1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef INT_BLK_MQ_TAG_H
3 #define INT_BLK_MQ_TAG_H
4
5 /*
6 * Tag address space map.
7 */
8 struct 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 /*
25 * used to clear request reference in rqs[] before freeing one
26 * request pool
27 */
28 spinlock_t lock;
29 };
30
31 extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags,
32 unsigned int reserved_tags,
33 int node, unsigned int flags);
34 extern void blk_mq_free_tags(struct blk_mq_tags *tags, unsigned int flags);
35
36 extern int blk_mq_init_shared_sbitmap(struct blk_mq_tag_set *set,
37 unsigned int flags);
38 extern void blk_mq_exit_shared_sbitmap(struct blk_mq_tag_set *set);
39
40 extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data);
41 extern void blk_mq_put_tag(struct blk_mq_tags *tags, struct blk_mq_ctx *ctx,
42 unsigned int tag);
43 extern int blk_mq_tag_update_depth(struct blk_mq_hw_ctx *hctx,
44 struct blk_mq_tags **tags,
45 unsigned int depth, bool can_grow);
46 extern void blk_mq_tag_resize_shared_sbitmap(struct blk_mq_tag_set *set,
47 unsigned int size);
48
49 extern void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool);
50 void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn,
51 void *priv);
52 void blk_mq_all_tag_iter(struct blk_mq_tags *tags, busy_tag_iter_fn *fn,
53 void *priv);
54
bt_wait_ptr(struct sbitmap_queue * bt,struct blk_mq_hw_ctx * hctx)55 static inline struct sbq_wait_state *bt_wait_ptr(struct sbitmap_queue *bt,
56 struct blk_mq_hw_ctx *hctx)
57 {
58 if (!hctx)
59 return &bt->ws[0];
60 return sbq_wait_ptr(bt, &hctx->wait_index);
61 }
62
63 enum {
64 BLK_MQ_NO_TAG = -1U,
65 BLK_MQ_TAG_MIN = 1,
66 BLK_MQ_TAG_MAX = BLK_MQ_NO_TAG - 1,
67 };
68
69 extern bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *);
70 extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx *);
71
blk_mq_tag_busy(struct blk_mq_hw_ctx * hctx)72 static inline bool blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx)
73 {
74 if (!(hctx->flags & BLK_MQ_F_TAG_QUEUE_SHARED))
75 return false;
76
77 return __blk_mq_tag_busy(hctx);
78 }
79
blk_mq_tag_idle(struct blk_mq_hw_ctx * hctx)80 static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx)
81 {
82 if (!(hctx->flags & BLK_MQ_F_TAG_QUEUE_SHARED))
83 return;
84
85 __blk_mq_tag_idle(hctx);
86 }
87
blk_mq_tag_is_reserved(struct blk_mq_tags * tags,unsigned int tag)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