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 | |
Jens Axboe | 4bb659b | 2014-05-09 09:36:49 -0600 | [diff] [blame] | 6 | enum { |
| 7 | BT_WAIT_QUEUES = 8, |
| 8 | BT_WAIT_BATCH = 8, |
| 9 | }; |
| 10 | |
| 11 | struct bt_wait_state { |
| 12 | atomic_t wait_cnt; |
| 13 | wait_queue_head_t wait; |
| 14 | } ____cacheline_aligned_in_smp; |
| 15 | |
Jens Axboe | 59d13bf | 2014-05-09 13:41:15 -0600 | [diff] [blame] | 16 | #define TAG_TO_INDEX(bt, tag) ((tag) >> (bt)->bits_per_word) |
| 17 | #define TAG_TO_BIT(bt, tag) ((tag) & ((1 << (bt)->bits_per_word) - 1)) |
Jens Axboe | 4bb659b | 2014-05-09 09:36:49 -0600 | [diff] [blame] | 18 | |
Jens Axboe | 4bb659b | 2014-05-09 09:36:49 -0600 | [diff] [blame] | 19 | struct blk_mq_bitmap_tags { |
| 20 | unsigned int depth; |
| 21 | unsigned int wake_cnt; |
Jens Axboe | 59d13bf | 2014-05-09 13:41:15 -0600 | [diff] [blame] | 22 | unsigned int bits_per_word; |
Jens Axboe | 4bb659b | 2014-05-09 09:36:49 -0600 | [diff] [blame] | 23 | |
Jens Axboe | 4bb659b | 2014-05-09 09:36:49 -0600 | [diff] [blame] | 24 | unsigned int map_nr; |
Jens Axboe | e93ecf6 | 2014-05-19 09:17:48 -0600 | [diff] [blame] | 25 | struct blk_align_bitmap *map; |
Jens Axboe | 4bb659b | 2014-05-09 09:36:49 -0600 | [diff] [blame] | 26 | |
Alexander Gordeev | 8537b12 | 2014-06-17 22:12:35 -0700 | [diff] [blame] | 27 | atomic_t wake_index; |
Jens Axboe | 4bb659b | 2014-05-09 09:36:49 -0600 | [diff] [blame] | 28 | struct bt_wait_state *bs; |
| 29 | }; |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 30 | |
| 31 | /* |
| 32 | * Tag address space map. |
| 33 | */ |
| 34 | struct blk_mq_tags { |
| 35 | unsigned int nr_tags; |
| 36 | unsigned int nr_reserved_tags; |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 37 | |
Jens Axboe | 0d2602c | 2014-05-13 15:10:52 -0600 | [diff] [blame] | 38 | atomic_t active_queues; |
| 39 | |
Jens Axboe | 4bb659b | 2014-05-09 09:36:49 -0600 | [diff] [blame] | 40 | struct blk_mq_bitmap_tags bitmap_tags; |
| 41 | struct blk_mq_bitmap_tags breserved_tags; |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 42 | |
| 43 | struct request **rqs; |
| 44 | struct list_head page_list; |
| 45 | }; |
| 46 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 47 | |
| 48 | extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags, unsigned int reserved_tags, int node); |
| 49 | extern void blk_mq_free_tags(struct blk_mq_tags *tags); |
| 50 | |
Ming Lei | cb96a42 | 2014-06-01 00:43:37 +0800 | [diff] [blame] | 51 | extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data); |
Jens Axboe | 0d2602c | 2014-05-13 15:10:52 -0600 | [diff] [blame] | 52 | extern void blk_mq_put_tag(struct blk_mq_hw_ctx *hctx, unsigned int tag, unsigned int *last_tag); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 53 | extern bool blk_mq_has_free_tags(struct blk_mq_tags *tags); |
| 54 | extern ssize_t blk_mq_tag_sysfs_show(struct blk_mq_tags *tags, char *page); |
Jens Axboe | 4bb659b | 2014-05-09 09:36:49 -0600 | [diff] [blame] | 55 | extern void blk_mq_tag_init_last_tag(struct blk_mq_tags *tags, unsigned int *last_tag); |
Jens Axboe | e3a2b3f | 2014-05-20 11:49:02 -0600 | [diff] [blame] | 56 | extern int blk_mq_tag_update_depth(struct blk_mq_tags *tags, unsigned int depth); |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 57 | |
| 58 | enum { |
| 59 | BLK_MQ_TAG_CACHE_MIN = 1, |
| 60 | BLK_MQ_TAG_CACHE_MAX = 64, |
| 61 | }; |
| 62 | |
| 63 | enum { |
| 64 | BLK_MQ_TAG_FAIL = -1U, |
| 65 | BLK_MQ_TAG_MIN = BLK_MQ_TAG_CACHE_MIN, |
| 66 | BLK_MQ_TAG_MAX = BLK_MQ_TAG_FAIL - 1, |
| 67 | }; |
| 68 | |
Jens Axboe | 0d2602c | 2014-05-13 15:10:52 -0600 | [diff] [blame] | 69 | extern bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *); |
| 70 | extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx *); |
| 71 | |
| 72 | static inline bool blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx) |
| 73 | { |
| 74 | if (!(hctx->flags & BLK_MQ_F_TAG_SHARED)) |
| 75 | return false; |
| 76 | |
| 77 | return __blk_mq_tag_busy(hctx); |
| 78 | } |
| 79 | |
| 80 | static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx) |
| 81 | { |
| 82 | if (!(hctx->flags & BLK_MQ_F_TAG_SHARED)) |
| 83 | return; |
| 84 | |
| 85 | __blk_mq_tag_idle(hctx); |
| 86 | } |
| 87 | |
Jens Axboe | 320ae51 | 2013-10-24 09:20:05 +0100 | [diff] [blame] | 88 | #endif |