[linux-2.6-block.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;

	cpumask_var_t cpumask;
};


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;
24391c0d	20
f26cdc85	21	cpumask_var_t cpumask;
24d2f903 CH	22	};
24d2f903 CH	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);
40aabb67 OS	29	extern void blk_mq_put_tag(struct blk_mq_hw_ctx hctx, struct blk_mq_ctx ctx,
40aabb67 OS	30	unsigned int tag);
320ae51f JA	31	extern bool blk_mq_has_free_tags(struct blk_mq_tags *tags);
320ae51f JA	32	extern ssize_t blk_mq_tag_sysfs_show(struct blk_mq_tags tags, char page);
e3a2b3f9	33	extern int blk_mq_tag_update_depth(struct blk_mq_tags *tags, unsigned int depth);
aed3ea94	34	extern void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool);
0bf6cd5b CH	35	void blk_mq_queue_tag_busy_iter(struct request_queue q, busy_iter_fn fn,
0bf6cd5b CH	36	void *priv);
320ae51f	37
88459642 OS	38	static inline struct sbq_wait_state bt_wait_ptr(struct sbitmap_queue bt,
	39	struct blk_mq_hw_ctx *hctx)
	40	{
	41	if (!hctx)
	42	return &bt->ws[0];
	43	return sbq_wait_ptr(bt, &hctx->wait_index);
	44	}
	45
320ae51f JA	46	enum {
	47	BLK_MQ_TAG_CACHE_MIN = 1,
	48	BLK_MQ_TAG_CACHE_MAX = 64,
	49	};
	50
	51	enum {
	52	BLK_MQ_TAG_FAIL = -1U,
	53	BLK_MQ_TAG_MIN = BLK_MQ_TAG_CACHE_MIN,
	54	BLK_MQ_TAG_MAX = BLK_MQ_TAG_FAIL - 1,
	55	};
	56
0d2602ca JA	57	extern bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *);
	58	extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx *);
	59
	60	static inline bool blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx)
	61	{
	62	if (!(hctx->flags & BLK_MQ_F_TAG_SHARED))
	63	return false;
	64
	65	return __blk_mq_tag_busy(hctx);
	66	}
	67
	68	static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx)
	69	{
	70	if (!(hctx->flags & BLK_MQ_F_TAG_SHARED))
	71	return;
	72
	73	__blk_mq_tag_idle(hctx);
	74	}
	75
0048b483 ML	76	/*
	77	* This helper should only be used for flush request to share tag
	78	* with the request cloned from, and both the two requests can't be
	79	* in flight at the same time. The caller has to make sure the tag
	80	* can't be freed.
	81	*/
	82	static inline void blk_mq_tag_set_rq(struct blk_mq_hw_ctx *hctx,
	83	unsigned int tag, struct request *rq)
	84	{
	85	hctx->tags->rqs[tag] = rq;
	86	}
	87
320ae51f	88	#endif