[mirror_ubuntu-zesty-kernel.git] / block / blk-mq-tag.h

#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 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_ctx *ctx,
			   unsigned int tag);
extern bool blk_mq_has_free_tags(struct blk_mq_tags *tags);
extern ssize_t blk_mq_tag_sysfs_show(struct blk_mq_tags *tags, char *page);
extern int blk_mq_tag_update_depth(struct blk_mq_tags *tags, unsigned int depth);
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_CACHE_MIN	= 1,
	BLK_MQ_TAG_CACHE_MAX	= 64,
};

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

#endif
Commit	Line	Data
320ae51f JA	1	#ifndef INT_BLK_MQ_TAG_H
	2	#define INT_BLK_MQ_TAG_H
	3
e93ecf60 JA	4	#include "blk-mq.h"
e93ecf60 JA	5
24d2f903 CH	6	/*
	7	* Tag address space map.
	8	*/
	9	struct blk_mq_tags {
	10	unsigned int nr_tags;
	11	unsigned int nr_reserved_tags;
24d2f903	12
0d2602ca JA	13	atomic_t active_queues;
0d2602ca JA	14
88459642 OS	15	struct sbitmap_queue bitmap_tags;
88459642 OS	16	struct sbitmap_queue breserved_tags;
24d2f903 CH	17
	18	struct request **rqs;
	19	struct list_head page_list;
	20	};
	21
320ae51f	22
24391c0d	23	extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags, unsigned int reserved_tags, int node, int alloc_policy);
320ae51f JA	24	extern void blk_mq_free_tags(struct blk_mq_tags *tags);
320ae51f JA	25
cb96a42c	26	extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data);
40aabb67 OS	27	extern void blk_mq_put_tag(struct blk_mq_hw_ctx hctx, struct blk_mq_ctx ctx,
40aabb67 OS	28	unsigned int tag);
320ae51f JA	29	extern bool blk_mq_has_free_tags(struct blk_mq_tags *tags);
320ae51f JA	30	extern ssize_t blk_mq_tag_sysfs_show(struct blk_mq_tags tags, char page);
e3a2b3f9	31	extern int blk_mq_tag_update_depth(struct blk_mq_tags *tags, unsigned int depth);
aed3ea94	32	extern void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool);
0bf6cd5b CH	33	void blk_mq_queue_tag_busy_iter(struct request_queue q, busy_iter_fn fn,
0bf6cd5b CH	34	void *priv);
320ae51f	35
88459642 OS	36	static 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
320ae51f JA	44	enum {
	45	BLK_MQ_TAG_CACHE_MIN = 1,
	46	BLK_MQ_TAG_CACHE_MAX = 64,
	47	};
	48
	49	enum {
	50	BLK_MQ_TAG_FAIL = -1U,
	51	BLK_MQ_TAG_MIN = BLK_MQ_TAG_CACHE_MIN,
	52	BLK_MQ_TAG_MAX = BLK_MQ_TAG_FAIL - 1,
	53	};
	54
0d2602ca JA	55	extern bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *);
	56	extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx *);
	57
	58	static inline bool blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx)
	59	{
	60	if (!(hctx->flags & BLK_MQ_F_TAG_SHARED))
	61	return false;
	62
	63	return __blk_mq_tag_busy(hctx);
	64	}
	65
	66	static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx)
	67	{
	68	if (!(hctx->flags & BLK_MQ_F_TAG_SHARED))
	69	return;
	70
	71	__blk_mq_tag_idle(hctx);
	72	}
	73
0048b483 ML	74	/*
	75	* This helper should only be used for flush request to share tag
	76	* with the request cloned from, and both the two requests can't be
	77	* in flight at the same time. The caller has to make sure the tag
	78	* can't be freed.
	79	*/
	80	static inline void blk_mq_tag_set_rq(struct blk_mq_hw_ctx *hctx,
	81	unsigned int tag, struct request *rq)
	82	{
	83	hctx->tags->rqs[tag] = rq;
	84	}
	85
320ae51f	86	#endif