[linux.git] / block / blk-mq-tag.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef INT_BLK_MQ_TAG_H
#define INT_BLK_MQ_TAG_H

#include "blk-mq.h"

/*
 * Tag address space map.
 */
struct blk_mq_tags {
	unsigned int nr_tags;
	unsigned int nr_reserved_tags;

	atomic_t active_queues;

	struct sbitmap_queue bitmap_tags;
	struct sbitmap_queue breserved_tags;

	struct request **rqs;
	struct request **static_rqs;
	struct list_head page_list;
};


extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags, unsigned int reserved_tags, int node, int alloc_policy);
extern void blk_mq_free_tags(struct blk_mq_tags *tags);

extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data);
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);
extern bool blk_mq_has_free_tags(struct blk_mq_tags *tags);
extern int blk_mq_tag_update_depth(struct blk_mq_hw_ctx *hctx,
					struct blk_mq_tags **tags,
					unsigned int depth, bool can_grow);
extern void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool);
void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn,
		void *priv);

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);
}

enum {
	BLK_MQ_TAG_FAIL		= -1U,
	BLK_MQ_TAG_MIN		= 1,
	BLK_MQ_TAG_MAX		= BLK_MQ_TAG_FAIL - 1,
};

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);
}

/*
 * 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;
}

static inline bool blk_mq_tag_is_reserved(struct blk_mq_tags *tags,
					  unsigned int tag)
{
	return tag < tags->nr_reserved_tags;
}

#endif
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
320ae51f JA	2	#ifndef INT_BLK_MQ_TAG_H
	3	#define INT_BLK_MQ_TAG_H
	4
e93ecf60 JA	5	#include "blk-mq.h"
e93ecf60 JA	6
24d2f903 CH	7	/*
	8	* Tag address space map.
	9	*/
	10	struct blk_mq_tags {
	11	unsigned int nr_tags;
	12	unsigned int nr_reserved_tags;
24d2f903	13
0d2602ca JA	14	atomic_t active_queues;
0d2602ca JA	15
88459642 OS	16	struct sbitmap_queue bitmap_tags;
88459642 OS	17	struct sbitmap_queue breserved_tags;
24d2f903 CH	18
24d2f903 CH	19	struct request **rqs;
2af8cbe3	20	struct request **static_rqs;
24d2f903 CH	21	struct list_head page_list;
	22	};
	23
320ae51f	24
24391c0d	25	extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags, unsigned int reserved_tags, int node, int alloc_policy);
320ae51f JA	26	extern void blk_mq_free_tags(struct blk_mq_tags *tags);
320ae51f JA	27
cb96a42c	28	extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data);
4941115b JA	29	extern void blk_mq_put_tag(struct blk_mq_hw_ctx hctx, struct blk_mq_tags tags,
4941115b JA	30	struct blk_mq_ctx *ctx, unsigned int tag);
320ae51f	31	extern bool blk_mq_has_free_tags(struct blk_mq_tags *tags);
70f36b60 JA	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);
aed3ea94	35	extern void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool);
0bf6cd5b CH	36	void blk_mq_queue_tag_busy_iter(struct request_queue q, busy_iter_fn fn,
0bf6cd5b CH	37	void *priv);
320ae51f	38
88459642 OS	39	static inline struct sbq_wait_state bt_wait_ptr(struct sbitmap_queue bt,
	40	struct blk_mq_hw_ctx *hctx)
	41	{
	42	if (!hctx)
	43	return &bt->ws[0];
	44	return sbq_wait_ptr(bt, &hctx->wait_index);
	45	}
	46
320ae51f JA	47	enum {
320ae51f JA	48	BLK_MQ_TAG_FAIL = -1U,
5385fa47	49	BLK_MQ_TAG_MIN = 1,
320ae51f JA	50	BLK_MQ_TAG_MAX = BLK_MQ_TAG_FAIL - 1,
	51	};
	52
0d2602ca JA	53	extern bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *);
	54	extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx *);
	55
	56	static inline bool blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx)
	57	{
	58	if (!(hctx->flags & BLK_MQ_F_TAG_SHARED))
	59	return false;
	60
	61	return __blk_mq_tag_busy(hctx);
	62	}
	63
	64	static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx)
	65	{
	66	if (!(hctx->flags & BLK_MQ_F_TAG_SHARED))
	67	return;
	68
	69	__blk_mq_tag_idle(hctx);
	70	}
	71
0048b483 ML	72	/*
	73	* This helper should only be used for flush request to share tag
	74	* with the request cloned from, and both the two requests can't be
	75	* in flight at the same time. The caller has to make sure the tag
	76	* can't be freed.
	77	*/
	78	static inline void blk_mq_tag_set_rq(struct blk_mq_hw_ctx *hctx,
	79	unsigned int tag, struct request *rq)
	80	{
	81	hctx->tags->rqs[tag] = rq;
	82	}
	83
415b806d SG	84	static inline bool blk_mq_tag_is_reserved(struct blk_mq_tags *tags,
	85	unsigned int tag)
	86	{
	87	return tag < tags->nr_reserved_tags;
	88	}
	89
320ae51f	90	#endif