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Commit 2f268556 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Jens Axboe
Browse files

blk-mq: add blk_mq_start_hw_queues 



Add a helper to unconditionally kick contexts of a queue.  This will
be needed by the SCSI layer to provide fair queueing between multiple
devices on a single host.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent 70f4db63

block/blk-mq.c

+11 −0
Original line number Diff line number Diff line
@@ -701,6 +701,17 @@ void blk_mq_start_hw_queue(struct blk_mq_hw_ctx *hctx) 
}

EXPORT_SYMBOL(blk_mq_start_hw_queue);



void blk_mq_start_hw_queues(struct request_queue *q)

{

	struct blk_mq_hw_ctx *hctx;

	int i;



	queue_for_each_hw_ctx(q, hctx, i)

		blk_mq_start_hw_queue(hctx);

}

EXPORT_SYMBOL(blk_mq_start_hw_queues);





void blk_mq_start_stopped_hw_queues(struct request_queue *q, bool async)

{

	struct blk_mq_hw_ctx *hctx;

include/linux/blk-mq.h

+1 −0
Original line number Diff line number Diff line
@@ -158,6 +158,7 @@ void blk_mq_complete_request(struct request *rq); 
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_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);