[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"

enum {
	BT_WAIT_QUEUES	= 8,
	BT_WAIT_BATCH	= 8,
};

struct bt_wait_state {
	atomic_t wait_cnt;
	wait_queue_head_t wait;
} ____cacheline_aligned_in_smp;

#define TAG_TO_INDEX(bt, tag)	((tag) >> (bt)->bits_per_word)
#define TAG_TO_BIT(bt, tag)	((tag) & ((1 << (bt)->bits_per_word) - 1))

struct blk_mq_bitmap_tags {
	unsigned int depth;
	unsigned int wake_cnt;
	unsigned int bits_per_word;

	unsigned int map_nr;
	struct blk_align_bitmap *map;

	atomic_t wake_index;
	struct bt_wait_state *bs;
};

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

	atomic_t active_queues;

	struct blk_mq_bitmap_tags bitmap_tags;
	struct blk_mq_bitmap_tags 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);

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
4bb659b1 JA	6	enum {
	7	BT_WAIT_QUEUES = 8,
	8	BT_WAIT_BATCH = 8,
	9	};
	10
	11	struct bt_wait_state {
	12	atomic_t wait_cnt;
	13	wait_queue_head_t wait;
	14	} ____cacheline_aligned_in_smp;
	15
59d13bf5 JA	16	#define TAG_TO_INDEX(bt, tag) ((tag) >> (bt)->bits_per_word)
59d13bf5 JA	17	#define TAG_TO_BIT(bt, tag) ((tag) & ((1 << (bt)->bits_per_word) - 1))
4bb659b1	18
4bb659b1 JA	19	struct blk_mq_bitmap_tags {
	20	unsigned int depth;
	21	unsigned int wake_cnt;
59d13bf5	22	unsigned int bits_per_word;
4bb659b1	23
4bb659b1	24	unsigned int map_nr;
e93ecf60	25	struct blk_align_bitmap *map;
4bb659b1	26
8537b120	27	atomic_t wake_index;
4bb659b1 JA	28	struct bt_wait_state *bs;
4bb659b1 JA	29	};
24d2f903 CH	30
	31	/*
	32	* Tag address space map.
	33	*/
	34	struct blk_mq_tags {
	35	unsigned int nr_tags;
	36	unsigned int nr_reserved_tags;
24d2f903	37
0d2602ca JA	38	atomic_t active_queues;
0d2602ca JA	39
4bb659b1 JA	40	struct blk_mq_bitmap_tags bitmap_tags;
4bb659b1 JA	41	struct blk_mq_bitmap_tags breserved_tags;
24d2f903 CH	42
	43	struct request **rqs;
	44	struct list_head page_list;
24391c0d SL	45
24391c0d SL	46	int alloc_policy;
f26cdc85	47	cpumask_var_t cpumask;
24d2f903 CH	48	};
24d2f903 CH	49
320ae51f	50
24391c0d	51	extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags, unsigned int reserved_tags, int node, int alloc_policy);
320ae51f JA	52	extern void blk_mq_free_tags(struct blk_mq_tags *tags);
320ae51f JA	53
cb96a42c	54	extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data);
0d2602ca	55	extern void blk_mq_put_tag(struct blk_mq_hw_ctx hctx, unsigned int tag, unsigned int last_tag);
320ae51f JA	56	extern bool blk_mq_has_free_tags(struct blk_mq_tags *tags);
320ae51f JA	57	extern ssize_t blk_mq_tag_sysfs_show(struct blk_mq_tags tags, char page);
4bb659b1	58	extern void blk_mq_tag_init_last_tag(struct blk_mq_tags tags, unsigned int last_tag);
e3a2b3f9	59	extern int blk_mq_tag_update_depth(struct blk_mq_tags *tags, unsigned int depth);
aed3ea94	60	extern void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool);
0bf6cd5b CH	61	void blk_mq_queue_tag_busy_iter(struct request_queue q, busy_iter_fn fn,
0bf6cd5b CH	62	void *priv);
320ae51f JA	63
	64	enum {
	65	BLK_MQ_TAG_CACHE_MIN = 1,
	66	BLK_MQ_TAG_CACHE_MAX = 64,
	67	};
	68
	69	enum {
	70	BLK_MQ_TAG_FAIL = -1U,
	71	BLK_MQ_TAG_MIN = BLK_MQ_TAG_CACHE_MIN,
	72	BLK_MQ_TAG_MAX = BLK_MQ_TAG_FAIL - 1,
	73	};
	74
0d2602ca JA	75	extern bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *);
	76	extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx *);
	77
	78	static inline bool blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx)
	79	{
	80	if (!(hctx->flags & BLK_MQ_F_TAG_SHARED))
	81	return false;
	82
	83	return __blk_mq_tag_busy(hctx);
	84	}
	85
	86	static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx)
	87	{
	88	if (!(hctx->flags & BLK_MQ_F_TAG_SHARED))
	89	return;
	90
	91	__blk_mq_tag_idle(hctx);
	92	}
	93
0048b483 ML	94	/*
	95	* This helper should only be used for flush request to share tag
	96	* with the request cloned from, and both the two requests can't be
	97	* in flight at the same time. The caller has to make sure the tag
	98	* can't be freed.
	99	*/
	100	static inline void blk_mq_tag_set_rq(struct blk_mq_hw_ctx *hctx,
	101	unsigned int tag, struct request *rq)
	102	{
	103	hctx->tags->rqs[tag] = rq;
	104	}
	105
320ae51f	106	#endif