1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef INT_BLK_MQ_TAG_H
3 #define INT_BLK_MQ_TAG_H
8 * Tag address space map.
12 unsigned int nr_reserved_tags
;
14 atomic_t active_queues
;
16 struct sbitmap_queue bitmap_tags
;
17 struct sbitmap_queue breserved_tags
;
20 struct request
**static_rqs
;
21 struct list_head page_list
;
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
);
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
,
39 static inline struct sbq_wait_state
*bt_wait_ptr(struct sbitmap_queue
*bt
,
40 struct blk_mq_hw_ctx
*hctx
)
44 return sbq_wait_ptr(bt
, &hctx
->wait_index
);
48 BLK_MQ_TAG_CACHE_MIN
= 1,
49 BLK_MQ_TAG_CACHE_MAX
= 64,
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,
58 extern bool __blk_mq_tag_busy(struct blk_mq_hw_ctx
*);
59 extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx
*);
61 static inline bool blk_mq_tag_busy(struct blk_mq_hw_ctx
*hctx
)
63 if (!(hctx
->flags
& BLK_MQ_F_TAG_SHARED
))
66 return __blk_mq_tag_busy(hctx
);
69 static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx
*hctx
)
71 if (!(hctx
->flags
& BLK_MQ_F_TAG_SHARED
))
74 __blk_mq_tag_idle(hctx
);
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
83 static inline void blk_mq_tag_set_rq(struct blk_mq_hw_ctx
*hctx
,
84 unsigned int tag
, struct request
*rq
)
86 hctx
->tags
->rqs
[tag
] = rq
;
89 static inline bool blk_mq_tag_is_reserved(struct blk_mq_tags
*tags
,
92 return tag
< tags
->nr_reserved_tags
;