projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 320ae51f JA |
1 | #ifndef INT_BLK_MQ_TAG_H |
| 2 | #define INT_BLK_MQ_TAG_H | |
| 3 | ||
| 4bb659b1 JA |
4 | enum { |
| 5 | BT_WAIT_QUEUES = 8, | |
| 6 | BT_WAIT_BATCH = 8, | |
| 7 | }; | |
| 8 | ||
| 9 | struct bt_wait_state { | |
| 10 | atomic_t wait_cnt; | |
| 11 | wait_queue_head_t wait; | |
| 12 | } ____cacheline_aligned_in_smp; | |
| 13 | ||
| 14 | #define TAG_TO_INDEX(tag) ((tag) / BITS_PER_LONG) | |
| 15 | #define TAG_TO_BIT(tag) ((tag) & (BITS_PER_LONG - 1)) | |
| 16 | ||
| 17 | struct blk_mq_bitmap { | |
| 18 | unsigned long word; | |
| 19 | unsigned long depth; | |
| 20 | } ____cacheline_aligned_in_smp; | |
| 21 | ||
| 22 | struct blk_mq_bitmap_tags { | |
| 23 | unsigned int depth; | |
| 24 | unsigned int wake_cnt; | |
| 25 | ||
| 26 | struct blk_mq_bitmap *map; | |
| 27 | unsigned int map_nr; | |
| 28 | ||
| 29 | unsigned int wake_index; | |
| 30 | struct bt_wait_state *bs; | |
| 31 | }; | |
| 24d2f903 CH |
32 | |
| 33 | /* | |
| 34 | * Tag address space map. | |
| 35 | */ | |
| 36 | struct blk_mq_tags { | |
| 37 | unsigned int nr_tags; | |
| 38 | unsigned int nr_reserved_tags; | |
| 24d2f903 | 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 | ||
| 4bb659b1 JA |
51 | extern unsigned int blk_mq_get_tag(struct blk_mq_tags *tags, struct blk_mq_hw_ctx *hctx, unsigned int *last_tag, gfp_t gfp, bool reserved); |
| 52 | extern void blk_mq_wait_for_tags(struct blk_mq_tags *tags, struct blk_mq_hw_ctx *hctx, bool reserved); | |
| 53 | extern void blk_mq_put_tag(struct blk_mq_tags *tags, unsigned int tag, unsigned int *last_tag); | |
| 320ae51f JA |
54 | extern void blk_mq_tag_busy_iter(struct blk_mq_tags *tags, void (*fn)(void *data, unsigned long *), void *data); |
| 55 | extern bool blk_mq_has_free_tags(struct blk_mq_tags *tags); | |
| 56 | extern ssize_t blk_mq_tag_sysfs_show(struct blk_mq_tags *tags, char *page); | |
| 4bb659b1 | 57 | extern void blk_mq_tag_init_last_tag(struct blk_mq_tags *tags, unsigned int *last_tag); |
| 320ae51f JA |
58 | |
| 59 | enum { | |
| 60 | BLK_MQ_TAG_CACHE_MIN = 1, | |
| 61 | BLK_MQ_TAG_CACHE_MAX = 64, | |
| 62 | }; | |
| 63 | ||
| 64 | enum { | |
| 65 | BLK_MQ_TAG_FAIL = -1U, | |
| 66 | BLK_MQ_TAG_MIN = BLK_MQ_TAG_CACHE_MIN, | |
| 67 | BLK_MQ_TAG_MAX = BLK_MQ_TAG_FAIL - 1, | |
| 68 | }; | |
| 69 | ||
| 70 | #endif |