * blk_set_preempt_only - set QUEUE_FLAG_PREEMPT_ONLY + * @q: request queue pointer + * + * Returns the previous value of the PREEMPT_ONLY flag - 0 if the flag was not + * set and 1 if the flag was already set. + */ +int blk_set_preempt_only(struct request_queue *q) +{ + unsigned long flags; + int res; + + spin_lock_irqsave(q->queue_lock, flags); + res = queue_flag_test_and_set(QUEUE_FLAG_PREEMPT_ONLY, q); + spin_unlock_irqrestore(q->queue_lock, flags); + + return res; +} +EXPORT_SYMBOL_GPL(blk_set_preempt_only); + +void blk_clear_preempt_only(struct request_queue *q) +{ + unsigned long flags; + + spin_lock_irqsave(q->queue_lock, flags); + queue_flag_clear(QUEUE_FLAG_PREEMPT_ONLY, q); + wake_up_all(&q->mq_freeze_wq); + spin_unlock_irqrestore(q->queue_lock, flags); +} +EXPORT_SYMBOL_GPL(blk_clear_preempt_only); + +/** * __blk_run_queue_uncond - run a queue whether or not it has been stopped * @q: The queue to run * @@ -610,6 +643,9 @@ void blk_set_queue_dying(struct request_queue *q) } spin_unlock_irq(q->queue_lock); } + + /* Make blk_queue_enter() reexamine the DYING flag. */ + wake_up_all(&q->mq_freeze_wq); } EXPORT_SYMBOL_GPL(blk_set_queue_dying); @@ -718,7 +754,7 @@ static void free_request_size(void *element, void *data) int blk_init_rl(struct request_list *rl, struct request_queue *q, gfp_t gfp_mask) { - if (unlikely(rl->rq_pool)) + if (unlikely(rl->rq_pool) || q->mq_ops) return 0; rl->q = q; @@ -760,15 +796,38 @@ struct request_queue *blk_alloc_queue(gfp_t gfp_mask) } EXPORT_SYMBOL(blk_alloc_queue); -int blk_queue_enter(struct request_queue *q, bool nowait) +/** + * blk_queue_enter() - try to increase q->q_usage_counter + * @q: request queue pointer + * @flags: BLK_MQ_REQ_NOWAIT and/or BLK_MQ_REQ_PREEMPT + */ +int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags) { + const bool preempt = flags & BLK_MQ_REQ_PREEMPT; + while (true) { + bool success = false; int ret; - if (percpu_ref_tryget_live(&q->q_usage_counter)) + rcu_read_lock_sched(); + if (percpu_ref_tryget_live(&q->q_usage_counter)) { + /* + * The code that sets the PREEMPT_ONLY flag is + * responsible for ensuring that that flag is globally + * visible before the queue is unfrozen. + */ + if (preempt || !blk_queue_preempt_only(q)) { + success = true; + } else { + percpu_ref_put(&q->q_usage_counter); + } + } + rcu_read_unlock_sched(); + + if (success) return 0; - if (nowait) + if (flags & BLK_MQ_REQ_NOWAIT) return -EBUSY; /* @@ -781,7 +840,8 @@ int blk_queue_enter(struct request_queue *q, bool nowait) smp_rmb(); ret = wait_event_interruptible(q->mq_freeze_wq, - !atomic_read(&q->mq_freeze_depth) || + (atomic_read(&q->mq_freeze_depth) == 0 && + (preempt || !blk_queue_preempt_only(q))) || blk_queue_dying(q)); if (blk_queue_dying(q)) return -ENODEV; @@ -844,6 +904,7 @@ struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id) setup_timer(&q->backing_dev_info->laptop_mode_wb_timer, laptop_mode_timer_fn, (unsigned long) q); setup_timer(&q->timeout, blk_rq_timed_out_timer, (unsigned long) q); + INIT_WORK(&q->timeout_work, NULL); INIT_LIST_HEAD(&q->queue_head); INIT_LIST_HEAD(&q->timeout_list); INIT_LIST_HEAD(&q->icq_list); @@ -1154,7 +1215,7 @@ int blk_update_nr_requests(struct request_queue *q, unsigned int nr) * @rl: request list to allocate from * @op: operation and flags * @bio: bio to allocate request for (can be %NULL) - * @gfp_mask: allocation mask + * @flags: BLQ_MQ_REQ_* flags * * Get a free request from @q. This function may fail under memory * pressure or if @q is dead. @@ -1164,7 +1225,7 @@ int blk_update_nr_requests(struct request_queue *q, unsigned int nr) * Returns request pointer on success, with @q->queue_lock *not held*. */ static struct request *__get_request(struct request_list *rl, unsigned int op, - struct bio *bio, gfp_t gfp_mask) + struct bio *bio, blk_mq_req_flags_t flags) { struct request_queue *q = rl->q; struct request *rq; @@ -1173,6 +1234,8 @@ static struct request *__get_request(struct request_list *rl, unsigned int op, struct io_cq *icq = NULL; const bool is_sync = op_is_sync(op); int may_queue; + gfp_t gfp_mask = flags & BLK_MQ_REQ_NOWAIT ? GFP_ATOMIC : + __GFP_DIRECT_RECLAIM; req_flags_t rq_flags = RQF_ALLOCED; lockdep_assert_held(q->queue_lock); @@ -1255,6 +1318,8 @@ static struct request *__get_request(struct request_list *rl, unsigned int op, blk_rq_set_rl(rq, rl); rq->cmd_flags = op; rq->rq_flags = rq_flags; + if (flags & BLK_MQ_REQ_PREEMPT) + rq->rq_flags |= RQF_PREEMPT; /* init elvpriv */ if (rq_flags & RQF_ELVPRIV) { @@ -1333,7 +1398,7 @@ rq_starved: * @q: request_queue to allocate request from * @op: operation and flags * @bio: bio to allocate request for (can be %NULL) - * @gfp_mask: allocation mask + * @flags: BLK_MQ_REQ_* flags. * * Get a free request from @q. If %__GFP_DIRECT_RECLAIM is set in @gfp_mask, * this function keeps retrying under memory pressure and fails iff @q is dead. @@ -1343,7 +1408,7 @@ rq_starved: * Returns request pointer on success, with @q->queue_lock *not held*. */ static struct request *get_request(struct request_queue *q, unsigned int op, - struct bio *bio, gfp_t gfp_mask) + struct bio *bio, blk_mq_req_flags_t flags) { const bool is_sync = op_is_sync(op); DEFINE_WAIT(wait); @@ -1355,7 +1420,7 @@ static struct request *get_request(struct request_queue *q, unsigned int op, rl = blk_get_rl(q, bio); /* transferred to @rq on success */ retry: - rq = __get_request(rl, op, bio, gfp_mask); + rq = __get_request(rl, op, bio, flags); if (!IS_ERR(rq)) return rq; @@ -1364,7 +1429,7 @@ retry: return ERR_PTR(-EAGAIN); } - if (!gfpflags_allow_blocking(gfp_mask) || unlikely(blk_queue_dying(q))) { + if ((flags & BLK_MQ_REQ_NOWAIT) || unlikely(blk_queue_dying(q))) { blk_put_rl(rl); return rq; } @@ -1391,20 +1456,28 @@ retry: goto retry; } +/* flags: BLK_MQ_REQ_PREEMPT and/or BLK_MQ_REQ_NOWAIT. */ static struct request *blk_old_get_request(struct request_queue *q, - unsigned int op, gfp_t gfp_mask) + unsigned int op, blk_mq_req_flags_t flags) { struct request *rq; + gfp_t gfp_mask = flags & BLK_MQ_REQ_NOWAIT ? GFP_ATOMIC : + __GFP_DIRECT_RECLAIM; + int ret = 0; WARN_ON_ONCE(q->mq_ops); /* create ioc upfront */ create_io_context(gfp_mask, q->node); + ret = blk_queue_enter(q, flags); + if (ret) + return ERR_PTR(ret); spin_lock_irq(q->queue_lock); - rq = get_request(q, op, NULL, gfp_mask); + rq = get_request(q, op, NULL, flags); if (IS_ERR(rq)) { spin_unlock_irq(q->queue_lock); + blk_queue_exit(q); return rq; } @@ -1415,25 +1488,40 @@ static struct request *blk_old_get_request(struct request_queue *q, return rq; } -struct request *blk_get_request(struct request_queue *q, unsigned int op, - gfp_t gfp_mask) +/** + * blk_get_request_flags - allocate a request + * @q: request queue to allocate a request for + * @op: operation (REQ_OP_*) and REQ_* flags, e.g. REQ_SYNC. + * @flags: BLK_MQ_REQ_* flags, e.g. BLK_MQ_REQ_NOWAIT. + */ +struct request *blk_get_request_flags(struct request_queue *q, unsigned int op, + blk_mq_req_flags_t flags) { struct request *req; + WARN_ON_ONCE(op & REQ_NOWAIT); + WARN_ON_ONCE(flags & ~(BLK_MQ_REQ_NOWAIT | BLK_MQ_REQ_PREEMPT)); + if (q->mq_ops) { - req = blk_mq_alloc_request(q, op, - (gfp_mask & __GFP_DIRECT_RECLAIM) ? - 0 : BLK_MQ_REQ_NOWAIT); + req = blk_mq_alloc_request(q, op, flags); if (!IS_ERR(req) && q->mq_ops->initialize_rq_fn) q->mq_ops->initialize_rq_fn(req); } else { - req = blk_old_get_request(q, op, gfp_mask); + req = blk_old_get_request(q, op, flags); if (!IS_ERR(req) && q->initialize_rq_fn) q->initialize_rq_fn(req); } return req; } +EXPORT_SYMBOL(blk_get_request_flags); + +struct request *blk_get_request(struct request_queue *q, unsigned int op, + gfp_t gfp_mask) +{ + return blk_get_request_flags(q, op, gfp_mask & __GFP_DIRECT_RECLAIM ? + 0 : BLK_MQ_REQ_NOWAIT); +} EXPORT_SYMBOL(blk_get_request); /** @@ -1576,6 +1664,7 @@ void __blk_put_request(struct request_queue *q, struct request *req) blk_free_request(rl, req); freed_request(rl, sync, rq_flags); blk_put_rl(rl); + blk_queue_exit(q); } } EXPORT_SYMBOL_GPL(__blk_put_request); @@ -1857,8 +1946,10 @@ get_rq: * Grab a free request. This is might sleep but can not fail. * Returns with the queue unlocked. */ - req = get_request(q, bio->bi_opf, bio, GFP_NOIO); + blk_queue_enter_live(q); + req = get_request(q, bio->bi_opf, bio, 0); if (IS_ERR(req)) { + blk_queue_exit(q); __wbt_done(q->rq_wb, wb_acct); if (PTR_ERR(req) == -ENOMEM) bio->bi_status = BLK_STS_RESOURCE; @@ -2200,8 +2291,10 @@ blk_qc_t generic_make_request(struct bio *bio) current->bio_list = bio_list_on_stack; do { struct request_queue *q = bio->bi_disk->queue; + blk_mq_req_flags_t flags = bio->bi_opf & REQ_NOWAIT ? + BLK_MQ_REQ_NOWAIT : 0; - if (likely(blk_queue_enter(q, bio->bi_opf & REQ_NOWAIT) == 0)) { + if (likely(blk_queue_enter(q, flags) == 0)) { struct bio_list lower, same; /* Create a fresh bio_list for all subordinate requests */ @@ -2242,6 +2335,40 @@ out: EXPORT_SYMBOL(generic_make_request); /** + * direct_make_request - hand a buffer directly to its device driver for I/O + * @bio: The bio describing the location in memory and on the device. + * + * This function behaves like generic_make_request(), but does not protect + * against recursion. Must only be used if the called driver is known + * to not call generic_make_request (or direct_make_request) again from + * its make_request function. (Calling direct_make_request again from + * a workqueue is perfectly fine as that doesn't recurse). + */ +blk_qc_t direct_make_request(struct bio *bio) +{ + struct request_queue *q = bio->bi_disk->queue; + bool nowait = bio->bi_opf & REQ_NOWAIT; + blk_qc_t ret; + + if (!generic_make_request_checks(bio)) + return BLK_QC_T_NONE; + + if (unlikely(blk_queue_enter(q, nowait ? BLK_MQ_REQ_NOWAIT : 0))) { + if (nowait && !blk_queue_dying(q)) + bio->bi_status = BLK_STS_AGAIN; + else + bio->bi_status = BLK_STS_IOERR; + bio_endio(bio); + return BLK_QC_T_NONE; + } + + ret = q->make_request_fn(q, bio); + blk_queue_exit(q); + return ret; +} +EXPORT_SYMBOL_GPL(direct_make_request); + +/** * submit_bio - submit a bio to the block device layer for I/O * @bio: The &struct bio which describes the I/O * @@ -2285,6 +2412,17 @@ blk_qc_t submit_bio(struct bio *bio) } EXPORT_SYMBOL(submit_bio); +bool blk_poll(struct request_queue *q, blk_qc_t cookie) +{ + if (!q->poll_fn || !blk_qc_t_valid(cookie)) + return false; + + if (current->plug) + blk_flush_plug_list(current->plug, false); + return q->poll_fn(q, cookie); +} +EXPORT_SYMBOL_GPL(blk_poll); + /** * blk_cloned_rq_check_limits - Helper function to check a cloned request * for new the queue limits @@ -2350,7 +2488,7 @@ blk_status_t blk_insert_cloned_request(struct request_queue *q, struct request * * bypass a potential scheduler on the bottom device for * insert. */ - blk_mq_request_bypass_insert(rq); + blk_mq_request_bypass_insert(rq, true); return BLK_STS_OK; } @@ -2464,20 +2602,22 @@ void blk_account_io_done(struct request *req) * Don't process normal requests when queue is suspended * or in the process of suspending/resuming */ -static struct request *blk_pm_peek_request(struct request_queue *q, - struct request *rq) +static bool blk_pm_allow_request(struct request *rq) { - if (q->dev && (q->rpm_status == RPM_SUSPENDED || - (q->rpm_status != RPM_ACTIVE && !(rq->rq_flags & RQF_PM)))) - return NULL; - else - return rq; + switch (rq->q->rpm_status) { + case RPM_RESUMING: + case RPM_SUSPENDING: + return rq->rq_flags & RQF_PM; + case RPM_SUSPENDED: + return false; + } + + return true; } #else -static inline struct request *blk_pm_peek_request(struct request_queue *q, - struct request *rq) +static bool blk_pm_allow_request(struct request *rq) { - return rq; + return true; } #endif @@ -2517,6 +2657,48 @@ void blk_account_io_start(struct request *rq, bool new_io) part_stat_unlock(); } +static struct request *elv_next_request(struct request_queue *q) +{ + struct request *rq; + struct blk_flush_queue *fq = blk_get_flush_queue(q, NULL); + + WARN_ON_ONCE(q->mq_ops); + + while (1) { + list_for_each_entry(rq, &q->queue_head, queuelist) { + if (blk_pm_allow_request(rq)) + return rq; + + if (rq->rq_flags & RQF_SOFTBARRIER) + break; + } + + /* + * Flush request is running and flush request isn't queueable + * in the drive, we can hold the queue till flush request is + * finished. Even we don't do this, driver can't dispatch next + * requests and will requeue them. And this can improve + * throughput too. For example, we have request flush1, write1, + * flush 2. flush1 is dispatched, then queue is hold, write1 + * isn't inserted to queue. After flush1 is finished, flush2 + * will be dispatched. Since disk cache is already clean, + * flush2 will be finished very soon, so looks like flush2 is + * folded to flush1. + * Since the queue is hold, a flag is set to indicate the queue + * should be restarted later. Please see flush_end_io() for + * details. + */ + if (fq->flush_pending_idx != fq->flush_running_idx && + !queue_flush_queueable(q)) { + fq->flush_queue_delayed = 1; + return NULL; + } + if (unlikely(blk_queue_bypass(q)) || + !q->elevator->type->ops.sq.elevator_dispatch_fn(q, 0)) + return NULL; + } +} + /** * blk_peek_request - peek at the top of a request queue * @q: request queue to peek at @@ -2538,12 +2720,7 @@ struct request *blk_peek_request(struct request_queue *q) lockdep_assert_held(q->queue_lock); WARN_ON_ONCE(q->mq_ops); - while ((rq = __elv_next_request(q)) != NULL) { - - rq = blk_pm_peek_request(q, rq); - if (!rq) - break; - + while ((rq = elv_next_request(q)) != NULL) { if (!(rq->rq_flags & RQF_STARTED)) { /* * This is the first time the device driver @@ -2695,6 +2872,27 @@ struct request *blk_fetch_request(struct request_queue *q) } EXPORT_SYMBOL(blk_fetch_request); +/* + * Steal bios from a request and add them to a bio list. + * The request must not have been partially completed before. + */ +void blk_steal_bios(struct bio_list *list, struct request *rq) +{ + if (rq->bio) { + if (list->tail) + list->tail->bi_next = rq->bio; + else + list->head = rq->bio; + list->tail = rq->biotail; + + rq->bio = NULL; + rq->biotail = NULL; + } + + rq->__data_len = 0; +} +EXPORT_SYMBOL_GPL(blk_steal_bios); + /** * blk_update_request - Special helper function for request stacking drivers * @req: the request being processed diff --git a/block/blk-flush.c b/block/blk-flush.c index 4938bec..f171706 100644 --- a/block/blk-flush.c +++ b/block/blk-flush.c @@ -231,8 +231,13 @@ static void flush_end_io(struct request *flush_rq, blk_status_t error) /* release the tag's ownership to the req cloned from */ spin_lock_irqsave(&fq->mq_flush_lock, flags); hctx = blk_mq_map_queue(q, flush_rq->mq_ctx->cpu); - blk_mq_tag_set_rq(hctx, flush_rq->tag, fq->orig_rq); - flush_rq->tag = -1; + if (!q->elevator) { + blk_mq_tag_set_rq(hctx, flush_rq->tag, fq->orig_rq); + flush_rq->tag = -1; + } else { + blk_mq_put_driver_tag_hctx(hctx, flush_rq); + flush_rq->internal_tag = -1; + } } running = &fq->flush_queue[fq->flush_running_idx]; @@ -318,19 +323,26 @@ static bool blk_kick_flush(struct request_queue *q, struct blk_flush_queue *fq) blk_rq_init(q, flush_rq); /* - * Borrow tag from the first request since they can't - * be in flight at the same time. And acquire the tag's - * ownership for flush req. + * In case of none scheduler, borrow tag from the first request + * since they can't be in flight at the same time. And acquire + * the tag's ownership for flush req. + * + * In case of IO scheduler, flush rq need to borrow scheduler tag + * just for cheating put/get driver tag. */ if (q->mq_ops) { struct blk_mq_hw_ctx *hctx; flush_rq->mq_ctx = first_rq->mq_ctx; - flush_rq->tag = first_rq->tag; - fq->orig_rq = first_rq; - hctx = blk_mq_map_queue(q, first_rq->mq_ctx->cpu); - blk_mq_tag_set_rq(hctx, first_rq->tag, flush_rq); + if (!q->elevator) { + fq->orig_rq = first_rq; + flush_rq->tag = first_rq->tag; + hctx = blk_mq_map_queue(q, first_rq->mq_ctx->cpu); + blk_mq_tag_set_rq(hctx, first_rq->tag, flush_rq); + } else { + flush_rq->internal_tag = first_rq->internal_tag; + } } flush_rq->cmd_flags = REQ_OP_FLUSH | REQ_PREFLUSH; @@ -394,6 +406,11 @@ static void mq_flush_data_end_io(struct request *rq, blk_status_t error) hctx = blk_mq_map_queue(q, ctx->cpu); + if (q->elevator) { + WARN_ON(rq->tag < 0); + blk_mq_put_driver_tag_hctx(hctx, rq); + } + /* * After populating an empty queue, kick it to avoid stall. Read * the comment in flush_end_io(). @@ -463,7 +480,7 @@ void blk_insert_flush(struct request *rq) if ((policy & REQ_FSEQ_DATA) && !(policy & (REQ_FSEQ_PREFLUSH | REQ_FSEQ_POSTFLUSH))) { if (q->mq_ops) - blk_mq_sched_insert_request(rq, false, true, false, false); + blk_mq_request_bypass_insert(rq, false); else list_add_tail(&rq->queuelist, &q->queue_head); return; diff --git a/block/blk-lib.c b/block/blk-lib.c index 63fb971..2bc544c 100644 --- a/block/blk-lib.c +++ b/block/blk-lib.c @@ -275,6 +275,40 @@ static unsigned int __blkdev_sectors_to_bio_pages(sector_t nr_sects) return min(pages, (sector_t)BIO_MAX_PAGES); } +static int __blkdev_issue_zero_pages(struct block_device *bdev, + sector_t sector, sector_t nr_sects, gfp_t gfp_mask, + struct bio **biop) +{ + struct request_queue *q = bdev_get_queue(bdev); + struct bio *bio = *biop; + int bi_size = 0; + unsigned int sz; + + if (!q) + return -ENXIO; + + while (nr_sects != 0) { + bio = next_bio(bio, __blkdev_sectors_to_bio_pages(nr_sects), + gfp_mask); + bio->bi_iter.bi_sector = sector; + bio_set_dev(bio, bdev); + bio_set_op_attrs(bio, REQ_OP_WRITE, 0); + + while (nr_sects != 0) { + sz = min((sector_t) PAGE_SIZE, nr_sects << 9); + bi_size = bio_add_page(bio, ZERO_PAGE(0), sz, 0); + nr_sects -= bi_size >> 9; + sector += bi_size >> 9; + if (bi_size < sz) + break; + } + cond_resched(); + } + + *biop = bio; + return 0; +} + /** * __blkdev_issue_zeroout - generate number of zero filed write bios * @bdev: blockdev to issue @@ -288,12 +322,6 @@ static unsigned int __blkdev_sectors_to_bio_pages(sector_t nr_sects) * Zero-fill a block range, either using hardware offload or by explicitly * writing zeroes to the device. * - * Note that this function may fail with -EOPNOTSUPP if the driver signals - * zeroing offload support, but the device fails to process the command (for - * some devices there is no non-destructive way to verify whether this - * operation is actually supported). In this case the caller should call - * retry the call to blkdev_issue_zeroout() and the fallback path will be used. - * * If a device is using logical block provisioning, the underlying space will * not be released if %flags contains BLKDEV_ZERO_NOUNMAP. * @@ -305,9 +333,6 @@ int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, unsigned flags) { int ret; - int bi_size = 0; - struct bio *bio = *biop; - unsigned int sz; sector_t bs_mask; bs_mask = (bdev_logical_block_size(bdev) >> 9) - 1; @@ -317,30 +342,10 @@ int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, ret = __blkdev_issue_write_zeroes(bdev, sector, nr_sects, gfp_mask, biop, flags); if (ret != -EOPNOTSUPP || (flags & BLKDEV_ZERO_NOFALLBACK)) - goto out; - - ret = 0; - while (nr_sects != 0) { - bio = next_bio(bio, __blkdev_sectors_to_bio_pages(nr_sects), - gfp_mask); - bio->bi_iter.bi_sector = sector; - bio_set_dev(bio, bdev); - bio_set_op_attrs(bio, REQ_OP_WRITE, 0); - - while (nr_sects != 0) { - sz = min((sector_t) PAGE_SIZE, nr_sects << 9); - bi_size = bio_add_page(bio, ZERO_PAGE(0), sz, 0); - nr_sects -= bi_size >> 9; - sector += bi_size >> 9; - if (bi_size < sz) - break; - } - cond_resched(); - } + return ret; - *biop = bio; -out: - return ret; + return __blkdev_issue_zero_pages(bdev, sector, nr_sects, gfp_mask, + biop); } EXPORT_SYMBOL(__blkdev_issue_zeroout); @@ -360,18 +365,49 @@ EXPORT_SYMBOL(__blkdev_issue_zeroout); int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector, sector_t nr_sects, gfp_t gfp_mask, unsigned flags) { - int ret; - struct bio *bio = NULL; + int ret = 0; + sector_t bs_mask; + struct bio *bio; struct blk_plug plug; + bool try_write_zeroes = !!bdev_write_zeroes_sectors(bdev); + bs_mask = (bdev_logical_block_size(bdev) >> 9) - 1; + if ((sector | nr_sects) & bs_mask) + return -EINVAL; + +retry: + bio = NULL; blk_start_plug(&plug); - ret = __blkdev_issue_zeroout(bdev, sector, nr_sects, gfp_mask, - &bio, flags); + if (try_write_zeroes) { + ret = __blkdev_issue_write_zeroes(bdev, sector, nr_sects, + gfp_mask, &bio, flags); + } else if (!(flags & BLKDEV_ZERO_NOFALLBACK)) { + ret = __blkdev_issue_zero_pages(bdev, sector, nr_sects, + gfp_mask, &bio); + } else { + /* No zeroing offload support */ + ret = -EOPNOTSUPP; + } if (ret == 0 && bio) { ret = submit_bio_wait(bio); bio_put(bio); } blk_finish_plug(&plug); + if (ret && try_write_zeroes) { + if (!(flags & BLKDEV_ZERO_NOFALLBACK)) { + try_write_zeroes = false; + goto retry; + } + if (!bdev_write_zeroes_sectors(bdev)) { + /* + * Zeroing offload support was indicated, but the + * device reported ILLEGAL REQUEST (for some devices + * there is no non-destructive way to verify whether + * WRITE ZEROES is actually supported). + */ + ret = -EOPNOTSUPP; + } + } return ret; } diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c index de294d7..b56a4f3 100644 --- a/block/blk-mq-debugfs.c +++ b/block/blk-mq-debugfs.c @@ -54,7 +54,6 @@ static const char *const blk_queue_flag_name[] = { QUEUE_FLAG_NAME(NOMERGES), QUEUE_FLAG_NAME(SAME_COMP), QUEUE_FLAG_NAME(FAIL_IO), - QUEUE_FLAG_NAME(STACKABLE), QUEUE_FLAG_NAME(NONROT), QUEUE_FLAG_NAME(IO_STAT), QUEUE_FLAG_NAME(DISCARD), @@ -75,6 +74,7 @@ static const char *const blk_queue_flag_name[] = { QUEUE_FLAG_NAME(REGISTERED), QUEUE_FLAG_NAME(SCSI_PASSTHROUGH), QUEUE_FLAG_NAME(QUIESCED), + QUEUE_FLAG_NAME(PREEMPT_ONLY), }; #undef QUEUE_FLAG_NAME @@ -180,7 +180,6 @@ static const char *const hctx_state_name[] = { HCTX_STATE_NAME(STOPPED), HCTX_STATE_NAME(TAG_ACTIVE), HCTX_STATE_NAME(SCHED_RESTART), - HCTX_STATE_NAME(TAG_WAITING), HCTX_STATE_NAME(START_ON_RUN), }; #undef HCTX_STATE_NAME diff --git a/block/blk-mq-sched.c b/block/blk-mq-sched.c index 4ab6943..c117bd8 100644 --- a/block/blk-mq-sched.c +++ b/block/blk-mq-sched.c @@ -81,20 +81,103 @@ static bool blk_mq_sched_restart_hctx(struct blk_mq_hw_ctx *hctx) } else clear_bit(BLK_MQ_S_SCHED_RESTART, &hctx->state); - if (blk_mq_hctx_has_pending(hctx)) { - blk_mq_run_hw_queue(hctx, true); - return true; - } + return blk_mq_run_hw_queue(hctx, true); +} - return false; +/* + * Only SCSI implements .get_budget and .put_budget, and SCSI restarts + * its queue by itself in its completion handler, so we don't need to + * restart queue if .get_budget() returns BLK_STS_NO_RESOURCE. + */ +static void blk_mq_do_dispatch_sched(struct blk_mq_hw_ctx *hctx) +{ + struct request_queue *q = hctx->queue; + struct elevator_queue *e = q->elevator; + LIST_HEAD(rq_list); + + do { + struct request *rq; + + if (e->type->ops.mq.has_work && + !e->type->ops.mq.has_work(hctx)) + break; + + if (!blk_mq_get_dispatch_budget(hctx)) + break; + + rq = e->type->ops.mq.dispatch_request(hctx); + if (!rq) { + blk_mq_put_dispatch_budget(hctx); + break; + } + + /* + * Now this rq owns the budget which has to be released + * if this rq won't be queued to driver via .queue_rq() + * in blk_mq_dispatch_rq_list(). + */ + list_add(&rq->queuelist, &rq_list); + } while (blk_mq_dispatch_rq_list(q, &rq_list, true)); } +static struct blk_mq_ctx *blk_mq_next_ctx(struct blk_mq_hw_ctx *hctx, + struct blk_mq_ctx *ctx) +{ + unsigned idx = ctx->index_hw; + + if (++idx == hctx->nr_ctx) + idx = 0; + + return hctx->ctxs[idx]; +} + +/* + * Only SCSI implements .get_budget and .put_budget, and SCSI restarts + * its queue by itself in its completion handler, so we don't need to + * restart queue if .get_budget() returns BLK_STS_NO_RESOURCE. + */ +static void blk_mq_do_dispatch_ctx(struct blk_mq_hw_ctx *hctx) +{ + struct request_queue *q = hctx->queue; + LIST_HEAD(rq_list); + struct blk_mq_ctx *ctx = READ_ONCE(hctx->dispatch_from); + + do { + struct request *rq; + + if (!sbitmap_any_bit_set(&hctx->ctx_map)) + break; + + if (!blk_mq_get_dispatch_budget(hctx)) + break; + + rq = blk_mq_dequeue_from_ctx(hctx, ctx); + if (!rq) { + blk_mq_put_dispatch_budget(hctx); + break; + } + + /* + * Now this rq owns the budget which has to be released + * if this rq won't be queued to driver via .queue_rq() + * in blk_mq_dispatch_rq_list(). + */ + list_add(&rq->queuelist, &rq_list); + + /* round robin for fair dispatch */ + ctx = blk_mq_next_ctx(hctx, rq->mq_ctx); + + } while (blk_mq_dispatch_rq_list(q, &rq_list, true)); + + WRITE_ONCE(hctx->dispatch_from, ctx); +} + +/* return true if hw queue need to be run again */ void blk_mq_sched_dispatch_requests(struct blk_mq_hw_ctx *hctx) { struct request_queue *q = hctx->queue; struct elevator_queue *e = q->elevator; const bool has_sched_dispatch = e && e->type->ops.mq.dispatch_request; - bool did_work = false; LIST_HEAD(rq_list); /* RCU or SRCU read lock is needed before checking quiesced flag */ @@ -122,29 +205,34 @@ void blk_mq_sched_dispatch_requests(struct blk_mq_hw_ctx *hctx) * scheduler, we can no longer merge or sort them. So it's best to * leave them there for as long as we can. Mark the hw queue as * needing a restart in that case. + * + * We want to dispatch from the scheduler if there was nothing + * on the dispatch list or we were able to dispatch from the + * dispatch list. */ if (!list_empty(&rq_list)) { blk_mq_sched_mark_restart_hctx(hctx); - did_work = blk_mq_dispatch_rq_list(q, &rq_list); - } else if (!has_sched_dispatch) { + if (blk_mq_dispatch_rq_list(q, &rq_list, false)) { + if (has_sched_dispatch) + blk_mq_do_dispatch_sched(hctx); + else + blk_mq_do_dispatch_ctx(hctx); + } + } else if (has_sched_dispatch) { + blk_mq_do_dispatch_sched(hctx); + } else if (q->mq_ops->get_budget) { + /* + * If we need to get budget before queuing request, we + * dequeue request one by one from sw queue for avoiding + * to mess up I/O merge when dispatch runs out of resource. + * + * TODO: get more budgets, and dequeue more requests in + * one time. + */ + blk_mq_do_dispatch_ctx(hctx); + } else { blk_mq_flush_busy_ctxs(hctx, &rq_list); - blk_mq_dispatch_rq_list(q, &rq_list); - } - - /* - * We want to dispatch from the scheduler if we had no work left - * on the dispatch list, OR if we did have work but weren't able - * to make progress. - */ - if (!did_work && has_sched_dispatch) { - do { - struct request *rq; - - rq = e->type->ops.mq.dispatch_request(hctx); - if (!rq) - break; - list_add(&rq->queuelist, &rq_list); - } while (blk_mq_dispatch_rq_list(q, &rq_list)); + blk_mq_dispatch_rq_list(q, &rq_list, false); } } @@ -260,21 +348,21 @@ void blk_mq_sched_request_inserted(struct request *rq) EXPORT_SYMBOL_GPL(blk_mq_sched_request_inserted); static bool blk_mq_sched_bypass_insert(struct blk_mq_hw_ctx *hctx, + bool has_sched, struct request *rq) { - if (rq->tag == -1) { - rq->rq_flags |= RQF_SORTED; - return false; + /* dispatch flush rq directly */ + if (rq->rq_flags & RQF_FLUSH_SEQ) { + spin_lock(&hctx->lock); + list_add(&rq->queuelist, &hctx->dispatch); + spin_unlock(&hctx->lock); + return true; } - /* - * If we already have a real request tag, send directly to - * the dispatch list. - */ - spin_lock(&hctx->lock); - list_add(&rq->queuelist, &hctx->dispatch); - spin_unlock(&hctx->lock); - return true; + if (has_sched) + rq->rq_flags |= RQF_SORTED; + + return false; } /** @@ -339,21 +427,6 @@ done: } } -/* - * Add flush/fua to the queue. If we fail getting a driver tag, then - * punt to the requeue list. Requeue will re-invoke us from a context - * that's safe to block from. - */ -static void blk_mq_sched_insert_flush(struct blk_mq_hw_ctx *hctx, - struct request *rq, bool can_block) -{ - if (blk_mq_get_driver_tag(rq, &hctx, can_block)) { - blk_insert_flush(rq); - blk_mq_run_hw_queue(hctx, true); - } else - blk_mq_add_to_requeue_list(rq, false, true); -} - void blk_mq_sched_insert_request(struct request *rq, bool at_head, bool run_queue, bool async, bool can_block) { @@ -362,12 +435,15 @@ void blk_mq_sched_insert_request(struct request *rq, bool at_head, struct blk_mq_ctx *ctx = rq->mq_ctx; struct blk_mq_hw_ctx *hctx = blk_mq_map_queue(q, ctx->cpu); - if (rq->tag == -1 && op_is_flush(rq->cmd_flags)) { - blk_mq_sched_insert_flush(hctx, rq, can_block); - return; + /* flush rq in flush machinery need to be dispatched directly */ + if (!(rq->rq_flags & RQF_FLUSH_SEQ) && op_is_flush(rq->cmd_flags)) { + blk_insert_flush(rq); + goto run; } - if (e && blk_mq_sched_bypass_insert(hctx, rq)) + WARN_ON(e && (rq->tag != -1)); + + if (blk_mq_sched_bypass_insert(hctx, !!e, rq)) goto run; if (e && e->type->ops.mq.insert_requests) { @@ -393,23 +469,6 @@ void blk_mq_sched_insert_requests(struct request_queue *q, struct blk_mq_hw_ctx *hctx = blk_mq_map_queue(q, ctx->cpu); struct elevator_queue *e = hctx->queue->elevator; - if (e) { - struct request *rq, *next; - - /* - * We bypass requests that already have a driver tag assigned, - * which should only be flushes. Flushes are only ever inserted - * as single requests, so we shouldn't ever hit the - * WARN_ON_ONCE() below (but let's handle it just in case). - */ - list_for_each_entry_safe(rq, next, list, queuelist) { - if (WARN_ON_ONCE(rq->tag != -1)) { - list_del_init(&rq->queuelist); - blk_mq_sched_bypass_insert(hctx, rq); - } - } - } - if (e && e->type->ops.mq.insert_requests) e->type->ops.mq.insert_requests(hctx, list, false); else diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c index 6714507..c81b40e 100644 --- a/block/blk-mq-tag.c +++ b/block/blk-mq-tag.c @@ -298,12 +298,12 @@ void blk_mq_tagset_busy_iter(struct blk_mq_tag_set *tagset, } EXPORT_SYMBOL(blk_mq_tagset_busy_iter); -int blk_mq_reinit_tagset(struct blk_mq_tag_set *set, - int (reinit_request)(void *, struct request *)) +int blk_mq_tagset_iter(struct blk_mq_tag_set *set, void *data, + int (fn)(void *, struct request *)) { int i, j, ret = 0; - if (WARN_ON_ONCE(!reinit_request)) + if (WARN_ON_ONCE(!fn)) goto out; for (i = 0; i < set->nr_hw_queues; i++) { @@ -316,8 +316,7 @@ int blk_mq_reinit_tagset(struct blk_mq_tag_set *set, if (!tags->static_rqs[j]) continue; - ret = reinit_request(set->driver_data, - tags->static_rqs[j]); + ret = fn(data, tags->static_rqs[j]); if (ret) goto out; } @@ -326,7 +325,7 @@ int blk_mq_reinit_tagset(struct blk_mq_tag_set *set, out: return ret; } -EXPORT_SYMBOL_GPL(blk_mq_reinit_tagset); +EXPORT_SYMBOL_GPL(blk_mq_tagset_iter); void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn, void *priv) diff --git a/block/blk-mq-tag.h b/block/blk-mq-tag.h index c190165..61deab0 100644 --- a/block/blk-mq-tag.h +++ b/block/blk-mq-tag.h @@ -45,13 +45,8 @@ static inline struct sbq_wait_state *bt_wait_ptr(struct sbitmap_queue *bt, } enum { - BLK_MQ_TAG_CACHE_MIN = 1, - BLK_MQ_TAG_CACHE_MAX = 64, -}; - -enum { BLK_MQ_TAG_FAIL = -1U, - BLK_MQ_TAG_MIN = BLK_MQ_TAG_CACHE_MIN, + BLK_MQ_TAG_MIN = 1, BLK_MQ_TAG_MAX = BLK_MQ_TAG_FAIL - 1, }; diff --git a/block/blk-mq.c b/block/blk-mq.c index 98a1860..b600463 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -37,6 +37,7 @@ #include "blk-wbt.h" #include "blk-mq-sched.h" +static bool blk_mq_poll(struct request_queue *q, blk_qc_t cookie); static void blk_mq_poll_stats_start(struct request_queue *q); static void blk_mq_poll_stats_fn(struct blk_stat_callback *cb); @@ -60,10 +61,10 @@ static int blk_mq_poll_stats_bkt(const struct request *rq) /* * Check if any of the ctx's have pending work in this hardware queue */ -bool blk_mq_hctx_has_pending(struct blk_mq_hw_ctx *hctx) +static bool blk_mq_hctx_has_pending(struct blk_mq_hw_ctx *hctx) { - return sbitmap_any_bit_set(&hctx->ctx_map) || - !list_empty_careful(&hctx->dispatch) || + return !list_empty_careful(&hctx->dispatch) || + sbitmap_any_bit_set(&hctx->ctx_map) || blk_mq_sched_has_work(hctx); } @@ -125,7 +126,8 @@ void blk_freeze_queue_start(struct request_queue *q) freeze_depth = atomic_inc_return(&q->mq_freeze_depth); if (freeze_depth == 1) { percpu_ref_kill(&q->q_usage_counter); - blk_mq_run_hw_queues(q, false); + if (q->mq_ops) + blk_mq_run_hw_queues(q, false); } } EXPORT_SYMBOL_GPL(blk_freeze_queue_start); @@ -255,13 +257,6 @@ void blk_mq_wake_waiters(struct request_queue *q) queue_for_each_hw_ctx(q, hctx, i) if (blk_mq_hw_queue_mapped(hctx)) blk_mq_tag_wakeup_all(hctx->tags, true); - - /* - * If we are called because the queue has now been marked as - * dying, we need to ensure that processes currently waiting on - * the queue are notified as well. - */ - wake_up_all(&q->mq_freeze_wq); } bool blk_mq_can_queue(struct blk_mq_hw_ctx *hctx) @@ -296,6 +291,8 @@ static struct request *blk_mq_rq_ctx_init(struct blk_mq_alloc_data *data, rq->q = data->q; rq->mq_ctx = data->ctx; rq->cmd_flags = op; + if (data->flags & BLK_MQ_REQ_PREEMPT) + rq->rq_flags |= RQF_PREEMPT; if (blk_queue_io_stat(data->q)) rq->rq_flags |= RQF_IO_STAT; /* do not touch atomic flags, it needs atomic ops against the timer */ @@ -336,12 +333,14 @@ static struct request *blk_mq_get_request(struct request_queue *q, struct elevator_queue *e = q->elevator; struct request *rq; unsigned int tag; - struct blk_mq_ctx *local_ctx = NULL; + bool put_ctx_on_error = false; blk_queue_enter_live(q); data->q = q; - if (likely(!data->ctx)) - data->ctx = local_ctx = blk_mq_get_ctx(q); + if (likely(!data->ctx)) { + data->ctx = blk_mq_get_ctx(q); + put_ctx_on_error = true; + } if (likely(!data->hctx)) data->hctx = blk_mq_map_queue(q, data->ctx->cpu); if (op & REQ_NOWAIT) @@ -360,8 +359,8 @@ static struct request *blk_mq_get_request(struct request_queue *q, tag = blk_mq_get_tag(data); if (tag == BLK_MQ_TAG_FAIL) { - if (local_ctx) { - blk_mq_put_ctx(local_ctx); + if (put_ctx_on_error) { + blk_mq_put_ctx(data->ctx); data->ctx = NULL; } blk_queue_exit(q); @@ -384,13 +383,13 @@ static struct request *blk_mq_get_request(struct request_queue *q, } struct request *blk_mq_alloc_request(struct request_queue *q, unsigned int op, - unsigned int flags) + blk_mq_req_flags_t flags) { struct blk_mq_alloc_data alloc_data = { .flags = flags }; struct request *rq; int ret; - ret = blk_queue_enter(q, flags & BLK_MQ_REQ_NOWAIT); + ret = blk_queue_enter(q, flags); if (ret) return ERR_PTR(ret); @@ -410,7 +409,7 @@ struct request *blk_mq_alloc_request(struct request_queue *q, unsigned int op, EXPORT_SYMBOL(blk_mq_alloc_request); struct request *blk_mq_alloc_request_hctx(struct request_queue *q, - unsigned int op, unsigned int flags, unsigned int hctx_idx) + unsigned int op, blk_mq_req_flags_t flags, unsigned int hctx_idx) { struct blk_mq_alloc_data alloc_data = { .flags = flags }; struct request *rq; @@ -429,7 +428,7 @@ struct request *blk_mq_alloc_request_hctx(struct request_queue *q, if (hctx_idx >= q->nr_hw_queues) return ERR_PTR(-EIO); - ret = blk_queue_enter(q, true); + ret = blk_queue_enter(q, flags); if (ret) return ERR_PTR(ret); @@ -476,8 +475,14 @@ void blk_mq_free_request(struct request *rq) if (rq->rq_flags & RQF_MQ_INFLIGHT) atomic_dec(&hctx->nr_active); + if (unlikely(laptop_mode && !blk_rq_is_passthrough(rq))) + laptop_io_completion(q->backing_dev_info); + wbt_done(q->rq_wb, &rq->issue_stat); + if (blk_rq_rl(rq)) + blk_put_rl(blk_rq_rl(rq)); + clear_bit(REQ_ATOM_STARTED, &rq->atomic_flags); clear_bit(REQ_ATOM_POLL_SLEPT, &rq->atomic_flags); if (rq->tag != -1) @@ -593,22 +598,32 @@ void blk_mq_start_request(struct request *rq) blk_add_timer(rq); - /* - * Ensure that ->deadline is visible before set the started - * flag and clear the completed flag. - */ - smp_mb__before_atomic(); + WARN_ON_ONCE(test_bit(REQ_ATOM_STARTED, &rq->atomic_flags)); /* * Mark us as started and clear complete. Complete might have been * set if requeue raced with timeout, which then marked it as * complete. So be sure to clear complete again when we start * the request, otherwise we'll ignore the completion event. + * + * Ensure that ->deadline is visible before we set STARTED, such that + * blk_mq_check_expired() is guaranteed to observe our ->deadline when + * it observes STARTED. */ - if (!test_bit(REQ_ATOM_STARTED, &rq->atomic_flags)) - set_bit(REQ_ATOM_STARTED, &rq->atomic_flags); - if (test_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags)) + smp_wmb(); + set_bit(REQ_ATOM_STARTED, &rq->atomic_flags); + if (test_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags)) { + /* + * Coherence order guarantees these consecutive stores to a + * single variable propagate in the specified order. Thus the + * clear_bit() is ordered _after_ the set bit. See + * blk_mq_check_expired(). + * + * (the bits must be part of the same byte for this to be + * true). + */ clear_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags); + } if (q->dma_drain_size && blk_rq_bytes(rq)) { /* @@ -634,6 +649,8 @@ static void __blk_mq_requeue_request(struct request *rq) { struct request_queue *q = rq->q; + blk_mq_put_driver_tag(rq); + trace_block_rq_requeue(q, rq); wbt_requeue(q->rq_wb, &rq->issue_stat); blk_mq_sched_requeue_request(rq); @@ -690,7 +707,7 @@ void blk_mq_add_to_requeue_list(struct request *rq, bool at_head, /* * We abuse this flag that is otherwise used by the I/O scheduler to - * request head insertation from the workqueue. + * request head insertion from the workqueue. */ BUG_ON(rq->rq_flags & RQF_SOFTBARRIER); @@ -778,11 +795,20 @@ static void blk_mq_check_expired(struct blk_mq_hw_ctx *hctx, struct request *rq, void *priv, bool reserved) { struct blk_mq_timeout_data *data = priv; + unsigned long deadline; if (!test_bit(REQ_ATOM_STARTED, &rq->atomic_flags)) return; /* + * Ensures that if we see STARTED we must also see our + * up-to-date deadline, see blk_mq_start_request(). + */ + smp_rmb(); + + deadline = READ_ONCE(rq->deadline); + + /* * The rq being checked may have been freed and reallocated * out already here, we avoid this race by checking rq->deadline * and REQ_ATOM_COMPLETE flag together: @@ -795,11 +821,20 @@ static void blk_mq_check_expired(struct blk_mq_hw_ctx *hctx, * and clearing the flag in blk_mq_start_request(), so * this rq won't be timed out too. */ - if (time_after_eq(jiffies, rq->deadline)) { - if (!blk_mark_rq_complete(rq)) + if (time_after_eq(jiffies, deadline)) { + if (!blk_mark_rq_complete(rq)) { + /* + * Again coherence order ensures that consecutive reads + * from the same variable must be in that order. This + * ensures that if we see COMPLETE clear, we must then + * see STARTED set and we'll ignore this timeout. + * + * (There's also the MB implied by the test_and_clear()) + */ blk_mq_rq_timed_out(rq, reserved); - } else if (!data->next_set || time_after(data->next, rq->deadline)) { - data->next = rq->deadline; + } + } else if (!data->next_set || time_after(data->next, deadline)) { + data->next = deadline; data->next_set = 1; } } @@ -880,6 +915,45 @@ void blk_mq_flush_busy_ctxs(struct blk_mq_hw_ctx *hctx, struct list_head *list) } EXPORT_SYMBOL_GPL(blk_mq_flush_busy_ctxs); +struct dispatch_rq_data { + struct blk_mq_hw_ctx *hctx; + struct request *rq; +}; + +static bool dispatch_rq_from_ctx(struct sbitmap *sb, unsigned int bitnr, + void *data) +{ + struct dispatch_rq_data *dispatch_data = data; + struct blk_mq_hw_ctx *hctx = dispatch_data->hctx; + struct blk_mq_ctx *ctx = hctx->ctxs[bitnr]; + + spin_lock(&ctx->lock); + if (unlikely(!list_empty(&ctx->rq_list))) { + dispatch_data->rq = list_entry_rq(ctx->rq_list.next); + list_del_init(&dispatch_data->rq->queuelist); + if (list_empty(&ctx->rq_list)) + sbitmap_clear_bit(sb, bitnr); + } + spin_unlock(&ctx->lock); + + return !dispatch_data->rq; +} + +struct request *blk_mq_dequeue_from_ctx(struct blk_mq_hw_ctx *hctx, + struct blk_mq_ctx *start) +{ + unsigned off = start ? start->index_hw : 0; + struct dispatch_rq_data data = { + .hctx = hctx, + .rq = NULL, + }; + + __sbitmap_for_each_set(&hctx->ctx_map, off, + dispatch_rq_from_ctx, &data); + + return data.rq; +} + static inline unsigned int queued_to_index(unsigned int queued) { if (!queued) @@ -920,109 +994,95 @@ done: return rq->tag != -1; } -static void __blk_mq_put_driver_tag(struct blk_mq_hw_ctx *hctx, - struct request *rq) -{ - blk_mq_put_tag(hctx, hctx->tags, rq->mq_ctx, rq->tag); - rq->tag = -1; - - if (rq->rq_flags & RQF_MQ_INFLIGHT) { - rq->rq_flags &= ~RQF_MQ_INFLIGHT; - atomic_dec(&hctx->nr_active); - } -} - -static void blk_mq_put_driver_tag_hctx(struct blk_mq_hw_ctx *hctx, - struct request *rq) -{ - if (rq->tag == -1 || rq->internal_tag == -1) - return; - - __blk_mq_put_driver_tag(hctx, rq); -} - -static void blk_mq_put_driver_tag(struct request *rq) +static int blk_mq_dispatch_wake(wait_queue_entry_t *wait, unsigned mode, + int flags, void *key) { struct blk_mq_hw_ctx *hctx; - if (rq->tag == -1 || rq->internal_tag == -1) - return; + hctx = container_of(wait, struct blk_mq_hw_ctx, dispatch_wait); - hctx = blk_mq_map_queue(rq->q, rq->mq_ctx->cpu); - __blk_mq_put_driver_tag(hctx, rq); + list_del_init(&wait->entry); + blk_mq_run_hw_queue(hctx, true); + return 1; } /* - * If we fail getting a driver tag because all the driver tags are already - * assigned and on the dispatch list, BUT the first entry does not have a - * tag, then we could deadlock. For that case, move entries with assigned - * driver tags to the front, leaving the set of tagged requests in the - * same order, and the untagged set in the same order. + * Mark us waiting for a tag. For shared tags, this involves hooking us into + * the tag wakeups. For non-shared tags, we can simply mark us nedeing a + * restart. For both caes, take care to check the condition again after + * marking us as waiting. */ -static bool reorder_tags_to_front(struct list_head *list) -{ - struct request *rq, *tmp, *first = NULL; - - list_for_each_entry_safe_reverse(rq, tmp, list, queuelist) { - if (rq == first) - break; - if (rq->tag != -1) { - list_move(&rq->queuelist, list); - if (!first) - first = rq; - } - } - - return first != NULL; -} - -static int blk_mq_dispatch_wake(wait_queue_entry_t *wait, unsigned mode, int flags, - void *key) +static bool blk_mq_mark_tag_wait(struct blk_mq_hw_ctx **hctx, + struct request *rq) { - struct blk_mq_hw_ctx *hctx; + struct blk_mq_hw_ctx *this_hctx = *hctx; + bool shared_tags = (this_hctx->flags & BLK_MQ_F_TAG_SHARED) != 0; + struct sbq_wait_state *ws; + wait_queue_entry_t *wait; + bool ret; - hctx = container_of(wait, struct blk_mq_hw_ctx, dispatch_wait); + if (!shared_tags) { + if (!test_bit(BLK_MQ_S_SCHED_RESTART, &this_hctx->state)) + set_bit(BLK_MQ_S_SCHED_RESTART, &this_hctx->state); + } else { + wait = &this_hctx->dispatch_wait; + if (!list_empty_careful(&wait->entry)) + return false; - list_del(&wait->entry); - clear_bit_unlock(BLK_MQ_S_TAG_WAITING, &hctx->state); - blk_mq_run_hw_queue(hctx, true); - return 1; -} + spin_lock(&this_hctx->lock); + if (!list_empty(&wait->entry)) { + spin_unlock(&this_hctx->lock); + return false; + } -static bool blk_mq_dispatch_wait_add(struct blk_mq_hw_ctx *hctx) -{ - struct sbq_wait_state *ws; + ws = bt_wait_ptr(&this_hctx->tags->bitmap_tags, this_hctx); + add_wait_queue(&ws->wait, wait); + } /* - * The TAG_WAITING bit serves as a lock protecting hctx->dispatch_wait. - * The thread which wins the race to grab this bit adds the hardware - * queue to the wait queue. + * It's possible that a tag was freed in the window between the + * allocation failure and adding the hardware queue to the wait + * queue. */ - if (test_bit(BLK_MQ_S_TAG_WAITING, &hctx->state) || - test_and_set_bit_lock(BLK_MQ_S_TAG_WAITING, &hctx->state)) - return false; + ret = blk_mq_get_driver_tag(rq, hctx, false); - init_waitqueue_func_entry(&hctx->dispatch_wait, blk_mq_dispatch_wake); - ws = bt_wait_ptr(&hctx->tags->bitmap_tags, hctx); + if (!shared_tags) { + /* + * Don't clear RESTART here, someone else could have set it. + * At most this will cost an extra queue run. + */ + return ret; + } else { + if (!ret) { + spin_unlock(&this_hctx->lock); + return false; + } - /* - * As soon as this returns, it's no longer safe to fiddle with - * hctx->dispatch_wait, since a completion can wake up the wait queue - * and unlock the bit. - */ - add_wait_queue(&ws->wait, &hctx->dispatch_wait); - return true; + /* + * We got a tag, remove ourselves from the wait queue to ensure + * someone else gets the wakeup. + */ + spin_lock_irq(&ws->wait.lock); + list_del_init(&wait->entry); + spin_unlock_irq(&ws->wait.lock); + spin_unlock(&this_hctx->lock); + return true; + } } -bool blk_mq_dispatch_rq_list(struct request_queue *q, struct list_head *list) +bool blk_mq_dispatch_rq_list(struct request_queue *q, struct list_head *list, + bool got_budget) { struct blk_mq_hw_ctx *hctx; - struct request *rq; + struct request *rq, *nxt; + bool no_tag = false; int errors, queued; if (list_empty(list)) return false; + WARN_ON(!list_is_singular(list) && got_budget); + /* * Now process all the entries, sending them to the driver. */ @@ -1033,23 +1093,29 @@ bool blk_mq_dispatch_rq_list(struct request_queue *q, struct list_head *list) rq = list_first_entry(list, struct request, queuelist); if (!blk_mq_get_driver_tag(rq, &hctx, false)) { - if (!queued && reorder_tags_to_front(list)) - continue; - /* * The initial allocation attempt failed, so we need to - * rerun the hardware queue when a tag is freed. + * rerun the hardware queue when a tag is freed. The + * waitqueue takes care of that. If the queue is run + * before we add this entry back on the dispatch list, + * we'll re-run it below. */ - if (!blk_mq_dispatch_wait_add(hctx)) + if (!blk_mq_mark_tag_wait(&hctx, rq)) { + if (got_budget) + blk_mq_put_dispatch_budget(hctx); + /* + * For non-shared tags, the RESTART check + * will suffice. + */ + if (hctx->flags & BLK_MQ_F_TAG_SHARED) + no_tag = true; break; + } + } - /* - * It's possible that a tag was freed in the window - * between the allocation failure and adding the - * hardware queue to the wait queue. - */ - if (!blk_mq_get_driver_tag(rq, &hctx, false)) - break; + if (!got_budget && !blk_mq_get_dispatch_budget(hctx)) { + blk_mq_put_driver_tag(rq); + break; } list_del_init(&rq->queuelist); @@ -1063,15 +1129,21 @@ bool blk_mq_dispatch_rq_list(struct request_queue *q, struct list_head *list) if (list_empty(list)) bd.last = true; else { - struct request *nxt; - nxt = list_first_entry(list, struct request, queuelist); bd.last = !blk_mq_get_driver_tag(nxt, NULL, false); } ret = q->mq_ops->queue_rq(hctx, &bd); if (ret == BLK_STS_RESOURCE) { - blk_mq_put_driver_tag_hctx(hctx, rq); + /* + * If an I/O scheduler has been configured and we got a + * driver tag for the next request already, free it + * again. + */ + if (!list_empty(list)) { + nxt = list_first_entry(list, struct request, queuelist); + blk_mq_put_driver_tag(nxt); + } list_add(&rq->queuelist, list); __blk_mq_requeue_request(rq); break; @@ -1093,13 +1165,6 @@ bool blk_mq_dispatch_rq_list(struct request_queue *q, struct list_head *list) * that is where we will continue on next queue run. */ if (!list_empty(list)) { - /* - * If an I/O scheduler has been configured and we got a driver - * tag for the next request already, free it again. - */ - rq = list_first_entry(list, struct request, queuelist); - blk_mq_put_driver_tag(rq); - spin_lock(&hctx->lock); list_splice_init(list, &hctx->dispatch); spin_unlock(&hctx->lock); @@ -1109,10 +1174,10 @@ bool blk_mq_dispatch_rq_list(struct request_queue *q, struct list_head *list) * it is no longer set that means that it was cleared by another * thread and hence that a queue rerun is needed. * - * If TAG_WAITING is set that means that an I/O scheduler has - * been configured and another thread is waiting for a driver - * tag. To guarantee fairness, do not rerun this hardware queue - * but let the other thread grab the driver tag. + * If 'no_tag' is set, that means that we failed getting + * a driver tag with an I/O scheduler attached. If our dispatch + * waitqueue is no longer active, ensure that we run the queue + * AFTER adding our entries back to the list. * * If no I/O scheduler has been configured it is possible that * the hardware queue got stopped and restarted before requests @@ -1124,8 +1189,8 @@ bool blk_mq_dispatch_rq_list(struct request_queue *q, struct list_head *list) * returning BLK_STS_RESOURCE. Two exceptions are scsi-mq * and dm-rq. */ - if (!blk_mq_sched_needs_restart(hctx) && - !test_bit(BLK_MQ_S_TAG_WAITING, &hctx->state)) + if (!blk_mq_sched_needs_restart(hctx) || + (no_tag && list_empty_careful(&hctx->dispatch_wait.entry))) blk_mq_run_hw_queue(hctx, true); } @@ -1218,9 +1283,14 @@ void blk_mq_delay_run_hw_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs) } EXPORT_SYMBOL(blk_mq_delay_run_hw_queue); -void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async) +bool blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async) { - __blk_mq_delay_run_hw_queue(hctx, async, 0); + if (blk_mq_hctx_has_pending(hctx)) { + __blk_mq_delay_run_hw_queue(hctx, async, 0); + return true; + } + + return false; } EXPORT_SYMBOL(blk_mq_run_hw_queue); @@ -1230,8 +1300,7 @@ void blk_mq_run_hw_queues(struct request_queue *q, bool async) int i; queue_for_each_hw_ctx(q, hctx, i) { - if (!blk_mq_hctx_has_pending(hctx) || - blk_mq_hctx_stopped(hctx)) + if (blk_mq_hctx_stopped(hctx)) continue; blk_mq_run_hw_queue(hctx, async); @@ -1405,7 +1474,7 @@ void __blk_mq_insert_request(struct blk_mq_hw_ctx *hctx, struct request *rq, * Should only be used carefully, when the caller knows we want to * bypass a potential IO scheduler on the target device. */ -void blk_mq_request_bypass_insert(struct request *rq) +void blk_mq_request_bypass_insert(struct request *rq, bool run_queue) { struct blk_mq_ctx *ctx = rq->mq_ctx; struct blk_mq_hw_ctx *hctx = blk_mq_map_queue(rq->q, ctx->cpu); @@ -1414,7 +1483,8 @@ void blk_mq_request_bypass_insert(struct request *rq) list_add_tail(&rq->queuelist, &hctx->dispatch); spin_unlock(&hctx->lock); - blk_mq_run_hw_queue(hctx, false); + if (run_queue) + blk_mq_run_hw_queue(hctx, false); } void blk_mq_insert_requests(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx, @@ -1501,13 +1571,9 @@ static void blk_mq_bio_to_request(struct request *rq, struct bio *bio) { blk_init_request_from_bio(rq, bio); - blk_account_io_start(rq, true); -} + blk_rq_set_rl(rq, blk_get_rl(rq->q, bio)); -static inline bool hctx_allow_merges(struct blk_mq_hw_ctx *hctx) -{ - return (hctx->flags & BLK_MQ_F_SHOULD_MERGE) && - !blk_queue_nomerges(hctx->queue); + blk_account_io_start(rq, true); } static inline void blk_mq_queue_io(struct blk_mq_hw_ctx *hctx, @@ -1552,6 +1618,11 @@ static void __blk_mq_try_issue_directly(struct blk_mq_hw_ctx *hctx, if (!blk_mq_get_driver_tag(rq, NULL, false)) goto insert; + if (!blk_mq_get_dispatch_budget(hctx)) { + blk_mq_put_driver_tag(rq); + goto insert; + } + new_cookie = request_to_qc_t(hctx, rq); /* @@ -1641,13 +1712,10 @@ static blk_qc_t blk_mq_make_request(struct request_queue *q, struct bio *bio) if (unlikely(is_flush_fua)) { blk_mq_put_ctx(data.ctx); blk_mq_bio_to_request(rq, bio); - if (q->elevator) { - blk_mq_sched_insert_request(rq, false, true, true, - true); - } else { - blk_insert_flush(rq); - blk_mq_run_hw_queue(data.hctx, true); - } + + /* bypass scheduler for flush rq */ + blk_insert_flush(rq); + blk_mq_run_hw_queue(data.hctx, true); } else if (plug && q->nr_hw_queues == 1) { struct request *last = NULL; @@ -1990,6 +2058,9 @@ static int blk_mq_init_hctx(struct request_queue *q, hctx->nr_ctx = 0; + init_waitqueue_func_entry(&hctx->dispatch_wait, blk_mq_dispatch_wake); + INIT_LIST_HEAD(&hctx->dispatch_wait.entry); + if (set->ops->init_hctx && set->ops->init_hctx(hctx, set->driver_data, hctx_idx)) goto free_bitmap; @@ -2229,8 +2300,11 @@ static void blk_mq_add_queue_tag_set(struct blk_mq_tag_set *set, mutex_lock(&set->tag_list_lock); - /* Check to see if we're transitioning to shared (from 1 to 2 queues). */ - if (!list_empty(&set->tag_list) && !(set->flags & BLK_MQ_F_TAG_SHARED)) { + /* + * Check to see if we're transitioning to shared (from 1 to 2 queues). + */ + if (!list_empty(&set->tag_list) && + !(set->flags & BLK_MQ_F_TAG_SHARED)) { set->flags |= BLK_MQ_F_TAG_SHARED; /* update existing queue */ blk_mq_update_tag_set_depth(set, true); @@ -2404,6 +2478,8 @@ struct request_queue *blk_mq_init_allocated_queue(struct blk_mq_tag_set *set, spin_lock_init(&q->requeue_lock); blk_queue_make_request(q, blk_mq_make_request); + if (q->mq_ops->poll) + q->poll_fn = blk_mq_poll; /* * Do this after blk_queue_make_request() overrides it... @@ -2460,10 +2536,9 @@ static void blk_mq_queue_reinit(struct request_queue *q) /* * redo blk_mq_init_cpu_queues and blk_mq_init_hw_queues. FIXME: maybe - * we should change hctx numa_node according to new topology (this - * involves free and re-allocate memory, worthy doing?) + * we should change hctx numa_node according to the new topology (this + * involves freeing and re-allocating memory, worth doing?) */ - blk_mq_map_swqueue(q); blk_mq_sysfs_register(q); @@ -2552,6 +2627,9 @@ int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set) if (!set->ops->queue_rq) return -EINVAL; + if (!set->ops->get_budget ^ !set->ops->put_budget) + return -EINVAL; + if (set->queue_depth > BLK_MQ_MAX_DEPTH) { pr_info("blk-mq: reduced tag depth to %u\n", BLK_MQ_MAX_DEPTH); @@ -2642,8 +2720,7 @@ int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr) * queue depth. This is similar to what the old code would do. */ if (!hctx->sched_tags) { - ret = blk_mq_tag_update_depth(hctx, &hctx->tags, - min(nr, set->queue_depth), + ret = blk_mq_tag_update_depth(hctx, &hctx->tags, nr, false); } else { ret = blk_mq_tag_update_depth(hctx, &hctx->sched_tags, @@ -2863,20 +2940,14 @@ static bool __blk_mq_poll(struct blk_mq_hw_ctx *hctx, struct request *rq) return false; } -bool blk_mq_poll(struct request_queue *q, blk_qc_t cookie) +static bool blk_mq_poll(struct request_queue *q, blk_qc_t cookie) { struct blk_mq_hw_ctx *hctx; - struct blk_plug *plug; struct request *rq; - if (!q->mq_ops || !q->mq_ops->poll || !blk_qc_t_valid(cookie) || - !test_bit(QUEUE_FLAG_POLL, &q->queue_flags)) + if (!test_bit(QUEUE_FLAG_POLL, &q->queue_flags)) return false; - plug = current->plug; - if (plug) - blk_flush_plug_list(plug, false); - hctx = q->queue_hw_ctx[blk_qc_t_to_queue_num(cookie)]; if (!blk_qc_t_is_internal(cookie)) rq = blk_mq_tag_to_rq(hctx->tags, blk_qc_t_to_tag(cookie)); @@ -2894,10 +2965,15 @@ bool blk_mq_poll(struct request_queue *q, blk_qc_t cookie) return __blk_mq_poll(hctx, rq); } -EXPORT_SYMBOL_GPL(blk_mq_poll); static int __init blk_mq_init(void) { + /* + * See comment in block/blk.h rq_atomic_flags enum + */ + BUILD_BUG_ON((REQ_ATOM_STARTED / BITS_PER_BYTE) != + (REQ_ATOM_COMPLETE / BITS_PER_BYTE)); + cpuhp_setup_state_multi(CPUHP_BLK_MQ_DEAD, "block/mq:dead", NULL, blk_mq_hctx_notify_dead); return 0; diff --git a/block/blk-mq.h b/block/blk-mq.h index 4933af9..6c7c3ff 100644 --- a/block/blk-mq.h +++ b/block/blk-mq.h @@ -3,6 +3,7 @@ #define INT_BLK_MQ_H #include "blk-stat.h" +#include "blk-mq-tag.h" struct blk_mq_tag_set; @@ -26,16 +27,16 @@ struct blk_mq_ctx { struct kobject kobj; } ____cacheline_aligned_in_smp; -void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async); void blk_mq_freeze_queue(struct request_queue *q); void blk_mq_free_queue(struct request_queue *q); int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr); void blk_mq_wake_waiters(struct request_queue *q); -bool blk_mq_dispatch_rq_list(struct request_queue *, struct list_head *); +bool blk_mq_dispatch_rq_list(struct request_queue *, struct list_head *, bool); void blk_mq_flush_busy_ctxs(struct blk_mq_hw_ctx *hctx, struct list_head *list); -bool blk_mq_hctx_has_pending(struct blk_mq_hw_ctx *hctx); bool blk_mq_get_driver_tag(struct request *rq, struct blk_mq_hw_ctx **hctx, bool wait); +struct request *blk_mq_dequeue_from_ctx(struct blk_mq_hw_ctx *hctx, + struct blk_mq_ctx *start); /* * Internal helpers for allocating/freeing the request map @@ -55,7 +56,7 @@ int blk_mq_alloc_rqs(struct blk_mq_tag_set *set, struct blk_mq_tags *tags, */ void __blk_mq_insert_request(struct blk_mq_hw_ctx *hctx, struct request *rq, bool at_head); -void blk_mq_request_bypass_insert(struct request *rq); +void blk_mq_request_bypass_insert(struct request *rq, bool run_queue); void blk_mq_insert_requests(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx, struct list_head *list); @@ -109,7 +110,7 @@ static inline void blk_mq_put_ctx(struct blk_mq_ctx *ctx) struct blk_mq_alloc_data { /* input parameter */ struct request_queue *q; - unsigned int flags; + blk_mq_req_flags_t flags; unsigned int shallow_depth; /* input & output parameter */ @@ -138,4 +139,53 @@ static inline bool blk_mq_hw_queue_mapped(struct blk_mq_hw_ctx *hctx) void blk_mq_in_flight(struct request_queue *q, struct hd_struct *part, unsigned int inflight[2]); +static inline void blk_mq_put_dispatch_budget(struct blk_mq_hw_ctx *hctx) +{ + struct request_queue *q = hctx->queue; + + if (q->mq_ops->put_budget) + q->mq_ops->put_budget(hctx); +} + +static inline bool blk_mq_get_dispatch_budget(struct blk_mq_hw_ctx *hctx) +{ + struct request_queue *q = hctx->queue; + + if (q->mq_ops->get_budget) + return q->mq_ops->get_budget(hctx); + return true; +} + +static inline void __blk_mq_put_driver_tag(struct blk_mq_hw_ctx *hctx, + struct request *rq) +{ + blk_mq_put_tag(hctx, hctx->tags, rq->mq_ctx, rq->tag); + rq->tag = -1; + + if (rq->rq_flags & RQF_MQ_INFLIGHT) { + rq->rq_flags &= ~RQF_MQ_INFLIGHT; + atomic_dec(&hctx->nr_active); + } +} + +static inline void blk_mq_put_driver_tag_hctx(struct blk_mq_hw_ctx *hctx, + struct request *rq) +{ + if (rq->tag == -1 || rq->internal_tag == -1) + return; + + __blk_mq_put_driver_tag(hctx, rq); +} + +static inline void blk_mq_put_driver_tag(struct request *rq) +{ + struct blk_mq_hw_ctx *hctx; + + if (rq->tag == -1 || rq->internal_tag == -1) + return; + + hctx = blk_mq_map_queue(rq->q, rq->mq_ctx->cpu); + __blk_mq_put_driver_tag(hctx, rq); +} + #endif diff --git a/block/blk-settings.c b/block/blk-settings.c index 8559e95..48ebe6b 100644 --- a/block/blk-settings.c +++ b/block/blk-settings.c @@ -157,7 +157,7 @@ EXPORT_SYMBOL(blk_set_stacking_limits); * Caveat: * The driver that does this *must* be able to deal appropriately * with buffers in "highmemory". This can be accomplished by either calling - * __bio_kmap_atomic() to get a temporary kernel mapping, or by calling + * kmap_atomic() to get a temporary kernel mapping, or by calling * blk_queue_bounce() to create a buffer in normal memory. **/ void blk_queue_make_request(struct request_queue *q, make_request_fn *mfn) diff --git a/block/blk-stat.c b/block/blk-stat.c index c52356d..3a2f3c9 100644 --- a/block/blk-stat.c +++ b/block/blk-stat.c @@ -11,8 +11,6 @@ #include "blk-mq.h" #include "blk.h" -#define BLK_RQ_STAT_BATCH 64 - struct blk_queue_stats { struct list_head callbacks; spinlock_t lock; @@ -23,45 +21,21 @@ static void blk_stat_init(struct blk_rq_stat *stat) { stat->min = -1ULL; stat->max = stat->nr_samples = stat->mean = 0; - stat->batch = stat->nr_batch = 0; -} - -static void blk_stat_flush_batch(struct blk_rq_stat *stat) -{ - const s32 nr_batch = READ_ONCE(stat->nr_batch); - const s32 nr_samples = READ_ONCE(stat->nr_samples); - - if (!nr_batch) - return; - if (!nr_samples) - stat->mean = div64_s64(stat->batch, nr_batch); - else { - stat->mean = div64_s64((stat->mean * nr_samples) + - stat->batch, - nr_batch + nr_samples); - } - - stat->nr_samples += nr_batch; - stat->nr_batch = stat->batch = 0; + stat->batch = 0; } +/* src is a per-cpu stat, mean isn't initialized */ static void blk_stat_sum(struct blk_rq_stat *dst, struct blk_rq_stat *src) { - blk_stat_flush_batch(src); - if (!src->nr_samples) return; dst->min = min(dst->min, src->min); dst->max = max(dst->max, src->max); - if (!dst->nr_samples) - dst->mean = src->mean; - else { - dst->mean = div64_s64((src->mean * src->nr_samples) + - (dst->mean * dst->nr_samples), - dst->nr_samples + src->nr_samples); - } + dst->mean = div_u64(src->batch + dst->mean * dst->nr_samples, + dst->nr_samples + src->nr_samples); + dst->nr_samples += src->nr_samples; } @@ -69,13 +43,8 @@ static void __blk_stat_add(struct blk_rq_stat *stat, u64 value) { stat->min = min(stat->min, value); stat->max = max(stat->max, value); - - if (stat->batch + value < stat->batch || - stat->nr_batch + 1 == BLK_RQ_STAT_BATCH) - blk_stat_flush_batch(stat); - stat->batch += value; - stat->nr_batch++; + stat->nr_samples++; } void blk_stat_add(struct request *rq) @@ -84,7 +53,7 @@ void blk_stat_add(struct request *rq) struct blk_stat_callback *cb; struct blk_rq_stat *stat; int bucket; - s64 now, value; + u64 now, value; now = __blk_stat_time(ktime_to_ns(ktime_get())); if (now < blk_stat_time(&rq->issue_stat)) diff --git a/block/blk-throttle.c b/block/blk-throttle.c index 8631763..96ad326 100644 --- a/block/blk-throttle.c +++ b/block/blk-throttle.c @@ -2113,8 +2113,12 @@ static inline void throtl_update_latency_buckets(struct throtl_data *td) static void blk_throtl_assoc_bio(struct throtl_grp *tg, struct bio *bio) { #ifdef CONFIG_BLK_DEV_THROTTLING_LOW - if (bio->bi_css) + if (bio->bi_css) { + if (bio->bi_cg_private) + blkg_put(tg_to_blkg(bio->bi_cg_private)); bio->bi_cg_private = tg; + blkg_get(tg_to_blkg(tg)); + } blk_stat_set_issue(&bio->bi_issue_stat, bio_sectors(bio)); #endif } @@ -2284,8 +2288,10 @@ void blk_throtl_bio_endio(struct bio *bio) start_time = blk_stat_time(&bio->bi_issue_stat) >> 10; finish_time = __blk_stat_time(finish_time_ns) >> 10; - if (!start_time || finish_time <= start_time) + if (!start_time || finish_time <= start_time) { + blkg_put(tg_to_blkg(tg)); return; + } lat = finish_time - start_time; /* this is only for bio based driver */ @@ -2315,6 +2321,8 @@ void blk_throtl_bio_endio(struct bio *bio) tg->bio_cnt /= 2; tg->bad_bio_cnt /= 2; } + + blkg_put(tg_to_blkg(tg)); } #endif diff --git a/block/blk-timeout.c b/block/blk-timeout.c index 17ec83b..764ecf9 100644 --- a/block/blk-timeout.c +++ b/block/blk-timeout.c @@ -134,8 +134,6 @@ void blk_timeout_work(struct work_struct *work) struct request *rq, *tmp; int next_set = 0; - if (blk_queue_enter(q, true)) - return; spin_lock_irqsave(q->queue_lock, flags); list_for_each_entry_safe(rq, tmp, &q->timeout_list, timeout_list) @@ -145,7 +143,6 @@ void blk_timeout_work(struct work_struct *work) mod_timer(&q->timeout, round_jiffies_up(next)); spin_unlock_irqrestore(q->queue_lock, flags); - blk_queue_exit(q); } /** @@ -211,7 +208,7 @@ void blk_add_timer(struct request *req) if (!req->timeout) req->timeout = q->rq_timeout; - req->deadline = jiffies + req->timeout; + WRITE_ONCE(req->deadline, jiffies + req->timeout); /* * Only the non-mq case needs to add the request to a protected list. diff --git a/block/blk-wbt.c b/block/blk-wbt.c index d822530..b252da0 100644 --- a/block/blk-wbt.c +++ b/block/blk-wbt.c @@ -654,7 +654,7 @@ void wbt_set_write_cache(struct rq_wb *rwb, bool write_cache_on) } /* - * Disable wbt, if enabled by default. Only called from CFQ. + * Disable wbt, if enabled by default. */ void wbt_disable_default(struct request_queue *q) { diff --git a/block/blk.h b/block/blk.h index 85be8b2..3f14469 100644 --- a/block/blk.h +++ b/block/blk.h @@ -123,8 +123,15 @@ void blk_account_io_done(struct request *req); * Internal atomic flags for request handling */ enum rq_atomic_flags { + /* + * Keep these two bits first - not because we depend on the + * value of them, but we do depend on them being in the same + * byte of storage to ensure ordering on writes. Keeping them + * first will achieve that nicely. + */ REQ_ATOM_COMPLETE = 0, REQ_ATOM_STARTED, + REQ_ATOM_POLL_SLEPT, }; @@ -149,45 +156,6 @@ static inline void blk_clear_rq_complete(struct request *rq) void blk_insert_flush(struct request *rq); -static inline struct request *__elv_next_request(struct request_queue *q) -{ - struct request *rq; - struct blk_flush_queue *fq = blk_get_flush_queue(q, NULL); - - WARN_ON_ONCE(q->mq_ops); - - while (1) { - if (!list_empty(&q->queue_head)) { - rq = list_entry_rq(q->queue_head.next); - return rq; - } - - /* - * Flush request is running and flush request isn't queueable - * in the drive, we can hold the queue till flush request is - * finished. Even we don't do this, driver can't dispatch next - * requests and will requeue them. And this can improve - * throughput too. For example, we have request flush1, write1, - * flush 2. flush1 is dispatched, then queue is hold, write1 - * isn't inserted to queue. After flush1 is finished, flush2 - * will be dispatched. Since disk cache is already clean, - * flush2 will be finished very soon, so looks like flush2 is - * folded to flush1. - * Since the queue is hold, a flag is set to indicate the queue - * should be restarted later. Please see flush_end_io() for - * details. - */ - if (fq->flush_pending_idx != fq->flush_running_idx && - !queue_flush_queueable(q)) { - fq->flush_queue_delayed = 1; - return NULL; - } - if (unlikely(blk_queue_bypass(q)) || - !q->elevator->type->ops.sq.elevator_dispatch_fn(q, 0)) - return NULL; - } -} - static inline void elv_activate_rq(struct request_queue *q, struct request *rq) { struct elevator_queue *e = q->elevator; diff --git a/block/bsg.c b/block/bsg.c index ee1335c..452f94f 100644 --- a/block/bsg.c +++ b/block/bsg.c @@ -137,7 +137,7 @@ static inline struct hlist_head *bsg_dev_idx_hash(int index) static int blk_fill_sgv4_hdr_rq(struct request_queue *q, struct request *rq, struct sg_io_v4 *hdr, struct bsg_device *bd, - fmode_t has_write_perm) + fmode_t mode) { struct scsi_request *req = scsi_req(rq); @@ -152,7 +152,7 @@ static int blk_fill_sgv4_hdr_rq(struct request_queue *q, struct request *rq, return -EFAULT; if (hdr->subprotocol == BSG_SUB_PROTOCOL_SCSI_CMD) { - if (blk_verify_command(req->cmd, has_write_perm)) + if (blk_verify_command(req->cmd, mode)) return -EPERM; } else if (!capable(CAP_SYS_RAWIO)) return -EPERM; @@ -206,7 +206,7 @@ bsg_validate_sgv4_hdr(struct sg_io_v4 *hdr, int *op) * map sg_io_v4 to a request. */ static struct request * -bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr, fmode_t has_write_perm) +bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr, fmode_t mode) { struct request_queue *q = bd->queue; struct request *rq, *next_rq = NULL; @@ -237,7 +237,7 @@ bsg_map_hdr(struct bsg_device *bd, struct sg_io_v4 *hdr, fmode_t has_write_perm) if (IS_ERR(rq)) return rq; - ret = blk_fill_sgv4_hdr_rq(q, rq, hdr, bd, has_write_perm); + ret = blk_fill_sgv4_hdr_rq(q, rq, hdr, bd, mode); if (ret) goto out; @@ -587,8 +587,7 @@ bsg_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) } static int __bsg_write(struct bsg_device *bd, const char __user *buf, - size_t count, ssize_t *bytes_written, - fmode_t has_write_perm) + size_t count, ssize_t *bytes_written, fmode_t mode) { struct bsg_command *bc; struct request *rq; @@ -619,7 +618,7 @@ static int __bsg_write(struct bsg_device *bd, const char __user *buf, /* * get a request, fill in the blanks, and add to request queue */ - rq = bsg_map_hdr(bd, &bc->hdr, has_write_perm); + rq = bsg_map_hdr(bd, &bc->hdr, mode); if (IS_ERR(rq)) { ret = PTR_ERR(rq); rq = NULL; @@ -655,8 +654,7 @@ bsg_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) bsg_set_block(bd, file); bytes_written = 0; - ret = __bsg_write(bd, buf, count, &bytes_written, - file->f_mode & FMODE_WRITE); + ret = __bsg_write(bd, buf, count, &bytes_written, file->f_mode); *ppos = bytes_written; @@ -915,7 +913,7 @@ static long bsg_ioctl(struct file *file, unsigned int cmd, unsigned long arg) if (copy_from_user(&hdr, uarg, sizeof(hdr))) return -EFAULT; - rq = bsg_map_hdr(bd, &hdr, file->f_mode & FMODE_WRITE); + rq = bsg_map_hdr(bd, &hdr, file->f_mode); if (IS_ERR(rq)) return PTR_ERR(rq); diff --git a/block/elevator.c b/block/elevator.c index 153926a..7bda083 100644 --- a/block/elevator.c +++ b/block/elevator.c @@ -83,12 +83,25 @@ bool elv_bio_merge_ok(struct request *rq, struct bio *bio) } EXPORT_SYMBOL(elv_bio_merge_ok); -static struct elevator_type *elevator_find(const char *name) +static bool elevator_match(const struct elevator_type *e, const char *name) +{ + if (!strcmp(e->elevator_name, name)) + return true; + if (e->elevator_alias && !strcmp(e->elevator_alias, name)) + return true; + + return false; +} + +/* + * Return scheduler with name 'name' and with matching 'mq capability + */ +static struct elevator_type *elevator_find(const char *name, bool mq) { struct elevator_type *e; list_for_each_entry(e, &elv_list, list) { - if (!strcmp(e->elevator_name, name)) + if (elevator_match(e, name) && (mq == e->uses_mq)) return e; } @@ -100,25 +113,25 @@ static void elevator_put(struct elevator_type *e) module_put(e->elevator_owner); } -static struct elevator_type *elevator_get(const char *name, bool try_loading) +static struct elevator_type *elevator_get(struct request_queue *q, + const char *name, bool try_loading) { struct elevator_type *e; spin_lock(&elv_list_lock); - e = elevator_find(name); + e = elevator_find(name, q->mq_ops != NULL); if (!e && try_loading) { spin_unlock(&elv_list_lock); request_module("%s-iosched", name); spin_lock(&elv_list_lock); - e = elevator_find(name); + e = elevator_find(name, q->mq_ops != NULL); } if (e && !try_module_get(e->elevator_owner)) e = NULL; spin_unlock(&elv_list_lock); - return e; } @@ -144,8 +157,12 @@ void __init load_default_elevator_module(void) if (!chosen_elevator[0]) return; + /* + * Boot parameter is deprecated, we haven't supported that for MQ. + * Only look for non-mq schedulers from here. + */ spin_lock(&elv_list_lock); - e = elevator_find(chosen_elevator); + e = elevator_find(chosen_elevator, false); spin_unlock(&elv_list_lock); if (!e) @@ -202,7 +219,7 @@ int elevator_init(struct request_queue *q, char *name) q->boundary_rq = NULL; if (name) { - e = elevator_get(name, true); + e = elevator_get(q, name, true); if (!e) return -EINVAL; } @@ -214,7 +231,7 @@ int elevator_init(struct request_queue *q, char *name) * allowed from async. */ if (!e && !q->mq_ops && *chosen_elevator) { - e = elevator_get(chosen_elevator, false); + e = elevator_get(q, chosen_elevator, false); if (!e) printk(KERN_ERR "I/O scheduler %s not found\n", chosen_elevator); @@ -229,17 +246,17 @@ int elevator_init(struct request_queue *q, char *name) */ if (q->mq_ops) { if (q->nr_hw_queues == 1) - e = elevator_get("mq-deadline", false); + e = elevator_get(q, "mq-deadline", false); if (!e) return 0; } else - e = elevator_get(CONFIG_DEFAULT_IOSCHED, false); + e = elevator_get(q, CONFIG_DEFAULT_IOSCHED, false); if (!e) { printk(KERN_ERR "Default I/O scheduler not found. " \ "Using noop.\n"); - e = elevator_get("noop", false); + e = elevator_get(q, "noop", false); } } @@ -905,7 +922,7 @@ int elv_register(struct elevator_type *e) /* register, don't allow duplicate names */ spin_lock(&elv_list_lock); - if (elevator_find(e->elevator_name)) { + if (elevator_find(e->elevator_name, e->uses_mq)) { spin_unlock(&elv_list_lock); if (e->icq_cache) kmem_cache_destroy(e->icq_cache); @@ -915,9 +932,9 @@ int elv_register(struct elevator_type *e) spin_unlock(&elv_list_lock); /* print pretty message */ - if (!strcmp(e->elevator_name, chosen_elevator) || + if (elevator_match(e, chosen_elevator) || (!*chosen_elevator && - !strcmp(e->elevator_name, CONFIG_DEFAULT_IOSCHED))) + elevator_match(e, CONFIG_DEFAULT_IOSCHED))) def = " (default)"; printk(KERN_INFO "io scheduler %s registered%s\n", e->elevator_name, @@ -1066,25 +1083,15 @@ static int __elevator_change(struct request_queue *q, const char *name) return elevator_switch(q, NULL); strlcpy(elevator_name, name, sizeof(elevator_name)); - e = elevator_get(strstrip(elevator_name), true); + e = elevator_get(q, strstrip(elevator_name), true); if (!e) return -EINVAL; - if (q->elevator && - !strcmp(elevator_name, q->elevator->type->elevator_name)) { + if (q->elevator && elevator_match(q->elevator->type, elevator_name)) { elevator_put(e); return 0; } - if (!e->uses_mq && q->mq_ops) { - elevator_put(e); - return -EINVAL; - } - if (e->uses_mq && !q->mq_ops) { - elevator_put(e); - return -EINVAL; - } - return elevator_switch(q, e); } @@ -1116,9 +1123,10 @@ ssize_t elv_iosched_show(struct request_queue *q, char *name) struct elevator_queue *e = q->elevator; struct elevator_type *elv = NULL; struct elevator_type *__e; + bool uses_mq = q->mq_ops != NULL; int len = 0; - if (!blk_queue_stackable(q)) + if (!queue_is_rq_based(q)) return sprintf(name, "none\n"); if (!q->elevator) @@ -1128,7 +1136,8 @@ ssize_t elv_iosched_show(struct request_queue *q, char *name) spin_lock(&elv_list_lock); list_for_each_entry(__e, &elv_list, list) { - if (elv && !strcmp(elv->elevator_name, __e->elevator_name)) { + if (elv && elevator_match(elv, __e->elevator_name) && + (__e->uses_mq == uses_mq)) { len += sprintf(name+len, "[%s] ", elv->elevator_name); continue; } diff --git a/block/genhd.c b/block/genhd.c index 630c0da..c2223f1 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -588,6 +588,11 @@ static void register_disk(struct device *parent, struct gendisk *disk) disk->part0.holder_dir = kobject_create_and_add("holders", &ddev->kobj); disk->slave_dir = kobject_create_and_add("slaves", &ddev->kobj); + if (disk->flags & GENHD_FL_HIDDEN) { + dev_set_uevent_suppress(ddev, 0); + return; + } + /* No minors to use for partitions */ if (!disk_part_scan_enabled(disk)) goto exit; @@ -616,6 +621,11 @@ exit: while ((part = disk_part_iter_next(&piter))) kobject_uevent(&part_to_dev(part)->kobj, KOBJ_ADD); disk_part_iter_exit(&piter); + + err = sysfs_create_link(&ddev->kobj, + &disk->queue->backing_dev_info->dev->kobj, + "bdi"); + WARN_ON(err); } /** @@ -630,7 +640,6 @@ exit: */ void device_add_disk(struct device *parent, struct gendisk *disk) { - struct backing_dev_info *bdi; dev_t devt; int retval; @@ -639,7 +648,8 @@ void device_add_disk(struct device *parent, struct gendisk *disk) * parameters make sense. */ WARN_ON(disk->minors && !(disk->major || disk->first_minor)); - WARN_ON(!disk->minors && !(disk->flags & GENHD_FL_EXT_DEVT)); + WARN_ON(!disk->minors && + !(disk->flags & (GENHD_FL_EXT_DEVT | GENHD_FL_HIDDEN))); disk->flags |= GENHD_FL_UP; @@ -648,22 +658,26 @@ void device_add_disk(struct device *parent, struct gendisk *disk) WARN_ON(1); return; } - disk_to_dev(disk)->devt = devt; - - /* ->major and ->first_minor aren't supposed to be - * dereferenced from here on, but set them just in case. - */ disk->major = MAJOR(devt); disk->first_minor = MINOR(devt); disk_alloc_events(disk); - /* Register BDI before referencing it from bdev */ - bdi = disk->queue->backing_dev_info; - bdi_register_owner(bdi, disk_to_dev(disk)); - - blk_register_region(disk_devt(disk), disk->minors, NULL, - exact_match, exact_lock, disk); + if (disk->flags & GENHD_FL_HIDDEN) { + /* + * Don't let hidden disks show up in /proc/partitions, + * and don't bother scanning for partitions either. + */ + disk->flags |= GENHD_FL_SUPPRESS_PARTITION_INFO; + disk->flags |= GENHD_FL_NO_PART_SCAN; + } else { + /* Register BDI before referencing it from bdev */ + disk_to_dev(disk)->devt = devt; + bdi_register_owner(disk->queue->backing_dev_info, + disk_to_dev(disk)); + blk_register_region(disk_devt(disk), disk->minors, NULL, + exact_match, exact_lock, disk); + } register_disk(parent, disk); blk_register_queue(disk); @@ -673,10 +687,6 @@ void device_add_disk(struct device *parent, struct gendisk *disk) */ WARN_ON_ONCE(!blk_get_queue(disk->queue)); - retval = sysfs_create_link(&disk_to_dev(disk)->kobj, &bdi->dev->kobj, - "bdi"); - WARN_ON(retval); - disk_add_events(disk); blk_integrity_add(disk); } @@ -705,7 +715,8 @@ void del_gendisk(struct gendisk *disk) set_capacity(disk, 0); disk->flags &= ~GENHD_FL_UP; - sysfs_remove_link(&disk_to_dev(disk)->kobj, "bdi"); + if (!(disk->flags & GENHD_FL_HIDDEN)) + sysfs_remove_link(&disk_to_dev(disk)->kobj, "bdi"); if (disk->queue) { /* * Unregister bdi before releasing device numbers (as they can @@ -716,13 +727,15 @@ void del_gendisk(struct gendisk *disk) } else { WARN_ON(1); } - blk_unregister_region(disk_devt(disk), disk->minors); - part_stat_set_all(&disk->part0, 0); - disk->part0.stamp = 0; + if (!(disk->flags & GENHD_FL_HIDDEN)) + blk_unregister_region(disk_devt(disk), disk->minors); kobject_put(disk->part0.holder_dir); kobject_put(disk->slave_dir); + + part_stat_set_all(&disk->part0, 0); + disk->part0.stamp = 0; if (!sysfs_deprecated) sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk))); pm_runtime_set_memalloc_noio(disk_to_dev(disk), false); @@ -785,6 +798,10 @@ struct gendisk *get_gendisk(dev_t devt, int *partno) spin_unlock_bh(&ext_devt_lock); } + if (disk && unlikely(disk->flags & GENHD_FL_HIDDEN)) { + put_disk(disk); + disk = NULL; + } return disk; } EXPORT_SYMBOL(get_gendisk); @@ -1028,6 +1045,15 @@ static ssize_t disk_removable_show(struct device *dev, (disk->flags & GENHD_FL_REMOVABLE ? 1 : 0)); } +static ssize_t disk_hidden_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct gendisk *disk = dev_to_disk(dev); + + return sprintf(buf, "%d\n", + (disk->flags & GENHD_FL_HIDDEN ? 1 : 0)); +} + static ssize_t disk_ro_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -1065,6 +1091,7 @@ static ssize_t disk_discard_alignment_show(struct device *dev, static DEVICE_ATTR(range, S_IRUGO, disk_range_show, NULL); static DEVICE_ATTR(ext_range, S_IRUGO, disk_ext_range_show, NULL); static DEVICE_ATTR(removable, S_IRUGO, disk_removable_show, NULL); +static DEVICE_ATTR(hidden, S_IRUGO, disk_hidden_show, NULL); static DEVICE_ATTR(ro, S_IRUGO, disk_ro_show, NULL); static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL); static DEVICE_ATTR(alignment_offset, S_IRUGO, disk_alignment_offset_show, NULL); @@ -1089,6 +1116,7 @@ static struct attribute *disk_attrs[] = { &dev_attr_range.attr, &dev_attr_ext_range.attr, &dev_attr_removable.attr, + &dev_attr_hidden.attr, &dev_attr_ro.attr, &dev_attr_size.attr, &dev_attr_alignment_offset.attr, diff --git a/block/ioctl.c b/block/ioctl.c index 0de02ee..1668506 100644 --- a/block/ioctl.c +++ b/block/ioctl.c @@ -202,10 +202,16 @@ static int blk_ioctl_discard(struct block_device *bdev, fmode_t mode, { uint64_t range[2]; uint64_t start, len; + struct request_queue *q = bdev_get_queue(bdev); + struct address_space *mapping = bdev->bd_inode->i_mapping; + if (!(mode & FMODE_WRITE)) return -EBADF; + if (!blk_queue_discard(q)) + return -EOPNOTSUPP; + if (copy_from_user(range, (void __user *)arg, sizeof(range))) return -EFAULT; @@ -216,12 +222,12 @@ static int blk_ioctl_discard(struct block_device *bdev, fmode_t mode, return -EINVAL; if (len & 511) return -EINVAL; - start >>= 9; - len >>= 9; - if (start + len > (i_size_read(bdev->bd_inode) >> 9)) + if (start + len > i_size_read(bdev->bd_inode)) return -EINVAL; - return blkdev_issue_discard(bdev, start, len, GFP_KERNEL, flags); + truncate_inode_pages_range(mapping, start, start + len); + return blkdev_issue_discard(bdev, start >> 9, len >> 9, + GFP_KERNEL, flags); } static int blk_ioctl_zeroout(struct block_device *bdev, fmode_t mode, @@ -437,11 +443,12 @@ static int blkdev_roset(struct block_device *bdev, fmode_t mode, { int ret, n; + if (!capable(CAP_SYS_ADMIN)) + return -EACCES; + ret = __blkdev_driver_ioctl(bdev, mode, cmd, arg); if (!is_unrecognized_ioctl(ret)) return ret; - if (!capable(CAP_SYS_ADMIN)) - return -EACCES; if (get_user(n, (int __user *)arg)) return -EFAULT; set_device_ro(bdev, n); diff --git a/block/kyber-iosched.c b/block/kyber-iosched.c index f58cab8..b4df317 100644 --- a/block/kyber-iosched.c +++ b/block/kyber-iosched.c @@ -541,9 +541,17 @@ static int kyber_get_domain_token(struct kyber_queue_data *kqd, /* * Try again in case a token was freed before we got on the wait - * queue. + * queue. The waker may have already removed the entry from the + * wait queue, but list_del_init() is okay with that. */ nr = __sbitmap_queue_get(domain_tokens); + if (nr >= 0) { + unsigned long flags; + + spin_lock_irqsave(&ws->wait.lock, flags); + list_del_init(&wait->entry); + spin_unlock_irqrestore(&ws->wait.lock, flags); + } } return nr; } @@ -641,7 +649,7 @@ static bool kyber_has_work(struct blk_mq_hw_ctx *hctx) if (!list_empty_careful(&khd->rqs[i])) return true; } - return false; + return sbitmap_any_bit_set(&hctx->ctx_map); } #define KYBER_LAT_SHOW_STORE(op) \ diff --git a/block/mq-deadline.c b/block/mq-deadline.c index a1cad43..0179e48 100644 --- a/block/mq-deadline.c +++ b/block/mq-deadline.c @@ -657,6 +657,7 @@ static struct elevator_type mq_deadline = { #endif .elevator_attrs = deadline_attrs, .elevator_name = "mq-deadline", + .elevator_alias = "deadline", .elevator_owner = THIS_MODULE, }; MODULE_ALIAS("mq-deadline-iosched"); diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c index 7440de4..edcfff9 100644 --- a/block/scsi_ioctl.c +++ b/block/scsi_ioctl.c @@ -207,7 +207,7 @@ static void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter) __set_bit(GPCMD_SET_READ_AHEAD, filter->write_ok); } -int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm) +int blk_verify_command(unsigned char *cmd, fmode_t mode) { struct blk_cmd_filter *filter = &blk_default_cmd_filter; @@ -220,7 +220,7 @@ int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm) return 0; /* Write-safe commands require a writable open */ - if (test_bit(cmd[0], filter->write_ok) && has_write_perm) + if (test_bit(cmd[0], filter->write_ok) && (mode & FMODE_WRITE)) return 0; return -EPERM; @@ -234,7 +234,7 @@ static int blk_fill_sghdr_rq(struct request_queue *q, struct request *rq, if (copy_from_user(req->cmd, hdr->cmdp, hdr->cmd_len)) return -EFAULT; - if (blk_verify_command(req->cmd, mode & FMODE_WRITE)) + if (blk_verify_command(req->cmd, mode)) return -EPERM; /* @@ -469,7 +469,7 @@ int sg_scsi_ioctl(struct request_queue *q, struct gendisk *disk, fmode_t mode, if (in_len && copy_from_user(buffer, sic->data + cmdlen, in_len)) goto error; - err = blk_verify_command(req->cmd, mode & FMODE_WRITE); + err = blk_verify_command(req->cmd, mode); if (err) goto error; diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig index 7b2df7a..923b417 100644 --- a/drivers/block/Kconfig +++ b/drivers/block/Kconfig @@ -68,9 +68,13 @@ config AMIGA_Z2RAM To compile this driver as a module, choose M here: the module will be called z2ram. +config CDROM + tristate + config GDROM tristate "SEGA Dreamcast GD-ROM drive" depends on SH_DREAMCAST + select CDROM select BLK_SCSI_REQUEST # only for the generic cdrom code help A standard SEGA Dreamcast comes with a modified CD ROM drive called a @@ -348,6 +352,7 @@ config BLK_DEV_RAM_DAX config CDROM_PKTCDVD tristate "Packet writing on CD/DVD media (DEPRECATED)" depends on !UML + select CDROM select BLK_SCSI_REQUEST help Note: This driver is deprecated and will be removed from the diff --git a/drivers/block/brd.c b/drivers/block/brd.c index 2d7178f..c1cf877 100644 --- a/drivers/block/brd.c +++ b/drivers/block/brd.c @@ -60,7 +60,6 @@ struct brd_device { /* * Look up and return a brd's page for a given sector. */ -static DEFINE_MUTEX(brd_mutex); static struct page *brd_lookup_page(struct brd_device *brd, sector_t sector) { pgoff_t idx; diff --git a/drivers/block/cryptoloop.c b/drivers/block/cryptoloop.c index 74e03aa..7033a4b 100644 --- a/drivers/block/cryptoloop.c +++ b/drivers/block/cryptoloop.c @@ -43,7 +43,6 @@ cryptoloop_init(struct loop_device *lo, const struct loop_info64 *info) int cipher_len; int mode_len; char cms[LO_NAME_SIZE]; /* cipher-mode string */ - char *cipher; char *mode; char *cmsp = cms; /* c-m string pointer */ struct crypto_skcipher *tfm; @@ -56,7 +55,6 @@ cryptoloop_init(struct loop_device *lo, const struct loop_info64 *info) strncpy(cms, info->lo_crypt_name, LO_NAME_SIZE); cms[LO_NAME_SIZE - 1] = 0; - cipher = cmsp; cipher_len = strcspn(cmsp, "-"); mode = cmsp + cipher_len; diff --git a/drivers/block/loop.c b/drivers/block/loop.c index 85de673..bc8e615 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -476,6 +476,8 @@ static void lo_rw_aio_complete(struct kiocb *iocb, long ret, long ret2) { struct loop_cmd *cmd = container_of(iocb, struct loop_cmd, iocb); + if (cmd->css) + css_put(cmd->css); cmd->ret = ret; lo_rw_aio_do_completion(cmd); } @@ -535,6 +537,8 @@ static int lo_rw_aio(struct loop_device *lo, struct loop_cmd *cmd, cmd->iocb.ki_filp = file; cmd->iocb.ki_complete = lo_rw_aio_complete; cmd->iocb.ki_flags = IOCB_DIRECT; + if (cmd->css) + kthread_associate_blkcg(cmd->css); if (rw == WRITE) ret = call_write_iter(file, &cmd->iocb, &iter); @@ -542,6 +546,7 @@ static int lo_rw_aio(struct loop_device *lo, struct loop_cmd *cmd, ret = call_read_iter(file, &cmd->iocb, &iter); lo_rw_aio_do_completion(cmd); + kthread_associate_blkcg(NULL); if (ret != -EIOCBQUEUED) cmd->iocb.ki_complete(&cmd->iocb, ret, 0); @@ -1686,6 +1691,14 @@ static blk_status_t loop_queue_rq(struct blk_mq_hw_ctx *hctx, break; } + /* always use the first bio's css */ +#ifdef CONFIG_BLK_CGROUP + if (cmd->use_aio && cmd->rq->bio && cmd->rq->bio->bi_css) { + cmd->css = cmd->rq->bio->bi_css; + css_get(cmd->css); + } else +#endif + cmd->css = NULL; kthread_queue_work(&lo->worker, &cmd->work); return BLK_STS_OK; diff --git a/drivers/block/loop.h b/drivers/block/loop.h index 1f39567..0f45416 100644 --- a/drivers/block/loop.h +++ b/drivers/block/loop.h @@ -72,6 +72,7 @@ struct loop_cmd { long ret; struct kiocb iocb; struct bio_vec *bvec; + struct cgroup_subsys_state *css; }; /* Support for loadable transfer modules */ diff --git a/drivers/block/mtip32xx/mtip32xx.c b/drivers/block/mtip32xx/mtip32xx.c index 4a3cfc7..b8af735 100644 --- a/drivers/block/mtip32xx/mtip32xx.c +++ b/drivers/block/mtip32xx/mtip32xx.c @@ -887,12 +887,9 @@ static void mtip_issue_non_ncq_command(struct mtip_port *port, int tag) static bool mtip_pause_ncq(struct mtip_port *port, struct host_to_dev_fis *fis) { - struct host_to_dev_fis *reply; unsigned long task_file_data; - reply = port->rxfis + RX_FIS_D2H_REG; task_file_data = readl(port->mmio+PORT_TFDATA); - if ((task_file_data & 1)) return false; @@ -1020,7 +1017,6 @@ static int mtip_exec_internal_command(struct mtip_port *port, .opts = opts }; int rv = 0; - unsigned long start; /* Make sure the buffer is 8 byte aligned. This is asic specific. */ if (buffer & 0x00000007) { @@ -1057,7 +1053,6 @@ static int mtip_exec_internal_command(struct mtip_port *port, /* Copy the command to the command table */ memcpy(int_cmd->command, fis, fis_len*4); - start = jiffies; rq->timeout = timeout; /* insert request and run queue */ @@ -3015,7 +3010,6 @@ static int mtip_hw_init(struct driver_data *dd) { int i; int rv; - unsigned int num_command_slots; unsigned long timeout, timetaken; dd->mmio = pcim_iomap_table(dd->pdev)[MTIP_ABAR]; @@ -3025,7 +3019,6 @@ static int mtip_hw_init(struct driver_data *dd) rv = -EIO; goto out1; } - num_command_slots = dd->slot_groups * 32; hba_setup(dd); diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c index 9adfb54..5f2a424 100644 --- a/drivers/block/nbd.c +++ b/drivers/block/nbd.c @@ -288,15 +288,6 @@ static enum blk_eh_timer_return nbd_xmit_timeout(struct request *req, cmd->status = BLK_STS_TIMEOUT; return BLK_EH_HANDLED; } - - /* If we are waiting on our dead timer then we could get timeout - * callbacks for our request. For this we just want to reset the timer - * and let the queue side take care of everything. - */ - if (!completion_done(&cmd->send_complete)) { - nbd_config_put(nbd); - return BLK_EH_RESET_TIMER; - } config = nbd->config; if (config->num_connections > 1) { @@ -723,9 +714,9 @@ static int wait_for_reconnect(struct nbd_device *nbd) return 0; if (test_bit(NBD_DISCONNECTED, &config->runtime_flags)) return 0; - wait_event_interruptible_timeout(config->conn_wait, - atomic_read(&config->live_connections), - config->dead_conn_timeout); + wait_event_timeout(config->conn_wait, + atomic_read(&config->live_connections), + config->dead_conn_timeout); return atomic_read(&config->live_connections); } @@ -740,6 +731,7 @@ static int nbd_handle_cmd(struct nbd_cmd *cmd, int index) if (!refcount_inc_not_zero(&nbd->config_refs)) { dev_err_ratelimited(disk_to_dev(nbd->disk), "Socks array is empty\n"); + blk_mq_start_request(req); return -EINVAL; } config = nbd->config; @@ -748,6 +740,7 @@ static int nbd_handle_cmd(struct nbd_cmd *cmd, int index) dev_err_ratelimited(disk_to_dev(nbd->disk), "Attempted send on invalid socket\n"); nbd_config_put(nbd); + blk_mq_start_request(req); return -EINVAL; } cmd->status = BLK_STS_OK; @@ -771,6 +764,7 @@ again: */ sock_shutdown(nbd); nbd_config_put(nbd); + blk_mq_start_request(req); return -EIO; } goto again; @@ -781,6 +775,7 @@ again: * here so that it gets put _after_ the request that is already on the * dispatch list. */ + blk_mq_start_request(req); if (unlikely(nsock->pending && nsock->pending != req)) { blk_mq_requeue_request(req, true); ret = 0; @@ -793,10 +788,10 @@ again: ret = nbd_send_cmd(nbd, cmd, index); if (ret == -EAGAIN) { dev_err_ratelimited(disk_to_dev(nbd->disk), - "Request send failed trying another connection\n"); + "Request send failed, requeueing\n"); nbd_mark_nsock_dead(nbd, nsock, 1); - mutex_unlock(&nsock->tx_lock); - goto again; + blk_mq_requeue_request(req, true); + ret = 0; } out: mutex_unlock(&nsock->tx_lock); @@ -820,7 +815,6 @@ static blk_status_t nbd_queue_rq(struct blk_mq_hw_ctx *hctx, * done sending everything over the wire. */ init_completion(&cmd->send_complete); - blk_mq_start_request(bd->rq); /* We can be called directly from the user space process, which means we * could possibly have signals pending so our sendmsg will fail. In diff --git a/drivers/block/null_blk.c b/drivers/block/null_blk.c index cda69db..c61960d 100644 --- a/drivers/block/null_blk.c +++ b/drivers/block/null_blk.c @@ -154,6 +154,10 @@ enum { NULL_Q_MQ = 2, }; +static int g_no_sched; +module_param_named(no_sched, g_no_sched, int, S_IRUGO); +MODULE_PARM_DESC(no_sched, "No io scheduler"); + static int g_submit_queues = 1; module_param_named(submit_queues, g_submit_queues, int, S_IRUGO); MODULE_PARM_DESC(submit_queues, "Number of submission queues"); @@ -1754,6 +1758,8 @@ static int null_init_tag_set(struct nullb *nullb, struct blk_mq_tag_set *set) set->numa_node = nullb ? nullb->dev->home_node : g_home_node; set->cmd_size = sizeof(struct nullb_cmd); set->flags = BLK_MQ_F_SHOULD_MERGE; + if (g_no_sched) + set->flags |= BLK_MQ_F_NO_SCHED; set->driver_data = NULL; if ((nullb && nullb->dev->blocking) || g_blocking) @@ -1985,8 +1991,10 @@ static int __init null_init(void) for (i = 0; i < nr_devices; i++) { dev = null_alloc_dev(); - if (!dev) + if (!dev) { + ret = -ENOMEM; goto err_dev; + } ret = null_add_dev(dev); if (ret) { null_free_dev(dev); diff --git a/drivers/block/paride/Kconfig b/drivers/block/paride/Kconfig index b226835a9..f8bd6ef 100644 --- a/drivers/block/paride/Kconfig +++ b/drivers/block/paride/Kconfig @@ -26,6 +26,7 @@ config PARIDE_PD config PARIDE_PCD tristate "Parallel port ATAPI CD-ROMs" depends on PARIDE + select CDROM select BLK_SCSI_REQUEST # only for the generic cdrom code ---help--- This option enables the high-level driver for ATAPI CD-ROM devices diff --git a/drivers/block/skd_main.c b/drivers/block/skd_main.c index 64d0fc1..2819f23 100644 --- a/drivers/block/skd_main.c +++ b/drivers/block/skd_main.c @@ -1967,7 +1967,8 @@ static void skd_isr_msg_from_dev(struct skd_device *skdev) break; case FIT_MTD_CMD_LOG_HOST_ID: - skdev->connect_time_stamp = get_seconds(); + /* hardware interface overflows in y2106 */ + skdev->connect_time_stamp = (u32)ktime_get_real_seconds(); data = skdev->connect_time_stamp & 0xFFFF; mtd = FIT_MXD_CONS(FIT_MTD_CMD_LOG_TIME_STAMP_LO, 0, data); SKD_WRITEL(skdev, mtd, FIT_MSG_TO_DEVICE); diff --git a/drivers/cdrom/Makefile b/drivers/cdrom/Makefile index a95566f..0f3664b 100644 --- a/drivers/cdrom/Makefile +++ b/drivers/cdrom/Makefile @@ -1,14 +1,3 @@ # SPDX-License-Identifier: GPL-2.0 -# Makefile for the kernel cdrom device drivers. -# -# 30 Jan 1998, Michael Elizabeth Chastain, <mailto:mec@shout.net> -# Rewritten to use lists instead of if-statements. - -# Each configuration option enables a list of files. - -obj-$(CONFIG_BLK_DEV_IDECD) += cdrom.o -obj-$(CONFIG_BLK_DEV_SR) += cdrom.o -obj-$(CONFIG_PARIDE_PCD) += cdrom.o -obj-$(CONFIG_CDROM_PKTCDVD) += cdrom.o - -obj-$(CONFIG_GDROM) += gdrom.o cdrom.o +obj-$(CONFIG_CDROM) += cdrom.o +obj-$(CONFIG_GDROM) += gdrom.o diff --git a/drivers/ide/Kconfig b/drivers/ide/Kconfig index c99a25c..cf1fb3f 100644 --- a/drivers/ide/Kconfig +++ b/drivers/ide/Kconfig @@ -117,7 +117,9 @@ config BLK_DEV_DELKIN config BLK_DEV_IDECD tristate "Include IDE/ATAPI CDROM support" + depends on BLK_DEV select IDE_ATAPI + select CDROM ---help--- If you have a CD-ROM drive using the ATAPI protocol, say Y. ATAPI is a newer protocol used by IDE CD-ROM and TAPE drives, similar to the diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c index 14d1e7d..0e6bc63 100644 --- a/drivers/ide/ide-atapi.c +++ b/drivers/ide/ide-atapi.c @@ -282,7 +282,7 @@ int ide_cd_expiry(ide_drive_t *drive) struct request *rq = drive->hwif->rq; unsigned long wait = 0; - debug_log("%s: rq->cmd[0]: 0x%x\n", __func__, rq->cmd[0]); + debug_log("%s: scsi_req(rq)->cmd[0]: 0x%x\n", __func__, scsi_req(rq)->cmd[0]); /* * Some commands are *slow* and normally take a long time to complete. @@ -463,7 +463,7 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive) return ide_do_reset(drive); } - debug_log("[cmd %x]: check condition\n", rq->cmd[0]); + debug_log("[cmd %x]: check condition\n", scsi_req(rq)->cmd[0]); /* Retry operation */ ide_retry_pc(drive); @@ -531,7 +531,7 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive) ide_pad_transfer(drive, write, bcount); debug_log("[cmd %x] transferred %d bytes, padded %d bytes, resid: %u\n", - rq->cmd[0], done, bcount, scsi_req(rq)->resid_len); + scsi_req(rq)->cmd[0], done, bcount, scsi_req(rq)->resid_len); /* And set the interrupt handler again */ ide_set_handler(drive, ide_pc_intr, timeout); diff --git a/drivers/ide/ide-pm.c b/drivers/ide/ide-pm.c index dccdca9..ad8a125 100644 --- a/drivers/ide/ide-pm.c +++ b/drivers/ide/ide-pm.c @@ -90,9 +90,9 @@ int generic_ide_resume(struct device *dev) } memset(&rqpm, 0, sizeof(rqpm)); - rq = blk_get_request(drive->queue, REQ_OP_DRV_IN, __GFP_RECLAIM); + rq = blk_get_request_flags(drive->queue, REQ_OP_DRV_IN, + BLK_MQ_REQ_PREEMPT); ide_req(rq)->type = ATA_PRIV_PM_RESUME; - rq->rq_flags |= RQF_PREEMPT; rq->special = &rqpm; rqpm.pm_step = IDE_PM_START_RESUME; rqpm.pm_state = PM_EVENT_ON; diff --git a/drivers/lightnvm/Kconfig b/drivers/lightnvm/Kconfig index ead61a9..2a953ef 100644 --- a/drivers/lightnvm/Kconfig +++ b/drivers/lightnvm/Kconfig @@ -4,7 +4,8 @@ menuconfig NVM bool "Open-Channel SSD target support" - depends on BLOCK && HAS_DMA + depends on BLOCK && HAS_DMA && PCI + select BLK_DEV_NVME help Say Y here to get to enable Open-channel SSDs. diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c index ddae430..83249b4 100644 --- a/drivers/lightnvm/core.c +++ b/drivers/lightnvm/core.c @@ -22,6 +22,7 @@ #include <linux/types.h> #include <linux/sem.h> #include <linux/bitmap.h> +#include <linux/module.h> #include <linux/moduleparam.h> #include <linux/miscdevice.h> #include <linux/lightnvm.h> @@ -138,7 +139,6 @@ static struct nvm_tgt_dev *nvm_create_tgt_dev(struct nvm_dev *dev, int prev_nr_luns; int i, j; - nr_chnls = nr_luns / dev->geo.luns_per_chnl; nr_chnls = (nr_chnls_mod == 0) ? nr_chnls : nr_chnls + 1; dev_map = kmalloc(sizeof(struct nvm_dev_map), GFP_KERNEL); @@ -226,6 +226,24 @@ static const struct block_device_operations nvm_fops = { .owner = THIS_MODULE, }; +static struct nvm_tgt_type *nvm_find_target_type(const char *name, int lock) +{ + struct nvm_tgt_type *tmp, *tt = NULL; + + if (lock) + down_write(&nvm_tgtt_lock); + + list_for_each_entry(tmp, &nvm_tgt_types, list) + if (!strcmp(name, tmp->name)) { + tt = tmp; + break; + } + + if (lock) + up_write(&nvm_tgtt_lock); + return tt; +} + static int nvm_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create) { struct nvm_ioctl_create_simple *s = &create->conf.s; @@ -316,6 +334,8 @@ static int nvm_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create) list_add_tail(&t->list, &dev->targets); mutex_unlock(&dev->mlock); + __module_get(tt->owner); + return 0; err_sysfs: if (tt->exit) @@ -351,6 +371,7 @@ static void __nvm_remove_target(struct nvm_target *t) nvm_remove_tgt_dev(t->dev, 1); put_disk(tdisk); + module_put(t->type->owner); list_del(&t->list); kfree(t); @@ -532,25 +553,6 @@ void nvm_part_to_tgt(struct nvm_dev *dev, sector_t *entries, } EXPORT_SYMBOL(nvm_part_to_tgt); -struct nvm_tgt_type *nvm_find_target_type(const char *name, int lock) -{ - struct nvm_tgt_type *tmp, *tt = NULL; - - if (lock) - down_write(&nvm_tgtt_lock); - - list_for_each_entry(tmp, &nvm_tgt_types, list) - if (!strcmp(name, tmp->name)) { - tt = tmp; - break; - } - - if (lock) - up_write(&nvm_tgtt_lock); - return tt; -} -EXPORT_SYMBOL(nvm_find_target_type); - int nvm_register_tgt_type(struct nvm_tgt_type *tt) { int ret = 0; @@ -571,9 +573,9 @@ void nvm_unregister_tgt_type(struct nvm_tgt_type *tt) if (!tt) return; - down_write(&nvm_lock); + down_write(&nvm_tgtt_lock); list_del(&tt->list); - up_write(&nvm_lock); + up_write(&nvm_tgtt_lock); } EXPORT_SYMBOL(nvm_unregister_tgt_type); @@ -602,6 +604,52 @@ static struct nvm_dev *nvm_find_nvm_dev(const char *name) return NULL; } +static int nvm_set_rqd_ppalist(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd, + const struct ppa_addr *ppas, int nr_ppas) +{ + struct nvm_dev *dev = tgt_dev->parent; + struct nvm_geo *geo = &tgt_dev->geo; + int i, plane_cnt, pl_idx; + struct ppa_addr ppa; + + if (geo->plane_mode == NVM_PLANE_SINGLE && nr_ppas == 1) { + rqd->nr_ppas = nr_ppas; + rqd->ppa_addr = ppas[0]; + + return 0; + } + + rqd->nr_ppas = nr_ppas; + rqd->ppa_list = nvm_dev_dma_alloc(dev, GFP_KERNEL, &rqd->dma_ppa_list); + if (!rqd->ppa_list) { + pr_err("nvm: failed to allocate dma memory\n"); + return -ENOMEM; + } + + plane_cnt = geo->plane_mode; + rqd->nr_ppas *= plane_cnt; + + for (i = 0; i < nr_ppas; i++) { + for (pl_idx = 0; pl_idx < plane_cnt; pl_idx++) { + ppa = ppas[i]; + ppa.g.pl = pl_idx; + rqd->ppa_list[(pl_idx * nr_ppas) + i] = ppa; + } + } + + return 0; +} + +static void nvm_free_rqd_ppalist(struct nvm_tgt_dev *tgt_dev, + struct nvm_rq *rqd) +{ + if (!rqd->ppa_list) + return; + + nvm_dev_dma_free(tgt_dev->parent, rqd->ppa_list, rqd->dma_ppa_list); +} + + int nvm_set_tgt_bb_tbl(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *ppas, int nr_ppas, int type) { @@ -616,7 +664,7 @@ int nvm_set_tgt_bb_tbl(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *ppas, memset(&rqd, 0, sizeof(struct nvm_rq)); - nvm_set_rqd_ppalist(tgt_dev, &rqd, ppas, nr_ppas, 1); + nvm_set_rqd_ppalist(tgt_dev, &rqd, ppas, nr_ppas); nvm_rq_tgt_to_dev(tgt_dev, &rqd); ret = dev->ops->set_bb_tbl(dev, &rqd.ppa_addr, rqd.nr_ppas, type); @@ -658,12 +706,25 @@ int nvm_submit_io(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd) } EXPORT_SYMBOL(nvm_submit_io); -static void nvm_end_io_sync(struct nvm_rq *rqd) +int nvm_submit_io_sync(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd) { - struct completion *waiting = rqd->private; + struct nvm_dev *dev = tgt_dev->parent; + int ret; - complete(waiting); + if (!dev->ops->submit_io_sync) + return -ENODEV; + + nvm_rq_tgt_to_dev(tgt_dev, rqd); + + rqd->dev = tgt_dev; + + /* In case of error, fail with right address format */ + ret = dev->ops->submit_io_sync(dev, rqd); + nvm_rq_dev_to_tgt(tgt_dev, rqd); + + return ret; } +EXPORT_SYMBOL(nvm_submit_io_sync); int nvm_erase_sync(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *ppas, int nr_ppas) @@ -671,25 +732,21 @@ int nvm_erase_sync(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *ppas, struct nvm_geo *geo = &tgt_dev->geo; struct nvm_rq rqd; int ret; - DECLARE_COMPLETION_ONSTACK(wait); memset(&rqd, 0, sizeof(struct nvm_rq)); rqd.opcode = NVM_OP_ERASE; - rqd.end_io = nvm_end_io_sync; - rqd.private = &wait; rqd.flags = geo->plane_mode >> 1; - ret = nvm_set_rqd_ppalist(tgt_dev, &rqd, ppas, nr_ppas, 1); + ret = nvm_set_rqd_ppalist(tgt_dev, &rqd, ppas, nr_ppas); if (ret) return ret; - ret = nvm_submit_io(tgt_dev, &rqd); + ret = nvm_submit_io_sync(tgt_dev, &rqd); if (ret) { pr_err("rrpr: erase I/O submission failed: %d\n", ret); goto free_ppa_list; } - wait_for_completion_io(&wait); free_ppa_list: nvm_free_rqd_ppalist(tgt_dev, &rqd); @@ -775,57 +832,6 @@ void nvm_put_area(struct nvm_tgt_dev *tgt_dev, sector_t begin) } EXPORT_SYMBOL(nvm_put_area); -int nvm_set_rqd_ppalist(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd, - const struct ppa_addr *ppas, int nr_ppas, int vblk) -{ - struct nvm_dev *dev = tgt_dev->parent; - struct nvm_geo *geo = &tgt_dev->geo; - int i, plane_cnt, pl_idx; - struct ppa_addr ppa; - - if ((!vblk || geo->plane_mode == NVM_PLANE_SINGLE) && nr_ppas == 1) { - rqd->nr_ppas = nr_ppas; - rqd->ppa_addr = ppas[0]; - - return 0; - } - - rqd->nr_ppas = nr_ppas; - rqd->ppa_list = nvm_dev_dma_alloc(dev, GFP_KERNEL, &rqd->dma_ppa_list); - if (!rqd->ppa_list) { - pr_err("nvm: failed to allocate dma memory\n"); - return -ENOMEM; - } - - if (!vblk) { - for (i = 0; i < nr_ppas; i++) - rqd->ppa_list[i] = ppas[i]; - } else { - plane_cnt = geo->plane_mode; - rqd->nr_ppas *= plane_cnt; - - for (i = 0; i < nr_ppas; i++) { - for (pl_idx = 0; pl_idx < plane_cnt; pl_idx++) { - ppa = ppas[i]; - ppa.g.pl = pl_idx; - rqd->ppa_list[(pl_idx * nr_ppas) + i] = ppa; - } - } - } - - return 0; -} -EXPORT_SYMBOL(nvm_set_rqd_ppalist); - -void nvm_free_rqd_ppalist(struct nvm_tgt_dev *tgt_dev, struct nvm_rq *rqd) -{ - if (!rqd->ppa_list) - return; - - nvm_dev_dma_free(tgt_dev->parent, rqd->ppa_list, rqd->dma_ppa_list); -} -EXPORT_SYMBOL(nvm_free_rqd_ppalist); - void nvm_end_io(struct nvm_rq *rqd) { struct nvm_tgt_dev *tgt_dev = rqd->dev; @@ -1177,7 +1183,7 @@ static long nvm_ioctl_info(struct file *file, void __user *arg) info->version[1] = NVM_VERSION_MINOR; info->version[2] = NVM_VERSION_PATCH; - down_write(&nvm_lock); + down_write(&nvm_tgtt_lock); list_for_each_entry(tt, &nvm_tgt_types, list) { struct nvm_ioctl_info_tgt *tgt = &info->tgts[tgt_iter]; @@ -1190,7 +1196,7 @@ static long nvm_ioctl_info(struct file *file, void __user *arg) } info->tgtsize = tgt_iter; - up_write(&nvm_lock); + up_write(&nvm_tgtt_lock); if (copy_to_user(arg, info, sizeof(struct nvm_ioctl_info))) { kfree(info); diff --git a/drivers/lightnvm/pblk-cache.c b/drivers/lightnvm/pblk-cache.c index 024a8fc..0d227ef 100644 --- a/drivers/lightnvm/pblk-cache.c +++ b/drivers/lightnvm/pblk-cache.c @@ -43,8 +43,10 @@ retry: if (unlikely(!bio_has_data(bio))) goto out; - w_ctx.flags = flags; pblk_ppa_set_empty(&w_ctx.ppa); + w_ctx.flags = flags; + if (bio->bi_opf & REQ_PREFLUSH) + w_ctx.flags |= PBLK_FLUSH_ENTRY; for (i = 0; i < nr_entries; i++) { void *data = bio_data(bio); @@ -73,12 +75,11 @@ out: * On GC the incoming lbas are not necessarily sequential. Also, some of the * lbas might not be valid entries, which are marked as empty by the GC thread */ -int pblk_write_gc_to_cache(struct pblk *pblk, void *data, u64 *lba_list, - unsigned int nr_entries, unsigned int nr_rec_entries, - struct pblk_line *gc_line, unsigned long flags) +int pblk_write_gc_to_cache(struct pblk *pblk, struct pblk_gc_rq *gc_rq) { struct pblk_w_ctx w_ctx; unsigned int bpos, pos; + void *data = gc_rq->data; int i, valid_entries; /* Update the write buffer head (mem) with the entries that we can @@ -86,28 +87,29 @@ int pblk_write_gc_to_cache(struct pblk *pblk, void *data, u64 *lba_list, * rollback from here on. */ retry: - if (!pblk_rb_may_write_gc(&pblk->rwb, nr_rec_entries, &bpos)) { + if (!pblk_rb_may_write_gc(&pblk->rwb, gc_rq->secs_to_gc, &bpos)) { io_schedule(); goto retry; } - w_ctx.flags = flags; + w_ctx.flags = PBLK_IOTYPE_GC; pblk_ppa_set_empty(&w_ctx.ppa); - for (i = 0, valid_entries = 0; i < nr_entries; i++) { - if (lba_list[i] == ADDR_EMPTY) + for (i = 0, valid_entries = 0; i < gc_rq->nr_secs; i++) { + if (gc_rq->lba_list[i] == ADDR_EMPTY) continue; - w_ctx.lba = lba_list[i]; + w_ctx.lba = gc_rq->lba_list[i]; pos = pblk_rb_wrap_pos(&pblk->rwb, bpos + valid_entries); - pblk_rb_write_entry_gc(&pblk->rwb, data, w_ctx, gc_line, pos); + pblk_rb_write_entry_gc(&pblk->rwb, data, w_ctx, gc_rq->line, + gc_rq->paddr_list[i], pos); data += PBLK_EXPOSED_PAGE_SIZE; valid_entries++; } - WARN_ONCE(nr_rec_entries != valid_entries, + WARN_ONCE(gc_rq->secs_to_gc != valid_entries, "pblk: inconsistent GC write\n"); #ifdef CONFIG_NVM_DEBUG diff --git a/drivers/lightnvm/pblk-core.c b/drivers/lightnvm/pblk-core.c index 8150164..ce90213 100644 --- a/drivers/lightnvm/pblk-core.c +++ b/drivers/lightnvm/pblk-core.c @@ -18,6 +18,31 @@ #include "pblk.h" +static void pblk_line_mark_bb(struct work_struct *work) +{ + struct pblk_line_ws *line_ws = container_of(work, struct pblk_line_ws, + ws); + struct pblk *pblk = line_ws->pblk; + struct nvm_tgt_dev *dev = pblk->dev; + struct ppa_addr *ppa = line_ws->priv; + int ret; + + ret = nvm_set_tgt_bb_tbl(dev, ppa, 1, NVM_BLK_T_GRWN_BAD); + if (ret) { + struct pblk_line *line; + int pos; + + line = &pblk->lines[pblk_dev_ppa_to_line(*ppa)]; + pos = pblk_dev_ppa_to_pos(&dev->geo, *ppa); + + pr_err("pblk: failed to mark bb, line:%d, pos:%d\n", + line->id, pos); + } + + kfree(ppa); + mempool_free(line_ws, pblk->gen_ws_pool); +} + static void pblk_mark_bb(struct pblk *pblk, struct pblk_line *line, struct ppa_addr *ppa) { @@ -33,7 +58,8 @@ static void pblk_mark_bb(struct pblk *pblk, struct pblk_line *line, pr_err("pblk: attempted to erase bb: line:%d, pos:%d\n", line->id, pos); - pblk_line_run_ws(pblk, NULL, ppa, pblk_line_mark_bb, pblk->bb_wq); + pblk_gen_run_ws(pblk, NULL, ppa, pblk_line_mark_bb, + GFP_ATOMIC, pblk->bb_wq); } static void __pblk_end_io_erase(struct pblk *pblk, struct nvm_rq *rqd) @@ -63,7 +89,7 @@ static void pblk_end_io_erase(struct nvm_rq *rqd) struct pblk *pblk = rqd->private; __pblk_end_io_erase(pblk, rqd); - mempool_free(rqd, pblk->g_rq_pool); + mempool_free(rqd, pblk->e_rq_pool); } void __pblk_map_invalidate(struct pblk *pblk, struct pblk_line *line, @@ -77,11 +103,7 @@ void __pblk_map_invalidate(struct pblk *pblk, struct pblk_line *line, * that newer updates are not overwritten. */ spin_lock(&line->lock); - if (line->state == PBLK_LINESTATE_GC || - line->state == PBLK_LINESTATE_FREE) { - spin_unlock(&line->lock); - return; - } + WARN_ON(line->state == PBLK_LINESTATE_FREE); if (test_and_set_bit(paddr, line->invalid_bitmap)) { WARN_ONCE(1, "pblk: double invalidate\n"); @@ -98,8 +120,7 @@ void __pblk_map_invalidate(struct pblk *pblk, struct pblk_line *line, spin_lock(&l_mg->gc_lock); spin_lock(&line->lock); /* Prevent moving a line that has just been chosen for GC */ - if (line->state == PBLK_LINESTATE_GC || - line->state == PBLK_LINESTATE_FREE) { + if (line->state == PBLK_LINESTATE_GC) { spin_unlock(&line->lock); spin_unlock(&l_mg->gc_lock); return; @@ -150,17 +171,25 @@ static void pblk_invalidate_range(struct pblk *pblk, sector_t slba, spin_unlock(&pblk->trans_lock); } -struct nvm_rq *pblk_alloc_rqd(struct pblk *pblk, int rw) +/* Caller must guarantee that the request is a valid type */ +struct nvm_rq *pblk_alloc_rqd(struct pblk *pblk, int type) { mempool_t *pool; struct nvm_rq *rqd; int rq_size; - if (rw == WRITE) { + switch (type) { + case PBLK_WRITE: + case PBLK_WRITE_INT: pool = pblk->w_rq_pool; rq_size = pblk_w_rq_size; - } else { - pool = pblk->g_rq_pool; + break; + case PBLK_READ: + pool = pblk->r_rq_pool; + rq_size = pblk_g_rq_size; + break; + default: + pool = pblk->e_rq_pool; rq_size = pblk_g_rq_size; } @@ -170,15 +199,30 @@ struct nvm_rq *pblk_alloc_rqd(struct pblk *pblk, int rw) return rqd; } -void pblk_free_rqd(struct pblk *pblk, struct nvm_rq *rqd, int rw) +/* Typically used on completion path. Cannot guarantee request consistency */ +void pblk_free_rqd(struct pblk *pblk, struct nvm_rq *rqd, int type) { + struct nvm_tgt_dev *dev = pblk->dev; mempool_t *pool; - if (rw == WRITE) + switch (type) { + case PBLK_WRITE: + kfree(((struct pblk_c_ctx *)nvm_rq_to_pdu(rqd))->lun_bitmap); + case PBLK_WRITE_INT: pool = pblk->w_rq_pool; - else - pool = pblk->g_rq_pool; + break; + case PBLK_READ: + pool = pblk->r_rq_pool; + break; + case PBLK_ERASE: + pool = pblk->e_rq_pool; + break; + default: + pr_err("pblk: trying to free unknown rqd type\n"); + return; + } + nvm_dev_dma_free(dev->parent, rqd->meta_list, rqd->dma_meta_list); mempool_free(rqd, pool); } @@ -190,10 +234,9 @@ void pblk_bio_free_pages(struct pblk *pblk, struct bio *bio, int off, WARN_ON(off + nr_pages != bio->bi_vcnt); - bio_advance(bio, off * PBLK_EXPOSED_PAGE_SIZE); for (i = off; i < nr_pages + off; i++) { bv = bio->bi_io_vec[i]; - mempool_free(bv.bv_page, pblk->page_pool); + mempool_free(bv.bv_page, pblk->page_bio_pool); } } @@ -205,14 +248,12 @@ int pblk_bio_add_pages(struct pblk *pblk, struct bio *bio, gfp_t flags, int i, ret; for (i = 0; i < nr_pages; i++) { - page = mempool_alloc(pblk->page_pool, flags); - if (!page) - goto err; + page = mempool_alloc(pblk->page_bio_pool, flags); ret = bio_add_pc_page(q, bio, page, PBLK_EXPOSED_PAGE_SIZE, 0); if (ret != PBLK_EXPOSED_PAGE_SIZE) { pr_err("pblk: could not add page to bio\n"); - mempool_free(page, pblk->page_pool); + mempool_free(page, pblk->page_bio_pool); goto err; } } @@ -245,13 +286,6 @@ void pblk_write_should_kick(struct pblk *pblk) pblk_write_kick(pblk); } -void pblk_end_bio_sync(struct bio *bio) -{ - struct completion *waiting = bio->bi_private; - - complete(waiting); -} - void pblk_end_io_sync(struct nvm_rq *rqd) { struct completion *waiting = rqd->private; @@ -259,7 +293,7 @@ void pblk_end_io_sync(struct nvm_rq *rqd) complete(waiting); } -void pblk_wait_for_meta(struct pblk *pblk) +static void pblk_wait_for_meta(struct pblk *pblk) { do { if (!atomic_read(&pblk->inflight_io)) @@ -336,17 +370,6 @@ void pblk_discard(struct pblk *pblk, struct bio *bio) pblk_invalidate_range(pblk, slba, nr_secs); } -struct ppa_addr pblk_get_lba_map(struct pblk *pblk, sector_t lba) -{ - struct ppa_addr ppa; - - spin_lock(&pblk->trans_lock); - ppa = pblk_trans_map_get(pblk, lba); - spin_unlock(&pblk->trans_lock); - - return ppa; -} - void pblk_log_write_err(struct pblk *pblk, struct nvm_rq *rqd) { atomic_long_inc(&pblk->write_failed); @@ -389,39 +412,38 @@ int pblk_submit_io(struct pblk *pblk, struct nvm_rq *rqd) struct nvm_tgt_dev *dev = pblk->dev; #ifdef CONFIG_NVM_DEBUG - struct ppa_addr *ppa_list; + int ret; - ppa_list = (rqd->nr_ppas > 1) ? rqd->ppa_list : &rqd->ppa_addr; - if (pblk_boundary_ppa_checks(dev, ppa_list, rqd->nr_ppas)) { - WARN_ON(1); - return -EINVAL; - } + ret = pblk_check_io(pblk, rqd); + if (ret) + return ret; +#endif - if (rqd->opcode == NVM_OP_PWRITE) { - struct pblk_line *line; - struct ppa_addr ppa; - int i; + atomic_inc(&pblk->inflight_io); - for (i = 0; i < rqd->nr_ppas; i++) { - ppa = ppa_list[i]; - line = &pblk->lines[pblk_dev_ppa_to_line(ppa)]; + return nvm_submit_io(dev, rqd); +} - spin_lock(&line->lock); - if (line->state != PBLK_LINESTATE_OPEN) { - pr_err("pblk: bad ppa: line:%d,state:%d\n", - line->id, line->state); - WARN_ON(1); - spin_unlock(&line->lock); - return -EINVAL; - } - spin_unlock(&line->lock); - } - } +int pblk_submit_io_sync(struct pblk *pblk, struct nvm_rq *rqd) +{ + struct nvm_tgt_dev *dev = pblk->dev; + +#ifdef CONFIG_NVM_DEBUG + int ret; + + ret = pblk_check_io(pblk, rqd); + if (ret) + return ret; #endif atomic_inc(&pblk->inflight_io); - return nvm_submit_io(dev, rqd); + return nvm_submit_io_sync(dev, rqd); +} + +static void pblk_bio_map_addr_endio(struct bio *bio) +{ + bio_put(bio); } struct bio *pblk_bio_map_addr(struct pblk *pblk, void *data, @@ -460,6 +482,8 @@ struct bio *pblk_bio_map_addr(struct pblk *pblk, void *data, kaddr += PAGE_SIZE; } + + bio->bi_end_io = pblk_bio_map_addr_endio; out: return bio; } @@ -486,12 +510,14 @@ void pblk_dealloc_page(struct pblk *pblk, struct pblk_line *line, int nr_secs) u64 addr; int i; + spin_lock(&line->lock); addr = find_next_zero_bit(line->map_bitmap, pblk->lm.sec_per_line, line->cur_sec); line->cur_sec = addr - nr_secs; for (i = 0; i < nr_secs; i++, line->cur_sec--) WARN_ON(!test_and_clear_bit(line->cur_sec, line->map_bitmap)); + spin_unlock(&line->lock); } u64 __pblk_alloc_page(struct pblk *pblk, struct pblk_line *line, int nr_secs) @@ -565,12 +591,11 @@ static int pblk_line_submit_emeta_io(struct pblk *pblk, struct pblk_line *line, int cmd_op, bio_op; int i, j; int ret; - DECLARE_COMPLETION_ONSTACK(wait); - if (dir == WRITE) { + if (dir == PBLK_WRITE) { bio_op = REQ_OP_WRITE; cmd_op = NVM_OP_PWRITE; - } else if (dir == READ) { + } else if (dir == PBLK_READ) { bio_op = REQ_OP_READ; cmd_op = NVM_OP_PREAD; } else @@ -607,13 +632,11 @@ next_rq: rqd.dma_ppa_list = dma_ppa_list; rqd.opcode = cmd_op; rqd.nr_ppas = rq_ppas; - rqd.end_io = pblk_end_io_sync; - rqd.private = &wait; - if (dir == WRITE) { + if (dir == PBLK_WRITE) { struct pblk_sec_meta *meta_list = rqd.meta_list; - rqd.flags = pblk_set_progr_mode(pblk, WRITE); + rqd.flags = pblk_set_progr_mode(pblk, PBLK_WRITE); for (i = 0; i < rqd.nr_ppas; ) { spin_lock(&line->lock); paddr = __pblk_alloc_page(pblk, line, min); @@ -662,25 +685,17 @@ next_rq: } } - ret = pblk_submit_io(pblk, &rqd); + ret = pblk_submit_io_sync(pblk, &rqd); if (ret) { pr_err("pblk: emeta I/O submission failed: %d\n", ret); bio_put(bio); goto free_rqd_dma; } - if (!wait_for_completion_io_timeout(&wait, - msecs_to_jiffies(PBLK_COMMAND_TIMEOUT_MS))) { - pr_err("pblk: emeta I/O timed out\n"); - } atomic_dec(&pblk->inflight_io); - reinit_completion(&wait); - - if (likely(pblk->l_mg.emeta_alloc_type == PBLK_VMALLOC_META)) - bio_put(bio); if (rqd.error) { - if (dir == WRITE) + if (dir == PBLK_WRITE) pblk_log_write_err(pblk, &rqd); else pblk_log_read_err(pblk, &rqd); @@ -721,14 +736,13 @@ static int pblk_line_submit_smeta_io(struct pblk *pblk, struct pblk_line *line, int i, ret; int cmd_op, bio_op; int flags; - DECLARE_COMPLETION_ONSTACK(wait); - if (dir == WRITE) { + if (dir == PBLK_WRITE) { bio_op = REQ_OP_WRITE; cmd_op = NVM_OP_PWRITE; - flags = pblk_set_progr_mode(pblk, WRITE); + flags = pblk_set_progr_mode(pblk, PBLK_WRITE); lba_list = emeta_to_lbas(pblk, line->emeta->buf); - } else if (dir == READ) { + } else if (dir == PBLK_READ) { bio_op = REQ_OP_READ; cmd_op = NVM_OP_PREAD; flags = pblk_set_read_mode(pblk, PBLK_READ_SEQUENTIAL); @@ -758,15 +772,13 @@ static int pblk_line_submit_smeta_io(struct pblk *pblk, struct pblk_line *line, rqd.opcode = cmd_op; rqd.flags = flags; rqd.nr_ppas = lm->smeta_sec; - rqd.end_io = pblk_end_io_sync; - rqd.private = &wait; for (i = 0; i < lm->smeta_sec; i++, paddr++) { struct pblk_sec_meta *meta_list = rqd.meta_list; rqd.ppa_list[i] = addr_to_gen_ppa(pblk, paddr, line->id); - if (dir == WRITE) { + if (dir == PBLK_WRITE) { __le64 addr_empty = cpu_to_le64(ADDR_EMPTY); meta_list[i].lba = lba_list[paddr] = addr_empty; @@ -778,21 +790,17 @@ static int pblk_line_submit_smeta_io(struct pblk *pblk, struct pblk_line *line, * the write thread is the only one sending write and erase commands, * there is no need to take the LUN semaphore. */ - ret = pblk_submit_io(pblk, &rqd); + ret = pblk_submit_io_sync(pblk, &rqd); if (ret) { pr_err("pblk: smeta I/O submission failed: %d\n", ret); bio_put(bio); goto free_ppa_list; } - if (!wait_for_completion_io_timeout(&wait, - msecs_to_jiffies(PBLK_COMMAND_TIMEOUT_MS))) { - pr_err("pblk: smeta I/O timed out\n"); - } atomic_dec(&pblk->inflight_io); if (rqd.error) { - if (dir == WRITE) + if (dir == PBLK_WRITE) pblk_log_write_err(pblk, &rqd); else pblk_log_read_err(pblk, &rqd); @@ -808,14 +816,14 @@ int pblk_line_read_smeta(struct pblk *pblk, struct pblk_line *line) { u64 bpaddr = pblk_line_smeta_start(pblk, line); - return pblk_line_submit_smeta_io(pblk, line, bpaddr, READ); + return pblk_line_submit_smeta_io(pblk, line, bpaddr, PBLK_READ); } int pblk_line_read_emeta(struct pblk *pblk, struct pblk_line *line, void *emeta_buf) { return pblk_line_submit_emeta_io(pblk, line, emeta_buf, - line->emeta_ssec, READ); + line->emeta_ssec, PBLK_READ); } static void pblk_setup_e_rq(struct pblk *pblk, struct nvm_rq *rqd, @@ -824,7 +832,7 @@ static void pblk_setup_e_rq(struct pblk *pblk, struct nvm_rq *rqd, rqd->opcode = NVM_OP_ERASE; rqd->ppa_addr = ppa; rqd->nr_ppas = 1; - rqd->flags = pblk_set_progr_mode(pblk, ERASE); + rqd->flags = pblk_set_progr_mode(pblk, PBLK_ERASE); rqd->bio = NULL; } @@ -832,19 +840,15 @@ static int pblk_blk_erase_sync(struct pblk *pblk, struct ppa_addr ppa) { struct nvm_rq rqd; int ret = 0; - DECLARE_COMPLETION_ONSTACK(wait); memset(&rqd, 0, sizeof(struct nvm_rq)); pblk_setup_e_rq(pblk, &rqd, ppa); - rqd.end_io = pblk_end_io_sync; - rqd.private = &wait; - /* The write thread schedules erases so that it minimizes disturbances * with writes. Thus, there is no need to take the LUN semaphore. */ - ret = pblk_submit_io(pblk, &rqd); + ret = pblk_submit_io_sync(pblk, &rqd); if (ret) { struct nvm_tgt_dev *dev = pblk->dev; struct nvm_geo *geo = &dev->geo; @@ -857,11 +861,6 @@ static int pblk_blk_erase_sync(struct pblk *pblk, struct ppa_addr ppa) goto out; } - if (!wait_for_completion_io_timeout(&wait, - msecs_to_jiffies(PBLK_COMMAND_TIMEOUT_MS))) { - pr_err("pblk: sync erase timed out\n"); - } - out: rqd.private = pblk; __pblk_end_io_erase(pblk, &rqd); @@ -976,7 +975,7 @@ static int pblk_line_init_metadata(struct pblk *pblk, struct pblk_line *line, memcpy(smeta_buf->header.uuid, pblk->instance_uuid, 16); smeta_buf->header.id = cpu_to_le32(line->id); smeta_buf->header.type = cpu_to_le16(line->type); - smeta_buf->header.version = cpu_to_le16(1); + smeta_buf->header.version = SMETA_VERSION; /* Start metadata */ smeta_buf->seq_nr = cpu_to_le64(line->seq_nr); @@ -1046,7 +1045,7 @@ static int pblk_line_init_bb(struct pblk *pblk, struct pblk_line *line, line->smeta_ssec = off; line->cur_sec = off + lm->smeta_sec; - if (init && pblk_line_submit_smeta_io(pblk, line, off, WRITE)) { + if (init && pblk_line_submit_smeta_io(pblk, line, off, PBLK_WRITE)) { pr_debug("pblk: line smeta I/O failed. Retry\n"); return 1; } @@ -1056,7 +1055,6 @@ static int pblk_line_init_bb(struct pblk *pblk, struct pblk_line *line, /* Mark emeta metadata sectors as bad sectors. We need to consider bad * blocks to make sure that there are enough sectors to store emeta */ - bit = lm->sec_per_line; off = lm->sec_per_line - lm->emeta_sec[0]; bitmap_set(line->invalid_bitmap, off, lm->emeta_sec[0]); while (nr_bb) { @@ -1093,25 +1091,21 @@ static int pblk_line_prepare(struct pblk *pblk, struct pblk_line *line) struct pblk_line_meta *lm = &pblk->lm; int blk_in_line = atomic_read(&line->blk_in_line); - line->map_bitmap = mempool_alloc(pblk->line_meta_pool, GFP_ATOMIC); + line->map_bitmap = kzalloc(lm->sec_bitmap_len, GFP_ATOMIC); if (!line->map_bitmap) return -ENOMEM; - memset(line->map_bitmap, 0, lm->sec_bitmap_len); - /* invalid_bitmap is special since it is used when line is closed. No - * need to zeroized; it will be initialized using bb info form - * map_bitmap - */ - line->invalid_bitmap = mempool_alloc(pblk->line_meta_pool, GFP_ATOMIC); + /* will be initialized using bb info from map_bitmap */ + line->invalid_bitmap = kmalloc(lm->sec_bitmap_len, GFP_ATOMIC); if (!line->invalid_bitmap) { - mempool_free(line->map_bitmap, pblk->line_meta_pool); + kfree(line->map_bitmap); return -ENOMEM; } spin_lock(&line->lock); if (line->state != PBLK_LINESTATE_FREE) { - mempool_free(line->invalid_bitmap, pblk->line_meta_pool); - mempool_free(line->map_bitmap, pblk->line_meta_pool); + kfree(line->map_bitmap); + kfree(line->invalid_bitmap); spin_unlock(&line->lock); WARN(1, "pblk: corrupted line %d, state %d\n", line->id, line->state); @@ -1163,7 +1157,7 @@ int pblk_line_recov_alloc(struct pblk *pblk, struct pblk_line *line) void pblk_line_recov_close(struct pblk *pblk, struct pblk_line *line) { - mempool_free(line->map_bitmap, pblk->line_meta_pool); + kfree(line->map_bitmap); line->map_bitmap = NULL; line->smeta = NULL; line->emeta = NULL; @@ -1328,6 +1322,41 @@ static void pblk_stop_writes(struct pblk *pblk, struct pblk_line *line) pblk->state = PBLK_STATE_STOPPING; } +static void pblk_line_close_meta_sync(struct pblk *pblk) +{ + struct pblk_line_mgmt *l_mg = &pblk->l_mg; + struct pblk_line_meta *lm = &pblk->lm; + struct pblk_line *line, *tline; + LIST_HEAD(list); + + spin_lock(&l_mg->close_lock); + if (list_empty(&l_mg->emeta_list)) { + spin_unlock(&l_mg->close_lock); + return; + } + + list_cut_position(&list, &l_mg->emeta_list, l_mg->emeta_list.prev); + spin_unlock(&l_mg->close_lock); + + list_for_each_entry_safe(line, tline, &list, list) { + struct pblk_emeta *emeta = line->emeta; + + while (emeta->mem < lm->emeta_len[0]) { + int ret; + + ret = pblk_submit_meta_io(pblk, line); + if (ret) { + pr_err("pblk: sync meta line %d failed (%d)\n", + line->id, ret); + return; + } + } + } + + pblk_wait_for_meta(pblk); + flush_workqueue(pblk->close_wq); +} + void pblk_pipeline_stop(struct pblk *pblk) { struct pblk_line_mgmt *l_mg = &pblk->l_mg; @@ -1361,17 +1390,17 @@ void pblk_pipeline_stop(struct pblk *pblk) spin_unlock(&l_mg->free_lock); } -void pblk_line_replace_data(struct pblk *pblk) +struct pblk_line *pblk_line_replace_data(struct pblk *pblk) { struct pblk_line_mgmt *l_mg = &pblk->l_mg; - struct pblk_line *cur, *new; + struct pblk_line *cur, *new = NULL; unsigned int left_seblks; int is_next = 0; cur = l_mg->data_line; new = l_mg->data_next; if (!new) - return; + goto out; l_mg->data_line = new; spin_lock(&l_mg->free_lock); @@ -1379,7 +1408,7 @@ void pblk_line_replace_data(struct pblk *pblk) l_mg->data_line = NULL; l_mg->data_next = NULL; spin_unlock(&l_mg->free_lock); - return; + goto out; } pblk_line_setup_metadata(new, l_mg, &pblk->lm); @@ -1391,7 +1420,7 @@ retry_erase: /* If line is not fully erased, erase it */ if (atomic_read(&new->left_eblks)) { if (pblk_line_erase(pblk, new)) - return; + goto out; } else { io_schedule(); } @@ -1402,7 +1431,7 @@ retry_setup: if (!pblk_line_init_metadata(pblk, new, cur)) { new = pblk_line_retry(pblk, new); if (!new) - return; + goto out; goto retry_setup; } @@ -1410,7 +1439,7 @@ retry_setup: if (!pblk_line_init_bb(pblk, new, 1)) { new = pblk_line_retry(pblk, new); if (!new) - return; + goto out; goto retry_setup; } @@ -1434,14 +1463,15 @@ retry_setup: if (is_next) pblk_rl_free_lines_dec(&pblk->rl, l_mg->data_next); + +out: + return new; } void pblk_line_free(struct pblk *pblk, struct pblk_line *line) { - if (line->map_bitmap) - mempool_free(line->map_bitmap, pblk->line_meta_pool); - if (line->invalid_bitmap) - mempool_free(line->invalid_bitmap, pblk->line_meta_pool); + kfree(line->map_bitmap); + kfree(line->invalid_bitmap); *line->vsc = cpu_to_le32(EMPTY_ENTRY); @@ -1451,11 +1481,10 @@ void pblk_line_free(struct pblk *pblk, struct pblk_line *line) line->emeta = NULL; } -void pblk_line_put(struct kref *ref) +static void __pblk_line_put(struct pblk *pblk, struct pblk_line *line) { - struct pblk_line *line = container_of(ref, struct pblk_line, ref); - struct pblk *pblk = line->pblk; struct pblk_line_mgmt *l_mg = &pblk->l_mg; + struct pblk_gc *gc = &pblk->gc; spin_lock(&line->lock); WARN_ON(line->state != PBLK_LINESTATE_GC); @@ -1464,6 +1493,8 @@ void pblk_line_put(struct kref *ref) pblk_line_free(pblk, line); spin_unlock(&line->lock); + atomic_dec(&gc->pipeline_gc); + spin_lock(&l_mg->free_lock); list_add_tail(&line->list, &l_mg->free_list); l_mg->nr_free_lines++; @@ -1472,13 +1503,49 @@ void pblk_line_put(struct kref *ref) pblk_rl_free_lines_inc(&pblk->rl, line); } +static void pblk_line_put_ws(struct work_struct *work) +{ + struct pblk_line_ws *line_put_ws = container_of(work, + struct pblk_line_ws, ws); + struct pblk *pblk = line_put_ws->pblk; + struct pblk_line *line = line_put_ws->line; + + __pblk_line_put(pblk, line); + mempool_free(line_put_ws, pblk->gen_ws_pool); +} + +void pblk_line_put(struct kref *ref) +{ + struct pblk_line *line = container_of(ref, struct pblk_line, ref); + struct pblk *pblk = line->pblk; + + __pblk_line_put(pblk, line); +} + +void pblk_line_put_wq(struct kref *ref) +{ + struct pblk_line *line = container_of(ref, struct pblk_line, ref); + struct pblk *pblk = line->pblk; + struct pblk_line_ws *line_put_ws; + + line_put_ws = mempool_alloc(pblk->gen_ws_pool, GFP_ATOMIC); + if (!line_put_ws) + return; + + line_put_ws->pblk = pblk; + line_put_ws->line = line; + line_put_ws->priv = NULL; + + INIT_WORK(&line_put_ws->ws, pblk_line_put_ws); + queue_work(pblk->r_end_wq, &line_put_ws->ws); +} + int pblk_blk_erase_async(struct pblk *pblk, struct ppa_addr ppa) { struct nvm_rq *rqd; int err; - rqd = mempool_alloc(pblk->g_rq_pool, GFP_KERNEL); - memset(rqd, 0, pblk_g_rq_size); + rqd = pblk_alloc_rqd(pblk, PBLK_ERASE); pblk_setup_e_rq(pblk, rqd, ppa); @@ -1517,41 +1584,6 @@ int pblk_line_is_full(struct pblk_line *line) return (line->left_msecs == 0); } -void pblk_line_close_meta_sync(struct pblk *pblk) -{ - struct pblk_line_mgmt *l_mg = &pblk->l_mg; - struct pblk_line_meta *lm = &pblk->lm; - struct pblk_line *line, *tline; - LIST_HEAD(list); - - spin_lock(&l_mg->close_lock); - if (list_empty(&l_mg->emeta_list)) { - spin_unlock(&l_mg->close_lock); - return; - } - - list_cut_position(&list, &l_mg->emeta_list, l_mg->emeta_list.prev); - spin_unlock(&l_mg->close_lock); - - list_for_each_entry_safe(line, tline, &list, list) { - struct pblk_emeta *emeta = line->emeta; - - while (emeta->mem < lm->emeta_len[0]) { - int ret; - - ret = pblk_submit_meta_io(pblk, line); - if (ret) { - pr_err("pblk: sync meta line %d failed (%d)\n", - line->id, ret); - return; - } - } - } - - pblk_wait_for_meta(pblk); - flush_workqueue(pblk->close_wq); -} - static void pblk_line_should_sync_meta(struct pblk *pblk) { if (pblk_rl_is_limit(&pblk->rl)) @@ -1582,15 +1614,13 @@ void pblk_line_close(struct pblk *pblk, struct pblk_line *line) list_add_tail(&line->list, move_list); - mempool_free(line->map_bitmap, pblk->line_meta_pool); + kfree(line->map_bitmap); line->map_bitmap = NULL; line->smeta = NULL; line->emeta = NULL; spin_unlock(&line->lock); spin_unlock(&l_mg->gc_lock); - - pblk_gc_should_kick(pblk); } void pblk_line_close_meta(struct pblk *pblk, struct pblk_line *line) @@ -1624,43 +1654,16 @@ void pblk_line_close_ws(struct work_struct *work) struct pblk_line *line = line_ws->line; pblk_line_close(pblk, line); - mempool_free(line_ws, pblk->line_ws_pool); -} - -void pblk_line_mark_bb(struct work_struct *work) -{ - struct pblk_line_ws *line_ws = container_of(work, struct pblk_line_ws, - ws); - struct pblk *pblk = line_ws->pblk; - struct nvm_tgt_dev *dev = pblk->dev; - struct ppa_addr *ppa = line_ws->priv; - int ret; - - ret = nvm_set_tgt_bb_tbl(dev, ppa, 1, NVM_BLK_T_GRWN_BAD); - if (ret) { - struct pblk_line *line; - int pos; - - line = &pblk->lines[pblk_dev_ppa_to_line(*ppa)]; - pos = pblk_dev_ppa_to_pos(&dev->geo, *ppa); - - pr_err("pblk: failed to mark bb, line:%d, pos:%d\n", - line->id, pos); - } - - kfree(ppa); - mempool_free(line_ws, pblk->line_ws_pool); + mempool_free(line_ws, pblk->gen_ws_pool); } -void pblk_line_run_ws(struct pblk *pblk, struct pblk_line *line, void *priv, - void (*work)(struct work_struct *), +void pblk_gen_run_ws(struct pblk *pblk, struct pblk_line *line, void *priv, + void (*work)(struct work_struct *), gfp_t gfp_mask, struct workqueue_struct *wq) { struct pblk_line_ws *line_ws; - line_ws = mempool_alloc(pblk->line_ws_pool, GFP_ATOMIC); - if (!line_ws) - return; + line_ws = mempool_alloc(pblk->gen_ws_pool, gfp_mask); line_ws->pblk = pblk; line_ws->line = line; @@ -1689,16 +1692,8 @@ static void __pblk_down_page(struct pblk *pblk, struct ppa_addr *ppa_list, #endif ret = down_timeout(&rlun->wr_sem, msecs_to_jiffies(30000)); - if (ret) { - switch (ret) { - case -ETIME: - pr_err("pblk: lun semaphore timed out\n"); - break; - case -EINTR: - pr_err("pblk: lun semaphore timed out\n"); - break; - } - } + if (ret == -ETIME || ret == -EINTR) + pr_err("pblk: taking lun semaphore timed out: err %d\n", -ret); } void pblk_down_page(struct pblk *pblk, struct ppa_addr *ppa_list, int nr_ppas) @@ -1758,13 +1753,11 @@ void pblk_up_rq(struct pblk *pblk, struct ppa_addr *ppa_list, int nr_ppas, rlun = &pblk->luns[bit]; up(&rlun->wr_sem); } - - kfree(lun_bitmap); } void pblk_update_map(struct pblk *pblk, sector_t lba, struct ppa_addr ppa) { - struct ppa_addr l2p_ppa; + struct ppa_addr ppa_l2p; /* logic error: lba out-of-bounds. Ignore update */ if (!(lba < pblk->rl.nr_secs)) { @@ -1773,10 +1766,10 @@ void pblk_update_map(struct pblk *pblk, sector_t lba, struct ppa_addr ppa) } spin_lock(&pblk->trans_lock); - l2p_ppa = pblk_trans_map_get(pblk, lba); + ppa_l2p = pblk_trans_map_get(pblk, lba); - if (!pblk_addr_in_cache(l2p_ppa) && !pblk_ppa_empty(l2p_ppa)) - pblk_map_invalidate(pblk, l2p_ppa); + if (!pblk_addr_in_cache(ppa_l2p) && !pblk_ppa_empty(ppa_l2p)) + pblk_map_invalidate(pblk, ppa_l2p); pblk_trans_map_set(pblk, lba, ppa); spin_unlock(&pblk->trans_lock); @@ -1784,6 +1777,7 @@ void pblk_update_map(struct pblk *pblk, sector_t lba, struct ppa_addr ppa) void pblk_update_map_cache(struct pblk *pblk, sector_t lba, struct ppa_addr ppa) { + #ifdef CONFIG_NVM_DEBUG /* Callers must ensure that the ppa points to a cache address */ BUG_ON(!pblk_addr_in_cache(ppa)); @@ -1793,16 +1787,16 @@ void pblk_update_map_cache(struct pblk *pblk, sector_t lba, struct ppa_addr ppa) pblk_update_map(pblk, lba, ppa); } -int pblk_update_map_gc(struct pblk *pblk, sector_t lba, struct ppa_addr ppa, - struct pblk_line *gc_line) +int pblk_update_map_gc(struct pblk *pblk, sector_t lba, struct ppa_addr ppa_new, + struct pblk_line *gc_line, u64 paddr_gc) { - struct ppa_addr l2p_ppa; + struct ppa_addr ppa_l2p, ppa_gc; int ret = 1; #ifdef CONFIG_NVM_DEBUG /* Callers must ensure that the ppa points to a cache address */ - BUG_ON(!pblk_addr_in_cache(ppa)); - BUG_ON(pblk_rb_pos_oob(&pblk->rwb, pblk_addr_to_cacheline(ppa))); + BUG_ON(!pblk_addr_in_cache(ppa_new)); + BUG_ON(pblk_rb_pos_oob(&pblk->rwb, pblk_addr_to_cacheline(ppa_new))); #endif /* logic error: lba out-of-bounds. Ignore update */ @@ -1812,36 +1806,41 @@ int pblk_update_map_gc(struct pblk *pblk, sector_t lba, struct ppa_addr ppa, } spin_lock(&pblk->trans_lock); - l2p_ppa = pblk_trans_map_get(pblk, lba); + ppa_l2p = pblk_trans_map_get(pblk, lba); + ppa_gc = addr_to_gen_ppa(pblk, paddr_gc, gc_line->id); + + if (!pblk_ppa_comp(ppa_l2p, ppa_gc)) { + spin_lock(&gc_line->lock); + WARN(!test_bit(paddr_gc, gc_line->invalid_bitmap), + "pblk: corrupted GC update"); + spin_unlock(&gc_line->lock); - /* Prevent updated entries to be overwritten by GC */ - if (pblk_addr_in_cache(l2p_ppa) || pblk_ppa_empty(l2p_ppa) || - pblk_tgt_ppa_to_line(l2p_ppa) != gc_line->id) { ret = 0; goto out; } - pblk_trans_map_set(pblk, lba, ppa); + pblk_trans_map_set(pblk, lba, ppa_new); out: spin_unlock(&pblk->trans_lock); return ret; } -void pblk_update_map_dev(struct pblk *pblk, sector_t lba, struct ppa_addr ppa, - struct ppa_addr entry_line) +void pblk_update_map_dev(struct pblk *pblk, sector_t lba, + struct ppa_addr ppa_mapped, struct ppa_addr ppa_cache) { - struct ppa_addr l2p_line; + struct ppa_addr ppa_l2p; #ifdef CONFIG_NVM_DEBUG /* Callers must ensure that the ppa points to a device address */ - BUG_ON(pblk_addr_in_cache(ppa)); + BUG_ON(pblk_addr_in_cache(ppa_mapped)); #endif /* Invalidate and discard padded entries */ if (lba == ADDR_EMPTY) { #ifdef CONFIG_NVM_DEBUG atomic_long_inc(&pblk->padded_wb); #endif - pblk_map_invalidate(pblk, ppa); + if (!pblk_ppa_empty(ppa_mapped)) + pblk_map_invalidate(pblk, ppa_mapped); return; } @@ -1852,22 +1851,22 @@ void pblk_update_map_dev(struct pblk *pblk, sector_t lba, struct ppa_addr ppa, } spin_lock(&pblk->trans_lock); - l2p_line = pblk_trans_map_get(pblk, lba); + ppa_l2p = pblk_trans_map_get(pblk, lba); /* Do not update L2P if the cacheline has been updated. In this case, * the mapped ppa must be invalidated */ - if (l2p_line.ppa != entry_line.ppa) { - if (!pblk_ppa_empty(ppa)) - pblk_map_invalidate(pblk, ppa); + if (!pblk_ppa_comp(ppa_l2p, ppa_cache)) { + if (!pblk_ppa_empty(ppa_mapped)) + pblk_map_invalidate(pblk, ppa_mapped); goto out; } #ifdef CONFIG_NVM_DEBUG - WARN_ON(!pblk_addr_in_cache(l2p_line) && !pblk_ppa_empty(l2p_line)); + WARN_ON(!pblk_addr_in_cache(ppa_l2p) && !pblk_ppa_empty(ppa_l2p)); #endif - pblk_trans_map_set(pblk, lba, ppa); + pblk_trans_map_set(pblk, lba, ppa_mapped); out: spin_unlock(&pblk->trans_lock); } @@ -1878,23 +1877,32 @@ void pblk_lookup_l2p_seq(struct pblk *pblk, struct ppa_addr *ppas, int i; spin_lock(&pblk->trans_lock); - for (i = 0; i < nr_secs; i++) - ppas[i] = pblk_trans_map_get(pblk, blba + i); + for (i = 0; i < nr_secs; i++) { + struct ppa_addr ppa; + + ppa = ppas[i] = pblk_trans_map_get(pblk, blba + i); + + /* If the L2P entry maps to a line, the reference is valid */ + if (!pblk_ppa_empty(ppa) && !pblk_addr_in_cache(ppa)) { + int line_id = pblk_dev_ppa_to_line(ppa); + struct pblk_line *line = &pblk->lines[line_id]; + + kref_get(&line->ref); + } + } spin_unlock(&pblk->trans_lock); } void pblk_lookup_l2p_rand(struct pblk *pblk, struct ppa_addr *ppas, u64 *lba_list, int nr_secs) { - sector_t lba; + u64 lba; int i; spin_lock(&pblk->trans_lock); for (i = 0; i < nr_secs; i++) { lba = lba_list[i]; - if (lba == ADDR_EMPTY) { - ppas[i].ppa = ADDR_EMPTY; - } else { + if (lba != ADDR_EMPTY) { /* logic error: lba out-of-bounds. Ignore update */ if (!(lba < pblk->rl.nr_secs)) { WARN(1, "pblk: corrupted L2P map request\n"); diff --git a/drivers/lightnvm/pblk-gc.c b/drivers/lightnvm/pblk-gc.c index 6090d28..00d5698 100644 --- a/drivers/lightnvm/pblk-gc.c +++ b/drivers/lightnvm/pblk-gc.c @@ -20,7 +20,8 @@ static void pblk_gc_free_gc_rq(struct pblk_gc_rq *gc_rq) { - vfree(gc_rq->data); + if (gc_rq->data) + vfree(gc_rq->data); kfree(gc_rq); } @@ -41,10 +42,7 @@ static int pblk_gc_write(struct pblk *pblk) spin_unlock(&gc->w_lock); list_for_each_entry_safe(gc_rq, tgc_rq, &w_list, list) { - pblk_write_gc_to_cache(pblk, gc_rq->data, gc_rq->lba_list, - gc_rq->nr_secs, gc_rq->secs_to_gc, - gc_rq->line, PBLK_IOTYPE_GC); - + pblk_write_gc_to_cache(pblk, gc_rq); list_del(&gc_rq->list); kref_put(&gc_rq->line->ref, pblk_line_put); pblk_gc_free_gc_rq(gc_rq); @@ -58,42 +56,59 @@ static void pblk_gc_writer_kick(struct pblk_gc *gc) wake_up_process(gc->gc_writer_ts); } -/* - * Responsible for managing all memory related to a gc request. Also in case of - * failure - */ -static int pblk_gc_move_valid_secs(struct pblk *pblk, struct pblk_gc_rq *gc_rq) +static void pblk_put_line_back(struct pblk *pblk, struct pblk_line *line) +{ + struct pblk_line_mgmt *l_mg = &pblk->l_mg; + struct list_head *move_list; + + spin_lock(&line->lock); + WARN_ON(line->state != PBLK_LINESTATE_GC); + line->state = PBLK_LINESTATE_CLOSED; + move_list = pblk_line_gc_list(pblk, line); + spin_unlock(&line->lock); + + if (move_list) { + spin_lock(&l_mg->gc_lock); + list_add_tail(&line->list, move_list); + spin_unlock(&l_mg->gc_lock); + } +} + +static void pblk_gc_line_ws(struct work_struct *work) { + struct pblk_line_ws *gc_rq_ws = container_of(work, + struct pblk_line_ws, ws); + struct pblk *pblk = gc_rq_ws->pblk; struct nvm_tgt_dev *dev = pblk->dev; struct nvm_geo *geo = &dev->geo; struct pblk_gc *gc = &pblk->gc; - struct pblk_line *line = gc_rq->line; - void *data; - unsigned int secs_to_gc; - int ret = 0; + struct pblk_line *line = gc_rq_ws->line; + struct pblk_gc_rq *gc_rq = gc_rq_ws->priv; + int ret; - data = vmalloc(gc_rq->nr_secs * geo->sec_size); - if (!data) { - ret = -ENOMEM; + up(&gc->gc_sem); + + gc_rq->data = vmalloc(gc_rq->nr_secs * geo->sec_size); + if (!gc_rq->data) { + pr_err("pblk: could not GC line:%d (%d/%d)\n", + line->id, *line->vsc, gc_rq->nr_secs); goto out; } /* Read from GC victim block */ - if (pblk_submit_read_gc(pblk, gc_rq->lba_list, data, gc_rq->nr_secs, - &secs_to_gc, line)) { - ret = -EFAULT; - goto free_data; + ret = pblk_submit_read_gc(pblk, gc_rq); + if (ret) { + pr_err("pblk: failed GC read in line:%d (err:%d)\n", + line->id, ret); + goto out; } - if (!secs_to_gc) - goto free_rq; - - gc_rq->data = data; - gc_rq->secs_to_gc = secs_to_gc; + if (!gc_rq->secs_to_gc) + goto out; retry: spin_lock(&gc->w_lock); - if (gc->w_entries >= PBLK_GC_W_QD) { + if (gc->w_entries >= PBLK_GC_RQ_QD) { spin_unlock(&gc->w_lock); pblk_gc_writer_kick(&pblk->gc); usleep_range(128, 256); @@ -105,53 +120,13 @@ retry: pblk_gc_writer_kick(&pblk->gc); - return 0; + kfree(gc_rq_ws); + return; -free_rq: - kfree(gc_rq); -free_data: - vfree(data); out: + pblk_gc_free_gc_rq(gc_rq); kref_put(&line->ref, pblk_line_put); - return ret; -} - -static void pblk_put_line_back(struct pblk *pblk, struct pblk_line *line) -{ - struct pblk_line_mgmt *l_mg = &pblk->l_mg; - struct list_head *move_list; - - spin_lock(&line->lock); - WARN_ON(line->state != PBLK_LINESTATE_GC); - line->state = PBLK_LINESTATE_CLOSED; - move_list = pblk_line_gc_list(pblk, line); - spin_unlock(&line->lock); - - if (move_list) { - spin_lock(&l_mg->gc_lock); - list_add_tail(&line->list, move_list); - spin_unlock(&l_mg->gc_lock); - } -} - -static void pblk_gc_line_ws(struct work_struct *work) -{ - struct pblk_line_ws *line_rq_ws = container_of(work, - struct pblk_line_ws, ws); - struct pblk *pblk = line_rq_ws->pblk; - struct pblk_gc *gc = &pblk->gc; - struct pblk_line *line = line_rq_ws->line; - struct pblk_gc_rq *gc_rq = line_rq_ws->priv; - - up(&gc->gc_sem); - - if (pblk_gc_move_valid_secs(pblk, gc_rq)) { - pr_err("pblk: could not GC all sectors: line:%d (%d/%d)\n", - line->id, *line->vsc, - gc_rq->nr_secs); - } - - mempool_free(line_rq_ws, pblk->line_ws_pool); + kfree(gc_rq_ws); } static void pblk_gc_line_prepare_ws(struct work_struct *work) @@ -164,17 +139,24 @@ static void pblk_gc_line_prepare_ws(struct work_struct *work) struct pblk_line_meta *lm = &pblk->lm; struct pblk_gc *gc = &pblk->gc; struct line_emeta *emeta_buf; - struct pblk_line_ws *line_rq_ws; + struct pblk_line_ws *gc_rq_ws; struct pblk_gc_rq *gc_rq; __le64 *lba_list; + unsigned long *invalid_bitmap; int sec_left, nr_secs, bit; int ret; + invalid_bitmap = kmalloc(lm->sec_bitmap_len, GFP_KERNEL); + if (!invalid_bitmap) { + pr_err("pblk: could not allocate GC invalid bitmap\n"); + goto fail_free_ws; + } + emeta_buf = pblk_malloc(lm->emeta_len[0], l_mg->emeta_alloc_type, GFP_KERNEL); if (!emeta_buf) { pr_err("pblk: cannot use GC emeta\n"); - return; + goto fail_free_bitmap; } ret = pblk_line_read_emeta(pblk, line, emeta_buf); @@ -193,7 +175,11 @@ static void pblk_gc_line_prepare_ws(struct work_struct *work) goto fail_free_emeta; } + spin_lock(&line->lock); + bitmap_copy(invalid_bitmap, line->invalid_bitmap, lm->sec_per_line); sec_left = pblk_line_vsc(line); + spin_unlock(&line->lock); + if (sec_left < 0) { pr_err("pblk: corrupted GC line (%d)\n", line->id); goto fail_free_emeta; @@ -207,11 +193,12 @@ next_rq: nr_secs = 0; do { - bit = find_next_zero_bit(line->invalid_bitmap, lm->sec_per_line, + bit = find_next_zero_bit(invalid_bitmap, lm->sec_per_line, bit + 1); if (bit > line->emeta_ssec) break; + gc_rq->paddr_list[nr_secs] = bit; gc_rq->lba_list[nr_secs++] = le64_to_cpu(lba_list[bit]); } while (nr_secs < pblk->max_write_pgs); @@ -223,19 +210,25 @@ next_rq: gc_rq->nr_secs = nr_secs; gc_rq->line = line; - line_rq_ws = mempool_alloc(pblk->line_ws_pool, GFP_KERNEL); - if (!line_rq_ws) + gc_rq_ws = kmalloc(sizeof(struct pblk_line_ws), GFP_KERNEL); + if (!gc_rq_ws) goto fail_free_gc_rq; - line_rq_ws->pblk = pblk; - line_rq_ws->line = line; - line_rq_ws->priv = gc_rq; + gc_rq_ws->pblk = pblk; + gc_rq_ws->line = line; + gc_rq_ws->priv = gc_rq; + + /* The write GC path can be much slower than the read GC one due to + * the budget imposed by the rate-limiter. Balance in case that we get + * back pressure from the write GC path. + */ + while (down_timeout(&gc->gc_sem, msecs_to_jiffies(30000))) + io_schedule(); - down(&gc->gc_sem); kref_get(&line->ref); - INIT_WORK(&line_rq_ws->ws, pblk_gc_line_ws); - queue_work(gc->gc_line_reader_wq, &line_rq_ws->ws); + INIT_WORK(&gc_rq_ws->ws, pblk_gc_line_ws); + queue_work(gc->gc_line_reader_wq, &gc_rq_ws->ws); sec_left -= nr_secs; if (sec_left > 0) @@ -243,10 +236,11 @@ next_rq: out: pblk_mfree(emeta_buf, l_mg->emeta_alloc_type); - mempool_free(line_ws, pblk->line_ws_pool); + kfree(line_ws); + kfree(invalid_bitmap); kref_put(&line->ref, pblk_line_put); - atomic_dec(&gc->inflight_gc); + atomic_dec(&gc->read_inflight_gc); return; @@ -254,10 +248,14 @@ fail_free_gc_rq: kfree(gc_rq); fail_free_emeta: pblk_mfree(emeta_buf, l_mg->emeta_alloc_type); +fail_free_bitmap: + kfree(invalid_bitmap); +fail_free_ws: + kfree(line_ws); + pblk_put_line_back(pblk, line); kref_put(&line->ref, pblk_line_put); - mempool_free(line_ws, pblk->line_ws_pool); - atomic_dec(&gc->inflight_gc); + atomic_dec(&gc->read_inflight_gc); pr_err("pblk: Failed to GC line %d\n", line->id); } @@ -269,19 +267,40 @@ static int pblk_gc_line(struct pblk *pblk, struct pblk_line *line) pr_debug("pblk: line '%d' being reclaimed for GC\n", line->id); - line_ws = mempool_alloc(pblk->line_ws_pool, GFP_KERNEL); + line_ws = kmalloc(sizeof(struct pblk_line_ws), GFP_KERNEL); if (!line_ws) return -ENOMEM; line_ws->pblk = pblk; line_ws->line = line; + atomic_inc(&gc->pipeline_gc); INIT_WORK(&line_ws->ws, pblk_gc_line_prepare_ws); queue_work(gc->gc_reader_wq, &line_ws->ws); return 0; } +static void pblk_gc_reader_kick(struct pblk_gc *gc) +{ + wake_up_process(gc->gc_reader_ts); +} + +static void pblk_gc_kick(struct pblk *pblk) +{ + struct pblk_gc *gc = &pblk->gc; + + pblk_gc_writer_kick(gc); + pblk_gc_reader_kick(gc); + + /* If we're shutting down GC, let's not start it up again */ + if (gc->gc_enabled) { + wake_up_process(gc->gc_ts); + mod_timer(&gc->gc_timer, + jiffies + msecs_to_jiffies(GC_TIME_MSECS)); + } +} + static int pblk_gc_read(struct pblk *pblk) { struct pblk_gc *gc = &pblk->gc; @@ -305,11 +324,6 @@ static int pblk_gc_read(struct pblk *pblk) return 0; } -static void pblk_gc_reader_kick(struct pblk_gc *gc) -{ - wake_up_process(gc->gc_reader_ts); -} - static struct pblk_line *pblk_gc_get_victim_line(struct pblk *pblk, struct list_head *group_list) { @@ -338,26 +352,17 @@ static bool pblk_gc_should_run(struct pblk_gc *gc, struct pblk_rl *rl) return ((gc->gc_active) && (nr_blocks_need > nr_blocks_free)); } -/* - * Lines with no valid sectors will be returned to the free list immediately. If - * GC is activated - either because the free block count is under the determined - * threshold, or because it is being forced from user space - only lines with a - * high count of invalid sectors will be recycled. - */ -static void pblk_gc_run(struct pblk *pblk) +void pblk_gc_free_full_lines(struct pblk *pblk) { struct pblk_line_mgmt *l_mg = &pblk->l_mg; struct pblk_gc *gc = &pblk->gc; struct pblk_line *line; - struct list_head *group_list; - bool run_gc; - int inflight_gc, gc_group = 0, prev_group = 0; do { spin_lock(&l_mg->gc_lock); if (list_empty(&l_mg->gc_full_list)) { spin_unlock(&l_mg->gc_lock); - break; + return; } line = list_first_entry(&l_mg->gc_full_list, @@ -371,11 +376,30 @@ static void pblk_gc_run(struct pblk *pblk) list_del(&line->list); spin_unlock(&l_mg->gc_lock); + atomic_inc(&gc->pipeline_gc); kref_put(&line->ref, pblk_line_put); } while (1); +} + +/* + * Lines with no valid sectors will be returned to the free list immediately. If + * GC is activated - either because the free block count is under the determined + * threshold, or because it is being forced from user space - only lines with a + * high count of invalid sectors will be recycled. + */ +static void pblk_gc_run(struct pblk *pblk) +{ + struct pblk_line_mgmt *l_mg = &pblk->l_mg; + struct pblk_gc *gc = &pblk->gc; + struct pblk_line *line; + struct list_head *group_list; + bool run_gc; + int read_inflight_gc, gc_group = 0, prev_group = 0; + + pblk_gc_free_full_lines(pblk); run_gc = pblk_gc_should_run(&pblk->gc, &pblk->rl); - if (!run_gc || (atomic_read(&gc->inflight_gc) >= PBLK_GC_L_QD)) + if (!run_gc || (atomic_read(&gc->read_inflight_gc) >= PBLK_GC_L_QD)) return; next_gc_group: @@ -402,14 +426,14 @@ next_gc_group: list_add_tail(&line->list, &gc->r_list); spin_unlock(&gc->r_lock); - inflight_gc = atomic_inc_return(&gc->inflight_gc); + read_inflight_gc = atomic_inc_return(&gc->read_inflight_gc); pblk_gc_reader_kick(gc); prev_group = 1; /* No need to queue up more GC lines than we can handle */ run_gc = pblk_gc_should_run(&pblk->gc, &pblk->rl); - if (!run_gc || inflight_gc >= PBLK_GC_L_QD) + if (!run_gc || read_inflight_gc >= PBLK_GC_L_QD) break; } while (1); @@ -418,16 +442,6 @@ next_gc_group: goto next_gc_group; } -void pblk_gc_kick(struct pblk *pblk) -{ - struct pblk_gc *gc = &pblk->gc; - - wake_up_process(gc->gc_ts); - pblk_gc_writer_kick(gc); - pblk_gc_reader_kick(gc); - mod_timer(&gc->gc_timer, jiffies + msecs_to_jiffies(GC_TIME_MSECS)); -} - static void pblk_gc_timer(unsigned long data) { struct pblk *pblk = (struct pblk *)data; @@ -465,6 +479,7 @@ static int pblk_gc_writer_ts(void *data) static int pblk_gc_reader_ts(void *data) { struct pblk *pblk = data; + struct pblk_gc *gc = &pblk->gc; while (!kthread_should_stop()) { if (!pblk_gc_read(pblk)) @@ -473,6 +488,18 @@ static int pblk_gc_reader_ts(void *data) io_schedule(); } +#ifdef CONFIG_NVM_DEBUG + pr_info("pblk: flushing gc pipeline, %d lines left\n", + atomic_read(&gc->pipeline_gc)); +#endif + + do { + if (!atomic_read(&gc->pipeline_gc)) + break; + + schedule(); + } while (1); + return 0; } @@ -486,10 +513,10 @@ void pblk_gc_should_start(struct pblk *pblk) { struct pblk_gc *gc = &pblk->gc; - if (gc->gc_enabled && !gc->gc_active) + if (gc->gc_enabled && !gc->gc_active) { pblk_gc_start(pblk); - - pblk_gc_kick(pblk); + pblk_gc_kick(pblk); + } } /* @@ -510,6 +537,11 @@ void pblk_gc_should_stop(struct pblk *pblk) pblk_gc_stop(pblk, 0); } +void pblk_gc_should_kick(struct pblk *pblk) +{ + pblk_rl_update_rates(&pblk->rl); +} + void pblk_gc_sysfs_state_show(struct pblk *pblk, int *gc_enabled, int *gc_active) { @@ -576,7 +608,8 @@ int pblk_gc_init(struct pblk *pblk) gc->gc_forced = 0; gc->gc_enabled = 1; gc->w_entries = 0; - atomic_set(&gc->inflight_gc, 0); + atomic_set(&gc->read_inflight_gc, 0); + atomic_set(&gc->pipeline_gc, 0); /* Workqueue that reads valid sectors from a line and submit them to the * GC writer to be recycled. @@ -602,7 +635,7 @@ int pblk_gc_init(struct pblk *pblk) spin_lock_init(&gc->w_lock); spin_lock_init(&gc->r_lock); - sema_init(&gc->gc_sem, 128); + sema_init(&gc->gc_sem, PBLK_GC_RQ_QD); INIT_LIST_HEAD(&gc->w_list); INIT_LIST_HEAD(&gc->r_list); @@ -625,24 +658,24 @@ void pblk_gc_exit(struct pblk *pblk) { struct pblk_gc *gc = &pblk->gc; - flush_workqueue(gc->gc_reader_wq); - flush_workqueue(gc->gc_line_reader_wq); - - del_timer(&gc->gc_timer); + gc->gc_enabled = 0; + del_timer_sync(&gc->gc_timer); pblk_gc_stop(pblk, 1); if (gc->gc_ts) kthread_stop(gc->gc_ts); + if (gc->gc_reader_ts) + kthread_stop(gc->gc_reader_ts); + + flush_workqueue(gc->gc_reader_wq); if (gc->gc_reader_wq) destroy_workqueue(gc->gc_reader_wq); + flush_workqueue(gc->gc_line_reader_wq); if (gc->gc_line_reader_wq) destroy_workqueue(gc->gc_line_reader_wq); if (gc->gc_writer_ts) kthread_stop(gc->gc_writer_ts); - - if (gc->gc_reader_ts) - kthread_stop(gc->gc_reader_ts); } diff --git a/drivers/lightnvm/pblk-init.c b/drivers/lightnvm/pblk-init.c index 1b0f612..f62112b 100644 --- a/drivers/lightnvm/pblk-init.c +++ b/drivers/lightnvm/pblk-init.c @@ -20,8 +20,8 @@ #include "pblk.h" -static struct kmem_cache *pblk_blk_ws_cache, *pblk_rec_cache, *pblk_g_rq_cache, - *pblk_w_rq_cache, *pblk_line_meta_cache; +static struct kmem_cache *pblk_ws_cache, *pblk_rec_cache, *pblk_g_rq_cache, + *pblk_w_rq_cache; static DECLARE_RWSEM(pblk_lock); struct bio_set *pblk_bio_set; @@ -46,7 +46,7 @@ static int pblk_rw_io(struct request_queue *q, struct pblk *pblk, * user I/Os. Unless stalled, the rate limiter leaves at least 256KB * available for user I/O. */ - if (unlikely(pblk_get_secs(bio) >= pblk_rl_sysfs_rate_show(&pblk->rl))) + if (pblk_get_secs(bio) > pblk_rl_max_io(&pblk->rl)) blk_queue_split(q, &bio); return pblk_write_to_cache(pblk, bio, PBLK_IOTYPE_USER); @@ -76,6 +76,28 @@ static blk_qc_t pblk_make_rq(struct request_queue *q, struct bio *bio) return BLK_QC_T_NONE; } +static size_t pblk_trans_map_size(struct pblk *pblk) +{ + int entry_size = 8; + + if (pblk->ppaf_bitsize < 32) + entry_size = 4; + + return entry_size * pblk->rl.nr_secs; +} + +#ifdef CONFIG_NVM_DEBUG +static u32 pblk_l2p_crc(struct pblk *pblk) +{ + size_t map_size; + u32 crc = ~(u32)0; + + map_size = pblk_trans_map_size(pblk); + crc = crc32_le(crc, pblk->trans_map, map_size); + return crc; +} +#endif + static void pblk_l2p_free(struct pblk *pblk) { vfree(pblk->trans_map); @@ -85,12 +107,10 @@ static int pblk_l2p_init(struct pblk *pblk) { sector_t i; struct ppa_addr ppa; - int entry_size = 8; + size_t map_size; - if (pblk->ppaf_bitsize < 32) - entry_size = 4; - - pblk->trans_map = vmalloc(entry_size * pblk->rl.nr_secs); + map_size = pblk_trans_map_size(pblk); + pblk->trans_map = vmalloc(map_size); if (!pblk->trans_map) return -ENOMEM; @@ -132,7 +152,6 @@ static int pblk_rwb_init(struct pblk *pblk) } /* Minimum pages needed within a lun */ -#define PAGE_POOL_SIZE 16 #define ADDR_POOL_SIZE 64 static int pblk_set_ppaf(struct pblk *pblk) @@ -182,12 +201,10 @@ static int pblk_set_ppaf(struct pblk *pblk) static int pblk_init_global_caches(struct pblk *pblk) { - char cache_name[PBLK_CACHE_NAME_LEN]; - down_write(&pblk_lock); - pblk_blk_ws_cache = kmem_cache_create("pblk_blk_ws", + pblk_ws_cache = kmem_cache_create("pblk_blk_ws", sizeof(struct pblk_line_ws), 0, 0, NULL); - if (!pblk_blk_ws_cache) { + if (!pblk_ws_cache) { up_write(&pblk_lock); return -ENOMEM; } @@ -195,7 +212,7 @@ static int pblk_init_global_caches(struct pblk *pblk) pblk_rec_cache = kmem_cache_create("pblk_rec", sizeof(struct pblk_rec_ctx), 0, 0, NULL); if (!pblk_rec_cache) { - kmem_cache_destroy(pblk_blk_ws_cache); + kmem_cache_destroy(pblk_ws_cache); up_write(&pblk_lock); return -ENOMEM; } @@ -203,7 +220,7 @@ static int pblk_init_global_caches(struct pblk *pblk) pblk_g_rq_cache = kmem_cache_create("pblk_g_rq", pblk_g_rq_size, 0, 0, NULL); if (!pblk_g_rq_cache) { - kmem_cache_destroy(pblk_blk_ws_cache); + kmem_cache_destroy(pblk_ws_cache); kmem_cache_destroy(pblk_rec_cache); up_write(&pblk_lock); return -ENOMEM; @@ -212,30 +229,25 @@ static int pblk_init_global_caches(struct pblk *pblk) pblk_w_rq_cache = kmem_cache_create("pblk_w_rq", pblk_w_rq_size, 0, 0, NULL); if (!pblk_w_rq_cache) { - kmem_cache_destroy(pblk_blk_ws_cache); + kmem_cache_destroy(pblk_ws_cache); kmem_cache_destroy(pblk_rec_cache); kmem_cache_destroy(pblk_g_rq_cache); up_write(&pblk_lock); return -ENOMEM; } - - snprintf(cache_name, sizeof(cache_name), "pblk_line_m_%s", - pblk->disk->disk_name); - pblk_line_meta_cache = kmem_cache_create(cache_name, - pblk->lm.sec_bitmap_len, 0, 0, NULL); - if (!pblk_line_meta_cache) { - kmem_cache_destroy(pblk_blk_ws_cache); - kmem_cache_destroy(pblk_rec_cache); - kmem_cache_destroy(pblk_g_rq_cache); - kmem_cache_destroy(pblk_w_rq_cache); - up_write(&pblk_lock); - return -ENOMEM; - } up_write(&pblk_lock); return 0; } +static void pblk_free_global_caches(struct pblk *pblk) +{ + kmem_cache_destroy(pblk_ws_cache); + kmem_cache_destroy(pblk_rec_cache); + kmem_cache_destroy(pblk_g_rq_cache); + kmem_cache_destroy(pblk_w_rq_cache); +} + static int pblk_core_init(struct pblk *pblk) { struct nvm_tgt_dev *dev = pblk->dev; @@ -247,70 +259,80 @@ static int pblk_core_init(struct pblk *pblk) if (pblk_init_global_caches(pblk)) return -ENOMEM; - pblk->page_pool = mempool_create_page_pool(PAGE_POOL_SIZE, 0); - if (!pblk->page_pool) - return -ENOMEM; + /* Internal bios can be at most the sectors signaled by the device. */ + pblk->page_bio_pool = mempool_create_page_pool(nvm_max_phys_sects(dev), + 0); + if (!pblk->page_bio_pool) + goto free_global_caches; - pblk->line_ws_pool = mempool_create_slab_pool(PBLK_WS_POOL_SIZE, - pblk_blk_ws_cache); - if (!pblk->line_ws_pool) - goto free_page_pool; + pblk->gen_ws_pool = mempool_create_slab_pool(PBLK_GEN_WS_POOL_SIZE, + pblk_ws_cache); + if (!pblk->gen_ws_pool) + goto free_page_bio_pool; pblk->rec_pool = mempool_create_slab_pool(geo->nr_luns, pblk_rec_cache); if (!pblk->rec_pool) - goto free_blk_ws_pool; + goto free_gen_ws_pool; - pblk->g_rq_pool = mempool_create_slab_pool(PBLK_READ_REQ_POOL_SIZE, + pblk->r_rq_pool = mempool_create_slab_pool(geo->nr_luns, pblk_g_rq_cache); - if (!pblk->g_rq_pool) + if (!pblk->r_rq_pool) goto free_rec_pool; - pblk->w_rq_pool = mempool_create_slab_pool(geo->nr_luns * 2, + pblk->e_rq_pool = mempool_create_slab_pool(geo->nr_luns, + pblk_g_rq_cache); + if (!pblk->e_rq_pool) + goto free_r_rq_pool; + + pblk->w_rq_pool = mempool_create_slab_pool(geo->nr_luns, pblk_w_rq_cache); if (!pblk->w_rq_pool) - goto free_g_rq_pool; - - pblk->line_meta_pool = - mempool_create_slab_pool(PBLK_META_POOL_SIZE, - pblk_line_meta_cache); - if (!pblk->line_meta_pool) - goto free_w_rq_pool; + goto free_e_rq_pool; pblk->close_wq = alloc_workqueue("pblk-close-wq", WQ_MEM_RECLAIM | WQ_UNBOUND, PBLK_NR_CLOSE_JOBS); if (!pblk->close_wq) - goto free_line_meta_pool; + goto free_w_rq_pool; pblk->bb_wq = alloc_workqueue("pblk-bb-wq", WQ_MEM_RECLAIM | WQ_UNBOUND, 0); if (!pblk->bb_wq) goto free_close_wq; - if (pblk_set_ppaf(pblk)) + pblk->r_end_wq = alloc_workqueue("pblk-read-end-wq", + WQ_MEM_RECLAIM | WQ_UNBOUND, 0); + if (!pblk->r_end_wq) goto free_bb_wq; + if (pblk_set_ppaf(pblk)) + goto free_r_end_wq; + if (pblk_rwb_init(pblk)) - goto free_bb_wq; + goto free_r_end_wq; INIT_LIST_HEAD(&pblk->compl_list); return 0; +free_r_end_wq: + destroy_workqueue(pblk->r_end_wq); free_bb_wq: destroy_workqueue(pblk->bb_wq); free_close_wq: destroy_workqueue(pblk->close_wq); -free_line_meta_pool: - mempool_destroy(pblk->line_meta_pool); free_w_rq_pool: mempool_destroy(pblk->w_rq_pool); -free_g_rq_pool: - mempool_destroy(pblk->g_rq_pool); +free_e_rq_pool: + mempool_destroy(pblk->e_rq_pool); +free_r_rq_pool: + mempool_destroy(pblk->r_rq_pool); free_rec_pool: mempool_destroy(pblk->rec_pool); -free_blk_ws_pool: - mempool_destroy(pblk->line_ws_pool); -free_page_pool: - mempool_destroy(pblk->page_pool); +free_gen_ws_pool: + mempool_destroy(pblk->gen_ws_pool); +free_page_bio_pool: + mempool_destroy(pblk->page_bio_pool); +free_global_caches: + pblk_free_global_caches(pblk); return -ENOMEM; } @@ -319,21 +341,20 @@ static void pblk_core_free(struct pblk *pblk) if (pblk->close_wq) destroy_workqueue(pblk->close_wq); + if (pblk->r_end_wq) + destroy_workqueue(pblk->r_end_wq); + if (pblk->bb_wq) destroy_workqueue(pblk->bb_wq); - mempool_destroy(pblk->page_pool); - mempool_destroy(pblk->line_ws_pool); + mempool_destroy(pblk->page_bio_pool); + mempool_destroy(pblk->gen_ws_pool); mempool_destroy(pblk->rec_pool); - mempool_destroy(pblk->g_rq_pool); + mempool_destroy(pblk->r_rq_pool); + mempool_destroy(pblk->e_rq_pool); mempool_destroy(pblk->w_rq_pool); - mempool_destroy(pblk->line_meta_pool); - kmem_cache_destroy(pblk_blk_ws_cache); - kmem_cache_destroy(pblk_rec_cache); - kmem_cache_destroy(pblk_g_rq_cache); - kmem_cache_destroy(pblk_w_rq_cache); - kmem_cache_destroy(pblk_line_meta_cache); + pblk_free_global_caches(pblk); } static void pblk_luns_free(struct pblk *pblk) @@ -372,13 +393,11 @@ static void pblk_line_meta_free(struct pblk *pblk) kfree(l_mg->bb_aux); kfree(l_mg->vsc_list); - spin_lock(&l_mg->free_lock); for (i = 0; i < PBLK_DATA_LINES; i++) { kfree(l_mg->sline_meta[i]); pblk_mfree(l_mg->eline_meta[i]->buf, l_mg->emeta_alloc_type); kfree(l_mg->eline_meta[i]); } - spin_unlock(&l_mg->free_lock); kfree(pblk->lines); } @@ -507,6 +526,13 @@ static int pblk_lines_configure(struct pblk *pblk, int flags) } } +#ifdef CONFIG_NVM_DEBUG + pr_info("pblk init: L2P CRC: %x\n", pblk_l2p_crc(pblk)); +#endif + + /* Free full lines directly as GC has not been started yet */ + pblk_gc_free_full_lines(pblk); + if (!line) { /* Configure next line for user data */ line = pblk_line_get_first_data(pblk); @@ -630,7 +656,10 @@ static int pblk_lines_alloc_metadata(struct pblk *pblk) fail_free_emeta: while (--i >= 0) { - vfree(l_mg->eline_meta[i]->buf); + if (l_mg->emeta_alloc_type == PBLK_VMALLOC_META) + vfree(l_mg->eline_meta[i]->buf); + else + kfree(l_mg->eline_meta[i]->buf); kfree(l_mg->eline_meta[i]); } @@ -681,8 +710,8 @@ static int pblk_lines_init(struct pblk *pblk) lm->blk_bitmap_len = BITS_TO_LONGS(geo->nr_luns) * sizeof(long); lm->sec_bitmap_len = BITS_TO_LONGS(lm->sec_per_line) * sizeof(long); lm->lun_bitmap_len = BITS_TO_LONGS(geo->nr_luns) * sizeof(long); - lm->high_thrs = lm->sec_per_line / 2; - lm->mid_thrs = lm->sec_per_line / 4; + lm->mid_thrs = lm->sec_per_line / 2; + lm->high_thrs = lm->sec_per_line / 4; lm->meta_distance = (geo->nr_luns / 2) * pblk->min_write_pgs; /* Calculate necessary pages for smeta. See comment over struct @@ -713,9 +742,13 @@ add_emeta_page: goto add_emeta_page; } - lm->emeta_bb = geo->nr_luns - i; - lm->min_blk_line = 1 + DIV_ROUND_UP(lm->smeta_sec + lm->emeta_sec[0], - geo->sec_per_blk); + lm->emeta_bb = geo->nr_luns > i ? geo->nr_luns - i : 0; + + lm->min_blk_line = 1; + if (geo->nr_luns > 1) + lm->min_blk_line += DIV_ROUND_UP(lm->smeta_sec + + lm->emeta_sec[0], geo->sec_per_blk); + if (lm->min_blk_line > lm->blk_per_line) { pr_err("pblk: config. not supported. Min. LUN in line:%d\n", lm->blk_per_line); @@ -890,6 +923,11 @@ static void pblk_exit(void *private) down_write(&pblk_lock); pblk_gc_exit(pblk); pblk_tear_down(pblk); + +#ifdef CONFIG_NVM_DEBUG + pr_info("pblk exit: L2P CRC: %x\n", pblk_l2p_crc(pblk)); +#endif + pblk_free(pblk); up_write(&pblk_lock); } @@ -911,7 +949,7 @@ static void *pblk_init(struct nvm_tgt_dev *dev, struct gendisk *tdisk, int ret; if (dev->identity.dom & NVM_RSP_L2P) { - pr_err("pblk: device-side L2P table not supported. (%x)\n", + pr_err("pblk: host-side L2P table not supported. (%x)\n", dev->identity.dom); return ERR_PTR(-EINVAL); } @@ -923,6 +961,7 @@ static void *pblk_init(struct nvm_tgt_dev *dev, struct gendisk *tdisk, pblk->dev = dev; pblk->disk = tdisk; pblk->state = PBLK_STATE_RUNNING; + pblk->gc.gc_enabled = 0; spin_lock_init(&pblk->trans_lock); spin_lock_init(&pblk->lock); @@ -944,6 +983,7 @@ static void *pblk_init(struct nvm_tgt_dev *dev, struct gendisk *tdisk, atomic_long_set(&pblk->recov_writes, 0); atomic_long_set(&pblk->recov_writes, 0); atomic_long_set(&pblk->recov_gc_writes, 0); + atomic_long_set(&pblk->recov_gc_reads, 0); #endif atomic_long_set(&pblk->read_failed, 0); @@ -1012,6 +1052,10 @@ static void *pblk_init(struct nvm_tgt_dev *dev, struct gendisk *tdisk, pblk->rwb.nr_entries); wake_up_process(pblk->writer_ts); + + /* Check if we need to start GC */ + pblk_gc_should_kick(pblk); + return pblk; fail_stop_writer: @@ -1044,6 +1088,7 @@ static struct nvm_tgt_type tt_pblk = { .sysfs_init = pblk_sysfs_init, .sysfs_exit = pblk_sysfs_exit, + .owner = THIS_MODULE, }; static int __init pblk_module_init(void) diff --git a/drivers/lightnvm/pblk-map.c b/drivers/lightnvm/pblk-map.c index fddb924..6f3ecde 100644 --- a/drivers/lightnvm/pblk-map.c +++ b/drivers/lightnvm/pblk-map.c @@ -25,16 +25,28 @@ static void pblk_map_page_data(struct pblk *pblk, unsigned int sentry, unsigned int valid_secs) { struct pblk_line *line = pblk_line_get_data(pblk); - struct pblk_emeta *emeta = line->emeta; + struct pblk_emeta *emeta; struct pblk_w_ctx *w_ctx; - __le64 *lba_list = emeta_to_lbas(pblk, emeta->buf); + __le64 *lba_list; u64 paddr; int nr_secs = pblk->min_write_pgs; int i; + if (pblk_line_is_full(line)) { + struct pblk_line *prev_line = line; + + line = pblk_line_replace_data(pblk); + pblk_line_close_meta(pblk, prev_line); + } + + emeta = line->emeta; + lba_list = emeta_to_lbas(pblk, emeta->buf); + paddr = pblk_alloc_page(pblk, line, nr_secs); for (i = 0; i < nr_secs; i++, paddr++) { + __le64 addr_empty = cpu_to_le64(ADDR_EMPTY); + /* ppa to be sent to the device */ ppa_list[i] = addr_to_gen_ppa(pblk, paddr, line->id); @@ -51,22 +63,14 @@ static void pblk_map_page_data(struct pblk *pblk, unsigned int sentry, w_ctx->ppa = ppa_list[i]; meta_list[i].lba = cpu_to_le64(w_ctx->lba); lba_list[paddr] = cpu_to_le64(w_ctx->lba); - line->nr_valid_lbas++; + if (lba_list[paddr] != addr_empty) + line->nr_valid_lbas++; } else { - __le64 addr_empty = cpu_to_le64(ADDR_EMPTY); - lba_list[paddr] = meta_list[i].lba = addr_empty; __pblk_map_invalidate(pblk, line, paddr); } } - if (pblk_line_is_full(line)) { - struct pblk_line *prev_line = line; - - pblk_line_replace_data(pblk); - pblk_line_close_meta(pblk, prev_line); - } - pblk_down_rq(pblk, ppa_list, nr_secs, lun_bitmap); } diff --git a/drivers/lightnvm/pblk-rb.c b/drivers/lightnvm/pblk-rb.c index 9bc3257..b8f78e4 100644 --- a/drivers/lightnvm/pblk-rb.c +++ b/drivers/lightnvm/pblk-rb.c @@ -201,8 +201,7 @@ unsigned int pblk_rb_read_commit(struct pblk_rb *rb, unsigned int nr_entries) return subm; } -static int __pblk_rb_update_l2p(struct pblk_rb *rb, unsigned int *l2p_upd, - unsigned int to_update) +static int __pblk_rb_update_l2p(struct pblk_rb *rb, unsigned int to_update) { struct pblk *pblk = container_of(rb, struct pblk, rwb); struct pblk_line *line; @@ -213,7 +212,7 @@ static int __pblk_rb_update_l2p(struct pblk_rb *rb, unsigned int *l2p_upd, int flags; for (i = 0; i < to_update; i++) { - entry = &rb->entries[*l2p_upd]; + entry = &rb->entries[rb->l2p_update]; w_ctx = &entry->w_ctx; flags = READ_ONCE(entry->w_ctx.flags); @@ -230,7 +229,7 @@ static int __pblk_rb_update_l2p(struct pblk_rb *rb, unsigned int *l2p_upd, line = &pblk->lines[pblk_tgt_ppa_to_line(w_ctx->ppa)]; kref_put(&line->ref, pblk_line_put); clean_wctx(w_ctx); - *l2p_upd = (*l2p_upd + 1) & (rb->nr_entries - 1); + rb->l2p_update = (rb->l2p_update + 1) & (rb->nr_entries - 1); } pblk_rl_out(&pblk->rl, user_io, gc_io); @@ -258,7 +257,7 @@ static int pblk_rb_update_l2p(struct pblk_rb *rb, unsigned int nr_entries, count = nr_entries - space; /* l2p_update used exclusively under rb->w_lock */ - ret = __pblk_rb_update_l2p(rb, &rb->l2p_update, count); + ret = __pblk_rb_update_l2p(rb, count); out: return ret; @@ -280,7 +279,7 @@ void pblk_rb_sync_l2p(struct pblk_rb *rb) sync = smp_load_acquire(&rb->sync); to_update = pblk_rb_ring_count(sync, rb->l2p_update, rb->nr_entries); - __pblk_rb_update_l2p(rb, &rb->l2p_update, to_update); + __pblk_rb_update_l2p(rb, to_update); spin_unlock(&rb->w_lock); } @@ -325,8 +324,8 @@ void pblk_rb_write_entry_user(struct pblk_rb *rb, void *data, } void pblk_rb_write_entry_gc(struct pblk_rb *rb, void *data, - struct pblk_w_ctx w_ctx, struct pblk_line *gc_line, - unsigned int ring_pos) + struct pblk_w_ctx w_ctx, struct pblk_line *line, + u64 paddr, unsigned int ring_pos) { struct pblk *pblk = container_of(rb, struct pblk, rwb); struct pblk_rb_entry *entry; @@ -341,7 +340,7 @@ void pblk_rb_write_entry_gc(struct pblk_rb *rb, void *data, __pblk_rb_write_entry(rb, data, w_ctx, entry); - if (!pblk_update_map_gc(pblk, w_ctx.lba, entry->cacheline, gc_line)) + if (!pblk_update_map_gc(pblk, w_ctx.lba, entry->cacheline, line, paddr)) entry->w_ctx.lba = ADDR_EMPTY; flags = w_ctx.flags | PBLK_WRITTEN_DATA; @@ -355,7 +354,6 @@ static int pblk_rb_sync_point_set(struct pblk_rb *rb, struct bio *bio, { struct pblk_rb_entry *entry; unsigned int subm, sync_point; - int flags; subm = READ_ONCE(rb->subm); @@ -369,12 +367,6 @@ static int pblk_rb_sync_point_set(struct pblk_rb *rb, struct bio *bio, sync_point = (pos == 0) ? (rb->nr_entries - 1) : (pos - 1); entry = &rb->entries[sync_point]; - flags = READ_ONCE(entry->w_ctx.flags); - flags |= PBLK_FLUSH_ENTRY; - - /* Release flags on context. Protect from writes */ - smp_store_release(&entry->w_ctx.flags, flags); - /* Protect syncs */ smp_store_release(&rb->sync_point, sync_point); @@ -454,6 +446,7 @@ static int pblk_rb_may_write_flush(struct pblk_rb *rb, unsigned int nr_entries, /* Protect from read count */ smp_store_release(&rb->mem, mem); + return 1; } @@ -558,12 +551,13 @@ out: * persist data on the write buffer to the media. */ unsigned int pblk_rb_read_to_bio(struct pblk_rb *rb, struct nvm_rq *rqd, - struct bio *bio, unsigned int pos, - unsigned int nr_entries, unsigned int count) + unsigned int pos, unsigned int nr_entries, + unsigned int count) { struct pblk *pblk = container_of(rb, struct pblk, rwb); struct request_queue *q = pblk->dev->q; struct pblk_c_ctx *c_ctx = nvm_rq_to_pdu(rqd); + struct bio *bio = rqd->bio; struct pblk_rb_entry *entry; struct page *page; unsigned int pad = 0, to_read = nr_entries; diff --git a/drivers/lightnvm/pblk-read.c b/drivers/lightnvm/pblk-read.c index d682e89..ca79d8f 100644 --- a/drivers/lightnvm/pblk-read.c +++ b/drivers/lightnvm/pblk-read.c @@ -39,21 +39,15 @@ static int pblk_read_from_cache(struct pblk *pblk, struct bio *bio, } static void pblk_read_ppalist_rq(struct pblk *pblk, struct nvm_rq *rqd, - unsigned long *read_bitmap) + sector_t blba, unsigned long *read_bitmap) { + struct pblk_sec_meta *meta_list = rqd->meta_list; struct bio *bio = rqd->bio; struct ppa_addr ppas[PBLK_MAX_REQ_ADDRS]; - sector_t blba = pblk_get_lba(bio); int nr_secs = rqd->nr_ppas; bool advanced_bio = false; int i, j = 0; - /* logic error: lba out-of-bounds. Ignore read request */ - if (blba + nr_secs >= pblk->rl.nr_secs) { - WARN(1, "pblk: read lbas out of bounds\n"); - return; - } - pblk_lookup_l2p_seq(pblk, ppas, blba, nr_secs); for (i = 0; i < nr_secs; i++) { @@ -63,6 +57,7 @@ static void pblk_read_ppalist_rq(struct pblk *pblk, struct nvm_rq *rqd, retry: if (pblk_ppa_empty(p)) { WARN_ON(test_and_set_bit(i, read_bitmap)); + meta_list[i].lba = cpu_to_le64(ADDR_EMPTY); if (unlikely(!advanced_bio)) { bio_advance(bio, (i) * PBLK_EXPOSED_PAGE_SIZE); @@ -82,6 +77,7 @@ retry: goto retry; } WARN_ON(test_and_set_bit(i, read_bitmap)); + meta_list[i].lba = cpu_to_le64(lba); advanced_bio = true; #ifdef CONFIG_NVM_DEBUG atomic_long_inc(&pblk->cache_reads); @@ -117,10 +113,51 @@ static int pblk_submit_read_io(struct pblk *pblk, struct nvm_rq *rqd) return NVM_IO_OK; } -static void pblk_end_io_read(struct nvm_rq *rqd) +static void pblk_read_check(struct pblk *pblk, struct nvm_rq *rqd, + sector_t blba) +{ + struct pblk_sec_meta *meta_list = rqd->meta_list; + int nr_lbas = rqd->nr_ppas; + int i; + + for (i = 0; i < nr_lbas; i++) { + u64 lba = le64_to_cpu(meta_list[i].lba); + + if (lba == ADDR_EMPTY) + continue; + + WARN(lba != blba + i, "pblk: corrupted read LBA\n"); + } +} + +static void pblk_read_put_rqd_kref(struct pblk *pblk, struct nvm_rq *rqd) +{ + struct ppa_addr *ppa_list; + int i; + + ppa_list = (rqd->nr_ppas > 1) ? rqd->ppa_list : &rqd->ppa_addr; + + for (i = 0; i < rqd->nr_ppas; i++) { + struct ppa_addr ppa = ppa_list[i]; + struct pblk_line *line; + + line = &pblk->lines[pblk_dev_ppa_to_line(ppa)]; + kref_put(&line->ref, pblk_line_put_wq); + } +} + +static void pblk_end_user_read(struct bio *bio) +{ +#ifdef CONFIG_NVM_DEBUG + WARN_ONCE(bio->bi_status, "pblk: corrupted read bio\n"); +#endif + bio_endio(bio); + bio_put(bio); +} + +static void __pblk_end_io_read(struct pblk *pblk, struct nvm_rq *rqd, + bool put_line) { - struct pblk *pblk = rqd->private; - struct nvm_tgt_dev *dev = pblk->dev; struct pblk_g_ctx *r_ctx = nvm_rq_to_pdu(rqd); struct bio *bio = rqd->bio; @@ -131,47 +168,51 @@ static void pblk_end_io_read(struct nvm_rq *rqd) WARN_ONCE(bio->bi_status, "pblk: corrupted read error\n"); #endif - nvm_dev_dma_free(dev->parent, rqd->meta_list, rqd->dma_meta_list); + pblk_read_check(pblk, rqd, r_ctx->lba); bio_put(bio); - if (r_ctx->private) { - struct bio *orig_bio = r_ctx->private; + if (r_ctx->private) + pblk_end_user_read((struct bio *)r_ctx->private); -#ifdef CONFIG_NVM_DEBUG - WARN_ONCE(orig_bio->bi_status, "pblk: corrupted read bio\n"); -#endif - bio_endio(orig_bio); - bio_put(orig_bio); - } + if (put_line) + pblk_read_put_rqd_kref(pblk, rqd); #ifdef CONFIG_NVM_DEBUG atomic_long_add(rqd->nr_ppas, &pblk->sync_reads); atomic_long_sub(rqd->nr_ppas, &pblk->inflight_reads); #endif - pblk_free_rqd(pblk, rqd, READ); + pblk_free_rqd(pblk, rqd, PBLK_READ); atomic_dec(&pblk->inflight_io); } +static void pblk_end_io_read(struct nvm_rq *rqd) +{ + struct pblk *pblk = rqd->private; + + __pblk_end_io_read(pblk, rqd, true); +} + static int pblk_fill_partial_read_bio(struct pblk *pblk, struct nvm_rq *rqd, unsigned int bio_init_idx, unsigned long *read_bitmap) { struct bio *new_bio, *bio = rqd->bio; + struct pblk_sec_meta *meta_list = rqd->meta_list; struct bio_vec src_bv, dst_bv; void *ppa_ptr = NULL; void *src_p, *dst_p; dma_addr_t dma_ppa_list = 0; + __le64 *lba_list_mem, *lba_list_media; int nr_secs = rqd->nr_ppas; int nr_holes = nr_secs - bitmap_weight(read_bitmap, nr_secs); int i, ret, hole; - DECLARE_COMPLETION_ONSTACK(wait); + + /* Re-use allocated memory for intermediate lbas */ + lba_list_mem = (((void *)rqd->ppa_list) + pblk_dma_ppa_size); + lba_list_media = (((void *)rqd->ppa_list) + 2 * pblk_dma_ppa_size); new_bio = bio_alloc(GFP_KERNEL, nr_holes); - if (!new_bio) { - pr_err("pblk: could not alloc read bio\n"); - return NVM_IO_ERR; - } if (pblk_bio_add_pages(pblk, new_bio, GFP_KERNEL, nr_holes)) goto err; @@ -181,34 +222,29 @@ static int pblk_fill_partial_read_bio(struct pblk *pblk, struct nvm_rq *rqd, goto err; } + for (i = 0; i < nr_secs; i++) + lba_list_mem[i] = meta_list[i].lba; + new_bio->bi_iter.bi_sector = 0; /* internal bio */ bio_set_op_attrs(new_bio, REQ_OP_READ, 0); - new_bio->bi_private = &wait; - new_bio->bi_end_io = pblk_end_bio_sync; rqd->bio = new_bio; rqd->nr_ppas = nr_holes; rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM); - rqd->end_io = NULL; - if (unlikely(nr_secs > 1 && nr_holes == 1)) { + if (unlikely(nr_holes == 1)) { ppa_ptr = rqd->ppa_list; dma_ppa_list = rqd->dma_ppa_list; rqd->ppa_addr = rqd->ppa_list[0]; } - ret = pblk_submit_read_io(pblk, rqd); + ret = pblk_submit_io_sync(pblk, rqd); if (ret) { bio_put(rqd->bio); - pr_err("pblk: read IO submission failed\n"); + pr_err("pblk: sync read IO submission failed\n"); goto err; } - if (!wait_for_completion_io_timeout(&wait, - msecs_to_jiffies(PBLK_COMMAND_TIMEOUT_MS))) { - pr_err("pblk: partial read I/O timed out\n"); - } - if (rqd->error) { atomic_long_inc(&pblk->read_failed); #ifdef CONFIG_NVM_DEBUG @@ -216,15 +252,31 @@ static int pblk_fill_partial_read_bio(struct pblk *pblk, struct nvm_rq *rqd, #endif } - if (unlikely(nr_secs > 1 && nr_holes == 1)) { + if (unlikely(nr_holes == 1)) { + struct ppa_addr ppa; + + ppa = rqd->ppa_addr; rqd->ppa_list = ppa_ptr; rqd->dma_ppa_list = dma_ppa_list; + rqd->ppa_list[0] = ppa; + } + + for (i = 0; i < nr_secs; i++) { + lba_list_media[i] = meta_list[i].lba; + meta_list[i].lba = lba_list_mem[i]; } /* Fill the holes in the original bio */ i = 0; hole = find_first_zero_bit(read_bitmap, nr_secs); do { + int line_id = pblk_dev_ppa_to_line(rqd->ppa_list[i]); + struct pblk_line *line = &pblk->lines[line_id]; + + kref_put(&line->ref, pblk_line_put); + + meta_list[hole].lba = lba_list_media[i]; + src_bv = new_bio->bi_io_vec[i++]; dst_bv = bio->bi_io_vec[bio_init_idx + hole]; @@ -238,7 +290,7 @@ static int pblk_fill_partial_read_bio(struct pblk *pblk, struct nvm_rq *rqd, kunmap_atomic(src_p); kunmap_atomic(dst_p); - mempool_free(src_bv.bv_page, pblk->page_pool); + mempool_free(src_bv.bv_page, pblk->page_bio_pool); hole = find_next_zero_bit(read_bitmap, nr_secs, hole + 1); } while (hole < nr_secs); @@ -246,34 +298,26 @@ static int pblk_fill_partial_read_bio(struct pblk *pblk, struct nvm_rq *rqd, bio_put(new_bio); /* Complete the original bio and associated request */ + bio_endio(bio); rqd->bio = bio; rqd->nr_ppas = nr_secs; - rqd->private = pblk; - bio_endio(bio); - pblk_end_io_read(rqd); + __pblk_end_io_read(pblk, rqd, false); return NVM_IO_OK; err: /* Free allocated pages in new bio */ pblk_bio_free_pages(pblk, bio, 0, new_bio->bi_vcnt); - rqd->private = pblk; - pblk_end_io_read(rqd); + __pblk_end_io_read(pblk, rqd, false); return NVM_IO_ERR; } static void pblk_read_rq(struct pblk *pblk, struct nvm_rq *rqd, - unsigned long *read_bitmap) + sector_t lba, unsigned long *read_bitmap) { + struct pblk_sec_meta *meta_list = rqd->meta_list; struct bio *bio = rqd->bio; struct ppa_addr ppa; - sector_t lba = pblk_get_lba(bio); - - /* logic error: lba out-of-bounds. Ignore read request */ - if (lba >= pblk->rl.nr_secs) { - WARN(1, "pblk: read lba out of bounds\n"); - return; - } pblk_lookup_l2p_seq(pblk, &ppa, lba, 1); @@ -284,6 +328,7 @@ static void pblk_read_rq(struct pblk *pblk, struct nvm_rq *rqd, retry: if (pblk_ppa_empty(ppa)) { WARN_ON(test_and_set_bit(0, read_bitmap)); + meta_list[0].lba = cpu_to_le64(ADDR_EMPTY); return; } @@ -295,9 +340,12 @@ retry: pblk_lookup_l2p_seq(pblk, &ppa, lba, 1); goto retry; } + WARN_ON(test_and_set_bit(0, read_bitmap)); + meta_list[0].lba = cpu_to_le64(lba); + #ifdef CONFIG_NVM_DEBUG - atomic_long_inc(&pblk->cache_reads); + atomic_long_inc(&pblk->cache_reads); #endif } else { rqd->ppa_addr = ppa; @@ -309,22 +357,24 @@ retry: int pblk_submit_read(struct pblk *pblk, struct bio *bio) { struct nvm_tgt_dev *dev = pblk->dev; + sector_t blba = pblk_get_lba(bio); unsigned int nr_secs = pblk_get_secs(bio); + struct pblk_g_ctx *r_ctx; struct nvm_rq *rqd; - unsigned long read_bitmap; /* Max 64 ppas per request */ unsigned int bio_init_idx; + unsigned long read_bitmap; /* Max 64 ppas per request */ int ret = NVM_IO_ERR; - if (nr_secs > PBLK_MAX_REQ_ADDRS) + /* logic error: lba out-of-bounds. Ignore read request */ + if (blba >= pblk->rl.nr_secs || nr_secs > PBLK_MAX_REQ_ADDRS) { + WARN(1, "pblk: read lba out of bounds (lba:%llu, nr:%d)\n", + (unsigned long long)blba, nr_secs); return NVM_IO_ERR; + } bitmap_zero(&read_bitmap, nr_secs); - rqd = pblk_alloc_rqd(pblk, READ); - if (IS_ERR(rqd)) { - pr_err_ratelimited("pblk: not able to alloc rqd"); - return NVM_IO_ERR; - } + rqd = pblk_alloc_rqd(pblk, PBLK_READ); rqd->opcode = NVM_OP_PREAD; rqd->bio = bio; @@ -332,6 +382,9 @@ int pblk_submit_read(struct pblk *pblk, struct bio *bio) rqd->private = pblk; rqd->end_io = pblk_end_io_read; + r_ctx = nvm_rq_to_pdu(rqd); + r_ctx->lba = blba; + /* Save the index for this bio's start. This is needed in case * we need to fill a partial read. */ @@ -348,23 +401,22 @@ int pblk_submit_read(struct pblk *pblk, struct bio *bio) rqd->ppa_list = rqd->meta_list + pblk_dma_meta_size; rqd->dma_ppa_list = rqd->dma_meta_list + pblk_dma_meta_size; - pblk_read_ppalist_rq(pblk, rqd, &read_bitmap); + pblk_read_ppalist_rq(pblk, rqd, blba, &read_bitmap); } else { - pblk_read_rq(pblk, rqd, &read_bitmap); + pblk_read_rq(pblk, rqd, blba, &read_bitmap); } bio_get(bio); if (bitmap_full(&read_bitmap, nr_secs)) { bio_endio(bio); atomic_inc(&pblk->inflight_io); - pblk_end_io_read(rqd); + __pblk_end_io_read(pblk, rqd, false); return NVM_IO_OK; } /* All sectors are to be read from the device */ if (bitmap_empty(&read_bitmap, rqd->nr_ppas)) { struct bio *int_bio = NULL; - struct pblk_g_ctx *r_ctx = nvm_rq_to_pdu(rqd); /* Clone read bio to deal with read errors internally */ int_bio = bio_clone_fast(bio, GFP_KERNEL, pblk_bio_set); @@ -399,40 +451,46 @@ int pblk_submit_read(struct pblk *pblk, struct bio *bio) return NVM_IO_OK; fail_rqd_free: - pblk_free_rqd(pblk, rqd, READ); + pblk_free_rqd(pblk, rqd, PBLK_READ); return ret; } static int read_ppalist_rq_gc(struct pblk *pblk, struct nvm_rq *rqd, struct pblk_line *line, u64 *lba_list, - unsigned int nr_secs) + u64 *paddr_list_gc, unsigned int nr_secs) { - struct ppa_addr ppas[PBLK_MAX_REQ_ADDRS]; + struct ppa_addr ppa_list_l2p[PBLK_MAX_REQ_ADDRS]; + struct ppa_addr ppa_gc; int valid_secs = 0; int i; - pblk_lookup_l2p_rand(pblk, ppas, lba_list, nr_secs); + pblk_lookup_l2p_rand(pblk, ppa_list_l2p, lba_list, nr_secs); for (i = 0; i < nr_secs; i++) { - if (pblk_addr_in_cache(ppas[i]) || ppas[i].g.blk != line->id || - pblk_ppa_empty(ppas[i])) { - lba_list[i] = ADDR_EMPTY; + if (lba_list[i] == ADDR_EMPTY) + continue; + + ppa_gc = addr_to_gen_ppa(pblk, paddr_list_gc[i], line->id); + if (!pblk_ppa_comp(ppa_list_l2p[i], ppa_gc)) { + paddr_list_gc[i] = lba_list[i] = ADDR_EMPTY; continue; } - rqd->ppa_list[valid_secs++] = ppas[i]; + rqd->ppa_list[valid_secs++] = ppa_list_l2p[i]; } #ifdef CONFIG_NVM_DEBUG atomic_long_add(valid_secs, &pblk->inflight_reads); #endif + return valid_secs; } static int read_rq_gc(struct pblk *pblk, struct nvm_rq *rqd, - struct pblk_line *line, sector_t lba) + struct pblk_line *line, sector_t lba, + u64 paddr_gc) { - struct ppa_addr ppa; + struct ppa_addr ppa_l2p, ppa_gc; int valid_secs = 0; if (lba == ADDR_EMPTY) @@ -445,15 +503,14 @@ static int read_rq_gc(struct pblk *pblk, struct nvm_rq *rqd, } spin_lock(&pblk->trans_lock); - ppa = pblk_trans_map_get(pblk, lba); + ppa_l2p = pblk_trans_map_get(pblk, lba); spin_unlock(&pblk->trans_lock); - /* Ignore updated values until the moment */ - if (pblk_addr_in_cache(ppa) || ppa.g.blk != line->id || - pblk_ppa_empty(ppa)) + ppa_gc = addr_to_gen_ppa(pblk, paddr_gc, line->id); + if (!pblk_ppa_comp(ppa_l2p, ppa_gc)) goto out; - rqd->ppa_addr = ppa; + rqd->ppa_addr = ppa_l2p; valid_secs = 1; #ifdef CONFIG_NVM_DEBUG @@ -464,42 +521,44 @@ out: return valid_secs; } -int pblk_submit_read_gc(struct pblk *pblk, u64 *lba_list, void *data, - unsigned int nr_secs, unsigned int *secs_to_gc, - struct pblk_line *line) +int pblk_submit_read_gc(struct pblk *pblk, struct pblk_gc_rq *gc_rq) { struct nvm_tgt_dev *dev = pblk->dev; struct nvm_geo *geo = &dev->geo; struct bio *bio; struct nvm_rq rqd; - int ret, data_len; - DECLARE_COMPLETION_ONSTACK(wait); + int data_len; + int ret = NVM_IO_OK; memset(&rqd, 0, sizeof(struct nvm_rq)); rqd.meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL, &rqd.dma_meta_list); if (!rqd.meta_list) - return NVM_IO_ERR; + return -ENOMEM; - if (nr_secs > 1) { + if (gc_rq->nr_secs > 1) { rqd.ppa_list = rqd.meta_list + pblk_dma_meta_size; rqd.dma_ppa_list = rqd.dma_meta_list + pblk_dma_meta_size; - *secs_to_gc = read_ppalist_rq_gc(pblk, &rqd, line, lba_list, - nr_secs); - if (*secs_to_gc == 1) + gc_rq->secs_to_gc = read_ppalist_rq_gc(pblk, &rqd, gc_rq->line, + gc_rq->lba_list, + gc_rq->paddr_list, + gc_rq->nr_secs); + if (gc_rq->secs_to_gc == 1) rqd.ppa_addr = rqd.ppa_list[0]; } else { - *secs_to_gc = read_rq_gc(pblk, &rqd, line, lba_list[0]); + gc_rq->secs_to_gc = read_rq_gc(pblk, &rqd, gc_rq->line, + gc_rq->lba_list[0], + gc_rq->paddr_list[0]); } - if (!(*secs_to_gc)) + if (!(gc_rq->secs_to_gc)) goto out; - data_len = (*secs_to_gc) * geo->sec_size; - bio = pblk_bio_map_addr(pblk, data, *secs_to_gc, data_len, - PBLK_KMALLOC_META, GFP_KERNEL); + data_len = (gc_rq->secs_to_gc) * geo->sec_size; + bio = pblk_bio_map_addr(pblk, gc_rq->data, gc_rq->secs_to_gc, data_len, + PBLK_VMALLOC_META, GFP_KERNEL); if (IS_ERR(bio)) { pr_err("pblk: could not allocate GC bio (%lu)\n", PTR_ERR(bio)); goto err_free_dma; @@ -509,23 +568,16 @@ int pblk_submit_read_gc(struct pblk *pblk, u64 *lba_list, void *data, bio_set_op_attrs(bio, REQ_OP_READ, 0); rqd.opcode = NVM_OP_PREAD; - rqd.end_io = pblk_end_io_sync; - rqd.private = &wait; - rqd.nr_ppas = *secs_to_gc; + rqd.nr_ppas = gc_rq->secs_to_gc; rqd.flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM); rqd.bio = bio; - ret = pblk_submit_read_io(pblk, &rqd); - if (ret) { - bio_endio(bio); + if (pblk_submit_io_sync(pblk, &rqd)) { + ret = -EIO; pr_err("pblk: GC read request failed\n"); - goto err_free_dma; + goto err_free_bio; } - if (!wait_for_completion_io_timeout(&wait, - msecs_to_jiffies(PBLK_COMMAND_TIMEOUT_MS))) { - pr_err("pblk: GC read I/O timed out\n"); - } atomic_dec(&pblk->inflight_io); if (rqd.error) { @@ -536,16 +588,18 @@ int pblk_submit_read_gc(struct pblk *pblk, u64 *lba_list, void *data, } #ifdef CONFIG_NVM_DEBUG - atomic_long_add(*secs_to_gc, &pblk->sync_reads); - atomic_long_add(*secs_to_gc, &pblk->recov_gc_reads); - atomic_long_sub(*secs_to_gc, &pblk->inflight_reads); + atomic_long_add(gc_rq->secs_to_gc, &pblk->sync_reads); + atomic_long_add(gc_rq->secs_to_gc, &pblk->recov_gc_reads); + atomic_long_sub(gc_rq->secs_to_gc, &pblk->inflight_reads); #endif out: nvm_dev_dma_free(dev->parent, rqd.meta_list, rqd.dma_meta_list); - return NVM_IO_OK; + return ret; +err_free_bio: + bio_put(bio); err_free_dma: nvm_dev_dma_free(dev->parent, rqd.meta_list, rqd.dma_meta_list); - return NVM_IO_ERR; + return ret; } diff --git a/drivers/lightnvm/pblk-recovery.c b/drivers/lightnvm/pblk-recovery.c index cb556e0..eadb3eb 100644 --- a/drivers/lightnvm/pblk-recovery.c +++ b/drivers/lightnvm/pblk-recovery.c @@ -34,10 +34,6 @@ void pblk_submit_rec(struct work_struct *work) max_secs); bio = bio_alloc(GFP_KERNEL, nr_rec_secs); - if (!bio) { - pr_err("pblk: not able to create recovery bio\n"); - return; - } bio->bi_iter.bi_sector = 0; bio_set_op_attrs(bio, REQ_OP_WRITE, 0); @@ -71,7 +67,7 @@ void pblk_submit_rec(struct work_struct *work) err: bio_put(bio); - pblk_free_rqd(pblk, rqd, WRITE); + pblk_free_rqd(pblk, rqd, PBLK_WRITE); } int pblk_recov_setup_rq(struct pblk *pblk, struct pblk_c_ctx *c_ctx, @@ -84,12 +80,7 @@ int pblk_recov_setup_rq(struct pblk *pblk, struct pblk_c_ctx *c_ctx, struct pblk_c_ctx *rec_ctx; int nr_entries = c_ctx->nr_valid + c_ctx->nr_padded; - rec_rqd = pblk_alloc_rqd(pblk, WRITE); - if (IS_ERR(rec_rqd)) { - pr_err("pblk: could not create recovery req.\n"); - return -ENOMEM; - } - + rec_rqd = pblk_alloc_rqd(pblk, PBLK_WRITE); rec_ctx = nvm_rq_to_pdu(rec_rqd); /* Copy completion bitmap, but exclude the first X completed entries */ @@ -142,19 +133,19 @@ static int pblk_recov_l2p_from_emeta(struct pblk *pblk, struct pblk_line *line) struct pblk_emeta *emeta = line->emeta; struct line_emeta *emeta_buf = emeta->buf; __le64 *lba_list; - int data_start; - int nr_data_lbas, nr_valid_lbas, nr_lbas = 0; - int i; + u64 data_start, data_end; + u64 nr_valid_lbas, nr_lbas = 0; + u64 i; lba_list = pblk_recov_get_lba_list(pblk, emeta_buf); if (!lba_list) return 1; data_start = pblk_line_smeta_start(pblk, line) + lm->smeta_sec; - nr_data_lbas = lm->sec_per_line - lm->emeta_sec[0]; + data_end = line->emeta_ssec; nr_valid_lbas = le64_to_cpu(emeta_buf->nr_valid_lbas); - for (i = data_start; i < nr_data_lbas && nr_lbas < nr_valid_lbas; i++) { + for (i = data_start; i < data_end; i++) { struct ppa_addr ppa; int pos; @@ -181,8 +172,8 @@ static int pblk_recov_l2p_from_emeta(struct pblk *pblk, struct pblk_line *line) } if (nr_valid_lbas != nr_lbas) - pr_err("pblk: line %d - inconsistent lba list(%llu/%d)\n", - line->id, emeta_buf->nr_valid_lbas, nr_lbas); + pr_err("pblk: line %d - inconsistent lba list(%llu/%llu)\n", + line->id, nr_valid_lbas, nr_lbas); line->left_msecs = 0; @@ -225,7 +216,6 @@ static int pblk_recov_read_oob(struct pblk *pblk, struct pblk_line *line, int rq_ppas, rq_len; int i, j; int ret = 0; - DECLARE_COMPLETION_ONSTACK(wait); ppa_list = p.ppa_list; meta_list = p.meta_list; @@ -262,8 +252,6 @@ next_read_rq: rqd->ppa_list = ppa_list; rqd->dma_ppa_list = dma_ppa_list; rqd->dma_meta_list = dma_meta_list; - rqd->end_io = pblk_end_io_sync; - rqd->private = &wait; if (pblk_io_aligned(pblk, rq_ppas)) rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_SEQUENTIAL); @@ -289,19 +277,13 @@ next_read_rq: } /* If read fails, more padding is needed */ - ret = pblk_submit_io(pblk, rqd); + ret = pblk_submit_io_sync(pblk, rqd); if (ret) { pr_err("pblk: I/O submission failed: %d\n", ret); return ret; } - if (!wait_for_completion_io_timeout(&wait, - msecs_to_jiffies(PBLK_COMMAND_TIMEOUT_MS))) { - pr_err("pblk: L2P recovery read timed out\n"); - return -EINTR; - } atomic_dec(&pblk->inflight_io); - reinit_completion(&wait); /* At this point, the read should not fail. If it does, it is a problem * we cannot recover from here. Need FTL log. @@ -338,13 +320,10 @@ static void pblk_end_io_recov(struct nvm_rq *rqd) { struct pblk_pad_rq *pad_rq = rqd->private; struct pblk *pblk = pad_rq->pblk; - struct nvm_tgt_dev *dev = pblk->dev; pblk_up_page(pblk, rqd->ppa_list, rqd->nr_ppas); - bio_put(rqd->bio); - nvm_dev_dma_free(dev->parent, rqd->meta_list, rqd->dma_meta_list); - pblk_free_rqd(pblk, rqd, WRITE); + pblk_free_rqd(pblk, rqd, PBLK_WRITE_INT); atomic_dec(&pblk->inflight_io); kref_put(&pad_rq->ref, pblk_recov_complete); @@ -404,25 +383,21 @@ next_pad_rq: ppa_list = (void *)(meta_list) + pblk_dma_meta_size; dma_ppa_list = dma_meta_list + pblk_dma_meta_size; - rqd = pblk_alloc_rqd(pblk, WRITE); - if (IS_ERR(rqd)) { - ret = PTR_ERR(rqd); - goto fail_free_meta; - } - bio = pblk_bio_map_addr(pblk, data, rq_ppas, rq_len, PBLK_VMALLOC_META, GFP_KERNEL); if (IS_ERR(bio)) { ret = PTR_ERR(bio); - goto fail_free_rqd; + goto fail_free_meta; } bio->bi_iter.bi_sector = 0; /* internal bio */ bio_set_op_attrs(bio, REQ_OP_WRITE, 0); + rqd = pblk_alloc_rqd(pblk, PBLK_WRITE_INT); + rqd->bio = bio; rqd->opcode = NVM_OP_PWRITE; - rqd->flags = pblk_set_progr_mode(pblk, WRITE); + rqd->flags = pblk_set_progr_mode(pblk, PBLK_WRITE); rqd->meta_list = meta_list; rqd->nr_ppas = rq_ppas; rqd->ppa_list = ppa_list; @@ -490,8 +465,6 @@ free_rq: fail_free_bio: bio_put(bio); -fail_free_rqd: - pblk_free_rqd(pblk, rqd, WRITE); fail_free_meta: nvm_dev_dma_free(dev->parent, meta_list, dma_meta_list); fail_free_pad: @@ -522,7 +495,6 @@ static int pblk_recov_scan_all_oob(struct pblk *pblk, struct pblk_line *line, int ret = 0; int rec_round; int left_ppas = pblk_calc_sec_in_line(pblk, line) - line->cur_sec; - DECLARE_COMPLETION_ONSTACK(wait); ppa_list = p.ppa_list; meta_list = p.meta_list; @@ -557,8 +529,6 @@ next_rq: rqd->ppa_list = ppa_list; rqd->dma_ppa_list = dma_ppa_list; rqd->dma_meta_list = dma_meta_list; - rqd->end_io = pblk_end_io_sync; - rqd->private = &wait; if (pblk_io_aligned(pblk, rq_ppas)) rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_SEQUENTIAL); @@ -584,18 +554,13 @@ next_rq: addr_to_gen_ppa(pblk, w_ptr, line->id); } - ret = pblk_submit_io(pblk, rqd); + ret = pblk_submit_io_sync(pblk, rqd); if (ret) { pr_err("pblk: I/O submission failed: %d\n", ret); return ret; } - if (!wait_for_completion_io_timeout(&wait, - msecs_to_jiffies(PBLK_COMMAND_TIMEOUT_MS))) { - pr_err("pblk: L2P recovery read timed out\n"); - } atomic_dec(&pblk->inflight_io); - reinit_completion(&wait); /* This should not happen since the read failed during normal recovery, * but the media works funny sometimes... @@ -663,7 +628,6 @@ static int pblk_recov_scan_oob(struct pblk *pblk, struct pblk_line *line, int i, j; int ret = 0; int left_ppas = pblk_calc_sec_in_line(pblk, line); - DECLARE_COMPLETION_ONSTACK(wait); ppa_list = p.ppa_list; meta_list = p.meta_list; @@ -696,8 +660,6 @@ next_rq: rqd->ppa_list = ppa_list; rqd->dma_ppa_list = dma_ppa_list; rqd->dma_meta_list = dma_meta_list; - rqd->end_io = pblk_end_io_sync; - rqd->private = &wait; if (pblk_io_aligned(pblk, rq_ppas)) rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_SEQUENTIAL); @@ -723,19 +685,14 @@ next_rq: addr_to_gen_ppa(pblk, paddr, line->id); } - ret = pblk_submit_io(pblk, rqd); + ret = pblk_submit_io_sync(pblk, rqd); if (ret) { pr_err("pblk: I/O submission failed: %d\n", ret); bio_put(bio); return ret; } - if (!wait_for_completion_io_timeout(&wait, - msecs_to_jiffies(PBLK_COMMAND_TIMEOUT_MS))) { - pr_err("pblk: L2P recovery read timed out\n"); - } atomic_dec(&pblk->inflight_io); - reinit_completion(&wait); /* Reached the end of the written line */ if (rqd->error) { @@ -785,15 +742,9 @@ static int pblk_recov_l2p_from_oob(struct pblk *pblk, struct pblk_line *line) dma_addr_t dma_ppa_list, dma_meta_list; int done, ret = 0; - rqd = pblk_alloc_rqd(pblk, READ); - if (IS_ERR(rqd)) - return PTR_ERR(rqd); - meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL, &dma_meta_list); - if (!meta_list) { - ret = -ENOMEM; - goto free_rqd; - } + if (!meta_list) + return -ENOMEM; ppa_list = (void *)(meta_list) + pblk_dma_meta_size; dma_ppa_list = dma_meta_list + pblk_dma_meta_size; @@ -804,6 +755,8 @@ static int pblk_recov_l2p_from_oob(struct pblk *pblk, struct pblk_line *line) goto free_meta_list; } + rqd = pblk_alloc_rqd(pblk, PBLK_READ); + p.ppa_list = ppa_list; p.meta_list = meta_list; p.rqd = rqd; @@ -832,8 +785,6 @@ out: kfree(data); free_meta_list: nvm_dev_dma_free(dev->parent, meta_list, dma_meta_list); -free_rqd: - pblk_free_rqd(pblk, rqd, READ); return ret; } @@ -851,11 +802,33 @@ static void pblk_recov_line_add_ordered(struct list_head *head, __list_add(&line->list, t->list.prev, &t->list); } -struct pblk_line *pblk_recov_l2p(struct pblk *pblk) +static u64 pblk_line_emeta_start(struct pblk *pblk, struct pblk_line *line) { struct nvm_tgt_dev *dev = pblk->dev; struct nvm_geo *geo = &dev->geo; struct pblk_line_meta *lm = &pblk->lm; + unsigned int emeta_secs; + u64 emeta_start; + struct ppa_addr ppa; + int pos; + + emeta_secs = lm->emeta_sec[0]; + emeta_start = lm->sec_per_line; + + while (emeta_secs) { + emeta_start--; + ppa = addr_to_pblk_ppa(pblk, emeta_start, line->id); + pos = pblk_ppa_to_pos(geo, ppa); + if (!test_bit(pos, line->blk_bitmap)) + emeta_secs--; + } + + return emeta_start; +} + +struct pblk_line *pblk_recov_l2p(struct pblk *pblk) +{ + struct pblk_line_meta *lm = &pblk->lm; struct pblk_line_mgmt *l_mg = &pblk->l_mg; struct pblk_line *line, *tline, *data_line = NULL; struct pblk_smeta *smeta; @@ -900,9 +873,9 @@ struct pblk_line *pblk_recov_l2p(struct pblk *pblk) if (le32_to_cpu(smeta_buf->header.identifier) != PBLK_MAGIC) continue; - if (le16_to_cpu(smeta_buf->header.version) != 1) { + if (smeta_buf->header.version != SMETA_VERSION) { pr_err("pblk: found incompatible line version %u\n", - smeta_buf->header.version); + le16_to_cpu(smeta_buf->header.version)); return ERR_PTR(-EINVAL); } @@ -954,15 +927,9 @@ struct pblk_line *pblk_recov_l2p(struct pblk *pblk) /* Verify closed blocks and recover this portion of L2P table*/ list_for_each_entry_safe(line, tline, &recov_list, list) { - int off, nr_bb; - recovered_lines++; - /* Calculate where emeta starts based on the line bb */ - off = lm->sec_per_line - lm->emeta_sec[0]; - nr_bb = bitmap_weight(line->blk_bitmap, lm->blk_per_line); - off -= nr_bb * geo->sec_per_pl; - line->emeta_ssec = off; + line->emeta_ssec = pblk_line_emeta_start(pblk, line); line->emeta = emeta; memset(line->emeta->buf, 0, lm->emeta_len[0]); @@ -987,7 +954,7 @@ next: list_move_tail(&line->list, move_list); spin_unlock(&l_mg->gc_lock); - mempool_free(line->map_bitmap, pblk->line_meta_pool); + kfree(line->map_bitmap); line->map_bitmap = NULL; line->smeta = NULL; line->emeta = NULL; diff --git a/drivers/lightnvm/pblk-rl.c b/drivers/lightnvm/pblk-rl.c index 2e6a536..abae31f 100644 --- a/drivers/lightnvm/pblk-rl.c +++ b/drivers/lightnvm/pblk-rl.c @@ -96,9 +96,11 @@ unsigned long pblk_rl_nr_free_blks(struct pblk_rl *rl) * * Only the total number of free blocks is used to configure the rate limiter. */ -static int pblk_rl_update_rates(struct pblk_rl *rl, unsigned long max) +void pblk_rl_update_rates(struct pblk_rl *rl) { + struct pblk *pblk = container_of(rl, struct pblk, rl); unsigned long free_blocks = pblk_rl_nr_free_blks(rl); + int max = rl->rb_budget; if (free_blocks >= rl->high) { rl->rb_user_max = max; @@ -124,23 +126,18 @@ static int pblk_rl_update_rates(struct pblk_rl *rl, unsigned long max) rl->rb_state = PBLK_RL_LOW; } - return rl->rb_state; + if (rl->rb_state == (PBLK_RL_MID | PBLK_RL_LOW)) + pblk_gc_should_start(pblk); + else + pblk_gc_should_stop(pblk); } void pblk_rl_free_lines_inc(struct pblk_rl *rl, struct pblk_line *line) { - struct pblk *pblk = container_of(rl, struct pblk, rl); int blk_in_line = atomic_read(&line->blk_in_line); - int ret; atomic_add(blk_in_line, &rl->free_blocks); - /* Rates will not change that often - no need to lock update */ - ret = pblk_rl_update_rates(rl, rl->rb_budget); - - if (ret == (PBLK_RL_MID | PBLK_RL_LOW)) - pblk_gc_should_start(pblk); - else - pblk_gc_should_stop(pblk); + pblk_rl_update_rates(rl); } void pblk_rl_free_lines_dec(struct pblk_rl *rl, struct pblk_line *line) @@ -148,19 +145,7 @@ void pblk_rl_free_lines_dec(struct pblk_rl *rl, struct pblk_line *line) int blk_in_line = atomic_read(&line->blk_in_line); atomic_sub(blk_in_line, &rl->free_blocks); -} - -void pblk_gc_should_kick(struct pblk *pblk) -{ - struct pblk_rl *rl = &pblk->rl; - int ret; - - /* Rates will not change that often - no need to lock update */ - ret = pblk_rl_update_rates(rl, rl->rb_budget); - if (ret == (PBLK_RL_MID | PBLK_RL_LOW)) - pblk_gc_should_start(pblk); - else - pblk_gc_should_stop(pblk); + pblk_rl_update_rates(rl); } int pblk_rl_high_thrs(struct pblk_rl *rl) @@ -168,14 +153,9 @@ int pblk_rl_high_thrs(struct pblk_rl *rl) return rl->high; } -int pblk_rl_low_thrs(struct pblk_rl *rl) -{ - return rl->low; -} - -int pblk_rl_sysfs_rate_show(struct pblk_rl *rl) +int pblk_rl_max_io(struct pblk_rl *rl) { - return rl->rb_user_max; + return rl->rb_max_io; } static void pblk_rl_u_timer(unsigned long data) @@ -214,6 +194,7 @@ void pblk_rl_init(struct pblk_rl *rl, int budget) /* To start with, all buffer is available to user I/O writers */ rl->rb_budget = budget; rl->rb_user_max = budget; + rl->rb_max_io = budget >> 1; rl->rb_gc_max = 0; rl->rb_state = PBLK_RL_HIGH; diff --git a/drivers/lightnvm/pblk-sysfs.c b/drivers/lightnvm/pblk-sysfs.c index 95fb434..cd49e88 100644 --- a/drivers/lightnvm/pblk-sysfs.c +++ b/drivers/lightnvm/pblk-sysfs.c @@ -253,7 +253,7 @@ static ssize_t pblk_sysfs_lines(struct pblk *pblk, char *page) sz += snprintf(page + sz, PAGE_SIZE - sz, "GC: full:%d, high:%d, mid:%d, low:%d, empty:%d, queue:%d\n", gc_full, gc_high, gc_mid, gc_low, gc_empty, - atomic_read(&pblk->gc.inflight_gc)); + atomic_read(&pblk->gc.read_inflight_gc)); sz += snprintf(page + sz, PAGE_SIZE - sz, "data (%d) cur:%d, left:%d, vsc:%d, s:%d, map:%d/%d (%d)\n", diff --git a/drivers/lightnvm/pblk-write.c b/drivers/lightnvm/pblk-write.c index 3ad9e56..6c1cafa 100644 --- a/drivers/lightnvm/pblk-write.c +++ b/drivers/lightnvm/pblk-write.c @@ -20,7 +20,6 @@ static unsigned long pblk_end_w_bio(struct pblk *pblk, struct nvm_rq *rqd, struct pblk_c_ctx *c_ctx) { - struct nvm_tgt_dev *dev = pblk->dev; struct bio *original_bio; unsigned long ret; int i; @@ -33,16 +32,18 @@ static unsigned long pblk_end_w_bio(struct pblk *pblk, struct nvm_rq *rqd, bio_endio(original_bio); } + if (c_ctx->nr_padded) + pblk_bio_free_pages(pblk, rqd->bio, c_ctx->nr_valid, + c_ctx->nr_padded); + #ifdef CONFIG_NVM_DEBUG - atomic_long_add(c_ctx->nr_valid, &pblk->sync_writes); + atomic_long_add(rqd->nr_ppas, &pblk->sync_writes); #endif ret = pblk_rb_sync_advance(&pblk->rwb, c_ctx->nr_valid); - nvm_dev_dma_free(dev->parent, rqd->meta_list, rqd->dma_meta_list); - bio_put(rqd->bio); - pblk_free_rqd(pblk, rqd, WRITE); + pblk_free_rqd(pblk, rqd, PBLK_WRITE); return ret; } @@ -107,10 +108,7 @@ static void pblk_end_w_fail(struct pblk *pblk, struct nvm_rq *rqd) ppa_list = &rqd->ppa_addr; recovery = mempool_alloc(pblk->rec_pool, GFP_ATOMIC); - if (!recovery) { - pr_err("pblk: could not allocate recovery context\n"); - return; - } + INIT_LIST_HEAD(&recovery->failed); bit = -1; @@ -175,7 +173,6 @@ static void pblk_end_io_write(struct nvm_rq *rqd) static void pblk_end_io_write_meta(struct nvm_rq *rqd) { struct pblk *pblk = rqd->private; - struct nvm_tgt_dev *dev = pblk->dev; struct pblk_g_ctx *m_ctx = nvm_rq_to_pdu(rqd); struct pblk_line *line = m_ctx->private; struct pblk_emeta *emeta = line->emeta; @@ -187,19 +184,13 @@ static void pblk_end_io_write_meta(struct nvm_rq *rqd) pblk_log_write_err(pblk, rqd); pr_err("pblk: metadata I/O failed. Line %d\n", line->id); } -#ifdef CONFIG_NVM_DEBUG - else - WARN_ONCE(rqd->bio->bi_status, "pblk: corrupted write error\n"); -#endif sync = atomic_add_return(rqd->nr_ppas, &emeta->sync); if (sync == emeta->nr_entries) - pblk_line_run_ws(pblk, line, NULL, pblk_line_close_ws, - pblk->close_wq); + pblk_gen_run_ws(pblk, line, NULL, pblk_line_close_ws, + GFP_ATOMIC, pblk->close_wq); - bio_put(rqd->bio); - nvm_dev_dma_free(dev->parent, rqd->meta_list, rqd->dma_meta_list); - pblk_free_rqd(pblk, rqd, READ); + pblk_free_rqd(pblk, rqd, PBLK_WRITE_INT); atomic_dec(&pblk->inflight_io); } @@ -213,7 +204,7 @@ static int pblk_alloc_w_rq(struct pblk *pblk, struct nvm_rq *rqd, /* Setup write request */ rqd->opcode = NVM_OP_PWRITE; rqd->nr_ppas = nr_secs; - rqd->flags = pblk_set_progr_mode(pblk, WRITE); + rqd->flags = pblk_set_progr_mode(pblk, PBLK_WRITE); rqd->private = pblk; rqd->end_io = end_io; @@ -229,15 +220,16 @@ static int pblk_alloc_w_rq(struct pblk *pblk, struct nvm_rq *rqd, } static int pblk_setup_w_rq(struct pblk *pblk, struct nvm_rq *rqd, - struct pblk_c_ctx *c_ctx, struct ppa_addr *erase_ppa) + struct ppa_addr *erase_ppa) { struct pblk_line_meta *lm = &pblk->lm; struct pblk_line *e_line = pblk_line_get_erase(pblk); + struct pblk_c_ctx *c_ctx = nvm_rq_to_pdu(rqd); unsigned int valid = c_ctx->nr_valid; unsigned int padded = c_ctx->nr_padded; unsigned int nr_secs = valid + padded; unsigned long *lun_bitmap; - int ret = 0; + int ret; lun_bitmap = kzalloc(lm->lun_bitmap_len, GFP_KERNEL); if (!lun_bitmap) @@ -279,7 +271,7 @@ int pblk_setup_w_rec_rq(struct pblk *pblk, struct nvm_rq *rqd, pblk_map_rq(pblk, rqd, c_ctx->sentry, lun_bitmap, c_ctx->nr_valid, 0); rqd->ppa_status = (u64)0; - rqd->flags = pblk_set_progr_mode(pblk, WRITE); + rqd->flags = pblk_set_progr_mode(pblk, PBLK_WRITE); return ret; } @@ -303,55 +295,6 @@ static int pblk_calc_secs_to_sync(struct pblk *pblk, unsigned int secs_avail, return secs_to_sync; } -static inline int pblk_valid_meta_ppa(struct pblk *pblk, - struct pblk_line *meta_line, - struct ppa_addr *ppa_list, int nr_ppas) -{ - struct nvm_tgt_dev *dev = pblk->dev; - struct nvm_geo *geo = &dev->geo; - struct pblk_line *data_line; - struct ppa_addr ppa, ppa_opt; - u64 paddr; - int i; - - data_line = &pblk->lines[pblk_dev_ppa_to_line(ppa_list[0])]; - paddr = pblk_lookup_page(pblk, meta_line); - ppa = addr_to_gen_ppa(pblk, paddr, 0); - - if (test_bit(pblk_ppa_to_pos(geo, ppa), data_line->blk_bitmap)) - return 1; - - /* Schedule a metadata I/O that is half the distance from the data I/O - * with regards to the number of LUNs forming the pblk instance. This - * balances LUN conflicts across every I/O. - * - * When the LUN configuration changes (e.g., due to GC), this distance - * can align, which would result on a LUN deadlock. In this case, modify - * the distance to not be optimal, but allow metadata I/Os to succeed. - */ - ppa_opt = addr_to_gen_ppa(pblk, paddr + data_line->meta_distance, 0); - if (unlikely(ppa_opt.ppa == ppa.ppa)) { - data_line->meta_distance--; - return 0; - } - - for (i = 0; i < nr_ppas; i += pblk->min_write_pgs) - if (ppa_list[i].g.ch == ppa_opt.g.ch && - ppa_list[i].g.lun == ppa_opt.g.lun) - return 1; - - if (test_bit(pblk_ppa_to_pos(geo, ppa_opt), data_line->blk_bitmap)) { - for (i = 0; i < nr_ppas; i += pblk->min_write_pgs) - if (ppa_list[i].g.ch == ppa.g.ch && - ppa_list[i].g.lun == ppa.g.lun) - return 0; - - return 1; - } - - return 0; -} - int pblk_submit_meta_io(struct pblk *pblk, struct pblk_line *meta_line) { struct nvm_tgt_dev *dev = pblk->dev; @@ -370,11 +313,8 @@ int pblk_submit_meta_io(struct pblk *pblk, struct pblk_line *meta_line) int i, j; int ret; - rqd = pblk_alloc_rqd(pblk, READ); - if (IS_ERR(rqd)) { - pr_err("pblk: cannot allocate write req.\n"); - return PTR_ERR(rqd); - } + rqd = pblk_alloc_rqd(pblk, PBLK_WRITE_INT); + m_ctx = nvm_rq_to_pdu(rqd); m_ctx->private = meta_line; @@ -407,8 +347,6 @@ int pblk_submit_meta_io(struct pblk *pblk, struct pblk_line *meta_line) if (emeta->mem >= lm->emeta_len[0]) { spin_lock(&l_mg->close_lock); list_del(&meta_line->list); - WARN(!bitmap_full(meta_line->map_bitmap, lm->sec_per_line), - "pblk: corrupt meta line %d\n", meta_line->id); spin_unlock(&l_mg->close_lock); } @@ -428,18 +366,51 @@ fail_rollback: pblk_dealloc_page(pblk, meta_line, rq_ppas); list_add(&meta_line->list, &meta_line->list); spin_unlock(&l_mg->close_lock); - - nvm_dev_dma_free(dev->parent, rqd->meta_list, rqd->dma_meta_list); fail_free_bio: - if (likely(l_mg->emeta_alloc_type == PBLK_VMALLOC_META)) - bio_put(bio); + bio_put(bio); fail_free_rqd: - pblk_free_rqd(pblk, rqd, READ); + pblk_free_rqd(pblk, rqd, PBLK_WRITE_INT); return ret; } -static int pblk_sched_meta_io(struct pblk *pblk, struct ppa_addr *prev_list, - int prev_n) +static inline bool pblk_valid_meta_ppa(struct pblk *pblk, + struct pblk_line *meta_line, + struct nvm_rq *data_rqd) +{ + struct nvm_tgt_dev *dev = pblk->dev; + struct nvm_geo *geo = &dev->geo; + struct pblk_c_ctx *data_c_ctx = nvm_rq_to_pdu(data_rqd); + struct pblk_line *data_line = pblk_line_get_data(pblk); + struct ppa_addr ppa, ppa_opt; + u64 paddr; + int pos_opt; + + /* Schedule a metadata I/O that is half the distance from the data I/O + * with regards to the number of LUNs forming the pblk instance. This + * balances LUN conflicts across every I/O. + * + * When the LUN configuration changes (e.g., due to GC), this distance + * can align, which would result on metadata and data I/Os colliding. In + * this case, modify the distance to not be optimal, but move the + * optimal in the right direction. + */ + paddr = pblk_lookup_page(pblk, meta_line); + ppa = addr_to_gen_ppa(pblk, paddr, 0); + ppa_opt = addr_to_gen_ppa(pblk, paddr + data_line->meta_distance, 0); + pos_opt = pblk_ppa_to_pos(geo, ppa_opt); + + if (test_bit(pos_opt, data_c_ctx->lun_bitmap) || + test_bit(pos_opt, data_line->blk_bitmap)) + return true; + + if (unlikely(pblk_ppa_comp(ppa_opt, ppa))) + data_line->meta_distance--; + + return false; +} + +static struct pblk_line *pblk_should_submit_meta_io(struct pblk *pblk, + struct nvm_rq *data_rqd) { struct pblk_line_meta *lm = &pblk->lm; struct pblk_line_mgmt *l_mg = &pblk->l_mg; @@ -449,57 +420,45 @@ static int pblk_sched_meta_io(struct pblk *pblk, struct ppa_addr *prev_list, retry: if (list_empty(&l_mg->emeta_list)) { spin_unlock(&l_mg->close_lock); - return 0; + return NULL; } meta_line = list_first_entry(&l_mg->emeta_list, struct pblk_line, list); - if (bitmap_full(meta_line->map_bitmap, lm->sec_per_line)) + if (meta_line->emeta->mem >= lm->emeta_len[0]) goto retry; spin_unlock(&l_mg->close_lock); - if (!pblk_valid_meta_ppa(pblk, meta_line, prev_list, prev_n)) - return 0; + if (!pblk_valid_meta_ppa(pblk, meta_line, data_rqd)) + return NULL; - return pblk_submit_meta_io(pblk, meta_line); + return meta_line; } static int pblk_submit_io_set(struct pblk *pblk, struct nvm_rq *rqd) { - struct pblk_c_ctx *c_ctx = nvm_rq_to_pdu(rqd); struct ppa_addr erase_ppa; + struct pblk_line *meta_line; int err; ppa_set_empty(&erase_ppa); /* Assign lbas to ppas and populate request structure */ - err = pblk_setup_w_rq(pblk, rqd, c_ctx, &erase_ppa); + err = pblk_setup_w_rq(pblk, rqd, &erase_ppa); if (err) { pr_err("pblk: could not setup write request: %d\n", err); return NVM_IO_ERR; } - if (likely(ppa_empty(erase_ppa))) { - /* Submit metadata write for previous data line */ - err = pblk_sched_meta_io(pblk, rqd->ppa_list, rqd->nr_ppas); - if (err) { - pr_err("pblk: metadata I/O submission failed: %d", err); - return NVM_IO_ERR; - } + meta_line = pblk_should_submit_meta_io(pblk, rqd); - /* Submit data write for current data line */ - err = pblk_submit_io(pblk, rqd); - if (err) { - pr_err("pblk: data I/O submission failed: %d\n", err); - return NVM_IO_ERR; - } - } else { - /* Submit data write for current data line */ - err = pblk_submit_io(pblk, rqd); - if (err) { - pr_err("pblk: data I/O submission failed: %d\n", err); - return NVM_IO_ERR; - } + /* Submit data write for current data line */ + err = pblk_submit_io(pblk, rqd); + if (err) { + pr_err("pblk: data I/O submission failed: %d\n", err); + return NVM_IO_ERR; + } - /* Submit available erase for next data line */ + if (!ppa_empty(erase_ppa)) { + /* Submit erase for next data line */ if (pblk_blk_erase_async(pblk, erase_ppa)) { struct pblk_line *e_line = pblk_line_get_erase(pblk); struct nvm_tgt_dev *dev = pblk->dev; @@ -512,6 +471,15 @@ static int pblk_submit_io_set(struct pblk *pblk, struct nvm_rq *rqd) } } + if (meta_line) { + /* Submit metadata write for previous data line */ + err = pblk_submit_meta_io(pblk, meta_line); + if (err) { + pr_err("pblk: metadata I/O submission failed: %d", err); + return NVM_IO_ERR; + } + } + return NVM_IO_OK; } @@ -521,7 +489,8 @@ static void pblk_free_write_rqd(struct pblk *pblk, struct nvm_rq *rqd) struct bio *bio = rqd->bio; if (c_ctx->nr_padded) - pblk_bio_free_pages(pblk, bio, rqd->nr_ppas, c_ctx->nr_padded); + pblk_bio_free_pages(pblk, bio, c_ctx->nr_valid, + c_ctx->nr_padded); } static int pblk_submit_write(struct pblk *pblk) @@ -543,31 +512,24 @@ static int pblk_submit_write(struct pblk *pblk) if (!secs_to_flush && secs_avail < pblk->min_write_pgs) return 1; - rqd = pblk_alloc_rqd(pblk, WRITE); - if (IS_ERR(rqd)) { - pr_err("pblk: cannot allocate write req.\n"); - return 1; - } - - bio = bio_alloc(GFP_KERNEL, pblk->max_write_pgs); - if (!bio) { - pr_err("pblk: cannot allocate write bio\n"); - goto fail_free_rqd; - } - bio->bi_iter.bi_sector = 0; /* internal bio */ - bio_set_op_attrs(bio, REQ_OP_WRITE, 0); - rqd->bio = bio; - secs_to_sync = pblk_calc_secs_to_sync(pblk, secs_avail, secs_to_flush); if (secs_to_sync > pblk->max_write_pgs) { pr_err("pblk: bad buffer sync calculation\n"); - goto fail_put_bio; + return 1; } secs_to_com = (secs_to_sync > secs_avail) ? secs_avail : secs_to_sync; pos = pblk_rb_read_commit(&pblk->rwb, secs_to_com); - if (pblk_rb_read_to_bio(&pblk->rwb, rqd, bio, pos, secs_to_sync, + bio = bio_alloc(GFP_KERNEL, secs_to_sync); + + bio->bi_iter.bi_sector = 0; /* internal bio */ + bio_set_op_attrs(bio, REQ_OP_WRITE, 0); + + rqd = pblk_alloc_rqd(pblk, PBLK_WRITE); + rqd->bio = bio; + + if (pblk_rb_read_to_bio(&pblk->rwb, rqd, pos, secs_to_sync, secs_avail)) { pr_err("pblk: corrupted write bio\n"); goto fail_put_bio; @@ -586,8 +548,7 @@ fail_free_bio: pblk_free_write_rqd(pblk, rqd); fail_put_bio: bio_put(bio); -fail_free_rqd: - pblk_free_rqd(pblk, rqd, WRITE); + pblk_free_rqd(pblk, rqd, PBLK_WRITE); return 1; } diff --git a/drivers/lightnvm/pblk.h b/drivers/lightnvm/pblk.h index 67e623b..9096103 100644 --- a/drivers/lightnvm/pblk.h +++ b/drivers/lightnvm/pblk.h @@ -40,10 +40,6 @@ #define PBLK_MAX_REQ_ADDRS (64) #define PBLK_MAX_REQ_ADDRS_PW (6) -#define PBLK_WS_POOL_SIZE (128) -#define PBLK_META_POOL_SIZE (128) -#define PBLK_READ_REQ_POOL_SIZE (1024) - #define PBLK_NR_CLOSE_JOBS (4) #define PBLK_CACHE_NAME_LEN (DISK_NAME_LEN + 16) @@ -59,7 +55,15 @@ for ((i) = 0, rlun = &(pblk)->luns[0]; \ (i) < (pblk)->nr_luns; (i)++, rlun = &(pblk)->luns[(i)]) -#define ERASE 2 /* READ = 0, WRITE = 1 */ +/* Static pool sizes */ +#define PBLK_GEN_WS_POOL_SIZE (2) + +enum { + PBLK_READ = READ, + PBLK_WRITE = WRITE,/* Write from write buffer */ + PBLK_WRITE_INT, /* Internal write - no write buffer */ + PBLK_ERASE, +}; enum { /* IO Types */ @@ -95,6 +99,7 @@ enum { }; #define pblk_dma_meta_size (sizeof(struct pblk_sec_meta) * PBLK_MAX_REQ_ADDRS) +#define pblk_dma_ppa_size (sizeof(u64) * PBLK_MAX_REQ_ADDRS) /* write buffer completion context */ struct pblk_c_ctx { @@ -106,9 +111,10 @@ struct pblk_c_ctx { unsigned int nr_padded; }; -/* generic context */ +/* read context */ struct pblk_g_ctx { void *private; + u64 lba; }; /* Pad context */ @@ -207,6 +213,7 @@ struct pblk_lun { struct pblk_gc_rq { struct pblk_line *line; void *data; + u64 paddr_list[PBLK_MAX_REQ_ADDRS]; u64 lba_list[PBLK_MAX_REQ_ADDRS]; int nr_secs; int secs_to_gc; @@ -231,7 +238,10 @@ struct pblk_gc { struct timer_list gc_timer; struct semaphore gc_sem; - atomic_t inflight_gc; + atomic_t read_inflight_gc; /* Number of lines with inflight GC reads */ + atomic_t pipeline_gc; /* Number of lines in the GC pipeline - + * started reads to finished writes + */ int w_entries; struct list_head w_list; @@ -267,6 +277,7 @@ struct pblk_rl { int rb_gc_max; /* Max buffer entries available for GC I/O */ int rb_gc_rsv; /* Reserved buffer entries for GC I/O */ int rb_state; /* Rate-limiter current state */ + int rb_max_io; /* Maximum size for an I/O giving the config */ atomic_t rb_user_cnt; /* User I/O buffer counter */ atomic_t rb_gc_cnt; /* GC I/O buffer counter */ @@ -310,6 +321,7 @@ enum { }; #define PBLK_MAGIC 0x70626c6b /*pblk*/ +#define SMETA_VERSION cpu_to_le16(1) struct line_header { __le32 crc; @@ -618,15 +630,16 @@ struct pblk { struct list_head compl_list; - mempool_t *page_pool; - mempool_t *line_ws_pool; + mempool_t *page_bio_pool; + mempool_t *gen_ws_pool; mempool_t *rec_pool; - mempool_t *g_rq_pool; + mempool_t *r_rq_pool; mempool_t *w_rq_pool; - mempool_t *line_meta_pool; + mempool_t *e_rq_pool; struct workqueue_struct *close_wq; struct workqueue_struct *bb_wq; + struct workqueue_struct *r_end_wq; struct timer_list wtimer; @@ -657,15 +670,15 @@ int pblk_rb_may_write_gc(struct pblk_rb *rb, unsigned int nr_entries, void pblk_rb_write_entry_user(struct pblk_rb *rb, void *data, struct pblk_w_ctx w_ctx, unsigned int pos); void pblk_rb_write_entry_gc(struct pblk_rb *rb, void *data, - struct pblk_w_ctx w_ctx, struct pblk_line *gc_line, - unsigned int pos); + struct pblk_w_ctx w_ctx, struct pblk_line *line, + u64 paddr, unsigned int pos); struct pblk_w_ctx *pblk_rb_w_ctx(struct pblk_rb *rb, unsigned int pos); void pblk_rb_flush(struct pblk_rb *rb); void pblk_rb_sync_l2p(struct pblk_rb *rb); unsigned int pblk_rb_read_to_bio(struct pblk_rb *rb, struct nvm_rq *rqd, - struct bio *bio, unsigned int pos, - unsigned int nr_entries, unsigned int count); + unsigned int pos, unsigned int nr_entries, + unsigned int count); unsigned int pblk_rb_read_to_bio_list(struct pblk_rb *rb, struct bio *bio, struct list_head *list, unsigned int max); @@ -692,24 +705,23 @@ ssize_t pblk_rb_sysfs(struct pblk_rb *rb, char *buf); /* * pblk core */ -struct nvm_rq *pblk_alloc_rqd(struct pblk *pblk, int rw); +struct nvm_rq *pblk_alloc_rqd(struct pblk *pblk, int type); +void pblk_free_rqd(struct pblk *pblk, struct nvm_rq *rqd, int type); void pblk_set_sec_per_write(struct pblk *pblk, int sec_per_write); int pblk_setup_w_rec_rq(struct pblk *pblk, struct nvm_rq *rqd, struct pblk_c_ctx *c_ctx); -void pblk_free_rqd(struct pblk *pblk, struct nvm_rq *rqd, int rw); -void pblk_wait_for_meta(struct pblk *pblk); -struct ppa_addr pblk_get_lba_map(struct pblk *pblk, sector_t lba); void pblk_discard(struct pblk *pblk, struct bio *bio); void pblk_log_write_err(struct pblk *pblk, struct nvm_rq *rqd); void pblk_log_read_err(struct pblk *pblk, struct nvm_rq *rqd); int pblk_submit_io(struct pblk *pblk, struct nvm_rq *rqd); +int pblk_submit_io_sync(struct pblk *pblk, struct nvm_rq *rqd); int pblk_submit_meta_io(struct pblk *pblk, struct pblk_line *meta_line); struct bio *pblk_bio_map_addr(struct pblk *pblk, void *data, unsigned int nr_secs, unsigned int len, int alloc_type, gfp_t gfp_mask); struct pblk_line *pblk_line_get(struct pblk *pblk); struct pblk_line *pblk_line_get_first_data(struct pblk *pblk); -void pblk_line_replace_data(struct pblk *pblk); +struct pblk_line *pblk_line_replace_data(struct pblk *pblk); int pblk_line_recov_alloc(struct pblk *pblk, struct pblk_line *line); void pblk_line_recov_close(struct pblk *pblk, struct pblk_line *line); struct pblk_line *pblk_line_get_data(struct pblk *pblk); @@ -719,19 +731,18 @@ int pblk_line_is_full(struct pblk_line *line); void pblk_line_free(struct pblk *pblk, struct pblk_line *line); void pblk_line_close_meta(struct pblk *pblk, struct pblk_line *line); void pblk_line_close(struct pblk *pblk, struct pblk_line *line); -void pblk_line_close_meta_sync(struct pblk *pblk); void pblk_line_close_ws(struct work_struct *work); void pblk_pipeline_stop(struct pblk *pblk); -void pblk_line_mark_bb(struct work_struct *work); -void pblk_line_run_ws(struct pblk *pblk, struct pblk_line *line, void *priv, - void (*work)(struct work_struct *), - struct workqueue_struct *wq); +void pblk_gen_run_ws(struct pblk *pblk, struct pblk_line *line, void *priv, + void (*work)(struct work_struct *), gfp_t gfp_mask, + struct workqueue_struct *wq); u64 pblk_line_smeta_start(struct pblk *pblk, struct pblk_line *line); int pblk_line_read_smeta(struct pblk *pblk, struct pblk_line *line); int pblk_line_read_emeta(struct pblk *pblk, struct pblk_line *line, void *emeta_buf); int pblk_blk_erase_async(struct pblk *pblk, struct ppa_addr erase_ppa); void pblk_line_put(struct kref *ref); +void pblk_line_put_wq(struct kref *ref); struct list_head *pblk_line_gc_list(struct pblk *pblk, struct pblk_line *line); u64 pblk_lookup_page(struct pblk *pblk, struct pblk_line *line); void pblk_dealloc_page(struct pblk *pblk, struct pblk_line *line, int nr_secs); @@ -745,7 +756,6 @@ void pblk_down_rq(struct pblk *pblk, struct ppa_addr *ppa_list, int nr_ppas, void pblk_down_page(struct pblk *pblk, struct ppa_addr *ppa_list, int nr_ppas); void pblk_up_rq(struct pblk *pblk, struct ppa_addr *ppa_list, int nr_ppas, unsigned long *lun_bitmap); -void pblk_end_bio_sync(struct bio *bio); void pblk_end_io_sync(struct nvm_rq *rqd); int pblk_bio_add_pages(struct pblk *pblk, struct bio *bio, gfp_t flags, int nr_pages); @@ -760,7 +770,7 @@ void pblk_update_map_cache(struct pblk *pblk, sector_t lba, void pblk_update_map_dev(struct pblk *pblk, sector_t lba, struct ppa_addr ppa, struct ppa_addr entry_line); int pblk_update_map_gc(struct pblk *pblk, sector_t lba, struct ppa_addr ppa, - struct pblk_line *gc_line); + struct pblk_line *gc_line, u64 paddr); void pblk_lookup_l2p_rand(struct pblk *pblk, struct ppa_addr *ppas, u64 *lba_list, int nr_secs); void pblk_lookup_l2p_seq(struct pblk *pblk, struct ppa_addr *ppas, @@ -771,9 +781,7 @@ void pblk_lookup_l2p_seq(struct pblk *pblk, struct ppa_addr *ppas, */ int pblk_write_to_cache(struct pblk *pblk, struct bio *bio, unsigned long flags); -int pblk_write_gc_to_cache(struct pblk *pblk, void *data, u64 *lba_list, - unsigned int nr_entries, unsigned int nr_rec_entries, - struct pblk_line *gc_line, unsigned long flags); +int pblk_write_gc_to_cache(struct pblk *pblk, struct pblk_gc_rq *gc_rq); /* * pblk map @@ -797,9 +805,7 @@ void pblk_write_should_kick(struct pblk *pblk); */ extern struct bio_set *pblk_bio_set; int pblk_submit_read(struct pblk *pblk, struct bio *bio); -int pblk_submit_read_gc(struct pblk *pblk, u64 *lba_list, void *data, - unsigned int nr_secs, unsigned int *secs_to_gc, - struct pblk_line *line); +int pblk_submit_read_gc(struct pblk *pblk, struct pblk_gc_rq *gc_rq); /* * pblk recovery */ @@ -815,7 +821,7 @@ int pblk_recov_setup_rq(struct pblk *pblk, struct pblk_c_ctx *c_ctx, * pblk gc */ #define PBLK_GC_MAX_READERS 8 /* Max number of outstanding GC reader jobs */ -#define PBLK_GC_W_QD 128 /* Queue depth for inflight GC write I/Os */ +#define PBLK_GC_RQ_QD 128 /* Queue depth for inflight GC requests */ #define PBLK_GC_L_QD 4 /* Queue depth for inflight GC lines */ #define PBLK_GC_RSV_LINE 1 /* Reserved lines for GC */ @@ -824,7 +830,7 @@ void pblk_gc_exit(struct pblk *pblk); void pblk_gc_should_start(struct pblk *pblk); void pblk_gc_should_stop(struct pblk *pblk); void pblk_gc_should_kick(struct pblk *pblk); -void pblk_gc_kick(struct pblk *pblk); +void pblk_gc_free_full_lines(struct pblk *pblk); void pblk_gc_sysfs_state_show(struct pblk *pblk, int *gc_enabled, int *gc_active); int pblk_gc_sysfs_force(struct pblk *pblk, int force); @@ -834,8 +840,8 @@ int pblk_gc_sysfs_force(struct pblk *pblk, int force); */ void pblk_rl_init(struct pblk_rl *rl, int budget); void pblk_rl_free(struct pblk_rl *rl); +void pblk_rl_update_rates(struct pblk_rl *rl); int pblk_rl_high_thrs(struct pblk_rl *rl); -int pblk_rl_low_thrs(struct pblk_rl *rl); unsigned long pblk_rl_nr_free_blks(struct pblk_rl *rl); int pblk_rl_user_may_insert(struct pblk_rl *rl, int nr_entries); void pblk_rl_inserted(struct pblk_rl *rl, int nr_entries); @@ -843,10 +849,9 @@ void pblk_rl_user_in(struct pblk_rl *rl, int nr_entries); int pblk_rl_gc_may_insert(struct pblk_rl *rl, int nr_entries); void pblk_rl_gc_in(struct pblk_rl *rl, int nr_entries); void pblk_rl_out(struct pblk_rl *rl, int nr_user, int nr_gc); -int pblk_rl_sysfs_rate_show(struct pblk_rl *rl); +int pblk_rl_max_io(struct pblk_rl *rl); void pblk_rl_free_lines_inc(struct pblk_rl *rl, struct pblk_line *line); void pblk_rl_free_lines_dec(struct pblk_rl *rl, struct pblk_line *line); -void pblk_rl_set_space_limit(struct pblk_rl *rl, int entries_left); int pblk_rl_is_limit(struct pblk_rl *rl); /* @@ -892,13 +897,7 @@ static inline void *emeta_to_vsc(struct pblk *pblk, struct line_emeta *emeta) static inline int pblk_line_vsc(struct pblk_line *line) { - int vsc; - - spin_lock(&line->lock); - vsc = le32_to_cpu(*line->vsc); - spin_unlock(&line->lock); - - return vsc; + return le32_to_cpu(*line->vsc); } #define NVM_MEM_PAGE_WRITE (8) @@ -1140,7 +1139,7 @@ static inline int pblk_set_progr_mode(struct pblk *pblk, int type) flags = geo->plane_mode >> 1; - if (type == WRITE) + if (type == PBLK_WRITE) flags |= NVM_IO_SCRAMBLE_ENABLE; return flags; @@ -1200,7 +1199,6 @@ static inline void pblk_print_failed_rqd(struct pblk *pblk, struct nvm_rq *rqd, pr_err("error:%d, ppa_status:%llx\n", error, rqd->ppa_status); } -#endif static inline int pblk_boundary_ppa_checks(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *ppas, int nr_ppas) @@ -1221,14 +1219,50 @@ static inline int pblk_boundary_ppa_checks(struct nvm_tgt_dev *tgt_dev, ppa->g.sec < geo->sec_per_pg) continue; -#ifdef CONFIG_NVM_DEBUG print_ppa(ppa, "boundary", i); -#endif + return 1; } return 0; } +static inline int pblk_check_io(struct pblk *pblk, struct nvm_rq *rqd) +{ + struct nvm_tgt_dev *dev = pblk->dev; + struct ppa_addr *ppa_list; + + ppa_list = (rqd->nr_ppas > 1) ? rqd->ppa_list : &rqd->ppa_addr; + + if (pblk_boundary_ppa_checks(dev, ppa_list, rqd->nr_ppas)) { + WARN_ON(1); + return -EINVAL; + } + + if (rqd->opcode == NVM_OP_PWRITE) { + struct pblk_line *line; + struct ppa_addr ppa; + int i; + + for (i = 0; i < rqd->nr_ppas; i++) { + ppa = ppa_list[i]; + line = &pblk->lines[pblk_dev_ppa_to_line(ppa)]; + + spin_lock(&line->lock); + if (line->state != PBLK_LINESTATE_OPEN) { + pr_err("pblk: bad ppa: line:%d,state:%d\n", + line->id, line->state); + WARN_ON(1); + spin_unlock(&line->lock); + return -EINVAL; + } + spin_unlock(&line->lock); + } + } + + return 0; +} +#endif + static inline int pblk_boundary_paddr_checks(struct pblk *pblk, u64 paddr) { struct pblk_line_meta *lm = &pblk->lm; diff --git a/drivers/md/bcache/alloc.c b/drivers/md/bcache/alloc.c index 0803563..a27d852 100644 --- a/drivers/md/bcache/alloc.c +++ b/drivers/md/bcache/alloc.c @@ -407,7 +407,8 @@ long bch_bucket_alloc(struct cache *ca, unsigned reserve, bool wait) finish_wait(&ca->set->bucket_wait, &w); out: - wake_up_process(ca->alloc_thread); + if (ca->alloc_thread) + wake_up_process(ca->alloc_thread); trace_bcache_alloc(ca, reserve); @@ -442,6 +443,11 @@ out: b->prio = INITIAL_PRIO; } + if (ca->set->avail_nbuckets > 0) { + ca->set->avail_nbuckets--; + bch_update_bucket_in_use(ca->set, &ca->set->gc_stats); + } + return r; } @@ -449,6 +455,11 @@ void __bch_bucket_free(struct cache *ca, struct bucket *b) { SET_GC_MARK(b, 0); SET_GC_SECTORS_USED(b, 0); + + if (ca->set->avail_nbuckets < ca->set->nbuckets) { + ca->set->avail_nbuckets++; + bch_update_bucket_in_use(ca->set, &ca->set->gc_stats); + } } void bch_bucket_free(struct cache_set *c, struct bkey *k) @@ -601,7 +612,7 @@ bool bch_alloc_sectors(struct cache_set *c, struct bkey *k, unsigned sectors, /* * If we had to allocate, we might race and not need to allocate the - * second time we call find_data_bucket(). If we allocated a bucket but + * second time we call pick_data_bucket(). If we allocated a bucket but * didn't use it, drop the refcount bch_bucket_alloc_set() took: */ if (KEY_PTRS(&alloc.key)) diff --git a/drivers/md/bcache/bcache.h b/drivers/md/bcache/bcache.h index abd31e8..843877e 100644 --- a/drivers/md/bcache/bcache.h +++ b/drivers/md/bcache/bcache.h @@ -185,6 +185,7 @@ #include <linux/mutex.h> #include <linux/rbtree.h> #include <linux/rwsem.h> +#include <linux/refcount.h> #include <linux/types.h> #include <linux/workqueue.h> @@ -266,9 +267,6 @@ struct bcache_device { atomic_t *stripe_sectors_dirty; unsigned long *full_dirty_stripes; - unsigned long sectors_dirty_last; - long sectors_dirty_derivative; - struct bio_set *bio_split; unsigned data_csum:1; @@ -300,7 +298,7 @@ struct cached_dev { struct semaphore sb_write_mutex; /* Refcount on the cache set. Always nonzero when we're caching. */ - atomic_t count; + refcount_t count; struct work_struct detach; /* @@ -363,12 +361,14 @@ struct cached_dev { uint64_t writeback_rate_target; int64_t writeback_rate_proportional; - int64_t writeback_rate_derivative; - int64_t writeback_rate_change; + int64_t writeback_rate_integral; + int64_t writeback_rate_integral_scaled; + int32_t writeback_rate_change; unsigned writeback_rate_update_seconds; - unsigned writeback_rate_d_term; + unsigned writeback_rate_i_term_inverse; unsigned writeback_rate_p_term_inverse; + unsigned writeback_rate_minimum; }; enum alloc_reserve { @@ -582,6 +582,7 @@ struct cache_set { uint8_t need_gc; struct gc_stat gc_stats; size_t nbuckets; + size_t avail_nbuckets; struct task_struct *gc_thread; /* Where in the btree gc currently is */ @@ -807,13 +808,13 @@ do { \ static inline void cached_dev_put(struct cached_dev *dc) { - if (atomic_dec_and_test(&dc->count)) + if (refcount_dec_and_test(&dc->count)) schedule_work(&dc->detach); } static inline bool cached_dev_get(struct cached_dev *dc) { - if (!atomic_inc_not_zero(&dc->count)) + if (!refcount_inc_not_zero(&dc->count)) return false; /* Paired with the mb in cached_dev_attach */ diff --git a/drivers/md/bcache/btree.c b/drivers/md/bcache/btree.c index 658c54b..11c5503 100644 --- a/drivers/md/bcache/btree.c +++ b/drivers/md/bcache/btree.c @@ -1241,6 +1241,11 @@ void bch_initial_mark_key(struct cache_set *c, int level, struct bkey *k) __bch_btree_mark_key(c, level, k); } +void bch_update_bucket_in_use(struct cache_set *c, struct gc_stat *stats) +{ + stats->in_use = (c->nbuckets - c->avail_nbuckets) * 100 / c->nbuckets; +} + static bool btree_gc_mark_node(struct btree *b, struct gc_stat *gc) { uint8_t stale = 0; @@ -1652,9 +1657,8 @@ static void btree_gc_start(struct cache_set *c) mutex_unlock(&c->bucket_lock); } -static size_t bch_btree_gc_finish(struct cache_set *c) +static void bch_btree_gc_finish(struct cache_set *c) { - size_t available = 0; struct bucket *b; struct cache *ca; unsigned i; @@ -1691,6 +1695,7 @@ static size_t bch_btree_gc_finish(struct cache_set *c) } rcu_read_unlock(); + c->avail_nbuckets = 0; for_each_cache(ca, c, i) { uint64_t *i; @@ -1712,18 +1717,16 @@ static size_t bch_btree_gc_finish(struct cache_set *c) BUG_ON(!GC_MARK(b) && GC_SECTORS_USED(b)); if (!GC_MARK(b) || GC_MARK(b) == GC_MARK_RECLAIMABLE) - available++; + c->avail_nbuckets++; } } mutex_unlock(&c->bucket_lock); - return available; } static void bch_btree_gc(struct cache_set *c) { int ret; - unsigned long available; struct gc_stat stats; struct closure writes; struct btree_op op; @@ -1746,14 +1749,14 @@ static void bch_btree_gc(struct cache_set *c) pr_warn("gc failed!"); } while (ret); - available = bch_btree_gc_finish(c); + bch_btree_gc_finish(c); wake_up_allocators(c); bch_time_stats_update(&c->btree_gc_time, start_time); stats.key_bytes *= sizeof(uint64_t); stats.data <<= 9; - stats.in_use = (c->nbuckets - available) * 100 / c->nbuckets; + bch_update_bucket_in_use(c, &stats); memcpy(&c->gc_stats, &stats, sizeof(struct gc_stat)); trace_bcache_gc_end(c); diff --git a/drivers/md/bcache/btree.h b/drivers/md/bcache/btree.h index 42204d6..d211e2c 100644 --- a/drivers/md/bcache/btree.h +++ b/drivers/md/bcache/btree.h @@ -306,5 +306,5 @@ void bch_keybuf_del(struct keybuf *, struct keybuf_key *); struct keybuf_key *bch_keybuf_next(struct keybuf *); struct keybuf_key *bch_keybuf_next_rescan(struct cache_set *, struct keybuf *, struct bkey *, keybuf_pred_fn *); - +void bch_update_bucket_in_use(struct cache_set *c, struct gc_stat *stats); #endif diff --git a/drivers/md/bcache/closure.h b/drivers/md/bcache/closure.h index 965907c..ccfbea6 100644 --- a/drivers/md/bcache/closure.h +++ b/drivers/md/bcache/closure.h @@ -252,6 +252,12 @@ static inline void set_closure_fn(struct closure *cl, closure_fn *fn, static inline void closure_queue(struct closure *cl) { struct workqueue_struct *wq = cl->wq; + /** + * Changes made to closure, work_struct, or a couple of other structs + * may cause work.func not pointing to the right location. + */ + BUILD_BUG_ON(offsetof(struct closure, fn) + != offsetof(struct work_struct, func)); if (wq) { INIT_WORK(&cl->work, cl->work.func); BUG_ON(!queue_work(wq, &cl->work)); diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c index 3475d66..3a7aed7 100644 --- a/drivers/md/bcache/request.c +++ b/drivers/md/bcache/request.c @@ -27,12 +27,12 @@ struct kmem_cache *bch_search_cache; static void bch_data_insert_start(struct closure *); -static unsigned cache_mode(struct cached_dev *dc, struct bio *bio) +static unsigned cache_mode(struct cached_dev *dc) { return BDEV_CACHE_MODE(&dc->sb); } -static bool verify(struct cached_dev *dc, struct bio *bio) +static bool verify(struct cached_dev *dc) { return dc->verify; } @@ -370,7 +370,7 @@ static struct hlist_head *iohash(struct cached_dev *dc, uint64_t k) static bool check_should_bypass(struct cached_dev *dc, struct bio *bio) { struct cache_set *c = dc->disk.c; - unsigned mode = cache_mode(dc, bio); + unsigned mode = cache_mode(dc); unsigned sectors, congested = bch_get_congested(c); struct task_struct *task = current; struct io *i; @@ -385,6 +385,14 @@ static bool check_should_bypass(struct cached_dev *dc, struct bio *bio) op_is_write(bio_op(bio)))) goto skip; + /* + * Flag for bypass if the IO is for read-ahead or background, + * unless the read-ahead request is for metadata (eg, for gfs2). + */ + if (bio->bi_opf & (REQ_RAHEAD|REQ_BACKGROUND) && + !(bio->bi_opf & REQ_META)) + goto skip; + if (bio->bi_iter.bi_sector & (c->sb.block_size - 1) || bio_sectors(bio) & (c->sb.block_size - 1)) { pr_debug("skipping unaligned io"); @@ -463,6 +471,7 @@ struct search { unsigned recoverable:1; unsigned write:1; unsigned read_dirty_data:1; + unsigned cache_missed:1; unsigned long start_time; @@ -649,6 +658,7 @@ static inline struct search *search_alloc(struct bio *bio, s->orig_bio = bio; s->cache_miss = NULL; + s->cache_missed = 0; s->d = d; s->recoverable = 1; s->write = op_is_write(bio_op(bio)); @@ -698,8 +708,16 @@ static void cached_dev_read_error(struct closure *cl) { struct search *s = container_of(cl, struct search, cl); struct bio *bio = &s->bio.bio; + struct cached_dev *dc = container_of(s->d, struct cached_dev, disk); - if (s->recoverable) { + /* + * If cache device is dirty (dc->has_dirty is non-zero), then + * recovery a failed read request from cached device may get a + * stale data back. So read failure recovery is only permitted + * when cache device is clean. + */ + if (s->recoverable && + (dc && !atomic_read(&dc->has_dirty))) { /* Retry from the backing device: */ trace_bcache_read_retry(s->orig_bio); @@ -740,7 +758,7 @@ static void cached_dev_read_done(struct closure *cl) s->cache_miss = NULL; } - if (verify(dc, &s->bio.bio) && s->recoverable && !s->read_dirty_data) + if (verify(dc) && s->recoverable && !s->read_dirty_data) bch_data_verify(dc, s->orig_bio); bio_complete(s); @@ -760,12 +778,12 @@ static void cached_dev_read_done_bh(struct closure *cl) struct cached_dev *dc = container_of(s->d, struct cached_dev, disk); bch_mark_cache_accounting(s->iop.c, s->d, - !s->cache_miss, s->iop.bypass); + !s->cache_missed, s->iop.bypass); trace_bcache_read(s->orig_bio, !s->cache_miss, s->iop.bypass); if (s->iop.status) continue_at_nobarrier(cl, cached_dev_read_error, bcache_wq); - else if (s->iop.bio || verify(dc, &s->bio.bio)) + else if (s->iop.bio || verify(dc)) continue_at_nobarrier(cl, cached_dev_read_done, bcache_wq); else continue_at_nobarrier(cl, cached_dev_bio_complete, NULL); @@ -779,6 +797,8 @@ static int cached_dev_cache_miss(struct btree *b, struct search *s, struct cached_dev *dc = container_of(s->d, struct cached_dev, disk); struct bio *miss, *cache_bio; + s->cache_missed = 1; + if (s->cache_miss || s->iop.bypass) { miss = bio_next_split(bio, sectors, GFP_NOIO, s->d->bio_split); ret = miss == bio ? MAP_DONE : MAP_CONTINUE; @@ -892,7 +912,7 @@ static void cached_dev_write(struct cached_dev *dc, struct search *s) s->iop.bypass = true; if (should_writeback(dc, s->orig_bio, - cache_mode(dc, bio), + cache_mode(dc), s->iop.bypass)) { s->iop.bypass = false; s->iop.writeback = true; diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c index fc0a31b..b4d2892 100644 --- a/drivers/md/bcache/super.c +++ b/drivers/md/bcache/super.c @@ -53,12 +53,15 @@ LIST_HEAD(bch_cache_sets); static LIST_HEAD(uncached_devices); static int bcache_major; -static DEFINE_IDA(bcache_minor); +static DEFINE_IDA(bcache_device_idx); static wait_queue_head_t unregister_wait; struct workqueue_struct *bcache_wq; #define BTREE_MAX_PAGES (256 * 1024 / PAGE_SIZE) -#define BCACHE_MINORS 16 /* partition support */ +/* limitation of partitions number on single bcache device */ +#define BCACHE_MINORS 128 +/* limitation of bcache devices number on single system */ +#define BCACHE_DEVICE_IDX_MAX ((1U << MINORBITS)/BCACHE_MINORS) /* Superblock */ @@ -721,6 +724,16 @@ static void bcache_device_attach(struct bcache_device *d, struct cache_set *c, closure_get(&c->caching); } +static inline int first_minor_to_idx(int first_minor) +{ + return (first_minor/BCACHE_MINORS); +} + +static inline int idx_to_first_minor(int idx) +{ + return (idx * BCACHE_MINORS); +} + static void bcache_device_free(struct bcache_device *d) { lockdep_assert_held(&bch_register_lock); @@ -734,7 +747,8 @@ static void bcache_device_free(struct bcache_device *d) if (d->disk && d->disk->queue) blk_cleanup_queue(d->disk->queue); if (d->disk) { - ida_simple_remove(&bcache_minor, d->disk->first_minor); + ida_simple_remove(&bcache_device_idx, + first_minor_to_idx(d->disk->first_minor)); put_disk(d->disk); } @@ -751,7 +765,7 @@ static int bcache_device_init(struct bcache_device *d, unsigned block_size, { struct request_queue *q; size_t n; - int minor; + int idx; if (!d->stripe_size) d->stripe_size = 1 << 31; @@ -776,25 +790,24 @@ static int bcache_device_init(struct bcache_device *d, unsigned block_size, if (!d->full_dirty_stripes) return -ENOMEM; - minor = ida_simple_get(&bcache_minor, 0, MINORMASK + 1, GFP_KERNEL); - if (minor < 0) - return minor; - - minor *= BCACHE_MINORS; + idx = ida_simple_get(&bcache_device_idx, 0, + BCACHE_DEVICE_IDX_MAX, GFP_KERNEL); + if (idx < 0) + return idx; if (!(d->bio_split = bioset_create(4, offsetof(struct bbio, bio), BIOSET_NEED_BVECS | BIOSET_NEED_RESCUER)) || !(d->disk = alloc_disk(BCACHE_MINORS))) { - ida_simple_remove(&bcache_minor, minor); + ida_simple_remove(&bcache_device_idx, idx); return -ENOMEM; } set_capacity(d->disk, sectors); - snprintf(d->disk->disk_name, DISK_NAME_LEN, "bcache%i", minor); + snprintf(d->disk->disk_name, DISK_NAME_LEN, "bcache%i", idx); d->disk->major = bcache_major; - d->disk->first_minor = minor; + d->disk->first_minor = idx_to_first_minor(idx); d->disk->fops = &bcache_ops; d->disk->private_data = d; @@ -889,7 +902,7 @@ static void cached_dev_detach_finish(struct work_struct *w) closure_init_stack(&cl); BUG_ON(!test_bit(BCACHE_DEV_DETACHING, &dc->disk.flags)); - BUG_ON(atomic_read(&dc->count)); + BUG_ON(refcount_read(&dc->count)); mutex_lock(&bch_register_lock); @@ -1016,7 +1029,7 @@ int bch_cached_dev_attach(struct cached_dev *dc, struct cache_set *c) * dc->c must be set before dc->count != 0 - paired with the mb in * cached_dev_get() */ - atomic_set(&dc->count, 1); + refcount_set(&dc->count, 1); /* Block writeback thread, but spawn it */ down_write(&dc->writeback_lock); @@ -1028,7 +1041,7 @@ int bch_cached_dev_attach(struct cached_dev *dc, struct cache_set *c) if (BDEV_STATE(&dc->sb) == BDEV_STATE_DIRTY) { bch_sectors_dirty_init(&dc->disk); atomic_set(&dc->has_dirty, 1); - atomic_inc(&dc->count); + refcount_inc(&dc->count); bch_writeback_queue(dc); } @@ -1129,9 +1142,6 @@ static int cached_dev_init(struct cached_dev *dc, unsigned block_size) if (ret) return ret; - set_capacity(dc->disk.disk, - dc->bdev->bd_part->nr_sects - dc->sb.data_offset); - dc->disk.disk->queue->backing_dev_info->ra_pages = max(dc->disk.disk->queue->backing_dev_info->ra_pages, q->backing_dev_info->ra_pages); @@ -2085,6 +2095,7 @@ static void bcache_exit(void) if (bcache_major) unregister_blkdev(bcache_major, "bcache"); unregister_reboot_notifier(&reboot); + mutex_destroy(&bch_register_lock); } static int __init bcache_init(void) @@ -2103,14 +2114,15 @@ static int __init bcache_init(void) bcache_major = register_blkdev(0, "bcache"); if (bcache_major < 0) { unregister_reboot_notifier(&reboot); + mutex_destroy(&bch_register_lock); return bcache_major; } if (!(bcache_wq = alloc_workqueue("bcache", WQ_MEM_RECLAIM, 0)) || !(bcache_kobj = kobject_create_and_add("bcache", fs_kobj)) || - sysfs_create_files(bcache_kobj, files) || bch_request_init() || - bch_debug_init(bcache_kobj)) + bch_debug_init(bcache_kobj) || + sysfs_create_files(bcache_kobj, files)) goto err; return 0; diff --git a/drivers/md/bcache/sysfs.c b/drivers/md/bcache/sysfs.c index 234b2f5..b418409 100644 --- a/drivers/md/bcache/sysfs.c +++ b/drivers/md/bcache/sysfs.c @@ -82,8 +82,9 @@ rw_attribute(writeback_delay); rw_attribute(writeback_rate); rw_attribute(writeback_rate_update_seconds); -rw_attribute(writeback_rate_d_term); +rw_attribute(writeback_rate_i_term_inverse); rw_attribute(writeback_rate_p_term_inverse); +rw_attribute(writeback_rate_minimum); read_attribute(writeback_rate_debug); read_attribute(stripe_size); @@ -131,15 +132,16 @@ SHOW(__bch_cached_dev) sysfs_hprint(writeback_rate, dc->writeback_rate.rate << 9); var_print(writeback_rate_update_seconds); - var_print(writeback_rate_d_term); + var_print(writeback_rate_i_term_inverse); var_print(writeback_rate_p_term_inverse); + var_print(writeback_rate_minimum); if (attr == &sysfs_writeback_rate_debug) { char rate[20]; char dirty[20]; char target[20]; char proportional[20]; - char derivative[20]; + char integral[20]; char change[20]; s64 next_io; @@ -147,7 +149,7 @@ SHOW(__bch_cached_dev) bch_hprint(dirty, bcache_dev_sectors_dirty(&dc->disk) << 9); bch_hprint(target, dc->writeback_rate_target << 9); bch_hprint(proportional,dc->writeback_rate_proportional << 9); - bch_hprint(derivative, dc->writeback_rate_derivative << 9); + bch_hprint(integral, dc->writeback_rate_integral_scaled << 9); bch_hprint(change, dc->writeback_rate_change << 9); next_io = div64_s64(dc->writeback_rate.next - local_clock(), @@ -158,11 +160,11 @@ SHOW(__bch_cached_dev) "dirty:\t\t%s\n" "target:\t\t%s\n" "proportional:\t%s\n" - "derivative:\t%s\n" + "integral:\t%s\n" "change:\t\t%s/sec\n" "next io:\t%llims\n", rate, dirty, target, proportional, - derivative, change, next_io); + integral, change, next_io); } sysfs_hprint(dirty_data, @@ -214,7 +216,7 @@ STORE(__cached_dev) dc->writeback_rate.rate, 1, INT_MAX); d_strtoul_nonzero(writeback_rate_update_seconds); - d_strtoul(writeback_rate_d_term); + d_strtoul(writeback_rate_i_term_inverse); d_strtoul_nonzero(writeback_rate_p_term_inverse); d_strtoi_h(sequential_cutoff); @@ -320,7 +322,7 @@ static struct attribute *bch_cached_dev_files[] = { &sysfs_writeback_percent, &sysfs_writeback_rate, &sysfs_writeback_rate_update_seconds, - &sysfs_writeback_rate_d_term, + &sysfs_writeback_rate_i_term_inverse, &sysfs_writeback_rate_p_term_inverse, &sysfs_writeback_rate_debug, &sysfs_dirty_data, @@ -746,6 +748,11 @@ static struct attribute *bch_cache_set_internal_files[] = { }; KTYPE(bch_cache_set_internal); +static int __bch_cache_cmp(const void *l, const void *r) +{ + return *((uint16_t *)r) - *((uint16_t *)l); +} + SHOW(__bch_cache) { struct cache *ca = container_of(kobj, struct cache, kobj); @@ -770,9 +777,6 @@ SHOW(__bch_cache) CACHE_REPLACEMENT(&ca->sb)); if (attr == &sysfs_priority_stats) { - int cmp(const void *l, const void *r) - { return *((uint16_t *) r) - *((uint16_t *) l); } - struct bucket *b; size_t n = ca->sb.nbuckets, i; size_t unused = 0, available = 0, dirty = 0, meta = 0; @@ -801,7 +805,7 @@ SHOW(__bch_cache) p[i] = ca->buckets[i].prio; mutex_unlock(&ca->set->bucket_lock); - sort(p, n, sizeof(uint16_t), cmp, NULL); + sort(p, n, sizeof(uint16_t), __bch_cache_cmp, NULL); while (n && !cached[n - 1]) diff --git a/drivers/md/bcache/util.c b/drivers/md/bcache/util.c index 176d3c2..e548b8b 100644 --- a/drivers/md/bcache/util.c +++ b/drivers/md/bcache/util.c @@ -232,8 +232,14 @@ uint64_t bch_next_delay(struct bch_ratelimit *d, uint64_t done) d->next += div_u64(done * NSEC_PER_SEC, d->rate); - if (time_before64(now + NSEC_PER_SEC, d->next)) - d->next = now + NSEC_PER_SEC; + /* Bound the time. Don't let us fall further than 2 seconds behind + * (this prevents unnecessary backlog that would make it impossible + * to catch up). If we're ahead of the desired writeback rate, + * don't let us sleep more than 2.5 seconds (so we can notice/respond + * if the control system tells us to speed up!). + */ + if (time_before64(now + NSEC_PER_SEC * 5LLU / 2LLU, d->next)) + d->next = now + NSEC_PER_SEC * 5LLU / 2LLU; if (time_after64(now - NSEC_PER_SEC * 2, d->next)) d->next = now - NSEC_PER_SEC * 2; diff --git a/drivers/md/bcache/util.h b/drivers/md/bcache/util.h index f54b582..ed5e8a4 100644 --- a/drivers/md/bcache/util.h +++ b/drivers/md/bcache/util.h @@ -442,10 +442,10 @@ struct bch_ratelimit { uint64_t next; /* - * Rate at which we want to do work, in units per nanosecond + * Rate at which we want to do work, in units per second * The units here correspond to the units passed to bch_next_delay() */ - unsigned rate; + uint32_t rate; }; static inline void bch_ratelimit_reset(struct bch_ratelimit *d) diff --git a/drivers/md/bcache/writeback.c b/drivers/md/bcache/writeback.c index 70454f2..56a3788 100644 --- a/drivers/md/bcache/writeback.c +++ b/drivers/md/bcache/writeback.c @@ -26,48 +26,63 @@ static void __update_writeback_rate(struct cached_dev *dc) bcache_flash_devs_sectors_dirty(c); uint64_t cache_dirty_target = div_u64(cache_sectors * dc->writeback_percent, 100); - int64_t target = div64_u64(cache_dirty_target * bdev_sectors(dc->bdev), c->cached_dev_sectors); - /* PD controller */ - + /* + * PI controller: + * Figures out the amount that should be written per second. + * + * First, the error (number of sectors that are dirty beyond our + * target) is calculated. The error is accumulated (numerically + * integrated). + * + * Then, the proportional value and integral value are scaled + * based on configured values. These are stored as inverses to + * avoid fixed point math and to make configuration easy-- e.g. + * the default value of 40 for writeback_rate_p_term_inverse + * attempts to write at a rate that would retire all the dirty + * blocks in 40 seconds. + * + * The writeback_rate_i_inverse value of 10000 means that 1/10000th + * of the error is accumulated in the integral term per second. + * This acts as a slow, long-term average that is not subject to + * variations in usage like the p term. + */ int64_t dirty = bcache_dev_sectors_dirty(&dc->disk); - int64_t derivative = dirty - dc->disk.sectors_dirty_last; - int64_t proportional = dirty - target; - int64_t change; - - dc->disk.sectors_dirty_last = dirty; - - /* Scale to sectors per second */ - - proportional *= dc->writeback_rate_update_seconds; - proportional = div_s64(proportional, dc->writeback_rate_p_term_inverse); - - derivative = div_s64(derivative, dc->writeback_rate_update_seconds); - - derivative = ewma_add(dc->disk.sectors_dirty_derivative, derivative, - (dc->writeback_rate_d_term / - dc->writeback_rate_update_seconds) ?: 1, 0); - - derivative *= dc->writeback_rate_d_term; - derivative = div_s64(derivative, dc->writeback_rate_p_term_inverse); - - change = proportional + derivative; + int64_t error = dirty - target; + int64_t proportional_scaled = + div_s64(error, dc->writeback_rate_p_term_inverse); + int64_t integral_scaled; + uint32_t new_rate; + + if ((error < 0 && dc->writeback_rate_integral > 0) || + (error > 0 && time_before64(local_clock(), + dc->writeback_rate.next + NSEC_PER_MSEC))) { + /* + * Only decrease the integral term if it's more than + * zero. Only increase the integral term if the device + * is keeping up. (Don't wind up the integral + * ineffectively in either case). + * + * It's necessary to scale this by + * writeback_rate_update_seconds to keep the integral + * term dimensioned properly. + */ + dc->writeback_rate_integral += error * + dc->writeback_rate_update_seconds; + } - /* Don't increase writeback rate if the device isn't keeping up */ - if (change > 0 && - time_after64(local_clock(), - dc->writeback_rate.next + NSEC_PER_MSEC)) - change = 0; + integral_scaled = div_s64(dc->writeback_rate_integral, + dc->writeback_rate_i_term_inverse); - dc->writeback_rate.rate = - clamp_t(int64_t, (int64_t) dc->writeback_rate.rate + change, - 1, NSEC_PER_MSEC); + new_rate = clamp_t(int32_t, (proportional_scaled + integral_scaled), + dc->writeback_rate_minimum, NSEC_PER_SEC); - dc->writeback_rate_proportional = proportional; - dc->writeback_rate_derivative = derivative; - dc->writeback_rate_change = change; + dc->writeback_rate_proportional = proportional_scaled; + dc->writeback_rate_integral_scaled = integral_scaled; + dc->writeback_rate_change = new_rate - dc->writeback_rate.rate; + dc->writeback_rate.rate = new_rate; dc->writeback_rate_target = target; } @@ -180,13 +195,21 @@ static void write_dirty(struct closure *cl) struct dirty_io *io = container_of(cl, struct dirty_io, cl); struct keybuf_key *w = io->bio.bi_private; - dirty_init(w); - bio_set_op_attrs(&io->bio, REQ_OP_WRITE, 0); - io->bio.bi_iter.bi_sector = KEY_START(&w->key); - bio_set_dev(&io->bio, io->dc->bdev); - io->bio.bi_end_io = dirty_endio; + /* + * IO errors are signalled using the dirty bit on the key. + * If we failed to read, we should not attempt to write to the + * backing device. Instead, immediately go to write_dirty_finish + * to clean up. + */ + if (KEY_DIRTY(&w->key)) { + dirty_init(w); + bio_set_op_attrs(&io->bio, REQ_OP_WRITE, 0); + io->bio.bi_iter.bi_sector = KEY_START(&w->key); + bio_set_dev(&io->bio, io->dc->bdev); + io->bio.bi_end_io = dirty_endio; - closure_bio_submit(&io->bio, cl); + closure_bio_submit(&io->bio, cl); + } continue_at(cl, write_dirty_finish, io->dc->writeback_write_wq); } @@ -418,6 +441,8 @@ static int bch_writeback_thread(void *arg) struct cached_dev *dc = arg; bool searched_full_index; + bch_ratelimit_reset(&dc->writeback_rate); + while (!kthread_should_stop()) { down_write(&dc->writeback_lock); if (!atomic_read(&dc->has_dirty) || @@ -445,7 +470,6 @@ static int bch_writeback_thread(void *arg) up_write(&dc->writeback_lock); - bch_ratelimit_reset(&dc->writeback_rate); read_dirty(dc); if (searched_full_index) { @@ -455,6 +479,8 @@ static int bch_writeback_thread(void *arg) !kthread_should_stop() && !test_bit(BCACHE_DEV_DETACHING, &dc->disk.flags)) delay = schedule_timeout_interruptible(delay); + + bch_ratelimit_reset(&dc->writeback_rate); } } @@ -492,8 +518,6 @@ void bch_sectors_dirty_init(struct bcache_device *d) bch_btree_map_keys(&op.op, d->c, &KEY(op.inode, 0, 0), sectors_dirty_init_fn, 0); - - d->sectors_dirty_last = bcache_dev_sectors_dirty(d); } void bch_cached_dev_writeback_init(struct cached_dev *dc) @@ -507,10 +531,11 @@ void bch_cached_dev_writeback_init(struct cached_dev *dc) dc->writeback_percent = 10; dc->writeback_delay = 30; dc->writeback_rate.rate = 1024; + dc->writeback_rate_minimum = 8; dc->writeback_rate_update_seconds = 5; - dc->writeback_rate_d_term = 30; - dc->writeback_rate_p_term_inverse = 6000; + dc->writeback_rate_p_term_inverse = 40; + dc->writeback_rate_i_term_inverse = 10000; INIT_DELAYED_WORK(&dc->writeback_rate_update, update_writeback_rate); } diff --git a/drivers/md/bcache/writeback.h b/drivers/md/bcache/writeback.h index 1515447..a9e3ffb 100644 --- a/drivers/md/bcache/writeback.h +++ b/drivers/md/bcache/writeback.h @@ -77,7 +77,9 @@ static inline bool should_writeback(struct cached_dev *dc, struct bio *bio, if (would_skip) return false; - return op_is_sync(bio->bi_opf) || in_use <= CUTOFF_WRITEBACK; + return (op_is_sync(bio->bi_opf) || + bio->bi_opf & (REQ_META|REQ_PRIO) || + in_use <= CUTOFF_WRITEBACK); } static inline void bch_writeback_queue(struct cached_dev *dc) @@ -90,7 +92,7 @@ static inline void bch_writeback_add(struct cached_dev *dc) { if (!atomic_read(&dc->has_dirty) && !atomic_xchg(&dc->has_dirty, 1)) { - atomic_inc(&dc->count); + refcount_inc(&dc->count); if (BDEV_STATE(&dc->sb) != BDEV_STATE_DIRTY) { SET_BDEV_STATE(&dc->sb, BDEV_STATE_DIRTY); diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c index d212163..4d8ed74 100644 --- a/drivers/md/bitmap.c +++ b/drivers/md/bitmap.c @@ -368,7 +368,7 @@ static int read_page(struct file *file, unsigned long index, pr_debug("read bitmap file (%dB @ %llu)\n", (int)PAGE_SIZE, (unsigned long long)index << PAGE_SHIFT); - bh = alloc_page_buffers(page, 1<<inode->i_blkbits, 0); + bh = alloc_page_buffers(page, 1<<inode->i_blkbits, false); if (!bh) { ret = -ENOMEM; goto out; diff --git a/drivers/md/dm-rq.c b/drivers/md/dm-rq.c index eadfcfd..9d32f25 100644 --- a/drivers/md/dm-rq.c +++ b/drivers/md/dm-rq.c @@ -56,7 +56,7 @@ static unsigned dm_get_blk_mq_queue_depth(void) int dm_request_based(struct mapped_device *md) { - return blk_queue_stackable(md->queue); + return queue_is_rq_based(md->queue); } static void dm_old_start_queue(struct request_queue *q) diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index ef7b8f2..7528182 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -1000,7 +1000,7 @@ verify_rq_based: list_for_each_entry(dd, devices, list) { struct request_queue *q = bdev_get_queue(dd->dm_dev->bdev); - if (!blk_queue_stackable(q)) { + if (!queue_is_rq_based(q)) { DMERR("table load rejected: including" " non-request-stackable devices"); return -EINVAL; @@ -1847,19 +1847,6 @@ void dm_table_set_restrictions(struct dm_table *t, struct request_queue *q, */ if (blk_queue_add_random(q) && dm_table_all_devices_attribute(t, device_is_not_random)) queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, q); - - /* - * QUEUE_FLAG_STACKABLE must be set after all queue settings are - * visible to other CPUs because, once the flag is set, incoming bios - * are processed by request-based dm, which refers to the queue - * settings. - * Until the flag set, bios are passed to bio-based dm and queued to - * md->deferred where queue settings are not needed yet. - * Those bios are passed to request-based dm at the resume time. - */ - smp_mb(); - if (dm_table_request_based(t)) - queue_flag_set_unlocked(QUEUE_FLAG_STACKABLE, q); } unsigned int dm_table_get_num_targets(struct dm_table *t) diff --git a/drivers/md/dm.c b/drivers/md/dm.c index 8aaffa1..a3f8cbb 100644 --- a/drivers/md/dm.c +++ b/drivers/md/dm.c @@ -1619,17 +1619,6 @@ static void dm_wq_work(struct work_struct *work); void dm_init_md_queue(struct mapped_device *md) { /* - * Request-based dm devices cannot be stacked on top of bio-based dm - * devices. The type of this dm device may not have been decided yet. - * The type is decided at the first table loading time. - * To prevent problematic device stacking, clear the queue flag - * for request stacking support until then. - * - * This queue is new, so no concurrency on the queue_flags. - */ - queue_flag_clear_unlocked(QUEUE_FLAG_STACKABLE, md->queue); - - /* * Initialize data that will only be used by a non-blk-mq DM queue * - must do so here (in alloc_dev callchain) before queue is used */ diff --git a/drivers/nvme/Kconfig b/drivers/nvme/Kconfig index b7c78a5..04008e0 100644 --- a/drivers/nvme/Kconfig +++ b/drivers/nvme/Kconfig @@ -1,2 +1,6 @@ +menu "NVME Support" + source "drivers/nvme/host/Kconfig" source "drivers/nvme/target/Kconfig" + +endmenu diff --git a/drivers/nvme/host/Kconfig b/drivers/nvme/host/Kconfig index 46d6cb1..b979cf3 100644 --- a/drivers/nvme/host/Kconfig +++ b/drivers/nvme/host/Kconfig @@ -13,6 +13,15 @@ config BLK_DEV_NVME To compile this driver as a module, choose M here: the module will be called nvme. +config NVME_MULTIPATH + bool "NVMe multipath support" + depends on NVME_CORE + ---help--- + This option enables support for multipath access to NVMe + subsystems. If this option is enabled only a single + /dev/nvmeXnY device will show up for each NVMe namespaces, + even if it is accessible through multiple controllers. + config NVME_FABRICS tristate diff --git a/drivers/nvme/host/Makefile b/drivers/nvme/host/Makefile index 7b96e45..a25fd43 100644 --- a/drivers/nvme/host/Makefile +++ b/drivers/nvme/host/Makefile @@ -6,6 +6,7 @@ obj-$(CONFIG_NVME_RDMA) += nvme-rdma.o obj-$(CONFIG_NVME_FC) += nvme-fc.o nvme-core-y := core.o +nvme-core-$(CONFIG_NVME_MULTIPATH) += multipath.o nvme-core-$(CONFIG_NVM) += lightnvm.o nvme-y += pci.o diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 37f9039..25da74d 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -34,13 +34,13 @@ #define NVME_MINORS (1U << MINORBITS) -unsigned char admin_timeout = 60; -module_param(admin_timeout, byte, 0644); +unsigned int admin_timeout = 60; +module_param(admin_timeout, uint, 0644); MODULE_PARM_DESC(admin_timeout, "timeout in seconds for admin commands"); EXPORT_SYMBOL_GPL(admin_timeout); -unsigned char nvme_io_timeout = 30; -module_param_named(io_timeout, nvme_io_timeout, byte, 0644); +unsigned int nvme_io_timeout = 30; +module_param_named(io_timeout, nvme_io_timeout, uint, 0644); MODULE_PARM_DESC(io_timeout, "timeout in seconds for I/O"); EXPORT_SYMBOL_GPL(nvme_io_timeout); @@ -52,9 +52,6 @@ static u8 nvme_max_retries = 5; module_param_named(max_retries, nvme_max_retries, byte, 0644); MODULE_PARM_DESC(max_retries, "max number of retries a command may have"); -static int nvme_char_major; -module_param(nvme_char_major, int, 0); - static unsigned long default_ps_max_latency_us = 100000; module_param(default_ps_max_latency_us, ulong, 0644); MODULE_PARM_DESC(default_ps_max_latency_us, @@ -71,10 +68,17 @@ MODULE_PARM_DESC(streams, "turn on support for Streams write directives"); struct workqueue_struct *nvme_wq; EXPORT_SYMBOL_GPL(nvme_wq); -static LIST_HEAD(nvme_ctrl_list); -static DEFINE_SPINLOCK(dev_list_lock); +static DEFINE_IDA(nvme_subsystems_ida); +static LIST_HEAD(nvme_subsystems); +static DEFINE_MUTEX(nvme_subsystems_lock); +static DEFINE_IDA(nvme_instance_ida); +static dev_t nvme_chr_devt; static struct class *nvme_class; +static struct class *nvme_subsys_class; + +static void nvme_ns_remove(struct nvme_ns *ns); +static int nvme_revalidate_disk(struct gendisk *disk); static __le32 nvme_get_log_dw10(u8 lid, size_t size) { @@ -101,6 +105,51 @@ static int nvme_reset_ctrl_sync(struct nvme_ctrl *ctrl) return ret; } +static void nvme_delete_ctrl_work(struct work_struct *work) +{ + struct nvme_ctrl *ctrl = + container_of(work, struct nvme_ctrl, delete_work); + + flush_work(&ctrl->reset_work); + nvme_stop_ctrl(ctrl); + nvme_remove_namespaces(ctrl); + ctrl->ops->delete_ctrl(ctrl); + nvme_uninit_ctrl(ctrl); + nvme_put_ctrl(ctrl); +} + +int nvme_delete_ctrl(struct nvme_ctrl *ctrl) +{ + if (!nvme_change_ctrl_state(ctrl, NVME_CTRL_DELETING)) + return -EBUSY; + if (!queue_work(nvme_wq, &ctrl->delete_work)) + return -EBUSY; + return 0; +} +EXPORT_SYMBOL_GPL(nvme_delete_ctrl); + +int nvme_delete_ctrl_sync(struct nvme_ctrl *ctrl) +{ + int ret = 0; + + /* + * Keep a reference until the work is flushed since ->delete_ctrl + * can free the controller. + */ + nvme_get_ctrl(ctrl); + ret = nvme_delete_ctrl(ctrl); + if (!ret) + flush_work(&ctrl->delete_work); + nvme_put_ctrl(ctrl); + return ret; +} +EXPORT_SYMBOL_GPL(nvme_delete_ctrl_sync); + +static inline bool nvme_ns_has_pi(struct nvme_ns *ns) +{ + return ns->pi_type && ns->ms == sizeof(struct t10_pi_tuple); +} + static blk_status_t nvme_error_status(struct request *req) { switch (nvme_req(req)->status & 0x7ff) { @@ -142,9 +191,16 @@ static inline bool nvme_req_needs_retry(struct request *req) void nvme_complete_rq(struct request *req) { if (unlikely(nvme_req(req)->status && nvme_req_needs_retry(req))) { - nvme_req(req)->retries++; - blk_mq_requeue_request(req, true); - return; + if (nvme_req_needs_failover(req)) { + nvme_failover_req(req); + return; + } + + if (!blk_queue_dying(req->q)) { + nvme_req(req)->retries++; + blk_mq_requeue_request(req, true); + return; + } } blk_mq_end_request(req, nvme_error_status(req)); @@ -153,18 +209,13 @@ EXPORT_SYMBOL_GPL(nvme_complete_rq); void nvme_cancel_request(struct request *req, void *data, bool reserved) { - int status; - if (!blk_mq_request_started(req)) return; dev_dbg_ratelimited(((struct nvme_ctrl *) data)->device, "Cancelling I/O %d", req->tag); - status = NVME_SC_ABORT_REQ; - if (blk_queue_dying(req->q)) - status |= NVME_SC_DNR; - nvme_req(req)->status = status; + nvme_req(req)->status = NVME_SC_ABORT_REQ; blk_mq_complete_request(req); } @@ -205,6 +256,7 @@ bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl, case NVME_CTRL_RECONNECTING: switch (old_state) { case NVME_CTRL_LIVE: + case NVME_CTRL_RESETTING: changed = true; /* FALLTHRU */ default: @@ -239,11 +291,29 @@ bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl, ctrl->state = new_state; spin_unlock_irqrestore(&ctrl->lock, flags); - + if (changed && ctrl->state == NVME_CTRL_LIVE) + nvme_kick_requeue_lists(ctrl); return changed; } EXPORT_SYMBOL_GPL(nvme_change_ctrl_state); +static void nvme_free_ns_head(struct kref *ref) +{ + struct nvme_ns_head *head = + container_of(ref, struct nvme_ns_head, ref); + + nvme_mpath_remove_disk(head); + ida_simple_remove(&head->subsys->ns_ida, head->instance); + list_del_init(&head->entry); + cleanup_srcu_struct(&head->srcu); + kfree(head); +} + +static void nvme_put_ns_head(struct nvme_ns_head *head) +{ + kref_put(&head->ref, nvme_free_ns_head); +} + static void nvme_free_ns(struct kref *kref) { struct nvme_ns *ns = container_of(kref, struct nvme_ns, kref); @@ -251,14 +321,8 @@ static void nvme_free_ns(struct kref *kref) if (ns->ndev) nvme_nvm_unregister(ns); - if (ns->disk) { - spin_lock(&dev_list_lock); - ns->disk->private_data = NULL; - spin_unlock(&dev_list_lock); - } - put_disk(ns->disk); - ida_simple_remove(&ns->ctrl->ns_ida, ns->instance); + nvme_put_ns_head(ns->head); nvme_put_ctrl(ns->ctrl); kfree(ns); } @@ -268,31 +332,8 @@ static void nvme_put_ns(struct nvme_ns *ns) kref_put(&ns->kref, nvme_free_ns); } -static struct nvme_ns *nvme_get_ns_from_disk(struct gendisk *disk) -{ - struct nvme_ns *ns; - - spin_lock(&dev_list_lock); - ns = disk->private_data; - if (ns) { - if (!kref_get_unless_zero(&ns->kref)) - goto fail; - if (!try_module_get(ns->ctrl->ops->module)) - goto fail_put_ns; - } - spin_unlock(&dev_list_lock); - - return ns; - -fail_put_ns: - kref_put(&ns->kref, nvme_free_ns); -fail: - spin_unlock(&dev_list_lock); - return NULL; -} - struct request *nvme_alloc_request(struct request_queue *q, - struct nvme_command *cmd, unsigned int flags, int qid) + struct nvme_command *cmd, blk_mq_req_flags_t flags, int qid) { unsigned op = nvme_is_write(cmd) ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN; struct request *req; @@ -417,7 +458,7 @@ static inline void nvme_setup_flush(struct nvme_ns *ns, { memset(cmnd, 0, sizeof(*cmnd)); cmnd->common.opcode = nvme_cmd_flush; - cmnd->common.nsid = cpu_to_le32(ns->ns_id); + cmnd->common.nsid = cpu_to_le32(ns->head->ns_id); } static blk_status_t nvme_setup_discard(struct nvme_ns *ns, struct request *req, @@ -448,7 +489,7 @@ static blk_status_t nvme_setup_discard(struct nvme_ns *ns, struct request *req, memset(cmnd, 0, sizeof(*cmnd)); cmnd->dsm.opcode = nvme_cmd_dsm; - cmnd->dsm.nsid = cpu_to_le32(ns->ns_id); + cmnd->dsm.nsid = cpu_to_le32(ns->head->ns_id); cmnd->dsm.nr = cpu_to_le32(segments - 1); cmnd->dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD); @@ -467,16 +508,6 @@ static inline blk_status_t nvme_setup_rw(struct nvme_ns *ns, u16 control = 0; u32 dsmgmt = 0; - /* - * If formated with metadata, require the block layer provide a buffer - * unless this namespace is formated such that the metadata can be - * stripped/generated by the controller with PRACT=1. - */ - if (ns && ns->ms && - (!ns->pi_type || ns->ms != sizeof(struct t10_pi_tuple)) && - !blk_integrity_rq(req) && !blk_rq_is_passthrough(req)) - return BLK_STS_NOTSUPP; - if (req->cmd_flags & REQ_FUA) control |= NVME_RW_FUA; if (req->cmd_flags & (REQ_FAILFAST_DEV | REQ_RAHEAD)) @@ -487,7 +518,7 @@ static inline blk_status_t nvme_setup_rw(struct nvme_ns *ns, memset(cmnd, 0, sizeof(*cmnd)); cmnd->rw.opcode = (rq_data_dir(req) ? nvme_cmd_write : nvme_cmd_read); - cmnd->rw.nsid = cpu_to_le32(ns->ns_id); + cmnd->rw.nsid = cpu_to_le32(ns->head->ns_id); cmnd->rw.slba = cpu_to_le64(nvme_block_nr(ns, blk_rq_pos(req))); cmnd->rw.length = cpu_to_le16((blk_rq_bytes(req) >> ns->lba_shift) - 1); @@ -495,6 +526,18 @@ static inline blk_status_t nvme_setup_rw(struct nvme_ns *ns, nvme_assign_write_stream(ctrl, req, &control, &dsmgmt); if (ns->ms) { + /* + * If formated with metadata, the block layer always provides a + * metadata buffer if CONFIG_BLK_DEV_INTEGRITY is enabled. Else + * we enable the PRACT bit for protection information or set the + * namespace capacity to zero to prevent any I/O. + */ + if (!blk_integrity_rq(req)) { + if (WARN_ON_ONCE(!nvme_ns_has_pi(ns))) + return BLK_STS_NOTSUPP; + control |= NVME_RW_PRINFO_PRACT; + } + switch (ns->pi_type) { case NVME_NS_DPS_PI_TYPE3: control |= NVME_RW_PRINFO_PRCHK_GUARD; @@ -507,8 +550,6 @@ static inline blk_status_t nvme_setup_rw(struct nvme_ns *ns, nvme_block_nr(ns, blk_rq_pos(req))); break; } - if (!blk_integrity_rq(req)) - control |= NVME_RW_PRINFO_PRACT; } cmnd->rw.control = cpu_to_le16(control); @@ -560,7 +601,8 @@ EXPORT_SYMBOL_GPL(nvme_setup_cmd); */ int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd, union nvme_result *result, void *buffer, unsigned bufflen, - unsigned timeout, int qid, int at_head, int flags) + unsigned timeout, int qid, int at_head, + blk_mq_req_flags_t flags) { struct request *req; int ret; @@ -778,7 +820,7 @@ static int nvme_identify_ctrl(struct nvme_ctrl *dev, struct nvme_id_ctrl **id) } static int nvme_identify_ns_descs(struct nvme_ctrl *ctrl, unsigned nsid, - u8 *eui64, u8 *nguid, uuid_t *uuid) + struct nvme_ns_ids *ids) { struct nvme_command c = { }; int status; @@ -814,7 +856,7 @@ static int nvme_identify_ns_descs(struct nvme_ctrl *ctrl, unsigned nsid, goto free_data; } len = NVME_NIDT_EUI64_LEN; - memcpy(eui64, data + pos + sizeof(*cur), len); + memcpy(ids->eui64, data + pos + sizeof(*cur), len); break; case NVME_NIDT_NGUID: if (cur->nidl != NVME_NIDT_NGUID_LEN) { @@ -824,7 +866,7 @@ static int nvme_identify_ns_descs(struct nvme_ctrl *ctrl, unsigned nsid, goto free_data; } len = NVME_NIDT_NGUID_LEN; - memcpy(nguid, data + pos + sizeof(*cur), len); + memcpy(ids->nguid, data + pos + sizeof(*cur), len); break; case NVME_NIDT_UUID: if (cur->nidl != NVME_NIDT_UUID_LEN) { @@ -834,7 +876,7 @@ static int nvme_identify_ns_descs(struct nvme_ctrl *ctrl, unsigned nsid, goto free_data; } len = NVME_NIDT_UUID_LEN; - uuid_copy(uuid, data + pos + sizeof(*cur)); + uuid_copy(&ids->uuid, data + pos + sizeof(*cur)); break; default: /* Skip unnkown types */ @@ -968,7 +1010,7 @@ static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio) memset(&c, 0, sizeof(c)); c.rw.opcode = io.opcode; c.rw.flags = io.flags; - c.rw.nsid = cpu_to_le32(ns->ns_id); + c.rw.nsid = cpu_to_le32(ns->head->ns_id); c.rw.slba = cpu_to_le64(io.slba); c.rw.length = cpu_to_le16(io.nblocks); c.rw.control = cpu_to_le16(io.control); @@ -982,12 +1024,87 @@ static int nvme_submit_io(struct nvme_ns *ns, struct nvme_user_io __user *uio) metadata, meta_len, io.slba, NULL, 0); } +static u32 nvme_known_admin_effects(u8 opcode) +{ + switch (opcode) { + case nvme_admin_format_nvm: + return NVME_CMD_EFFECTS_CSUPP | NVME_CMD_EFFECTS_LBCC | + NVME_CMD_EFFECTS_CSE_MASK; + case nvme_admin_sanitize_nvm: + return NVME_CMD_EFFECTS_CSE_MASK; + default: + break; + } + return 0; +} + +static u32 nvme_passthru_start(struct nvme_ctrl *ctrl, struct nvme_ns *ns, + u8 opcode) +{ + u32 effects = 0; + + if (ns) { + if (ctrl->effects) + effects = le32_to_cpu(ctrl->effects->iocs[opcode]); + if (effects & ~NVME_CMD_EFFECTS_CSUPP) + dev_warn(ctrl->device, + "IO command:%02x has unhandled effects:%08x\n", + opcode, effects); + return 0; + } + + if (ctrl->effects) + effects = le32_to_cpu(ctrl->effects->iocs[opcode]); + else + effects = nvme_known_admin_effects(opcode); + + /* + * For simplicity, IO to all namespaces is quiesced even if the command + * effects say only one namespace is affected. + */ + if (effects & (NVME_CMD_EFFECTS_LBCC | NVME_CMD_EFFECTS_CSE_MASK)) { + nvme_start_freeze(ctrl); + nvme_wait_freeze(ctrl); + } + return effects; +} + +static void nvme_update_formats(struct nvme_ctrl *ctrl) +{ + struct nvme_ns *ns; + + mutex_lock(&ctrl->namespaces_mutex); + list_for_each_entry(ns, &ctrl->namespaces, list) { + if (ns->disk && nvme_revalidate_disk(ns->disk)) + nvme_ns_remove(ns); + } + mutex_unlock(&ctrl->namespaces_mutex); +} + +static void nvme_passthru_end(struct nvme_ctrl *ctrl, u32 effects) +{ + /* + * Revalidate LBA changes prior to unfreezing. This is necessary to + * prevent memory corruption if a logical block size was changed by + * this command. + */ + if (effects & NVME_CMD_EFFECTS_LBCC) + nvme_update_formats(ctrl); + if (effects & (NVME_CMD_EFFECTS_LBCC | NVME_CMD_EFFECTS_CSE_MASK)) + nvme_unfreeze(ctrl); + if (effects & NVME_CMD_EFFECTS_CCC) + nvme_init_identify(ctrl); + if (effects & (NVME_CMD_EFFECTS_NIC | NVME_CMD_EFFECTS_NCC)) + nvme_queue_scan(ctrl); +} + static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns, struct nvme_passthru_cmd __user *ucmd) { struct nvme_passthru_cmd cmd; struct nvme_command c; unsigned timeout = 0; + u32 effects; int status; if (!capable(CAP_SYS_ADMIN)) @@ -1013,10 +1130,13 @@ static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns, if (cmd.timeout_ms) timeout = msecs_to_jiffies(cmd.timeout_ms); + effects = nvme_passthru_start(ctrl, ns, cmd.opcode); status = nvme_submit_user_cmd(ns ? ns->queue : ctrl->admin_q, &c, (void __user *)(uintptr_t)cmd.addr, cmd.data_len, (void __user *)(uintptr_t)cmd.metadata, cmd.metadata, 0, &cmd.result, timeout); + nvme_passthru_end(ctrl, effects); + if (status >= 0) { if (put_user(cmd.result, &ucmd->result)) return -EFAULT; @@ -1025,15 +1145,37 @@ static int nvme_user_cmd(struct nvme_ctrl *ctrl, struct nvme_ns *ns, return status; } -static int nvme_ioctl(struct block_device *bdev, fmode_t mode, - unsigned int cmd, unsigned long arg) +/* + * Issue ioctl requests on the first available path. Note that unlike normal + * block layer requests we will not retry failed request on another controller. + */ +static struct nvme_ns *nvme_get_ns_from_disk(struct gendisk *disk, + struct nvme_ns_head **head, int *srcu_idx) { - struct nvme_ns *ns = bdev->bd_disk->private_data; +#ifdef CONFIG_NVME_MULTIPATH + if (disk->fops == &nvme_ns_head_ops) { + *head = disk->private_data; + *srcu_idx = srcu_read_lock(&(*head)->srcu); + return nvme_find_path(*head); + } +#endif + *head = NULL; + *srcu_idx = -1; + return disk->private_data; +} +static void nvme_put_ns_from_disk(struct nvme_ns_head *head, int idx) +{ + if (head) + srcu_read_unlock(&head->srcu, idx); +} + +static int nvme_ns_ioctl(struct nvme_ns *ns, unsigned cmd, unsigned long arg) +{ switch (cmd) { case NVME_IOCTL_ID: force_successful_syscall_return(); - return ns->ns_id; + return ns->head->ns_id; case NVME_IOCTL_ADMIN_CMD: return nvme_user_cmd(ns->ctrl, NULL, (void __user *)arg); case NVME_IOCTL_IO_CMD: @@ -1052,27 +1194,39 @@ static int nvme_ioctl(struct block_device *bdev, fmode_t mode, } } -#ifdef CONFIG_COMPAT -static int nvme_compat_ioctl(struct block_device *bdev, fmode_t mode, - unsigned int cmd, unsigned long arg) +static int nvme_ioctl(struct block_device *bdev, fmode_t mode, + unsigned int cmd, unsigned long arg) { - return nvme_ioctl(bdev, mode, cmd, arg); + struct nvme_ns_head *head = NULL; + struct nvme_ns *ns; + int srcu_idx, ret; + + ns = nvme_get_ns_from_disk(bdev->bd_disk, &head, &srcu_idx); + if (unlikely(!ns)) + ret = -EWOULDBLOCK; + else + ret = nvme_ns_ioctl(ns, cmd, arg); + nvme_put_ns_from_disk(head, srcu_idx); + return ret; } -#else -#define nvme_compat_ioctl NULL -#endif static int nvme_open(struct block_device *bdev, fmode_t mode) { - return nvme_get_ns_from_disk(bdev->bd_disk) ? 0 : -ENXIO; + struct nvme_ns *ns = bdev->bd_disk->private_data; + +#ifdef CONFIG_NVME_MULTIPATH + /* should never be called due to GENHD_FL_HIDDEN */ + if (WARN_ON_ONCE(ns->head->disk)) + return -ENXIO; +#endif + if (!kref_get_unless_zero(&ns->kref)) + return -ENXIO; + return 0; } static void nvme_release(struct gendisk *disk, fmode_t mode) { - struct nvme_ns *ns = disk->private_data; - - module_put(ns->ctrl->ops->module); - nvme_put_ns(ns); + nvme_put_ns(disk->private_data); } static int nvme_getgeo(struct block_device *bdev, struct hd_geometry *geo) @@ -1085,35 +1239,12 @@ static int nvme_getgeo(struct block_device *bdev, struct hd_geometry *geo) } #ifdef CONFIG_BLK_DEV_INTEGRITY -static void nvme_prep_integrity(struct gendisk *disk, struct nvme_id_ns *id, - u16 bs) -{ - struct nvme_ns *ns = disk->private_data; - u16 old_ms = ns->ms; - u8 pi_type = 0; - - ns->ms = le16_to_cpu(id->lbaf[id->flbas & NVME_NS_FLBAS_LBA_MASK].ms); - ns->ext = ns->ms && (id->flbas & NVME_NS_FLBAS_META_EXT); - - /* PI implementation requires metadata equal t10 pi tuple size */ - if (ns->ms == sizeof(struct t10_pi_tuple)) - pi_type = id->dps & NVME_NS_DPS_PI_MASK; - - if (blk_get_integrity(disk) && - (ns->pi_type != pi_type || ns->ms != old_ms || - bs != queue_logical_block_size(disk->queue) || - (ns->ms && ns->ext))) - blk_integrity_unregister(disk); - - ns->pi_type = pi_type; -} - -static void nvme_init_integrity(struct nvme_ns *ns) +static void nvme_init_integrity(struct gendisk *disk, u16 ms, u8 pi_type) { struct blk_integrity integrity; memset(&integrity, 0, sizeof(integrity)); - switch (ns->pi_type) { + switch (pi_type) { case NVME_NS_DPS_PI_TYPE3: integrity.profile = &t10_pi_type3_crc; integrity.tag_size = sizeof(u16) + sizeof(u32); @@ -1129,16 +1260,12 @@ static void nvme_init_integrity(struct nvme_ns *ns) integrity.profile = NULL; break; } - integrity.tuple_size = ns->ms; - blk_integrity_register(ns->disk, &integrity); - blk_queue_max_integrity_segments(ns->queue, 1); + integrity.tuple_size = ms; + blk_integrity_register(disk, &integrity); + blk_queue_max_integrity_segments(disk->queue, 1); } #else -static void nvme_prep_integrity(struct gendisk *disk, struct nvme_id_ns *id, - u16 bs) -{ -} -static void nvme_init_integrity(struct nvme_ns *ns) +static void nvme_init_integrity(struct gendisk *disk, u16 ms, u8 pi_type) { } #endif /* CONFIG_BLK_DEV_INTEGRITY */ @@ -1149,53 +1276,89 @@ static void nvme_set_chunk_size(struct nvme_ns *ns) blk_queue_chunk_sectors(ns->queue, rounddown_pow_of_two(chunk_size)); } -static void nvme_config_discard(struct nvme_ns *ns) +static void nvme_config_discard(struct nvme_ctrl *ctrl, + unsigned stream_alignment, struct request_queue *queue) { - struct nvme_ctrl *ctrl = ns->ctrl; - u32 logical_block_size = queue_logical_block_size(ns->queue); + u32 size = queue_logical_block_size(queue); + + if (stream_alignment) + size *= stream_alignment; BUILD_BUG_ON(PAGE_SIZE / sizeof(struct nvme_dsm_range) < NVME_DSM_MAX_RANGES); - if (ctrl->nr_streams && ns->sws && ns->sgs) { - unsigned int sz = logical_block_size * ns->sws * ns->sgs; + queue->limits.discard_alignment = size; + queue->limits.discard_granularity = size; - ns->queue->limits.discard_alignment = sz; - ns->queue->limits.discard_granularity = sz; - } else { - ns->queue->limits.discard_alignment = logical_block_size; - ns->queue->limits.discard_granularity = logical_block_size; - } - blk_queue_max_discard_sectors(ns->queue, UINT_MAX); - blk_queue_max_discard_segments(ns->queue, NVME_DSM_MAX_RANGES); - queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, ns->queue); + blk_queue_max_discard_sectors(queue, UINT_MAX); + blk_queue_max_discard_segments(queue, NVME_DSM_MAX_RANGES); + queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, queue); if (ctrl->quirks & NVME_QUIRK_DEALLOCATE_ZEROES) - blk_queue_max_write_zeroes_sectors(ns->queue, UINT_MAX); + blk_queue_max_write_zeroes_sectors(queue, UINT_MAX); } static void nvme_report_ns_ids(struct nvme_ctrl *ctrl, unsigned int nsid, - struct nvme_id_ns *id, u8 *eui64, u8 *nguid, uuid_t *uuid) + struct nvme_id_ns *id, struct nvme_ns_ids *ids) { + memset(ids, 0, sizeof(*ids)); + if (ctrl->vs >= NVME_VS(1, 1, 0)) - memcpy(eui64, id->eui64, sizeof(id->eui64)); + memcpy(ids->eui64, id->eui64, sizeof(id->eui64)); if (ctrl->vs >= NVME_VS(1, 2, 0)) - memcpy(nguid, id->nguid, sizeof(id->nguid)); + memcpy(ids->nguid, id->nguid, sizeof(id->nguid)); if (ctrl->vs >= NVME_VS(1, 3, 0)) { /* Don't treat error as fatal we potentially * already have a NGUID or EUI-64 */ - if (nvme_identify_ns_descs(ctrl, nsid, eui64, nguid, uuid)) + if (nvme_identify_ns_descs(ctrl, nsid, ids)) dev_warn(ctrl->device, "%s: Identify Descriptors failed\n", __func__); } } +static bool nvme_ns_ids_valid(struct nvme_ns_ids *ids) +{ + return !uuid_is_null(&ids->uuid) || + memchr_inv(ids->nguid, 0, sizeof(ids->nguid)) || + memchr_inv(ids->eui64, 0, sizeof(ids->eui64)); +} + +static bool nvme_ns_ids_equal(struct nvme_ns_ids *a, struct nvme_ns_ids *b) +{ + return uuid_equal(&a->uuid, &b->uuid) && + memcmp(&a->nguid, &b->nguid, sizeof(a->nguid)) == 0 && + memcmp(&a->eui64, &b->eui64, sizeof(a->eui64)) == 0; +} + +static void nvme_update_disk_info(struct gendisk *disk, + struct nvme_ns *ns, struct nvme_id_ns *id) +{ + sector_t capacity = le64_to_cpup(&id->nsze) << (ns->lba_shift - 9); + unsigned stream_alignment = 0; + + if (ns->ctrl->nr_streams && ns->sws && ns->sgs) + stream_alignment = ns->sws * ns->sgs; + + blk_mq_freeze_queue(disk->queue); + blk_integrity_unregister(disk); + + blk_queue_logical_block_size(disk->queue, 1 << ns->lba_shift); + if (ns->ms && !ns->ext && + (ns->ctrl->ops->flags & NVME_F_METADATA_SUPPORTED)) + nvme_init_integrity(disk, ns->ms, ns->pi_type); + if (ns->ms && !nvme_ns_has_pi(ns) && !blk_get_integrity(disk)) + capacity = 0; + set_capacity(disk, capacity); + + if (ns->ctrl->oncs & NVME_CTRL_ONCS_DSM) + nvme_config_discard(ns->ctrl, stream_alignment, disk->queue); + blk_mq_unfreeze_queue(disk->queue); +} + static void __nvme_revalidate_disk(struct gendisk *disk, struct nvme_id_ns *id) { struct nvme_ns *ns = disk->private_data; - struct nvme_ctrl *ctrl = ns->ctrl; - u16 bs; /* * If identify namespace failed, use default 512 byte block size so @@ -1204,26 +1367,22 @@ static void __nvme_revalidate_disk(struct gendisk *disk, struct nvme_id_ns *id) ns->lba_shift = id->lbaf[id->flbas & NVME_NS_FLBAS_LBA_MASK].ds; if (ns->lba_shift == 0) ns->lba_shift = 9; - bs = 1 << ns->lba_shift; ns->noiob = le16_to_cpu(id->noiob); + ns->ext = ns->ms && (id->flbas & NVME_NS_FLBAS_META_EXT); + ns->ms = le16_to_cpu(id->lbaf[id->flbas & NVME_NS_FLBAS_LBA_MASK].ms); + /* the PI implementation requires metadata equal t10 pi tuple size */ + if (ns->ms == sizeof(struct t10_pi_tuple)) + ns->pi_type = id->dps & NVME_NS_DPS_PI_MASK; + else + ns->pi_type = 0; - blk_mq_freeze_queue(disk->queue); - - if (ctrl->ops->flags & NVME_F_METADATA_SUPPORTED) - nvme_prep_integrity(disk, id, bs); - blk_queue_logical_block_size(ns->queue, bs); if (ns->noiob) nvme_set_chunk_size(ns); - if (ns->ms && !blk_get_integrity(disk) && !ns->ext) - nvme_init_integrity(ns); - if (ns->ms && !(ns->ms == 8 && ns->pi_type) && !blk_get_integrity(disk)) - set_capacity(disk, 0); - else - set_capacity(disk, le64_to_cpup(&id->nsze) << (ns->lba_shift - 9)); - - if (ctrl->oncs & NVME_CTRL_ONCS_DSM) - nvme_config_discard(ns); - blk_mq_unfreeze_queue(disk->queue); + nvme_update_disk_info(disk, ns, id); +#ifdef CONFIG_NVME_MULTIPATH + if (ns->head->disk) + nvme_update_disk_info(ns->head->disk, ns, id); +#endif } static int nvme_revalidate_disk(struct gendisk *disk) @@ -1231,8 +1390,7 @@ static int nvme_revalidate_disk(struct gendisk *disk) struct nvme_ns *ns = disk->private_data; struct nvme_ctrl *ctrl = ns->ctrl; struct nvme_id_ns *id; - u8 eui64[8] = { 0 }, nguid[16] = { 0 }; - uuid_t uuid = uuid_null; + struct nvme_ns_ids ids; int ret = 0; if (test_bit(NVME_NS_DEAD, &ns->flags)) { @@ -1240,7 +1398,7 @@ static int nvme_revalidate_disk(struct gendisk *disk) return -ENODEV; } - id = nvme_identify_ns(ctrl, ns->ns_id); + id = nvme_identify_ns(ctrl, ns->head->ns_id); if (!id) return -ENODEV; @@ -1250,12 +1408,10 @@ static int nvme_revalidate_disk(struct gendisk *disk) } __nvme_revalidate_disk(disk, id); - nvme_report_ns_ids(ctrl, ns->ns_id, id, eui64, nguid, &uuid); - if (!uuid_equal(&ns->uuid, &uuid) || - memcmp(&ns->nguid, &nguid, sizeof(ns->nguid)) || - memcmp(&ns->eui, &eui64, sizeof(ns->eui))) { + nvme_report_ns_ids(ctrl, ns->head->ns_id, id, &ids); + if (!nvme_ns_ids_equal(&ns->head->ids, &ids)) { dev_err(ctrl->device, - "identifiers changed for nsid %d\n", ns->ns_id); + "identifiers changed for nsid %d\n", ns->head->ns_id); ret = -ENODEV; } @@ -1287,8 +1443,10 @@ static char nvme_pr_type(enum pr_type type) static int nvme_pr_command(struct block_device *bdev, u32 cdw10, u64 key, u64 sa_key, u8 op) { - struct nvme_ns *ns = bdev->bd_disk->private_data; + struct nvme_ns_head *head = NULL; + struct nvme_ns *ns; struct nvme_command c; + int srcu_idx, ret; u8 data[16] = { 0, }; put_unaligned_le64(key, &data[0]); @@ -1296,10 +1454,16 @@ static int nvme_pr_command(struct block_device *bdev, u32 cdw10, memset(&c, 0, sizeof(c)); c.common.opcode = op; - c.common.nsid = cpu_to_le32(ns->ns_id); + c.common.nsid = cpu_to_le32(head->ns_id); c.common.cdw10[0] = cpu_to_le32(cdw10); - return nvme_submit_sync_cmd(ns->queue, &c, data, 16); + ns = nvme_get_ns_from_disk(bdev->bd_disk, &head, &srcu_idx); + if (unlikely(!ns)) + ret = -EWOULDBLOCK; + else + ret = nvme_submit_sync_cmd(ns->queue, &c, data, 16); + nvme_put_ns_from_disk(head, srcu_idx); + return ret; } static int nvme_pr_register(struct block_device *bdev, u64 old, @@ -1381,7 +1545,7 @@ EXPORT_SYMBOL_GPL(nvme_sec_submit); static const struct block_device_operations nvme_fops = { .owner = THIS_MODULE, .ioctl = nvme_ioctl, - .compat_ioctl = nvme_compat_ioctl, + .compat_ioctl = nvme_ioctl, .open = nvme_open, .release = nvme_release, .getgeo = nvme_getgeo, @@ -1389,6 +1553,32 @@ static const struct block_device_operations nvme_fops = { .pr_ops = &nvme_pr_ops, }; +#ifdef CONFIG_NVME_MULTIPATH +static int nvme_ns_head_open(struct block_device *bdev, fmode_t mode) +{ + struct nvme_ns_head *head = bdev->bd_disk->private_data; + + if (!kref_get_unless_zero(&head->ref)) + return -ENXIO; + return 0; +} + +static void nvme_ns_head_release(struct gendisk *disk, fmode_t mode) +{ + nvme_put_ns_head(disk->private_data); +} + +const struct block_device_operations nvme_ns_head_ops = { + .owner = THIS_MODULE, + .open = nvme_ns_head_open, + .release = nvme_ns_head_release, + .ioctl = nvme_ioctl, + .compat_ioctl = nvme_ioctl, + .getgeo = nvme_getgeo, + .pr_ops = &nvme_pr_ops, +}; +#endif /* CONFIG_NVME_MULTIPATH */ + static int nvme_wait_ready(struct nvme_ctrl *ctrl, u64 cap, bool enabled) { unsigned long timeout = @@ -1737,14 +1927,15 @@ static bool quirk_matches(const struct nvme_id_ctrl *id, string_matches(id->fr, q->fr, sizeof(id->fr)); } -static void nvme_init_subnqn(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id) +static void nvme_init_subnqn(struct nvme_subsystem *subsys, struct nvme_ctrl *ctrl, + struct nvme_id_ctrl *id) { size_t nqnlen; int off; nqnlen = strnlen(id->subnqn, NVMF_NQN_SIZE); if (nqnlen > 0 && nqnlen < NVMF_NQN_SIZE) { - strcpy(ctrl->subnqn, id->subnqn); + strncpy(subsys->subnqn, id->subnqn, NVMF_NQN_SIZE); return; } @@ -1752,14 +1943,222 @@ static void nvme_init_subnqn(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id) dev_warn(ctrl->device, "missing or invalid SUBNQN field.\n"); /* Generate a "fake" NQN per Figure 254 in NVMe 1.3 + ECN 001 */ - off = snprintf(ctrl->subnqn, NVMF_NQN_SIZE, + off = snprintf(subsys->subnqn, NVMF_NQN_SIZE, "nqn.2014.08.org.nvmexpress:%4x%4x", le16_to_cpu(id->vid), le16_to_cpu(id->ssvid)); - memcpy(ctrl->subnqn + off, id->sn, sizeof(id->sn)); + memcpy(subsys->subnqn + off, id->sn, sizeof(id->sn)); off += sizeof(id->sn); - memcpy(ctrl->subnqn + off, id->mn, sizeof(id->mn)); + memcpy(subsys->subnqn + off, id->mn, sizeof(id->mn)); off += sizeof(id->mn); - memset(ctrl->subnqn + off, 0, sizeof(ctrl->subnqn) - off); + memset(subsys->subnqn + off, 0, sizeof(subsys->subnqn) - off); +} + +static void __nvme_release_subsystem(struct nvme_subsystem *subsys) +{ + ida_simple_remove(&nvme_subsystems_ida, subsys->instance); + kfree(subsys); +} + +static void nvme_release_subsystem(struct device *dev) +{ + __nvme_release_subsystem(container_of(dev, struct nvme_subsystem, dev)); +} + +static void nvme_destroy_subsystem(struct kref *ref) +{ + struct nvme_subsystem *subsys = + container_of(ref, struct nvme_subsystem, ref); + + mutex_lock(&nvme_subsystems_lock); + list_del(&subsys->entry); + mutex_unlock(&nvme_subsystems_lock); + + ida_destroy(&subsys->ns_ida); + device_del(&subsys->dev); + put_device(&subsys->dev); +} + +static void nvme_put_subsystem(struct nvme_subsystem *subsys) +{ + kref_put(&subsys->ref, nvme_destroy_subsystem); +} + +static struct nvme_subsystem *__nvme_find_get_subsystem(const char *subsysnqn) +{ + struct nvme_subsystem *subsys; + + lockdep_assert_held(&nvme_subsystems_lock); + + list_for_each_entry(subsys, &nvme_subsystems, entry) { + if (strcmp(subsys->subnqn, subsysnqn)) + continue; + if (!kref_get_unless_zero(&subsys->ref)) + continue; + return subsys; + } + + return NULL; +} + +#define SUBSYS_ATTR_RO(_name, _mode, _show) \ + struct device_attribute subsys_attr_##_name = \ + __ATTR(_name, _mode, _show, NULL) + +static ssize_t nvme_subsys_show_nqn(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct nvme_subsystem *subsys = + container_of(dev, struct nvme_subsystem, dev); + + return snprintf(buf, PAGE_SIZE, "%s\n", subsys->subnqn); +} +static SUBSYS_ATTR_RO(subsysnqn, S_IRUGO, nvme_subsys_show_nqn); + +#define nvme_subsys_show_str_function(field) \ +static ssize_t subsys_##field##_show(struct device *dev, \ + struct device_attribute *attr, char *buf) \ +{ \ + struct nvme_subsystem *subsys = \ + container_of(dev, struct nvme_subsystem, dev); \ + return sprintf(buf, "%.*s\n", \ + (int)sizeof(subsys->field), subsys->field); \ +} \ +static SUBSYS_ATTR_RO(field, S_IRUGO, subsys_##field##_show); + +nvme_subsys_show_str_function(model); +nvme_subsys_show_str_function(serial); +nvme_subsys_show_str_function(firmware_rev); + +static struct attribute *nvme_subsys_attrs[] = { + &subsys_attr_model.attr, + &subsys_attr_serial.attr, + &subsys_attr_firmware_rev.attr, + &subsys_attr_subsysnqn.attr, + NULL, +}; + +static struct attribute_group nvme_subsys_attrs_group = { + .attrs = nvme_subsys_attrs, +}; + +static const struct attribute_group *nvme_subsys_attrs_groups[] = { + &nvme_subsys_attrs_group, + NULL, +}; + +static int nvme_init_subsystem(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id) +{ + struct nvme_subsystem *subsys, *found; + int ret; + + subsys = kzalloc(sizeof(*subsys), GFP_KERNEL); + if (!subsys) + return -ENOMEM; + ret = ida_simple_get(&nvme_subsystems_ida, 0, 0, GFP_KERNEL); + if (ret < 0) { + kfree(subsys); + return ret; + } + subsys->instance = ret; + mutex_init(&subsys->lock); + kref_init(&subsys->ref); + INIT_LIST_HEAD(&subsys->ctrls); + INIT_LIST_HEAD(&subsys->nsheads); + nvme_init_subnqn(subsys, ctrl, id); + memcpy(subsys->serial, id->sn, sizeof(subsys->serial)); + memcpy(subsys->model, id->mn, sizeof(subsys->model)); + memcpy(subsys->firmware_rev, id->fr, sizeof(subsys->firmware_rev)); + subsys->vendor_id = le16_to_cpu(id->vid); + subsys->cmic = id->cmic; + + subsys->dev.class = nvme_subsys_class; + subsys->dev.release = nvme_release_subsystem; + subsys->dev.groups = nvme_subsys_attrs_groups; + dev_set_name(&subsys->dev, "nvme-subsys%d", subsys->instance); + device_initialize(&subsys->dev); + + mutex_lock(&nvme_subsystems_lock); + found = __nvme_find_get_subsystem(subsys->subnqn); + if (found) { + /* + * Verify that the subsystem actually supports multiple + * controllers, else bail out. + */ + if (!(id->cmic & (1 << 1))) { + dev_err(ctrl->device, + "ignoring ctrl due to duplicate subnqn (%s).\n", + found->subnqn); + nvme_put_subsystem(found); + ret = -EINVAL; + goto out_unlock; + } + + __nvme_release_subsystem(subsys); + subsys = found; + } else { + ret = device_add(&subsys->dev); + if (ret) { + dev_err(ctrl->device, + "failed to register subsystem device.\n"); + goto out_unlock; + } + ida_init(&subsys->ns_ida); + list_add_tail(&subsys->entry, &nvme_subsystems); + } + + ctrl->subsys = subsys; + mutex_unlock(&nvme_subsystems_lock); + + if (sysfs_create_link(&subsys->dev.kobj, &ctrl->device->kobj, + dev_name(ctrl->device))) { + dev_err(ctrl->device, + "failed to create sysfs link from subsystem.\n"); + /* the transport driver will eventually put the subsystem */ + return -EINVAL; + } + + mutex_lock(&subsys->lock); + list_add_tail(&ctrl->subsys_entry, &subsys->ctrls); + mutex_unlock(&subsys->lock); + + return 0; + +out_unlock: + mutex_unlock(&nvme_subsystems_lock); + put_device(&subsys->dev); + return ret; +} + +static int nvme_get_log(struct nvme_ctrl *ctrl, u8 log_page, void *log, + size_t size) +{ + struct nvme_command c = { }; + + c.common.opcode = nvme_admin_get_log_page; + c.common.nsid = cpu_to_le32(NVME_NSID_ALL); + c.common.cdw10[0] = nvme_get_log_dw10(log_page, size); + + return nvme_submit_sync_cmd(ctrl->admin_q, &c, log, size); +} + +static int nvme_get_effects_log(struct nvme_ctrl *ctrl) +{ + int ret; + + if (!ctrl->effects) + ctrl->effects = kzalloc(sizeof(*ctrl->effects), GFP_KERNEL); + + if (!ctrl->effects) + return 0; + + ret = nvme_get_log(ctrl, NVME_LOG_CMD_EFFECTS, ctrl->effects, + sizeof(*ctrl->effects)); + if (ret) { + kfree(ctrl->effects); + ctrl->effects = NULL; + } + return ret; } /* @@ -1797,9 +2196,19 @@ int nvme_init_identify(struct nvme_ctrl *ctrl) return -EIO; } - nvme_init_subnqn(ctrl, id); + if (id->lpa & NVME_CTRL_LPA_CMD_EFFECTS_LOG) { + ret = nvme_get_effects_log(ctrl); + if (ret < 0) + return ret; + } if (!ctrl->identified) { + int i; + + ret = nvme_init_subsystem(ctrl, id); + if (ret) + goto out_free; + /* * Check for quirks. Quirk can depend on firmware version, * so, in principle, the set of quirks present can change @@ -1808,9 +2217,6 @@ int nvme_init_identify(struct nvme_ctrl *ctrl) * the device, but we'd have to make sure that the driver * behaves intelligently if the quirks change. */ - - int i; - for (i = 0; i < ARRAY_SIZE(core_quirks); i++) { if (quirk_matches(id, &core_quirks[i])) ctrl->quirks |= core_quirks[i].quirks; @@ -1823,14 +2229,10 @@ int nvme_init_identify(struct nvme_ctrl *ctrl) } ctrl->oacs = le16_to_cpu(id->oacs); - ctrl->vid = le16_to_cpu(id->vid); ctrl->oncs = le16_to_cpup(&id->oncs); atomic_set(&ctrl->abort_limit, id->acl + 1); ctrl->vwc = id->vwc; ctrl->cntlid = le16_to_cpup(&id->cntlid); - memcpy(ctrl->serial, id->sn, sizeof(id->sn)); - memcpy(ctrl->model, id->mn, sizeof(id->mn)); - memcpy(ctrl->firmware_rev, id->fr, sizeof(id->fr)); if (id->mdts) max_hw_sectors = 1 << (id->mdts + page_shift - 9); else @@ -1931,33 +2333,12 @@ EXPORT_SYMBOL_GPL(nvme_init_identify); static int nvme_dev_open(struct inode *inode, struct file *file) { - struct nvme_ctrl *ctrl; - int instance = iminor(inode); - int ret = -ENODEV; - - spin_lock(&dev_list_lock); - list_for_each_entry(ctrl, &nvme_ctrl_list, node) { - if (ctrl->instance != instance) - continue; - - if (!ctrl->admin_q) { - ret = -EWOULDBLOCK; - break; - } - if (!kref_get_unless_zero(&ctrl->kref)) - break; - file->private_data = ctrl; - ret = 0; - break; - } - spin_unlock(&dev_list_lock); - - return ret; -} + struct nvme_ctrl *ctrl = + container_of(inode->i_cdev, struct nvme_ctrl, cdev); -static int nvme_dev_release(struct inode *inode, struct file *file) -{ - nvme_put_ctrl(file->private_data); + if (ctrl->state != NVME_CTRL_LIVE) + return -EWOULDBLOCK; + file->private_data = ctrl; return 0; } @@ -2021,7 +2402,6 @@ static long nvme_dev_ioctl(struct file *file, unsigned int cmd, static const struct file_operations nvme_dev_fops = { .owner = THIS_MODULE, .open = nvme_dev_open, - .release = nvme_dev_release, .unlocked_ioctl = nvme_dev_ioctl, .compat_ioctl = nvme_dev_ioctl, }; @@ -2051,77 +2431,86 @@ static ssize_t nvme_sysfs_rescan(struct device *dev, } static DEVICE_ATTR(rescan_controller, S_IWUSR, NULL, nvme_sysfs_rescan); +static inline struct nvme_ns_head *dev_to_ns_head(struct device *dev) +{ + struct gendisk *disk = dev_to_disk(dev); + + if (disk->fops == &nvme_fops) + return nvme_get_ns_from_dev(dev)->head; + else + return disk->private_data; +} + static ssize_t wwid_show(struct device *dev, struct device_attribute *attr, - char *buf) + char *buf) { - struct nvme_ns *ns = nvme_get_ns_from_dev(dev); - struct nvme_ctrl *ctrl = ns->ctrl; - int serial_len = sizeof(ctrl->serial); - int model_len = sizeof(ctrl->model); + struct nvme_ns_head *head = dev_to_ns_head(dev); + struct nvme_ns_ids *ids = &head->ids; + struct nvme_subsystem *subsys = head->subsys; + int serial_len = sizeof(subsys->serial); + int model_len = sizeof(subsys->model); - if (!uuid_is_null(&ns->uuid)) - return sprintf(buf, "uuid.%pU\n", &ns->uuid); + if (!uuid_is_null(&ids->uuid)) + return sprintf(buf, "uuid.%pU\n", &ids->uuid); - if (memchr_inv(ns->nguid, 0, sizeof(ns->nguid))) - return sprintf(buf, "eui.%16phN\n", ns->nguid); + if (memchr_inv(ids->nguid, 0, sizeof(ids->nguid))) + return sprintf(buf, "eui.%16phN\n", ids->nguid); - if (memchr_inv(ns->eui, 0, sizeof(ns->eui))) - return sprintf(buf, "eui.%8phN\n", ns->eui); + if (memchr_inv(ids->eui64, 0, sizeof(ids->eui64))) + return sprintf(buf, "eui.%8phN\n", ids->eui64); - while (serial_len > 0 && (ctrl->serial[serial_len - 1] == ' ' || - ctrl->serial[serial_len - 1] == '\0')) + while (serial_len > 0 && (subsys->serial[serial_len - 1] == ' ' || + subsys->serial[serial_len - 1] == '\0')) serial_len--; - while (model_len > 0 && (ctrl->model[model_len - 1] == ' ' || - ctrl->model[model_len - 1] == '\0')) + while (model_len > 0 && (subsys->model[model_len - 1] == ' ' || + subsys->model[model_len - 1] == '\0')) model_len--; - return sprintf(buf, "nvme.%04x-%*phN-%*phN-%08x\n", ctrl->vid, - serial_len, ctrl->serial, model_len, ctrl->model, ns->ns_id); + return sprintf(buf, "nvme.%04x-%*phN-%*phN-%08x\n", subsys->vendor_id, + serial_len, subsys->serial, model_len, subsys->model, + head->ns_id); } static DEVICE_ATTR(wwid, S_IRUGO, wwid_show, NULL); static ssize_t nguid_show(struct device *dev, struct device_attribute *attr, - char *buf) + char *buf) { - struct nvme_ns *ns = nvme_get_ns_from_dev(dev); - return sprintf(buf, "%pU\n", ns->nguid); + return sprintf(buf, "%pU\n", dev_to_ns_head(dev)->ids.nguid); } static DEVICE_ATTR(nguid, S_IRUGO, nguid_show, NULL); static ssize_t uuid_show(struct device *dev, struct device_attribute *attr, - char *buf) + char *buf) { - struct nvme_ns *ns = nvme_get_ns_from_dev(dev); + struct nvme_ns_ids *ids = &dev_to_ns_head(dev)->ids; /* For backward compatibility expose the NGUID to userspace if * we have no UUID set */ - if (uuid_is_null(&ns->uuid)) { + if (uuid_is_null(&ids->uuid)) { printk_ratelimited(KERN_WARNING "No UUID available providing old NGUID\n"); - return sprintf(buf, "%pU\n", ns->nguid); + return sprintf(buf, "%pU\n", ids->nguid); } - return sprintf(buf, "%pU\n", &ns->uuid); + return sprintf(buf, "%pU\n", &ids->uuid); } static DEVICE_ATTR(uuid, S_IRUGO, uuid_show, NULL); static ssize_t eui_show(struct device *dev, struct device_attribute *attr, - char *buf) + char *buf) { - struct nvme_ns *ns = nvme_get_ns_from_dev(dev); - return sprintf(buf, "%8phd\n", ns->eui); + return sprintf(buf, "%8ph\n", dev_to_ns_head(dev)->ids.eui64); } static DEVICE_ATTR(eui, S_IRUGO, eui_show, NULL); static ssize_t nsid_show(struct device *dev, struct device_attribute *attr, - char *buf) + char *buf) { - struct nvme_ns *ns = nvme_get_ns_from_dev(dev); - return sprintf(buf, "%d\n", ns->ns_id); + return sprintf(buf, "%d\n", dev_to_ns_head(dev)->ns_id); } static DEVICE_ATTR(nsid, S_IRUGO, nsid_show, NULL); -static struct attribute *nvme_ns_attrs[] = { +static struct attribute *nvme_ns_id_attrs[] = { &dev_attr_wwid.attr, &dev_attr_uuid.attr, &dev_attr_nguid.attr, @@ -2130,31 +2519,31 @@ static struct attribute *nvme_ns_attrs[] = { NULL, }; -static umode_t nvme_ns_attrs_are_visible(struct kobject *kobj, +static umode_t nvme_ns_id_attrs_are_visible(struct kobject *kobj, struct attribute *a, int n) { struct device *dev = container_of(kobj, struct device, kobj); - struct nvme_ns *ns = nvme_get_ns_from_dev(dev); + struct nvme_ns_ids *ids = &dev_to_ns_head(dev)->ids; if (a == &dev_attr_uuid.attr) { - if (uuid_is_null(&ns->uuid) && - !memchr_inv(ns->nguid, 0, sizeof(ns->nguid))) + if (uuid_is_null(&ids->uuid) && + !memchr_inv(ids->nguid, 0, sizeof(ids->nguid))) return 0; } if (a == &dev_attr_nguid.attr) { - if (!memchr_inv(ns->nguid, 0, sizeof(ns->nguid))) + if (!memchr_inv(ids->nguid, 0, sizeof(ids->nguid))) return 0; } if (a == &dev_attr_eui.attr) { - if (!memchr_inv(ns->eui, 0, sizeof(ns->eui))) + if (!memchr_inv(ids->eui64, 0, sizeof(ids->eui64))) return 0; } return a->mode; } -static const struct attribute_group nvme_ns_attr_group = { - .attrs = nvme_ns_attrs, - .is_visible = nvme_ns_attrs_are_visible, +const struct attribute_group nvme_ns_id_attr_group = { + .attrs = nvme_ns_id_attrs, + .is_visible = nvme_ns_id_attrs_are_visible, }; #define nvme_show_str_function(field) \ @@ -2162,10 +2551,15 @@ static ssize_t field##_show(struct device *dev, \ struct device_attribute *attr, char *buf) \ { \ struct nvme_ctrl *ctrl = dev_get_drvdata(dev); \ - return sprintf(buf, "%.*s\n", (int)sizeof(ctrl->field), ctrl->field); \ + return sprintf(buf, "%.*s\n", \ + (int)sizeof(ctrl->subsys->field), ctrl->subsys->field); \ } \ static DEVICE_ATTR(field, S_IRUGO, field##_show, NULL); +nvme_show_str_function(model); +nvme_show_str_function(serial); +nvme_show_str_function(firmware_rev); + #define nvme_show_int_function(field) \ static ssize_t field##_show(struct device *dev, \ struct device_attribute *attr, char *buf) \ @@ -2175,9 +2569,6 @@ static ssize_t field##_show(struct device *dev, \ } \ static DEVICE_ATTR(field, S_IRUGO, field##_show, NULL); -nvme_show_str_function(model); -nvme_show_str_function(serial); -nvme_show_str_function(firmware_rev); nvme_show_int_function(cntlid); static ssize_t nvme_sysfs_delete(struct device *dev, @@ -2187,7 +2578,7 @@ static ssize_t nvme_sysfs_delete(struct device *dev, struct nvme_ctrl *ctrl = dev_get_drvdata(dev); if (device_remove_file_self(dev, attr)) - ctrl->ops->delete_ctrl(ctrl); + nvme_delete_ctrl_sync(ctrl); return count; } static DEVICE_ATTR(delete_controller, S_IWUSR, NULL, nvme_sysfs_delete); @@ -2231,7 +2622,7 @@ static ssize_t nvme_sysfs_show_subsysnqn(struct device *dev, { struct nvme_ctrl *ctrl = dev_get_drvdata(dev); - return snprintf(buf, PAGE_SIZE, "%s\n", ctrl->subnqn); + return snprintf(buf, PAGE_SIZE, "%s\n", ctrl->subsys->subnqn); } static DEVICE_ATTR(subsysnqn, S_IRUGO, nvme_sysfs_show_subsysnqn, NULL); @@ -2284,12 +2675,128 @@ static const struct attribute_group *nvme_dev_attr_groups[] = { NULL, }; +static struct nvme_ns_head *__nvme_find_ns_head(struct nvme_subsystem *subsys, + unsigned nsid) +{ + struct nvme_ns_head *h; + + lockdep_assert_held(&subsys->lock); + + list_for_each_entry(h, &subsys->nsheads, entry) { + if (h->ns_id == nsid && kref_get_unless_zero(&h->ref)) + return h; + } + + return NULL; +} + +static int __nvme_check_ids(struct nvme_subsystem *subsys, + struct nvme_ns_head *new) +{ + struct nvme_ns_head *h; + + lockdep_assert_held(&subsys->lock); + + list_for_each_entry(h, &subsys->nsheads, entry) { + if (nvme_ns_ids_valid(&new->ids) && + nvme_ns_ids_equal(&new->ids, &h->ids)) + return -EINVAL; + } + + return 0; +} + +static struct nvme_ns_head *nvme_alloc_ns_head(struct nvme_ctrl *ctrl, + unsigned nsid, struct nvme_id_ns *id) +{ + struct nvme_ns_head *head; + int ret = -ENOMEM; + + head = kzalloc(sizeof(*head), GFP_KERNEL); + if (!head) + goto out; + ret = ida_simple_get(&ctrl->subsys->ns_ida, 1, 0, GFP_KERNEL); + if (ret < 0) + goto out_free_head; + head->instance = ret; + INIT_LIST_HEAD(&head->list); + init_srcu_struct(&head->srcu); + head->subsys = ctrl->subsys; + head->ns_id = nsid; + kref_init(&head->ref); + + nvme_report_ns_ids(ctrl, nsid, id, &head->ids); + + ret = __nvme_check_ids(ctrl->subsys, head); + if (ret) { + dev_err(ctrl->device, + "duplicate IDs for nsid %d\n", nsid); + goto out_cleanup_srcu; + } + + ret = nvme_mpath_alloc_disk(ctrl, head); + if (ret) + goto out_cleanup_srcu; + + list_add_tail(&head->entry, &ctrl->subsys->nsheads); + return head; +out_cleanup_srcu: + cleanup_srcu_struct(&head->srcu); + ida_simple_remove(&ctrl->subsys->ns_ida, head->instance); +out_free_head: + kfree(head); +out: + return ERR_PTR(ret); +} + +static int nvme_init_ns_head(struct nvme_ns *ns, unsigned nsid, + struct nvme_id_ns *id, bool *new) +{ + struct nvme_ctrl *ctrl = ns->ctrl; + bool is_shared = id->nmic & (1 << 0); + struct nvme_ns_head *head = NULL; + int ret = 0; + + mutex_lock(&ctrl->subsys->lock); + if (is_shared) + head = __nvme_find_ns_head(ctrl->subsys, nsid); + if (!head) { + head = nvme_alloc_ns_head(ctrl, nsid, id); + if (IS_ERR(head)) { + ret = PTR_ERR(head); + goto out_unlock; + } + + *new = true; + } else { + struct nvme_ns_ids ids; + + nvme_report_ns_ids(ctrl, nsid, id, &ids); + if (!nvme_ns_ids_equal(&head->ids, &ids)) { + dev_err(ctrl->device, + "IDs don't match for shared namespace %d\n", + nsid); + ret = -EINVAL; + goto out_unlock; + } + + *new = false; + } + + list_add_tail(&ns->siblings, &head->list); + ns->head = head; + +out_unlock: + mutex_unlock(&ctrl->subsys->lock); + return ret; +} + static int ns_cmp(void *priv, struct list_head *a, struct list_head *b) { struct nvme_ns *nsa = container_of(a, struct nvme_ns, list); struct nvme_ns *nsb = container_of(b, struct nvme_ns, list); - return nsa->ns_id - nsb->ns_id; + return nsa->head->ns_id - nsb->head->ns_id; } static struct nvme_ns *nvme_find_get_ns(struct nvme_ctrl *ctrl, unsigned nsid) @@ -2298,12 +2805,13 @@ static struct nvme_ns *nvme_find_get_ns(struct nvme_ctrl *ctrl, unsigned nsid) mutex_lock(&ctrl->namespaces_mutex); list_for_each_entry(ns, &ctrl->namespaces, list) { - if (ns->ns_id == nsid) { - kref_get(&ns->kref); + if (ns->head->ns_id == nsid) { + if (!kref_get_unless_zero(&ns->kref)) + continue; ret = ns; break; } - if (ns->ns_id > nsid) + if (ns->head->ns_id > nsid) break; } mutex_unlock(&ctrl->namespaces_mutex); @@ -2318,7 +2826,7 @@ static int nvme_setup_streams_ns(struct nvme_ctrl *ctrl, struct nvme_ns *ns) if (!ctrl->nr_streams) return 0; - ret = nvme_get_stream_params(ctrl, &s, ns->ns_id); + ret = nvme_get_stream_params(ctrl, &s, ns->head->ns_id); if (ret) return ret; @@ -2342,33 +2850,27 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid) struct gendisk *disk; struct nvme_id_ns *id; char disk_name[DISK_NAME_LEN]; - int node = dev_to_node(ctrl->dev); + int node = dev_to_node(ctrl->dev), flags = GENHD_FL_EXT_DEVT; + bool new = true; ns = kzalloc_node(sizeof(*ns), GFP_KERNEL, node); if (!ns) return; - ns->instance = ida_simple_get(&ctrl->ns_ida, 1, 0, GFP_KERNEL); - if (ns->instance < 0) - goto out_free_ns; - ns->queue = blk_mq_init_queue(ctrl->tagset); if (IS_ERR(ns->queue)) - goto out_release_instance; + goto out_free_ns; queue_flag_set_unlocked(QUEUE_FLAG_NONROT, ns->queue); ns->queue->queuedata = ns; ns->ctrl = ctrl; kref_init(&ns->kref); - ns->ns_id = nsid; ns->lba_shift = 9; /* set to a default value for 512 until disk is validated */ blk_queue_logical_block_size(ns->queue, 1 << ns->lba_shift); nvme_set_queue_limits(ctrl, ns->queue); nvme_setup_streams_ns(ctrl, ns); - sprintf(disk_name, "nvme%dn%d", ctrl->instance, ns->instance); - id = nvme_identify_ns(ctrl, nsid); if (!id) goto out_free_queue; @@ -2376,23 +2878,49 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid) if (id->ncap == 0) goto out_free_id; - nvme_report_ns_ids(ctrl, ns->ns_id, id, ns->eui, ns->nguid, &ns->uuid); + if (nvme_init_ns_head(ns, nsid, id, &new)) + goto out_free_id; + +#ifdef CONFIG_NVME_MULTIPATH + /* + * If multipathing is enabled we need to always use the subsystem + * instance number for numbering our devices to avoid conflicts + * between subsystems that have multiple controllers and thus use + * the multipath-aware subsystem node and those that have a single + * controller and use the controller node directly. + */ + if (ns->head->disk) { + sprintf(disk_name, "nvme%dc%dn%d", ctrl->subsys->instance, + ctrl->cntlid, ns->head->instance); + flags = GENHD_FL_HIDDEN; + } else { + sprintf(disk_name, "nvme%dn%d", ctrl->subsys->instance, + ns->head->instance); + } +#else + /* + * But without the multipath code enabled, multiple controller per + * subsystems are visible as devices and thus we cannot use the + * subsystem instance. + */ + sprintf(disk_name, "nvme%dn%d", ctrl->instance, ns->head->instance); +#endif if ((ctrl->quirks & NVME_QUIRK_LIGHTNVM) && id->vs[0] == 0x1) { if (nvme_nvm_register(ns, disk_name, node)) { dev_warn(ctrl->device, "LightNVM init failure\n"); - goto out_free_id; + goto out_unlink_ns; } } disk = alloc_disk_node(0, node); if (!disk) - goto out_free_id; + goto out_unlink_ns; disk->fops = &nvme_fops; disk->private_data = ns; disk->queue = ns->queue; - disk->flags = GENHD_FL_EXT_DEVT; + disk->flags = flags; memcpy(disk->disk_name, disk_name, DISK_NAME_LEN); ns->disk = disk; @@ -2402,49 +2930,65 @@ static void nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid) list_add_tail(&ns->list, &ctrl->namespaces); mutex_unlock(&ctrl->namespaces_mutex); - kref_get(&ctrl->kref); + nvme_get_ctrl(ctrl); kfree(id); device_add_disk(ctrl->device, ns->disk); if (sysfs_create_group(&disk_to_dev(ns->disk)->kobj, - &nvme_ns_attr_group)) + &nvme_ns_id_attr_group)) pr_warn("%s: failed to create sysfs group for identification\n", ns->disk->disk_name); if (ns->ndev && nvme_nvm_register_sysfs(ns)) pr_warn("%s: failed to register lightnvm sysfs group for identification\n", ns->disk->disk_name); + + if (new) + nvme_mpath_add_disk(ns->head); + nvme_mpath_add_disk_links(ns); return; + out_unlink_ns: + mutex_lock(&ctrl->subsys->lock); + list_del_rcu(&ns->siblings); + mutex_unlock(&ctrl->subsys->lock); out_free_id: kfree(id); out_free_queue: blk_cleanup_queue(ns->queue); - out_release_instance: - ida_simple_remove(&ctrl->ns_ida, ns->instance); out_free_ns: kfree(ns); } static void nvme_ns_remove(struct nvme_ns *ns) { + struct nvme_ns_head *head = ns->head; + if (test_and_set_bit(NVME_NS_REMOVING, &ns->flags)) return; if (ns->disk && ns->disk->flags & GENHD_FL_UP) { if (blk_get_integrity(ns->disk)) blk_integrity_unregister(ns->disk); + nvme_mpath_remove_disk_links(ns); sysfs_remove_group(&disk_to_dev(ns->disk)->kobj, - &nvme_ns_attr_group); + &nvme_ns_id_attr_group); if (ns->ndev) nvme_nvm_unregister_sysfs(ns); del_gendisk(ns->disk); blk_cleanup_queue(ns->queue); } + mutex_lock(&ns->ctrl->subsys->lock); + nvme_mpath_clear_current_path(ns); + if (head) + list_del_rcu(&ns->siblings); + mutex_unlock(&ns->ctrl->subsys->lock); + mutex_lock(&ns->ctrl->namespaces_mutex); list_del_init(&ns->list); mutex_unlock(&ns->ctrl->namespaces_mutex); + synchronize_srcu(&head->srcu); nvme_put_ns(ns); } @@ -2467,7 +3011,7 @@ static void nvme_remove_invalid_namespaces(struct nvme_ctrl *ctrl, struct nvme_ns *ns, *next; list_for_each_entry_safe(ns, next, &ctrl->namespaces, list) { - if (ns->ns_id > nsid) + if (ns->head->ns_id > nsid) nvme_ns_remove(ns); } } @@ -2583,20 +3127,29 @@ void nvme_remove_namespaces(struct nvme_ctrl *ctrl) } EXPORT_SYMBOL_GPL(nvme_remove_namespaces); +static void nvme_aen_uevent(struct nvme_ctrl *ctrl) +{ + char *envp[2] = { NULL, NULL }; + u32 aen_result = ctrl->aen_result; + + ctrl->aen_result = 0; + if (!aen_result) + return; + + envp[0] = kasprintf(GFP_KERNEL, "NVME_AEN=%#08x", aen_result); + if (!envp[0]) + return; + kobject_uevent_env(&ctrl->device->kobj, KOBJ_CHANGE, envp); + kfree(envp[0]); +} + static void nvme_async_event_work(struct work_struct *work) { struct nvme_ctrl *ctrl = container_of(work, struct nvme_ctrl, async_event_work); - spin_lock_irq(&ctrl->lock); - while (ctrl->state == NVME_CTRL_LIVE && ctrl->event_limit > 0) { - int aer_idx = --ctrl->event_limit; - - spin_unlock_irq(&ctrl->lock); - ctrl->ops->submit_async_event(ctrl, aer_idx); - spin_lock_irq(&ctrl->lock); - } - spin_unlock_irq(&ctrl->lock); + nvme_aen_uevent(ctrl); + ctrl->ops->submit_async_event(ctrl); } static bool nvme_ctrl_pp_status(struct nvme_ctrl *ctrl) @@ -2615,18 +3168,13 @@ static bool nvme_ctrl_pp_status(struct nvme_ctrl *ctrl) static void nvme_get_fw_slot_info(struct nvme_ctrl *ctrl) { - struct nvme_command c = { }; struct nvme_fw_slot_info_log *log; log = kmalloc(sizeof(*log), GFP_KERNEL); if (!log) return; - c.common.opcode = nvme_admin_get_log_page; - c.common.nsid = cpu_to_le32(NVME_NSID_ALL); - c.common.cdw10[0] = nvme_get_log_dw10(NVME_LOG_FW_SLOT, sizeof(*log)); - - if (!nvme_submit_sync_cmd(ctrl->admin_q, &c, log, sizeof(*log))) + if (nvme_get_log(ctrl, NVME_LOG_FW_SLOT, log, sizeof(*log))) dev_warn(ctrl->device, "Get FW SLOT INFO log error\n"); kfree(log); @@ -2660,7 +3208,7 @@ static void nvme_fw_act_work(struct work_struct *work) return; nvme_start_queues(ctrl); - /* read FW slot informationi to clear the AER*/ + /* read FW slot information to clear the AER */ nvme_get_fw_slot_info(ctrl); } @@ -2668,24 +3216,21 @@ void nvme_complete_async_event(struct nvme_ctrl *ctrl, __le16 status, union nvme_result *res) { u32 result = le32_to_cpu(res->u32); - bool done = true; - switch (le16_to_cpu(status) >> 1) { - case NVME_SC_SUCCESS: - done = false; - /*FALLTHRU*/ - case NVME_SC_ABORT_REQ: - ++ctrl->event_limit; - if (ctrl->state == NVME_CTRL_LIVE) - queue_work(nvme_wq, &ctrl->async_event_work); + if (le16_to_cpu(status) >> 1 != NVME_SC_SUCCESS) + return; + + switch (result & 0x7) { + case NVME_AER_ERROR: + case NVME_AER_SMART: + case NVME_AER_CSS: + case NVME_AER_VS: + ctrl->aen_result = result; break; default: break; } - if (done) - return; - switch (result & 0xff07) { case NVME_AER_NOTICE_NS_CHANGED: dev_info(ctrl->device, "rescanning\n"); @@ -2697,44 +3242,9 @@ void nvme_complete_async_event(struct nvme_ctrl *ctrl, __le16 status, default: dev_warn(ctrl->device, "async event result %08x\n", result); } -} -EXPORT_SYMBOL_GPL(nvme_complete_async_event); - -void nvme_queue_async_events(struct nvme_ctrl *ctrl) -{ - ctrl->event_limit = NVME_NR_AERS; queue_work(nvme_wq, &ctrl->async_event_work); } -EXPORT_SYMBOL_GPL(nvme_queue_async_events); - -static DEFINE_IDA(nvme_instance_ida); - -static int nvme_set_instance(struct nvme_ctrl *ctrl) -{ - int instance, error; - - do { - if (!ida_pre_get(&nvme_instance_ida, GFP_KERNEL)) - return -ENODEV; - - spin_lock(&dev_list_lock); - error = ida_get_new(&nvme_instance_ida, &instance); - spin_unlock(&dev_list_lock); - } while (error == -EAGAIN); - - if (error) - return -ENODEV; - - ctrl->instance = instance; - return 0; -} - -static void nvme_release_instance(struct nvme_ctrl *ctrl) -{ - spin_lock(&dev_list_lock); - ida_remove(&nvme_instance_ida, ctrl->instance); - spin_unlock(&dev_list_lock); -} +EXPORT_SYMBOL_GPL(nvme_complete_async_event); void nvme_stop_ctrl(struct nvme_ctrl *ctrl) { @@ -2752,7 +3262,7 @@ void nvme_start_ctrl(struct nvme_ctrl *ctrl) if (ctrl->queue_count > 1) { nvme_queue_scan(ctrl); - nvme_queue_async_events(ctrl); + queue_work(nvme_wq, &ctrl->async_event_work); nvme_start_queues(ctrl); } } @@ -2760,30 +3270,31 @@ EXPORT_SYMBOL_GPL(nvme_start_ctrl); void nvme_uninit_ctrl(struct nvme_ctrl *ctrl) { - device_destroy(nvme_class, MKDEV(nvme_char_major, ctrl->instance)); - - spin_lock(&dev_list_lock); - list_del(&ctrl->node); - spin_unlock(&dev_list_lock); + cdev_device_del(&ctrl->cdev, ctrl->device); } EXPORT_SYMBOL_GPL(nvme_uninit_ctrl); -static void nvme_free_ctrl(struct kref *kref) +static void nvme_free_ctrl(struct device *dev) { - struct nvme_ctrl *ctrl = container_of(kref, struct nvme_ctrl, kref); + struct nvme_ctrl *ctrl = + container_of(dev, struct nvme_ctrl, ctrl_device); + struct nvme_subsystem *subsys = ctrl->subsys; - put_device(ctrl->device); - nvme_release_instance(ctrl); - ida_destroy(&ctrl->ns_ida); + ida_simple_remove(&nvme_instance_ida, ctrl->instance); + kfree(ctrl->effects); + + if (subsys) { + mutex_lock(&subsys->lock); + list_del(&ctrl->subsys_entry); + mutex_unlock(&subsys->lock); + sysfs_remove_link(&subsys->dev.kobj, dev_name(ctrl->device)); + } ctrl->ops->free_ctrl(ctrl); -} -void nvme_put_ctrl(struct nvme_ctrl *ctrl) -{ - kref_put(&ctrl->kref, nvme_free_ctrl); + if (subsys) + nvme_put_subsystem(subsys); } -EXPORT_SYMBOL_GPL(nvme_put_ctrl); /* * Initialize a NVMe controller structures. This needs to be called during @@ -2799,32 +3310,36 @@ int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev, spin_lock_init(&ctrl->lock); INIT_LIST_HEAD(&ctrl->namespaces); mutex_init(&ctrl->namespaces_mutex); - kref_init(&ctrl->kref); ctrl->dev = dev; ctrl->ops = ops; ctrl->quirks = quirks; INIT_WORK(&ctrl->scan_work, nvme_scan_work); INIT_WORK(&ctrl->async_event_work, nvme_async_event_work); INIT_WORK(&ctrl->fw_act_work, nvme_fw_act_work); + INIT_WORK(&ctrl->delete_work, nvme_delete_ctrl_work); - ret = nvme_set_instance(ctrl); - if (ret) + ret = ida_simple_get(&nvme_instance_ida, 0, 0, GFP_KERNEL); + if (ret < 0) goto out; - - ctrl->device = device_create_with_groups(nvme_class, ctrl->dev, - MKDEV(nvme_char_major, ctrl->instance), - ctrl, nvme_dev_attr_groups, - "nvme%d", ctrl->instance); - if (IS_ERR(ctrl->device)) { - ret = PTR_ERR(ctrl->device); + ctrl->instance = ret; + + device_initialize(&ctrl->ctrl_device); + ctrl->device = &ctrl->ctrl_device; + ctrl->device->devt = MKDEV(MAJOR(nvme_chr_devt), ctrl->instance); + ctrl->device->class = nvme_class; + ctrl->device->parent = ctrl->dev; + ctrl->device->groups = nvme_dev_attr_groups; + ctrl->device->release = nvme_free_ctrl; + dev_set_drvdata(ctrl->device, ctrl); + ret = dev_set_name(ctrl->device, "nvme%d", ctrl->instance); + if (ret) goto out_release_instance; - } - get_device(ctrl->device); - ida_init(&ctrl->ns_ida); - spin_lock(&dev_list_lock); - list_add_tail(&ctrl->node, &nvme_ctrl_list); - spin_unlock(&dev_list_lock); + cdev_init(&ctrl->cdev, &nvme_dev_fops); + ctrl->cdev.owner = ops->module; + ret = cdev_device_add(&ctrl->cdev, ctrl->device); + if (ret) + goto out_free_name; /* * Initialize latency tolerance controls. The sysfs files won't @@ -2835,8 +3350,10 @@ int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev, min(default_ps_max_latency_us, (unsigned long)S32_MAX)); return 0; +out_free_name: + kfree_const(dev->kobj.name); out_release_instance: - nvme_release_instance(ctrl); + ida_simple_remove(&nvme_instance_ida, ctrl->instance); out: return ret; } @@ -2945,6 +3462,16 @@ void nvme_start_queues(struct nvme_ctrl *ctrl) } EXPORT_SYMBOL_GPL(nvme_start_queues); +int nvme_reinit_tagset(struct nvme_ctrl *ctrl, struct blk_mq_tag_set *set) +{ + if (!ctrl->ops->reinit_request) + return 0; + + return blk_mq_tagset_iter(set, set->driver_data, + ctrl->ops->reinit_request); +} +EXPORT_SYMBOL_GPL(nvme_reinit_tagset); + int __init nvme_core_init(void) { int result; @@ -2954,12 +3481,9 @@ int __init nvme_core_init(void) if (!nvme_wq) return -ENOMEM; - result = __register_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme", - &nvme_dev_fops); + result = alloc_chrdev_region(&nvme_chr_devt, 0, NVME_MINORS, "nvme"); if (result < 0) goto destroy_wq; - else if (result > 0) - nvme_char_major = result; nvme_class = class_create(THIS_MODULE, "nvme"); if (IS_ERR(nvme_class)) { @@ -2967,10 +3491,17 @@ int __init nvme_core_init(void) goto unregister_chrdev; } + nvme_subsys_class = class_create(THIS_MODULE, "nvme-subsystem"); + if (IS_ERR(nvme_subsys_class)) { + result = PTR_ERR(nvme_subsys_class); + goto destroy_class; + } return 0; +destroy_class: + class_destroy(nvme_class); unregister_chrdev: - __unregister_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme"); + unregister_chrdev_region(nvme_chr_devt, NVME_MINORS); destroy_wq: destroy_workqueue(nvme_wq); return result; @@ -2978,8 +3509,10 @@ destroy_wq: void nvme_core_exit(void) { + ida_destroy(&nvme_subsystems_ida); + class_destroy(nvme_subsys_class); class_destroy(nvme_class); - __unregister_chrdev(nvme_char_major, 0, NVME_MINORS, "nvme"); + unregister_chrdev_region(nvme_chr_devt, NVME_MINORS); destroy_workqueue(nvme_wq); } diff --git a/drivers/nvme/host/fabrics.c b/drivers/nvme/host/fabrics.c index 555c976..76b4fe6 100644 --- a/drivers/nvme/host/fabrics.c +++ b/drivers/nvme/host/fabrics.c @@ -548,6 +548,7 @@ static const match_table_t opt_tokens = { { NVMF_OPT_HOSTNQN, "hostnqn=%s" }, { NVMF_OPT_HOST_TRADDR, "host_traddr=%s" }, { NVMF_OPT_HOST_ID, "hostid=%s" }, + { NVMF_OPT_DUP_CONNECT, "duplicate_connect" }, { NVMF_OPT_ERR, NULL } }; @@ -566,6 +567,7 @@ static int nvmf_parse_options(struct nvmf_ctrl_options *opts, opts->nr_io_queues = num_online_cpus(); opts->reconnect_delay = NVMF_DEF_RECONNECT_DELAY; opts->kato = NVME_DEFAULT_KATO; + opts->duplicate_connect = false; options = o = kstrdup(buf, GFP_KERNEL); if (!options) @@ -742,6 +744,9 @@ static int nvmf_parse_options(struct nvmf_ctrl_options *opts, goto out; } break; + case NVMF_OPT_DUP_CONNECT: + opts->duplicate_connect = true; + break; default: pr_warn("unknown parameter or missing value '%s' in ctrl creation request\n", p); @@ -823,7 +828,7 @@ EXPORT_SYMBOL_GPL(nvmf_free_options); #define NVMF_REQUIRED_OPTS (NVMF_OPT_TRANSPORT | NVMF_OPT_NQN) #define NVMF_ALLOWED_OPTS (NVMF_OPT_QUEUE_SIZE | NVMF_OPT_NR_IO_QUEUES | \ NVMF_OPT_KATO | NVMF_OPT_HOSTNQN | \ - NVMF_OPT_HOST_ID) + NVMF_OPT_HOST_ID | NVMF_OPT_DUP_CONNECT) static struct nvme_ctrl * nvmf_create_ctrl(struct device *dev, const char *buf, size_t count) @@ -841,6 +846,9 @@ nvmf_create_ctrl(struct device *dev, const char *buf, size_t count) if (ret) goto out_free_opts; + + request_module("nvme-%s", opts->transport); + /* * Check the generic options first as we need a valid transport for * the lookup below. Then clear the generic flags so that transport @@ -874,12 +882,12 @@ nvmf_create_ctrl(struct device *dev, const char *buf, size_t count) goto out_unlock; } - if (strcmp(ctrl->subnqn, opts->subsysnqn)) { + if (strcmp(ctrl->subsys->subnqn, opts->subsysnqn)) { dev_warn(ctrl->device, "controller returned incorrect NQN: \"%s\".\n", - ctrl->subnqn); + ctrl->subsys->subnqn); up_read(&nvmf_transports_rwsem); - ctrl->ops->delete_ctrl(ctrl); + nvme_delete_ctrl_sync(ctrl); return ERR_PTR(-EINVAL); } diff --git a/drivers/nvme/host/fabrics.h b/drivers/nvme/host/fabrics.h index bf33663..42232e7 100644 --- a/drivers/nvme/host/fabrics.h +++ b/drivers/nvme/host/fabrics.h @@ -57,6 +57,7 @@ enum { NVMF_OPT_HOST_TRADDR = 1 << 10, NVMF_OPT_CTRL_LOSS_TMO = 1 << 11, NVMF_OPT_HOST_ID = 1 << 12, + NVMF_OPT_DUP_CONNECT = 1 << 13, }; /** @@ -96,6 +97,7 @@ struct nvmf_ctrl_options { unsigned int nr_io_queues; unsigned int reconnect_delay; bool discovery_nqn; + bool duplicate_connect; unsigned int kato; struct nvmf_host *host; int max_reconnects; @@ -131,6 +133,18 @@ struct nvmf_transport_ops { struct nvmf_ctrl_options *opts); }; +static inline bool +nvmf_ctlr_matches_baseopts(struct nvme_ctrl *ctrl, + struct nvmf_ctrl_options *opts) +{ + if (strcmp(opts->subsysnqn, ctrl->opts->subsysnqn) || + strcmp(opts->host->nqn, ctrl->opts->host->nqn) || + memcmp(&opts->host->id, &ctrl->opts->host->id, sizeof(uuid_t))) + return false; + + return true; +} + int nvmf_reg_read32(struct nvme_ctrl *ctrl, u32 off, u32 *val); int nvmf_reg_read64(struct nvme_ctrl *ctrl, u32 off, u64 *val); int nvmf_reg_write32(struct nvme_ctrl *ctrl, u32 off, u32 val); diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c index be49d0f..7ab0be5 100644 --- a/drivers/nvme/host/fc.c +++ b/drivers/nvme/host/fc.c @@ -30,27 +30,19 @@ /* *************************** Data Structures/Defines ****************** */ -/* - * We handle AEN commands ourselves and don't even let the - * block layer know about them. - */ -#define NVME_FC_NR_AEN_COMMANDS 1 -#define NVME_FC_AQ_BLKMQ_DEPTH \ - (NVME_AQ_DEPTH - NVME_FC_NR_AEN_COMMANDS) -#define AEN_CMDID_BASE (NVME_FC_AQ_BLKMQ_DEPTH + 1) - enum nvme_fc_queue_flags { NVME_FC_Q_CONNECTED = (1 << 0), }; #define NVMEFC_QUEUE_DELAY 3 /* ms units */ +#define NVME_FC_DEFAULT_DEV_LOSS_TMO 60 /* seconds */ + struct nvme_fc_queue { struct nvme_fc_ctrl *ctrl; struct device *dev; struct blk_mq_hw_ctx *hctx; void *lldd_handle; - int queue_size; size_t cmnd_capsule_len; u32 qnum; u32 rqcnt; @@ -124,6 +116,7 @@ struct nvme_fc_lport { struct device *dev; /* physical device for dma */ struct nvme_fc_port_template *ops; struct kref ref; + atomic_t act_rport_cnt; } __aligned(sizeof(u64)); /* alignment for other things alloc'd with */ struct nvme_fc_rport { @@ -136,6 +129,8 @@ struct nvme_fc_rport { struct nvme_fc_lport *lport; spinlock_t lock; struct kref ref; + atomic_t act_ctrl_cnt; + unsigned long dev_loss_end; } __aligned(sizeof(u64)); /* alignment for other things alloc'd with */ enum nvme_fcctrl_flags { @@ -150,6 +145,7 @@ struct nvme_fc_ctrl { struct nvme_fc_rport *rport; u32 cnum; + bool assoc_active; u64 association_id; struct list_head ctrl_list; /* rport->ctrl_list */ @@ -157,7 +153,6 @@ struct nvme_fc_ctrl { struct blk_mq_tag_set admin_tag_set; struct blk_mq_tag_set tag_set; - struct work_struct delete_work; struct delayed_work connect_work; struct kref ref; @@ -165,7 +160,7 @@ struct nvme_fc_ctrl { u32 iocnt; wait_queue_head_t ioabort_wait; - struct nvme_fc_fcp_op aen_ops[NVME_FC_NR_AEN_COMMANDS]; + struct nvme_fc_fcp_op aen_ops[NVME_NR_AEN_COMMANDS]; struct nvme_ctrl ctrl; }; @@ -213,10 +208,16 @@ static DEFINE_IDA(nvme_fc_ctrl_cnt); +/* + * These items are short-term. They will eventually be moved into + * a generic FC class. See comments in module init. + */ +static struct class *fc_class; +static struct device *fc_udev_device; + /* *********************** FC-NVME Port Management ************************ */ -static int __nvme_fc_del_ctrl(struct nvme_fc_ctrl *); static void __nvme_fc_delete_hw_queue(struct nvme_fc_ctrl *, struct nvme_fc_queue *, unsigned int); @@ -235,9 +236,6 @@ nvme_fc_free_lport(struct kref *ref) list_del(&lport->port_list); spin_unlock_irqrestore(&nvme_fc_lock, flags); - /* let the LLDD know we've finished tearing it down */ - lport->ops->localport_delete(&lport->localport); - ida_simple_remove(&nvme_fc_local_port_cnt, lport->localport.port_num); ida_destroy(&lport->endp_cnt); @@ -260,7 +258,9 @@ nvme_fc_lport_get(struct nvme_fc_lport *lport) static struct nvme_fc_lport * -nvme_fc_attach_to_unreg_lport(struct nvme_fc_port_info *pinfo) +nvme_fc_attach_to_unreg_lport(struct nvme_fc_port_info *pinfo, + struct nvme_fc_port_template *ops, + struct device *dev) { struct nvme_fc_lport *lport; unsigned long flags; @@ -272,6 +272,11 @@ nvme_fc_attach_to_unreg_lport(struct nvme_fc_port_info *pinfo) lport->localport.port_name != pinfo->port_name) continue; + if (lport->dev != dev) { + lport = ERR_PTR(-EXDEV); + goto out_done; + } + if (lport->localport.port_state != FC_OBJSTATE_DELETED) { lport = ERR_PTR(-EEXIST); goto out_done; @@ -288,6 +293,7 @@ nvme_fc_attach_to_unreg_lport(struct nvme_fc_port_info *pinfo) /* resume the lport */ + lport->ops = ops; lport->localport.port_role = pinfo->port_role; lport->localport.port_id = pinfo->port_id; lport->localport.port_state = FC_OBJSTATE_ONLINE; @@ -348,7 +354,7 @@ nvme_fc_register_localport(struct nvme_fc_port_info *pinfo, * expired, we can simply re-enable the localport. Remoteports * and controller reconnections should resume naturally. */ - newrec = nvme_fc_attach_to_unreg_lport(pinfo); + newrec = nvme_fc_attach_to_unreg_lport(pinfo, template, dev); /* found an lport, but something about its state is bad */ if (IS_ERR(newrec)) { @@ -384,6 +390,7 @@ nvme_fc_register_localport(struct nvme_fc_port_info *pinfo, INIT_LIST_HEAD(&newrec->port_list); INIT_LIST_HEAD(&newrec->endp_list); kref_init(&newrec->ref); + atomic_set(&newrec->act_rport_cnt, 0); newrec->ops = template; newrec->dev = dev; ida_init(&newrec->endp_cnt); @@ -446,12 +453,177 @@ nvme_fc_unregister_localport(struct nvme_fc_local_port *portptr) spin_unlock_irqrestore(&nvme_fc_lock, flags); + if (atomic_read(&lport->act_rport_cnt) == 0) + lport->ops->localport_delete(&lport->localport); + nvme_fc_lport_put(lport); return 0; } EXPORT_SYMBOL_GPL(nvme_fc_unregister_localport); +/* + * TRADDR strings, per FC-NVME are fixed format: + * "nn-0x<16hexdigits>:pn-0x<16hexdigits>" - 43 characters + * udev event will only differ by prefix of what field is + * being specified: + * "NVMEFC_HOST_TRADDR=" or "NVMEFC_TRADDR=" - 19 max characters + * 19 + 43 + null_fudge = 64 characters + */ +#define FCNVME_TRADDR_LENGTH 64 + +static void +nvme_fc_signal_discovery_scan(struct nvme_fc_lport *lport, + struct nvme_fc_rport *rport) +{ + char hostaddr[FCNVME_TRADDR_LENGTH]; /* NVMEFC_HOST_TRADDR=...*/ + char tgtaddr[FCNVME_TRADDR_LENGTH]; /* NVMEFC_TRADDR=...*/ + char *envp[4] = { "FC_EVENT=nvmediscovery", hostaddr, tgtaddr, NULL }; + + if (!(rport->remoteport.port_role & FC_PORT_ROLE_NVME_DISCOVERY)) + return; + + snprintf(hostaddr, sizeof(hostaddr), + "NVMEFC_HOST_TRADDR=nn-0x%016llx:pn-0x%016llx", + lport->localport.node_name, lport->localport.port_name); + snprintf(tgtaddr, sizeof(tgtaddr), + "NVMEFC_TRADDR=nn-0x%016llx:pn-0x%016llx", + rport->remoteport.node_name, rport->remoteport.port_name); + kobject_uevent_env(&fc_udev_device->kobj, KOBJ_CHANGE, envp); +} + +static void +nvme_fc_free_rport(struct kref *ref) +{ + struct nvme_fc_rport *rport = + container_of(ref, struct nvme_fc_rport, ref); + struct nvme_fc_lport *lport = + localport_to_lport(rport->remoteport.localport); + unsigned long flags; + + WARN_ON(rport->remoteport.port_state != FC_OBJSTATE_DELETED); + WARN_ON(!list_empty(&rport->ctrl_list)); + + /* remove from lport list */ + spin_lock_irqsave(&nvme_fc_lock, flags); + list_del(&rport->endp_list); + spin_unlock_irqrestore(&nvme_fc_lock, flags); + + ida_simple_remove(&lport->endp_cnt, rport->remoteport.port_num); + + kfree(rport); + + nvme_fc_lport_put(lport); +} + +static void +nvme_fc_rport_put(struct nvme_fc_rport *rport) +{ + kref_put(&rport->ref, nvme_fc_free_rport); +} + +static int +nvme_fc_rport_get(struct nvme_fc_rport *rport) +{ + return kref_get_unless_zero(&rport->ref); +} + +static void +nvme_fc_resume_controller(struct nvme_fc_ctrl *ctrl) +{ + switch (ctrl->ctrl.state) { + case NVME_CTRL_NEW: + case NVME_CTRL_RECONNECTING: + /* + * As all reconnects were suppressed, schedule a + * connect. + */ + dev_info(ctrl->ctrl.device, + "NVME-FC{%d}: connectivity re-established. " + "Attempting reconnect\n", ctrl->cnum); + + queue_delayed_work(nvme_wq, &ctrl->connect_work, 0); + break; + + case NVME_CTRL_RESETTING: + /* + * Controller is already in the process of terminating the + * association. No need to do anything further. The reconnect + * step will naturally occur after the reset completes. + */ + break; + + default: + /* no action to take - let it delete */ + break; + } +} + +static struct nvme_fc_rport * +nvme_fc_attach_to_suspended_rport(struct nvme_fc_lport *lport, + struct nvme_fc_port_info *pinfo) +{ + struct nvme_fc_rport *rport; + struct nvme_fc_ctrl *ctrl; + unsigned long flags; + + spin_lock_irqsave(&nvme_fc_lock, flags); + + list_for_each_entry(rport, &lport->endp_list, endp_list) { + if (rport->remoteport.node_name != pinfo->node_name || + rport->remoteport.port_name != pinfo->port_name) + continue; + + if (!nvme_fc_rport_get(rport)) { + rport = ERR_PTR(-ENOLCK); + goto out_done; + } + + spin_unlock_irqrestore(&nvme_fc_lock, flags); + + spin_lock_irqsave(&rport->lock, flags); + + /* has it been unregistered */ + if (rport->remoteport.port_state != FC_OBJSTATE_DELETED) { + /* means lldd called us twice */ + spin_unlock_irqrestore(&rport->lock, flags); + nvme_fc_rport_put(rport); + return ERR_PTR(-ESTALE); + } + + rport->remoteport.port_state = FC_OBJSTATE_ONLINE; + rport->dev_loss_end = 0; + + /* + * kick off a reconnect attempt on all associations to the + * remote port. A successful reconnects will resume i/o. + */ + list_for_each_entry(ctrl, &rport->ctrl_list, ctrl_list) + nvme_fc_resume_controller(ctrl); + + spin_unlock_irqrestore(&rport->lock, flags); + + return rport; + } + + rport = NULL; + +out_done: + spin_unlock_irqrestore(&nvme_fc_lock, flags); + + return rport; +} + +static inline void +__nvme_fc_set_dev_loss_tmo(struct nvme_fc_rport *rport, + struct nvme_fc_port_info *pinfo) +{ + if (pinfo->dev_loss_tmo) + rport->remoteport.dev_loss_tmo = pinfo->dev_loss_tmo; + else + rport->remoteport.dev_loss_tmo = NVME_FC_DEFAULT_DEV_LOSS_TMO; +} + /** * nvme_fc_register_remoteport - transport entry point called by an * LLDD to register the existence of a NVME @@ -478,28 +650,52 @@ nvme_fc_register_remoteport(struct nvme_fc_local_port *localport, unsigned long flags; int ret, idx; + if (!nvme_fc_lport_get(lport)) { + ret = -ESHUTDOWN; + goto out_reghost_failed; + } + + /* + * look to see if there is already a remoteport that is waiting + * for a reconnect (within dev_loss_tmo) with the same WWN's. + * If so, transition to it and reconnect. + */ + newrec = nvme_fc_attach_to_suspended_rport(lport, pinfo); + + /* found an rport, but something about its state is bad */ + if (IS_ERR(newrec)) { + ret = PTR_ERR(newrec); + goto out_lport_put; + + /* found existing rport, which was resumed */ + } else if (newrec) { + nvme_fc_lport_put(lport); + __nvme_fc_set_dev_loss_tmo(newrec, pinfo); + nvme_fc_signal_discovery_scan(lport, newrec); + *portptr = &newrec->remoteport; + return 0; + } + + /* nothing found - allocate a new remoteport struct */ + newrec = kmalloc((sizeof(*newrec) + lport->ops->remote_priv_sz), GFP_KERNEL); if (!newrec) { ret = -ENOMEM; - goto out_reghost_failed; - } - - if (!nvme_fc_lport_get(lport)) { - ret = -ESHUTDOWN; - goto out_kfree_rport; + goto out_lport_put; } idx = ida_simple_get(&lport->endp_cnt, 0, 0, GFP_KERNEL); if (idx < 0) { ret = -ENOSPC; - goto out_lport_put; + goto out_kfree_rport; } INIT_LIST_HEAD(&newrec->endp_list); INIT_LIST_HEAD(&newrec->ctrl_list); INIT_LIST_HEAD(&newrec->ls_req_list); kref_init(&newrec->ref); + atomic_set(&newrec->act_ctrl_cnt, 0); spin_lock_init(&newrec->lock); newrec->remoteport.localport = &lport->localport; newrec->dev = lport->dev; @@ -511,63 +707,27 @@ nvme_fc_register_remoteport(struct nvme_fc_local_port *localport, newrec->remoteport.port_id = pinfo->port_id; newrec->remoteport.port_state = FC_OBJSTATE_ONLINE; newrec->remoteport.port_num = idx; + __nvme_fc_set_dev_loss_tmo(newrec, pinfo); spin_lock_irqsave(&nvme_fc_lock, flags); list_add_tail(&newrec->endp_list, &lport->endp_list); spin_unlock_irqrestore(&nvme_fc_lock, flags); + nvme_fc_signal_discovery_scan(lport, newrec); + *portptr = &newrec->remoteport; return 0; -out_lport_put: - nvme_fc_lport_put(lport); out_kfree_rport: kfree(newrec); +out_lport_put: + nvme_fc_lport_put(lport); out_reghost_failed: *portptr = NULL; return ret; } EXPORT_SYMBOL_GPL(nvme_fc_register_remoteport); -static void -nvme_fc_free_rport(struct kref *ref) -{ - struct nvme_fc_rport *rport = - container_of(ref, struct nvme_fc_rport, ref); - struct nvme_fc_lport *lport = - localport_to_lport(rport->remoteport.localport); - unsigned long flags; - - WARN_ON(rport->remoteport.port_state != FC_OBJSTATE_DELETED); - WARN_ON(!list_empty(&rport->ctrl_list)); - - /* remove from lport list */ - spin_lock_irqsave(&nvme_fc_lock, flags); - list_del(&rport->endp_list); - spin_unlock_irqrestore(&nvme_fc_lock, flags); - - /* let the LLDD know we've finished tearing it down */ - lport->ops->remoteport_delete(&rport->remoteport); - - ida_simple_remove(&lport->endp_cnt, rport->remoteport.port_num); - - kfree(rport); - - nvme_fc_lport_put(lport); -} - -static void -nvme_fc_rport_put(struct nvme_fc_rport *rport) -{ - kref_put(&rport->ref, nvme_fc_free_rport); -} - -static int -nvme_fc_rport_get(struct nvme_fc_rport *rport) -{ - return kref_get_unless_zero(&rport->ref); -} - static int nvme_fc_abort_lsops(struct nvme_fc_rport *rport) { @@ -592,6 +752,58 @@ restart: return 0; } +static void +nvme_fc_ctrl_connectivity_loss(struct nvme_fc_ctrl *ctrl) +{ + dev_info(ctrl->ctrl.device, + "NVME-FC{%d}: controller connectivity lost. Awaiting " + "Reconnect", ctrl->cnum); + + switch (ctrl->ctrl.state) { + case NVME_CTRL_NEW: + case NVME_CTRL_LIVE: + /* + * Schedule a controller reset. The reset will terminate the + * association and schedule the reconnect timer. Reconnects + * will be attempted until either the ctlr_loss_tmo + * (max_retries * connect_delay) expires or the remoteport's + * dev_loss_tmo expires. + */ + if (nvme_reset_ctrl(&ctrl->ctrl)) { + dev_warn(ctrl->ctrl.device, + "NVME-FC{%d}: Couldn't schedule reset. " + "Deleting controller.\n", + ctrl->cnum); + nvme_delete_ctrl(&ctrl->ctrl); + } + break; + + case NVME_CTRL_RECONNECTING: + /* + * The association has already been terminated and the + * controller is attempting reconnects. No need to do anything + * futher. Reconnects will be attempted until either the + * ctlr_loss_tmo (max_retries * connect_delay) expires or the + * remoteport's dev_loss_tmo expires. + */ + break; + + case NVME_CTRL_RESETTING: + /* + * Controller is already in the process of terminating the + * association. No need to do anything further. The reconnect + * step will kick in naturally after the association is + * terminated. + */ + break; + + case NVME_CTRL_DELETING: + default: + /* no action to take - let it delete */ + break; + } +} + /** * nvme_fc_unregister_remoteport - transport entry point called by an * LLDD to deregister/remove a previously @@ -621,19 +833,78 @@ nvme_fc_unregister_remoteport(struct nvme_fc_remote_port *portptr) } portptr->port_state = FC_OBJSTATE_DELETED; - /* tear down all associations to the remote port */ - list_for_each_entry(ctrl, &rport->ctrl_list, ctrl_list) - __nvme_fc_del_ctrl(ctrl); + rport->dev_loss_end = jiffies + (portptr->dev_loss_tmo * HZ); + + list_for_each_entry(ctrl, &rport->ctrl_list, ctrl_list) { + /* if dev_loss_tmo==0, dev loss is immediate */ + if (!portptr->dev_loss_tmo) { + dev_warn(ctrl->ctrl.device, + "NVME-FC{%d}: controller connectivity lost. " + "Deleting controller.\n", + ctrl->cnum); + nvme_delete_ctrl(&ctrl->ctrl); + } else + nvme_fc_ctrl_connectivity_loss(ctrl); + } spin_unlock_irqrestore(&rport->lock, flags); nvme_fc_abort_lsops(rport); + if (atomic_read(&rport->act_ctrl_cnt) == 0) + rport->lport->ops->remoteport_delete(portptr); + + /* + * release the reference, which will allow, if all controllers + * go away, which should only occur after dev_loss_tmo occurs, + * for the rport to be torn down. + */ nvme_fc_rport_put(rport); + return 0; } EXPORT_SYMBOL_GPL(nvme_fc_unregister_remoteport); +/** + * nvme_fc_rescan_remoteport - transport entry point called by an + * LLDD to request a nvme device rescan. + * @remoteport: pointer to the (registered) remote port that is to be + * rescanned. + * + * Returns: N/A + */ +void +nvme_fc_rescan_remoteport(struct nvme_fc_remote_port *remoteport) +{ + struct nvme_fc_rport *rport = remoteport_to_rport(remoteport); + + nvme_fc_signal_discovery_scan(rport->lport, rport); +} +EXPORT_SYMBOL_GPL(nvme_fc_rescan_remoteport); + +int +nvme_fc_set_remoteport_devloss(struct nvme_fc_remote_port *portptr, + u32 dev_loss_tmo) +{ + struct nvme_fc_rport *rport = remoteport_to_rport(portptr); + unsigned long flags; + + spin_lock_irqsave(&rport->lock, flags); + + if (portptr->port_state != FC_OBJSTATE_ONLINE) { + spin_unlock_irqrestore(&rport->lock, flags); + return -EINVAL; + } + + /* a dev_loss_tmo of 0 (immediate) is allowed to be set */ + rport->remoteport.dev_loss_tmo = dev_loss_tmo; + + spin_unlock_irqrestore(&rport->lock, flags); + + return 0; +} +EXPORT_SYMBOL_GPL(nvme_fc_set_remoteport_devloss); + /* *********************** FC-NVME DMA Handling **************************** */ @@ -723,7 +994,6 @@ fc_dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nents, dma_unmap_sg(dev, sg, nents, dir); } - /* *********************** FC-NVME LS Handling **************************** */ static void nvme_fc_ctrl_put(struct nvme_fc_ctrl *); @@ -1266,7 +1536,7 @@ nvme_fc_abort_aen_ops(struct nvme_fc_ctrl *ctrl) unsigned long flags; int i, ret; - for (i = 0; i < NVME_FC_NR_AEN_COMMANDS; i++, aen_op++) { + for (i = 0; i < NVME_NR_AEN_COMMANDS; i++, aen_op++) { if (atomic_read(&aen_op->state) != FCPOP_STATE_ACTIVE) continue; @@ -1331,7 +1601,7 @@ nvme_fc_fcpio_done(struct nvmefc_fcp_req *req) struct nvme_command *sqe = &op->cmd_iu.sqe; __le16 status = cpu_to_le16(NVME_SC_SUCCESS << 1); union nvme_result result; - bool complete_rq, terminate_assoc = true; + bool terminate_assoc = true; /* * WARNING: @@ -1373,8 +1643,9 @@ nvme_fc_fcpio_done(struct nvmefc_fcp_req *req) fc_dma_sync_single_for_cpu(ctrl->lport->dev, op->fcp_req.rspdma, sizeof(op->rsp_iu), DMA_FROM_DEVICE); - if (atomic_read(&op->state) == FCPOP_STATE_ABORTED) - status = cpu_to_le16((NVME_SC_ABORT_REQ | NVME_SC_DNR) << 1); + if (atomic_read(&op->state) == FCPOP_STATE_ABORTED || + op->flags & FCOP_FLAGS_TERMIO) + status = cpu_to_le16(NVME_SC_ABORT_REQ << 1); else if (freq->status) status = cpu_to_le16(NVME_SC_INTERNAL << 1); @@ -1438,23 +1709,27 @@ nvme_fc_fcpio_done(struct nvmefc_fcp_req *req) done: if (op->flags & FCOP_FLAGS_AEN) { nvme_complete_async_event(&queue->ctrl->ctrl, status, &result); - complete_rq = __nvme_fc_fcpop_chk_teardowns(ctrl, op); + __nvme_fc_fcpop_chk_teardowns(ctrl, op); atomic_set(&op->state, FCPOP_STATE_IDLE); op->flags = FCOP_FLAGS_AEN; /* clear other flags */ nvme_fc_ctrl_put(ctrl); goto check_error; } - complete_rq = __nvme_fc_fcpop_chk_teardowns(ctrl, op); - if (!complete_rq) { - if (unlikely(op->flags & FCOP_FLAGS_TERMIO)) { - status = cpu_to_le16(NVME_SC_ABORT_REQ << 1); - if (blk_queue_dying(rq->q)) - status |= cpu_to_le16(NVME_SC_DNR << 1); - } - nvme_end_request(rq, status, result); - } else + /* + * Force failures of commands if we're killing the controller + * or have an error on a command used to create an new association + */ + if (status && + (blk_queue_dying(rq->q) || + ctrl->ctrl.state == NVME_CTRL_NEW || + ctrl->ctrl.state == NVME_CTRL_RECONNECTING)) + status |= cpu_to_le16(NVME_SC_DNR << 1); + + if (__nvme_fc_fcpop_chk_teardowns(ctrl, op)) __nvme_fc_final_op_cleanup(rq); + else + nvme_end_request(rq, status, result); check_error: if (terminate_assoc) @@ -1531,7 +1806,7 @@ nvme_fc_init_aen_ops(struct nvme_fc_ctrl *ctrl) int i, ret; aen_op = ctrl->aen_ops; - for (i = 0; i < NVME_FC_NR_AEN_COMMANDS; i++, aen_op++) { + for (i = 0; i < NVME_NR_AEN_COMMANDS; i++, aen_op++) { private = kzalloc(ctrl->lport->ops->fcprqst_priv_sz, GFP_KERNEL); if (!private) @@ -1541,7 +1816,7 @@ nvme_fc_init_aen_ops(struct nvme_fc_ctrl *ctrl) sqe = &cmdiu->sqe; ret = __nvme_fc_init_request(ctrl, &ctrl->queues[0], aen_op, (struct request *)NULL, - (AEN_CMDID_BASE + i)); + (NVME_AQ_BLK_MQ_DEPTH + i)); if (ret) { kfree(private); return ret; @@ -1554,7 +1829,7 @@ nvme_fc_init_aen_ops(struct nvme_fc_ctrl *ctrl) memset(sqe, 0, sizeof(*sqe)); sqe->common.opcode = nvme_admin_async_event; /* Note: core layer may overwrite the sqe.command_id value */ - sqe->common.command_id = AEN_CMDID_BASE + i; + sqe->common.command_id = NVME_AQ_BLK_MQ_DEPTH + i; } return 0; } @@ -1566,7 +1841,7 @@ nvme_fc_term_aen_ops(struct nvme_fc_ctrl *ctrl) int i; aen_op = ctrl->aen_ops; - for (i = 0; i < NVME_FC_NR_AEN_COMMANDS; i++, aen_op++) { + for (i = 0; i < NVME_NR_AEN_COMMANDS; i++, aen_op++) { if (!aen_op->fcp_req.private) continue; @@ -1610,7 +1885,7 @@ nvme_fc_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data, } static void -nvme_fc_init_queue(struct nvme_fc_ctrl *ctrl, int idx, size_t queue_size) +nvme_fc_init_queue(struct nvme_fc_ctrl *ctrl, int idx) { struct nvme_fc_queue *queue; @@ -1626,8 +1901,6 @@ nvme_fc_init_queue(struct nvme_fc_ctrl *ctrl, int idx, size_t queue_size) else queue->cmnd_capsule_len = sizeof(struct nvme_command); - queue->queue_size = queue_size; - /* * Considered whether we should allocate buffers for all SQEs * and CQEs and dma map them - mapping their respective entries @@ -1751,7 +2024,7 @@ nvme_fc_init_io_queues(struct nvme_fc_ctrl *ctrl) int i; for (i = 1; i < ctrl->ctrl.queue_count; i++) - nvme_fc_init_queue(ctrl, i, ctrl->ctrl.sqsize); + nvme_fc_init_queue(ctrl, i); } static void @@ -1825,13 +2098,6 @@ nvme_fc_error_recovery(struct nvme_fc_ctrl *ctrl, char *errmsg) dev_warn(ctrl->ctrl.device, "NVME-FC{%d}: resetting controller\n", ctrl->cnum); - if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_RECONNECTING)) { - dev_err(ctrl->ctrl.device, - "NVME-FC{%d}: error_recovery: Couldn't change state " - "to RECONNECTING\n", ctrl->cnum); - return; - } - nvme_reset_ctrl(&ctrl->ctrl); } @@ -1842,13 +2108,14 @@ nvme_fc_timeout(struct request *rq, bool reserved) struct nvme_fc_ctrl *ctrl = op->ctrl; int ret; - if (reserved) + if (ctrl->rport->remoteport.port_state != FC_OBJSTATE_ONLINE || + atomic_read(&op->state) == FCPOP_STATE_ABORTED) return BLK_EH_RESET_TIMER; ret = __nvme_fc_abort_op(ctrl, op); if (ret) - /* io wasn't active to abort consider it done */ - return BLK_EH_HANDLED; + /* io wasn't active to abort */ + return BLK_EH_NOT_HANDLED; /* * we can't individually ABTS an io without affecting the queue, @@ -1859,7 +2126,12 @@ nvme_fc_timeout(struct request *rq, bool reserved) */ nvme_fc_error_recovery(ctrl, "io timeout error"); - return BLK_EH_HANDLED; + /* + * the io abort has been initiated. Have the reset timer + * restarted and the abort completion will complete the io + * shortly. Avoids a synchronous wait while the abort finishes. + */ + return BLK_EH_RESET_TIMER; } static int @@ -2110,7 +2382,7 @@ nvme_fc_poll(struct blk_mq_hw_ctx *hctx, unsigned int tag) } static void -nvme_fc_submit_async_event(struct nvme_ctrl *arg, int aer_idx) +nvme_fc_submit_async_event(struct nvme_ctrl *arg) { struct nvme_fc_ctrl *ctrl = to_fc_ctrl(arg); struct nvme_fc_fcp_op *aen_op; @@ -2118,9 +2390,6 @@ nvme_fc_submit_async_event(struct nvme_ctrl *arg, int aer_idx) bool terminating = false; blk_status_t ret; - if (aer_idx > NVME_FC_NR_AEN_COMMANDS) - return; - spin_lock_irqsave(&ctrl->lock, flags); if (ctrl->flags & FCCTRL_TERMIO) terminating = true; @@ -2129,13 +2398,13 @@ nvme_fc_submit_async_event(struct nvme_ctrl *arg, int aer_idx) if (terminating) return; - aen_op = &ctrl->aen_ops[aer_idx]; + aen_op = &ctrl->aen_ops[0]; ret = nvme_fc_start_fcp_op(ctrl, aen_op->queue, aen_op, 0, NVMEFC_FCP_NODATA); if (ret) dev_err(ctrl->ctrl.device, - "failed async event work [%d]\n", aer_idx); + "failed async event work\n"); } static void @@ -2337,7 +2606,7 @@ nvme_fc_reinit_io_queues(struct nvme_fc_ctrl *ctrl) nvme_fc_init_io_queues(ctrl); - ret = blk_mq_reinit_tagset(&ctrl->tag_set, nvme_fc_reinit_request); + ret = nvme_reinit_tagset(&ctrl->ctrl, ctrl->ctrl.tagset); if (ret) goto out_free_io_queues; @@ -2360,6 +2629,61 @@ out_free_io_queues: return ret; } +static void +nvme_fc_rport_active_on_lport(struct nvme_fc_rport *rport) +{ + struct nvme_fc_lport *lport = rport->lport; + + atomic_inc(&lport->act_rport_cnt); +} + +static void +nvme_fc_rport_inactive_on_lport(struct nvme_fc_rport *rport) +{ + struct nvme_fc_lport *lport = rport->lport; + u32 cnt; + + cnt = atomic_dec_return(&lport->act_rport_cnt); + if (cnt == 0 && lport->localport.port_state == FC_OBJSTATE_DELETED) + lport->ops->localport_delete(&lport->localport); +} + +static int +nvme_fc_ctlr_active_on_rport(struct nvme_fc_ctrl *ctrl) +{ + struct nvme_fc_rport *rport = ctrl->rport; + u32 cnt; + + if (ctrl->assoc_active) + return 1; + + ctrl->assoc_active = true; + cnt = atomic_inc_return(&rport->act_ctrl_cnt); + if (cnt == 1) + nvme_fc_rport_active_on_lport(rport); + + return 0; +} + +static int +nvme_fc_ctlr_inactive_on_rport(struct nvme_fc_ctrl *ctrl) +{ + struct nvme_fc_rport *rport = ctrl->rport; + struct nvme_fc_lport *lport = rport->lport; + u32 cnt; + + /* ctrl->assoc_active=false will be set independently */ + + cnt = atomic_dec_return(&rport->act_ctrl_cnt); + if (cnt == 0) { + if (rport->remoteport.port_state == FC_OBJSTATE_DELETED) + lport->ops->remoteport_delete(&rport->remoteport); + nvme_fc_rport_inactive_on_lport(rport); + } + + return 0; +} + /* * This routine restarts the controller on the host side, and * on the link side, recreates the controller association. @@ -2368,26 +2692,31 @@ static int nvme_fc_create_association(struct nvme_fc_ctrl *ctrl) { struct nvmf_ctrl_options *opts = ctrl->ctrl.opts; - u32 segs; int ret; bool changed; ++ctrl->ctrl.nr_reconnects; + if (ctrl->rport->remoteport.port_state != FC_OBJSTATE_ONLINE) + return -ENODEV; + + if (nvme_fc_ctlr_active_on_rport(ctrl)) + return -ENOTUNIQ; + /* * Create the admin queue */ - nvme_fc_init_queue(ctrl, 0, NVME_FC_AQ_BLKMQ_DEPTH); + nvme_fc_init_queue(ctrl, 0); ret = __nvme_fc_create_hw_queue(ctrl, &ctrl->queues[0], 0, - NVME_FC_AQ_BLKMQ_DEPTH); + NVME_AQ_BLK_MQ_DEPTH); if (ret) goto out_free_queue; ret = nvme_fc_connect_admin_queue(ctrl, &ctrl->queues[0], - NVME_FC_AQ_BLKMQ_DEPTH, - (NVME_FC_AQ_BLKMQ_DEPTH / 4)); + NVME_AQ_BLK_MQ_DEPTH, + (NVME_AQ_BLK_MQ_DEPTH / 4)); if (ret) goto out_delete_hw_queue; @@ -2419,9 +2748,8 @@ nvme_fc_create_association(struct nvme_fc_ctrl *ctrl) if (ret) goto out_disconnect_admin_queue; - segs = min_t(u32, NVME_FC_MAX_SEGMENTS, - ctrl->lport->ops->max_sgl_segments); - ctrl->ctrl.max_hw_sectors = (segs - 1) << (PAGE_SHIFT - 9); + ctrl->ctrl.max_hw_sectors = + (ctrl->lport->ops->max_sgl_segments - 1) << (PAGE_SHIFT - 9); ret = nvme_init_identify(&ctrl->ctrl); if (ret) @@ -2465,11 +2793,11 @@ nvme_fc_create_association(struct nvme_fc_ctrl *ctrl) } changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); - WARN_ON_ONCE(!changed); ctrl->ctrl.nr_reconnects = 0; - nvme_start_ctrl(&ctrl->ctrl); + if (changed) + nvme_start_ctrl(&ctrl->ctrl); return 0; /* Success */ @@ -2482,6 +2810,8 @@ out_delete_hw_queue: __nvme_fc_delete_hw_queue(ctrl, &ctrl->queues[0], 0); out_free_queue: nvme_fc_free_queue(&ctrl->queues[0]); + ctrl->assoc_active = false; + nvme_fc_ctlr_inactive_on_rport(ctrl); return ret; } @@ -2497,6 +2827,10 @@ nvme_fc_delete_association(struct nvme_fc_ctrl *ctrl) { unsigned long flags; + if (!ctrl->assoc_active) + return; + ctrl->assoc_active = false; + spin_lock_irqsave(&ctrl->lock, flags); ctrl->flags |= FCCTRL_TERMIO; ctrl->iocnt = 0; @@ -2537,7 +2871,8 @@ nvme_fc_delete_association(struct nvme_fc_ctrl *ctrl) * use blk_mq_tagset_busy_itr() and the transport routine to * terminate the exchanges. */ - blk_mq_quiesce_queue(ctrl->ctrl.admin_q); + if (ctrl->ctrl.state != NVME_CTRL_NEW) + blk_mq_quiesce_queue(ctrl->ctrl.admin_q); blk_mq_tagset_busy_iter(&ctrl->admin_tag_set, nvme_fc_terminate_exchange, &ctrl->ctrl); @@ -2568,102 +2903,64 @@ nvme_fc_delete_association(struct nvme_fc_ctrl *ctrl) __nvme_fc_delete_hw_queue(ctrl, &ctrl->queues[0], 0); nvme_fc_free_queue(&ctrl->queues[0]); + + nvme_fc_ctlr_inactive_on_rport(ctrl); } static void -nvme_fc_delete_ctrl_work(struct work_struct *work) +nvme_fc_delete_ctrl(struct nvme_ctrl *nctrl) { - struct nvme_fc_ctrl *ctrl = - container_of(work, struct nvme_fc_ctrl, delete_work); + struct nvme_fc_ctrl *ctrl = to_fc_ctrl(nctrl); - cancel_work_sync(&ctrl->ctrl.reset_work); cancel_delayed_work_sync(&ctrl->connect_work); - nvme_stop_ctrl(&ctrl->ctrl); - nvme_remove_namespaces(&ctrl->ctrl); /* * kill the association on the link side. this will block * waiting for io to terminate */ nvme_fc_delete_association(ctrl); - - /* - * tear down the controller - * After the last reference on the nvme ctrl is removed, - * the transport nvme_fc_nvme_ctrl_freed() callback will be - * invoked. From there, the transport will tear down it's - * logical queues and association. - */ - nvme_uninit_ctrl(&ctrl->ctrl); - - nvme_put_ctrl(&ctrl->ctrl); -} - -static bool -__nvme_fc_schedule_delete_work(struct nvme_fc_ctrl *ctrl) -{ - if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_DELETING)) - return true; - - if (!queue_work(nvme_wq, &ctrl->delete_work)) - return true; - - return false; -} - -static int -__nvme_fc_del_ctrl(struct nvme_fc_ctrl *ctrl) -{ - return __nvme_fc_schedule_delete_work(ctrl) ? -EBUSY : 0; -} - -/* - * Request from nvme core layer to delete the controller - */ -static int -nvme_fc_del_nvme_ctrl(struct nvme_ctrl *nctrl) -{ - struct nvme_fc_ctrl *ctrl = to_fc_ctrl(nctrl); - int ret; - - if (!kref_get_unless_zero(&ctrl->ctrl.kref)) - return -EBUSY; - - ret = __nvme_fc_del_ctrl(ctrl); - - if (!ret) - flush_workqueue(nvme_wq); - - nvme_put_ctrl(&ctrl->ctrl); - - return ret; } static void nvme_fc_reconnect_or_delete(struct nvme_fc_ctrl *ctrl, int status) { - /* If we are resetting/deleting then do nothing */ - if (ctrl->ctrl.state != NVME_CTRL_RECONNECTING) { - WARN_ON_ONCE(ctrl->ctrl.state == NVME_CTRL_NEW || - ctrl->ctrl.state == NVME_CTRL_LIVE); - return; - } + struct nvme_fc_rport *rport = ctrl->rport; + struct nvme_fc_remote_port *portptr = &rport->remoteport; + unsigned long recon_delay = ctrl->ctrl.opts->reconnect_delay * HZ; + bool recon = true; - dev_info(ctrl->ctrl.device, - "NVME-FC{%d}: reset: Reconnect attempt failed (%d)\n", - ctrl->cnum, status); + if (ctrl->ctrl.state != NVME_CTRL_RECONNECTING) + return; - if (nvmf_should_reconnect(&ctrl->ctrl)) { + if (portptr->port_state == FC_OBJSTATE_ONLINE) dev_info(ctrl->ctrl.device, - "NVME-FC{%d}: Reconnect attempt in %d seconds.\n", - ctrl->cnum, ctrl->ctrl.opts->reconnect_delay); - queue_delayed_work(nvme_wq, &ctrl->connect_work, - ctrl->ctrl.opts->reconnect_delay * HZ); + "NVME-FC{%d}: reset: Reconnect attempt failed (%d)\n", + ctrl->cnum, status); + else if (time_after_eq(jiffies, rport->dev_loss_end)) + recon = false; + + if (recon && nvmf_should_reconnect(&ctrl->ctrl)) { + if (portptr->port_state == FC_OBJSTATE_ONLINE) + dev_info(ctrl->ctrl.device, + "NVME-FC{%d}: Reconnect attempt in %ld " + "seconds\n", + ctrl->cnum, recon_delay / HZ); + else if (time_after(jiffies + recon_delay, rport->dev_loss_end)) + recon_delay = rport->dev_loss_end - jiffies; + + queue_delayed_work(nvme_wq, &ctrl->connect_work, recon_delay); } else { - dev_warn(ctrl->ctrl.device, + if (portptr->port_state == FC_OBJSTATE_ONLINE) + dev_warn(ctrl->ctrl.device, "NVME-FC{%d}: Max reconnect attempts (%d) " "reached. Removing controller\n", ctrl->cnum, ctrl->ctrl.nr_reconnects); - WARN_ON(__nvme_fc_schedule_delete_work(ctrl)); + else + dev_warn(ctrl->ctrl.device, + "NVME-FC{%d}: dev_loss_tmo (%d) expired " + "while waiting for remoteport connectivity. " + "Removing controller\n", ctrl->cnum, + portptr->dev_loss_tmo); + WARN_ON(nvme_delete_ctrl(&ctrl->ctrl)); } } @@ -2675,15 +2972,28 @@ nvme_fc_reset_ctrl_work(struct work_struct *work) int ret; nvme_stop_ctrl(&ctrl->ctrl); + /* will block will waiting for io to terminate */ nvme_fc_delete_association(ctrl); - ret = nvme_fc_create_association(ctrl); + if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_RECONNECTING)) { + dev_err(ctrl->ctrl.device, + "NVME-FC{%d}: error_recovery: Couldn't change state " + "to RECONNECTING\n", ctrl->cnum); + return; + } + + if (ctrl->rport->remoteport.port_state == FC_OBJSTATE_ONLINE) + ret = nvme_fc_create_association(ctrl); + else + ret = -ENOTCONN; + if (ret) nvme_fc_reconnect_or_delete(ctrl, ret); else dev_info(ctrl->ctrl.device, - "NVME-FC{%d}: controller reset complete\n", ctrl->cnum); + "NVME-FC{%d}: controller reset complete\n", + ctrl->cnum); } static const struct nvme_ctrl_ops nvme_fc_ctrl_ops = { @@ -2695,8 +3005,9 @@ static const struct nvme_ctrl_ops nvme_fc_ctrl_ops = { .reg_write32 = nvmf_reg_write32, .free_ctrl = nvme_fc_nvme_ctrl_freed, .submit_async_event = nvme_fc_submit_async_event, - .delete_ctrl = nvme_fc_del_nvme_ctrl, + .delete_ctrl = nvme_fc_delete_ctrl, .get_address = nvmf_get_address, + .reinit_request = nvme_fc_reinit_request, }; static void @@ -2728,6 +3039,33 @@ static const struct blk_mq_ops nvme_fc_admin_mq_ops = { }; +/* + * Fails a controller request if it matches an existing controller + * (association) with the same tuple: + * <Host NQN, Host ID, local FC port, remote FC port, SUBSYS NQN> + * + * The ports don't need to be compared as they are intrinsically + * already matched by the port pointers supplied. + */ +static bool +nvme_fc_existing_controller(struct nvme_fc_rport *rport, + struct nvmf_ctrl_options *opts) +{ + struct nvme_fc_ctrl *ctrl; + unsigned long flags; + bool found = false; + + spin_lock_irqsave(&rport->lock, flags); + list_for_each_entry(ctrl, &rport->ctrl_list, ctrl_list) { + found = nvmf_ctlr_matches_baseopts(&ctrl->ctrl, opts); + if (found) + break; + } + spin_unlock_irqrestore(&rport->lock, flags); + + return found; +} + static struct nvme_ctrl * nvme_fc_init_ctrl(struct device *dev, struct nvmf_ctrl_options *opts, struct nvme_fc_lport *lport, struct nvme_fc_rport *rport) @@ -2742,6 +3080,12 @@ nvme_fc_init_ctrl(struct device *dev, struct nvmf_ctrl_options *opts, goto out_fail; } + if (!opts->duplicate_connect && + nvme_fc_existing_controller(rport, opts)) { + ret = -EALREADY; + goto out_fail; + } + ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL); if (!ctrl) { ret = -ENOMEM; @@ -2760,12 +3104,12 @@ nvme_fc_init_ctrl(struct device *dev, struct nvmf_ctrl_options *opts, ctrl->rport = rport; ctrl->dev = lport->dev; ctrl->cnum = idx; + ctrl->assoc_active = false; init_waitqueue_head(&ctrl->ioabort_wait); get_device(ctrl->dev); kref_init(&ctrl->ref); - INIT_WORK(&ctrl->delete_work, nvme_fc_delete_ctrl_work); INIT_WORK(&ctrl->ctrl.reset_work, nvme_fc_reset_ctrl_work); INIT_DELAYED_WORK(&ctrl->connect_work, nvme_fc_connect_ctrl_work); spin_lock_init(&ctrl->lock); @@ -2787,7 +3131,7 @@ nvme_fc_init_ctrl(struct device *dev, struct nvmf_ctrl_options *opts, memset(&ctrl->admin_tag_set, 0, sizeof(ctrl->admin_tag_set)); ctrl->admin_tag_set.ops = &nvme_fc_admin_mq_ops; - ctrl->admin_tag_set.queue_depth = NVME_FC_AQ_BLKMQ_DEPTH; + ctrl->admin_tag_set.queue_depth = NVME_AQ_MQ_TAG_DEPTH; ctrl->admin_tag_set.reserved_tags = 2; /* fabric connect + Keep-Alive */ ctrl->admin_tag_set.numa_node = NUMA_NO_NODE; ctrl->admin_tag_set.cmd_size = sizeof(struct nvme_fc_fcp_op) + @@ -2797,6 +3141,7 @@ nvme_fc_init_ctrl(struct device *dev, struct nvmf_ctrl_options *opts, ctrl->admin_tag_set.driver_data = ctrl; ctrl->admin_tag_set.nr_hw_queues = 1; ctrl->admin_tag_set.timeout = ADMIN_TIMEOUT; + ctrl->admin_tag_set.flags = BLK_MQ_F_NO_SCHED; ret = blk_mq_alloc_tag_set(&ctrl->admin_tag_set); if (ret) @@ -2878,7 +3223,7 @@ nvme_fc_init_ctrl(struct device *dev, struct nvmf_ctrl_options *opts, return ERR_PTR(ret); } - kref_get(&ctrl->ctrl.kref); + nvme_get_ctrl(&ctrl->ctrl); dev_info(ctrl->ctrl.device, "NVME-FC{%d}: new ctrl: NQN \"%s\"\n", @@ -3026,7 +3371,50 @@ static struct nvmf_transport_ops nvme_fc_transport = { static int __init nvme_fc_init_module(void) { - return nvmf_register_transport(&nvme_fc_transport); + int ret; + + /* + * NOTE: + * It is expected that in the future the kernel will combine + * the FC-isms that are currently under scsi and now being + * added to by NVME into a new standalone FC class. The SCSI + * and NVME protocols and their devices would be under this + * new FC class. + * + * As we need something to post FC-specific udev events to, + * specifically for nvme probe events, start by creating the + * new device class. When the new standalone FC class is + * put in place, this code will move to a more generic + * location for the class. + */ + fc_class = class_create(THIS_MODULE, "fc"); + if (IS_ERR(fc_class)) { + pr_err("couldn't register class fc\n"); + return PTR_ERR(fc_class); + } + + /* + * Create a device for the FC-centric udev events + */ + fc_udev_device = device_create(fc_class, NULL, MKDEV(0, 0), NULL, + "fc_udev_device"); + if (IS_ERR(fc_udev_device)) { + pr_err("couldn't create fc_udev device!\n"); + ret = PTR_ERR(fc_udev_device); + goto out_destroy_class; + } + + ret = nvmf_register_transport(&nvme_fc_transport); + if (ret) + goto out_destroy_device; + + return 0; + +out_destroy_device: + device_destroy(fc_class, MKDEV(0, 0)); +out_destroy_class: + class_destroy(fc_class); + return ret; } static void __exit nvme_fc_exit_module(void) @@ -3039,6 +3427,9 @@ static void __exit nvme_fc_exit_module(void) ida_destroy(&nvme_fc_local_port_cnt); ida_destroy(&nvme_fc_ctrl_cnt); + + device_destroy(fc_class, MKDEV(0, 0)); + class_destroy(fc_class); } module_init(nvme_fc_init_module); diff --git a/drivers/nvme/host/lightnvm.c b/drivers/nvme/host/lightnvm.c index 1f79e3f..ba3d7f3 100644 --- a/drivers/nvme/host/lightnvm.c +++ b/drivers/nvme/host/lightnvm.c @@ -305,7 +305,7 @@ static int nvme_nvm_identity(struct nvm_dev *nvmdev, struct nvm_id *nvm_id) int ret; c.identity.opcode = nvme_nvm_admin_identity; - c.identity.nsid = cpu_to_le32(ns->ns_id); + c.identity.nsid = cpu_to_le32(ns->head->ns_id); c.identity.chnl_off = 0; nvme_nvm_id = kmalloc(sizeof(struct nvme_nvm_id), GFP_KERNEL); @@ -344,7 +344,7 @@ static int nvme_nvm_get_l2p_tbl(struct nvm_dev *nvmdev, u64 slba, u32 nlb, int ret = 0; c.l2p.opcode = nvme_nvm_admin_get_l2p_tbl; - c.l2p.nsid = cpu_to_le32(ns->ns_id); + c.l2p.nsid = cpu_to_le32(ns->head->ns_id); entries = kmalloc(len, GFP_KERNEL); if (!entries) return -ENOMEM; @@ -402,7 +402,7 @@ static int nvme_nvm_get_bb_tbl(struct nvm_dev *nvmdev, struct ppa_addr ppa, int ret = 0; c.get_bb.opcode = nvme_nvm_admin_get_bb_tbl; - c.get_bb.nsid = cpu_to_le32(ns->ns_id); + c.get_bb.nsid = cpu_to_le32(ns->head->ns_id); c.get_bb.spba = cpu_to_le64(ppa.ppa); bb_tbl = kzalloc(tblsz, GFP_KERNEL); @@ -452,7 +452,7 @@ static int nvme_nvm_set_bb_tbl(struct nvm_dev *nvmdev, struct ppa_addr *ppas, int ret = 0; c.set_bb.opcode = nvme_nvm_admin_set_bb_tbl; - c.set_bb.nsid = cpu_to_le32(ns->ns_id); + c.set_bb.nsid = cpu_to_le32(ns->head->ns_id); c.set_bb.spba = cpu_to_le64(ppas->ppa); c.set_bb.nlb = cpu_to_le16(nr_ppas - 1); c.set_bb.value = type; @@ -469,7 +469,7 @@ static inline void nvme_nvm_rqtocmd(struct nvm_rq *rqd, struct nvme_ns *ns, struct nvme_nvm_command *c) { c->ph_rw.opcode = rqd->opcode; - c->ph_rw.nsid = cpu_to_le32(ns->ns_id); + c->ph_rw.nsid = cpu_to_le32(ns->head->ns_id); c->ph_rw.spba = cpu_to_le64(rqd->ppa_addr.ppa); c->ph_rw.metadata = cpu_to_le64(rqd->dma_meta_list); c->ph_rw.control = cpu_to_le16(rqd->flags); @@ -492,34 +492,47 @@ static void nvme_nvm_end_io(struct request *rq, blk_status_t status) blk_mq_free_request(rq); } -static int nvme_nvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd) +static struct request *nvme_nvm_alloc_request(struct request_queue *q, + struct nvm_rq *rqd, + struct nvme_nvm_command *cmd) { - struct request_queue *q = dev->q; struct nvme_ns *ns = q->queuedata; struct request *rq; - struct bio *bio = rqd->bio; - struct nvme_nvm_command *cmd; - - cmd = kzalloc(sizeof(struct nvme_nvm_command), GFP_KERNEL); - if (!cmd) - return -ENOMEM; nvme_nvm_rqtocmd(rqd, ns, cmd); rq = nvme_alloc_request(q, (struct nvme_command *)cmd, 0, NVME_QID_ANY); - if (IS_ERR(rq)) { - kfree(cmd); - return PTR_ERR(rq); - } + if (IS_ERR(rq)) + return rq; + rq->cmd_flags &= ~REQ_FAILFAST_DRIVER; - if (bio) { - blk_init_request_from_bio(rq, bio); + if (rqd->bio) { + blk_init_request_from_bio(rq, rqd->bio); } else { rq->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, IOPRIO_NORM); rq->__data_len = 0; } + return rq; +} + +static int nvme_nvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd) +{ + struct request_queue *q = dev->q; + struct nvme_nvm_command *cmd; + struct request *rq; + + cmd = kzalloc(sizeof(struct nvme_nvm_command), GFP_KERNEL); + if (!cmd) + return -ENOMEM; + + rq = nvme_nvm_alloc_request(q, rqd, cmd); + if (IS_ERR(rq)) { + kfree(cmd); + return PTR_ERR(rq); + } + rq->end_io_data = rqd; blk_execute_rq_nowait(q, NULL, rq, 0, nvme_nvm_end_io); @@ -527,6 +540,34 @@ static int nvme_nvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd) return 0; } +static int nvme_nvm_submit_io_sync(struct nvm_dev *dev, struct nvm_rq *rqd) +{ + struct request_queue *q = dev->q; + struct request *rq; + struct nvme_nvm_command cmd; + int ret = 0; + + memset(&cmd, 0, sizeof(struct nvme_nvm_command)); + + rq = nvme_nvm_alloc_request(q, rqd, &cmd); + if (IS_ERR(rq)) + return PTR_ERR(rq); + + /* I/Os can fail and the error is signaled through rqd. Callers must + * handle the error accordingly. + */ + blk_execute_rq(q, NULL, rq, 0); + if (nvme_req(rq)->flags & NVME_REQ_CANCELLED) + ret = -EINTR; + + rqd->ppa_status = le64_to_cpu(nvme_req(rq)->result.u64); + rqd->error = nvme_req(rq)->status; + + blk_mq_free_request(rq); + + return ret; +} + static void *nvme_nvm_create_dma_pool(struct nvm_dev *nvmdev, char *name) { struct nvme_ns *ns = nvmdev->q->queuedata; @@ -562,6 +603,7 @@ static struct nvm_dev_ops nvme_nvm_dev_ops = { .set_bb_tbl = nvme_nvm_set_bb_tbl, .submit_io = nvme_nvm_submit_io, + .submit_io_sync = nvme_nvm_submit_io_sync, .create_dma_pool = nvme_nvm_create_dma_pool, .destroy_dma_pool = nvme_nvm_destroy_dma_pool, @@ -600,8 +642,6 @@ static int nvme_nvm_submit_user_cmd(struct request_queue *q, rq->timeout = timeout ? timeout : ADMIN_TIMEOUT; - rq->cmd_flags &= ~REQ_FAILFAST_DRIVER; - if (ppa_buf && ppa_len) { ppa_list = dma_pool_alloc(dev->dma_pool, GFP_KERNEL, &ppa_dma); if (!ppa_list) { @@ -691,7 +731,7 @@ static int nvme_nvm_submit_vio(struct nvme_ns *ns, memset(&c, 0, sizeof(c)); c.ph_rw.opcode = vio.opcode; - c.ph_rw.nsid = cpu_to_le32(ns->ns_id); + c.ph_rw.nsid = cpu_to_le32(ns->head->ns_id); c.ph_rw.control = cpu_to_le16(vio.control); c.ph_rw.length = cpu_to_le16(vio.nppas); @@ -728,7 +768,7 @@ static int nvme_nvm_user_vcmd(struct nvme_ns *ns, int admin, memset(&c, 0, sizeof(c)); c.common.opcode = vcmd.opcode; - c.common.nsid = cpu_to_le32(ns->ns_id); + c.common.nsid = cpu_to_le32(ns->head->ns_id); c.common.cdw2[0] = cpu_to_le32(vcmd.cdw2); c.common.cdw2[1] = cpu_to_le32(vcmd.cdw3); /* cdw11-12 */ diff --git a/drivers/nvme/host/multipath.c b/drivers/nvme/host/multipath.c new file mode 100644 index 0000000..78d9215 --- /dev/null +++ b/drivers/nvme/host/multipath.c @@ -0,0 +1,291 @@ +/* + * Copyright (c) 2017 Christoph Hellwig. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#include <linux/moduleparam.h> +#include "nvme.h" + +static bool multipath = true; +module_param(multipath, bool, 0644); +MODULE_PARM_DESC(multipath, + "turn on native support for multiple controllers per subsystem"); + +void nvme_failover_req(struct request *req) +{ + struct nvme_ns *ns = req->q->queuedata; + unsigned long flags; + + spin_lock_irqsave(&ns->head->requeue_lock, flags); + blk_steal_bios(&ns->head->requeue_list, req); + spin_unlock_irqrestore(&ns->head->requeue_lock, flags); + blk_mq_end_request(req, 0); + + nvme_reset_ctrl(ns->ctrl); + kblockd_schedule_work(&ns->head->requeue_work); +} + +bool nvme_req_needs_failover(struct request *req) +{ + if (!(req->cmd_flags & REQ_NVME_MPATH)) + return false; + + switch (nvme_req(req)->status & 0x7ff) { + /* + * Generic command status: + */ + case NVME_SC_INVALID_OPCODE: + case NVME_SC_INVALID_FIELD: + case NVME_SC_INVALID_NS: + case NVME_SC_LBA_RANGE: + case NVME_SC_CAP_EXCEEDED: + case NVME_SC_RESERVATION_CONFLICT: + return false; + + /* + * I/O command set specific error. Unfortunately these values are + * reused for fabrics commands, but those should never get here. + */ + case NVME_SC_BAD_ATTRIBUTES: + case NVME_SC_INVALID_PI: + case NVME_SC_READ_ONLY: + case NVME_SC_ONCS_NOT_SUPPORTED: + WARN_ON_ONCE(nvme_req(req)->cmd->common.opcode == + nvme_fabrics_command); + return false; + + /* + * Media and Data Integrity Errors: + */ + case NVME_SC_WRITE_FAULT: + case NVME_SC_READ_ERROR: + case NVME_SC_GUARD_CHECK: + case NVME_SC_APPTAG_CHECK: + case NVME_SC_REFTAG_CHECK: + case NVME_SC_COMPARE_FAILED: + case NVME_SC_ACCESS_DENIED: + case NVME_SC_UNWRITTEN_BLOCK: + return false; + } + + /* Everything else could be a path failure, so should be retried */ + return true; +} + +void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl) +{ + struct nvme_ns *ns; + + mutex_lock(&ctrl->namespaces_mutex); + list_for_each_entry(ns, &ctrl->namespaces, list) { + if (ns->head->disk) + kblockd_schedule_work(&ns->head->requeue_work); + } + mutex_unlock(&ctrl->namespaces_mutex); +} + +static struct nvme_ns *__nvme_find_path(struct nvme_ns_head *head) +{ + struct nvme_ns *ns; + + list_for_each_entry_rcu(ns, &head->list, siblings) { + if (ns->ctrl->state == NVME_CTRL_LIVE) { + rcu_assign_pointer(head->current_path, ns); + return ns; + } + } + + return NULL; +} + +inline struct nvme_ns *nvme_find_path(struct nvme_ns_head *head) +{ + struct nvme_ns *ns = srcu_dereference(head->current_path, &head->srcu); + + if (unlikely(!ns || ns->ctrl->state != NVME_CTRL_LIVE)) + ns = __nvme_find_path(head); + return ns; +} + +static blk_qc_t nvme_ns_head_make_request(struct request_queue *q, + struct bio *bio) +{ + struct nvme_ns_head *head = q->queuedata; + struct device *dev = disk_to_dev(head->disk); + struct nvme_ns *ns; + blk_qc_t ret = BLK_QC_T_NONE; + int srcu_idx; + + srcu_idx = srcu_read_lock(&head->srcu); + ns = nvme_find_path(head); + if (likely(ns)) { + bio->bi_disk = ns->disk; + bio->bi_opf |= REQ_NVME_MPATH; + ret = direct_make_request(bio); + } else if (!list_empty_careful(&head->list)) { + dev_warn_ratelimited(dev, "no path available - requeing I/O\n"); + + spin_lock_irq(&head->requeue_lock); + bio_list_add(&head->requeue_list, bio); + spin_unlock_irq(&head->requeue_lock); + } else { + dev_warn_ratelimited(dev, "no path - failing I/O\n"); + + bio->bi_status = BLK_STS_IOERR; + bio_endio(bio); + } + + srcu_read_unlock(&head->srcu, srcu_idx); + return ret; +} + +static bool nvme_ns_head_poll(struct request_queue *q, blk_qc_t qc) +{ + struct nvme_ns_head *head = q->queuedata; + struct nvme_ns *ns; + bool found = false; + int srcu_idx; + + srcu_idx = srcu_read_lock(&head->srcu); + ns = srcu_dereference(head->current_path, &head->srcu); + if (likely(ns && ns->ctrl->state == NVME_CTRL_LIVE)) + found = ns->queue->poll_fn(q, qc); + srcu_read_unlock(&head->srcu, srcu_idx); + return found; +} + +static void nvme_requeue_work(struct work_struct *work) +{ + struct nvme_ns_head *head = + container_of(work, struct nvme_ns_head, requeue_work); + struct bio *bio, *next; + + spin_lock_irq(&head->requeue_lock); + next = bio_list_get(&head->requeue_list); + spin_unlock_irq(&head->requeue_lock); + + while ((bio = next) != NULL) { + next = bio->bi_next; + bio->bi_next = NULL; + + /* + * Reset disk to the mpath node and resubmit to select a new + * path. + */ + bio->bi_disk = head->disk; + generic_make_request(bio); + } +} + +int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl, struct nvme_ns_head *head) +{ + struct request_queue *q; + bool vwc = false; + + bio_list_init(&head->requeue_list); + spin_lock_init(&head->requeue_lock); + INIT_WORK(&head->requeue_work, nvme_requeue_work); + + /* + * Add a multipath node if the subsystems supports multiple controllers. + * We also do this for private namespaces as the namespace sharing data could + * change after a rescan. + */ + if (!(ctrl->subsys->cmic & (1 << 1)) || !multipath) + return 0; + + q = blk_alloc_queue_node(GFP_KERNEL, NUMA_NO_NODE); + if (!q) + goto out; + q->queuedata = head; + blk_queue_make_request(q, nvme_ns_head_make_request); + q->poll_fn = nvme_ns_head_poll; + queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q); + /* set to a default value for 512 until disk is validated */ + blk_queue_logical_block_size(q, 512); + + /* we need to propagate up the VMC settings */ + if (ctrl->vwc & NVME_CTRL_VWC_PRESENT) + vwc = true; + blk_queue_write_cache(q, vwc, vwc); + + head->disk = alloc_disk(0); + if (!head->disk) + goto out_cleanup_queue; + head->disk->fops = &nvme_ns_head_ops; + head->disk->private_data = head; + head->disk->queue = q; + head->disk->flags = GENHD_FL_EXT_DEVT; + sprintf(head->disk->disk_name, "nvme%dn%d", + ctrl->subsys->instance, head->instance); + return 0; + +out_cleanup_queue: + blk_cleanup_queue(q); +out: + return -ENOMEM; +} + +void nvme_mpath_add_disk(struct nvme_ns_head *head) +{ + if (!head->disk) + return; + device_add_disk(&head->subsys->dev, head->disk); + if (sysfs_create_group(&disk_to_dev(head->disk)->kobj, + &nvme_ns_id_attr_group)) + pr_warn("%s: failed to create sysfs group for identification\n", + head->disk->disk_name); +} + +void nvme_mpath_add_disk_links(struct nvme_ns *ns) +{ + struct kobject *slave_disk_kobj, *holder_disk_kobj; + + if (!ns->head->disk) + return; + + slave_disk_kobj = &disk_to_dev(ns->disk)->kobj; + if (sysfs_create_link(ns->head->disk->slave_dir, slave_disk_kobj, + kobject_name(slave_disk_kobj))) + return; + + holder_disk_kobj = &disk_to_dev(ns->head->disk)->kobj; + if (sysfs_create_link(ns->disk->part0.holder_dir, holder_disk_kobj, + kobject_name(holder_disk_kobj))) + sysfs_remove_link(ns->head->disk->slave_dir, + kobject_name(slave_disk_kobj)); +} + +void nvme_mpath_remove_disk(struct nvme_ns_head *head) +{ + if (!head->disk) + return; + sysfs_remove_group(&disk_to_dev(head->disk)->kobj, + &nvme_ns_id_attr_group); + del_gendisk(head->disk); + blk_set_queue_dying(head->disk->queue); + /* make sure all pending bios are cleaned up */ + kblockd_schedule_work(&head->requeue_work); + flush_work(&head->requeue_work); + blk_cleanup_queue(head->disk->queue); + put_disk(head->disk); +} + +void nvme_mpath_remove_disk_links(struct nvme_ns *ns) +{ + if (!ns->head->disk) + return; + + sysfs_remove_link(ns->disk->part0.holder_dir, + kobject_name(&disk_to_dev(ns->head->disk)->kobj)); + sysfs_remove_link(ns->head->disk->slave_dir, + kobject_name(&disk_to_dev(ns->disk)->kobj)); +} diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h index d3f3c44..c0873a6 100644 --- a/drivers/nvme/host/nvme.h +++ b/drivers/nvme/host/nvme.h @@ -15,16 +15,17 @@ #define _NVME_H #include <linux/nvme.h> +#include <linux/cdev.h> #include <linux/pci.h> #include <linux/kref.h> #include <linux/blk-mq.h> #include <linux/lightnvm.h> #include <linux/sed-opal.h> -extern unsigned char nvme_io_timeout; +extern unsigned int nvme_io_timeout; #define NVME_IO_TIMEOUT (nvme_io_timeout * HZ) -extern unsigned char admin_timeout; +extern unsigned int admin_timeout; #define ADMIN_TIMEOUT (admin_timeout * HZ) #define NVME_DEFAULT_KATO 5 @@ -94,6 +95,11 @@ struct nvme_request { u16 status; }; +/* + * Mark a bio as coming in through the mpath node. + */ +#define REQ_NVME_MPATH REQ_DRV + enum { NVME_REQ_CANCELLED = (1 << 0), }; @@ -127,24 +133,23 @@ struct nvme_ctrl { struct request_queue *admin_q; struct request_queue *connect_q; struct device *dev; - struct kref kref; int instance; struct blk_mq_tag_set *tagset; struct blk_mq_tag_set *admin_tagset; struct list_head namespaces; struct mutex namespaces_mutex; + struct device ctrl_device; struct device *device; /* char device */ - struct list_head node; - struct ida ns_ida; + struct cdev cdev; struct work_struct reset_work; + struct work_struct delete_work; + + struct nvme_subsystem *subsys; + struct list_head subsys_entry; struct opal_dev *opal_dev; char name[12]; - char serial[20]; - char model[40]; - char firmware_rev[8]; - char subnqn[NVMF_NQN_SIZE]; u16 cntlid; u32 ctrl_config; @@ -155,23 +160,23 @@ struct nvme_ctrl { u32 page_size; u32 max_hw_sectors; u16 oncs; - u16 vid; u16 oacs; u16 nssa; u16 nr_streams; atomic_t abort_limit; - u8 event_limit; u8 vwc; u32 vs; u32 sgls; u16 kas; u8 npss; u8 apsta; + u32 aen_result; unsigned int shutdown_timeout; unsigned int kato; bool subsystem; unsigned long quirks; struct nvme_id_power_state psd[32]; + struct nvme_effects_log *effects; struct work_struct scan_work; struct work_struct async_event_work; struct delayed_work ka_work; @@ -197,21 +202,72 @@ struct nvme_ctrl { struct nvmf_ctrl_options *opts; }; +struct nvme_subsystem { + int instance; + struct device dev; + /* + * Because we unregister the device on the last put we need + * a separate refcount. + */ + struct kref ref; + struct list_head entry; + struct mutex lock; + struct list_head ctrls; + struct list_head nsheads; + char subnqn[NVMF_NQN_SIZE]; + char serial[20]; + char model[40]; + char firmware_rev[8]; + u8 cmic; + u16 vendor_id; + struct ida ns_ida; +}; + +/* + * Container structure for uniqueue namespace identifiers. + */ +struct nvme_ns_ids { + u8 eui64[8]; + u8 nguid[16]; + uuid_t uuid; +}; + +/* + * Anchor structure for namespaces. There is one for each namespace in a + * NVMe subsystem that any of our controllers can see, and the namespace + * structure for each controller is chained of it. For private namespaces + * there is a 1:1 relation to our namespace structures, that is ->list + * only ever has a single entry for private namespaces. + */ +struct nvme_ns_head { +#ifdef CONFIG_NVME_MULTIPATH + struct gendisk *disk; + struct nvme_ns __rcu *current_path; + struct bio_list requeue_list; + spinlock_t requeue_lock; + struct work_struct requeue_work; +#endif + struct list_head list; + struct srcu_struct srcu; + struct nvme_subsystem *subsys; + unsigned ns_id; + struct nvme_ns_ids ids; + struct list_head entry; + struct kref ref; + int instance; +}; + struct nvme_ns { struct list_head list; struct nvme_ctrl *ctrl; struct request_queue *queue; struct gendisk *disk; + struct list_head siblings; struct nvm_dev *ndev; struct kref kref; - int instance; + struct nvme_ns_head *head; - u8 eui[8]; - u8 nguid[16]; - uuid_t uuid; - - unsigned ns_id; int lba_shift; u16 ms; u16 sgs; @@ -234,9 +290,10 @@ struct nvme_ctrl_ops { int (*reg_write32)(struct nvme_ctrl *ctrl, u32 off, u32 val); int (*reg_read64)(struct nvme_ctrl *ctrl, u32 off, u64 *val); void (*free_ctrl)(struct nvme_ctrl *ctrl); - void (*submit_async_event)(struct nvme_ctrl *ctrl, int aer_idx); - int (*delete_ctrl)(struct nvme_ctrl *ctrl); + void (*submit_async_event)(struct nvme_ctrl *ctrl); + void (*delete_ctrl)(struct nvme_ctrl *ctrl); int (*get_address)(struct nvme_ctrl *ctrl, char *buf, int size); + int (*reinit_request)(void *data, struct request *rq); }; static inline bool nvme_ctrl_ready(struct nvme_ctrl *ctrl) @@ -278,6 +335,16 @@ static inline void nvme_end_request(struct request *req, __le16 status, blk_mq_complete_request(req); } +static inline void nvme_get_ctrl(struct nvme_ctrl *ctrl) +{ + get_device(ctrl->device); +} + +static inline void nvme_put_ctrl(struct nvme_ctrl *ctrl) +{ + put_device(ctrl->device); +} + void nvme_complete_rq(struct request *req); void nvme_cancel_request(struct request *req, void *data, bool reserved); bool nvme_change_ctrl_state(struct nvme_ctrl *ctrl, @@ -299,10 +366,8 @@ void nvme_remove_namespaces(struct nvme_ctrl *ctrl); int nvme_sec_submit(void *data, u16 spsp, u8 secp, void *buffer, size_t len, bool send); -#define NVME_NR_AERS 1 void nvme_complete_async_event(struct nvme_ctrl *ctrl, __le16 status, union nvme_result *res); -void nvme_queue_async_events(struct nvme_ctrl *ctrl); void nvme_stop_queues(struct nvme_ctrl *ctrl); void nvme_start_queues(struct nvme_ctrl *ctrl); @@ -311,21 +376,79 @@ void nvme_unfreeze(struct nvme_ctrl *ctrl); void nvme_wait_freeze(struct nvme_ctrl *ctrl); void nvme_wait_freeze_timeout(struct nvme_ctrl *ctrl, long timeout); void nvme_start_freeze(struct nvme_ctrl *ctrl); +int nvme_reinit_tagset(struct nvme_ctrl *ctrl, struct blk_mq_tag_set *set); #define NVME_QID_ANY -1 struct request *nvme_alloc_request(struct request_queue *q, - struct nvme_command *cmd, unsigned int flags, int qid); + struct nvme_command *cmd, blk_mq_req_flags_t flags, int qid); blk_status_t nvme_setup_cmd(struct nvme_ns *ns, struct request *req, struct nvme_command *cmd); int nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd, void *buf, unsigned bufflen); int __nvme_submit_sync_cmd(struct request_queue *q, struct nvme_command *cmd, union nvme_result *result, void *buffer, unsigned bufflen, - unsigned timeout, int qid, int at_head, int flags); + unsigned timeout, int qid, int at_head, + blk_mq_req_flags_t flags); int nvme_set_queue_count(struct nvme_ctrl *ctrl, int *count); void nvme_start_keep_alive(struct nvme_ctrl *ctrl); void nvme_stop_keep_alive(struct nvme_ctrl *ctrl); int nvme_reset_ctrl(struct nvme_ctrl *ctrl); +int nvme_delete_ctrl(struct nvme_ctrl *ctrl); +int nvme_delete_ctrl_sync(struct nvme_ctrl *ctrl); + +extern const struct attribute_group nvme_ns_id_attr_group; +extern const struct block_device_operations nvme_ns_head_ops; + +#ifdef CONFIG_NVME_MULTIPATH +void nvme_failover_req(struct request *req); +bool nvme_req_needs_failover(struct request *req); +void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl); +int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl,struct nvme_ns_head *head); +void nvme_mpath_add_disk(struct nvme_ns_head *head); +void nvme_mpath_add_disk_links(struct nvme_ns *ns); +void nvme_mpath_remove_disk(struct nvme_ns_head *head); +void nvme_mpath_remove_disk_links(struct nvme_ns *ns); + +static inline void nvme_mpath_clear_current_path(struct nvme_ns *ns) +{ + struct nvme_ns_head *head = ns->head; + + if (head && ns == srcu_dereference(head->current_path, &head->srcu)) + rcu_assign_pointer(head->current_path, NULL); +} +struct nvme_ns *nvme_find_path(struct nvme_ns_head *head); +#else +static inline void nvme_failover_req(struct request *req) +{ +} +static inline bool nvme_req_needs_failover(struct request *req) +{ + return false; +} +static inline void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl) +{ +} +static inline int nvme_mpath_alloc_disk(struct nvme_ctrl *ctrl, + struct nvme_ns_head *head) +{ + return 0; +} +static inline void nvme_mpath_add_disk(struct nvme_ns_head *head) +{ +} +static inline void nvme_mpath_remove_disk(struct nvme_ns_head *head) +{ +} +static inline void nvme_mpath_add_disk_links(struct nvme_ns *ns) +{ +} +static inline void nvme_mpath_remove_disk_links(struct nvme_ns *ns) +{ +} +static inline void nvme_mpath_clear_current_path(struct nvme_ns *ns) +{ +} +#endif /* CONFIG_NVME_MULTIPATH */ #ifdef CONFIG_NVM int nvme_nvm_register(struct nvme_ns *ns, char *disk_name, int node); diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index 3f5a04c..a11cfd4 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -13,7 +13,6 @@ */ #include <linux/aer.h> -#include <linux/bitops.h> #include <linux/blkdev.h> #include <linux/blk-mq.h> #include <linux/blk-mq-pci.h> @@ -26,12 +25,9 @@ #include <linux/mutex.h> #include <linux/once.h> #include <linux/pci.h> -#include <linux/poison.h> #include <linux/t10-pi.h> -#include <linux/timer.h> #include <linux/types.h> #include <linux/io-64-nonatomic-lo-hi.h> -#include <asm/unaligned.h> #include <linux/sed-opal.h> #include "nvme.h" @@ -39,11 +35,7 @@ #define SQ_SIZE(depth) (depth * sizeof(struct nvme_command)) #define CQ_SIZE(depth) (depth * sizeof(struct nvme_completion)) -/* - * We handle AEN commands ourselves and don't even let the - * block layer know about them. - */ -#define NVME_AQ_BLKMQ_DEPTH (NVME_AQ_DEPTH - NVME_NR_AERS) +#define SGES_PER_PAGE (PAGE_SIZE / sizeof(struct nvme_sgl_desc)) static int use_threaded_interrupts; module_param(use_threaded_interrupts, int, 0); @@ -57,6 +49,12 @@ module_param(max_host_mem_size_mb, uint, 0444); MODULE_PARM_DESC(max_host_mem_size_mb, "Maximum Host Memory Buffer (HMB) size per controller (in MiB)"); +static unsigned int sgl_threshold = SZ_32K; +module_param(sgl_threshold, uint, 0644); +MODULE_PARM_DESC(sgl_threshold, + "Use SGLs when average request segment size is larger or equal to " + "this size. Use 0 to disable SGLs."); + static int io_queue_depth_set(const char *val, const struct kernel_param *kp); static const struct kernel_param_ops io_queue_depth_ops = { .set = io_queue_depth_set, @@ -178,6 +176,7 @@ struct nvme_queue { struct nvme_iod { struct nvme_request req; struct nvme_queue *nvmeq; + bool use_sgl; int aborted; int npages; /* In the PRP list. 0 means small pool in use */ int nents; /* Used in scatterlist */ @@ -331,17 +330,35 @@ static int nvme_npages(unsigned size, struct nvme_dev *dev) return DIV_ROUND_UP(8 * nprps, PAGE_SIZE - 8); } -static unsigned int nvme_iod_alloc_size(struct nvme_dev *dev, - unsigned int size, unsigned int nseg) +/* + * Calculates the number of pages needed for the SGL segments. For example a 4k + * page can accommodate 256 SGL descriptors. + */ +static int nvme_pci_npages_sgl(unsigned int num_seg) { - return sizeof(__le64 *) * nvme_npages(size, dev) + - sizeof(struct scatterlist) * nseg; + return DIV_ROUND_UP(num_seg * sizeof(struct nvme_sgl_desc), PAGE_SIZE); } -static unsigned int nvme_cmd_size(struct nvme_dev *dev) +static unsigned int nvme_pci_iod_alloc_size(struct nvme_dev *dev, + unsigned int size, unsigned int nseg, bool use_sgl) { - return sizeof(struct nvme_iod) + - nvme_iod_alloc_size(dev, NVME_INT_BYTES(dev), NVME_INT_PAGES); + size_t alloc_size; + + if (use_sgl) + alloc_size = sizeof(__le64 *) * nvme_pci_npages_sgl(nseg); + else + alloc_size = sizeof(__le64 *) * nvme_npages(size, dev); + + return alloc_size + sizeof(struct scatterlist) * nseg; +} + +static unsigned int nvme_pci_cmd_size(struct nvme_dev *dev, bool use_sgl) +{ + unsigned int alloc_size = nvme_pci_iod_alloc_size(dev, + NVME_INT_BYTES(dev), NVME_INT_PAGES, + use_sgl); + + return sizeof(struct nvme_iod) + alloc_size; } static int nvme_admin_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, @@ -425,10 +442,10 @@ static void __nvme_submit_cmd(struct nvme_queue *nvmeq, nvmeq->sq_tail = tail; } -static __le64 **iod_list(struct request *req) +static void **nvme_pci_iod_list(struct request *req) { struct nvme_iod *iod = blk_mq_rq_to_pdu(req); - return (__le64 **)(iod->sg + blk_rq_nr_phys_segments(req)); + return (void **)(iod->sg + blk_rq_nr_phys_segments(req)); } static blk_status_t nvme_init_iod(struct request *rq, struct nvme_dev *dev) @@ -438,7 +455,10 @@ static blk_status_t nvme_init_iod(struct request *rq, struct nvme_dev *dev) unsigned int size = blk_rq_payload_bytes(rq); if (nseg > NVME_INT_PAGES || size > NVME_INT_BYTES(dev)) { - iod->sg = kmalloc(nvme_iod_alloc_size(dev, size, nseg), GFP_ATOMIC); + size_t alloc_size = nvme_pci_iod_alloc_size(dev, size, nseg, + iod->use_sgl); + + iod->sg = kmalloc(alloc_size, GFP_ATOMIC); if (!iod->sg) return BLK_STS_RESOURCE; } else { @@ -456,18 +476,31 @@ static blk_status_t nvme_init_iod(struct request *rq, struct nvme_dev *dev) static void nvme_free_iod(struct nvme_dev *dev, struct request *req) { struct nvme_iod *iod = blk_mq_rq_to_pdu(req); - const int last_prp = dev->ctrl.page_size / 8 - 1; + const int last_prp = dev->ctrl.page_size / sizeof(__le64) - 1; + dma_addr_t dma_addr = iod->first_dma, next_dma_addr; + int i; - __le64 **list = iod_list(req); - dma_addr_t prp_dma = iod->first_dma; if (iod->npages == 0) - dma_pool_free(dev->prp_small_pool, list[0], prp_dma); + dma_pool_free(dev->prp_small_pool, nvme_pci_iod_list(req)[0], + dma_addr); + for (i = 0; i < iod->npages; i++) { - __le64 *prp_list = list[i]; - dma_addr_t next_prp_dma = le64_to_cpu(prp_list[last_prp]); - dma_pool_free(dev->prp_page_pool, prp_list, prp_dma); - prp_dma = next_prp_dma; + void *addr = nvme_pci_iod_list(req)[i]; + + if (iod->use_sgl) { + struct nvme_sgl_desc *sg_list = addr; + + next_dma_addr = + le64_to_cpu((sg_list[SGES_PER_PAGE - 1]).addr); + } else { + __le64 *prp_list = addr; + + next_dma_addr = le64_to_cpu(prp_list[last_prp]); + } + + dma_pool_free(dev->prp_page_pool, addr, dma_addr); + dma_addr = next_dma_addr; } if (iod->sg != iod->inline_sg) @@ -555,7 +588,8 @@ static void nvme_print_sgl(struct scatterlist *sgl, int nents) } } -static blk_status_t nvme_setup_prps(struct nvme_dev *dev, struct request *req) +static blk_status_t nvme_pci_setup_prps(struct nvme_dev *dev, + struct request *req, struct nvme_rw_command *cmnd) { struct nvme_iod *iod = blk_mq_rq_to_pdu(req); struct dma_pool *pool; @@ -566,14 +600,16 @@ static blk_status_t nvme_setup_prps(struct nvme_dev *dev, struct request *req) u32 page_size = dev->ctrl.page_size; int offset = dma_addr & (page_size - 1); __le64 *prp_list; - __le64 **list = iod_list(req); + void **list = nvme_pci_iod_list(req); dma_addr_t prp_dma; int nprps, i; + iod->use_sgl = false; + length -= (page_size - offset); if (length <= 0) { iod->first_dma = 0; - return BLK_STS_OK; + goto done; } dma_len -= (page_size - offset); @@ -587,7 +623,7 @@ static blk_status_t nvme_setup_prps(struct nvme_dev *dev, struct request *req) if (length <= page_size) { iod->first_dma = dma_addr; - return BLK_STS_OK; + goto done; } nprps = DIV_ROUND_UP(length, page_size); @@ -634,6 +670,10 @@ static blk_status_t nvme_setup_prps(struct nvme_dev *dev, struct request *req) dma_len = sg_dma_len(sg); } +done: + cmnd->dptr.prp1 = cpu_to_le64(sg_dma_address(iod->sg)); + cmnd->dptr.prp2 = cpu_to_le64(iod->first_dma); + return BLK_STS_OK; bad_sgl: @@ -643,6 +683,110 @@ static blk_status_t nvme_setup_prps(struct nvme_dev *dev, struct request *req) return BLK_STS_IOERR; } +static void nvme_pci_sgl_set_data(struct nvme_sgl_desc *sge, + struct scatterlist *sg) +{ + sge->addr = cpu_to_le64(sg_dma_address(sg)); + sge->length = cpu_to_le32(sg_dma_len(sg)); + sge->type = NVME_SGL_FMT_DATA_DESC << 4; +} + +static void nvme_pci_sgl_set_seg(struct nvme_sgl_desc *sge, + dma_addr_t dma_addr, int entries) +{ + sge->addr = cpu_to_le64(dma_addr); + if (entries < SGES_PER_PAGE) { + sge->length = cpu_to_le32(entries * sizeof(*sge)); + sge->type = NVME_SGL_FMT_LAST_SEG_DESC << 4; + } else { + sge->length = cpu_to_le32(PAGE_SIZE); + sge->type = NVME_SGL_FMT_SEG_DESC << 4; + } +} + +static blk_status_t nvme_pci_setup_sgls(struct nvme_dev *dev, + struct request *req, struct nvme_rw_command *cmd) +{ + struct nvme_iod *iod = blk_mq_rq_to_pdu(req); + int length = blk_rq_payload_bytes(req); + struct dma_pool *pool; + struct nvme_sgl_desc *sg_list; + struct scatterlist *sg = iod->sg; + int entries = iod->nents, i = 0; + dma_addr_t sgl_dma; + + iod->use_sgl = true; + + /* setting the transfer type as SGL */ + cmd->flags = NVME_CMD_SGL_METABUF; + + if (length == sg_dma_len(sg)) { + nvme_pci_sgl_set_data(&cmd->dptr.sgl, sg); + return BLK_STS_OK; + } + + if (entries <= (256 / sizeof(struct nvme_sgl_desc))) { + pool = dev->prp_small_pool; + iod->npages = 0; + } else { + pool = dev->prp_page_pool; + iod->npages = 1; + } + + sg_list = dma_pool_alloc(pool, GFP_ATOMIC, &sgl_dma); + if (!sg_list) { + iod->npages = -1; + return BLK_STS_RESOURCE; + } + + nvme_pci_iod_list(req)[0] = sg_list; + iod->first_dma = sgl_dma; + + nvme_pci_sgl_set_seg(&cmd->dptr.sgl, sgl_dma, entries); + + do { + if (i == SGES_PER_PAGE) { + struct nvme_sgl_desc *old_sg_desc = sg_list; + struct nvme_sgl_desc *link = &old_sg_desc[i - 1]; + + sg_list = dma_pool_alloc(pool, GFP_ATOMIC, &sgl_dma); + if (!sg_list) + return BLK_STS_RESOURCE; + + i = 0; + nvme_pci_iod_list(req)[iod->npages++] = sg_list; + sg_list[i++] = *link; + nvme_pci_sgl_set_seg(link, sgl_dma, entries); + } + + nvme_pci_sgl_set_data(&sg_list[i++], sg); + + length -= sg_dma_len(sg); + sg = sg_next(sg); + entries--; + } while (length > 0); + + WARN_ON(entries > 0); + return BLK_STS_OK; +} + +static inline bool nvme_pci_use_sgls(struct nvme_dev *dev, struct request *req) +{ + struct nvme_iod *iod = blk_mq_rq_to_pdu(req); + unsigned int avg_seg_size; + + avg_seg_size = DIV_ROUND_UP(blk_rq_payload_bytes(req), + blk_rq_nr_phys_segments(req)); + + if (!(dev->ctrl.sgls & ((1 << 0) | (1 << 1)))) + return false; + if (!iod->nvmeq->qid) + return false; + if (!sgl_threshold || avg_seg_size < sgl_threshold) + return false; + return true; +} + static blk_status_t nvme_map_data(struct nvme_dev *dev, struct request *req, struct nvme_command *cmnd) { @@ -662,7 +806,11 @@ static blk_status_t nvme_map_data(struct nvme_dev *dev, struct request *req, DMA_ATTR_NO_WARN)) goto out; - ret = nvme_setup_prps(dev, req); + if (nvme_pci_use_sgls(dev, req)) + ret = nvme_pci_setup_sgls(dev, req, &cmnd->rw); + else + ret = nvme_pci_setup_prps(dev, req, &cmnd->rw); + if (ret != BLK_STS_OK) goto out_unmap; @@ -682,8 +830,6 @@ static blk_status_t nvme_map_data(struct nvme_dev *dev, struct request *req, goto out_unmap; } - cmnd->rw.dptr.prp1 = cpu_to_le64(sg_dma_address(iod->sg)); - cmnd->rw.dptr.prp2 = cpu_to_le64(iod->first_dma); if (blk_integrity_rq(req)) cmnd->rw.metadata = cpu_to_le64(sg_dma_address(&iod->meta_sg)); return BLK_STS_OK; @@ -804,7 +950,7 @@ static inline void nvme_handle_cqe(struct nvme_queue *nvmeq, * for them but rather special case them here. */ if (unlikely(nvmeq->qid == 0 && - cqe->command_id >= NVME_AQ_BLKMQ_DEPTH)) { + cqe->command_id >= NVME_AQ_BLK_MQ_DEPTH)) { nvme_complete_async_event(&nvmeq->dev->ctrl, cqe->status, &cqe->result); return; @@ -897,7 +1043,7 @@ static int nvme_poll(struct blk_mq_hw_ctx *hctx, unsigned int tag) return __nvme_poll(nvmeq, tag); } -static void nvme_pci_submit_async_event(struct nvme_ctrl *ctrl, int aer_idx) +static void nvme_pci_submit_async_event(struct nvme_ctrl *ctrl) { struct nvme_dev *dev = to_nvme_dev(ctrl); struct nvme_queue *nvmeq = dev->queues[0]; @@ -905,7 +1051,7 @@ static void nvme_pci_submit_async_event(struct nvme_ctrl *ctrl, int aer_idx) memset(&c, 0, sizeof(c)); c.common.opcode = nvme_admin_async_event; - c.common.command_id = NVME_AQ_BLKMQ_DEPTH + aer_idx; + c.common.command_id = NVME_AQ_BLK_MQ_DEPTH; spin_lock_irq(&nvmeq->q_lock); __nvme_submit_cmd(nvmeq, &c); @@ -930,7 +1076,7 @@ static int adapter_alloc_cq(struct nvme_dev *dev, u16 qid, int flags = NVME_QUEUE_PHYS_CONTIG | NVME_CQ_IRQ_ENABLED; /* - * Note: we (ab)use the fact the the prp fields survive if no data + * Note: we (ab)use the fact that the prp fields survive if no data * is attached to the request. */ memset(&c, 0, sizeof(c)); @@ -951,7 +1097,7 @@ static int adapter_alloc_sq(struct nvme_dev *dev, u16 qid, int flags = NVME_QUEUE_PHYS_CONTIG; /* - * Note: we (ab)use the fact the the prp fields survive if no data + * Note: we (ab)use the fact that the prp fields survive if no data * is attached to the request. */ memset(&c, 0, sizeof(c)); @@ -1372,14 +1518,10 @@ static int nvme_alloc_admin_tags(struct nvme_dev *dev) dev->admin_tagset.ops = &nvme_mq_admin_ops; dev->admin_tagset.nr_hw_queues = 1; - /* - * Subtract one to leave an empty queue entry for 'Full Queue' - * condition. See NVM-Express 1.2 specification, section 4.1.2. - */ - dev->admin_tagset.queue_depth = NVME_AQ_BLKMQ_DEPTH - 1; + dev->admin_tagset.queue_depth = NVME_AQ_MQ_TAG_DEPTH; dev->admin_tagset.timeout = ADMIN_TIMEOUT; dev->admin_tagset.numa_node = dev_to_node(dev->dev); - dev->admin_tagset.cmd_size = nvme_cmd_size(dev); + dev->admin_tagset.cmd_size = nvme_pci_cmd_size(dev, false); dev->admin_tagset.flags = BLK_MQ_F_NO_SCHED; dev->admin_tagset.driver_data = dev; @@ -1906,7 +2048,11 @@ static int nvme_dev_add(struct nvme_dev *dev) dev->tagset.numa_node = dev_to_node(dev->dev); dev->tagset.queue_depth = min_t(int, dev->q_depth, BLK_MQ_MAX_DEPTH) - 1; - dev->tagset.cmd_size = nvme_cmd_size(dev); + dev->tagset.cmd_size = nvme_pci_cmd_size(dev, false); + if ((dev->ctrl.sgls & ((1 << 0) | (1 << 1))) && sgl_threshold) { + dev->tagset.cmd_size = max(dev->tagset.cmd_size, + nvme_pci_cmd_size(dev, true)); + } dev->tagset.flags = BLK_MQ_F_SHOULD_MERGE; dev->tagset.driver_data = dev; @@ -2132,9 +2278,9 @@ static void nvme_remove_dead_ctrl(struct nvme_dev *dev, int status) { dev_warn(dev->ctrl.device, "Removing after probe failure status: %d\n", status); - kref_get(&dev->ctrl.kref); + nvme_get_ctrl(&dev->ctrl); nvme_dev_disable(dev, false); - if (!schedule_work(&dev->remove_work)) + if (!queue_work(nvme_wq, &dev->remove_work)) nvme_put_ctrl(&dev->ctrl); } @@ -2557,6 +2703,7 @@ static int __init nvme_init(void) static void __exit nvme_exit(void) { pci_unregister_driver(&nvme_driver); + flush_workqueue(nvme_wq); _nvme_check_size(); } diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c index 0ebb539..4f9bf2f 100644 --- a/drivers/nvme/host/rdma.c +++ b/drivers/nvme/host/rdma.c @@ -41,17 +41,9 @@ #define NVME_RDMA_MAX_INLINE_SEGMENTS 1 -/* - * We handle AEN commands ourselves and don't even let the - * block layer know about them. - */ -#define NVME_RDMA_NR_AEN_COMMANDS 1 -#define NVME_RDMA_AQ_BLKMQ_DEPTH \ - (NVME_AQ_DEPTH - NVME_RDMA_NR_AEN_COMMANDS) - struct nvme_rdma_device { - struct ib_device *dev; - struct ib_pd *pd; + struct ib_device *dev; + struct ib_pd *pd; struct kref ref; struct list_head entry; }; @@ -79,8 +71,8 @@ struct nvme_rdma_request { }; enum nvme_rdma_queue_flags { - NVME_RDMA_Q_LIVE = 0, - NVME_RDMA_Q_DELETING = 1, + NVME_RDMA_Q_ALLOCATED = 0, + NVME_RDMA_Q_LIVE = 1, }; struct nvme_rdma_queue { @@ -105,7 +97,6 @@ struct nvme_rdma_ctrl { /* other member variables */ struct blk_mq_tag_set tag_set; - struct work_struct delete_work; struct work_struct err_work; struct nvme_rdma_qe async_event_sqe; @@ -274,6 +265,9 @@ static int nvme_rdma_reinit_request(void *data, struct request *rq) struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq); int ret = 0; + if (WARN_ON_ONCE(!req->mr)) + return 0; + ib_dereg_mr(req->mr); req->mr = ib_alloc_mr(dev->pd, IB_MR_TYPE_MEM_REG, @@ -434,11 +428,9 @@ out_err: static void nvme_rdma_destroy_queue_ib(struct nvme_rdma_queue *queue) { - struct nvme_rdma_device *dev; - struct ib_device *ibdev; + struct nvme_rdma_device *dev = queue->device; + struct ib_device *ibdev = dev->dev; - dev = queue->device; - ibdev = dev->dev; rdma_destroy_qp(queue->cm_id); ib_free_cq(queue->ib_cq); @@ -493,7 +485,7 @@ static int nvme_rdma_create_queue_ib(struct nvme_rdma_queue *queue) return 0; out_destroy_qp: - ib_destroy_qp(queue->qp); + rdma_destroy_qp(queue->cm_id); out_destroy_ib_cq: ib_free_cq(queue->ib_cq); out_put_dev: @@ -544,11 +536,11 @@ static int nvme_rdma_alloc_queue(struct nvme_rdma_ctrl *ctrl, ret = nvme_rdma_wait_for_cm(queue); if (ret) { dev_info(ctrl->ctrl.device, - "rdma_resolve_addr wait failed (%d).\n", ret); + "rdma connection establishment failed (%d)\n", ret); goto out_destroy_cm_id; } - clear_bit(NVME_RDMA_Q_DELETING, &queue->flags); + set_bit(NVME_RDMA_Q_ALLOCATED, &queue->flags); return 0; @@ -568,7 +560,7 @@ static void nvme_rdma_stop_queue(struct nvme_rdma_queue *queue) static void nvme_rdma_free_queue(struct nvme_rdma_queue *queue) { - if (test_and_set_bit(NVME_RDMA_Q_DELETING, &queue->flags)) + if (!test_and_clear_bit(NVME_RDMA_Q_ALLOCATED, &queue->flags)) return; if (nvme_rdma_queue_idx(queue) == 0) { @@ -676,11 +668,10 @@ out_free_queues: return ret; } -static void nvme_rdma_free_tagset(struct nvme_ctrl *nctrl, bool admin) +static void nvme_rdma_free_tagset(struct nvme_ctrl *nctrl, + struct blk_mq_tag_set *set) { struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl); - struct blk_mq_tag_set *set = admin ? - &ctrl->admin_tag_set : &ctrl->tag_set; blk_mq_free_tag_set(set); nvme_rdma_dev_put(ctrl->device); @@ -697,7 +688,7 @@ static struct blk_mq_tag_set *nvme_rdma_alloc_tagset(struct nvme_ctrl *nctrl, set = &ctrl->admin_tag_set; memset(set, 0, sizeof(*set)); set->ops = &nvme_rdma_admin_mq_ops; - set->queue_depth = NVME_RDMA_AQ_BLKMQ_DEPTH; + set->queue_depth = NVME_AQ_MQ_TAG_DEPTH; set->reserved_tags = 2; /* connect + keep-alive */ set->numa_node = NUMA_NO_NODE; set->cmd_size = sizeof(struct nvme_rdma_request) + @@ -705,6 +696,7 @@ static struct blk_mq_tag_set *nvme_rdma_alloc_tagset(struct nvme_ctrl *nctrl, set->driver_data = ctrl; set->nr_hw_queues = 1; set->timeout = ADMIN_TIMEOUT; + set->flags = BLK_MQ_F_NO_SCHED; } else { set = &ctrl->tag_set; memset(set, 0, sizeof(*set)); @@ -748,7 +740,7 @@ static void nvme_rdma_destroy_admin_queue(struct nvme_rdma_ctrl *ctrl, nvme_rdma_stop_queue(&ctrl->queues[0]); if (remove) { blk_cleanup_queue(ctrl->ctrl.admin_q); - nvme_rdma_free_tagset(&ctrl->ctrl, true); + nvme_rdma_free_tagset(&ctrl->ctrl, ctrl->ctrl.admin_tagset); } nvme_rdma_free_queue(&ctrl->queues[0]); } @@ -780,8 +772,7 @@ static int nvme_rdma_configure_admin_queue(struct nvme_rdma_ctrl *ctrl, goto out_free_tagset; } } else { - error = blk_mq_reinit_tagset(&ctrl->admin_tag_set, - nvme_rdma_reinit_request); + error = nvme_reinit_tagset(&ctrl->ctrl, ctrl->ctrl.admin_tagset); if (error) goto out_free_queue; } @@ -825,7 +816,7 @@ out_cleanup_queue: blk_cleanup_queue(ctrl->ctrl.admin_q); out_free_tagset: if (new) - nvme_rdma_free_tagset(&ctrl->ctrl, true); + nvme_rdma_free_tagset(&ctrl->ctrl, ctrl->ctrl.admin_tagset); out_free_queue: nvme_rdma_free_queue(&ctrl->queues[0]); return error; @@ -837,7 +828,7 @@ static void nvme_rdma_destroy_io_queues(struct nvme_rdma_ctrl *ctrl, nvme_rdma_stop_io_queues(ctrl); if (remove) { blk_cleanup_queue(ctrl->ctrl.connect_q); - nvme_rdma_free_tagset(&ctrl->ctrl, false); + nvme_rdma_free_tagset(&ctrl->ctrl, ctrl->ctrl.tagset); } nvme_rdma_free_io_queues(ctrl); } @@ -863,8 +854,7 @@ static int nvme_rdma_configure_io_queues(struct nvme_rdma_ctrl *ctrl, bool new) goto out_free_tag_set; } } else { - ret = blk_mq_reinit_tagset(&ctrl->tag_set, - nvme_rdma_reinit_request); + ret = nvme_reinit_tagset(&ctrl->ctrl, ctrl->ctrl.tagset); if (ret) goto out_free_io_queues; @@ -883,7 +873,7 @@ out_cleanup_connect_q: blk_cleanup_queue(ctrl->ctrl.connect_q); out_free_tag_set: if (new) - nvme_rdma_free_tagset(&ctrl->ctrl, false); + nvme_rdma_free_tagset(&ctrl->ctrl, ctrl->ctrl.tagset); out_free_io_queues: nvme_rdma_free_io_queues(ctrl); return ret; @@ -922,7 +912,7 @@ static void nvme_rdma_reconnect_or_remove(struct nvme_rdma_ctrl *ctrl) ctrl->ctrl.opts->reconnect_delay * HZ); } else { dev_info(ctrl->ctrl.device, "Removing controller...\n"); - queue_work(nvme_wq, &ctrl->delete_work); + nvme_delete_ctrl(&ctrl->ctrl); } } @@ -935,10 +925,6 @@ static void nvme_rdma_reconnect_ctrl_work(struct work_struct *work) ++ctrl->ctrl.nr_reconnects; - if (ctrl->ctrl.queue_count > 1) - nvme_rdma_destroy_io_queues(ctrl, false); - - nvme_rdma_destroy_admin_queue(ctrl, false); ret = nvme_rdma_configure_admin_queue(ctrl, false); if (ret) goto requeue; @@ -946,7 +932,7 @@ static void nvme_rdma_reconnect_ctrl_work(struct work_struct *work) if (ctrl->ctrl.queue_count > 1) { ret = nvme_rdma_configure_io_queues(ctrl, false); if (ret) - goto requeue; + goto destroy_admin; } changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); @@ -956,14 +942,17 @@ static void nvme_rdma_reconnect_ctrl_work(struct work_struct *work) return; } - ctrl->ctrl.nr_reconnects = 0; - nvme_start_ctrl(&ctrl->ctrl); - dev_info(ctrl->ctrl.device, "Successfully reconnected\n"); + dev_info(ctrl->ctrl.device, "Successfully reconnected (%d attempts)\n", + ctrl->ctrl.nr_reconnects); + + ctrl->ctrl.nr_reconnects = 0; return; +destroy_admin: + nvme_rdma_destroy_admin_queue(ctrl, false); requeue: dev_info(ctrl->ctrl.device, "Failed reconnect attempt %d\n", ctrl->ctrl.nr_reconnects); @@ -979,17 +968,15 @@ static void nvme_rdma_error_recovery_work(struct work_struct *work) if (ctrl->ctrl.queue_count > 1) { nvme_stop_queues(&ctrl->ctrl); - nvme_rdma_stop_io_queues(ctrl); - } - blk_mq_quiesce_queue(ctrl->ctrl.admin_q); - nvme_rdma_stop_queue(&ctrl->queues[0]); - - /* We must take care of fastfail/requeue all our inflight requests */ - if (ctrl->ctrl.queue_count > 1) blk_mq_tagset_busy_iter(&ctrl->tag_set, nvme_cancel_request, &ctrl->ctrl); + nvme_rdma_destroy_io_queues(ctrl, false); + } + + blk_mq_quiesce_queue(ctrl->ctrl.admin_q); blk_mq_tagset_busy_iter(&ctrl->admin_tag_set, nvme_cancel_request, &ctrl->ctrl); + nvme_rdma_destroy_admin_queue(ctrl, false); /* * queues are not a live anymore, so restart the queues to fail fast @@ -1065,7 +1052,7 @@ static void nvme_rdma_unmap_data(struct nvme_rdma_queue *queue, if (!blk_rq_bytes(rq)) return; - if (req->mr->need_inval) { + if (req->mr->need_inval && test_bit(NVME_RDMA_Q_LIVE, &req->queue->flags)) { res = nvme_rdma_inv_rkey(queue, req); if (unlikely(res < 0)) { dev_err(ctrl->ctrl.device, @@ -1314,7 +1301,7 @@ static struct blk_mq_tags *nvme_rdma_tagset(struct nvme_rdma_queue *queue) return queue->ctrl->tag_set.tags[queue_idx - 1]; } -static void nvme_rdma_submit_async_event(struct nvme_ctrl *arg, int aer_idx) +static void nvme_rdma_submit_async_event(struct nvme_ctrl *arg) { struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(arg); struct nvme_rdma_queue *queue = &ctrl->queues[0]; @@ -1324,14 +1311,11 @@ static void nvme_rdma_submit_async_event(struct nvme_ctrl *arg, int aer_idx) struct ib_sge sge; int ret; - if (WARN_ON_ONCE(aer_idx != 0)) - return; - ib_dma_sync_single_for_cpu(dev, sqe->dma, sizeof(*cmd), DMA_TO_DEVICE); memset(cmd, 0, sizeof(*cmd)); cmd->common.opcode = nvme_admin_async_event; - cmd->common.command_id = NVME_RDMA_AQ_BLKMQ_DEPTH; + cmd->common.command_id = NVME_AQ_BLK_MQ_DEPTH; cmd->common.flags |= NVME_CMD_SGL_METABUF; nvme_rdma_set_sg_null(cmd); @@ -1393,7 +1377,7 @@ static int __nvme_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc, int tag) * for them but rather special case them here. */ if (unlikely(nvme_rdma_queue_idx(queue) == 0 && - cqe->command_id >= NVME_RDMA_AQ_BLKMQ_DEPTH)) + cqe->command_id >= NVME_AQ_BLK_MQ_DEPTH)) nvme_complete_async_event(&queue->ctrl->ctrl, cqe->status, &cqe->result); else @@ -1590,6 +1574,10 @@ nvme_rdma_timeout(struct request *rq, bool reserved) { struct nvme_rdma_request *req = blk_mq_rq_to_pdu(rq); + dev_warn(req->queue->ctrl->ctrl.device, + "I/O %d QID %d timeout, reset controller\n", + rq->tag, nvme_rdma_queue_idx(req->queue)); + /* queue error recovery */ nvme_rdma_error_recovery(req->queue->ctrl); @@ -1767,50 +1755,9 @@ static void nvme_rdma_shutdown_ctrl(struct nvme_rdma_ctrl *ctrl, bool shutdown) nvme_rdma_destroy_admin_queue(ctrl, shutdown); } -static void nvme_rdma_remove_ctrl(struct nvme_rdma_ctrl *ctrl) +static void nvme_rdma_delete_ctrl(struct nvme_ctrl *ctrl) { - nvme_remove_namespaces(&ctrl->ctrl); - nvme_rdma_shutdown_ctrl(ctrl, true); - nvme_uninit_ctrl(&ctrl->ctrl); - nvme_put_ctrl(&ctrl->ctrl); -} - -static void nvme_rdma_del_ctrl_work(struct work_struct *work) -{ - struct nvme_rdma_ctrl *ctrl = container_of(work, - struct nvme_rdma_ctrl, delete_work); - - nvme_stop_ctrl(&ctrl->ctrl); - nvme_rdma_remove_ctrl(ctrl); -} - -static int __nvme_rdma_del_ctrl(struct nvme_rdma_ctrl *ctrl) -{ - if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_DELETING)) - return -EBUSY; - - if (!queue_work(nvme_wq, &ctrl->delete_work)) - return -EBUSY; - - return 0; -} - -static int nvme_rdma_del_ctrl(struct nvme_ctrl *nctrl) -{ - struct nvme_rdma_ctrl *ctrl = to_rdma_ctrl(nctrl); - int ret = 0; - - /* - * Keep a reference until all work is flushed since - * __nvme_rdma_del_ctrl can free the ctrl mem - */ - if (!kref_get_unless_zero(&ctrl->ctrl.kref)) - return -EBUSY; - ret = __nvme_rdma_del_ctrl(ctrl); - if (!ret) - flush_work(&ctrl->delete_work); - nvme_put_ctrl(&ctrl->ctrl); - return ret; + nvme_rdma_shutdown_ctrl(to_rdma_ctrl(ctrl), true); } static void nvme_rdma_reset_ctrl_work(struct work_struct *work) @@ -1834,7 +1781,11 @@ static void nvme_rdma_reset_ctrl_work(struct work_struct *work) } changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); - WARN_ON_ONCE(!changed); + if (!changed) { + /* state change failure is ok if we're in DELETING state */ + WARN_ON_ONCE(ctrl->ctrl.state != NVME_CTRL_DELETING); + return; + } nvme_start_ctrl(&ctrl->ctrl); @@ -1842,7 +1793,10 @@ static void nvme_rdma_reset_ctrl_work(struct work_struct *work) out_fail: dev_warn(ctrl->ctrl.device, "Removing after reset failure\n"); - nvme_rdma_remove_ctrl(ctrl); + nvme_remove_namespaces(&ctrl->ctrl); + nvme_rdma_shutdown_ctrl(ctrl, true); + nvme_uninit_ctrl(&ctrl->ctrl); + nvme_put_ctrl(&ctrl->ctrl); } static const struct nvme_ctrl_ops nvme_rdma_ctrl_ops = { @@ -1854,10 +1808,88 @@ static const struct nvme_ctrl_ops nvme_rdma_ctrl_ops = { .reg_write32 = nvmf_reg_write32, .free_ctrl = nvme_rdma_free_ctrl, .submit_async_event = nvme_rdma_submit_async_event, - .delete_ctrl = nvme_rdma_del_ctrl, + .delete_ctrl = nvme_rdma_delete_ctrl, .get_address = nvmf_get_address, + .reinit_request = nvme_rdma_reinit_request, }; +static inline bool +__nvme_rdma_options_match(struct nvme_rdma_ctrl *ctrl, + struct nvmf_ctrl_options *opts) +{ + char *stdport = __stringify(NVME_RDMA_IP_PORT); + + + if (!nvmf_ctlr_matches_baseopts(&ctrl->ctrl, opts) || + strcmp(opts->traddr, ctrl->ctrl.opts->traddr)) + return false; + + if (opts->mask & NVMF_OPT_TRSVCID && + ctrl->ctrl.opts->mask & NVMF_OPT_TRSVCID) { + if (strcmp(opts->trsvcid, ctrl->ctrl.opts->trsvcid)) + return false; + } else if (opts->mask & NVMF_OPT_TRSVCID) { + if (strcmp(opts->trsvcid, stdport)) + return false; + } else if (ctrl->ctrl.opts->mask & NVMF_OPT_TRSVCID) { + if (strcmp(stdport, ctrl->ctrl.opts->trsvcid)) + return false; + } + /* else, it's a match as both have stdport. Fall to next checks */ + + /* + * checking the local address is rough. In most cases, one + * is not specified and the host port is selected by the stack. + * + * Assume no match if: + * local address is specified and address is not the same + * local address is not specified but remote is, or vice versa + * (admin using specific host_traddr when it matters). + */ + if (opts->mask & NVMF_OPT_HOST_TRADDR && + ctrl->ctrl.opts->mask & NVMF_OPT_HOST_TRADDR) { + if (strcmp(opts->host_traddr, ctrl->ctrl.opts->host_traddr)) + return false; + } else if (opts->mask & NVMF_OPT_HOST_TRADDR || + ctrl->ctrl.opts->mask & NVMF_OPT_HOST_TRADDR) + return false; + /* + * if neither controller had an host port specified, assume it's + * a match as everything else matched. + */ + + return true; +} + +/* + * Fails a connection request if it matches an existing controller + * (association) with the same tuple: + * <Host NQN, Host ID, local address, remote address, remote port, SUBSYS NQN> + * + * if local address is not specified in the request, it will match an + * existing controller with all the other parameters the same and no + * local port address specified as well. + * + * The ports don't need to be compared as they are intrinsically + * already matched by the port pointers supplied. + */ +static bool +nvme_rdma_existing_controller(struct nvmf_ctrl_options *opts) +{ + struct nvme_rdma_ctrl *ctrl; + bool found = false; + + mutex_lock(&nvme_rdma_ctrl_mutex); + list_for_each_entry(ctrl, &nvme_rdma_ctrl_list, list) { + found = __nvme_rdma_options_match(ctrl, opts); + if (found) + break; + } + mutex_unlock(&nvme_rdma_ctrl_mutex); + + return found; +} + static struct nvme_ctrl *nvme_rdma_create_ctrl(struct device *dev, struct nvmf_ctrl_options *opts) { @@ -1894,6 +1926,11 @@ static struct nvme_ctrl *nvme_rdma_create_ctrl(struct device *dev, } } + if (!opts->duplicate_connect && nvme_rdma_existing_controller(opts)) { + ret = -EALREADY; + goto out_free_ctrl; + } + ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_rdma_ctrl_ops, 0 /* no quirks, we're perfect! */); if (ret) @@ -1902,7 +1939,6 @@ static struct nvme_ctrl *nvme_rdma_create_ctrl(struct device *dev, INIT_DELAYED_WORK(&ctrl->reconnect_work, nvme_rdma_reconnect_ctrl_work); INIT_WORK(&ctrl->err_work, nvme_rdma_error_recovery_work); - INIT_WORK(&ctrl->delete_work, nvme_rdma_del_ctrl_work); INIT_WORK(&ctrl->ctrl.reset_work, nvme_rdma_reset_ctrl_work); ctrl->ctrl.queue_count = opts->nr_io_queues + 1; /* +1 for admin queue */ @@ -1961,7 +1997,7 @@ static struct nvme_ctrl *nvme_rdma_create_ctrl(struct device *dev, dev_info(ctrl->ctrl.device, "new ctrl: NQN \"%s\", addr %pISpcs\n", ctrl->ctrl.opts->subsysnqn, &ctrl->addr); - kref_get(&ctrl->ctrl.kref); + nvme_get_ctrl(&ctrl->ctrl); mutex_lock(&nvme_rdma_ctrl_mutex); list_add_tail(&ctrl->list, &nvme_rdma_ctrl_list); @@ -2006,7 +2042,7 @@ static void nvme_rdma_remove_one(struct ib_device *ib_device, void *client_data) dev_info(ctrl->ctrl.device, "Removing ctrl: NQN \"%s\", addr %pISp\n", ctrl->ctrl.opts->subsysnqn, &ctrl->addr); - __nvme_rdma_del_ctrl(ctrl); + nvme_delete_ctrl(&ctrl->ctrl); } mutex_unlock(&nvme_rdma_ctrl_mutex); diff --git a/drivers/nvme/target/admin-cmd.c b/drivers/nvme/target/admin-cmd.c index c4a0bf3..90dcdc4 100644 --- a/drivers/nvme/target/admin-cmd.c +++ b/drivers/nvme/target/admin-cmd.c @@ -35,17 +35,14 @@ u32 nvmet_get_log_page_len(struct nvme_command *cmd) static u16 nvmet_get_smart_log_nsid(struct nvmet_req *req, struct nvme_smart_log *slog) { - u16 status; struct nvmet_ns *ns; u64 host_reads, host_writes, data_units_read, data_units_written; - status = NVME_SC_SUCCESS; ns = nvmet_find_namespace(req->sq->ctrl, req->cmd->get_log_page.nsid); if (!ns) { - status = NVME_SC_INVALID_NS; pr_err("nvmet : Could not find namespace id : %d\n", le32_to_cpu(req->cmd->get_log_page.nsid)); - goto out; + return NVME_SC_INVALID_NS; } host_reads = part_stat_read(ns->bdev->bd_part, ios[READ]); @@ -58,20 +55,18 @@ static u16 nvmet_get_smart_log_nsid(struct nvmet_req *req, put_unaligned_le64(host_writes, &slog->host_writes[0]); put_unaligned_le64(data_units_written, &slog->data_units_written[0]); nvmet_put_namespace(ns); -out: - return status; + + return NVME_SC_SUCCESS; } static u16 nvmet_get_smart_log_all(struct nvmet_req *req, struct nvme_smart_log *slog) { - u16 status; u64 host_reads = 0, host_writes = 0; u64 data_units_read = 0, data_units_written = 0; struct nvmet_ns *ns; struct nvmet_ctrl *ctrl; - status = NVME_SC_SUCCESS; ctrl = req->sq->ctrl; rcu_read_lock(); @@ -91,7 +86,7 @@ static u16 nvmet_get_smart_log_all(struct nvmet_req *req, put_unaligned_le64(host_writes, &slog->host_writes[0]); put_unaligned_le64(data_units_written, &slog->data_units_written[0]); - return status; + return NVME_SC_SUCCESS; } static u16 nvmet_get_smart_log(struct nvmet_req *req, @@ -144,10 +139,8 @@ static void nvmet_execute_get_log_page(struct nvmet_req *req) } smart_log = buf; status = nvmet_get_smart_log(req, smart_log); - if (status) { - memset(buf, '\0', data_len); + if (status) goto err; - } break; case NVME_LOG_FW_SLOT: /* @@ -300,7 +293,7 @@ static void nvmet_execute_identify_ns(struct nvmet_req *req) } /* - * nuse = ncap = nsze isn't aways true, but we have no way to find + * nuse = ncap = nsze isn't always true, but we have no way to find * that out from the underlying device. */ id->ncap = id->nuse = id->nsze = @@ -424,7 +417,7 @@ out: } /* - * A "mimimum viable" abort implementation: the command is mandatory in the + * A "minimum viable" abort implementation: the command is mandatory in the * spec, but we are not required to do any useful work. We couldn't really * do a useful abort, so don't bother even with waiting for the command * to be exectuted and return immediately telling the command to abort diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c index 645ba7e..b54748a 100644 --- a/drivers/nvme/target/core.c +++ b/drivers/nvme/target/core.c @@ -57,6 +57,17 @@ u16 nvmet_copy_from_sgl(struct nvmet_req *req, off_t off, void *buf, size_t len) return 0; } +static unsigned int nvmet_max_nsid(struct nvmet_subsys *subsys) +{ + struct nvmet_ns *ns; + + if (list_empty(&subsys->namespaces)) + return 0; + + ns = list_last_entry(&subsys->namespaces, struct nvmet_ns, dev_link); + return ns->nsid; +} + static u32 nvmet_async_event_result(struct nvmet_async_event *aen) { return aen->event_type | (aen->event_info << 8) | (aen->log_page << 16); @@ -334,6 +345,8 @@ void nvmet_ns_disable(struct nvmet_ns *ns) ns->enabled = false; list_del_rcu(&ns->dev_link); + if (ns->nsid == subsys->max_nsid) + subsys->max_nsid = nvmet_max_nsid(subsys); mutex_unlock(&subsys->lock); /* @@ -497,6 +510,7 @@ bool nvmet_req_init(struct nvmet_req *req, struct nvmet_cq *cq, req->ops = ops; req->sg = NULL; req->sg_cnt = 0; + req->transfer_len = 0; req->rsp->status = 0; /* no support for fused commands yet */ @@ -546,6 +560,15 @@ void nvmet_req_uninit(struct nvmet_req *req) } EXPORT_SYMBOL_GPL(nvmet_req_uninit); +void nvmet_req_execute(struct nvmet_req *req) +{ + if (unlikely(req->data_len != req->transfer_len)) + nvmet_req_complete(req, NVME_SC_SGL_INVALID_DATA | NVME_SC_DNR); + else + req->execute(req); +} +EXPORT_SYMBOL_GPL(nvmet_req_execute); + static inline bool nvmet_cc_en(u32 cc) { return (cc >> NVME_CC_EN_SHIFT) & 0x1; diff --git a/drivers/nvme/target/fc.c b/drivers/nvme/target/fc.c index 58e010b..739b8fe 100644 --- a/drivers/nvme/target/fc.c +++ b/drivers/nvme/target/fc.c @@ -76,7 +76,6 @@ struct nvmet_fc_fcp_iod { dma_addr_t rspdma; struct scatterlist *data_sg; int data_sg_cnt; - u32 total_length; u32 offset; enum nvmet_fcp_datadir io_dir; bool active; @@ -150,6 +149,7 @@ struct nvmet_fc_tgt_assoc { struct list_head a_list; struct nvmet_fc_tgt_queue *queues[NVMET_NR_QUEUES + 1]; struct kref ref; + struct work_struct del_work; }; @@ -232,6 +232,7 @@ static void nvmet_fc_tgtport_put(struct nvmet_fc_tgtport *tgtport); static int nvmet_fc_tgtport_get(struct nvmet_fc_tgtport *tgtport); static void nvmet_fc_handle_fcp_rqst(struct nvmet_fc_tgtport *tgtport, struct nvmet_fc_fcp_iod *fod); +static void nvmet_fc_delete_target_assoc(struct nvmet_fc_tgt_assoc *assoc); /* *********************** FC-NVME DMA Handling **************************** */ @@ -802,6 +803,16 @@ nvmet_fc_find_target_queue(struct nvmet_fc_tgtport *tgtport, return NULL; } +static void +nvmet_fc_delete_assoc(struct work_struct *work) +{ + struct nvmet_fc_tgt_assoc *assoc = + container_of(work, struct nvmet_fc_tgt_assoc, del_work); + + nvmet_fc_delete_target_assoc(assoc); + nvmet_fc_tgt_a_put(assoc); +} + static struct nvmet_fc_tgt_assoc * nvmet_fc_alloc_target_assoc(struct nvmet_fc_tgtport *tgtport) { @@ -826,6 +837,7 @@ nvmet_fc_alloc_target_assoc(struct nvmet_fc_tgtport *tgtport) assoc->a_id = idx; INIT_LIST_HEAD(&assoc->a_list); kref_init(&assoc->ref); + INIT_WORK(&assoc->del_work, nvmet_fc_delete_assoc); while (needrandom) { get_random_bytes(&ran, sizeof(ran) - BYTES_FOR_QID); @@ -1118,8 +1130,7 @@ nvmet_fc_delete_ctrl(struct nvmet_ctrl *ctrl) nvmet_fc_tgtport_put(tgtport); if (found_ctrl) { - nvmet_fc_delete_target_assoc(assoc); - nvmet_fc_tgt_a_put(assoc); + schedule_work(&assoc->del_work); return; } @@ -1688,7 +1699,7 @@ nvmet_fc_alloc_tgt_pgs(struct nvmet_fc_fcp_iod *fod) u32 page_len, length; int i = 0; - length = fod->total_length; + length = fod->req.transfer_len; nent = DIV_ROUND_UP(length, PAGE_SIZE); sg = kmalloc_array(nent, sizeof(struct scatterlist), GFP_KERNEL); if (!sg) @@ -1777,7 +1788,7 @@ nvmet_fc_prep_fcp_rsp(struct nvmet_fc_tgtport *tgtport, u32 rsn, rspcnt, xfr_length; if (fod->fcpreq->op == NVMET_FCOP_READDATA_RSP) - xfr_length = fod->total_length; + xfr_length = fod->req.transfer_len; else xfr_length = fod->offset; @@ -1803,7 +1814,7 @@ nvmet_fc_prep_fcp_rsp(struct nvmet_fc_tgtport *tgtport, rspcnt = atomic_inc_return(&fod->queue->zrspcnt); if (!(rspcnt % fod->queue->ersp_ratio) || sqe->opcode == nvme_fabrics_command || - xfr_length != fod->total_length || + xfr_length != fod->req.transfer_len || (le16_to_cpu(cqe->status) & 0xFFFE) || cqewd[0] || cqewd[1] || (sqe->flags & (NVME_CMD_FUSE_FIRST | NVME_CMD_FUSE_SECOND)) || queue_90percent_full(fod->queue, le16_to_cpu(cqe->sq_head))) @@ -1880,7 +1891,7 @@ nvmet_fc_transfer_fcp_data(struct nvmet_fc_tgtport *tgtport, fcpreq->timeout = NVME_FC_TGTOP_TIMEOUT_SEC; tlen = min_t(u32, tgtport->max_sg_cnt * PAGE_SIZE, - (fod->total_length - fod->offset)); + (fod->req.transfer_len - fod->offset)); fcpreq->transfer_length = tlen; fcpreq->transferred_length = 0; fcpreq->fcp_error = 0; @@ -1894,7 +1905,7 @@ nvmet_fc_transfer_fcp_data(struct nvmet_fc_tgtport *tgtport, * combined xfr with response. */ if ((op == NVMET_FCOP_READDATA) && - ((fod->offset + fcpreq->transfer_length) == fod->total_length) && + ((fod->offset + fcpreq->transfer_length) == fod->req.transfer_len) && (tgtport->ops->target_features & NVMET_FCTGTFEAT_READDATA_RSP)) { fcpreq->op = NVMET_FCOP_READDATA_RSP; nvmet_fc_prep_fcp_rsp(tgtport, fod); @@ -1974,7 +1985,7 @@ nvmet_fc_fod_op_done(struct nvmet_fc_fcp_iod *fod) } fod->offset += fcpreq->transferred_length; - if (fod->offset != fod->total_length) { + if (fod->offset != fod->req.transfer_len) { spin_lock_irqsave(&fod->flock, flags); fod->writedataactive = true; spin_unlock_irqrestore(&fod->flock, flags); @@ -1986,9 +1997,7 @@ nvmet_fc_fod_op_done(struct nvmet_fc_fcp_iod *fod) } /* data transfer complete, resume with nvmet layer */ - - fod->req.execute(&fod->req); - + nvmet_req_execute(&fod->req); break; case NVMET_FCOP_READDATA: @@ -2011,7 +2020,7 @@ nvmet_fc_fod_op_done(struct nvmet_fc_fcp_iod *fod) } fod->offset += fcpreq->transferred_length; - if (fod->offset != fod->total_length) { + if (fod->offset != fod->req.transfer_len) { /* transfer the next chunk */ nvmet_fc_transfer_fcp_data(tgtport, fod, NVMET_FCOP_READDATA); @@ -2148,7 +2157,7 @@ nvmet_fc_handle_fcp_rqst(struct nvmet_fc_tgtport *tgtport, fod->fcpreq->done = nvmet_fc_xmt_fcp_op_done; - fod->total_length = be32_to_cpu(cmdiu->data_len); + fod->req.transfer_len = be32_to_cpu(cmdiu->data_len); if (cmdiu->flags & FCNVME_CMD_FLAGS_WRITE) { fod->io_dir = NVMET_FCP_WRITE; if (!nvme_is_write(&cmdiu->sqe)) @@ -2159,7 +2168,7 @@ nvmet_fc_handle_fcp_rqst(struct nvmet_fc_tgtport *tgtport, goto transport_error; } else { fod->io_dir = NVMET_FCP_NODATA; - if (fod->total_length) + if (fod->req.transfer_len) goto transport_error; } @@ -2167,9 +2176,6 @@ nvmet_fc_handle_fcp_rqst(struct nvmet_fc_tgtport *tgtport, fod->req.rsp = &fod->rspiubuf.cqe; fod->req.port = fod->queue->port; - /* ensure nvmet handlers will set cmd handler callback */ - fod->req.execute = NULL; - /* clear any response payload */ memset(&fod->rspiubuf, 0, sizeof(fod->rspiubuf)); @@ -2189,7 +2195,7 @@ nvmet_fc_handle_fcp_rqst(struct nvmet_fc_tgtport *tgtport, /* keep a running counter of tail position */ atomic_inc(&fod->queue->sqtail); - if (fod->total_length) { + if (fod->req.transfer_len) { ret = nvmet_fc_alloc_tgt_pgs(fod); if (ret) { nvmet_req_complete(&fod->req, ret); @@ -2212,9 +2218,7 @@ nvmet_fc_handle_fcp_rqst(struct nvmet_fc_tgtport *tgtport, * can invoke the nvmet_layer now. If read data, cmd completion will * push the data */ - - fod->req.execute(&fod->req); - + nvmet_req_execute(&fod->req); return; transport_error: diff --git a/drivers/nvme/target/io-cmd.c b/drivers/nvme/target/io-cmd.c index 0d4c23d..0a4372a 100644 --- a/drivers/nvme/target/io-cmd.c +++ b/drivers/nvme/target/io-cmd.c @@ -33,18 +33,11 @@ static inline u32 nvmet_rw_len(struct nvmet_req *req) req->ns->blksize_shift; } -static void nvmet_inline_bio_init(struct nvmet_req *req) -{ - struct bio *bio = &req->inline_bio; - - bio_init(bio, req->inline_bvec, NVMET_MAX_INLINE_BIOVEC); -} - static void nvmet_execute_rw(struct nvmet_req *req) { int sg_cnt = req->sg_cnt; + struct bio *bio = &req->inline_bio; struct scatterlist *sg; - struct bio *bio; sector_t sector; blk_qc_t cookie; int op, op_flags = 0, i; @@ -66,8 +59,7 @@ static void nvmet_execute_rw(struct nvmet_req *req) sector = le64_to_cpu(req->cmd->rw.slba); sector <<= (req->ns->blksize_shift - 9); - nvmet_inline_bio_init(req); - bio = &req->inline_bio; + bio_init(bio, req->inline_bvec, ARRAY_SIZE(req->inline_bvec)); bio_set_dev(bio, req->ns->bdev); bio->bi_iter.bi_sector = sector; bio->bi_private = req; @@ -94,16 +86,14 @@ static void nvmet_execute_rw(struct nvmet_req *req) cookie = submit_bio(bio); - blk_mq_poll(bdev_get_queue(req->ns->bdev), cookie); + blk_poll(bdev_get_queue(req->ns->bdev), cookie); } static void nvmet_execute_flush(struct nvmet_req *req) { - struct bio *bio; - - nvmet_inline_bio_init(req); - bio = &req->inline_bio; + struct bio *bio = &req->inline_bio; + bio_init(bio, req->inline_bvec, ARRAY_SIZE(req->inline_bvec)); bio_set_dev(bio, req->ns->bdev); bio->bi_private = req; bio->bi_end_io = nvmet_bio_done; diff --git a/drivers/nvme/target/loop.c b/drivers/nvme/target/loop.c index 92628c4..96d3904 100644 --- a/drivers/nvme/target/loop.c +++ b/drivers/nvme/target/loop.c @@ -23,14 +23,6 @@ #define NVME_LOOP_MAX_SEGMENTS 256 -/* - * We handle AEN commands ourselves and don't even let the - * block layer know about them. - */ -#define NVME_LOOP_NR_AEN_COMMANDS 1 -#define NVME_LOOP_AQ_BLKMQ_DEPTH \ - (NVME_AQ_DEPTH - NVME_LOOP_NR_AEN_COMMANDS) - struct nvme_loop_iod { struct nvme_request nvme_req; struct nvme_command cmd; @@ -53,7 +45,6 @@ struct nvme_loop_ctrl { struct nvme_ctrl ctrl; struct nvmet_ctrl *target_ctrl; - struct work_struct delete_work; }; static inline struct nvme_loop_ctrl *to_loop_ctrl(struct nvme_ctrl *ctrl) @@ -113,7 +104,7 @@ static void nvme_loop_queue_response(struct nvmet_req *req) * for them but rather special case them here. */ if (unlikely(nvme_loop_queue_idx(queue) == 0 && - cqe->command_id >= NVME_LOOP_AQ_BLKMQ_DEPTH)) { + cqe->command_id >= NVME_AQ_BLK_MQ_DEPTH)) { nvme_complete_async_event(&queue->ctrl->ctrl, cqe->status, &cqe->result); } else { @@ -136,7 +127,7 @@ static void nvme_loop_execute_work(struct work_struct *work) struct nvme_loop_iod *iod = container_of(work, struct nvme_loop_iod, work); - iod->req.execute(&iod->req); + nvmet_req_execute(&iod->req); } static enum blk_eh_timer_return @@ -185,6 +176,7 @@ static blk_status_t nvme_loop_queue_rq(struct blk_mq_hw_ctx *hctx, iod->req.sg = iod->sg_table.sgl; iod->req.sg_cnt = blk_rq_map_sg(req->q, req, iod->sg_table.sgl); + iod->req.transfer_len = blk_rq_bytes(req); } blk_mq_start_request(req); @@ -193,7 +185,7 @@ static blk_status_t nvme_loop_queue_rq(struct blk_mq_hw_ctx *hctx, return BLK_STS_OK; } -static void nvme_loop_submit_async_event(struct nvme_ctrl *arg, int aer_idx) +static void nvme_loop_submit_async_event(struct nvme_ctrl *arg) { struct nvme_loop_ctrl *ctrl = to_loop_ctrl(arg); struct nvme_loop_queue *queue = &ctrl->queues[0]; @@ -201,7 +193,7 @@ static void nvme_loop_submit_async_event(struct nvme_ctrl *arg, int aer_idx) memset(&iod->cmd, 0, sizeof(iod->cmd)); iod->cmd.common.opcode = nvme_admin_async_event; - iod->cmd.common.command_id = NVME_LOOP_AQ_BLKMQ_DEPTH; + iod->cmd.common.command_id = NVME_AQ_BLK_MQ_DEPTH; iod->cmd.common.flags |= NVME_CMD_SGL_METABUF; if (!nvmet_req_init(&iod->req, &queue->nvme_cq, &queue->nvme_sq, @@ -357,7 +349,7 @@ static int nvme_loop_configure_admin_queue(struct nvme_loop_ctrl *ctrl) memset(&ctrl->admin_tag_set, 0, sizeof(ctrl->admin_tag_set)); ctrl->admin_tag_set.ops = &nvme_loop_admin_mq_ops; - ctrl->admin_tag_set.queue_depth = NVME_LOOP_AQ_BLKMQ_DEPTH; + ctrl->admin_tag_set.queue_depth = NVME_AQ_MQ_TAG_DEPTH; ctrl->admin_tag_set.reserved_tags = 2; /* connect + keep-alive */ ctrl->admin_tag_set.numa_node = NUMA_NO_NODE; ctrl->admin_tag_set.cmd_size = sizeof(struct nvme_loop_iod) + @@ -365,6 +357,7 @@ static int nvme_loop_configure_admin_queue(struct nvme_loop_ctrl *ctrl) ctrl->admin_tag_set.driver_data = ctrl; ctrl->admin_tag_set.nr_hw_queues = 1; ctrl->admin_tag_set.timeout = ADMIN_TIMEOUT; + ctrl->admin_tag_set.flags = BLK_MQ_F_NO_SCHED; ctrl->queues[0].ctrl = ctrl; error = nvmet_sq_init(&ctrl->queues[0].nvme_sq); @@ -438,41 +431,9 @@ static void nvme_loop_shutdown_ctrl(struct nvme_loop_ctrl *ctrl) nvme_loop_destroy_admin_queue(ctrl); } -static void nvme_loop_del_ctrl_work(struct work_struct *work) +static void nvme_loop_delete_ctrl_host(struct nvme_ctrl *ctrl) { - struct nvme_loop_ctrl *ctrl = container_of(work, - struct nvme_loop_ctrl, delete_work); - - nvme_stop_ctrl(&ctrl->ctrl); - nvme_remove_namespaces(&ctrl->ctrl); - nvme_loop_shutdown_ctrl(ctrl); - nvme_uninit_ctrl(&ctrl->ctrl); - nvme_put_ctrl(&ctrl->ctrl); -} - -static int __nvme_loop_del_ctrl(struct nvme_loop_ctrl *ctrl) -{ - if (!nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_DELETING)) - return -EBUSY; - - if (!queue_work(nvme_wq, &ctrl->delete_work)) - return -EBUSY; - - return 0; -} - -static int nvme_loop_del_ctrl(struct nvme_ctrl *nctrl) -{ - struct nvme_loop_ctrl *ctrl = to_loop_ctrl(nctrl); - int ret; - - ret = __nvme_loop_del_ctrl(ctrl); - if (ret) - return ret; - - flush_work(&ctrl->delete_work); - - return 0; + nvme_loop_shutdown_ctrl(to_loop_ctrl(ctrl)); } static void nvme_loop_delete_ctrl(struct nvmet_ctrl *nctrl) @@ -482,7 +443,7 @@ static void nvme_loop_delete_ctrl(struct nvmet_ctrl *nctrl) mutex_lock(&nvme_loop_ctrl_mutex); list_for_each_entry(ctrl, &nvme_loop_ctrl_list, list) { if (ctrl->ctrl.cntlid == nctrl->cntlid) - __nvme_loop_del_ctrl(ctrl); + nvme_delete_ctrl(&ctrl->ctrl); } mutex_unlock(&nvme_loop_ctrl_mutex); } @@ -538,7 +499,7 @@ static const struct nvme_ctrl_ops nvme_loop_ctrl_ops = { .reg_write32 = nvmf_reg_write32, .free_ctrl = nvme_loop_free_ctrl, .submit_async_event = nvme_loop_submit_async_event, - .delete_ctrl = nvme_loop_del_ctrl, + .delete_ctrl = nvme_loop_delete_ctrl_host, }; static int nvme_loop_create_io_queues(struct nvme_loop_ctrl *ctrl) @@ -600,7 +561,6 @@ static struct nvme_ctrl *nvme_loop_create_ctrl(struct device *dev, ctrl->ctrl.opts = opts; INIT_LIST_HEAD(&ctrl->list); - INIT_WORK(&ctrl->delete_work, nvme_loop_del_ctrl_work); INIT_WORK(&ctrl->ctrl.reset_work, nvme_loop_reset_ctrl_work); ret = nvme_init_ctrl(&ctrl->ctrl, dev, &nvme_loop_ctrl_ops, @@ -641,7 +601,7 @@ static struct nvme_ctrl *nvme_loop_create_ctrl(struct device *dev, dev_info(ctrl->ctrl.device, "new ctrl: \"%s\"\n", ctrl->ctrl.opts->subsysnqn); - kref_get(&ctrl->ctrl.kref); + nvme_get_ctrl(&ctrl->ctrl); changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE); WARN_ON_ONCE(!changed); @@ -730,7 +690,7 @@ static void __exit nvme_loop_cleanup_module(void) mutex_lock(&nvme_loop_ctrl_mutex); list_for_each_entry_safe(ctrl, next, &nvme_loop_ctrl_list, list) - __nvme_loop_del_ctrl(ctrl); + nvme_delete_ctrl(&ctrl->ctrl); mutex_unlock(&nvme_loop_ctrl_mutex); flush_workqueue(nvme_wq); diff --git a/drivers/nvme/target/nvmet.h b/drivers/nvme/target/nvmet.h index 87e429b..417f6c0 100644 --- a/drivers/nvme/target/nvmet.h +++ b/drivers/nvme/target/nvmet.h @@ -223,7 +223,10 @@ struct nvmet_req { struct bio inline_bio; struct bio_vec inline_bvec[NVMET_MAX_INLINE_BIOVEC]; int sg_cnt; + /* data length as parsed from the command: */ size_t data_len; + /* data length as parsed from the SGL descriptor: */ + size_t transfer_len; struct nvmet_port *port; @@ -266,6 +269,7 @@ u16 nvmet_parse_fabrics_cmd(struct nvmet_req *req); bool nvmet_req_init(struct nvmet_req *req, struct nvmet_cq *cq, struct nvmet_sq *sq, struct nvmet_fabrics_ops *ops); void nvmet_req_uninit(struct nvmet_req *req); +void nvmet_req_execute(struct nvmet_req *req); void nvmet_req_complete(struct nvmet_req *req, u16 status); void nvmet_cq_setup(struct nvmet_ctrl *ctrl, struct nvmet_cq *cq, u16 qid, @@ -314,7 +318,7 @@ u16 nvmet_copy_from_sgl(struct nvmet_req *req, off_t off, void *buf, u32 nvmet_get_log_page_len(struct nvme_command *cmd); #define NVMET_QUEUE_SIZE 1024 -#define NVMET_NR_QUEUES 64 +#define NVMET_NR_QUEUES 128 #define NVMET_MAX_CMD NVMET_QUEUE_SIZE #define NVMET_KAS 10 #define NVMET_DISC_KATO 120 diff --git a/drivers/nvme/target/rdma.c b/drivers/nvme/target/rdma.c index 76d2bb7..4991290 100644 --- a/drivers/nvme/target/rdma.c +++ b/drivers/nvme/target/rdma.c @@ -148,14 +148,14 @@ static inline u32 get_unaligned_le24(const u8 *p) static inline bool nvmet_rdma_need_data_in(struct nvmet_rdma_rsp *rsp) { return nvme_is_write(rsp->req.cmd) && - rsp->req.data_len && + rsp->req.transfer_len && !(rsp->flags & NVMET_RDMA_REQ_INLINE_DATA); } static inline bool nvmet_rdma_need_data_out(struct nvmet_rdma_rsp *rsp) { return !nvme_is_write(rsp->req.cmd) && - rsp->req.data_len && + rsp->req.transfer_len && !rsp->req.rsp->status && !(rsp->flags & NVMET_RDMA_REQ_INLINE_DATA); } @@ -577,7 +577,7 @@ static void nvmet_rdma_read_data_done(struct ib_cq *cq, struct ib_wc *wc) return; } - rsp->req.execute(&rsp->req); + nvmet_req_execute(&rsp->req); } static void nvmet_rdma_use_inline_sg(struct nvmet_rdma_rsp *rsp, u32 len, @@ -609,6 +609,7 @@ static u16 nvmet_rdma_map_sgl_inline(struct nvmet_rdma_rsp *rsp) nvmet_rdma_use_inline_sg(rsp, len, off); rsp->flags |= NVMET_RDMA_REQ_INLINE_DATA; + rsp->req.transfer_len += len; return 0; } @@ -636,6 +637,7 @@ static u16 nvmet_rdma_map_sgl_keyed(struct nvmet_rdma_rsp *rsp, nvmet_data_dir(&rsp->req)); if (ret < 0) return NVME_SC_INTERNAL; + rsp->req.transfer_len += len; rsp->n_rdma += ret; if (invalidate) { @@ -693,7 +695,7 @@ static bool nvmet_rdma_execute_command(struct nvmet_rdma_rsp *rsp) queue->cm_id->port_num, &rsp->read_cqe, NULL)) nvmet_req_complete(&rsp->req, NVME_SC_DATA_XFER_ERROR); } else { - rsp->req.execute(&rsp->req); + nvmet_req_execute(&rsp->req); } return true; @@ -1512,15 +1514,17 @@ static struct nvmet_fabrics_ops nvmet_rdma_ops = { static void nvmet_rdma_remove_one(struct ib_device *ib_device, void *client_data) { - struct nvmet_rdma_queue *queue; + struct nvmet_rdma_queue *queue, *tmp; /* Device is being removed, delete all queues using this device */ mutex_lock(&nvmet_rdma_queue_mutex); - list_for_each_entry(queue, &nvmet_rdma_queue_list, queue_list) { + list_for_each_entry_safe(queue, tmp, &nvmet_rdma_queue_list, + queue_list) { if (queue->dev->device != ib_device) continue; pr_info("Removing queue %d\n", queue->idx); + list_del_init(&queue->queue_list); __nvmet_rdma_queue_disconnect(queue); } mutex_unlock(&nvmet_rdma_queue_mutex); diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig index 4136633..7669553 100644 --- a/drivers/scsi/Kconfig +++ b/drivers/scsi/Kconfig @@ -130,7 +130,8 @@ config CHR_DEV_OSST config BLK_DEV_SR tristate "SCSI CDROM support" - depends on SCSI + depends on SCSI && BLK_DEV + select CDROM ---help--- If you want to use a CD or DVD drive attached to your computer by SCSI, FireWire, USB or ATAPI, say Y and read the SCSI-HOWTO diff --git a/drivers/scsi/lpfc/lpfc_attr.c b/drivers/scsi/lpfc/lpfc_attr.c index c17677f..3e02bc3 100644 --- a/drivers/scsi/lpfc/lpfc_attr.c +++ b/drivers/scsi/lpfc/lpfc_attr.c @@ -3246,6 +3246,11 @@ lpfc_update_rport_devloss_tmo(struct lpfc_vport *vport) continue; if (ndlp->rport) ndlp->rport->dev_loss_tmo = vport->cfg_devloss_tmo; +#if (IS_ENABLED(CONFIG_NVME_FC)) + if (ndlp->nrport) + nvme_fc_set_remoteport_devloss(ndlp->nrport->remoteport, + vport->cfg_devloss_tmo); +#endif } spin_unlock_irq(shost->host_lock); } diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index bcc1694..54de24c 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -252,9 +252,9 @@ int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd, struct scsi_request *rq; int ret = DRIVER_ERROR << 24; - req = blk_get_request(sdev->request_queue, + req = blk_get_request_flags(sdev->request_queue, data_direction == DMA_TO_DEVICE ? - REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, __GFP_RECLAIM); + REQ_OP_SCSI_OUT : REQ_OP_SCSI_IN, BLK_MQ_REQ_PREEMPT); if (IS_ERR(req)) return ret; rq = scsi_req(req); @@ -268,7 +268,7 @@ int scsi_execute(struct scsi_device *sdev, const unsigned char *cmd, rq->retries = retries; req->timeout = timeout; req->cmd_flags |= flags; - req->rq_flags |= rq_flags | RQF_QUIET | RQF_PREEMPT; + req->rq_flags |= rq_flags | RQF_QUIET; /* * head injection *required* here otherwise quiesce won't work @@ -1301,7 +1301,7 @@ scsi_prep_state_check(struct scsi_device *sdev, struct request *req) /* * If the devices is blocked we defer normal commands. */ - if (!(req->rq_flags & RQF_PREEMPT)) + if (req && !(req->rq_flags & RQF_PREEMPT)) ret = BLKPREP_DEFER; break; default: @@ -1310,7 +1310,7 @@ scsi_prep_state_check(struct scsi_device *sdev, struct request *req) * special commands. In particular any user initiated * command is not allowed. */ - if (!(req->rq_flags & RQF_PREEMPT)) + if (req && !(req->rq_flags & RQF_PREEMPT)) ret = BLKPREP_KILL; break; } @@ -1940,6 +1940,33 @@ static void scsi_mq_done(struct scsi_cmnd *cmd) blk_mq_complete_request(cmd->request); } +static void scsi_mq_put_budget(struct blk_mq_hw_ctx *hctx) +{ + struct request_queue *q = hctx->queue; + struct scsi_device *sdev = q->queuedata; + + atomic_dec(&sdev->device_busy); + put_device(&sdev->sdev_gendev); +} + +static bool scsi_mq_get_budget(struct blk_mq_hw_ctx *hctx) +{ + struct request_queue *q = hctx->queue; + struct scsi_device *sdev = q->queuedata; + + if (!get_device(&sdev->sdev_gendev)) + goto out; + if (!scsi_dev_queue_ready(q, sdev)) + goto out_put_device; + + return true; + +out_put_device: + put_device(&sdev->sdev_gendev); +out: + return false; +} + static blk_status_t scsi_queue_rq(struct blk_mq_hw_ctx *hctx, const struct blk_mq_queue_data *bd) { @@ -1953,16 +1980,11 @@ static blk_status_t scsi_queue_rq(struct blk_mq_hw_ctx *hctx, ret = prep_to_mq(scsi_prep_state_check(sdev, req)); if (ret != BLK_STS_OK) - goto out; + goto out_put_budget; ret = BLK_STS_RESOURCE; - if (!get_device(&sdev->sdev_gendev)) - goto out; - - if (!scsi_dev_queue_ready(q, sdev)) - goto out_put_device; if (!scsi_target_queue_ready(shost, sdev)) - goto out_dec_device_busy; + goto out_put_budget; if (!scsi_host_queue_ready(q, shost, sdev)) goto out_dec_target_busy; @@ -1993,15 +2015,12 @@ static blk_status_t scsi_queue_rq(struct blk_mq_hw_ctx *hctx, return BLK_STS_OK; out_dec_host_busy: - atomic_dec(&shost->host_busy); + atomic_dec(&shost->host_busy); out_dec_target_busy: if (scsi_target(sdev)->can_queue > 0) atomic_dec(&scsi_target(sdev)->target_busy); -out_dec_device_busy: - atomic_dec(&sdev->device_busy); -out_put_device: - put_device(&sdev->sdev_gendev); -out: +out_put_budget: + scsi_mq_put_budget(hctx); switch (ret) { case BLK_STS_OK: break; @@ -2205,6 +2224,8 @@ struct request_queue *scsi_old_alloc_queue(struct scsi_device *sdev) } static const struct blk_mq_ops scsi_mq_ops = { + .get_budget = scsi_mq_get_budget, + .put_budget = scsi_mq_put_budget, .queue_rq = scsi_queue_rq, .complete = scsi_softirq_done, .timeout = scsi_timeout, @@ -2919,21 +2940,37 @@ static void scsi_wait_for_queuecommand(struct scsi_device *sdev) int scsi_device_quiesce(struct scsi_device *sdev) { + struct request_queue *q = sdev->request_queue; int err; + /* + * It is allowed to call scsi_device_quiesce() multiple times from + * the same context but concurrent scsi_device_quiesce() calls are + * not allowed. + */ + WARN_ON_ONCE(sdev->quiesced_by && sdev->quiesced_by != current); + + blk_set_preempt_only(q); + + blk_mq_freeze_queue(q); + /* + * Ensure that the effect of blk_set_preempt_only() will be visible + * for percpu_ref_tryget() callers that occur after the queue + * unfreeze even if the queue was already frozen before this function + * was called. See also https://lwn.net/Articles/573497/. + */ + synchronize_rcu(); + blk_mq_unfreeze_queue(q); + mutex_lock(&sdev->state_mutex); err = scsi_device_set_state(sdev, SDEV_QUIESCE); + if (err == 0) + sdev->quiesced_by = current; + else + blk_clear_preempt_only(q); mutex_unlock(&sdev->state_mutex); - if (err) - return err; - - scsi_run_queue(sdev->request_queue); - while (atomic_read(&sdev->device_busy)) { - msleep_interruptible(200); - scsi_run_queue(sdev->request_queue); - } - return 0; + return err; } EXPORT_SYMBOL(scsi_device_quiesce); @@ -2953,9 +2990,11 @@ void scsi_device_resume(struct scsi_device *sdev) * device deleted during suspend) */ mutex_lock(&sdev->state_mutex); - if (sdev->sdev_state == SDEV_QUIESCE && - scsi_device_set_state(sdev, SDEV_RUNNING) == 0) - scsi_run_queue(sdev->request_queue); + WARN_ON_ONCE(!sdev->quiesced_by); + sdev->quiesced_by = NULL; + blk_clear_preempt_only(sdev->request_queue); + if (sdev->sdev_state == SDEV_QUIESCE) + scsi_device_set_state(sdev, SDEV_RUNNING); mutex_unlock(&sdev->state_mutex); } EXPORT_SYMBOL(scsi_device_resume); diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c index aa28874..f098877 100644 --- a/drivers/scsi/sg.c +++ b/drivers/scsi/sg.c @@ -217,7 +217,7 @@ static int sg_allow_access(struct file *filp, unsigned char *cmd) if (sfp->parentdp->device->type == TYPE_SCANNER) return 0; - return blk_verify_command(cmd, filp->f_mode & FMODE_WRITE); + return blk_verify_command(cmd, filp->f_mode); } static int diff --git a/fs/block_dev.c b/fs/block_dev.c index 789f55e..4a181fc 100644 --- a/fs/block_dev.c +++ b/fs/block_dev.c @@ -54,18 +54,6 @@ struct block_device *I_BDEV(struct inode *inode) } EXPORT_SYMBOL(I_BDEV); -void __vfs_msg(struct super_block *sb, const char *prefix, const char *fmt, ...) -{ - struct va_format vaf; - va_list args; - - va_start(args, fmt); - vaf.fmt = fmt; - vaf.va = &args; - printk_ratelimited("%sVFS (%s): %pV\n", prefix, sb->s_id, &vaf); - va_end(args); -} - static void bdev_write_inode(struct block_device *bdev) { struct inode *inode = bdev->bd_inode; @@ -249,7 +237,7 @@ __blkdev_direct_IO_simple(struct kiocb *iocb, struct iov_iter *iter, if (!READ_ONCE(bio.bi_private)) break; if (!(iocb->ki_flags & IOCB_HIPRI) || - !blk_mq_poll(bdev_get_queue(bdev), qc)) + !blk_poll(bdev_get_queue(bdev), qc)) io_schedule(); } __set_current_state(TASK_RUNNING); @@ -414,7 +402,7 @@ __blkdev_direct_IO(struct kiocb *iocb, struct iov_iter *iter, int nr_pages) break; if (!(iocb->ki_flags & IOCB_HIPRI) || - !blk_mq_poll(bdev_get_queue(bdev), qc)) + !blk_poll(bdev_get_queue(bdev), qc)) io_schedule(); } __set_current_state(TASK_RUNNING); @@ -674,7 +662,7 @@ int bdev_read_page(struct block_device *bdev, sector_t sector, if (!ops->rw_page || bdev_get_integrity(bdev)) return result; - result = blk_queue_enter(bdev->bd_queue, false); + result = blk_queue_enter(bdev->bd_queue, 0); if (result) return result; result = ops->rw_page(bdev, sector + get_start_sect(bdev), page, false); @@ -710,7 +698,7 @@ int bdev_write_page(struct block_device *bdev, sector_t sector, if (!ops->rw_page || bdev_get_integrity(bdev)) return -EOPNOTSUPP; - result = blk_queue_enter(bdev->bd_queue, false); + result = blk_queue_enter(bdev->bd_queue, 0); if (result) return result; diff --git a/fs/buffer.c b/fs/buffer.c index 49b7e9b..1c18a22 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -253,27 +253,6 @@ out: } /* - * Kick the writeback threads then try to free up some ZONE_NORMAL memory. - */ -static void free_more_memory(void) -{ - struct zoneref *z; - int nid; - - wakeup_flusher_threads(1024, WB_REASON_FREE_MORE_MEM); - yield(); - - for_each_online_node(nid) { - - z = first_zones_zonelist(node_zonelist(nid, GFP_NOFS), - gfp_zone(GFP_NOFS), NULL); - if (z->zone) - try_to_free_pages(node_zonelist(nid, GFP_NOFS), 0, - GFP_NOFS, NULL); - } -} - -/* * I/O completion handler for block_read_full_page() - pages * which come unlocked at the end of I/O. */ @@ -861,16 +840,19 @@ int remove_inode_buffers(struct inode *inode) * which may not fail from ordinary buffer allocations. */ struct buffer_head *alloc_page_buffers(struct page *page, unsigned long size, - int retry) + bool retry) { struct buffer_head *bh, *head; + gfp_t gfp = GFP_NOFS; long offset; -try_again: + if (retry) + gfp |= __GFP_NOFAIL; + head = NULL; offset = PAGE_SIZE; while ((offset -= size) >= 0) { - bh = alloc_buffer_head(GFP_NOFS); + bh = alloc_buffer_head(gfp); if (!bh) goto no_grow; @@ -896,23 +878,7 @@ no_grow: } while (head); } - /* - * Return failure for non-async IO requests. Async IO requests - * are not allowed to fail, so we have to wait until buffer heads - * become available. But we don't want tasks sleeping with - * partially complete buffers, so all were released above. - */ - if (!retry) - return NULL; - - /* We're _really_ low on memory. Now we just - * wait for old buffer heads to become free due to - * finishing IO. Since this is an async request and - * the reserve list is empty, we're sure there are - * async buffer heads in use. - */ - free_more_memory(); - goto try_again; + return NULL; } EXPORT_SYMBOL_GPL(alloc_page_buffers); @@ -1001,8 +967,6 @@ grow_dev_page(struct block_device *bdev, sector_t block, gfp_mask |= __GFP_NOFAIL; page = find_or_create_page(inode->i_mapping, index, gfp_mask); - if (!page) - return ret; BUG_ON(!PageLocked(page)); @@ -1021,9 +985,7 @@ grow_dev_page(struct block_device *bdev, sector_t block, /* * Allocate some buffers for this page */ - bh = alloc_page_buffers(page, size, 0); - if (!bh) - goto failed; + bh = alloc_page_buffers(page, size, true); /* * Link the page to the buffers and initialise them. Take the @@ -1103,8 +1065,6 @@ __getblk_slow(struct block_device *bdev, sector_t block, ret = grow_buffers(bdev, block, size, gfp); if (ret < 0) return NULL; - if (ret == 0) - free_more_memory(); } } @@ -1575,7 +1535,7 @@ void create_empty_buffers(struct page *page, { struct buffer_head *bh, *head, *tail; - head = alloc_page_buffers(page, blocksize, 1); + head = alloc_page_buffers(page, blocksize, true); bh = head; do { bh->b_state |= b_state; @@ -2639,7 +2599,7 @@ int nobh_write_begin(struct address_space *mapping, * Be careful: the buffer linked list is a NULL terminated one, rather * than the circular one we're used to. */ - head = alloc_page_buffers(page, blocksize, 0); + head = alloc_page_buffers(page, blocksize, false); if (!head) { ret = -ENOMEM; goto out_release; @@ -3056,8 +3016,16 @@ void guard_bio_eod(int op, struct bio *bio) sector_t maxsector; struct bio_vec *bvec = &bio->bi_io_vec[bio->bi_vcnt - 1]; unsigned truncated_bytes; + struct hd_struct *part; + + rcu_read_lock(); + part = __disk_get_part(bio->bi_disk, bio->bi_partno); + if (part) + maxsector = part_nr_sects_read(part); + else + maxsector = get_capacity(bio->bi_disk); + rcu_read_unlock(); - maxsector = get_capacity(bio->bi_disk); if (!maxsector) return; diff --git a/fs/direct-io.c b/fs/direct-io.c index 98fe132..3aafb33 100644 --- a/fs/direct-io.c +++ b/fs/direct-io.c @@ -497,7 +497,7 @@ static struct bio *dio_await_one(struct dio *dio) dio->waiter = current; spin_unlock_irqrestore(&dio->bio_lock, flags); if (!(dio->iocb->ki_flags & IOCB_HIPRI) || - !blk_mq_poll(dio->bio_disk->queue, dio->bio_cookie)) + !blk_poll(dio->bio_disk->queue, dio->bio_cookie)) io_schedule(); /* wake up sets us TASK_RUNNING */ spin_lock_irqsave(&dio->bio_lock, flags); diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c index 245c430..08f5deb 100644 --- a/fs/fs-writeback.c +++ b/fs/fs-writeback.c @@ -933,33 +933,36 @@ static void bdi_split_work_to_wbs(struct backing_dev_info *bdi, #endif /* CONFIG_CGROUP_WRITEBACK */ -void wb_start_writeback(struct bdi_writeback *wb, long nr_pages, - bool range_cyclic, enum wb_reason reason) +/* + * Add in the number of potentially dirty inodes, because each inode + * write can dirty pagecache in the underlying blockdev. + */ +static unsigned long get_nr_dirty_pages(void) { - struct wb_writeback_work *work; + return global_node_page_state(NR_FILE_DIRTY) + + global_node_page_state(NR_UNSTABLE_NFS) + + get_nr_dirty_inodes(); +} +static void wb_start_writeback(struct bdi_writeback *wb, enum wb_reason reason) +{ if (!wb_has_dirty_io(wb)) return; /* - * This is WB_SYNC_NONE writeback, so if allocation fails just - * wakeup the thread for old dirty data writeback + * All callers of this function want to start writeback of all + * dirty pages. Places like vmscan can call this at a very + * high frequency, causing pointless allocations of tons of + * work items and keeping the flusher threads busy retrieving + * that work. Ensure that we only allow one of them pending and + * inflight at the time. */ - work = kzalloc(sizeof(*work), - GFP_NOWAIT | __GFP_NOMEMALLOC | __GFP_NOWARN); - if (!work) { - trace_writeback_nowork(wb); - wb_wakeup(wb); + if (test_bit(WB_start_all, &wb->state) || + test_and_set_bit(WB_start_all, &wb->state)) return; - } - - work->sync_mode = WB_SYNC_NONE; - work->nr_pages = nr_pages; - work->range_cyclic = range_cyclic; - work->reason = reason; - work->auto_free = 1; - wb_queue_work(wb, work); + wb->start_all_reason = reason; + wb_wakeup(wb); } /** @@ -1814,17 +1817,6 @@ static struct wb_writeback_work *get_next_work_item(struct bdi_writeback *wb) return work; } -/* - * Add in the number of potentially dirty inodes, because each inode - * write can dirty pagecache in the underlying blockdev. - */ -static unsigned long get_nr_dirty_pages(void) -{ - return global_node_page_state(NR_FILE_DIRTY) + - global_node_page_state(NR_UNSTABLE_NFS) + - get_nr_dirty_inodes(); -} - static long wb_check_background_flush(struct bdi_writeback *wb) { if (wb_over_bg_thresh(wb)) { @@ -1877,6 +1869,30 @@ static long wb_check_old_data_flush(struct bdi_writeback *wb) return 0; } +static long wb_check_start_all(struct bdi_writeback *wb) +{ + long nr_pages; + + if (!test_bit(WB_start_all, &wb->state)) + return 0; + + nr_pages = get_nr_dirty_pages(); + if (nr_pages) { + struct wb_writeback_work work = { + .nr_pages = wb_split_bdi_pages(wb, nr_pages), + .sync_mode = WB_SYNC_NONE, + .range_cyclic = 1, + .reason = wb->start_all_reason, + }; + + nr_pages = wb_writeback(wb, &work); + } + + clear_bit(WB_start_all, &wb->state); + return nr_pages; +} + + /* * Retrieve work items and do the writeback they describe */ @@ -1893,6 +1909,11 @@ static long wb_do_writeback(struct bdi_writeback *wb) } /* + * Check for a flush-everything request + */ + wrote += wb_check_start_all(wb); + + /* * Check for periodic writeback, kupdated() style */ wrote += wb_check_old_data_flush(wb); @@ -1947,10 +1968,33 @@ void wb_workfn(struct work_struct *work) } /* - * Start writeback of `nr_pages' pages. If `nr_pages' is zero, write back - * the whole world. + * Start writeback of `nr_pages' pages on this bdi. If `nr_pages' is zero, + * write back the whole world. */ -void wakeup_flusher_threads(long nr_pages, enum wb_reason reason) +static void __wakeup_flusher_threads_bdi(struct backing_dev_info *bdi, + enum wb_reason reason) +{ + struct bdi_writeback *wb; + + if (!bdi_has_dirty_io(bdi)) + return; + + list_for_each_entry_rcu(wb, &bdi->wb_list, bdi_node) + wb_start_writeback(wb, reason); +} + +void wakeup_flusher_threads_bdi(struct backing_dev_info *bdi, + enum wb_reason reason) +{ + rcu_read_lock(); + __wakeup_flusher_threads_bdi(bdi, reason); + rcu_read_unlock(); +} + +/* + * Wakeup the flusher threads to start writeback of all currently dirty pages + */ +void wakeup_flusher_threads(enum wb_reason reason) { struct backing_dev_info *bdi; @@ -1960,20 +2004,9 @@ void wakeup_flusher_threads(long nr_pages, enum wb_reason reason) if (blk_needs_flush_plug(current)) blk_schedule_flush_plug(current); - if (!nr_pages) - nr_pages = get_nr_dirty_pages(); - rcu_read_lock(); - list_for_each_entry_rcu(bdi, &bdi_list, bdi_list) { - struct bdi_writeback *wb; - - if (!bdi_has_dirty_io(bdi)) - continue; - - list_for_each_entry_rcu(wb, &bdi->wb_list, bdi_node) - wb_start_writeback(wb, wb_split_bdi_pages(wb, nr_pages), - false, reason); - } + list_for_each_entry_rcu(bdi, &bdi_list, bdi_list) + __wakeup_flusher_threads_bdi(bdi, reason); rcu_read_unlock(); } @@ -2343,37 +2376,19 @@ void writeback_inodes_sb(struct super_block *sb, enum wb_reason reason) EXPORT_SYMBOL(writeback_inodes_sb); /** - * try_to_writeback_inodes_sb_nr - try to start writeback if none underway + * try_to_writeback_inodes_sb - try to start writeback if none underway * @sb: the superblock - * @nr: the number of pages to write - * @reason: the reason of writeback + * @reason: reason why some writeback work was initiated * - * Invoke writeback_inodes_sb_nr if no writeback is currently underway. - * Returns 1 if writeback was started, 0 if not. + * Invoke __writeback_inodes_sb_nr if no writeback is currently underway. */ -bool try_to_writeback_inodes_sb_nr(struct super_block *sb, unsigned long nr, - enum wb_reason reason) +void try_to_writeback_inodes_sb(struct super_block *sb, enum wb_reason reason) { if (!down_read_trylock(&sb->s_umount)) - return false; + return; - __writeback_inodes_sb_nr(sb, nr, reason, true); + __writeback_inodes_sb_nr(sb, get_nr_dirty_pages(), reason, true); up_read(&sb->s_umount); - return true; -} -EXPORT_SYMBOL(try_to_writeback_inodes_sb_nr); - -/** - * try_to_writeback_inodes_sb - try to start writeback if none underway - * @sb: the superblock - * @reason: reason why some writeback work was initiated - * - * Implement by try_to_writeback_inodes_sb_nr() - * Returns 1 if writeback was started, 0 if not. - */ -bool try_to_writeback_inodes_sb(struct super_block *sb, enum wb_reason reason) -{ - return try_to_writeback_inodes_sb_nr(sb, get_nr_dirty_pages(), reason); } EXPORT_SYMBOL(try_to_writeback_inodes_sb); @@ -1057,7 +1057,7 @@ iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter, if (!(iocb->ki_flags & IOCB_HIPRI) || !dio->submit.last_queue || - !blk_mq_poll(dio->submit.last_queue, + !blk_poll(dio->submit.last_queue, dio->submit.cookie)) io_schedule(); } diff --git a/fs/ntfs/aops.c b/fs/ntfs/aops.c index cc91856..3a2e509 100644 --- a/fs/ntfs/aops.c +++ b/fs/ntfs/aops.c @@ -1739,7 +1739,7 @@ void mark_ntfs_record_dirty(struct page *page, const unsigned int ofs) { spin_lock(&mapping->private_lock); if (unlikely(!page_has_buffers(page))) { spin_unlock(&mapping->private_lock); - bh = head = alloc_page_buffers(page, bh_size, 1); + bh = head = alloc_page_buffers(page, bh_size, true); spin_lock(&mapping->private_lock); if (likely(!page_has_buffers(page))) { struct buffer_head *tail; diff --git a/fs/ntfs/mft.c b/fs/ntfs/mft.c index b6f4021..ee8392a 100644 --- a/fs/ntfs/mft.c +++ b/fs/ntfs/mft.c @@ -507,7 +507,7 @@ int ntfs_sync_mft_mirror(ntfs_volume *vol, const unsigned long mft_no, if (unlikely(!page_has_buffers(page))) { struct buffer_head *tail; - bh = head = alloc_page_buffers(page, blocksize, 1); + bh = head = alloc_page_buffers(page, blocksize, true); do { set_buffer_uptodate(bh); tail = bh; @@ -109,7 +109,7 @@ SYSCALL_DEFINE0(sync) { int nowait = 0, wait = 1; - wakeup_flusher_threads(0, WB_REASON_SYNC); + wakeup_flusher_threads(WB_REASON_SYNC); iterate_supers(sync_inodes_one_sb, NULL); iterate_supers(sync_fs_one_sb, &nowait); iterate_supers(sync_fs_one_sb, &wait); diff --git a/include/linux/backing-dev-defs.h b/include/linux/backing-dev-defs.h index fff4cfa..bfe86b5 100644 --- a/include/linux/backing-dev-defs.h +++ b/include/linux/backing-dev-defs.h @@ -25,6 +25,7 @@ enum wb_state { WB_shutting_down, /* wb_shutdown() in progress */ WB_writeback_running, /* Writeback is in progress */ WB_has_dirty_io, /* Dirty inodes on ->b_{dirty|io|more_io} */ + WB_start_all, /* nr_pages == 0 (all) work pending */ }; enum wb_congested_state { @@ -45,6 +46,28 @@ enum wb_stat_item { #define WB_STAT_BATCH (8*(1+ilog2(nr_cpu_ids))) /* + * why some writeback work was initiated + */ +enum wb_reason { + WB_REASON_BACKGROUND, + WB_REASON_VMSCAN, + WB_REASON_SYNC, + WB_REASON_PERIODIC, + WB_REASON_LAPTOP_TIMER, + WB_REASON_FREE_MORE_MEM, + WB_REASON_FS_FREE_SPACE, + /* + * There is no bdi forker thread any more and works are done + * by emergency worker, however, this is TPs userland visible + * and we'll be exposing exactly the same information, + * so it has a mismatch name. + */ + WB_REASON_FORKER_THREAD, + + WB_REASON_MAX, +}; + +/* * For cgroup writeback, multiple wb's may map to the same blkcg. Those * wb's can operate mostly independently but should share the congested * state. To facilitate such sharing, the congested state is tracked using @@ -116,6 +139,7 @@ struct bdi_writeback { struct fprop_local_percpu completions; int dirty_exceeded; + enum wb_reason start_all_reason; spinlock_t work_lock; /* protects work_list & dwork scheduling */ struct list_head work_list; diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h index 1662157..f41ca84 100644 --- a/include/linux/backing-dev.h +++ b/include/linux/backing-dev.h @@ -39,8 +39,6 @@ static inline struct backing_dev_info *bdi_alloc(gfp_t gfp_mask) return bdi_alloc_node(gfp_mask, NUMA_NO_NODE); } -void wb_start_writeback(struct bdi_writeback *wb, long nr_pages, - bool range_cyclic, enum wb_reason reason); void wb_start_background_writeback(struct bdi_writeback *wb); void wb_workfn(struct work_struct *work); void wb_wakeup_delayed(struct bdi_writeback *wb); @@ -175,8 +173,6 @@ static inline int wb_congested(struct bdi_writeback *wb, int cong_bits) long congestion_wait(int sync, long timeout); long wait_iff_congested(struct pglist_data *pgdat, int sync, long timeout); -int pdflush_proc_obsolete(struct ctl_table *table, int write, - void __user *buffer, size_t *lenp, loff_t *ppos); static inline bool bdi_cap_stable_pages_required(struct backing_dev_info *bdi) { diff --git a/include/linux/bio.h b/include/linux/bio.h index 275c91c..d4eec19 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -129,18 +129,6 @@ static inline void *bio_data(struct bio *bio) #define bvec_to_phys(bv) (page_to_phys((bv)->bv_page) + (unsigned long) (bv)->bv_offset) /* - * queues that have highmem support enabled may still need to revert to - * PIO transfers occasionally and thus map high pages temporarily. For - * permanent PIO fall back, user is probably better off disabling highmem - * I/O completely on that queue (see ide-dma for example) - */ -#define __bio_kmap_atomic(bio, iter) \ - (kmap_atomic(bio_iter_iovec((bio), (iter)).bv_page) + \ - bio_iter_iovec((bio), (iter)).bv_offset) - -#define __bio_kunmap_atomic(addr) kunmap_atomic(addr) - -/* * merge helpers etc */ @@ -522,13 +510,11 @@ do { \ #ifdef CONFIG_BLK_CGROUP int bio_associate_blkcg(struct bio *bio, struct cgroup_subsys_state *blkcg_css); -int bio_associate_current(struct bio *bio); void bio_disassociate_task(struct bio *bio); void bio_clone_blkcg_association(struct bio *dst, struct bio *src); #else /* CONFIG_BLK_CGROUP */ static inline int bio_associate_blkcg(struct bio *bio, struct cgroup_subsys_state *blkcg_css) { return 0; } -static inline int bio_associate_current(struct bio *bio) { return -ENOENT; } static inline void bio_disassociate_task(struct bio *bio) { } static inline void bio_clone_blkcg_association(struct bio *dst, struct bio *src) { } @@ -575,17 +561,6 @@ static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags) } #endif -static inline char *__bio_kmap_irq(struct bio *bio, struct bvec_iter iter, - unsigned long *flags) -{ - return bvec_kmap_irq(&bio_iter_iovec(bio, iter), flags); -} -#define __bio_kunmap_irq(buf, flags) bvec_kunmap_irq(buf, flags) - -#define bio_kmap_irq(bio, flags) \ - __bio_kmap_irq((bio), (bio)->bi_iter, (flags)) -#define bio_kunmap_irq(buf,flags) __bio_kunmap_irq(buf, flags) - /* * BIO list management for use by remapping drivers (e.g. DM or MD) and loop. * diff --git a/include/linux/blk-cgroup.h b/include/linux/blk-cgroup.h index 8bbc371..e9825ff 100644 --- a/include/linux/blk-cgroup.h +++ b/include/linux/blk-cgroup.h @@ -20,6 +20,7 @@ #include <linux/radix-tree.h> #include <linux/blkdev.h> #include <linux/atomic.h> +#include <linux/kthread.h> /* percpu_counter batch for blkg_[rw]stats, per-cpu drift doesn't matter */ #define BLKG_STAT_CPU_BATCH (INT_MAX / 2) @@ -224,22 +225,16 @@ static inline struct blkcg *css_to_blkcg(struct cgroup_subsys_state *css) return css ? container_of(css, struct blkcg, css) : NULL; } -static inline struct blkcg *task_blkcg(struct task_struct *tsk) -{ - return css_to_blkcg(task_css(tsk, io_cgrp_id)); -} - static inline struct blkcg *bio_blkcg(struct bio *bio) { + struct cgroup_subsys_state *css; + if (bio && bio->bi_css) return css_to_blkcg(bio->bi_css); - return task_blkcg(current); -} - -static inline struct cgroup_subsys_state * -task_get_blkcg_css(struct task_struct *task) -{ - return task_get_css(task, io_cgrp_id); + css = kthread_blkcg(); + if (css) + return css_to_blkcg(css); + return css_to_blkcg(task_css(current, io_cgrp_id)); } /** @@ -736,12 +731,6 @@ struct blkcg_policy { #define blkcg_root_css ((struct cgroup_subsys_state *)ERR_PTR(-EINVAL)) -static inline struct cgroup_subsys_state * -task_get_blkcg_css(struct task_struct *task) -{ - return NULL; -} - #ifdef CONFIG_BLOCK static inline struct blkcg_gq *blkg_lookup(struct blkcg *blkcg, void *key) { return NULL; } diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h index 994cbb0..95c9a5c 100644 --- a/include/linux/blk-mq.h +++ b/include/linux/blk-mq.h @@ -31,10 +31,12 @@ struct blk_mq_hw_ctx { struct sbitmap ctx_map; + struct blk_mq_ctx *dispatch_from; + struct blk_mq_ctx **ctxs; unsigned int nr_ctx; - wait_queue_entry_t dispatch_wait; + wait_queue_entry_t dispatch_wait; atomic_t wait_index; struct blk_mq_tags *tags; @@ -91,6 +93,8 @@ struct blk_mq_queue_data { typedef blk_status_t (queue_rq_fn)(struct blk_mq_hw_ctx *, const struct blk_mq_queue_data *); +typedef bool (get_budget_fn)(struct blk_mq_hw_ctx *); +typedef void (put_budget_fn)(struct blk_mq_hw_ctx *); typedef enum blk_eh_timer_return (timeout_fn)(struct request *, bool); typedef int (init_hctx_fn)(struct blk_mq_hw_ctx *, void *, unsigned int); typedef void (exit_hctx_fn)(struct blk_mq_hw_ctx *, unsigned int); @@ -113,6 +117,15 @@ struct blk_mq_ops { queue_rq_fn *queue_rq; /* + * Reserve budget before queue request, once .queue_rq is + * run, it is driver's responsibility to release the + * reserved budget. Also we have to handle failure case + * of .get_budget for avoiding I/O deadlock. + */ + get_budget_fn *get_budget; + put_budget_fn *put_budget; + + /* * Called on request timeout */ timeout_fn *timeout; @@ -169,8 +182,7 @@ enum { BLK_MQ_S_STOPPED = 0, BLK_MQ_S_TAG_ACTIVE = 1, BLK_MQ_S_SCHED_RESTART = 2, - BLK_MQ_S_TAG_WAITING = 3, - BLK_MQ_S_START_ON_RUN = 4, + BLK_MQ_S_START_ON_RUN = 3, BLK_MQ_MAX_DEPTH = 10240, @@ -198,15 +210,21 @@ void blk_mq_free_request(struct request *rq); bool blk_mq_can_queue(struct blk_mq_hw_ctx *); enum { - BLK_MQ_REQ_NOWAIT = (1 << 0), /* return when out of requests */ - BLK_MQ_REQ_RESERVED = (1 << 1), /* allocate from reserved pool */ - BLK_MQ_REQ_INTERNAL = (1 << 2), /* allocate internal/sched tag */ + /* return when out of requests */ + BLK_MQ_REQ_NOWAIT = (__force blk_mq_req_flags_t)(1 << 0), + /* allocate from reserved pool */ + BLK_MQ_REQ_RESERVED = (__force blk_mq_req_flags_t)(1 << 1), + /* allocate internal/sched tag */ + BLK_MQ_REQ_INTERNAL = (__force blk_mq_req_flags_t)(1 << 2), + /* set RQF_PREEMPT */ + BLK_MQ_REQ_PREEMPT = (__force blk_mq_req_flags_t)(1 << 3), }; struct request *blk_mq_alloc_request(struct request_queue *q, unsigned int op, - unsigned int flags); + blk_mq_req_flags_t flags); struct request *blk_mq_alloc_request_hctx(struct request_queue *q, - unsigned int op, unsigned int flags, unsigned int hctx_idx); + unsigned int op, blk_mq_req_flags_t flags, + unsigned int hctx_idx); struct request *blk_mq_tag_to_rq(struct blk_mq_tags *tags, unsigned int tag); enum { @@ -249,7 +267,7 @@ void blk_mq_start_stopped_hw_queues(struct request_queue *q, bool async); void blk_mq_quiesce_queue(struct request_queue *q); void blk_mq_unquiesce_queue(struct request_queue *q); void blk_mq_delay_run_hw_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs); -void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async); +bool blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async); void blk_mq_run_hw_queues(struct request_queue *q, bool async); void blk_mq_delay_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs); void blk_mq_tagset_busy_iter(struct blk_mq_tag_set *tagset, @@ -260,8 +278,8 @@ void blk_freeze_queue_start(struct request_queue *q); void blk_mq_freeze_queue_wait(struct request_queue *q); int blk_mq_freeze_queue_wait_timeout(struct request_queue *q, unsigned long timeout); -int blk_mq_reinit_tagset(struct blk_mq_tag_set *set, - int (reinit_request)(void *, struct request *)); +int blk_mq_tagset_iter(struct blk_mq_tag_set *set, void *data, + int (reinit_request)(void *, struct request *)); int blk_mq_map_queues(struct blk_mq_tag_set *set); void blk_mq_update_nr_hw_queues(struct blk_mq_tag_set *set, int nr_hw_queues); diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index 96ac381..a1e628e 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -163,6 +163,8 @@ struct bio { */ #define BIO_RESET_BITS BVEC_POOL_OFFSET +typedef __u32 __bitwise blk_mq_req_flags_t; + /* * Operations and flags common to the bio and request structures. * We use 8 bits for encoding the operation, and the remaining 24 for flags. @@ -225,11 +227,14 @@ enum req_flag_bits { __REQ_PREFLUSH, /* request for cache flush */ __REQ_RAHEAD, /* read ahead, can fail anytime */ __REQ_BACKGROUND, /* background IO */ + __REQ_NOWAIT, /* Don't wait if request will block */ /* command specific flags for REQ_OP_WRITE_ZEROES: */ __REQ_NOUNMAP, /* do not free blocks when zeroing */ - __REQ_NOWAIT, /* Don't wait if request will block */ + /* for driver use */ + __REQ_DRV, + __REQ_NR_BITS, /* stops here */ }; @@ -246,9 +251,11 @@ enum req_flag_bits { #define REQ_PREFLUSH (1ULL << __REQ_PREFLUSH) #define REQ_RAHEAD (1ULL << __REQ_RAHEAD) #define REQ_BACKGROUND (1ULL << __REQ_BACKGROUND) +#define REQ_NOWAIT (1ULL << __REQ_NOWAIT) #define REQ_NOUNMAP (1ULL << __REQ_NOUNMAP) -#define REQ_NOWAIT (1ULL << __REQ_NOWAIT) + +#define REQ_DRV (1ULL << __REQ_DRV) #define REQ_FAILFAST_MASK \ (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER) @@ -330,11 +337,10 @@ static inline bool blk_qc_t_is_internal(blk_qc_t cookie) } struct blk_rq_stat { - s64 mean; + u64 mean; u64 min; u64 max; - s32 nr_samples; - s32 nr_batch; + u32 nr_samples; u64 batch; }; diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 8da6637..8089ca1 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -267,6 +267,7 @@ struct blk_queue_ctx; typedef void (request_fn_proc) (struct request_queue *q); typedef blk_qc_t (make_request_fn) (struct request_queue *q, struct bio *bio); +typedef bool (poll_q_fn) (struct request_queue *q, blk_qc_t); typedef int (prep_rq_fn) (struct request_queue *, struct request *); typedef void (unprep_rq_fn) (struct request_queue *, struct request *); @@ -409,6 +410,7 @@ struct request_queue { request_fn_proc *request_fn; make_request_fn *make_request_fn; + poll_q_fn *poll_fn; prep_rq_fn *prep_rq_fn; unprep_rq_fn *unprep_rq_fn; softirq_done_fn *softirq_done_fn; @@ -610,7 +612,6 @@ struct request_queue { #define QUEUE_FLAG_NOMERGES 5 /* disable merge attempts */ #define QUEUE_FLAG_SAME_COMP 6 /* complete on same CPU-group */ #define QUEUE_FLAG_FAIL_IO 7 /* fake timeout */ -#define QUEUE_FLAG_STACKABLE 8 /* supports request stacking */ #define QUEUE_FLAG_NONROT 9 /* non-rotational device (SSD) */ #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ #define QUEUE_FLAG_IO_STAT 10 /* do IO stats */ @@ -632,14 +633,13 @@ struct request_queue { #define QUEUE_FLAG_REGISTERED 26 /* queue has been registered to a disk */ #define QUEUE_FLAG_SCSI_PASSTHROUGH 27 /* queue supports SCSI commands */ #define QUEUE_FLAG_QUIESCED 28 /* queue has been quiesced */ +#define QUEUE_FLAG_PREEMPT_ONLY 29 /* only process REQ_PREEMPT requests */ #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ - (1 << QUEUE_FLAG_STACKABLE) | \ (1 << QUEUE_FLAG_SAME_COMP) | \ (1 << QUEUE_FLAG_ADD_RANDOM)) #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ - (1 << QUEUE_FLAG_STACKABLE) | \ (1 << QUEUE_FLAG_SAME_COMP) | \ (1 << QUEUE_FLAG_POLL)) @@ -723,8 +723,6 @@ static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) #define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags) #define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags) #define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags) -#define blk_queue_stackable(q) \ - test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags) #define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags) #define blk_queue_secure_erase(q) \ (test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags)) @@ -736,6 +734,11 @@ static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ REQ_FAILFAST_DRIVER)) #define blk_queue_quiesced(q) test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags) +#define blk_queue_preempt_only(q) \ + test_bit(QUEUE_FLAG_PREEMPT_ONLY, &(q)->queue_flags) + +extern int blk_set_preempt_only(struct request_queue *q); +extern void blk_clear_preempt_only(struct request_queue *q); static inline bool blk_account_rq(struct request *rq) { @@ -923,24 +926,17 @@ static inline void rq_flush_dcache_pages(struct request *rq) } #endif -#ifdef CONFIG_PRINTK -#define vfs_msg(sb, level, fmt, ...) \ - __vfs_msg(sb, level, fmt, ##__VA_ARGS__) -#else -#define vfs_msg(sb, level, fmt, ...) \ -do { \ - no_printk(fmt, ##__VA_ARGS__); \ - __vfs_msg(sb, "", " "); \ -} while (0) -#endif - extern int blk_register_queue(struct gendisk *disk); extern void blk_unregister_queue(struct gendisk *disk); extern blk_qc_t generic_make_request(struct bio *bio); +extern blk_qc_t direct_make_request(struct bio *bio); extern void blk_rq_init(struct request_queue *q, struct request *rq); extern void blk_init_request_from_bio(struct request *req, struct bio *bio); extern void blk_put_request(struct request *); extern void __blk_put_request(struct request_queue *, struct request *); +extern struct request *blk_get_request_flags(struct request_queue *, + unsigned int op, + blk_mq_req_flags_t flags); extern struct request *blk_get_request(struct request_queue *, unsigned int op, gfp_t gfp_mask); extern void blk_requeue_request(struct request_queue *, struct request *); @@ -964,7 +960,7 @@ extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t, extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t, struct scsi_ioctl_command __user *); -extern int blk_queue_enter(struct request_queue *q, bool nowait); +extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags); extern void blk_queue_exit(struct request_queue *q); extern void blk_start_queue(struct request_queue *q); extern void blk_start_queue_async(struct request_queue *q); @@ -991,7 +987,7 @@ extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, int blk_status_to_errno(blk_status_t status); blk_status_t errno_to_blk_status(int errno); -bool blk_mq_poll(struct request_queue *q, blk_qc_t cookie); +bool blk_poll(struct request_queue *q, blk_qc_t cookie); static inline struct request_queue *bdev_get_queue(struct block_device *bdev) { @@ -1110,6 +1106,8 @@ extern struct request *blk_peek_request(struct request_queue *q); extern void blk_start_request(struct request *rq); extern struct request *blk_fetch_request(struct request_queue *q); +void blk_steal_bios(struct bio_list *list, struct request *rq); + /* * Request completion related functions. * @@ -1372,7 +1370,7 @@ static inline int sb_issue_zeroout(struct super_block *sb, sector_t block, gfp_mask, 0); } -extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm); +extern int blk_verify_command(unsigned char *cmd, fmode_t mode); enum blk_default_limits { BLK_MAX_SEGMENTS = 128, diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h index afa37f8..8b1bf8d 100644 --- a/include/linux/buffer_head.h +++ b/include/linux/buffer_head.h @@ -157,7 +157,7 @@ void set_bh_page(struct buffer_head *bh, struct page *page, unsigned long offset); int try_to_free_buffers(struct page *); struct buffer_head *alloc_page_buffers(struct page *page, unsigned long size, - int retry); + bool retry); void create_empty_buffers(struct page *, unsigned long, unsigned long b_state); void end_buffer_read_sync(struct buffer_head *bh, int uptodate); diff --git a/include/linux/elevator.h b/include/linux/elevator.h index ddb7632..3d794b3 100644 --- a/include/linux/elevator.h +++ b/include/linux/elevator.h @@ -145,6 +145,7 @@ struct elevator_type size_t icq_align; /* ditto */ struct elv_fs_entry *elevator_attrs; char elevator_name[ELV_NAME_MAX]; + const char *elevator_alias; struct module *elevator_owner; bool uses_mq; #ifdef CONFIG_BLK_DEBUG_FS diff --git a/include/linux/genhd.h b/include/linux/genhd.h index eaefb7a..5144ebe 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -141,6 +141,7 @@ struct hd_struct { #define GENHD_FL_NATIVE_CAPACITY 128 #define GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE 256 #define GENHD_FL_NO_PART_SCAN 512 +#define GENHD_FL_HIDDEN 1024 enum { DISK_EVENT_MEDIA_CHANGE = 1 << 0, /* media changed */ @@ -236,7 +237,7 @@ static inline bool disk_part_scan_enabled(struct gendisk *disk) static inline dev_t disk_devt(struct gendisk *disk) { - return disk_to_dev(disk)->devt; + return MKDEV(disk->major, disk->first_minor); } static inline dev_t part_devt(struct hd_struct *part) @@ -244,6 +245,7 @@ static inline dev_t part_devt(struct hd_struct *part) return part_to_dev(part)->devt; } +extern struct hd_struct *__disk_get_part(struct gendisk *disk, int partno); extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno); static inline void disk_put_part(struct hd_struct *part) diff --git a/include/linux/kthread.h b/include/linux/kthread.h index 86d53a3..3203e36 100644 --- a/include/linux/kthread.h +++ b/include/linux/kthread.h @@ -4,6 +4,7 @@ /* Simple interface for creating and stopping kernel threads without mess. */ #include <linux/err.h> #include <linux/sched.h> +#include <linux/cgroup.h> __printf(4, 5) struct task_struct *kthread_create_on_node(int (*threadfn)(void *data), @@ -199,4 +200,14 @@ bool kthread_cancel_delayed_work_sync(struct kthread_delayed_work *work); void kthread_destroy_worker(struct kthread_worker *worker); +#ifdef CONFIG_BLK_CGROUP +void kthread_associate_blkcg(struct cgroup_subsys_state *css); +struct cgroup_subsys_state *kthread_blkcg(void); +#else +static inline void kthread_associate_blkcg(struct cgroup_subsys_state *css) { } +static inline struct cgroup_subsys_state *kthread_blkcg(void) +{ + return NULL; +} +#endif #endif /* _LINUX_KTHREAD_H */ diff --git a/include/linux/lightnvm.h b/include/linux/lightnvm.h index a29a8db..2d1d9de 100644 --- a/include/linux/lightnvm.h +++ b/include/linux/lightnvm.h @@ -57,6 +57,7 @@ typedef int (nvm_get_l2p_tbl_fn)(struct nvm_dev *, u64, u32, typedef int (nvm_op_bb_tbl_fn)(struct nvm_dev *, struct ppa_addr, u8 *); typedef int (nvm_op_set_bb_fn)(struct nvm_dev *, struct ppa_addr *, int, int); typedef int (nvm_submit_io_fn)(struct nvm_dev *, struct nvm_rq *); +typedef int (nvm_submit_io_sync_fn)(struct nvm_dev *, struct nvm_rq *); typedef void *(nvm_create_dma_pool_fn)(struct nvm_dev *, char *); typedef void (nvm_destroy_dma_pool_fn)(void *); typedef void *(nvm_dev_dma_alloc_fn)(struct nvm_dev *, void *, gfp_t, @@ -70,6 +71,7 @@ struct nvm_dev_ops { nvm_op_set_bb_fn *set_bb_tbl; nvm_submit_io_fn *submit_io; + nvm_submit_io_sync_fn *submit_io_sync; nvm_create_dma_pool_fn *create_dma_pool; nvm_destroy_dma_pool_fn *destroy_dma_pool; @@ -461,10 +463,9 @@ struct nvm_tgt_type { /* For internal use */ struct list_head list; + struct module *owner; }; -extern struct nvm_tgt_type *nvm_find_target_type(const char *, int); - extern int nvm_register_tgt_type(struct nvm_tgt_type *); extern void nvm_unregister_tgt_type(struct nvm_tgt_type *); @@ -479,10 +480,8 @@ extern int nvm_set_tgt_bb_tbl(struct nvm_tgt_dev *, struct ppa_addr *, int, int); extern int nvm_max_phys_sects(struct nvm_tgt_dev *); extern int nvm_submit_io(struct nvm_tgt_dev *, struct nvm_rq *); +extern int nvm_submit_io_sync(struct nvm_tgt_dev *, struct nvm_rq *); extern int nvm_erase_sync(struct nvm_tgt_dev *, struct ppa_addr *, int); -extern int nvm_set_rqd_ppalist(struct nvm_tgt_dev *, struct nvm_rq *, - const struct ppa_addr *, int, int); -extern void nvm_free_rqd_ppalist(struct nvm_tgt_dev *, struct nvm_rq *); extern int nvm_get_l2p_tbl(struct nvm_tgt_dev *, u64, u32, nvm_l2p_update_fn *, void *); extern int nvm_get_area(struct nvm_tgt_dev *, sector_t *, sector_t); @@ -491,8 +490,6 @@ extern void nvm_end_io(struct nvm_rq *); extern int nvm_bb_tbl_fold(struct nvm_dev *, u8 *, int); extern int nvm_get_tgt_bb_tbl(struct nvm_tgt_dev *, struct ppa_addr, u8 *); -extern int nvm_dev_factory(struct nvm_dev *, int flags); - extern void nvm_part_to_tgt(struct nvm_dev *, sector_t *, int); #else /* CONFIG_NVM */ diff --git a/include/linux/nvme-fc-driver.h b/include/linux/nvme-fc-driver.h index a726f96..496ff75 100644 --- a/include/linux/nvme-fc-driver.h +++ b/include/linux/nvme-fc-driver.h @@ -40,6 +40,8 @@ * @node_name: FC WWNN for the port * @port_name: FC WWPN for the port * @port_role: What NVME roles are supported (see FC_PORT_ROLE_xxx) + * @dev_loss_tmo: maximum delay for reconnects to an association on + * this device. Used only on a remoteport. * * Initialization values for dynamic port fields: * @port_id: FC N_Port_ID currently assigned the port. Upper 8 bits must @@ -50,6 +52,7 @@ struct nvme_fc_port_info { u64 port_name; u32 port_role; u32 port_id; + u32 dev_loss_tmo; }; @@ -102,8 +105,6 @@ enum nvmefc_fcp_datadir { }; -#define NVME_FC_MAX_SEGMENTS 256 - /** * struct nvmefc_fcp_req - Request structure passed from NVME-FC transport * to LLDD in order to perform a NVME FCP IO operation. @@ -202,6 +203,9 @@ enum nvme_fc_obj_state { * The length of the buffer corresponds to the local_priv_sz * value specified in the nvme_fc_port_template supplied by * the LLDD. + * @dev_loss_tmo: maximum delay for reconnects to an association on + * this device. To modify, lldd must call + * nvme_fc_set_remoteport_devloss(). * * Fields with dynamic values. Values may change base on link state. LLDD * may reference fields directly to change them. Initialized by the @@ -259,10 +263,9 @@ struct nvme_fc_remote_port { u32 port_role; u64 node_name; u64 port_name; - struct nvme_fc_local_port *localport; - void *private; + u32 dev_loss_tmo; /* dynamic fields */ u32 port_id; @@ -446,6 +449,10 @@ int nvme_fc_register_remoteport(struct nvme_fc_local_port *localport, int nvme_fc_unregister_remoteport(struct nvme_fc_remote_port *remoteport); +void nvme_fc_rescan_remoteport(struct nvme_fc_remote_port *remoteport); + +int nvme_fc_set_remoteport_devloss(struct nvme_fc_remote_port *remoteport, + u32 dev_loss_tmo); /* diff --git a/include/linux/nvme.h b/include/linux/nvme.h index 9310ce77..aea87f0d 100644 --- a/include/linux/nvme.h +++ b/include/linux/nvme.h @@ -90,6 +90,14 @@ enum { }; #define NVME_AQ_DEPTH 32 +#define NVME_NR_AEN_COMMANDS 1 +#define NVME_AQ_BLK_MQ_DEPTH (NVME_AQ_DEPTH - NVME_NR_AEN_COMMANDS) + +/* + * Subtract one to leave an empty queue entry for 'Full Queue' condition. See + * NVM-Express 1.2 specification, section 4.1.2. + */ +#define NVME_AQ_MQ_TAG_DEPTH (NVME_AQ_BLK_MQ_DEPTH - 1) enum { NVME_REG_CAP = 0x0000, /* Controller Capabilities */ @@ -267,6 +275,7 @@ enum { NVME_CTRL_OACS_SEC_SUPP = 1 << 0, NVME_CTRL_OACS_DIRECTIVES = 1 << 5, NVME_CTRL_OACS_DBBUF_SUPP = 1 << 8, + NVME_CTRL_LPA_CMD_EFFECTS_LOG = 1 << 1, }; struct nvme_lbaf { @@ -396,6 +405,21 @@ struct nvme_fw_slot_info_log { }; enum { + NVME_CMD_EFFECTS_CSUPP = 1 << 0, + NVME_CMD_EFFECTS_LBCC = 1 << 1, + NVME_CMD_EFFECTS_NCC = 1 << 2, + NVME_CMD_EFFECTS_NIC = 1 << 3, + NVME_CMD_EFFECTS_CCC = 1 << 4, + NVME_CMD_EFFECTS_CSE_MASK = 3 << 16, +}; + +struct nvme_effects_log { + __le32 acs[256]; + __le32 iocs[256]; + __u8 resv[2048]; +}; + +enum { NVME_SMART_CRIT_SPARE = 1 << 0, NVME_SMART_CRIT_TEMPERATURE = 1 << 1, NVME_SMART_CRIT_RELIABILITY = 1 << 2, @@ -404,6 +428,10 @@ enum { }; enum { + NVME_AER_ERROR = 0, + NVME_AER_SMART = 1, + NVME_AER_CSS = 6, + NVME_AER_VS = 7, NVME_AER_NOTICE_NS_CHANGED = 0x0002, NVME_AER_NOTICE_FW_ACT_STARTING = 0x0102, }; @@ -681,6 +709,7 @@ enum nvme_admin_opcode { nvme_admin_format_nvm = 0x80, nvme_admin_security_send = 0x81, nvme_admin_security_recv = 0x82, + nvme_admin_sanitize_nvm = 0x84, }; enum { @@ -712,6 +741,7 @@ enum { NVME_LOG_ERROR = 0x01, NVME_LOG_SMART = 0x02, NVME_LOG_FW_SLOT = 0x03, + NVME_LOG_CMD_EFFECTS = 0x05, NVME_LOG_DISC = 0x70, NVME_LOG_RESERVATION = 0x80, NVME_FWACT_REPL = (0 << 3), diff --git a/include/linux/sbitmap.h b/include/linux/sbitmap.h index a1904aa..0dcc60e8 100644 --- a/include/linux/sbitmap.h +++ b/include/linux/sbitmap.h @@ -211,10 +211,14 @@ bool sbitmap_any_bit_set(const struct sbitmap *sb); */ bool sbitmap_any_bit_clear(const struct sbitmap *sb); +#define SB_NR_TO_INDEX(sb, bitnr) ((bitnr) >> (sb)->shift) +#define SB_NR_TO_BIT(sb, bitnr) ((bitnr) & ((1U << (sb)->shift) - 1U)) + typedef bool (*sb_for_each_fn)(struct sbitmap *, unsigned int, void *); /** - * sbitmap_for_each_set() - Iterate over each set bit in a &struct sbitmap. + * __sbitmap_for_each_set() - Iterate over each set bit in a &struct sbitmap. + * @start: Where to start the iteration. * @sb: Bitmap to iterate over. * @fn: Callback. Should return true to continue or false to break early. * @data: Pointer to pass to callback. @@ -222,35 +226,61 @@ typedef bool (*sb_for_each_fn)(struct sbitmap *, unsigned int, void *); * This is inline even though it's non-trivial so that the function calls to the * callback will hopefully get optimized away. */ -static inline void sbitmap_for_each_set(struct sbitmap *sb, sb_for_each_fn fn, - void *data) +static inline void __sbitmap_for_each_set(struct sbitmap *sb, + unsigned int start, + sb_for_each_fn fn, void *data) { - unsigned int i; + unsigned int index; + unsigned int nr; + unsigned int scanned = 0; - for (i = 0; i < sb->map_nr; i++) { - struct sbitmap_word *word = &sb->map[i]; - unsigned int off, nr; + if (start >= sb->depth) + start = 0; + index = SB_NR_TO_INDEX(sb, start); + nr = SB_NR_TO_BIT(sb, start); - if (!word->word) - continue; + while (scanned < sb->depth) { + struct sbitmap_word *word = &sb->map[index]; + unsigned int depth = min_t(unsigned int, word->depth - nr, + sb->depth - scanned); - nr = 0; - off = i << sb->shift; + scanned += depth; + if (!word->word) + goto next; + + /* + * On the first iteration of the outer loop, we need to add the + * bit offset back to the size of the word for find_next_bit(). + * On all other iterations, nr is zero, so this is a noop. + */ + depth += nr; while (1) { - nr = find_next_bit(&word->word, word->depth, nr); - if (nr >= word->depth) + nr = find_next_bit(&word->word, depth, nr); + if (nr >= depth) break; - - if (!fn(sb, off + nr, data)) + if (!fn(sb, (index << sb->shift) + nr, data)) return; nr++; } +next: + nr = 0; + if (++index >= sb->map_nr) + index = 0; } } -#define SB_NR_TO_INDEX(sb, bitnr) ((bitnr) >> (sb)->shift) -#define SB_NR_TO_BIT(sb, bitnr) ((bitnr) & ((1U << (sb)->shift) - 1U)) +/** + * sbitmap_for_each_set() - Iterate over each set bit in a &struct sbitmap. + * @sb: Bitmap to iterate over. + * @fn: Callback. Should return true to continue or false to break early. + * @data: Pointer to pass to callback. + */ +static inline void sbitmap_for_each_set(struct sbitmap *sb, sb_for_each_fn fn, + void *data) +{ + __sbitmap_for_each_set(sb, 0, fn, data); +} static inline unsigned long *__sbitmap_word(struct sbitmap *sb, unsigned int bitnr) diff --git a/include/linux/writeback.h b/include/linux/writeback.h index e12d928..f42d856 100644 --- a/include/linux/writeback.h +++ b/include/linux/writeback.h @@ -43,28 +43,6 @@ enum writeback_sync_modes { }; /* - * why some writeback work was initiated - */ -enum wb_reason { - WB_REASON_BACKGROUND, - WB_REASON_VMSCAN, - WB_REASON_SYNC, - WB_REASON_PERIODIC, - WB_REASON_LAPTOP_TIMER, - WB_REASON_FREE_MORE_MEM, - WB_REASON_FS_FREE_SPACE, - /* - * There is no bdi forker thread any more and works are done - * by emergency worker, however, this is TPs userland visible - * and we'll be exposing exactly the same information, - * so it has a mismatch name. - */ - WB_REASON_FORKER_THREAD, - - WB_REASON_MAX, -}; - -/* * A control structure which tells the writeback code what to do. These are * always on the stack, and hence need no locking. They are always initialised * in a manner such that unspecified fields are set to zero. @@ -186,11 +164,11 @@ struct bdi_writeback; void writeback_inodes_sb(struct super_block *, enum wb_reason reason); void writeback_inodes_sb_nr(struct super_block *, unsigned long nr, enum wb_reason reason); -bool try_to_writeback_inodes_sb(struct super_block *, enum wb_reason reason); -bool try_to_writeback_inodes_sb_nr(struct super_block *, unsigned long nr, - enum wb_reason reason); +void try_to_writeback_inodes_sb(struct super_block *sb, enum wb_reason reason); void sync_inodes_sb(struct super_block *); -void wakeup_flusher_threads(long nr_pages, enum wb_reason reason); +void wakeup_flusher_threads(enum wb_reason reason); +void wakeup_flusher_threads_bdi(struct backing_dev_info *bdi, + enum wb_reason reason); void inode_wait_for_writeback(struct inode *inode); /* writeback.h requires fs.h; it, too, is not included from here. */ diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h index 571ddb4..73af87d 100644 --- a/include/scsi/scsi_device.h +++ b/include/scsi/scsi_device.h @@ -221,6 +221,7 @@ struct scsi_device { unsigned char access_state; struct mutex state_mutex; enum scsi_device_state sdev_state; + struct task_struct *quiesced_by; unsigned long sdev_data[0]; } __attribute__((aligned(sizeof(unsigned long)))); diff --git a/include/trace/events/writeback.h b/include/trace/events/writeback.h index 2e1fa79..32db72c 100644 --- a/include/trace/events/writeback.h +++ b/include/trace/events/writeback.h @@ -287,7 +287,6 @@ DEFINE_EVENT(writeback_class, name, \ TP_PROTO(struct bdi_writeback *wb), \ TP_ARGS(wb)) -DEFINE_WRITEBACK_EVENT(writeback_nowork); DEFINE_WRITEBACK_EVENT(writeback_wake_background); TRACE_EVENT(writeback_bdi_register, diff --git a/kernel/kthread.c b/kernel/kthread.c index ba3992c..8af3130 100644 --- a/kernel/kthread.c +++ b/kernel/kthread.c @@ -20,7 +20,6 @@ #include <linux/freezer.h> #include <linux/ptrace.h> #include <linux/uaccess.h> -#include <linux/cgroup.h> #include <trace/events/sched.h> static DEFINE_SPINLOCK(kthread_create_lock); @@ -47,6 +46,9 @@ struct kthread { void *data; struct completion parked; struct completion exited; +#ifdef CONFIG_BLK_CGROUP + struct cgroup_subsys_state *blkcg_css; +#endif }; enum KTHREAD_BITS { @@ -74,11 +76,17 @@ static inline struct kthread *to_kthread(struct task_struct *k) void free_kthread_struct(struct task_struct *k) { + struct kthread *kthread; + /* * Can be NULL if this kthread was created by kernel_thread() * or if kmalloc() in kthread() failed. */ - kfree(to_kthread(k)); + kthread = to_kthread(k); +#ifdef CONFIG_BLK_CGROUP + WARN_ON_ONCE(kthread && kthread->blkcg_css); +#endif + kfree(kthread); } /** @@ -196,7 +204,7 @@ static int kthread(void *_create) struct kthread *self; int ret; - self = kmalloc(sizeof(*self), GFP_KERNEL); + self = kzalloc(sizeof(*self), GFP_KERNEL); set_kthread_struct(self); /* If user was SIGKILLed, I release the structure. */ @@ -212,7 +220,6 @@ static int kthread(void *_create) do_exit(-ENOMEM); } - self->flags = 0; self->data = data; init_completion(&self->exited); init_completion(&self->parked); @@ -1152,3 +1159,54 @@ void kthread_destroy_worker(struct kthread_worker *worker) kfree(worker); } EXPORT_SYMBOL(kthread_destroy_worker); + +#ifdef CONFIG_BLK_CGROUP +/** + * kthread_associate_blkcg - associate blkcg to current kthread + * @css: the cgroup info + * + * Current thread must be a kthread. The thread is running jobs on behalf of + * other threads. In some cases, we expect the jobs attach cgroup info of + * original threads instead of that of current thread. This function stores + * original thread's cgroup info in current kthread context for later + * retrieval. + */ +void kthread_associate_blkcg(struct cgroup_subsys_state *css) +{ + struct kthread *kthread; + + if (!(current->flags & PF_KTHREAD)) + return; + kthread = to_kthread(current); + if (!kthread) + return; + + if (kthread->blkcg_css) { + css_put(kthread->blkcg_css); + kthread->blkcg_css = NULL; + } + if (css) { + css_get(css); + kthread->blkcg_css = css; + } +} +EXPORT_SYMBOL(kthread_associate_blkcg); + +/** + * kthread_blkcg - get associated blkcg css of current kthread + * + * Current thread must be a kthread. + */ +struct cgroup_subsys_state *kthread_blkcg(void) +{ + struct kthread *kthread; + + if (current->flags & PF_KTHREAD) { + kthread = to_kthread(current); + if (kthread) + return kthread->blkcg_css; + } + return NULL; +} +EXPORT_SYMBOL(kthread_blkcg); +#endif diff --git a/kernel/sysctl.c b/kernel/sysctl.c index d9c31bc..9576bd5 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -1342,11 +1342,6 @@ static struct ctl_table vm_table[] = { .extra1 = &zero, }, { - .procname = "nr_pdflush_threads", - .mode = 0444 /* read-only */, - .proc_handler = pdflush_proc_obsolete, - }, - { .procname = "swappiness", .data = &vm_swappiness, .maxlen = sizeof(vm_swappiness), diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c index 45a3928..206e0e2 100644 --- a/kernel/trace/blktrace.c +++ b/kernel/trace/blktrace.c @@ -66,7 +66,8 @@ static struct tracer_flags blk_tracer_flags = { }; /* Global reference count of probes */ -static atomic_t blk_probes_ref = ATOMIC_INIT(0); +static DEFINE_MUTEX(blk_probe_mutex); +static int blk_probes_ref; static void blk_register_tracepoints(void); static void blk_unregister_tracepoints(void); @@ -329,14 +330,29 @@ static void blk_trace_free(struct blk_trace *bt) kfree(bt); } +static void get_probe_ref(void) +{ + mutex_lock(&blk_probe_mutex); + if (++blk_probes_ref == 1) + blk_register_tracepoints(); + mutex_unlock(&blk_probe_mutex); +} + +static void put_probe_ref(void) +{ + mutex_lock(&blk_probe_mutex); + if (!--blk_probes_ref) + blk_unregister_tracepoints(); + mutex_unlock(&blk_probe_mutex); +} + static void blk_trace_cleanup(struct blk_trace *bt) { blk_trace_free(bt); - if (atomic_dec_and_test(&blk_probes_ref)) - blk_unregister_tracepoints(); + put_probe_ref(); } -int blk_trace_remove(struct request_queue *q) +static int __blk_trace_remove(struct request_queue *q) { struct blk_trace *bt; @@ -349,6 +365,17 @@ int blk_trace_remove(struct request_queue *q) return 0; } + +int blk_trace_remove(struct request_queue *q) +{ + int ret; + + mutex_lock(&q->blk_trace_mutex); + ret = __blk_trace_remove(q); + mutex_unlock(&q->blk_trace_mutex); + + return ret; +} EXPORT_SYMBOL_GPL(blk_trace_remove); static ssize_t blk_dropped_read(struct file *filp, char __user *buffer, @@ -538,8 +565,7 @@ static int do_blk_trace_setup(struct request_queue *q, char *name, dev_t dev, if (cmpxchg(&q->blk_trace, NULL, bt)) goto err; - if (atomic_inc_return(&blk_probes_ref) == 1) - blk_register_tracepoints(); + get_probe_ref(); ret = 0; err: @@ -550,9 +576,8 @@ err: return ret; } -int blk_trace_setup(struct request_queue *q, char *name, dev_t dev, - struct block_device *bdev, - char __user *arg) +static int __blk_trace_setup(struct request_queue *q, char *name, dev_t dev, + struct block_device *bdev, char __user *arg) { struct blk_user_trace_setup buts; int ret; @@ -571,6 +596,19 @@ int blk_trace_setup(struct request_queue *q, char *name, dev_t dev, } return 0; } + +int blk_trace_setup(struct request_queue *q, char *name, dev_t dev, + struct block_device *bdev, + char __user *arg) +{ + int ret; + + mutex_lock(&q->blk_trace_mutex); + ret = __blk_trace_setup(q, name, dev, bdev, arg); + mutex_unlock(&q->blk_trace_mutex); + + return ret; +} EXPORT_SYMBOL_GPL(blk_trace_setup); #if defined(CONFIG_COMPAT) && defined(CONFIG_X86_64) @@ -607,7 +645,7 @@ static int compat_blk_trace_setup(struct request_queue *q, char *name, } #endif -int blk_trace_startstop(struct request_queue *q, int start) +static int __blk_trace_startstop(struct request_queue *q, int start) { int ret; struct blk_trace *bt = q->blk_trace; @@ -646,6 +684,17 @@ int blk_trace_startstop(struct request_queue *q, int start) return ret; } + +int blk_trace_startstop(struct request_queue *q, int start) +{ + int ret; + + mutex_lock(&q->blk_trace_mutex); + ret = __blk_trace_startstop(q, start); + mutex_unlock(&q->blk_trace_mutex); + + return ret; +} EXPORT_SYMBOL_GPL(blk_trace_startstop); /* @@ -676,7 +725,7 @@ int blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg) switch (cmd) { case BLKTRACESETUP: bdevname(bdev, b); - ret = blk_trace_setup(q, b, bdev->bd_dev, bdev, arg); + ret = __blk_trace_setup(q, b, bdev->bd_dev, bdev, arg); break; #if defined(CONFIG_COMPAT) && defined(CONFIG_X86_64) case BLKTRACESETUP32: @@ -687,10 +736,10 @@ int blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg) case BLKTRACESTART: start = 1; case BLKTRACESTOP: - ret = blk_trace_startstop(q, start); + ret = __blk_trace_startstop(q, start); break; case BLKTRACETEARDOWN: - ret = blk_trace_remove(q); + ret = __blk_trace_remove(q); break; default: ret = -ENOTTY; @@ -708,10 +757,14 @@ int blk_trace_ioctl(struct block_device *bdev, unsigned cmd, char __user *arg) **/ void blk_trace_shutdown(struct request_queue *q) { + mutex_lock(&q->blk_trace_mutex); + if (q->blk_trace) { - blk_trace_startstop(q, 0); - blk_trace_remove(q); + __blk_trace_startstop(q, 0); + __blk_trace_remove(q); } + + mutex_unlock(&q->blk_trace_mutex); } #ifdef CONFIG_BLK_CGROUP @@ -1558,9 +1611,7 @@ static int blk_trace_remove_queue(struct request_queue *q) if (bt == NULL) return -EINVAL; - if (atomic_dec_and_test(&blk_probes_ref)) - blk_unregister_tracepoints(); - + put_probe_ref(); blk_trace_free(bt); return 0; } @@ -1591,8 +1642,7 @@ static int blk_trace_setup_queue(struct request_queue *q, if (cmpxchg(&q->blk_trace, NULL, bt)) goto free_bt; - if (atomic_inc_return(&blk_probes_ref) == 1) - blk_register_tracepoints(); + get_probe_ref(); return 0; free_bt: diff --git a/mm/backing-dev.c b/mm/backing-dev.c index e19606b..74b52df 100644 --- a/mm/backing-dev.c +++ b/mm/backing-dev.c @@ -1072,23 +1072,3 @@ out: return ret; } EXPORT_SYMBOL(wait_iff_congested); - -int pdflush_proc_obsolete(struct ctl_table *table, int write, - void __user *buffer, size_t *lenp, loff_t *ppos) -{ - char kbuf[] = "0\n"; - - if (*ppos || *lenp < sizeof(kbuf)) { - *lenp = 0; - return 0; - } - - if (copy_to_user(buffer, kbuf, sizeof(kbuf))) - return -EFAULT; - pr_warn_once("%s exported in /proc is scheduled for removal\n", - table->procname); - - *lenp = 2; - *ppos += *lenp; - return 2; -} diff --git a/mm/page-writeback.c b/mm/page-writeback.c index 0b9c5cb..c518c84 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -1972,31 +1972,31 @@ bool wb_over_bg_thresh(struct bdi_writeback *wb) int dirty_writeback_centisecs_handler(struct ctl_table *table, int write, void __user *buffer, size_t *length, loff_t *ppos) { - proc_dointvec(table, write, buffer, length, ppos); - return 0; + unsigned int old_interval = dirty_writeback_interval; + int ret; + + ret = proc_dointvec(table, write, buffer, length, ppos); + + /* + * Writing 0 to dirty_writeback_interval will disable periodic writeback + * and a different non-zero value will wakeup the writeback threads. + * wb_wakeup_delayed() would be more appropriate, but it's a pain to + * iterate over all bdis and wbs. + * The reason we do this is to make the change take effect immediately. + */ + if (!ret && write && dirty_writeback_interval && + dirty_writeback_interval != old_interval) + wakeup_flusher_threads(WB_REASON_PERIODIC); + + return ret; } #ifdef CONFIG_BLOCK void laptop_mode_timer_fn(unsigned long data) { struct request_queue *q = (struct request_queue *)data; - int nr_pages = global_node_page_state(NR_FILE_DIRTY) + - global_node_page_state(NR_UNSTABLE_NFS); - struct bdi_writeback *wb; - /* - * We want to write everything out, not just down to the dirty - * threshold - */ - if (!bdi_has_dirty_io(q->backing_dev_info)) - return; - - rcu_read_lock(); - list_for_each_entry_rcu(wb, &q->backing_dev_info->wb_list, bdi_node) - if (wb_has_dirty_io(wb)) - wb_start_writeback(wb, nr_pages, true, - WB_REASON_LAPTOP_TIMER); - rcu_read_unlock(); + wakeup_flusher_threads_bdi(q->backing_dev_info, WB_REASON_LAPTOP_TIMER); } /* diff --git a/mm/page_io.c b/mm/page_io.c index 5d882de..cd52b9c 100644 --- a/mm/page_io.c +++ b/mm/page_io.c @@ -408,7 +408,7 @@ int swap_readpage(struct page *page, bool do_poll) if (!READ_ONCE(bio->bi_private)) break; - if (!blk_mq_poll(disk->queue, qc)) + if (!blk_poll(disk->queue, qc)) break; } __set_current_state(TASK_RUNNING); diff --git a/mm/vmscan.c b/mm/vmscan.c index eb2f031..15b483e 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -1868,7 +1868,7 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec, * also allow kswapd to start writing pages during reclaim. */ if (stat.nr_unqueued_dirty == nr_taken) { - wakeup_flusher_threads(0, WB_REASON_VMSCAN); + wakeup_flusher_threads(WB_REASON_VMSCAN); set_bit(PGDAT_DIRTY, &pgdat->flags); } |
