From 4e68a011428af3211facd932b4003b3fa3ef4faa Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Wed, 14 Sep 2016 16:18:52 +0200 Subject: blk-mq: don't redistribute hardware queues on a CPU hotplug event Currently blk-mq will totally remap hardware context when a CPU hotplug even happened, which causes major havoc for drivers, as they are never told about this remapping. E.g. any carefully sorted out CPU affinity will just be completely messed up. The rebuild also doesn't really help for the common case of cpu hotplug, which is soft onlining / offlining of cpus - in this case we should just leave the queue and irq mapping as is. If it actually worked it would have helped in the case of physical cpu hotplug, although for that we'd need a way to actually notify the driver. Note that drivers may already be able to accommodate such a topology change on their own, e.g. using the reset_controller sysfs file in NVMe will cause the driver to get things right for this case. With the rebuild removed we will simplify retain the queue mapping for a soft offlined CPU that will work when it comes back online, and will map any newly onlined CPU to queue 0 until the driver initiates a rebuild of the queue map. Signed-off-by: Christoph Hellwig Reviewed-by: Keith Busch Signed-off-by: Jens Axboe --- block/blk-mq.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/block/blk-mq.c b/block/blk-mq.c index 7ddc796..ffc9d4a 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -2157,8 +2157,6 @@ static void blk_mq_queue_reinit(struct request_queue *q, blk_mq_sysfs_unregister(q); - blk_mq_update_queue_map(q->mq_map, q->nr_hw_queues, online_mask); - /* * 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 -- cgit v1.1 From bdd17e75cd97c5c39feee409890a91d0396640fe Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Wed, 14 Sep 2016 16:18:53 +0200 Subject: blk-mq: only allocate a single mq_map per tag_set The mapping is identical for all queues in a tag_set, so stop wasting memory for building multiple. Note that for now I've kept the mq_map pointer in the request_queue, but we'll need to investigate if we can remove it without suffering too much from the additional pointer chasing. The same would apply to the mq_ops pointer as well. Signed-off-by: Christoph Hellwig Reviewed-by: Keith Busch Signed-off-by: Jens Axboe --- block/blk-mq.c | 22 ++++++++++++++-------- include/linux/blk-mq.h | 1 + 2 files changed, 15 insertions(+), 8 deletions(-) diff --git a/block/blk-mq.c b/block/blk-mq.c index ffc9d4a..c9499f1 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -1973,7 +1973,6 @@ void blk_mq_release(struct request_queue *q) kfree(hctx); } - kfree(q->mq_map); q->mq_map = NULL; kfree(q->queue_hw_ctx); @@ -2072,9 +2071,7 @@ struct request_queue *blk_mq_init_allocated_queue(struct blk_mq_tag_set *set, if (!q->queue_hw_ctx) goto err_percpu; - q->mq_map = blk_mq_make_queue_map(set); - if (!q->mq_map) - goto err_map; + q->mq_map = set->mq_map; blk_mq_realloc_hw_ctxs(set, q); if (!q->nr_hw_queues) @@ -2124,8 +2121,6 @@ struct request_queue *blk_mq_init_allocated_queue(struct blk_mq_tag_set *set, return q; err_hctxs: - kfree(q->mq_map); -err_map: kfree(q->queue_hw_ctx); err_percpu: free_percpu(q->queue_ctx); @@ -2347,14 +2342,22 @@ int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set) if (!set->tags) return -ENOMEM; + set->mq_map = blk_mq_make_queue_map(set); + if (!set->mq_map) + goto out_free_tags; + if (blk_mq_alloc_rq_maps(set)) - goto enomem; + goto out_free_mq_map; mutex_init(&set->tag_list_lock); INIT_LIST_HEAD(&set->tag_list); return 0; -enomem: + +out_free_mq_map: + kfree(set->mq_map); + set->mq_map = NULL; +out_free_tags: kfree(set->tags); set->tags = NULL; return -ENOMEM; @@ -2370,6 +2373,9 @@ void blk_mq_free_tag_set(struct blk_mq_tag_set *set) blk_mq_free_rq_map(set, set->tags[i], i); } + kfree(set->mq_map); + set->mq_map = NULL; + kfree(set->tags); set->tags = NULL; } diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h index 60ef14c..deda16a 100644 --- a/include/linux/blk-mq.h +++ b/include/linux/blk-mq.h @@ -67,6 +67,7 @@ struct blk_mq_hw_ctx { }; struct blk_mq_tag_set { + unsigned int *mq_map; struct blk_mq_ops *ops; unsigned int nr_hw_queues; unsigned int queue_depth; /* max hw supported */ -- cgit v1.1 From 7d7e0f90b70f6c5367c2d1c9a7e87dd228bd0816 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Wed, 14 Sep 2016 16:18:54 +0200 Subject: blk-mq: remove ->map_queue All drivers use the default, so provide an inline version of it. If we ever need other queue mapping we can add an optional method back, although supporting will also require major changes to the queue setup code. This provides better code generation, and better debugability as well. Signed-off-by: Christoph Hellwig Reviewed-by: Keith Busch Signed-off-by: Jens Axboe --- block/blk-flush.c | 6 +++--- block/blk-mq-tag.c | 5 ++--- block/blk-mq.c | 40 +++++++++++---------------------------- block/blk-mq.h | 6 ++++++ block/blk.h | 11 +++-------- drivers/block/loop.c | 1 - drivers/block/mtip32xx/mtip32xx.c | 1 - drivers/block/null_blk.c | 1 - drivers/block/rbd.c | 1 - drivers/block/virtio_blk.c | 1 - drivers/block/xen-blkfront.c | 1 - drivers/md/dm-rq.c | 1 - drivers/mtd/ubi/block.c | 1 - drivers/nvme/host/pci.c | 2 -- drivers/nvme/host/rdma.c | 2 -- drivers/nvme/target/loop.c | 2 -- drivers/scsi/scsi_lib.c | 1 - include/linux/blk-mq.h | 7 ------- 18 files changed, 25 insertions(+), 65 deletions(-) diff --git a/block/blk-flush.c b/block/blk-flush.c index d308def..6a14b68 100644 --- a/block/blk-flush.c +++ b/block/blk-flush.c @@ -232,7 +232,7 @@ static void flush_end_io(struct request *flush_rq, int error) /* release the tag's ownership to the req cloned from */ spin_lock_irqsave(&fq->mq_flush_lock, flags); - hctx = q->mq_ops->map_queue(q, flush_rq->mq_ctx->cpu); + 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; } @@ -325,7 +325,7 @@ static bool blk_kick_flush(struct request_queue *q, struct blk_flush_queue *fq) flush_rq->tag = first_rq->tag; fq->orig_rq = first_rq; - hctx = q->mq_ops->map_queue(q, first_rq->mq_ctx->cpu); + hctx = blk_mq_map_queue(q, first_rq->mq_ctx->cpu); blk_mq_tag_set_rq(hctx, first_rq->tag, flush_rq); } @@ -358,7 +358,7 @@ static void mq_flush_data_end_io(struct request *rq, int error) unsigned long flags; struct blk_flush_queue *fq = blk_get_flush_queue(q, ctx); - hctx = q->mq_ops->map_queue(q, ctx->cpu); + hctx = blk_mq_map_queue(q, ctx->cpu); /* * After populating an empty queue, kick it to avoid stall. Read diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c index 729bac3..1602813 100644 --- a/block/blk-mq-tag.c +++ b/block/blk-mq-tag.c @@ -301,8 +301,7 @@ static int bt_get(struct blk_mq_alloc_data *data, io_schedule(); data->ctx = blk_mq_get_ctx(data->q); - data->hctx = data->q->mq_ops->map_queue(data->q, - data->ctx->cpu); + data->hctx = blk_mq_map_queue(data->q, data->ctx->cpu); if (data->flags & BLK_MQ_REQ_RESERVED) { bt = &data->hctx->tags->breserved_tags; } else { @@ -726,7 +725,7 @@ u32 blk_mq_unique_tag(struct request *rq) int hwq = 0; if (q->mq_ops) { - hctx = q->mq_ops->map_queue(q, rq->mq_ctx->cpu); + hctx = blk_mq_map_queue(q, rq->mq_ctx->cpu); hwq = hctx->queue_num; } diff --git a/block/blk-mq.c b/block/blk-mq.c index c9499f1..6e077a9 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -245,7 +245,7 @@ struct request *blk_mq_alloc_request(struct request_queue *q, int rw, return ERR_PTR(ret); ctx = blk_mq_get_ctx(q); - hctx = q->mq_ops->map_queue(q, ctx->cpu); + hctx = blk_mq_map_queue(q, ctx->cpu); blk_mq_set_alloc_data(&alloc_data, q, flags, ctx, hctx); rq = __blk_mq_alloc_request(&alloc_data, rw, 0); @@ -254,7 +254,7 @@ struct request *blk_mq_alloc_request(struct request_queue *q, int rw, blk_mq_put_ctx(ctx); ctx = blk_mq_get_ctx(q); - hctx = q->mq_ops->map_queue(q, ctx->cpu); + hctx = blk_mq_map_queue(q, ctx->cpu); blk_mq_set_alloc_data(&alloc_data, q, flags, ctx, hctx); rq = __blk_mq_alloc_request(&alloc_data, rw, 0); ctx = alloc_data.ctx; @@ -338,11 +338,7 @@ EXPORT_SYMBOL_GPL(blk_mq_free_hctx_request); void blk_mq_free_request(struct request *rq) { - struct blk_mq_hw_ctx *hctx; - struct request_queue *q = rq->q; - - hctx = q->mq_ops->map_queue(q, rq->mq_ctx->cpu); - blk_mq_free_hctx_request(hctx, rq); + blk_mq_free_hctx_request(blk_mq_map_queue(rq->q, rq->mq_ctx->cpu), rq); } EXPORT_SYMBOL_GPL(blk_mq_free_request); @@ -1074,9 +1070,7 @@ void blk_mq_insert_request(struct request *rq, bool at_head, bool run_queue, { struct blk_mq_ctx *ctx = rq->mq_ctx; struct request_queue *q = rq->q; - struct blk_mq_hw_ctx *hctx; - - hctx = q->mq_ops->map_queue(q, ctx->cpu); + struct blk_mq_hw_ctx *hctx = blk_mq_map_queue(q, ctx->cpu); spin_lock(&ctx->lock); __blk_mq_insert_request(hctx, rq, at_head); @@ -1093,12 +1087,10 @@ static void blk_mq_insert_requests(struct request_queue *q, bool from_schedule) { - struct blk_mq_hw_ctx *hctx; + struct blk_mq_hw_ctx *hctx = blk_mq_map_queue(q, ctx->cpu); trace_block_unplug(q, depth, !from_schedule); - hctx = q->mq_ops->map_queue(q, ctx->cpu); - /* * preemption doesn't flush plug list, so it's possible ctx->cpu is * offline now @@ -1232,7 +1224,7 @@ static struct request *blk_mq_map_request(struct request_queue *q, blk_queue_enter_live(q); ctx = blk_mq_get_ctx(q); - hctx = q->mq_ops->map_queue(q, ctx->cpu); + hctx = blk_mq_map_queue(q, ctx->cpu); if (rw_is_sync(bio_op(bio), bio->bi_opf)) op_flags |= REQ_SYNC; @@ -1246,7 +1238,7 @@ static struct request *blk_mq_map_request(struct request_queue *q, trace_block_sleeprq(q, bio, op); ctx = blk_mq_get_ctx(q); - hctx = q->mq_ops->map_queue(q, ctx->cpu); + hctx = blk_mq_map_queue(q, ctx->cpu); blk_mq_set_alloc_data(&alloc_data, q, 0, ctx, hctx); rq = __blk_mq_alloc_request(&alloc_data, op, op_flags); ctx = alloc_data.ctx; @@ -1263,8 +1255,7 @@ static int blk_mq_direct_issue_request(struct request *rq, blk_qc_t *cookie) { int ret; struct request_queue *q = rq->q; - struct blk_mq_hw_ctx *hctx = q->mq_ops->map_queue(q, - rq->mq_ctx->cpu); + struct blk_mq_hw_ctx *hctx = blk_mq_map_queue(q, rq->mq_ctx->cpu); struct blk_mq_queue_data bd = { .rq = rq, .list = NULL, @@ -1468,15 +1459,6 @@ run_queue: return cookie; } -/* - * Default mapping to a software queue, since we use one per CPU. - */ -struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *q, const int cpu) -{ - return q->queue_hw_ctx[q->mq_map[cpu]]; -} -EXPORT_SYMBOL(blk_mq_map_queue); - static void blk_mq_free_rq_map(struct blk_mq_tag_set *set, struct blk_mq_tags *tags, unsigned int hctx_idx) { @@ -1810,7 +1792,7 @@ static void blk_mq_init_cpu_queues(struct request_queue *q, if (!cpu_online(i)) continue; - hctx = q->mq_ops->map_queue(q, i); + hctx = blk_mq_map_queue(q, i); /* * Set local node, IFF we have more than one hw queue. If @@ -1848,7 +1830,7 @@ static void blk_mq_map_swqueue(struct request_queue *q, continue; ctx = per_cpu_ptr(q->queue_ctx, i); - hctx = q->mq_ops->map_queue(q, i); + hctx = blk_mq_map_queue(q, i); cpumask_set_cpu(i, hctx->cpumask); ctx->index_hw = hctx->nr_ctx; @@ -2313,7 +2295,7 @@ int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set) if (set->queue_depth < set->reserved_tags + BLK_MQ_TAG_MIN) return -EINVAL; - if (!set->ops->queue_rq || !set->ops->map_queue) + if (!set->ops->queue_rq) return -EINVAL; if (set->queue_depth > BLK_MQ_MAX_DEPTH) { diff --git a/block/blk-mq.h b/block/blk-mq.h index 9087b11..ec774bf 100644 --- a/block/blk-mq.h +++ b/block/blk-mq.h @@ -52,6 +52,12 @@ extern int blk_mq_update_queue_map(unsigned int *map, unsigned int nr_queues, const struct cpumask *online_mask); extern int blk_mq_hw_queue_to_node(unsigned int *map, unsigned int); +static inline struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *q, + int cpu) +{ + return q->queue_hw_ctx[q->mq_map[cpu]]; +} + /* * sysfs helpers */ diff --git a/block/blk.h b/block/blk.h index c37492f..74444c4 100644 --- a/block/blk.h +++ b/block/blk.h @@ -39,14 +39,9 @@ extern struct ida blk_queue_ida; static inline struct blk_flush_queue *blk_get_flush_queue( struct request_queue *q, struct blk_mq_ctx *ctx) { - struct blk_mq_hw_ctx *hctx; - - if (!q->mq_ops) - return q->fq; - - hctx = q->mq_ops->map_queue(q, ctx->cpu); - - return hctx->fq; + if (q->mq_ops) + return blk_mq_map_queue(q, ctx->cpu)->fq; + return q->fq; } static inline void __blk_get_queue(struct request_queue *q) diff --git a/drivers/block/loop.c b/drivers/block/loop.c index c9f2107..cbdb3b1 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -1703,7 +1703,6 @@ static int loop_init_request(void *data, struct request *rq, static struct blk_mq_ops loop_mq_ops = { .queue_rq = loop_queue_rq, - .map_queue = blk_mq_map_queue, .init_request = loop_init_request, }; diff --git a/drivers/block/mtip32xx/mtip32xx.c b/drivers/block/mtip32xx/mtip32xx.c index 88c4685..3cfd879 100644 --- a/drivers/block/mtip32xx/mtip32xx.c +++ b/drivers/block/mtip32xx/mtip32xx.c @@ -3895,7 +3895,6 @@ exit_handler: static struct blk_mq_ops mtip_mq_ops = { .queue_rq = mtip_queue_rq, - .map_queue = blk_mq_map_queue, .init_request = mtip_init_cmd, .exit_request = mtip_free_cmd, .complete = mtip_softirq_done_fn, diff --git a/drivers/block/null_blk.c b/drivers/block/null_blk.c index 75a7f88..7d3b7d6 100644 --- a/drivers/block/null_blk.c +++ b/drivers/block/null_blk.c @@ -393,7 +393,6 @@ static int null_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, static struct blk_mq_ops null_mq_ops = { .queue_rq = null_queue_rq, - .map_queue = blk_mq_map_queue, .init_hctx = null_init_hctx, .complete = null_softirq_done_fn, }; diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c index 6c6519f..c1f84df 100644 --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -3621,7 +3621,6 @@ static int rbd_init_request(void *data, struct request *rq, static struct blk_mq_ops rbd_mq_ops = { .queue_rq = rbd_queue_rq, - .map_queue = blk_mq_map_queue, .init_request = rbd_init_request, }; diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c index 93b1aaa..2dc5c96 100644 --- a/drivers/block/virtio_blk.c +++ b/drivers/block/virtio_blk.c @@ -542,7 +542,6 @@ static int virtblk_init_request(void *data, struct request *rq, static struct blk_mq_ops virtio_mq_ops = { .queue_rq = virtio_queue_rq, - .map_queue = blk_mq_map_queue, .complete = virtblk_request_done, .init_request = virtblk_init_request, }; diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c index 88ef6d4..9908597 100644 --- a/drivers/block/xen-blkfront.c +++ b/drivers/block/xen-blkfront.c @@ -909,7 +909,6 @@ out_busy: static struct blk_mq_ops blkfront_mq_ops = { .queue_rq = blkif_queue_rq, - .map_queue = blk_mq_map_queue, }; static void blkif_set_queue_limits(struct blkfront_info *info) diff --git a/drivers/md/dm-rq.c b/drivers/md/dm-rq.c index 1ca7463..d1c3645 100644 --- a/drivers/md/dm-rq.c +++ b/drivers/md/dm-rq.c @@ -908,7 +908,6 @@ static int dm_mq_queue_rq(struct blk_mq_hw_ctx *hctx, static struct blk_mq_ops dm_mq_ops = { .queue_rq = dm_mq_queue_rq, - .map_queue = blk_mq_map_queue, .complete = dm_softirq_done, .init_request = dm_mq_init_request, }; diff --git a/drivers/mtd/ubi/block.c b/drivers/mtd/ubi/block.c index ebf46ad..d1e6931 100644 --- a/drivers/mtd/ubi/block.c +++ b/drivers/mtd/ubi/block.c @@ -351,7 +351,6 @@ static int ubiblock_init_request(void *data, struct request *req, static struct blk_mq_ops ubiblock_mq_ops = { .queue_rq = ubiblock_queue_rq, .init_request = ubiblock_init_request, - .map_queue = blk_mq_map_queue, }; static DEFINE_IDR(ubiblock_minor_idr); diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index 8dcf5a9..086fd7e 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -1131,7 +1131,6 @@ static int nvme_create_queue(struct nvme_queue *nvmeq, int qid) static struct blk_mq_ops nvme_mq_admin_ops = { .queue_rq = nvme_queue_rq, .complete = nvme_complete_rq, - .map_queue = blk_mq_map_queue, .init_hctx = nvme_admin_init_hctx, .exit_hctx = nvme_admin_exit_hctx, .init_request = nvme_admin_init_request, @@ -1141,7 +1140,6 @@ static struct blk_mq_ops nvme_mq_admin_ops = { static struct blk_mq_ops nvme_mq_ops = { .queue_rq = nvme_queue_rq, .complete = nvme_complete_rq, - .map_queue = blk_mq_map_queue, .init_hctx = nvme_init_hctx, .init_request = nvme_init_request, .timeout = nvme_timeout, diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c index ab545fb..9bbd886 100644 --- a/drivers/nvme/host/rdma.c +++ b/drivers/nvme/host/rdma.c @@ -1531,7 +1531,6 @@ static void nvme_rdma_complete_rq(struct request *rq) static struct blk_mq_ops nvme_rdma_mq_ops = { .queue_rq = nvme_rdma_queue_rq, .complete = nvme_rdma_complete_rq, - .map_queue = blk_mq_map_queue, .init_request = nvme_rdma_init_request, .exit_request = nvme_rdma_exit_request, .reinit_request = nvme_rdma_reinit_request, @@ -1543,7 +1542,6 @@ static struct blk_mq_ops nvme_rdma_mq_ops = { static struct blk_mq_ops nvme_rdma_admin_mq_ops = { .queue_rq = nvme_rdma_queue_rq, .complete = nvme_rdma_complete_rq, - .map_queue = blk_mq_map_queue, .init_request = nvme_rdma_init_admin_request, .exit_request = nvme_rdma_exit_admin_request, .reinit_request = nvme_rdma_reinit_request, diff --git a/drivers/nvme/target/loop.c b/drivers/nvme/target/loop.c index 395e60d..d5df77d 100644 --- a/drivers/nvme/target/loop.c +++ b/drivers/nvme/target/loop.c @@ -273,7 +273,6 @@ static int nvme_loop_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data, static struct blk_mq_ops nvme_loop_mq_ops = { .queue_rq = nvme_loop_queue_rq, .complete = nvme_loop_complete_rq, - .map_queue = blk_mq_map_queue, .init_request = nvme_loop_init_request, .init_hctx = nvme_loop_init_hctx, .timeout = nvme_loop_timeout, @@ -282,7 +281,6 @@ static struct blk_mq_ops nvme_loop_mq_ops = { static struct blk_mq_ops nvme_loop_admin_mq_ops = { .queue_rq = nvme_loop_queue_rq, .complete = nvme_loop_complete_rq, - .map_queue = blk_mq_map_queue, .init_request = nvme_loop_init_admin_request, .init_hctx = nvme_loop_init_admin_hctx, .timeout = nvme_loop_timeout, diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index c71344a..2cca9cf 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -2077,7 +2077,6 @@ struct request_queue *scsi_alloc_queue(struct scsi_device *sdev) } static struct blk_mq_ops scsi_mq_ops = { - .map_queue = blk_mq_map_queue, .queue_rq = scsi_queue_rq, .complete = scsi_softirq_done, .timeout = scsi_timeout, diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h index deda16a..f01379f 100644 --- a/include/linux/blk-mq.h +++ b/include/linux/blk-mq.h @@ -91,7 +91,6 @@ struct blk_mq_queue_data { }; typedef int (queue_rq_fn)(struct blk_mq_hw_ctx *, const struct blk_mq_queue_data *); -typedef struct blk_mq_hw_ctx *(map_queue_fn)(struct request_queue *, const int); 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); @@ -114,11 +113,6 @@ struct blk_mq_ops { queue_rq_fn *queue_rq; /* - * Map to specific hardware queue - */ - map_queue_fn *map_queue; - - /* * Called on request timeout */ timeout_fn *timeout; @@ -223,7 +217,6 @@ static inline u16 blk_mq_unique_tag_to_tag(u32 unique_tag) return unique_tag & BLK_MQ_UNIQUE_TAG_MASK; } -struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *, const int ctx_index); int blk_mq_request_started(struct request *rq); void blk_mq_start_request(struct request *rq); -- cgit v1.1 From da695ba236b993f07a540d35c17f271ef08c89f3 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Wed, 14 Sep 2016 16:18:55 +0200 Subject: blk-mq: allow the driver to pass in a queue mapping This allows drivers specify their own queue mapping by overriding the setup-time function that builds the mq_map. This can be used for example to build the map based on the MSI-X vector mapping provided by the core interrupt layer for PCI devices. Signed-off-by: Christoph Hellwig Reviewed-by: Keith Busch Signed-off-by: Jens Axboe --- block/blk-mq-cpumap.c | 25 +++++-------------------- block/blk-mq.c | 18 +++++++++++++++--- block/blk-mq.h | 4 +--- include/linux/blk-mq.h | 3 +++ 4 files changed, 24 insertions(+), 26 deletions(-) diff --git a/block/blk-mq-cpumap.c b/block/blk-mq-cpumap.c index d0634bc..19b1d9c 100644 --- a/block/blk-mq-cpumap.c +++ b/block/blk-mq-cpumap.c @@ -31,14 +31,16 @@ static int get_first_sibling(unsigned int cpu) return cpu; } -int blk_mq_update_queue_map(unsigned int *map, unsigned int nr_queues, - const struct cpumask *online_mask) +int blk_mq_map_queues(struct blk_mq_tag_set *set) { + unsigned int *map = set->mq_map; + unsigned int nr_queues = set->nr_hw_queues; + const struct cpumask *online_mask = cpu_online_mask; unsigned int i, nr_cpus, nr_uniq_cpus, queue, first_sibling; cpumask_var_t cpus; if (!alloc_cpumask_var(&cpus, GFP_ATOMIC)) - return 1; + return -ENOMEM; cpumask_clear(cpus); nr_cpus = nr_uniq_cpus = 0; @@ -86,23 +88,6 @@ int blk_mq_update_queue_map(unsigned int *map, unsigned int nr_queues, return 0; } -unsigned int *blk_mq_make_queue_map(struct blk_mq_tag_set *set) -{ - unsigned int *map; - - /* If cpus are offline, map them to first hctx */ - map = kzalloc_node(sizeof(*map) * nr_cpu_ids, GFP_KERNEL, - set->numa_node); - if (!map) - return NULL; - - if (!blk_mq_update_queue_map(map, set->nr_hw_queues, cpu_online_mask)) - return map; - - kfree(map); - return NULL; -} - /* * We have no quick way of doing reverse lookups. This is only used at * queue init time, so runtime isn't important. diff --git a/block/blk-mq.c b/block/blk-mq.c index 6e077a9..a306007 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -2286,6 +2286,8 @@ EXPORT_SYMBOL_GPL(blk_mq_tags_cpumask); */ int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set) { + int ret; + BUILD_BUG_ON(BLK_MQ_MAX_DEPTH > 1 << BLK_MQ_UNIQUE_TAG_BITS); if (!set->nr_hw_queues) @@ -2324,11 +2326,21 @@ int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set) if (!set->tags) return -ENOMEM; - set->mq_map = blk_mq_make_queue_map(set); + ret = -ENOMEM; + set->mq_map = kzalloc_node(sizeof(*set->mq_map) * nr_cpu_ids, + GFP_KERNEL, set->numa_node); if (!set->mq_map) goto out_free_tags; - if (blk_mq_alloc_rq_maps(set)) + if (set->ops->map_queues) + ret = set->ops->map_queues(set); + else + ret = blk_mq_map_queues(set); + if (ret) + goto out_free_mq_map; + + ret = blk_mq_alloc_rq_maps(set); + if (ret) goto out_free_mq_map; mutex_init(&set->tag_list_lock); @@ -2342,7 +2354,7 @@ out_free_mq_map: out_free_tags: kfree(set->tags); set->tags = NULL; - return -ENOMEM; + return ret; } EXPORT_SYMBOL(blk_mq_alloc_tag_set); diff --git a/block/blk-mq.h b/block/blk-mq.h index ec774bf..c92bb7d 100644 --- a/block/blk-mq.h +++ b/block/blk-mq.h @@ -47,9 +47,7 @@ void blk_mq_disable_hotplug(void); /* * CPU -> queue mappings */ -extern unsigned int *blk_mq_make_queue_map(struct blk_mq_tag_set *set); -extern int blk_mq_update_queue_map(unsigned int *map, unsigned int nr_queues, - const struct cpumask *online_mask); +int blk_mq_map_queues(struct blk_mq_tag_set *set); extern int blk_mq_hw_queue_to_node(unsigned int *map, unsigned int); static inline struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *q, diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h index f01379f..6737fd7 100644 --- a/include/linux/blk-mq.h +++ b/include/linux/blk-mq.h @@ -104,6 +104,7 @@ typedef void (busy_iter_fn)(struct blk_mq_hw_ctx *, struct request *, void *, bool); typedef void (busy_tag_iter_fn)(struct request *, void *, bool); typedef int (poll_fn)(struct blk_mq_hw_ctx *, unsigned int); +typedef int (map_queues_fn)(struct blk_mq_tag_set *set); struct blk_mq_ops { @@ -144,6 +145,8 @@ struct blk_mq_ops { init_request_fn *init_request; exit_request_fn *exit_request; reinit_request_fn *reinit_request; + + map_queues_fn *map_queues; }; enum { -- cgit v1.1 From 973c4e372c8f71a15ac39765e657ded70fc87d41 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Wed, 14 Sep 2016 16:18:56 +0200 Subject: blk-mq: provide a default queue mapping for PCI device Signed-off-by: Christoph Hellwig Reviewed-by: Keith Busch Signed-off-by: Jens Axboe --- block/Makefile | 2 +- block/blk-mq-pci.c | 45 +++++++++++++++++++++++++++++++++++++++++++++ include/linux/blk-mq-pci.h | 9 +++++++++ 3 files changed, 55 insertions(+), 1 deletion(-) create mode 100644 block/blk-mq-pci.c create mode 100644 include/linux/blk-mq-pci.h diff --git a/block/Makefile b/block/Makefile index 9eda232..2447a0b 100644 --- a/block/Makefile +++ b/block/Makefile @@ -22,4 +22,4 @@ obj-$(CONFIG_IOSCHED_CFQ) += cfq-iosched.o obj-$(CONFIG_BLOCK_COMPAT) += compat_ioctl.o obj-$(CONFIG_BLK_CMDLINE_PARSER) += cmdline-parser.o obj-$(CONFIG_BLK_DEV_INTEGRITY) += bio-integrity.o blk-integrity.o t10-pi.o - +obj-$(CONFIG_PCI) += blk-mq-pci.o diff --git a/block/blk-mq-pci.c b/block/blk-mq-pci.c new file mode 100644 index 0000000..33c7bd7 --- /dev/null +++ b/block/blk-mq-pci.c @@ -0,0 +1,45 @@ +/* + * Copyright (c) 2016 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 +#include +#include +#include + +/** + * blk_mq_pci_map_queues - provide a default queue mapping for PCI device + * @set: tagset to provide the mapping for + * @pdev: PCI device associated with @set. + * + * This function assumes the PCI device @pdev has at least as many available + * interrupt vetors as @set has queues. It will then queuery the vector + * corresponding to each queue for it's affinity mask and built queue mapping + * that maps a queue to the CPUs that have irq affinity for the corresponding + * vector. + */ +int blk_mq_pci_map_queues(struct blk_mq_tag_set *set, struct pci_dev *pdev) +{ + const struct cpumask *mask; + unsigned int queue, cpu; + + for (queue = 0; queue < set->nr_hw_queues; queue++) { + mask = pci_irq_get_affinity(pdev, queue); + if (!mask) + return -EINVAL; + + for_each_cpu(cpu, mask) + set->mq_map[cpu] = queue; + } + + return 0; +} +EXPORT_SYMBOL_GPL(blk_mq_pci_map_queues); diff --git a/include/linux/blk-mq-pci.h b/include/linux/blk-mq-pci.h new file mode 100644 index 0000000..6ab5952 --- /dev/null +++ b/include/linux/blk-mq-pci.h @@ -0,0 +1,9 @@ +#ifndef _LINUX_BLK_MQ_PCI_H +#define _LINUX_BLK_MQ_PCI_H + +struct blk_mq_tag_set; +struct pci_dev; + +int blk_mq_pci_map_queues(struct blk_mq_tag_set *set, struct pci_dev *pdev); + +#endif /* _LINUX_BLK_MQ_PCI_H */ -- cgit v1.1 From dca51e7892fa3bc545023f9f0d004a2db69eb2a1 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Wed, 14 Sep 2016 16:18:57 +0200 Subject: nvme: switch to use pci_alloc_irq_vectors Use the new helper to automatically select the right interrupt type, as well as to use the automatic interupt affinity assignment. Signed-off-by: Christoph Hellwig Reviewed-by: Keith Busch Signed-off-by: Jens Axboe --- drivers/nvme/host/pci.c | 107 ++++++++++++++++-------------------------------- 1 file changed, 36 insertions(+), 71 deletions(-) diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index 086fd7e..47a44e9 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -16,6 +16,7 @@ #include #include #include +#include #include #include #include @@ -88,7 +89,6 @@ struct nvme_dev { unsigned max_qid; int q_depth; u32 db_stride; - struct msix_entry *entry; void __iomem *bar; struct work_struct reset_work; struct work_struct remove_work; @@ -201,6 +201,11 @@ static unsigned int nvme_cmd_size(struct nvme_dev *dev) nvme_iod_alloc_size(dev, NVME_INT_BYTES(dev), NVME_INT_PAGES); } +static int nvmeq_irq(struct nvme_queue *nvmeq) +{ + return pci_irq_vector(to_pci_dev(nvmeq->dev->dev), nvmeq->cq_vector); +} + static int nvme_admin_init_hctx(struct blk_mq_hw_ctx *hctx, void *data, unsigned int hctx_idx) { @@ -263,6 +268,13 @@ static int nvme_init_request(void *data, struct request *req, return 0; } +static int nvme_pci_map_queues(struct blk_mq_tag_set *set) +{ + struct nvme_dev *dev = set->driver_data; + + return blk_mq_pci_map_queues(set, to_pci_dev(dev->dev)); +} + /** * __nvme_submit_cmd() - Copy a command into a queue and ring the doorbell * @nvmeq: The queue to use @@ -960,7 +972,7 @@ static int nvme_suspend_queue(struct nvme_queue *nvmeq) spin_unlock_irq(&nvmeq->q_lock); return 1; } - vector = nvmeq->dev->entry[nvmeq->cq_vector].vector; + vector = nvmeq_irq(nvmeq); nvmeq->dev->online_queues--; nvmeq->cq_vector = -1; spin_unlock_irq(&nvmeq->q_lock); @@ -968,7 +980,6 @@ static int nvme_suspend_queue(struct nvme_queue *nvmeq) if (!nvmeq->qid && nvmeq->dev->ctrl.admin_q) blk_mq_stop_hw_queues(nvmeq->dev->ctrl.admin_q); - irq_set_affinity_hint(vector, NULL); free_irq(vector, nvmeq); return 0; @@ -1075,15 +1086,14 @@ static struct nvme_queue *nvme_alloc_queue(struct nvme_dev *dev, int qid, return NULL; } -static int queue_request_irq(struct nvme_dev *dev, struct nvme_queue *nvmeq, - const char *name) +static int queue_request_irq(struct nvme_queue *nvmeq) { if (use_threaded_interrupts) - return request_threaded_irq(dev->entry[nvmeq->cq_vector].vector, - nvme_irq_check, nvme_irq, IRQF_SHARED, - name, nvmeq); - return request_irq(dev->entry[nvmeq->cq_vector].vector, nvme_irq, - IRQF_SHARED, name, nvmeq); + return request_threaded_irq(nvmeq_irq(nvmeq), nvme_irq_check, + nvme_irq, IRQF_SHARED, nvmeq->irqname, nvmeq); + else + return request_irq(nvmeq_irq(nvmeq), nvme_irq, IRQF_SHARED, + nvmeq->irqname, nvmeq); } static void nvme_init_queue(struct nvme_queue *nvmeq, u16 qid) @@ -1114,7 +1124,7 @@ static int nvme_create_queue(struct nvme_queue *nvmeq, int qid) if (result < 0) goto release_cq; - result = queue_request_irq(dev, nvmeq, nvmeq->irqname); + result = queue_request_irq(nvmeq); if (result < 0) goto release_sq; @@ -1142,6 +1152,7 @@ static struct blk_mq_ops nvme_mq_ops = { .complete = nvme_complete_rq, .init_hctx = nvme_init_hctx, .init_request = nvme_init_request, + .map_queues = nvme_pci_map_queues, .timeout = nvme_timeout, .poll = nvme_poll, }; @@ -1232,7 +1243,7 @@ static int nvme_configure_admin_queue(struct nvme_dev *dev) goto free_nvmeq; nvmeq->cq_vector = 0; - result = queue_request_irq(dev, nvmeq, nvmeq->irqname); + result = queue_request_irq(nvmeq); if (result) { nvmeq->cq_vector = -1; goto free_nvmeq; @@ -1380,7 +1391,7 @@ static int nvme_setup_io_queues(struct nvme_dev *dev) { struct nvme_queue *adminq = dev->queues[0]; struct pci_dev *pdev = to_pci_dev(dev->dev); - int result, i, vecs, nr_io_queues, size; + int result, nr_io_queues, size; nr_io_queues = num_online_cpus(); result = nvme_set_queue_count(&dev->ctrl, &nr_io_queues); @@ -1415,29 +1426,18 @@ static int nvme_setup_io_queues(struct nvme_dev *dev) } /* Deregister the admin queue's interrupt */ - free_irq(dev->entry[0].vector, adminq); + free_irq(pci_irq_vector(pdev, 0), adminq); /* * If we enable msix early due to not intx, disable it again before * setting up the full range we need. */ - if (pdev->msi_enabled) - pci_disable_msi(pdev); - else if (pdev->msix_enabled) - pci_disable_msix(pdev); - - for (i = 0; i < nr_io_queues; i++) - dev->entry[i].entry = i; - vecs = pci_enable_msix_range(pdev, dev->entry, 1, nr_io_queues); - if (vecs < 0) { - vecs = pci_enable_msi_range(pdev, 1, min(nr_io_queues, 32)); - if (vecs < 0) { - vecs = 1; - } else { - for (i = 0; i < vecs; i++) - dev->entry[i].vector = i + pdev->irq; - } - } + pci_free_irq_vectors(pdev); + nr_io_queues = pci_alloc_irq_vectors(pdev, 1, nr_io_queues, + PCI_IRQ_ALL_TYPES | PCI_IRQ_AFFINITY); + if (nr_io_queues <= 0) + return -EIO; + dev->max_qid = nr_io_queues; /* * Should investigate if there's a performance win from allocating @@ -1445,10 +1445,8 @@ static int nvme_setup_io_queues(struct nvme_dev *dev) * path to scale better, even if the receive path is limited by the * number of interrupts. */ - nr_io_queues = vecs; - dev->max_qid = nr_io_queues; - result = queue_request_irq(dev, adminq, adminq->irqname); + result = queue_request_irq(adminq); if (result) { adminq->cq_vector = -1; goto free_queues; @@ -1460,23 +1458,6 @@ static int nvme_setup_io_queues(struct nvme_dev *dev) return result; } -static void nvme_pci_post_scan(struct nvme_ctrl *ctrl) -{ - struct nvme_dev *dev = to_nvme_dev(ctrl); - struct nvme_queue *nvmeq; - int i; - - for (i = 0; i < dev->online_queues; i++) { - nvmeq = dev->queues[i]; - - if (!nvmeq->tags || !(*nvmeq->tags)) - continue; - - irq_set_affinity_hint(dev->entry[nvmeq->cq_vector].vector, - blk_mq_tags_cpumask(*nvmeq->tags)); - } -} - static void nvme_del_queue_end(struct request *req, int error) { struct nvme_queue *nvmeq = req->end_io_data; @@ -1613,15 +1594,9 @@ static int nvme_pci_enable(struct nvme_dev *dev) * interrupts. Pre-enable a single MSIX or MSI vec for setup. We'll * adjust this later. */ - if (pci_enable_msix(pdev, dev->entry, 1)) { - pci_enable_msi(pdev); - dev->entry[0].vector = pdev->irq; - } - - if (!dev->entry[0].vector) { - result = -ENODEV; - goto disable; - } + result = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_ALL_TYPES); + if (result < 0) + return result; cap = lo_hi_readq(dev->bar + NVME_REG_CAP); @@ -1663,10 +1638,7 @@ static void nvme_pci_disable(struct nvme_dev *dev) { struct pci_dev *pdev = to_pci_dev(dev->dev); - if (pdev->msi_enabled) - pci_disable_msi(pdev); - else if (pdev->msix_enabled) - pci_disable_msix(pdev); + pci_free_irq_vectors(pdev); if (pci_is_enabled(pdev)) { pci_disable_pcie_error_reporting(pdev); @@ -1736,7 +1708,6 @@ static void nvme_pci_free_ctrl(struct nvme_ctrl *ctrl) if (dev->ctrl.admin_q) blk_put_queue(dev->ctrl.admin_q); kfree(dev->queues); - kfree(dev->entry); kfree(dev); } @@ -1880,7 +1851,6 @@ static const struct nvme_ctrl_ops nvme_pci_ctrl_ops = { .reg_read64 = nvme_pci_reg_read64, .reset_ctrl = nvme_pci_reset_ctrl, .free_ctrl = nvme_pci_free_ctrl, - .post_scan = nvme_pci_post_scan, .submit_async_event = nvme_pci_submit_async_event, }; @@ -1913,10 +1883,6 @@ static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id) dev = kzalloc_node(sizeof(*dev), GFP_KERNEL, node); if (!dev) return -ENOMEM; - dev->entry = kzalloc_node(num_possible_cpus() * sizeof(*dev->entry), - GFP_KERNEL, node); - if (!dev->entry) - goto free; dev->queues = kzalloc_node((num_possible_cpus() + 1) * sizeof(void *), GFP_KERNEL, node); if (!dev->queues) @@ -1957,7 +1923,6 @@ static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id) nvme_dev_unmap(dev); free: kfree(dev->queues); - kfree(dev->entry); kfree(dev); return result; } -- cgit v1.1 From b5af7f2ff022a75eb0bbf2166007c4b8ddd02ef1 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Wed, 14 Sep 2016 16:18:58 +0200 Subject: nvme: remove the post_scan callout No need now that we don't have to reverse engineer the irq affinity. Signed-off-by: Christoph Hellwig Reviewed-by: Keith Busch Signed-off-by: Jens Axboe --- drivers/nvme/host/core.c | 3 --- drivers/nvme/host/nvme.h | 1 - 2 files changed, 4 deletions(-) diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 2feacc7..b245616 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -1826,9 +1826,6 @@ static void nvme_scan_work(struct work_struct *work) list_sort(NULL, &ctrl->namespaces, ns_cmp); mutex_unlock(&ctrl->namespaces_mutex); kfree(id); - - if (ctrl->ops->post_scan) - ctrl->ops->post_scan(ctrl); } void nvme_queue_scan(struct nvme_ctrl *ctrl) diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h index ab18b78..99e4c16 100644 --- a/drivers/nvme/host/nvme.h +++ b/drivers/nvme/host/nvme.h @@ -184,7 +184,6 @@ struct nvme_ctrl_ops { int (*reg_read64)(struct nvme_ctrl *ctrl, u32 off, u64 *val); int (*reset_ctrl)(struct nvme_ctrl *ctrl); void (*free_ctrl)(struct nvme_ctrl *ctrl); - void (*post_scan)(struct nvme_ctrl *ctrl); void (*submit_async_event)(struct nvme_ctrl *ctrl, int aer_idx); int (*delete_ctrl)(struct nvme_ctrl *ctrl); const char *(*get_subsysnqn)(struct nvme_ctrl *ctrl); -- cgit v1.1 From 1b157939f92ae22d10b9d52baaa14f826927f5ff Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Wed, 14 Sep 2016 16:18:59 +0200 Subject: blk-mq: get rid of the cpumask in struct blk_mq_tags Unused now that NVMe sets up irq affinity before calling into blk-mq. Signed-off-by: Christoph Hellwig Reviewed-by: Keith Busch Signed-off-by: Jens Axboe --- block/blk-mq-tag.c | 6 ------ block/blk-mq-tag.h | 1 - block/blk-mq.c | 25 +++++++++++++++++++++---- include/linux/blk-mq.h | 1 - 4 files changed, 21 insertions(+), 12 deletions(-) diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c index 1602813..2eae3d5 100644 --- a/block/blk-mq-tag.c +++ b/block/blk-mq-tag.c @@ -665,11 +665,6 @@ struct blk_mq_tags *blk_mq_init_tags(unsigned int total_tags, if (!tags) return NULL; - if (!zalloc_cpumask_var(&tags->cpumask, GFP_KERNEL)) { - kfree(tags); - return NULL; - } - tags->nr_tags = total_tags; tags->nr_reserved_tags = reserved_tags; @@ -680,7 +675,6 @@ void blk_mq_free_tags(struct blk_mq_tags *tags) { bt_free(&tags->bitmap_tags); bt_free(&tags->breserved_tags); - free_cpumask_var(tags->cpumask); kfree(tags); } diff --git a/block/blk-mq-tag.h b/block/blk-mq-tag.h index d468a79..5569641 100644 --- a/block/blk-mq-tag.h +++ b/block/blk-mq-tag.h @@ -44,7 +44,6 @@ struct blk_mq_tags { struct list_head page_list; int alloc_policy; - cpumask_var_t cpumask; }; diff --git a/block/blk-mq.c b/block/blk-mq.c index a306007..060b350 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -1861,7 +1861,6 @@ static void blk_mq_map_swqueue(struct request_queue *q, hctx->tags = set->tags[i]; WARN_ON(!hctx->tags); - cpumask_copy(hctx->tags->cpumask, hctx->cpumask); /* * Set the map size to the number of mapped software queues. * This is more accurate and more efficient than looping @@ -2272,11 +2271,29 @@ static int blk_mq_alloc_rq_maps(struct blk_mq_tag_set *set) return 0; } -struct cpumask *blk_mq_tags_cpumask(struct blk_mq_tags *tags) +static int blk_mq_create_mq_map(struct blk_mq_tag_set *set, + const struct cpumask *affinity_mask) { - return tags->cpumask; + int queue = -1, cpu = 0; + + set->mq_map = kzalloc_node(sizeof(*set->mq_map) * nr_cpu_ids, + GFP_KERNEL, set->numa_node); + if (!set->mq_map) + return -ENOMEM; + + if (!affinity_mask) + return 0; /* map all cpus to queue 0 */ + + /* If cpus are offline, map them to first hctx */ + for_each_online_cpu(cpu) { + if (cpumask_test_cpu(cpu, affinity_mask)) + queue++; + if (queue >= 0) + set->mq_map[cpu] = queue; + } + + return 0; } -EXPORT_SYMBOL_GPL(blk_mq_tags_cpumask); /* * Alloc a tag set to be associated with one or more request queues. diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h index 6737fd7..c5a97d7 100644 --- a/include/linux/blk-mq.h +++ b/include/linux/blk-mq.h @@ -201,7 +201,6 @@ struct request *blk_mq_alloc_request(struct request_queue *q, int rw, struct request *blk_mq_alloc_request_hctx(struct request_queue *q, int op, unsigned int flags, unsigned int hctx_idx); struct request *blk_mq_tag_to_rq(struct blk_mq_tags *tags, unsigned int tag); -struct cpumask *blk_mq_tags_cpumask(struct blk_mq_tags *tags); enum { BLK_MQ_UNIQUE_TAG_BITS = 16, -- cgit v1.1 From 9151bcb4fb38aab04cdc67cc3b3e11396db1b8b4 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Thu, 15 Sep 2016 08:45:45 -0600 Subject: blk-mq: kill unused blk_mq_create_mq_map() Fixes 1b157939f92a ("blk-mq: get rid of the cpumask in struct blk_mq_tags") Signed-off-by: Jens Axboe --- block/blk-mq.c | 24 ------------------------ 1 file changed, 24 deletions(-) diff --git a/block/blk-mq.c b/block/blk-mq.c index 060b350..f1c5263 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -2271,30 +2271,6 @@ static int blk_mq_alloc_rq_maps(struct blk_mq_tag_set *set) return 0; } -static int blk_mq_create_mq_map(struct blk_mq_tag_set *set, - const struct cpumask *affinity_mask) -{ - int queue = -1, cpu = 0; - - set->mq_map = kzalloc_node(sizeof(*set->mq_map) * nr_cpu_ids, - GFP_KERNEL, set->numa_node); - if (!set->mq_map) - return -ENOMEM; - - if (!affinity_mask) - return 0; /* map all cpus to queue 0 */ - - /* If cpus are offline, map them to first hctx */ - for_each_online_cpu(cpu) { - if (cpumask_test_cpu(cpu, affinity_mask)) - queue++; - if (queue >= 0) - set->mq_map[cpu] = queue; - } - - return 0; -} - /* * Alloc a tag set to be associated with one or more request queues. * May fail with EINVAL for various error conditions. May adjust the -- cgit v1.1 From 8ec2ef2b66ea2fd00acc28aca8edaad441dbb424 Mon Sep 17 00:00:00 2001 From: Stephen Rothwell Date: Mon, 19 Sep 2016 15:50:16 +1000 Subject: blk_mq: linux/blk-mq.h does not include all the headers it depends on and building block/blk-mq-pci.o should depend on CONFIG_BLOCK Fixes: 973c4e372c8f ("blk-mq: provide a default queue mapping for PCI device") Signed-off-by: Stephen Rothwell Reviewed-by: Christoph Hellwig Signed-off-by: Jens Axboe --- block/Kconfig | 5 +++++ block/Makefile | 2 +- block/blk-mq-pci.c | 2 ++ 3 files changed, 8 insertions(+), 1 deletion(-) diff --git a/block/Kconfig b/block/Kconfig index 161491d..5155338 100644 --- a/block/Kconfig +++ b/block/Kconfig @@ -124,4 +124,9 @@ config BLOCK_COMPAT depends on BLOCK && COMPAT default y +config BLK_MQ_PCI + bool + depends on BLOCK && PCI + default y + source block/Kconfig.iosched diff --git a/block/Makefile b/block/Makefile index 2447a0b..37a0d93 100644 --- a/block/Makefile +++ b/block/Makefile @@ -22,4 +22,4 @@ obj-$(CONFIG_IOSCHED_CFQ) += cfq-iosched.o obj-$(CONFIG_BLOCK_COMPAT) += compat_ioctl.o obj-$(CONFIG_BLK_CMDLINE_PARSER) += cmdline-parser.o obj-$(CONFIG_BLK_DEV_INTEGRITY) += bio-integrity.o blk-integrity.o t10-pi.o -obj-$(CONFIG_PCI) += blk-mq-pci.o +obj-$(CONFIG_BLK_MQ_PCI) += blk-mq-pci.o diff --git a/block/blk-mq-pci.c b/block/blk-mq-pci.c index 33c7bd7..966c216 100644 --- a/block/blk-mq-pci.c +++ b/block/blk-mq-pci.c @@ -10,6 +10,8 @@ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for * more details. */ +#include +#include #include #include #include -- cgit v1.1