On Wed, Apr 08, 2020 at 08:04:00AM -0700, Douglas Anderson wrote:
> 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@xxxxxxxxxxxx>
> ---
>
> Changes in v4: None
> 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 2cd8d2b49ff4..ea0cd970a3ff 100644
> --- a/block/blk-mq.c
> +++ b/block/blk-mq.c
> @@ -1537,6 +1537,25 @@ 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 11cfd6470b1a..405f8c196517 100644
> --- a/include/linux/blk-mq.h
> +++ b/include/linux/blk-mq.h
> @@ -503,6 +503,7 @@ 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
>
Reviewed-by: Ming Lei <ming.lei@xxxxxxxxxx>
--
Ming
