1 #ifndef INT_BLK_MQ_TAG_H
2 #define INT_BLK_MQ_TAG_H
7 * Tag address space map.
11 unsigned int nr_reserved_tags
;
13 atomic_t active_queues
;
15 struct sbitmap_queue bitmap_tags
;
16 struct sbitmap_queue breserved_tags
;
19 struct request
**static_rqs
;
20 struct list_head page_list
;
24 extern struct blk_mq_tags
*blk_mq_init_tags(unsigned int nr_tags
, unsigned int reserved_tags
, int node
, int alloc_policy
);
25 extern void blk_mq_free_tags(struct blk_mq_tags
*tags
);
27 extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data
*data
);
28 extern void blk_mq_put_tag(struct blk_mq_hw_ctx
*hctx
, struct blk_mq_tags
*tags
,
29 struct blk_mq_ctx
*ctx
, unsigned int tag
);
30 extern bool blk_mq_has_free_tags(struct blk_mq_tags
*tags
);
31 extern int blk_mq_tag_update_depth(struct blk_mq_hw_ctx
*hctx
,
32 struct blk_mq_tags
**tags
,
33 unsigned int depth
, bool can_grow
);
34 extern void blk_mq_tag_wakeup_all(struct blk_mq_tags
*tags
, bool);
35 void blk_mq_queue_tag_busy_iter(struct request_queue
*q
, busy_iter_fn
*fn
,
38 static inline struct sbq_wait_state
*bt_wait_ptr(struct sbitmap_queue
*bt
,
39 struct blk_mq_hw_ctx
*hctx
)
43 return sbq_wait_ptr(bt
, &hctx
->wait_index
);
47 BLK_MQ_TAG_CACHE_MIN
= 1,
48 BLK_MQ_TAG_CACHE_MAX
= 64,
52 BLK_MQ_TAG_FAIL
= -1U,
53 BLK_MQ_TAG_MIN
= BLK_MQ_TAG_CACHE_MIN
,
54 BLK_MQ_TAG_MAX
= BLK_MQ_TAG_FAIL
- 1,
57 extern bool __blk_mq_tag_busy(struct blk_mq_hw_ctx
*);
58 extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx
*);
60 static inline bool blk_mq_tag_busy(struct blk_mq_hw_ctx
*hctx
)
62 if (!(hctx
->flags
& BLK_MQ_F_TAG_SHARED
))
65 return __blk_mq_tag_busy(hctx
);
68 static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx
*hctx
)
70 if (!(hctx
->flags
& BLK_MQ_F_TAG_SHARED
))
73 __blk_mq_tag_idle(hctx
);
77 * This helper should only be used for flush request to share tag
78 * with the request cloned from, and both the two requests can't be
79 * in flight at the same time. The caller has to make sure the tag
82 static inline void blk_mq_tag_set_rq(struct blk_mq_hw_ctx
*hctx
,
83 unsigned int tag
, struct request
*rq
)
85 hctx
->tags
->rqs
[tag
] = rq
;
88 static inline bool blk_mq_tag_is_reserved(struct blk_mq_tags
*tags
,
91 return tag
< tags
->nr_reserved_tags
;