From 7587a5ae7eef0439f7be31f1b5959af062bbc5ec Mon Sep 17 00:00:00 2001 From: Bart Van Assche Date: Fri, 7 Apr 2017 11:16:52 -0700 Subject: blk-mq: Introduce blk_mq_delay_run_hw_queue() Introduce a function that runs a hardware queue unconditionally after a delay. Note: there is already a function that stops and restarts a hardware queue after a delay, namely blk_mq_delay_queue(). This function will be used in the next patch in this series. Signed-off-by: Bart Van Assche Cc: Christoph Hellwig Cc: Hannes Reinecke Cc: Long Li Cc: K. Y. Srinivasan Signed-off-by: Jens Axboe --- block/blk-mq.c | 32 ++++++++++++++++++++++++++++++-- 1 file changed, 30 insertions(+), 2 deletions(-) (limited to 'block') diff --git a/block/blk-mq.c b/block/blk-mq.c index f1be5c3eb600..ad45ae743186 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -1135,7 +1135,8 @@ static int blk_mq_hctx_next_cpu(struct blk_mq_hw_ctx *hctx) return hctx->next_cpu; } -void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async) +static void __blk_mq_delay_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async, + unsigned long msecs) { if (unlikely(blk_mq_hctx_stopped(hctx) || !blk_mq_hw_queue_mapped(hctx))) @@ -1152,7 +1153,24 @@ void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async) put_cpu(); } - kblockd_schedule_work_on(blk_mq_hctx_next_cpu(hctx), &hctx->run_work); + if (msecs == 0) + kblockd_schedule_work_on(blk_mq_hctx_next_cpu(hctx), + &hctx->run_work); + else + kblockd_schedule_delayed_work_on(blk_mq_hctx_next_cpu(hctx), + &hctx->delayed_run_work, + msecs_to_jiffies(msecs)); +} + +void blk_mq_delay_run_hw_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs) +{ + __blk_mq_delay_run_hw_queue(hctx, true, msecs); +} +EXPORT_SYMBOL(blk_mq_delay_run_hw_queue); + +void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async) +{ + __blk_mq_delay_run_hw_queue(hctx, async, 0); } void blk_mq_run_hw_queues(struct request_queue *q, bool async) @@ -1255,6 +1273,15 @@ static void blk_mq_run_work_fn(struct work_struct *work) __blk_mq_run_hw_queue(hctx); } +static void blk_mq_delayed_run_work_fn(struct work_struct *work) +{ + struct blk_mq_hw_ctx *hctx; + + hctx = container_of(work, struct blk_mq_hw_ctx, delayed_run_work.work); + + __blk_mq_run_hw_queue(hctx); +} + static void blk_mq_delay_work_fn(struct work_struct *work) { struct blk_mq_hw_ctx *hctx; @@ -1962,6 +1989,7 @@ static int blk_mq_init_hctx(struct request_queue *q, node = hctx->numa_node = set->numa_node; INIT_WORK(&hctx->run_work, blk_mq_run_work_fn); + INIT_DELAYED_WORK(&hctx->delayed_run_work, blk_mq_delayed_run_work_fn); INIT_DELAYED_WORK(&hctx->delay_work, blk_mq_delay_work_fn); spin_lock_init(&hctx->lock); INIT_LIST_HEAD(&hctx->dispatch); -- cgit v1.2.3