1 #ifndef INT_BLK_MQ_TAG_H
2 #define INT_BLK_MQ_TAG_H
3
4 #include "blk-mq.h"
5
6 enum {
7 BT_WAIT_QUEUES = 8,
8 BT_WAIT_BATCH = 8,
9 };
10
11 struct 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
19 struct 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 */
34 struct 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 int alloc_policy;
47 };
48
49
50 extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags, unsigned int reserved_tags, int node, int alloc_policy);
51 extern void blk_mq_free_tags(struct blk_mq_tags *tags);
52
53 extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data);
54 extern void blk_mq_put_tag(struct blk_mq_hw_ctx *hctx, unsigned int tag, unsigned int *last_tag);
55 extern bool blk_mq_has_free_tags(struct blk_mq_tags *tags);
56 extern ssize_t blk_mq_tag_sysfs_show(struct blk_mq_tags *tags, char *page);
57 extern void blk_mq_tag_init_last_tag(struct blk_mq_tags *tags, unsigned int *last_tag);
58 extern int blk_mq_tag_update_depth(struct blk_mq_tags *tags, unsigned int depth);
59 extern void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool);
60
61 enum {
62 BLK_MQ_TAG_CACHE_MIN = 1,
63 BLK_MQ_TAG_CACHE_MAX = 64,
64 };
65
66 enum {
67 BLK_MQ_TAG_FAIL = -1U,
68 BLK_MQ_TAG_MIN = BLK_MQ_TAG_CACHE_MIN,
69 BLK_MQ_TAG_MAX = BLK_MQ_TAG_FAIL - 1,
70 };
71
72 extern bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *);
73 extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx *);
74
blk_mq_tag_busy(struct blk_mq_hw_ctx * hctx)75 static inline bool blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx)
76 {
77 if (!(hctx->flags & BLK_MQ_F_TAG_SHARED))
78 return false;
79
80 return __blk_mq_tag_busy(hctx);
81 }
82
blk_mq_tag_idle(struct blk_mq_hw_ctx * hctx)83 static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx)
84 {
85 if (!(hctx->flags & BLK_MQ_F_TAG_SHARED))
86 return;
87
88 __blk_mq_tag_idle(hctx);
89 }
90
91 #endif
92