Commit 9316a9ed authored by Jens Axboe's avatar Jens Axboe
Browse files

blk-mq: provide helper for setting up an SQ queue and tag set 



This pattern is repeated throughout all the blk-mq conversions.
Provide a basic helper to get it done.

Reviewed-by: default avatarMing Lei <ming.lei@redhat.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent de038597

block/blk-mq.c

+33 −0
Original line number Diff line number Diff line
@@ -2507,6 +2507,39 @@ struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *set) 
}

EXPORT_SYMBOL(blk_mq_init_queue);



/*

 * Helper for setting up a queue with mq ops, given queue depth, and

 * the passed in mq ops flags.

 */

struct request_queue *blk_mq_init_sq_queue(struct blk_mq_tag_set *set,

					   const struct blk_mq_ops *ops,

					   unsigned int queue_depth,

					   unsigned int set_flags)

{

	struct request_queue *q;

	int ret;



	memset(set, 0, sizeof(*set));

	set->ops = ops;

	set->nr_hw_queues = 1;

	set->queue_depth = queue_depth;

	set->numa_node = NUMA_NO_NODE;

	set->flags = set_flags;



	ret = blk_mq_alloc_tag_set(set);

	if (ret)

		return ERR_PTR(ret);



	q = blk_mq_init_queue(set);

	if (IS_ERR(q)) {

		blk_mq_free_tag_set(set);

		return q;

	}



	return q;

}

EXPORT_SYMBOL(blk_mq_init_sq_queue);



static int blk_mq_hw_ctx_size(struct blk_mq_tag_set *tag_set)

{

	int hw_ctx_size = sizeof(struct blk_mq_hw_ctx);

include/linux/blk-mq.h

+4 −0
Original line number Diff line number Diff line
@@ -203,6 +203,10 @@ enum { 
struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *);

struct request_queue *blk_mq_init_allocated_queue(struct blk_mq_tag_set *set,

						  struct request_queue *q);

struct request_queue *blk_mq_init_sq_queue(struct blk_mq_tag_set *set,

						const struct blk_mq_ops *ops,

						unsigned int queue_depth,

						unsigned int set_flags);

int blk_mq_register_dev(struct device *, struct request_queue *);

void blk_mq_unregister_dev(struct device *, struct request_queue *);