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blk-mq: add blk_mq_delay_queue

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Add a blk-mq equivalent to blk_delay_queue so that the scsi layer can ask
to be kicked again after a delay.

Signed-off-by: Christoph Hellwig <hch@lst.de>

Modified by me to kill the unnecessary preempt disable/enable
in the delayed workqueue handler.

Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Christoph Hellwig 2014-04-16 10:48:08 -06:00 • committed by Jens Axboe
parent 1b4a325858
commit 70f4db639c
3 changed files with 46 additions and 9 deletions
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4
include/linux/blk-mq.h
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@ -18,7 +18,8 @@ struct blk_mq_hw_ctx {
} ____cacheline_aligned_in_smp;
unsigned long state; /* BLK_MQ_S_* flags */
struct delayed_work delayed_work;
struct delayed_work run_work;
struct delayed_work delay_work;
cpumask_var_t cpumask;
unsigned long flags; /* BLK_MQ_F_* flags */
@ -158,6 +159,7 @@ void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx *hctx);
void blk_mq_start_hw_queue(struct blk_mq_hw_ctx *hctx);
void blk_mq_stop_hw_queues(struct request_queue *q);
void blk_mq_start_stopped_hw_queues(struct request_queue *q, bool async);
void blk_mq_delay_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs);
/*
* Driver command data is immediately after the request. So subtract request