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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
320ae51f JA |
2 | #ifndef INT_BLK_MQ_TAG_H |
3 | #define INT_BLK_MQ_TAG_H | |
4 | ||
e93ecf60 JA |
5 | #include "blk-mq.h" |
6 | ||
24d2f903 CH |
7 | /* |
8 | * Tag address space map. | |
9 | */ | |
10 | struct blk_mq_tags { | |
11 | unsigned int nr_tags; | |
12 | unsigned int nr_reserved_tags; | |
24d2f903 | 13 | |
0d2602ca JA |
14 | atomic_t active_queues; |
15 | ||
88459642 OS |
16 | struct sbitmap_queue bitmap_tags; |
17 | struct sbitmap_queue breserved_tags; | |
24d2f903 CH |
18 | |
19 | struct request **rqs; | |
2af8cbe3 | 20 | struct request **static_rqs; |
24d2f903 CH |
21 | struct list_head page_list; |
22 | }; | |
23 | ||
320ae51f | 24 | |
24391c0d | 25 | extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags, unsigned int reserved_tags, int node, int alloc_policy); |
320ae51f JA |
26 | extern void blk_mq_free_tags(struct blk_mq_tags *tags); |
27 | ||
cb96a42c | 28 | extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data); |
cae740a0 JG |
29 | extern void blk_mq_put_tag(struct blk_mq_tags *tags, struct blk_mq_ctx *ctx, |
30 | unsigned int tag); | |
70f36b60 JA |
31 | extern int blk_mq_tag_update_depth(struct blk_mq_hw_ctx *hctx, |
32 | struct blk_mq_tags **tags, | |
33 | unsigned int depth, bool can_grow); | |
aed3ea94 | 34 | extern void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool); |
0bf6cd5b CH |
35 | void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn, |
36 | void *priv); | |
320ae51f | 37 | |
88459642 OS |
38 | static inline struct sbq_wait_state *bt_wait_ptr(struct sbitmap_queue *bt, |
39 | struct blk_mq_hw_ctx *hctx) | |
40 | { | |
41 | if (!hctx) | |
42 | return &bt->ws[0]; | |
43 | return sbq_wait_ptr(bt, &hctx->wait_index); | |
44 | } | |
45 | ||
320ae51f JA |
46 | enum { |
47 | BLK_MQ_TAG_FAIL = -1U, | |
5385fa47 | 48 | BLK_MQ_TAG_MIN = 1, |
320ae51f JA |
49 | BLK_MQ_TAG_MAX = BLK_MQ_TAG_FAIL - 1, |
50 | }; | |
51 | ||
0d2602ca JA |
52 | extern bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *); |
53 | extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx *); | |
54 | ||
55 | static inline bool blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx) | |
56 | { | |
57 | if (!(hctx->flags & BLK_MQ_F_TAG_SHARED)) | |
58 | return false; | |
59 | ||
60 | return __blk_mq_tag_busy(hctx); | |
61 | } | |
62 | ||
63 | static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx) | |
64 | { | |
65 | if (!(hctx->flags & BLK_MQ_F_TAG_SHARED)) | |
66 | return; | |
67 | ||
68 | __blk_mq_tag_idle(hctx); | |
69 | } | |
70 | ||
0048b483 ML |
71 | /* |
72 | * This helper should only be used for flush request to share tag | |
73 | * with the request cloned from, and both the two requests can't be | |
74 | * in flight at the same time. The caller has to make sure the tag | |
75 | * can't be freed. | |
76 | */ | |
77 | static inline void blk_mq_tag_set_rq(struct blk_mq_hw_ctx *hctx, | |
78 | unsigned int tag, struct request *rq) | |
79 | { | |
80 | hctx->tags->rqs[tag] = rq; | |
81 | } | |
82 | ||
415b806d SG |
83 | static inline bool blk_mq_tag_is_reserved(struct blk_mq_tags *tags, |
84 | unsigned int tag) | |
85 | { | |
86 | return tag < tags->nr_reserved_tags; | |
87 | } | |
88 | ||
320ae51f | 89 | #endif |