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authorChristoph Hellwig <hch@lst.de>2014-04-15 14:14:00 -0600
committerJens Axboe <axboe@fb.com>2014-04-15 14:18:02 -0600
commit24d2f90309b23f2cfe016b2aebc5f0d6e01c57fd (patch)
tree10307829129eb8f96facbb89fefbba3c0032fb46 /block
parented44832dea8a74f909e0187f350201402927f5e5 (diff)
downloadop-kernel-dev-24d2f90309b23f2cfe016b2aebc5f0d6e01c57fd.zip
op-kernel-dev-24d2f90309b23f2cfe016b2aebc5f0d6e01c57fd.tar.gz
blk-mq: split out tag initialization, support shared tags
Add a new blk_mq_tag_set structure that gets set up before we initialize the queue. A single blk_mq_tag_set structure can be shared by multiple queues. Signed-off-by: Christoph Hellwig <hch@lst.de> Modular export of blk_mq_{alloc,free}_tagset added by me. Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block')
-rw-r--r--block/blk-mq-cpumap.c6
-rw-r--r--block/blk-mq-tag.c14
-rw-r--r--block/blk-mq-tag.h19
-rw-r--r--block/blk-mq.c244
-rw-r--r--block/blk-mq.h5
5 files changed, 160 insertions, 128 deletions
diff --git a/block/blk-mq-cpumap.c b/block/blk-mq-cpumap.c
index 09792132..5d0f93c 100644
--- a/block/blk-mq-cpumap.c
+++ b/block/blk-mq-cpumap.c
@@ -80,17 +80,17 @@ 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_reg *reg)
+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) * num_possible_cpus(), GFP_KERNEL,
- reg->numa_node);
+ set->numa_node);
if (!map)
return NULL;
- if (!blk_mq_update_queue_map(map, reg->nr_hw_queues))
+ if (!blk_mq_update_queue_map(map, set->nr_hw_queues))
return map;
kfree(map);
diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c
index 83ae96c..7a799c4 100644
--- a/block/blk-mq-tag.c
+++ b/block/blk-mq-tag.c
@@ -1,25 +1,11 @@
#include <linux/kernel.h>
#include <linux/module.h>
-#include <linux/percpu_ida.h>
#include <linux/blk-mq.h>
#include "blk.h"
#include "blk-mq.h"
#include "blk-mq-tag.h"
-/*
- * Per tagged queue (tag address space) map
- */
-struct blk_mq_tags {
- unsigned int nr_tags;
- unsigned int nr_reserved_tags;
- unsigned int nr_batch_move;
- unsigned int nr_max_cache;
-
- struct percpu_ida free_tags;
- struct percpu_ida reserved_tags;
-};
-
void blk_mq_wait_for_tags(struct blk_mq_tags *tags)
{
int tag = blk_mq_get_tag(tags, __GFP_WAIT, false);
diff --git a/block/blk-mq-tag.h b/block/blk-mq-tag.h
index 947ba2c..b602e3f 100644
--- a/block/blk-mq-tag.h
+++ b/block/blk-mq-tag.h
@@ -1,7 +1,24 @@
#ifndef INT_BLK_MQ_TAG_H
#define INT_BLK_MQ_TAG_H
-struct blk_mq_tags;
+#include <linux/percpu_ida.h>
+
+/*
+ * Tag address space map.
+ */
+struct blk_mq_tags {
+ unsigned int nr_tags;
+ unsigned int nr_reserved_tags;
+ unsigned int nr_batch_move;
+ unsigned int nr_max_cache;
+
+ struct percpu_ida free_tags;
+ struct percpu_ida reserved_tags;
+
+ struct request **rqs;
+ struct list_head page_list;
+};
+
extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags, unsigned int reserved_tags, int node);
extern void blk_mq_free_tags(struct blk_mq_tags *tags);
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 2a5a0fe..9180052 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -81,7 +81,7 @@ static struct request *__blk_mq_alloc_request(struct blk_mq_hw_ctx *hctx,
tag = blk_mq_get_tag(hctx->tags, gfp, reserved);
if (tag != BLK_MQ_TAG_FAIL) {
- rq = hctx->rqs[tag];
+ rq = hctx->tags->rqs[tag];
blk_rq_init(hctx->queue, rq);
rq->tag = tag;
@@ -404,6 +404,12 @@ static void blk_mq_requeue_request(struct request *rq)
rq->nr_phys_segments--;
}
+struct request *blk_mq_tag_to_rq(struct blk_mq_tags *tags, unsigned int tag)
+{
+ return tags->rqs[tag];
+}
+EXPORT_SYMBOL(blk_mq_tag_to_rq);
+
struct blk_mq_timeout_data {
struct blk_mq_hw_ctx *hctx;
unsigned long *next;
@@ -425,12 +431,13 @@ static void blk_mq_timeout_check(void *__data, unsigned long *free_tags)
do {
struct request *rq;
- tag = find_next_zero_bit(free_tags, hctx->queue_depth, tag);
- if (tag >= hctx->queue_depth)
+ tag = find_next_zero_bit(free_tags, hctx->tags->nr_tags, tag);
+ if (tag >= hctx->tags->nr_tags)
break;
- rq = hctx->rqs[tag++];
-
+ rq = blk_mq_tag_to_rq(hctx->tags, tag++);
+ if (rq->q != hctx->queue)
+ continue;
if (!test_bit(REQ_ATOM_STARTED, &rq->atomic_flags))
continue;
@@ -969,11 +976,11 @@ struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *q, const int cpu)
}
EXPORT_SYMBOL(blk_mq_map_queue);
-struct blk_mq_hw_ctx *blk_mq_alloc_single_hw_queue(struct blk_mq_reg *reg,
+struct blk_mq_hw_ctx *blk_mq_alloc_single_hw_queue(struct blk_mq_tag_set *set,
unsigned int hctx_index)
{
return kmalloc_node(sizeof(struct blk_mq_hw_ctx),
- GFP_KERNEL | __GFP_ZERO, reg->numa_node);
+ GFP_KERNEL | __GFP_ZERO, set->numa_node);
}
EXPORT_SYMBOL(blk_mq_alloc_single_hw_queue);
@@ -1030,31 +1037,31 @@ static void blk_mq_hctx_notify(void *data, unsigned long action,
blk_mq_put_ctx(ctx);
}
-static void blk_mq_free_rq_map(struct blk_mq_hw_ctx *hctx, void *driver_data)
+static void blk_mq_free_rq_map(struct blk_mq_tag_set *set,
+ struct blk_mq_tags *tags, unsigned int hctx_idx)
{
struct page *page;
- if (hctx->rqs && hctx->queue->mq_ops->exit_request) {
+ if (tags->rqs && set->ops->exit_request) {
int i;
- for (i = 0; i < hctx->queue_depth; i++) {
- if (!hctx->rqs[i])
+ for (i = 0; i < tags->nr_tags; i++) {
+ if (!tags->rqs[i])
continue;
- hctx->queue->mq_ops->exit_request(driver_data, hctx,
- hctx->rqs[i], i);
+ set->ops->exit_request(set->driver_data, tags->rqs[i],
+ hctx_idx, i);
}
}
- while (!list_empty(&hctx->page_list)) {
- page = list_first_entry(&hctx->page_list, struct page, lru);
+ while (!list_empty(&tags->page_list)) {
+ page = list_first_entry(&tags->page_list, struct page, lru);
list_del_init(&page->lru);
__free_pages(page, page->private);
}
- kfree(hctx->rqs);
+ kfree(tags->rqs);
- if (hctx->tags)
- blk_mq_free_tags(hctx->tags);
+ blk_mq_free_tags(tags);
}
static size_t order_to_size(unsigned int order)
@@ -1067,30 +1074,36 @@ static size_t order_to_size(unsigned int order)
return ret;
}
-static int blk_mq_init_rq_map(struct blk_mq_hw_ctx *hctx,
- struct blk_mq_reg *reg, void *driver_data, int node)
+static struct blk_mq_tags *blk_mq_init_rq_map(struct blk_mq_tag_set *set,
+ unsigned int hctx_idx)
{
- unsigned int reserved_tags = reg->reserved_tags;
+ struct blk_mq_tags *tags;
unsigned int i, j, entries_per_page, max_order = 4;
size_t rq_size, left;
- int error;
- INIT_LIST_HEAD(&hctx->page_list);
+ tags = blk_mq_init_tags(set->queue_depth, set->reserved_tags,
+ set->numa_node);
+ if (!tags)
+ return NULL;
- hctx->rqs = kmalloc_node(hctx->queue_depth * sizeof(struct request *),
- GFP_KERNEL, node);
- if (!hctx->rqs)
- return -ENOMEM;
+ INIT_LIST_HEAD(&tags->page_list);
+
+ tags->rqs = kmalloc_node(set->queue_depth * sizeof(struct request *),
+ GFP_KERNEL, set->numa_node);
+ if (!tags->rqs) {
+ blk_mq_free_tags(tags);
+ return NULL;
+ }
/*
* rq_size is the size of the request plus driver payload, rounded
* to the cacheline size
*/
- rq_size = round_up(sizeof(struct request) + hctx->cmd_size,
+ rq_size = round_up(sizeof(struct request) + set->cmd_size,
cache_line_size());
- left = rq_size * hctx->queue_depth;
+ left = rq_size * set->queue_depth;
- for (i = 0; i < hctx->queue_depth;) {
+ for (i = 0; i < set->queue_depth; ) {
int this_order = max_order;
struct page *page;
int to_do;
@@ -1100,7 +1113,8 @@ static int blk_mq_init_rq_map(struct blk_mq_hw_ctx *hctx,
this_order--;
do {
- page = alloc_pages_node(node, GFP_KERNEL, this_order);
+ page = alloc_pages_node(set->numa_node, GFP_KERNEL,
+ this_order);
if (page)
break;
if (!this_order--)
@@ -1110,22 +1124,22 @@ static int blk_mq_init_rq_map(struct blk_mq_hw_ctx *hctx,
} while (1);
if (!page)
- break;
+ goto fail;
page->private = this_order;
- list_add_tail(&page->lru, &hctx->page_list);
+ list_add_tail(&page->lru, &tags->page_list);
p = page_address(page);
entries_per_page = order_to_size(this_order) / rq_size;
- to_do = min(entries_per_page, hctx->queue_depth - i);
+ to_do = min(entries_per_page, set->queue_depth - i);
left -= to_do * rq_size;
for (j = 0; j < to_do; j++) {
- hctx->rqs[i] = p;
- if (reg->ops->init_request) {
- error = reg->ops->init_request(driver_data,
- hctx, hctx->rqs[i], i);
- if (error)
- goto err_rq_map;
+ tags->rqs[i] = p;
+ if (set->ops->init_request) {
+ if (set->ops->init_request(set->driver_data,
+ tags->rqs[i], hctx_idx, i,
+ set->numa_node))
+ goto fail;
}
p += rq_size;
@@ -1133,30 +1147,16 @@ static int blk_mq_init_rq_map(struct blk_mq_hw_ctx *hctx,
}
}
- if (i < (reserved_tags + BLK_MQ_TAG_MIN)) {
- error = -ENOMEM;
- goto err_rq_map;
- }
- if (i != hctx->queue_depth) {
- hctx->queue_depth = i;
- pr_warn("%s: queue depth set to %u because of low memory\n",
- __func__, i);
- }
+ return tags;
- hctx->tags = blk_mq_init_tags(hctx->queue_depth, reserved_tags, node);
- if (!hctx->tags) {
- error = -ENOMEM;
- goto err_rq_map;
- }
-
- return 0;
-err_rq_map:
- blk_mq_free_rq_map(hctx, driver_data);
- return error;
+fail:
+ pr_warn("%s: failed to allocate requests\n", __func__);
+ blk_mq_free_rq_map(set, tags, hctx_idx);
+ return NULL;
}
static int blk_mq_init_hw_queues(struct request_queue *q,
- struct blk_mq_reg *reg, void *driver_data)
+ struct blk_mq_tag_set *set)
{
struct blk_mq_hw_ctx *hctx;
unsigned int i, j;
@@ -1170,23 +1170,21 @@ static int blk_mq_init_hw_queues(struct request_queue *q,
node = hctx->numa_node;
if (node == NUMA_NO_NODE)
- node = hctx->numa_node = reg->numa_node;
+ node = hctx->numa_node = set->numa_node;
INIT_DELAYED_WORK(&hctx->delayed_work, blk_mq_work_fn);
spin_lock_init(&hctx->lock);
INIT_LIST_HEAD(&hctx->dispatch);
hctx->queue = q;
hctx->queue_num = i;
- hctx->flags = reg->flags;
- hctx->queue_depth = reg->queue_depth;
- hctx->cmd_size = reg->cmd_size;
+ hctx->flags = set->flags;
+ hctx->cmd_size = set->cmd_size;
blk_mq_init_cpu_notifier(&hctx->cpu_notifier,
blk_mq_hctx_notify, hctx);
blk_mq_register_cpu_notifier(&hctx->cpu_notifier);
- if (blk_mq_init_rq_map(hctx, reg, driver_data, node))
- break;
+ hctx->tags = set->tags[i];
/*
* Allocate space for all possible cpus to avoid allocation in
@@ -1206,8 +1204,8 @@ static int blk_mq_init_hw_queues(struct request_queue *q,
hctx->nr_ctx_map = num_maps;
hctx->nr_ctx = 0;
- if (reg->ops->init_hctx &&
- reg->ops->init_hctx(hctx, driver_data, i))
+ if (set->ops->init_hctx &&
+ set->ops->init_hctx(hctx, set->driver_data, i))
break;
}
@@ -1221,11 +1219,10 @@ static int blk_mq_init_hw_queues(struct request_queue *q,
if (i == j)
break;
- if (reg->ops->exit_hctx)
- reg->ops->exit_hctx(hctx, j);
+ if (set->ops->exit_hctx)
+ set->ops->exit_hctx(hctx, j);
blk_mq_unregister_cpu_notifier(&hctx->cpu_notifier);
- blk_mq_free_rq_map(hctx, driver_data);
kfree(hctx->ctxs);
}
@@ -1290,41 +1287,25 @@ static void blk_mq_map_swqueue(struct request_queue *q)
}
}
-struct request_queue *blk_mq_init_queue(struct blk_mq_reg *reg,
- void *driver_data)
+struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *set)
{
struct blk_mq_hw_ctx **hctxs;
struct blk_mq_ctx *ctx;
struct request_queue *q;
int i;
- if (!reg->nr_hw_queues ||
- !reg->ops->queue_rq || !reg->ops->map_queue ||
- !reg->ops->alloc_hctx || !reg->ops->free_hctx)
- return ERR_PTR(-EINVAL);
-
- if (!reg->queue_depth)
- reg->queue_depth = BLK_MQ_MAX_DEPTH;
- else if (reg->queue_depth > BLK_MQ_MAX_DEPTH) {
- pr_err("blk-mq: queuedepth too large (%u)\n", reg->queue_depth);
- reg->queue_depth = BLK_MQ_MAX_DEPTH;
- }
-
- if (reg->queue_depth < (reg->reserved_tags + BLK_MQ_TAG_MIN))
- return ERR_PTR(-EINVAL);
-
ctx = alloc_percpu(struct blk_mq_ctx);
if (!ctx)
return ERR_PTR(-ENOMEM);
- hctxs = kmalloc_node(reg->nr_hw_queues * sizeof(*hctxs), GFP_KERNEL,
- reg->numa_node);
+ hctxs = kmalloc_node(set->nr_hw_queues * sizeof(*hctxs), GFP_KERNEL,
+ set->numa_node);
if (!hctxs)
goto err_percpu;
- for (i = 0; i < reg->nr_hw_queues; i++) {
- hctxs[i] = reg->ops->alloc_hctx(reg, i);
+ for (i = 0; i < set->nr_hw_queues; i++) {
+ hctxs[i] = set->ops->alloc_hctx(set, i);
if (!hctxs[i])
goto err_hctxs;
@@ -1335,11 +1316,11 @@ struct request_queue *blk_mq_init_queue(struct blk_mq_reg *reg,
hctxs[i]->queue_num = i;
}
- q = blk_alloc_queue_node(GFP_KERNEL, reg->numa_node);
+ q = blk_alloc_queue_node(GFP_KERNEL, set->numa_node);
if (!q)
goto err_hctxs;
- q->mq_map = blk_mq_make_queue_map(reg);
+ q->mq_map = blk_mq_make_queue_map(set);
if (!q->mq_map)
goto err_map;
@@ -1347,33 +1328,34 @@ struct request_queue *blk_mq_init_queue(struct blk_mq_reg *reg,
blk_queue_rq_timeout(q, 30000);
q->nr_queues = nr_cpu_ids;
- q->nr_hw_queues = reg->nr_hw_queues;
+ q->nr_hw_queues = set->nr_hw_queues;
q->queue_ctx = ctx;
q->queue_hw_ctx = hctxs;
- q->mq_ops = reg->ops;
+ q->mq_ops = set->ops;
q->queue_flags |= QUEUE_FLAG_MQ_DEFAULT;
q->sg_reserved_size = INT_MAX;
blk_queue_make_request(q, blk_mq_make_request);
- blk_queue_rq_timed_out(q, reg->ops->timeout);
- if (reg->timeout)
- blk_queue_rq_timeout(q, reg->timeout);
+ blk_queue_rq_timed_out(q, set->ops->timeout);
+ if (set->timeout)
+ blk_queue_rq_timeout(q, set->timeout);
- if (reg->ops->complete)
- blk_queue_softirq_done(q, reg->ops->complete);
+ if (set->ops->complete)
+ blk_queue_softirq_done(q, set->ops->complete);
blk_mq_init_flush(q);
- blk_mq_init_cpu_queues(q, reg->nr_hw_queues);
+ blk_mq_init_cpu_queues(q, set->nr_hw_queues);
- q->flush_rq = kzalloc(round_up(sizeof(struct request) + reg->cmd_size,
- cache_line_size()), GFP_KERNEL);
+ q->flush_rq = kzalloc(round_up(sizeof(struct request) +
+ set->cmd_size, cache_line_size()),
+ GFP_KERNEL);
if (!q->flush_rq)
goto err_hw;
- if (blk_mq_init_hw_queues(q, reg, driver_data))
+ if (blk_mq_init_hw_queues(q, set))
goto err_flush_rq;
blk_mq_map_swqueue(q);
@@ -1391,11 +1373,11 @@ err_hw:
err_map:
blk_cleanup_queue(q);
err_hctxs:
- for (i = 0; i < reg->nr_hw_queues; i++) {
+ for (i = 0; i < set->nr_hw_queues; i++) {
if (!hctxs[i])
break;
free_cpumask_var(hctxs[i]->cpumask);
- reg->ops->free_hctx(hctxs[i], i);
+ set->ops->free_hctx(hctxs[i], i);
}
kfree(hctxs);
err_percpu:
@@ -1412,7 +1394,6 @@ void blk_mq_free_queue(struct request_queue *q)
queue_for_each_hw_ctx(q, hctx, i) {
kfree(hctx->ctx_map);
kfree(hctx->ctxs);
- blk_mq_free_rq_map(hctx, q->queuedata);
blk_mq_unregister_cpu_notifier(&hctx->cpu_notifier);
if (q->mq_ops->exit_hctx)
q->mq_ops->exit_hctx(hctx, i);
@@ -1473,6 +1454,53 @@ static int blk_mq_queue_reinit_notify(struct notifier_block *nb,
return NOTIFY_OK;
}
+int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set)
+{
+ int i;
+
+ if (!set->nr_hw_queues)
+ return -EINVAL;
+ if (!set->queue_depth || set->queue_depth > BLK_MQ_MAX_DEPTH)
+ return -EINVAL;
+ if (set->queue_depth < set->reserved_tags + BLK_MQ_TAG_MIN)
+ return -EINVAL;
+
+ if (!set->nr_hw_queues ||
+ !set->ops->queue_rq || !set->ops->map_queue ||
+ !set->ops->alloc_hctx || !set->ops->free_hctx)
+ return -EINVAL;
+
+
+ set->tags = kmalloc_node(set->nr_hw_queues * sizeof(struct blk_mq_tags),
+ GFP_KERNEL, set->numa_node);
+ if (!set->tags)
+ goto out;
+
+ for (i = 0; i < set->nr_hw_queues; i++) {
+ set->tags[i] = blk_mq_init_rq_map(set, i);
+ if (!set->tags[i])
+ goto out_unwind;
+ }
+
+ return 0;
+
+out_unwind:
+ while (--i >= 0)
+ blk_mq_free_rq_map(set, set->tags[i], i);
+out:
+ return -ENOMEM;
+}
+EXPORT_SYMBOL(blk_mq_alloc_tag_set);
+
+void blk_mq_free_tag_set(struct blk_mq_tag_set *set)
+{
+ int i;
+
+ for (i = 0; i < set->nr_hw_queues; i++)
+ blk_mq_free_rq_map(set, set->tags[i], i);
+}
+EXPORT_SYMBOL(blk_mq_free_tag_set);
+
void blk_mq_disable_hotplug(void)
{
mutex_lock(&all_q_mutex);
diff --git a/block/blk-mq.h b/block/blk-mq.h
index 7964dad..5fa14f1 100644
--- a/block/blk-mq.h
+++ b/block/blk-mq.h
@@ -1,6 +1,8 @@
#ifndef INT_BLK_MQ_H
#define INT_BLK_MQ_H
+struct blk_mq_tag_set;
+
struct blk_mq_ctx {
struct {
spinlock_t lock;
@@ -46,8 +48,7 @@ void blk_mq_disable_hotplug(void);
/*
* CPU -> queue mappings
*/
-struct blk_mq_reg;
-extern unsigned int *blk_mq_make_queue_map(struct blk_mq_reg *reg);
+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);
void blk_mq_add_timer(struct request *rq);
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