blk-mq: don't run the hw_queue from blk_mq_request_bypass_insert

blk_mq_request_bypass_insert takes a bool parameter 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: Damien Le Moal <dlemoal@kernel.org>
Link: https://lore.kernel.org/r/20230413064057.707578-16-hch@lst.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/blk-flush.c b/block/blk-flush.c
index 62ef98f..3561aba 100644 (file)
--- a/block/blk-flush.c
+++ b/block/blk-flush.c
@@ -389,6 +389,7 @@ void blk_insert_flush(struct request *rq)
        unsigned long fflags = q->queue_flags;  /* may change, cache */
        unsigned int policy = blk_flush_policy(fflags, rq);
        struct blk_flush_queue *fq = blk_get_flush_queue(q, rq->mq_ctx);
+       struct blk_mq_hw_ctx *hctx = rq->mq_hctx;
 
        /*
         * @policy now records what operations need to be done.  Adjust
@@ -425,7 +426,8 @@ void blk_insert_flush(struct request *rq)
         */
        if ((policy & REQ_FSEQ_DATA) &&
            !(policy & (REQ_FSEQ_PREFLUSH | REQ_FSEQ_POSTFLUSH))) {
-               blk_mq_request_bypass_insert(rq, false, true);
+               blk_mq_request_bypass_insert(rq, false);
+               blk_mq_run_hw_queue(hctx, false);
                return;
        }
 

diff --git a/block/blk-mq.c b/block/blk-mq.c
index d1941db..cde7ba9 100644 (file)
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1442,7 +1442,7 @@ static void blk_mq_requeue_work(struct work_struct *work)
                if (rq->rq_flags & RQF_DONTPREP) {
                        rq->rq_flags &= ~RQF_SOFTBARRIER;
                        list_del_init(&rq->queuelist);
-                       blk_mq_request_bypass_insert(rq, false, false);
+                       blk_mq_request_bypass_insert(rq, false);
                } else if (rq->rq_flags & RQF_SOFTBARRIER) {
                        rq->rq_flags &= ~RQF_SOFTBARRIER;
                        list_del_init(&rq->queuelist);
@@ -2457,13 +2457,11 @@ static void blk_mq_run_work_fn(struct work_struct *work)
  * blk_mq_request_bypass_insert - Insert a request at dispatch list.
  * @rq: Pointer to request to be inserted.
  * @at_head: true if the request should be inserted at the head of the list.
- * @run_queue: If we should run the hardware queue after inserting the request.
  *
  * 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, bool at_head,
-                                 bool run_queue)
+void blk_mq_request_bypass_insert(struct request *rq, bool at_head)
 {
        struct blk_mq_hw_ctx *hctx = rq->mq_hctx;
 
@@ -2473,9 +2471,6 @@ void blk_mq_request_bypass_insert(struct request *rq, bool at_head,
        else
                list_add_tail(&rq->queuelist, &hctx->dispatch);
        spin_unlock(&hctx->lock);
-
-       if (run_queue)
-               blk_mq_run_hw_queue(hctx, false);
 }
 
 static void blk_mq_insert_requests(struct blk_mq_hw_ctx *hctx,
@@ -2530,7 +2525,7 @@ static void blk_mq_insert_request(struct request *rq, bool at_head)
                 * and it is added to the scheduler queue, there is no chance to
                 * dispatch it given we prioritize requests in hctx->dispatch.
                 */
-               blk_mq_request_bypass_insert(rq, at_head, false);
+               blk_mq_request_bypass_insert(rq, at_head);
        } else if (rq->rq_flags & RQF_FLUSH_SEQ) {
                /*
                 * Firstly normal IO request is inserted to scheduler queue or
@@ -2553,7 +2548,7 @@ static void blk_mq_insert_request(struct request *rq, bool at_head)
                 * Simply queue flush rq to the front of hctx->dispatch so that
                 * intensive flush workloads can benefit in case of NCQ HW.
                 */
-               blk_mq_request_bypass_insert(rq, true, false);
+               blk_mq_request_bypass_insert(rq, true);
        } else if (q->elevator) {
                LIST_HEAD(list);
 
@@ -2673,7 +2668,8 @@ static void blk_mq_try_issue_directly(struct blk_mq_hw_ctx *hctx,
                break;
        case BLK_STS_RESOURCE:
        case BLK_STS_DEV_RESOURCE:
-               blk_mq_request_bypass_insert(rq, false, true);
+               blk_mq_request_bypass_insert(rq, false);
+               blk_mq_run_hw_queue(hctx, false);
                break;
        default:
                blk_mq_end_request(rq, ret);
@@ -2720,7 +2716,8 @@ static void blk_mq_plug_issue_direct(struct blk_plug *plug)
                        break;
                case BLK_STS_RESOURCE:
                case BLK_STS_DEV_RESOURCE:
-                       blk_mq_request_bypass_insert(rq, false, true);
+                       blk_mq_request_bypass_insert(rq, false);
+                       blk_mq_run_hw_queue(hctx, false);
                        goto out;
                default:
                        blk_mq_end_request(rq, ret);
@@ -2838,8 +2835,9 @@ static void blk_mq_try_issue_list_directly(struct blk_mq_hw_ctx *hctx,
                        break;
                case BLK_STS_RESOURCE:
                case BLK_STS_DEV_RESOURCE:
-                       blk_mq_request_bypass_insert(rq, false,
-                                                    list_empty(list));
+                       blk_mq_request_bypass_insert(rq, false);
+                       if (list_empty(list))
+                               blk_mq_run_hw_queue(hctx, false);
                        goto out;
                default:
                        blk_mq_end_request(rq, ret);

diff --git a/block/blk-mq.h b/block/blk-mq.h
index e2d59e3..f30f991 100644 (file)
--- a/block/blk-mq.h
+++ b/block/blk-mq.h
@@ -65,8 +65,7 @@ void blk_mq_free_map_and_rqs(struct blk_mq_tag_set *set,
 /*
  * Internal helpers for request insertion into sw queues
  */
-void blk_mq_request_bypass_insert(struct request *rq, bool at_head,
-                                 bool run_queue);
+void blk_mq_request_bypass_insert(struct request *rq, bool at_head);
 
 /*
  * CPU -> queue mappings