Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 1 | #ifndef INT_BLK_MQ_TAG_H |
| 2 | #define INT_BLK_MQ_TAG_H |
| 3 | |
Jens Axboe | e93ecf6 | 2014-05-19 09:17:48 -0600 | [diff] [blame] | 4 | #include "blk-mq.h" |
| 5 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 6 | /* |
| 7 | * Tag address space map. |
| 8 | */ |
| 9 | struct blk_mq_tags { |
| 10 | unsigned int nr_tags; |
| 11 | unsigned int nr_reserved_tags; |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 12 | |
Jens Axboe | 0d2602c | 2014-05-13 15:10:52 -0600 | [diff] [blame] | 13 | atomic_t active_queues; |
| 14 | |
Omar Sandoval | 8845964 | 2016-09-17 08:38:44 -0600 | [diff] [blame] | 15 | struct sbitmap_queue bitmap_tags; |
| 16 | struct sbitmap_queue breserved_tags; |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 17 | |
| 18 | struct request **rqs; |
| 19 | struct list_head page_list; |
| 20 | }; |
| 21 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 22 | |
Shaohua Li | 24391c0 | 2015-01-23 14:18:00 -0700 | [diff] [blame] | 23 | extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags, unsigned int reserved_tags, int node, int alloc_policy); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 24 | extern void blk_mq_free_tags(struct blk_mq_tags *tags); |
| 25 | |
Ming Lei | cb96a42 | 2014-06-01 00:43:37 +0800 | [diff] [blame] | 26 | extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data); |
Omar Sandoval | 40aabb6 | 2016-09-17 01:28:23 -0700 | [diff] [blame] | 27 | extern void blk_mq_put_tag(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx, |
| 28 | unsigned int tag); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 29 | extern bool blk_mq_has_free_tags(struct blk_mq_tags *tags); |
| 30 | extern ssize_t blk_mq_tag_sysfs_show(struct blk_mq_tags *tags, char *page); |
Jens Axboe | e3a2b3f | 2014-05-20 11:49:02 -0600 | [diff] [blame] | 31 | extern int blk_mq_tag_update_depth(struct blk_mq_tags *tags, unsigned int depth); |
Jens Axboe | aed3ea9 | 2014-12-22 14:04:42 -0700 | [diff] [blame] | 32 | extern void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool); |
Christoph Hellwig | 0bf6cd5 | 2015-09-27 21:01:51 +0200 | [diff] [blame] | 33 | void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn, |
| 34 | void *priv); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 35 | |
Omar Sandoval | 8845964 | 2016-09-17 08:38:44 -0600 | [diff] [blame] | 36 | static inline struct sbq_wait_state *bt_wait_ptr(struct sbitmap_queue *bt, |
| 37 | struct blk_mq_hw_ctx *hctx) |
| 38 | { |
| 39 | if (!hctx) |
| 40 | return &bt->ws[0]; |
| 41 | return sbq_wait_ptr(bt, &hctx->wait_index); |
| 42 | } |
| 43 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 44 | enum { |
| 45 | BLK_MQ_TAG_CACHE_MIN = 1, |
| 46 | BLK_MQ_TAG_CACHE_MAX = 64, |
| 47 | }; |
| 48 | |
| 49 | enum { |
| 50 | BLK_MQ_TAG_FAIL = -1U, |
| 51 | BLK_MQ_TAG_MIN = BLK_MQ_TAG_CACHE_MIN, |
| 52 | BLK_MQ_TAG_MAX = BLK_MQ_TAG_FAIL - 1, |
| 53 | }; |
| 54 | |
Jens Axboe | 0d2602c | 2014-05-13 15:10:52 -0600 | [diff] [blame] | 55 | extern bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *); |
| 56 | extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx *); |
| 57 | |
| 58 | static inline bool blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx) |
| 59 | { |
| 60 | if (!(hctx->flags & BLK_MQ_F_TAG_SHARED)) |
| 61 | return false; |
| 62 | |
| 63 | return __blk_mq_tag_busy(hctx); |
| 64 | } |
| 65 | |
| 66 | static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx) |
| 67 | { |
| 68 | if (!(hctx->flags & BLK_MQ_F_TAG_SHARED)) |
| 69 | return; |
| 70 | |
| 71 | __blk_mq_tag_idle(hctx); |
| 72 | } |
| 73 | |
Ming Lei | 0048b48 | 2015-08-09 03:41:51 -0400 | [diff] [blame] | 74 | /* |
| 75 | * This helper should only be used for flush request to share tag |
| 76 | * with the request cloned from, and both the two requests can't be |
| 77 | * in flight at the same time. The caller has to make sure the tag |
| 78 | * can't be freed. |
| 79 | */ |
| 80 | static inline void blk_mq_tag_set_rq(struct blk_mq_hw_ctx *hctx, |
| 81 | unsigned int tag, struct request *rq) |
| 82 | { |
| 83 | hctx->tags->rqs[tag] = rq; |
| 84 | } |
| 85 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 86 | #endif |