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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); |
aed3ea94 | 57 | extern void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool); |
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 | ||
0d2602ca JA |
70 | extern bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *); |
71 | extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx *); | |
72 | ||
73 | static inline bool blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx) | |
74 | { | |
75 | if (!(hctx->flags & BLK_MQ_F_TAG_SHARED)) | |
76 | return false; | |
77 | ||
78 | return __blk_mq_tag_busy(hctx); | |
79 | } | |
80 | ||
81 | static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx) | |
82 | { | |
83 | if (!(hctx->flags & BLK_MQ_F_TAG_SHARED)) | |
84 | return; | |
85 | ||
86 | __blk_mq_tag_idle(hctx); | |
87 | } | |
88 | ||
320ae51f | 89 | #endif |