1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef INT_BLK_MQ_TAG_H
3 #define INT_BLK_MQ_TAG_H
4
5 #include "blk-mq.h"
6
7 /*
8 * Tag address space map.
9 */
10 struct blk_mq_tags {
11 unsigned int nr_tags;
12 unsigned int nr_reserved_tags;
13
14 atomic_t active_queues;
15
16 struct sbitmap_queue bitmap_tags;
17 struct sbitmap_queue breserved_tags;
18
19 struct request **rqs;
20 struct request **static_rqs;
21 struct list_head page_list;
22 };
23
24
25 extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags, unsigned int reserved_tags, int node, int alloc_policy);
26 extern void blk_mq_free_tags(struct blk_mq_tags *tags);
27
28 extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data);
29 extern void blk_mq_put_tag(struct blk_mq_hw_ctx *hctx, struct blk_mq_tags *tags,
30 struct blk_mq_ctx *ctx, unsigned int tag);
31 extern bool blk_mq_has_free_tags(struct blk_mq_tags *tags);
32 extern int blk_mq_tag_update_depth(struct blk_mq_hw_ctx *hctx,
33 struct blk_mq_tags **tags,
34 unsigned int depth, bool can_grow);
35 extern void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool);
36 void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn,
37 void *priv);
38
bt_wait_ptr(struct sbitmap_queue * bt,struct blk_mq_hw_ctx * hctx)39 static inline struct sbq_wait_state *bt_wait_ptr(struct sbitmap_queue *bt,
40 struct blk_mq_hw_ctx *hctx)
41 {
42 if (!hctx)
43 return &bt->ws[0];
44 return sbq_wait_ptr(bt, &hctx->wait_index);
45 }
46
47 enum {
48 BLK_MQ_TAG_CACHE_MIN = 1,
49 BLK_MQ_TAG_CACHE_MAX = 64,
50 };
51
52 enum {
53 BLK_MQ_TAG_FAIL = -1U,
54 BLK_MQ_TAG_MIN = BLK_MQ_TAG_CACHE_MIN,
55 BLK_MQ_TAG_MAX = BLK_MQ_TAG_FAIL - 1,
56 };
57
58 extern bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *);
59 extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx *);
60
blk_mq_tag_busy(struct blk_mq_hw_ctx * hctx)61 static inline bool blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx)
62 {
63 if (!(hctx->flags & BLK_MQ_F_TAG_SHARED))
64 return false;
65
66 return __blk_mq_tag_busy(hctx);
67 }
68
blk_mq_tag_idle(struct blk_mq_hw_ctx * hctx)69 static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx)
70 {
71 if (!(hctx->flags & BLK_MQ_F_TAG_SHARED))
72 return;
73
74 __blk_mq_tag_idle(hctx);
75 }
76
77 /*
78 * This helper should only be used for flush request to share tag
79 * with the request cloned from, and both the two requests can't be
80 * in flight at the same time. The caller has to make sure the tag
81 * can't be freed.
82 */
blk_mq_tag_set_rq(struct blk_mq_hw_ctx * hctx,unsigned int tag,struct request * rq)83 static inline void blk_mq_tag_set_rq(struct blk_mq_hw_ctx *hctx,
84 unsigned int tag, struct request *rq)
85 {
86 hctx->tags->rqs[tag] = rq;
87 }
88
blk_mq_tag_is_reserved(struct blk_mq_tags * tags,unsigned int tag)89 static inline bool blk_mq_tag_is_reserved(struct blk_mq_tags *tags,
90 unsigned int tag)
91 {
92 return tag < tags->nr_reserved_tags;
93 }
94
95 #endif
96