1
2#ifndef INT_BLK_MQ_TAG_H
3#define INT_BLK_MQ_TAG_H
4
5
6
7
8struct blk_mq_tags {
9 unsigned int nr_tags;
10 unsigned int nr_reserved_tags;
11
12 atomic_t active_queues;
13
14 struct sbitmap_queue *bitmap_tags;
15 struct sbitmap_queue *breserved_tags;
16
17 struct sbitmap_queue __bitmap_tags;
18 struct sbitmap_queue __breserved_tags;
19
20 struct request **rqs;
21 struct request **static_rqs;
22 struct list_head page_list;
23};
24
25extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags,
26 unsigned int reserved_tags,
27 int node, unsigned int flags);
28extern void blk_mq_free_tags(struct blk_mq_tags *tags, unsigned int flags);
29
30extern int blk_mq_init_shared_sbitmap(struct blk_mq_tag_set *set,
31 unsigned int flags);
32extern void blk_mq_exit_shared_sbitmap(struct blk_mq_tag_set *set);
33
34extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data);
35extern void blk_mq_put_tag(struct blk_mq_tags *tags, struct blk_mq_ctx *ctx,
36 unsigned int tag);
37extern int blk_mq_tag_update_depth(struct blk_mq_hw_ctx *hctx,
38 struct blk_mq_tags **tags,
39 unsigned int depth, bool can_grow);
40extern void blk_mq_tag_resize_shared_sbitmap(struct blk_mq_tag_set *set,
41 unsigned int size);
42
43extern void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool);
44void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn,
45 void *priv);
46void blk_mq_all_tag_iter(struct blk_mq_tags *tags, busy_tag_iter_fn *fn,
47 void *priv);
48
49static inline struct sbq_wait_state *bt_wait_ptr(struct sbitmap_queue *bt,
50 struct blk_mq_hw_ctx *hctx)
51{
52 if (!hctx)
53 return &bt->ws[0];
54 return sbq_wait_ptr(bt, &hctx->wait_index);
55}
56
57enum {
58 BLK_MQ_NO_TAG = -1U,
59 BLK_MQ_TAG_MIN = 1,
60 BLK_MQ_TAG_MAX = BLK_MQ_NO_TAG - 1,
61};
62
63extern bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *);
64extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx *);
65
66static inline bool blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx)
67{
68 if (!(hctx->flags & BLK_MQ_F_TAG_QUEUE_SHARED))
69 return false;
70
71 return __blk_mq_tag_busy(hctx);
72}
73
74static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx)
75{
76 if (!(hctx->flags & BLK_MQ_F_TAG_QUEUE_SHARED))
77 return;
78
79 __blk_mq_tag_idle(hctx);
80}
81
82static inline bool blk_mq_tag_is_reserved(struct blk_mq_tags *tags,
83 unsigned int tag)
84{
85 return tag < tags->nr_reserved_tags;
86}
87
88#endif
89
