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authorJens Axboe <axboe@kernel.dk>2018-10-15 16:40:37 +0200
committerJens Axboe <axboe@kernel.dk>2018-10-16 04:05:18 +0200
commit9316a9ed6895c4ad2f0cde171d486f80c55d8283 (patch)
treef72148bad015f286fad4b38d09b2d740dcfa0fcc /block
parentnull_blk: remove set but not used variable 'q' (diff)
downloadlinux-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.c33
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);