blk-mq-tag.h 2.3 KB
Newer Older
1 2 3
#ifndef INT_BLK_MQ_TAG_H
#define INT_BLK_MQ_TAG_H

4 5
#include "blk-mq.h"

6 7 8 9 10 11 12
/*
 * Tag address space map.
 */
struct blk_mq_tags {
	unsigned int nr_tags;
	unsigned int nr_reserved_tags;

13 14
	atomic_t active_queues;

15 16
	struct sbitmap_queue bitmap_tags;
	struct sbitmap_queue breserved_tags;
17 18

	struct request **rqs;
J
Jens Axboe 已提交
19
	struct request **static_rqs;
20 21 22
	struct list_head page_list;
};

23

S
Shaohua Li 已提交
24
extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags, unsigned int reserved_tags, int node, int alloc_policy);
25 26
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 29
extern void blk_mq_put_tag(struct blk_mq_hw_ctx *hctx, struct blk_mq_tags *tags,
			   struct blk_mq_ctx *ctx, unsigned int tag);
30
extern bool blk_mq_has_free_tags(struct blk_mq_tags *tags);
31 32 33
extern int blk_mq_tag_update_depth(struct blk_mq_hw_ctx *hctx,
					struct blk_mq_tags **tags,
					unsigned int depth, bool can_grow);
34
extern void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool);
35 36
void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn,
		void *priv);
37

38 39 40 41 42 43 44 45
static inline struct sbq_wait_state *bt_wait_ptr(struct sbitmap_queue *bt,
						 struct blk_mq_hw_ctx *hctx)
{
	if (!hctx)
		return &bt->ws[0];
	return sbq_wait_ptr(bt, &hctx->wait_index);
}

46 47
enum {
	BLK_MQ_TAG_FAIL		= -1U,
J
Jens Axboe 已提交
48
	BLK_MQ_TAG_MIN		= 1,
49 50 51
	BLK_MQ_TAG_MAX		= BLK_MQ_TAG_FAIL - 1,
};

52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70
extern bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *);
extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx *);

static inline bool blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx)
{
	if (!(hctx->flags & BLK_MQ_F_TAG_SHARED))
		return false;

	return __blk_mq_tag_busy(hctx);
}

static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx)
{
	if (!(hctx->flags & BLK_MQ_F_TAG_SHARED))
		return;

	__blk_mq_tag_idle(hctx);
}

71 72 73 74 75 76 77 78 79 80 81 82
/*
 * This helper should only be used for flush request to share tag
 * with the request cloned from, and both the two requests can't be
 * in flight at the same time. The caller has to make sure the tag
 * can't be freed.
 */
static inline void blk_mq_tag_set_rq(struct blk_mq_hw_ctx *hctx,
		unsigned int tag, struct request *rq)
{
	hctx->tags->rqs[tag] = rq;
}

83 84 85 86 87 88
static inline bool blk_mq_tag_is_reserved(struct blk_mq_tags *tags,
					  unsigned int tag)
{
	return tag < tags->nr_reserved_tags;
}

89
#endif