linux-kernel - [PATCH v3 2/4] blk-mq: Add blk_mq_delay_run_hw

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Message-Id: <20200407145906.v3.2.I4c665d70212a5b33e103fec4d5019a59b4c05577@changeid>
Date:   Tue,  7 Apr 2020 15:00:03 -0700
From:   Douglas Anderson <dianders@...omium.org>
To:     axboe@...nel.dk, jejb@...ux.ibm.com, martin.petersen@...cle.com
Cc:     Ming Lei <ming.lei@...hat.com>, linux-scsi@...r.kernel.org,
        sqazi@...gle.com, Gwendal Grignou <gwendal@...omium.org>,
        groeck@...omium.org, linux-block@...r.kernel.org,
        paolo.valente@...aro.org, Douglas Anderson <dianders@...omium.org>,
        André Almeida <andrealmeid@...labora.com>,
        Bart Van Assche <bvanassche@....org>,
        Damien Le Moal <damien.lemoal@....com>,
        John Garry <john.garry@...wei.com>,
        Pavel Begunkov <asml.silence@...il.com>,
        Sagi Grimberg <sagi@...mberg.me>, linux-kernel@...r.kernel.org
Subject: [PATCH v3 2/4] blk-mq: Add blk_mq_delay_run_hw_queues() API call

We have:
* blk_mq_run_hw_queue()
* blk_mq_delay_run_hw_queue()
* blk_mq_run_hw_queues()

...but not blk_mq_delay_run_hw_queues(), presumably because nobody
needed it before now.  Since we need it for a later patch in this
series, add it.

Signed-off-by: Douglas Anderson <dianders@...omium.org>
---

Changes in v3:
- ("blk-mq: Add blk_mq_delay_run_hw_queues() API call") new for v3

Changes in v2: None

 block/blk-mq.c         | 19 +++++++++++++++++++
 include/linux/blk-mq.h |  1 +
 2 files changed, 20 insertions(+)

diff --git a/block/blk-mq.c b/block/blk-mq.c
index 7d5f388b7da9..f0a89109fb6d 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1544,6 +1544,25 @@ void blk_mq_run_hw_queues(struct request_queue *q, bool async)
 }
 EXPORT_SYMBOL(blk_mq_run_hw_queues);
 
+/**
+ * blk_mq_delay_run_hw_queues - Run all hardware queues asynchronously.
+ * @q: Pointer to the request queue to run.
+ * @msecs: Microseconds of delay to wait before running the queues.
+ */
+void blk_mq_delay_run_hw_queues(struct request_queue *q, unsigned long msecs)
+{
+	struct blk_mq_hw_ctx *hctx;
+	int i;
+
+	queue_for_each_hw_ctx(q, hctx, i) {
+		if (blk_mq_hctx_stopped(hctx))
+			continue;
+
+		blk_mq_delay_run_hw_queue(hctx, msecs);
+	}
+}
+EXPORT_SYMBOL(blk_mq_delay_run_hw_queues);
+
 /**
  * blk_mq_queue_stopped() - check whether one or more hctxs have been stopped
  * @q: request queue.
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index f389d7c724bd..3bbc730eca72 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -508,6 +508,7 @@ void blk_mq_unquiesce_queue(struct request_queue *q);
 void blk_mq_delay_run_hw_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs);
 void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
 void blk_mq_run_hw_queues(struct request_queue *q, bool async);
+void blk_mq_delay_run_hw_queues(struct request_queue *q, unsigned long msecs);
 void blk_mq_tagset_busy_iter(struct blk_mq_tag_set *tagset,
 		busy_tag_iter_fn *fn, void *priv);
 void blk_mq_tagset_wait_completed_request(struct blk_mq_tag_set *tagset);
-- 
2.26.0.292.g33ef6b2f38-goog