From b9151e7bca82a17ff7aa442a168e0f924a07443c Mon Sep 17 00:00:00 2001
From: Douglas Anderson <dianders@chromium.org>
Date: Mon, 20 Apr 2020 09:24:52 -0700
Subject: [PATCH] blk-mq: Add blk_mq_delay_run_hw_queues() API call
Git-commit: b9151e7bca82a17ff7aa442a168e0f924a07443c
Patch-Mainline: v5.11-rc1
References: bsc#1214586
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@chromium.org>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Acked-by: Vasilis Liaskovitis <vliaskovitis@suse.com>
---
block/blk-mq.c | 19 +++++++++++++++++++
include/linux/blk-mq.h | 1 +
2 files changed, 20 insertions(+)
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -1464,6 +1464,25 @@ void blk_mq_run_hw_queues(struct request
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.
*
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -286,6 +286,7 @@ void blk_mq_unquiesce_queue(struct reque
void blk_mq_delay_run_hw_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs);
bool 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);