1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef INT_BLK_MQ_TAG_H
 3#define INT_BLK_MQ_TAG_H
 4
 5struct blk_mq_alloc_data;
 6
 7extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags,
 8					unsigned int reserved_tags,
 9					int node, int alloc_policy);
10extern void blk_mq_free_tags(struct blk_mq_tags *tags);
11extern int blk_mq_init_bitmaps(struct sbitmap_queue *bitmap_tags,
12			       struct sbitmap_queue *breserved_tags,
13			       unsigned int queue_depth,
14			       unsigned int reserved,
15			       int node, int alloc_policy);
16
17extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data);
18unsigned long blk_mq_get_tags(struct blk_mq_alloc_data *data, int nr_tags,
19			      unsigned int *offset);
20extern void blk_mq_put_tag(struct blk_mq_tags *tags, struct blk_mq_ctx *ctx,
21			   unsigned int tag);
22void blk_mq_put_tags(struct blk_mq_tags *tags, int *tag_array, int nr_tags);
23extern int blk_mq_tag_update_depth(struct blk_mq_hw_ctx *hctx,
24					struct blk_mq_tags **tags,
25					unsigned int depth, bool can_grow);
26extern void blk_mq_tag_resize_shared_tags(struct blk_mq_tag_set *set,
27					     unsigned int size);
28extern void blk_mq_tag_update_sched_shared_tags(struct request_queue *q);
29
30extern void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool);
31void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_tag_iter_fn *fn,
32		void *priv);
33void blk_mq_all_tag_iter(struct blk_mq_tags *tags, busy_tag_iter_fn *fn,
34		void *priv);
35
36static inline struct sbq_wait_state *bt_wait_ptr(struct sbitmap_queue *bt,
37						 struct blk_mq_hw_ctx *hctx)
38{
39	if (!hctx)
40		return &bt->ws[0];
41	return sbq_wait_ptr(bt, &hctx->wait_index);
42}
43
44enum {
45	BLK_MQ_NO_TAG		= -1U,
46	BLK_MQ_TAG_MIN		= 1,
47	BLK_MQ_TAG_MAX		= BLK_MQ_NO_TAG - 1,
48};
49
50extern void __blk_mq_tag_busy(struct blk_mq_hw_ctx *);
51extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx *);
52
53static inline void blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx)
54{
55	if (hctx->flags & BLK_MQ_F_TAG_QUEUE_SHARED)
56		__blk_mq_tag_busy(hctx);
57}
58
59static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx)
60{
61	if (!(hctx->flags & BLK_MQ_F_TAG_QUEUE_SHARED))
62		return;
63
64	__blk_mq_tag_idle(hctx);
65}
66
67static inline bool blk_mq_tag_is_reserved(struct blk_mq_tags *tags,
68					  unsigned int tag)
69{
70	return tag < tags->nr_reserved_tags;
71}
72
73#endif