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authorChristoph Hellwig <hch@lst.de>2023-04-13 08:40:51 +0200
committerJens Axboe <axboe@kernel.dk>2023-04-13 06:52:30 -0600
commitf0dbe6e88e1bf4003ef778527b975ff60dbdd35a (patch)
tree58b8da18c84504ca6dc47fb87c773b8823d7a850 /block
parente1f44ac0d7f48ec44a1eacfe637e545c408ede40 (diff)
blk-mq: don't run the hw_queue from blk_mq_insert_request
blk_mq_insert_request takes two bool parameters to control how to run the queue at the end of the function. Move the blk_mq_run_hw_queue call to the callers that want it instead. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Bart Van Assche <bvanassche@acm.org> Reviewed-by: Damien Le Moal <dlemoal@kernel.org> Link: https://lore.kernel.org/r/20230413064057.707578-15-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/blk-mq.c56
1 files changed, 32 insertions, 24 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c
index c5b42476337c..d1941db1ad3c 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -44,8 +44,7 @@
static DEFINE_PER_CPU(struct llist_head, blk_cpu_done);
-static void blk_mq_insert_request(struct request *rq, bool at_head,
- bool run_queue, bool async);
+static void blk_mq_insert_request(struct request *rq, bool at_head);
static void blk_mq_try_issue_list_directly(struct blk_mq_hw_ctx *hctx,
struct list_head *list);
@@ -1292,6 +1291,8 @@ static void blk_add_rq_to_plug(struct blk_plug *plug, struct request *rq)
*/
void blk_execute_rq_nowait(struct request *rq, bool at_head)
{
+ struct blk_mq_hw_ctx *hctx = rq->mq_hctx;
+
WARN_ON(irqs_disabled());
WARN_ON(!blk_rq_is_passthrough(rq));
@@ -1302,10 +1303,13 @@ void blk_execute_rq_nowait(struct request *rq, bool at_head)
* device, directly accessing the plug instead of using blk_mq_plug()
* should not have any consequences.
*/
- if (current->plug && !at_head)
+ if (current->plug && !at_head) {
blk_add_rq_to_plug(current->plug, rq);
- else
- blk_mq_insert_request(rq, at_head, true, false);
+ return;
+ }
+
+ blk_mq_insert_request(rq, at_head);
+ blk_mq_run_hw_queue(hctx, false);
}
EXPORT_SYMBOL_GPL(blk_execute_rq_nowait);
@@ -1355,6 +1359,7 @@ static void blk_rq_poll_completion(struct request *rq, struct completion *wait)
*/
blk_status_t blk_execute_rq(struct request *rq, bool at_head)
{
+ struct blk_mq_hw_ctx *hctx = rq->mq_hctx;
struct blk_rq_wait wait = {
.done = COMPLETION_INITIALIZER_ONSTACK(wait.done),
};
@@ -1366,7 +1371,8 @@ blk_status_t blk_execute_rq(struct request *rq, bool at_head)
rq->end_io = blk_end_sync_rq;
blk_account_io_start(rq);
- blk_mq_insert_request(rq, at_head, true, false);
+ blk_mq_insert_request(rq, at_head);
+ blk_mq_run_hw_queue(hctx, false);
if (blk_rq_is_poll(rq)) {
blk_rq_poll_completion(rq, &wait.done);
@@ -1440,14 +1446,14 @@ static void blk_mq_requeue_work(struct work_struct *work)
} else if (rq->rq_flags & RQF_SOFTBARRIER) {
rq->rq_flags &= ~RQF_SOFTBARRIER;
list_del_init(&rq->queuelist);
- blk_mq_insert_request(rq, true, false, false);
+ blk_mq_insert_request(rq, true);
}
}
while (!list_empty(&rq_list)) {
rq = list_entry(rq_list.next, struct request, queuelist);
list_del_init(&rq->queuelist);
- blk_mq_insert_request(rq, false, false, false);
+ blk_mq_insert_request(rq, false);
}
blk_mq_run_hw_queues(q, false);
@@ -2507,8 +2513,7 @@ out:
blk_mq_run_hw_queue(hctx, run_queue_async);
}
-static void blk_mq_insert_request(struct request *rq, bool at_head,
- bool run_queue, bool async)
+static void blk_mq_insert_request(struct request *rq, bool at_head)
{
struct request_queue *q = rq->q;
struct blk_mq_ctx *ctx = rq->mq_ctx;
@@ -2568,9 +2573,6 @@ static void blk_mq_insert_request(struct request *rq, bool at_head,
blk_mq_hctx_mark_pending(hctx, ctx);
spin_unlock(&ctx->lock);
}
-
- if (run_queue)
- blk_mq_run_hw_queue(hctx, async);
}
static void blk_mq_bio_to_request(struct request *rq, struct bio *bio,
@@ -2655,12 +2657,13 @@ static void blk_mq_try_issue_directly(struct blk_mq_hw_ctx *hctx,
blk_status_t ret;
if (blk_mq_hctx_stopped(hctx) || blk_queue_quiesced(rq->q)) {
- blk_mq_insert_request(rq, false, false, false);
+ blk_mq_insert_request(rq, false);
return;
}
if ((rq->rq_flags & RQF_ELV) || !blk_mq_get_budget_and_tag(rq)) {
- blk_mq_insert_request(rq, false, true, false);
+ blk_mq_insert_request(rq, false);
+ blk_mq_run_hw_queue(hctx, false);
return;
}
@@ -2683,7 +2686,7 @@ static blk_status_t blk_mq_request_issue_directly(struct request *rq, bool last)
struct blk_mq_hw_ctx *hctx = rq->mq_hctx;
if (blk_mq_hctx_stopped(hctx) || blk_queue_quiesced(rq->q)) {
- blk_mq_insert_request(rq, false, false, false);
+ blk_mq_insert_request(rq, false);
return BLK_STS_OK;
}
@@ -2963,6 +2966,7 @@ void blk_mq_submit_bio(struct bio *bio)
struct request_queue *q = bdev_get_queue(bio->bi_bdev);
struct blk_plug *plug = blk_mq_plug(bio);
const int is_sync = op_is_sync(bio->bi_opf);
+ struct blk_mq_hw_ctx *hctx;
struct request *rq;
unsigned int nr_segs = 1;
blk_status_t ret;
@@ -3007,15 +3011,19 @@ void blk_mq_submit_bio(struct bio *bio)
return;
}
- if (plug)
+ if (plug) {
blk_add_rq_to_plug(plug, rq);
- else if ((rq->rq_flags & RQF_ELV) ||
- (rq->mq_hctx->dispatch_busy &&
- (q->nr_hw_queues == 1 || !is_sync)))
- blk_mq_insert_request(rq, false, true, true);
- else
- blk_mq_run_dispatch_ops(rq->q,
- blk_mq_try_issue_directly(rq->mq_hctx, rq));
+ return;
+ }
+
+ hctx = rq->mq_hctx;
+ if ((rq->rq_flags & RQF_ELV) ||
+ (hctx->dispatch_busy && (q->nr_hw_queues == 1 || !is_sync))) {
+ blk_mq_insert_request(rq, false);
+ blk_mq_run_hw_queue(hctx, true);
+ } else {
+ blk_mq_run_dispatch_ops(q, blk_mq_try_issue_directly(hctx, rq));
+ }
}
#ifdef CONFIG_BLK_MQ_STACKING