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Commit fd001443 authored by Bart Van Assche's avatar Bart Van Assche Committed by Jens Axboe
Browse files

blk-mq: Introduce blk_mq_queue_stopped() 



The function blk_queue_stopped() allows to test whether or not a
traditional request queue has been stopped. Introduce a helper
function that allows block drivers to query easily whether or not
one or more hardware contexts of a blk-mq queue have been stopped.

Signed-off-by: default avatarBart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: default avatarHannes Reinecke <hare@suse.com>
Reviewed-by: default avatarJohannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: default avatarSagi Grimberg <sagi@grimberg.me>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent 5d1b25c1

block/blk-mq.c

+20 −0
Original line number Diff line number Diff line
@@ -944,6 +944,26 @@ void blk_mq_run_hw_queues(struct request_queue *q, bool async) 
}

EXPORT_SYMBOL(blk_mq_run_hw_queues);



/**

 * blk_mq_queue_stopped() - check whether one or more hctxs have been stopped

 * @q: request queue.

 *

 * The caller is responsible for serializing this function against

 * blk_mq_{start,stop}_hw_queue().

 */

bool blk_mq_queue_stopped(struct request_queue *q)

{

	struct blk_mq_hw_ctx *hctx;

	int i;



	queue_for_each_hw_ctx(q, hctx, i)

		if (blk_mq_hctx_stopped(hctx))

			return true;



	return false;

}

EXPORT_SYMBOL(blk_mq_queue_stopped);



void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx *hctx)

{

	cancel_work(&hctx->run_work);

include/linux/blk-mq.h

+1 −0
Original line number Diff line number Diff line
@@ -223,6 +223,7 @@ void blk_mq_delay_kick_requeue_list(struct request_queue *q, unsigned long msecs 
void blk_mq_abort_requeue_list(struct request_queue *q);

void blk_mq_complete_request(struct request *rq, int error);



bool blk_mq_queue_stopped(struct request_queue *q);

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);