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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 | ||
24d2f903 CH |
6 | /* |
7 | * Tag address space map. | |
8 | */ | |
9 | struct blk_mq_tags { | |
10 | unsigned int nr_tags; | |
11 | unsigned int nr_reserved_tags; | |
24d2f903 | 12 | |
0d2602ca JA |
13 | atomic_t active_queues; |
14 | ||
88459642 OS |
15 | struct sbitmap_queue bitmap_tags; |
16 | struct sbitmap_queue breserved_tags; | |
24d2f903 CH |
17 | |
18 | struct request **rqs; | |
2af8cbe3 | 19 | struct request **static_rqs; |
24d2f903 CH |
20 | struct list_head page_list; |
21 | }; | |
22 | ||
320ae51f | 23 | |
24391c0d | 24 | extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags, unsigned int reserved_tags, int node, int alloc_policy); |
320ae51f JA |
25 | extern void blk_mq_free_tags(struct blk_mq_tags *tags); |
26 | ||
cb96a42c | 27 | extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data); |
4941115b JA |
28 | extern void blk_mq_put_tag(struct blk_mq_hw_ctx *hctx, struct blk_mq_tags *tags, |
29 | struct blk_mq_ctx *ctx, unsigned int tag); | |
320ae51f JA |
30 | extern bool blk_mq_has_free_tags(struct blk_mq_tags *tags); |
31 | extern ssize_t blk_mq_tag_sysfs_show(struct blk_mq_tags *tags, char *page); | |
e3a2b3f9 | 32 | extern int blk_mq_tag_update_depth(struct blk_mq_tags *tags, unsigned int depth); |
aed3ea94 | 33 | extern void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool); |
0bf6cd5b CH |
34 | void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn, |
35 | void *priv); | |
320ae51f | 36 | |
88459642 OS |
37 | static inline struct sbq_wait_state *bt_wait_ptr(struct sbitmap_queue *bt, |
38 | struct blk_mq_hw_ctx *hctx) | |
39 | { | |
40 | if (!hctx) | |
41 | return &bt->ws[0]; | |
42 | return sbq_wait_ptr(bt, &hctx->wait_index); | |
43 | } | |
44 | ||
320ae51f JA |
45 | enum { |
46 | BLK_MQ_TAG_CACHE_MIN = 1, | |
47 | BLK_MQ_TAG_CACHE_MAX = 64, | |
48 | }; | |
49 | ||
50 | enum { | |
51 | BLK_MQ_TAG_FAIL = -1U, | |
52 | BLK_MQ_TAG_MIN = BLK_MQ_TAG_CACHE_MIN, | |
53 | BLK_MQ_TAG_MAX = BLK_MQ_TAG_FAIL - 1, | |
54 | }; | |
55 | ||
0d2602ca JA |
56 | extern bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *); |
57 | extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx *); | |
58 | ||
59 | static inline bool blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx) | |
60 | { | |
61 | if (!(hctx->flags & BLK_MQ_F_TAG_SHARED)) | |
62 | return false; | |
63 | ||
64 | return __blk_mq_tag_busy(hctx); | |
65 | } | |
66 | ||
67 | static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx) | |
68 | { | |
69 | if (!(hctx->flags & BLK_MQ_F_TAG_SHARED)) | |
70 | return; | |
71 | ||
72 | __blk_mq_tag_idle(hctx); | |
73 | } | |
74 | ||
0048b483 ML |
75 | /* |
76 | * This helper should only be used for flush request to share tag | |
77 | * with the request cloned from, and both the two requests can't be | |
78 | * in flight at the same time. The caller has to make sure the tag | |
79 | * can't be freed. | |
80 | */ | |
81 | static inline void blk_mq_tag_set_rq(struct blk_mq_hw_ctx *hctx, | |
82 | unsigned int tag, struct request *rq) | |
83 | { | |
84 | hctx->tags->rqs[tag] = rq; | |
85 | } | |
86 | ||
320ae51f | 87 | #endif |