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Linux kernel mirror (for testing)
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kernel
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linux
1#ifndef INT_BLK_MQ_TAG_H
2#define INT_BLK_MQ_TAG_H
3
4#include "blk-mq.h"
5
6enum {
7 BT_WAIT_QUEUES = 8,
8 BT_WAIT_BATCH = 8,
9};
10
11struct bt_wait_state {
12 atomic_t wait_cnt;
13 wait_queue_head_t wait;
14} ____cacheline_aligned_in_smp;
15
16#define TAG_TO_INDEX(bt, tag) ((tag) >> (bt)->bits_per_word)
17#define TAG_TO_BIT(bt, tag) ((tag) & ((1 << (bt)->bits_per_word) - 1))
18
19struct blk_mq_bitmap_tags {
20 unsigned int depth;
21 unsigned int wake_cnt;
22 unsigned int bits_per_word;
23
24 unsigned int map_nr;
25 struct blk_align_bitmap *map;
26
27 atomic_t wake_index;
28 struct bt_wait_state *bs;
29};
30
31/*
32 * Tag address space map.
33 */
34struct blk_mq_tags {
35 unsigned int nr_tags;
36 unsigned int nr_reserved_tags;
37
38 atomic_t active_queues;
39
40 struct blk_mq_bitmap_tags bitmap_tags;
41 struct blk_mq_bitmap_tags breserved_tags;
42
43 struct request **rqs;
44 struct list_head page_list;
45};
46
47
48extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags, unsigned int reserved_tags, int node);
49extern void blk_mq_free_tags(struct blk_mq_tags *tags);
50
51extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data);
52extern void blk_mq_put_tag(struct blk_mq_hw_ctx *hctx, unsigned int tag, unsigned int *last_tag);
53extern bool blk_mq_has_free_tags(struct blk_mq_tags *tags);
54extern ssize_t blk_mq_tag_sysfs_show(struct blk_mq_tags *tags, char *page);
55extern void blk_mq_tag_init_last_tag(struct blk_mq_tags *tags, unsigned int *last_tag);
56extern int blk_mq_tag_update_depth(struct blk_mq_tags *tags, unsigned int depth);
57
58enum {
59 BLK_MQ_TAG_CACHE_MIN = 1,
60 BLK_MQ_TAG_CACHE_MAX = 64,
61};
62
63enum {
64 BLK_MQ_TAG_FAIL = -1U,
65 BLK_MQ_TAG_MIN = BLK_MQ_TAG_CACHE_MIN,
66 BLK_MQ_TAG_MAX = BLK_MQ_TAG_FAIL - 1,
67};
68
69extern bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *);
70extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx *);
71
72static inline bool blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx)
73{
74 if (!(hctx->flags & BLK_MQ_F_TAG_SHARED))
75 return false;
76
77 return __blk_mq_tag_busy(hctx);
78}
79
80static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx)
81{
82 if (!(hctx->flags & BLK_MQ_F_TAG_SHARED))
83 return;
84
85 __blk_mq_tag_idle(hctx);
86}
87
88#endif