1 #ifndef INT_BLK_MQ_TAG_H
2 #define INT_BLK_MQ_TAG_H
3
4 #include "blk-mq.h"
5
6 /*
7 * Tag address space map.
8 */
9 struct blk_mq_tags {
10 unsigned int nr_tags;
11 unsigned int nr_reserved_tags;
12
13 atomic_t active_queues;
14
15 struct sbitmap_queue bitmap_tags;
16 struct sbitmap_queue breserved_tags;
17
18 struct request **rqs;
19 struct request **static_rqs;
20 struct list_head page_list;
21 };
22
23
24 extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags, unsigned int reserved_tags, int node, int alloc_policy);
25 extern void blk_mq_free_tags(struct blk_mq_tags *tags);
26
27 extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data);
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);
30 extern bool blk_mq_has_free_tags(struct blk_mq_tags *tags);
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);
34 extern void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool);
35 void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn,
36 void *priv);
37
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
46 enum {
47 BLK_MQ_TAG_CACHE_MIN = 1,
48 BLK_MQ_TAG_CACHE_MAX = 64,
49 };
50
51 enum {
52 BLK_MQ_TAG_FAIL = -1U,
53 BLK_MQ_TAG_MIN = BLK_MQ_TAG_CACHE_MIN,
54 BLK_MQ_TAG_MAX = BLK_MQ_TAG_FAIL - 1,
55 };
56
57 extern bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *);
58 extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx *);
59
60 static inline bool blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx)
61 {
62 if (!(hctx->flags & BLK_MQ_F_TAG_SHARED))
63 return false;
64
65 return __blk_mq_tag_busy(hctx);
66 }
67
68 static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx)
69 {
70 if (!(hctx->flags & BLK_MQ_F_TAG_SHARED))
71 return;
72
73 __blk_mq_tag_idle(hctx);
74 }
75
76 /*
77 * This helper should only be used for flush request to share tag
78 * with the request cloned from, and both the two requests can't be
79 * in flight at the same time. The caller has to make sure the tag
80 * can't be freed.
81 */
82 static inline void blk_mq_tag_set_rq(struct blk_mq_hw_ctx *hctx,
83 unsigned int tag, struct request *rq)
84 {
85 hctx->tags->rqs[tag] = rq;
86 }
87
88 static inline bool blk_mq_tag_is_reserved(struct blk_mq_tags *tags,
89 unsigned int tag)
90 {
91 return tag < tags->nr_reserved_tags;
92 }
93
94 #endif
95
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