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_tags *tags, struct blk_mq_ctx *ctx,
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,
37 void blk_mq_all_tag_iter(struct blk_mq_tags *tags, busy_tag_iter_fn *fn,
40 static inline struct sbq_wait_state *bt_wait_ptr(struct sbitmap_queue *bt,
41 struct blk_mq_hw_ctx *hctx)
45 return sbq_wait_ptr(bt, &hctx->wait_index);
51 BLK_MQ_TAG_MAX = BLK_MQ_NO_TAG - 1,
54 bool __blk_mq_get_driver_tag(struct request *rq);
55 static inline bool blk_mq_get_driver_tag(struct request *rq)
57 if (rq->tag != BLK_MQ_NO_TAG)
59 return __blk_mq_get_driver_tag(rq);
62 extern bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *);
63 extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx *);
65 static inline bool blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx)
67 if (!(hctx->flags & BLK_MQ_F_TAG_SHARED))
70 return __blk_mq_tag_busy(hctx);
73 static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx)
75 if (!(hctx->flags & BLK_MQ_F_TAG_SHARED))
78 __blk_mq_tag_idle(hctx);
82 * This helper should only be used for flush request to share tag
83 * with the request cloned from, and both the two requests can't be
84 * in flight at the same time. The caller has to make sure the tag
87 static inline void blk_mq_tag_set_rq(struct blk_mq_hw_ctx *hctx,
88 unsigned int tag, struct request *rq)
90 hctx->tags->rqs[tag] = rq;
93 static inline bool blk_mq_tag_is_reserved(struct blk_mq_tags *tags,
96 return tag < tags->nr_reserved_tags;