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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 | ||
59d13bf5 JA |
14 | #define TAG_TO_INDEX(bt, tag) ((tag) >> (bt)->bits_per_word) |
15 | #define TAG_TO_BIT(bt, tag) ((tag) & ((1 << (bt)->bits_per_word) - 1)) | |
4bb659b1 JA |
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; | |
59d13bf5 | 25 | unsigned int bits_per_word; |
4bb659b1 | 26 | |
4bb659b1 | 27 | unsigned int map_nr; |
59d13bf5 | 28 | struct blk_mq_bitmap *map; |
4bb659b1 JA |
29 | |
30 | unsigned int wake_index; | |
31 | struct bt_wait_state *bs; | |
32 | }; | |
24d2f903 CH |
33 | |
34 | /* | |
35 | * Tag address space map. | |
36 | */ | |
37 | struct blk_mq_tags { | |
38 | unsigned int nr_tags; | |
39 | unsigned int nr_reserved_tags; | |
24d2f903 | 40 | |
4bb659b1 JA |
41 | struct blk_mq_bitmap_tags bitmap_tags; |
42 | struct blk_mq_bitmap_tags breserved_tags; | |
24d2f903 CH |
43 | |
44 | struct request **rqs; | |
45 | struct list_head page_list; | |
46 | }; | |
47 | ||
320ae51f JA |
48 | |
49 | extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags, unsigned int reserved_tags, int node); | |
50 | extern void blk_mq_free_tags(struct blk_mq_tags *tags); | |
51 | ||
4bb659b1 JA |
52 | 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); |
53 | extern void blk_mq_wait_for_tags(struct blk_mq_tags *tags, struct blk_mq_hw_ctx *hctx, bool reserved); | |
54 | extern void blk_mq_put_tag(struct blk_mq_tags *tags, unsigned int tag, unsigned int *last_tag); | |
320ae51f JA |
55 | extern void blk_mq_tag_busy_iter(struct blk_mq_tags *tags, void (*fn)(void *data, unsigned long *), void *data); |
56 | extern bool blk_mq_has_free_tags(struct blk_mq_tags *tags); | |
57 | extern ssize_t blk_mq_tag_sysfs_show(struct blk_mq_tags *tags, char *page); | |
4bb659b1 | 58 | extern void blk_mq_tag_init_last_tag(struct blk_mq_tags *tags, unsigned int *last_tag); |
320ae51f JA |
59 | |
60 | enum { | |
61 | BLK_MQ_TAG_CACHE_MIN = 1, | |
62 | BLK_MQ_TAG_CACHE_MAX = 64, | |
63 | }; | |
64 | ||
65 | enum { | |
66 | BLK_MQ_TAG_FAIL = -1U, | |
67 | BLK_MQ_TAG_MIN = BLK_MQ_TAG_CACHE_MIN, | |
68 | BLK_MQ_TAG_MAX = BLK_MQ_TAG_FAIL - 1, | |
69 | }; | |
70 | ||
71 | #endif |