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author | Jens Axboe <axboe@kernel.dk> | 2018-10-15 16:40:37 +0200 |
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committer | Jens Axboe <axboe@kernel.dk> | 2018-10-16 04:05:18 +0200 |
commit | 9316a9ed6895c4ad2f0cde171d486f80c55d8283 (patch) | |
tree | f72148bad015f286fad4b38d09b2d740dcfa0fcc /block | |
parent | null_blk: remove set but not used variable 'q' (diff) | |
download | linux-9316a9ed6895c4ad2f0cde171d486f80c55d8283.tar.xz linux-9316a9ed6895c4ad2f0cde171d486f80c55d8283.zip |
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: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r-- | block/blk-mq.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c index c2ecd64a2403..dcf10e39995a 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -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); |