diff options
| author | Jens Axboe <axboe@kernel.dk> | 2021-10-16 16:38:14 -0600 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2021-10-19 05:55:41 -0600 |
| commit | e028f167eca5fc56938e6c1680d40eed0bc39e80 (patch) | |
| tree | 8b8d8043d38dd9faa0be7b32f0a3809ab24a2d01 /include/linux/blk-mq.h | |
| parent | df87eb0fce8fc891b43199447b9aeb3ea2d39bcf (diff) | |
block: move blk_mq_tag_to_rq() inline
This is in the fast path of driver issue or completion, and it's a single
array index operation. Move it inline to avoid a function call for it.
This does mean making struct blk_mq_tags block layer public, but there's
not really much in there.
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/linux/blk-mq.h')
| -rw-r--r-- | include/linux/blk-mq.h | 36 |
1 files changed, 35 insertions, 1 deletions
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h index 656fe34bdb6c..6cf35de151a9 100644 --- a/include/linux/blk-mq.h +++ b/include/linux/blk-mq.h @@ -7,6 +7,7 @@ #include <linux/srcu.h> #include <linux/lockdep.h> #include <linux/scatterlist.h> +#include <linux/prefetch.h> struct blk_mq_tags; struct blk_flush_queue; @@ -675,7 +676,40 @@ struct request *blk_mq_alloc_request(struct request_queue *q, unsigned int op, struct request *blk_mq_alloc_request_hctx(struct request_queue *q, unsigned int op, blk_mq_req_flags_t flags, unsigned int hctx_idx); -struct request *blk_mq_tag_to_rq(struct blk_mq_tags *tags, unsigned int tag); + +/* + * Tag address space map. + */ +struct blk_mq_tags { + unsigned int nr_tags; + unsigned int nr_reserved_tags; + + atomic_t active_queues; + + struct sbitmap_queue bitmap_tags; + struct sbitmap_queue breserved_tags; + + struct request **rqs; + struct request **static_rqs; + struct list_head page_list; + + /* + * used to clear request reference in rqs[] before freeing one + * request pool + */ + spinlock_t lock; +}; + +static inline struct request *blk_mq_tag_to_rq(struct blk_mq_tags *tags, + unsigned int tag) +{ + if (tag < tags->nr_tags) { + prefetch(tags->rqs[tag]); + return tags->rqs[tag]; + } + + return NULL; +} enum { BLK_MQ_UNIQUE_TAG_BITS = 16, |