1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef INT_BLK_MQ_TAG_H
3 #define INT_BLK_MQ_TAG_H
4
5 struct blk_mq_alloc_data;
6
7 extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags,
8 unsigned int reserved_tags,
9 int node, int alloc_policy);
10 extern void blk_mq_free_tags(struct blk_mq_tags *tags);
11 extern int blk_mq_init_bitmaps(struct sbitmap_queue *bitmap_tags,
12 struct sbitmap_queue *breserved_tags,
13 unsigned int queue_depth,
14 unsigned int reserved,
15 int node, int alloc_policy);
16
17 extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data);
18 unsigned long blk_mq_get_tags(struct blk_mq_alloc_data *data, int nr_tags,
19 unsigned int *offset);
20 extern void blk_mq_put_tag(struct blk_mq_tags *tags, struct blk_mq_ctx *ctx,
21 unsigned int tag);
22 void blk_mq_put_tags(struct blk_mq_tags *tags, int *tag_array, int nr_tags);
23 extern int blk_mq_tag_update_depth(struct blk_mq_hw_ctx *hctx,
24 struct blk_mq_tags **tags,
25 unsigned int depth, bool can_grow);
26 extern void blk_mq_tag_resize_shared_tags(struct blk_mq_tag_set *set,
27 unsigned int size);
28 extern void blk_mq_tag_update_sched_shared_tags(struct request_queue *q);
29
30 extern void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool);
31 void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn,
32 void *priv);
33 void blk_mq_all_tag_iter(struct blk_mq_tags *tags, busy_tag_iter_fn *fn,
34 void *priv);
35
bt_wait_ptr(struct sbitmap_queue * bt,struct blk_mq_hw_ctx * hctx)36 static inline struct sbq_wait_state *bt_wait_ptr(struct sbitmap_queue *bt,
37 struct blk_mq_hw_ctx *hctx)
38 {
39 if (!hctx)
40 return &bt->ws[0];
41 return sbq_wait_ptr(bt, &hctx->wait_index);
42 }
43
44 enum {
45 BLK_MQ_NO_TAG = -1U,
46 BLK_MQ_TAG_MIN = 1,
47 BLK_MQ_TAG_MAX = BLK_MQ_NO_TAG - 1,
48 };
49
50 extern bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *);
51 extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx *);
52
blk_mq_tag_busy(struct blk_mq_hw_ctx * hctx)53 static inline bool blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx)
54 {
55 if (!(hctx->flags & BLK_MQ_F_TAG_QUEUE_SHARED))
56 return false;
57
58 return __blk_mq_tag_busy(hctx);
59 }
60
blk_mq_tag_idle(struct blk_mq_hw_ctx * hctx)61 static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx)
62 {
63 if (!(hctx->flags & BLK_MQ_F_TAG_QUEUE_SHARED))
64 return;
65
66 __blk_mq_tag_idle(hctx);
67 }
68
blk_mq_tag_is_reserved(struct blk_mq_tags * tags,unsigned int tag)69 static inline bool blk_mq_tag_is_reserved(struct blk_mq_tags *tags,
70 unsigned int tag)
71 {
72 return tag < tags->nr_reserved_tags;
73 }
74
75 #endif
76