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