projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 320ae51f JA |
1 | #ifndef INT_BLK_MQ_TAG_H |
| 2 | #define INT_BLK_MQ_TAG_H | |
| 3 | ||
| e93ecf60 JA |
4 | #include "blk-mq.h" |
| 5 | ||
| 4bb659b1 JA |
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 | ||
| 59d13bf5 JA |
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)) | |
| 4bb659b1 | 18 | |
| 4bb659b1 JA |
19 | struct blk_mq_bitmap_tags { |
| 20 | unsigned int depth; | |
| 21 | unsigned int wake_cnt; | |
| 59d13bf5 | 22 | unsigned int bits_per_word; |
| 4bb659b1 | 23 | |
| 4bb659b1 | 24 | unsigned int map_nr; |
| e93ecf60 | 25 | struct blk_align_bitmap *map; |
| 4bb659b1 | 26 | |
| 8537b120 | 27 | atomic_t wake_index; |
| 4bb659b1 JA |
28 | struct bt_wait_state *bs; |
| 29 | }; | |
| 24d2f903 CH |
30 | |
| 31 | /* | |
| 32 | * Tag address space map. | |
| 33 | */ | |
| 34 | struct blk_mq_tags { | |
| 35 | unsigned int nr_tags; | |
| 36 | unsigned int nr_reserved_tags; | |
| 24d2f903 | 37 | |
| 0d2602ca JA |
38 | atomic_t active_queues; |
| 39 | ||
| 4bb659b1 JA |
40 | struct blk_mq_bitmap_tags bitmap_tags; |
| 41 | struct blk_mq_bitmap_tags breserved_tags; | |
| 24d2f903 CH |
42 | |
| 43 | struct request **rqs; | |
| 44 | struct list_head page_list; | |
| 45 | }; | |
| 46 | ||
| 320ae51f JA |
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 | ||
| cb96a42c | 51 | extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data); |
| 0d2602ca | 52 | extern void blk_mq_put_tag(struct blk_mq_hw_ctx *hctx, unsigned int tag, unsigned int *last_tag); |
| 320ae51f JA |
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); | |
| 4bb659b1 | 55 | extern void blk_mq_tag_init_last_tag(struct blk_mq_tags *tags, unsigned int *last_tag); |
| e3a2b3f9 | 56 | extern int blk_mq_tag_update_depth(struct blk_mq_tags *tags, unsigned int depth); |
| 320ae51f JA |
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 | ||
| 0d2602ca JA |
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 | ||
| 320ae51f | 88 | #endif |