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-rw-r--r--block/blk-flush.c2
-rw-r--r--block/blk-mq-tag.c48
-rw-r--r--block/blk-mq-tag.h2
-rw-r--r--block/blk-mq.c83
-rw-r--r--block/blk-mq.h45
-rw-r--r--drivers/block/mtip32xx/mtip32xx.c4
-rw-r--r--include/linux/blk-mq.h2
-rw-r--r--include/linux/blkdev.h2
8 files changed, 123 insertions, 65 deletions
diff --git a/block/blk-flush.c b/block/blk-flush.c
index ff87c664b7df..8ffee4b5f93d 100644
--- a/block/blk-flush.c
+++ b/block/blk-flush.c
@@ -225,7 +225,7 @@ static void flush_end_io(struct request *flush_rq, int error)
if (q->mq_ops) {
spin_lock_irqsave(&q->mq_flush_lock, flags);
- q->flush_rq->cmd_flags = 0;
+ q->flush_rq->tag = -1;
}
running = &q->flush_queue[q->flush_running_idx];
diff --git a/block/blk-mq-tag.c b/block/blk-mq-tag.c
index d90c4aeb7dd3..1aab39f71d95 100644
--- a/block/blk-mq-tag.c
+++ b/block/blk-mq-tag.c
@@ -221,8 +221,10 @@ static struct bt_wait_state *bt_wait_ptr(struct blk_mq_bitmap_tags *bt,
return bs;
}
-static int bt_get(struct blk_mq_bitmap_tags *bt, struct blk_mq_hw_ctx *hctx,
- unsigned int *last_tag, gfp_t gfp)
+static int bt_get(struct blk_mq_alloc_data *data,
+ struct blk_mq_bitmap_tags *bt,
+ struct blk_mq_hw_ctx *hctx,
+ unsigned int *last_tag)
{
struct bt_wait_state *bs;
DEFINE_WAIT(wait);
@@ -232,7 +234,7 @@ static int bt_get(struct blk_mq_bitmap_tags *bt, struct blk_mq_hw_ctx *hctx,
if (tag != -1)
return tag;
- if (!(gfp & __GFP_WAIT))
+ if (!(data->gfp & __GFP_WAIT))
return -1;
bs = bt_wait_ptr(bt, hctx);
@@ -249,50 +251,62 @@ static int bt_get(struct blk_mq_bitmap_tags *bt, struct blk_mq_hw_ctx *hctx,
if (was_empty)
atomic_set(&bs->wait_cnt, bt->wake_cnt);
+ blk_mq_put_ctx(data->ctx);
+
io_schedule();
+
+ data->ctx = blk_mq_get_ctx(data->q);
+ data->hctx = data->q->mq_ops->map_queue(data->q,
+ data->ctx->cpu);
+ if (data->reserved) {
+ bt = &data->hctx->tags->breserved_tags;
+ } else {
+ last_tag = &data->ctx->last_tag;
+ hctx = data->hctx;
+ bt = &hctx->tags->bitmap_tags;
+ }
+ finish_wait(&bs->wait, &wait);
+ bs = bt_wait_ptr(bt, hctx);
} while (1);
finish_wait(&bs->wait, &wait);
return tag;
}
-static unsigned int __blk_mq_get_tag(struct blk_mq_tags *tags,
- struct blk_mq_hw_ctx *hctx,
- unsigned int *last_tag, gfp_t gfp)
+static unsigned int __blk_mq_get_tag(struct blk_mq_alloc_data *data)
{
int tag;
- tag = bt_get(&tags->bitmap_tags, hctx, last_tag, gfp);
+ tag = bt_get(data, &data->hctx->tags->bitmap_tags, data->hctx,
+ &data->ctx->last_tag);
if (tag >= 0)
- return tag + tags->nr_reserved_tags;
+ return tag + data->hctx->tags->nr_reserved_tags;
return BLK_MQ_TAG_FAIL;
}
-static unsigned int __blk_mq_get_reserved_tag(struct blk_mq_tags *tags,
- gfp_t gfp)
+static unsigned int __blk_mq_get_reserved_tag(struct blk_mq_alloc_data *data)
{
int tag, zero = 0;
- if (unlikely(!tags->nr_reserved_tags)) {
+ if (unlikely(!data->hctx->tags->nr_reserved_tags)) {
WARN_ON_ONCE(1);
return BLK_MQ_TAG_FAIL;
}
- tag = bt_get(&tags->breserved_tags, NULL, &zero, gfp);
+ tag = bt_get(data, &data->hctx->tags->breserved_tags, NULL, &zero);
if (tag < 0)
return BLK_MQ_TAG_FAIL;
return tag;
}
-unsigned int blk_mq_get_tag(struct blk_mq_hw_ctx *hctx, unsigned int *last_tag,
- gfp_t gfp, bool reserved)
+unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data)
{
- if (!reserved)
- return __blk_mq_get_tag(hctx->tags, hctx, last_tag, gfp);
+ if (!data->reserved)
+ return __blk_mq_get_tag(data);
- return __blk_mq_get_reserved_tag(hctx->tags, gfp);
+ return __blk_mq_get_reserved_tag(data);
}
static struct bt_wait_state *bt_wake_ptr(struct blk_mq_bitmap_tags *bt)
diff --git a/block/blk-mq-tag.h b/block/blk-mq-tag.h
index c959de58d2a5..98696a65d4d4 100644
--- a/block/blk-mq-tag.h
+++ b/block/blk-mq-tag.h
@@ -48,7 +48,7 @@ struct blk_mq_tags {
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);
-extern unsigned int blk_mq_get_tag(struct blk_mq_hw_ctx *hctx, unsigned int *last_tag, gfp_t gfp, bool reserved);
+extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data);
extern void blk_mq_put_tag(struct blk_mq_hw_ctx *hctx, unsigned int tag, unsigned int *last_tag);
extern bool blk_mq_has_free_tags(struct blk_mq_tags *tags);
extern ssize_t blk_mq_tag_sysfs_show(struct blk_mq_tags *tags, char *page);
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 0f5879c42dcd..4e4cd6208052 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -33,28 +33,6 @@ static LIST_HEAD(all_q_list);
static void __blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx);
-static struct blk_mq_ctx *__blk_mq_get_ctx(struct request_queue *q,
- unsigned int cpu)
-{
- return per_cpu_ptr(q->queue_ctx, cpu);
-}
-
-/*
- * This assumes per-cpu software queueing queues. They could be per-node
- * as well, for instance. For now this is hardcoded as-is. Note that we don't
- * care about preemption, since we know the ctx's are persistent. This does
- * mean that we can't rely on ctx always matching the currently running CPU.
- */
-static struct blk_mq_ctx *blk_mq_get_ctx(struct request_queue *q)
-{
- return __blk_mq_get_ctx(q, get_cpu());
-}
-
-static void blk_mq_put_ctx(struct blk_mq_ctx *ctx)
-{
- put_cpu();
-}
-
/*
* Check if any of the ctx's have pending work in this hardware queue
*/
@@ -232,24 +210,23 @@ static void blk_mq_rq_ctx_init(struct request_queue *q, struct blk_mq_ctx *ctx,
}
static struct request *
-__blk_mq_alloc_request(struct request_queue *q, struct blk_mq_hw_ctx *hctx,
- struct blk_mq_ctx *ctx, int rw, gfp_t gfp, bool reserved)
+__blk_mq_alloc_request(struct blk_mq_alloc_data *data, int rw)
{
struct request *rq;
unsigned int tag;
- tag = blk_mq_get_tag(hctx, &ctx->last_tag, gfp, reserved);
+ tag = blk_mq_get_tag(data);
if (tag != BLK_MQ_TAG_FAIL) {
- rq = hctx->tags->rqs[tag];
+ rq = data->hctx->tags->rqs[tag];
rq->cmd_flags = 0;
- if (blk_mq_tag_busy(hctx)) {
+ if (blk_mq_tag_busy(data->hctx)) {
rq->cmd_flags = REQ_MQ_INFLIGHT;
- atomic_inc(&hctx->nr_active);
+ atomic_inc(&data->hctx->nr_active);
}
rq->tag = tag;
- blk_mq_rq_ctx_init(q, ctx, rq, rw);
+ blk_mq_rq_ctx_init(data->q, data->ctx, rq, rw);
return rq;
}
@@ -262,22 +239,27 @@ struct request *blk_mq_alloc_request(struct request_queue *q, int rw, gfp_t gfp,
struct blk_mq_ctx *ctx;
struct blk_mq_hw_ctx *hctx;
struct request *rq;
+ struct blk_mq_alloc_data alloc_data;
if (blk_mq_queue_enter(q))
return NULL;
ctx = blk_mq_get_ctx(q);
hctx = q->mq_ops->map_queue(q, ctx->cpu);
+ blk_mq_set_alloc_data(&alloc_data, q, gfp & ~__GFP_WAIT,
+ reserved, ctx, hctx);
- rq = __blk_mq_alloc_request(q, hctx, ctx, rw, gfp & ~__GFP_WAIT,
- reserved);
+ rq = __blk_mq_alloc_request(&alloc_data, rw);
if (!rq && (gfp & __GFP_WAIT)) {
__blk_mq_run_hw_queue(hctx);
blk_mq_put_ctx(ctx);
ctx = blk_mq_get_ctx(q);
hctx = q->mq_ops->map_queue(q, ctx->cpu);
- rq = __blk_mq_alloc_request(q, hctx, ctx, rw, gfp, reserved);
+ blk_mq_set_alloc_data(&alloc_data, q, gfp, reserved, ctx,
+ hctx);
+ rq = __blk_mq_alloc_request(&alloc_data, rw);
+ ctx = alloc_data.ctx;
}
blk_mq_put_ctx(ctx);
return rq;
@@ -547,15 +529,20 @@ void blk_mq_kick_requeue_list(struct request_queue *q)
}
EXPORT_SYMBOL(blk_mq_kick_requeue_list);
-struct request *blk_mq_tag_to_rq(struct blk_mq_hw_ctx *hctx, unsigned int tag)
+static inline bool is_flush_request(struct request *rq, unsigned int tag)
{
- struct request_queue *q = hctx->queue;
+ return ((rq->cmd_flags & REQ_FLUSH_SEQ) &&
+ rq->q->flush_rq->tag == tag);
+}
+
+struct request *blk_mq_tag_to_rq(struct blk_mq_tags *tags, unsigned int tag)
+{
+ struct request *rq = tags->rqs[tag];
- if ((q->flush_rq->cmd_flags & REQ_FLUSH_SEQ) &&
- q->flush_rq->tag == tag)
- return q->flush_rq;
+ if (!is_flush_request(rq, tag))
+ return rq;
- return hctx->tags->rqs[tag];
+ return rq->q->flush_rq;
}
EXPORT_SYMBOL(blk_mq_tag_to_rq);
@@ -584,7 +571,7 @@ static void blk_mq_timeout_check(void *__data, unsigned long *free_tags)
if (tag >= hctx->tags->nr_tags)
break;
- rq = blk_mq_tag_to_rq(hctx, 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))
@@ -1158,6 +1145,7 @@ static struct request *blk_mq_map_request(struct request_queue *q,
struct blk_mq_ctx *ctx;
struct request *rq;
int rw = bio_data_dir(bio);
+ struct blk_mq_alloc_data alloc_data;
if (unlikely(blk_mq_queue_enter(q))) {
bio_endio(bio, -EIO);
@@ -1171,7 +1159,9 @@ static struct request *blk_mq_map_request(struct request_queue *q,
rw |= REQ_SYNC;
trace_block_getrq(q, bio, rw);
- rq = __blk_mq_alloc_request(q, hctx, ctx, rw, GFP_ATOMIC, false);
+ blk_mq_set_alloc_data(&alloc_data, q, GFP_ATOMIC, false, ctx,
+ hctx);
+ rq = __blk_mq_alloc_request(&alloc_data, rw);
if (unlikely(!rq)) {
__blk_mq_run_hw_queue(hctx);
blk_mq_put_ctx(ctx);
@@ -1179,8 +1169,11 @@ static struct request *blk_mq_map_request(struct request_queue *q,
ctx = blk_mq_get_ctx(q);
hctx = q->mq_ops->map_queue(q, ctx->cpu);
- rq = __blk_mq_alloc_request(q, hctx, ctx, rw,
- __GFP_WAIT|GFP_ATOMIC, false);
+ blk_mq_set_alloc_data(&alloc_data, q,
+ __GFP_WAIT|GFP_ATOMIC, false, ctx, hctx);
+ rq = __blk_mq_alloc_request(&alloc_data, rw);
+ ctx = alloc_data.ctx;
+ hctx = alloc_data.hctx;
}
hctx->queued++;
@@ -1288,6 +1281,8 @@ static void blk_sq_make_request(struct request_queue *q, struct bio *bio)
return;
rq = blk_mq_map_request(q, bio, &data);
+ if (unlikely(!rq))
+ return;
if (unlikely(is_flush_fua)) {
blk_mq_bio_to_request(rq, bio);
@@ -1562,6 +1557,8 @@ static void blk_mq_exit_hw_queues(struct request_queue *q,
if (i == nr_queue)
break;
+ blk_mq_tag_idle(hctx);
+
if (set->ops->exit_hctx)
set->ops->exit_hctx(hctx, i);
@@ -1779,7 +1776,7 @@ static void blk_mq_add_queue_tag_set(struct blk_mq_tag_set *set,
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 blk_mq_ctx __percpu *ctx;
struct request_queue *q;
unsigned int *map;
int i;
diff --git a/block/blk-mq.h b/block/blk-mq.h
index de7b3bbd5bd6..26460884c6cd 100644
--- a/block/blk-mq.h
+++ b/block/blk-mq.h
@@ -69,4 +69,49 @@ struct blk_align_bitmap {
unsigned long depth;
} ____cacheline_aligned_in_smp;
+static inline struct blk_mq_ctx *__blk_mq_get_ctx(struct request_queue *q,
+ unsigned int cpu)
+{
+ return per_cpu_ptr(q->queue_ctx, cpu);
+}
+
+/*
+ * This assumes per-cpu software queueing queues. They could be per-node
+ * as well, for instance. For now this is hardcoded as-is. Note that we don't
+ * care about preemption, since we know the ctx's are persistent. This does
+ * mean that we can't rely on ctx always matching the currently running CPU.
+ */
+static inline struct blk_mq_ctx *blk_mq_get_ctx(struct request_queue *q)
+{
+ return __blk_mq_get_ctx(q, get_cpu());
+}
+
+static inline void blk_mq_put_ctx(struct blk_mq_ctx *ctx)
+{
+ put_cpu();
+}
+
+struct blk_mq_alloc_data {
+ /* input parameter */
+ struct request_queue *q;
+ gfp_t gfp;
+ bool reserved;
+
+ /* input & output parameter */
+ struct blk_mq_ctx *ctx;
+ struct blk_mq_hw_ctx *hctx;
+};
+
+static inline void blk_mq_set_alloc_data(struct blk_mq_alloc_data *data,
+ struct request_queue *q, gfp_t gfp, bool reserved,
+ struct blk_mq_ctx *ctx,
+ struct blk_mq_hw_ctx *hctx)
+{
+ data->q = q;
+ data->gfp = gfp;
+ data->reserved = reserved;
+ data->ctx = ctx;
+ data->hctx = hctx;
+}
+
#endif
diff --git a/drivers/block/mtip32xx/mtip32xx.c b/drivers/block/mtip32xx/mtip32xx.c
index abc858b3528b..74abd49fabdc 100644
--- a/drivers/block/mtip32xx/mtip32xx.c
+++ b/drivers/block/mtip32xx/mtip32xx.c
@@ -193,7 +193,9 @@ static void mtip_put_int_command(struct driver_data *dd, struct mtip_cmd *cmd)
static struct request *mtip_rq_from_tag(struct driver_data *dd,
unsigned int tag)
{
- return blk_mq_tag_to_rq(dd->queue->queue_hw_ctx[0], tag);
+ struct blk_mq_hw_ctx *hctx = dd->queue->queue_hw_ctx[0];
+
+ return blk_mq_tag_to_rq(hctx->tags, tag);
}
static struct mtip_cmd *mtip_cmd_from_tag(struct driver_data *dd,
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index c15128833100..0feedebfde48 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -155,7 +155,7 @@ void blk_mq_free_request(struct request *rq);
bool blk_mq_can_queue(struct blk_mq_hw_ctx *);
struct request *blk_mq_alloc_request(struct request_queue *q, int rw,
gfp_t gfp, bool reserved);
-struct request *blk_mq_tag_to_rq(struct blk_mq_hw_ctx *hctx, unsigned int tag);
+struct request *blk_mq_tag_to_rq(struct blk_mq_tags *tags, unsigned int tag);
struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *, const int ctx_index);
struct blk_mq_hw_ctx *blk_mq_alloc_single_hw_queue(struct blk_mq_tag_set *, unsigned int, int);
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 8aba35f46f87..5c6f836afa1b 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -335,7 +335,7 @@ struct request_queue {
unsigned int *mq_map;
/* sw queues */
- struct blk_mq_ctx *queue_ctx;
+ struct blk_mq_ctx __percpu *queue_ctx;
unsigned int nr_queues;
/* hw dispatch queues */
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-04 18:03:42 +0000