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Linux kernel mirror (for testing)
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kernel
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linux
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 */
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 /*
25 * used to clear request reference in rqs[] before freeing one
26 * request pool
27 */
28 spinlock_t lock;
29};
30
31extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags,
32 unsigned int reserved_tags,
33 int node, unsigned int flags);
34extern void blk_mq_free_tags(struct blk_mq_tags *tags, unsigned int flags);
35extern int blk_mq_init_bitmaps(struct sbitmap_queue *bitmap_tags,
36 struct sbitmap_queue *breserved_tags,
37 unsigned int queue_depth,
38 unsigned int reserved,
39 int node, int alloc_policy);
40
41extern int blk_mq_init_shared_sbitmap(struct blk_mq_tag_set *set);
42extern void blk_mq_exit_shared_sbitmap(struct blk_mq_tag_set *set);
43extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data);
44extern void blk_mq_put_tag(struct blk_mq_tags *tags, struct blk_mq_ctx *ctx,
45 unsigned int tag);
46extern int blk_mq_tag_update_depth(struct blk_mq_hw_ctx *hctx,
47 struct blk_mq_tags **tags,
48 unsigned int depth, bool can_grow);
49extern void blk_mq_tag_resize_shared_sbitmap(struct blk_mq_tag_set *set,
50 unsigned int size);
51
52extern void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool);
53void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn,
54 void *priv);
55void blk_mq_all_tag_iter(struct blk_mq_tags *tags, busy_tag_iter_fn *fn,
56 void *priv);
57
58static inline struct sbq_wait_state *bt_wait_ptr(struct sbitmap_queue *bt,
59 struct blk_mq_hw_ctx *hctx)
60{
61 if (!hctx)
62 return &bt->ws[0];
63 return sbq_wait_ptr(bt, &hctx->wait_index);
64}
65
66enum {
67 BLK_MQ_NO_TAG = -1U,
68 BLK_MQ_TAG_MIN = 1,
69 BLK_MQ_TAG_MAX = BLK_MQ_NO_TAG - 1,
70};
71
72extern bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *);
73extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx *);
74
75static inline bool blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx)
76{
77 if (!(hctx->flags & BLK_MQ_F_TAG_QUEUE_SHARED))
78 return false;
79
80 return __blk_mq_tag_busy(hctx);
81}
82
83static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx)
84{
85 if (!(hctx->flags & BLK_MQ_F_TAG_QUEUE_SHARED))
86 return;
87
88 __blk_mq_tag_idle(hctx);
89}
90
91static inline bool blk_mq_tag_is_reserved(struct blk_mq_tags *tags,
92 unsigned int tag)
93{
94 return tag < tags->nr_reserved_tags;
95}
96
97#endif