[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;

	int alloc_policy;
	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, unsigned int tag, unsigned int *last_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 void blk_mq_tag_init_last_tag(struct blk_mq_tags *tags, unsigned int *last_tag);
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 SL	20
24391c0d SL	21	int alloc_policy;
f26cdc85	22	cpumask_var_t cpumask;
24d2f903 CH	23	};
24d2f903 CH	24
320ae51f	25
24391c0d	26	extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags, unsigned int reserved_tags, int node, int alloc_policy);
320ae51f JA	27	extern void blk_mq_free_tags(struct blk_mq_tags *tags);
320ae51f JA	28
cb96a42c	29	extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data);
0d2602ca	30	extern void blk_mq_put_tag(struct blk_mq_hw_ctx hctx, unsigned int tag, unsigned int last_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);
4bb659b1	33	extern void blk_mq_tag_init_last_tag(struct blk_mq_tags tags, unsigned int last_tag);
e3a2b3f9	34	extern int blk_mq_tag_update_depth(struct blk_mq_tags *tags, unsigned int depth);
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 {
	48	BLK_MQ_TAG_CACHE_MIN = 1,
	49	BLK_MQ_TAG_CACHE_MAX = 64,
	50	};
	51
	52	enum {
	53	BLK_MQ_TAG_FAIL = -1U,
	54	BLK_MQ_TAG_MIN = BLK_MQ_TAG_CACHE_MIN,
	55	BLK_MQ_TAG_MAX = BLK_MQ_TAG_FAIL - 1,
	56	};
	57
0d2602ca JA	58	extern bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *);
	59	extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx *);
	60
	61	static inline bool blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx)
	62	{
	63	if (!(hctx->flags & BLK_MQ_F_TAG_SHARED))
	64	return false;
	65
	66	return __blk_mq_tag_busy(hctx);
	67	}
	68
	69	static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx)
	70	{
	71	if (!(hctx->flags & BLK_MQ_F_TAG_SHARED))
	72	return;
	73
	74	__blk_mq_tag_idle(hctx);
	75	}
	76
0048b483 ML	77	/*
	78	* This helper should only be used for flush request to share tag
	79	* with the request cloned from, and both the two requests can't be
	80	* in flight at the same time. The caller has to make sure the tag
	81	* can't be freed.
	82	*/
	83	static inline void blk_mq_tag_set_rq(struct blk_mq_hw_ctx *hctx,
	84	unsigned int tag, struct request *rq)
	85	{
	86	hctx->tags->rqs[tag] = rq;
	87	}
	88
320ae51f	89	#endif