[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;

	unsigned int wake_index;
	struct bt_wait_state *bs;
};

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

	struct blk_mq_bitmap_tags bitmap_tags;
	struct blk_mq_bitmap_tags 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);
extern void blk_mq_free_tags(struct blk_mq_tags *tags);

extern unsigned int blk_mq_get_tag(struct blk_mq_tags *tags, struct blk_mq_hw_ctx *hctx, unsigned int *last_tag, gfp_t gfp, bool reserved);
extern void blk_mq_wait_for_tags(struct blk_mq_tags *tags, struct blk_mq_hw_ctx *hctx, bool reserved);
extern void blk_mq_put_tag(struct blk_mq_tags *tags, unsigned int tag, unsigned int *last_tag);
extern void blk_mq_tag_busy_iter(struct blk_mq_tags *tags, void (*fn)(void *data, unsigned long *), void *data);
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);

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,
};

#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 JA	26
	27	unsigned int wake_index;
	28	struct bt_wait_state *bs;
	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
4bb659b1 JA	38	struct blk_mq_bitmap_tags bitmap_tags;
4bb659b1 JA	39	struct blk_mq_bitmap_tags breserved_tags;
24d2f903 CH	40
	41	struct request **rqs;
	42	struct list_head page_list;
	43	};
	44
320ae51f JA	45
	46	extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags, unsigned int reserved_tags, int node);
	47	extern void blk_mq_free_tags(struct blk_mq_tags *tags);
	48
4bb659b1 JA	49	extern unsigned int blk_mq_get_tag(struct blk_mq_tags tags, struct blk_mq_hw_ctx hctx, unsigned int *last_tag, gfp_t gfp, bool reserved);
	50	extern void blk_mq_wait_for_tags(struct blk_mq_tags tags, struct blk_mq_hw_ctx hctx, bool reserved);
	51	extern void blk_mq_put_tag(struct blk_mq_tags tags, unsigned int tag, unsigned int last_tag);
320ae51f JA	52	extern void blk_mq_tag_busy_iter(struct blk_mq_tags tags, void (fn)(void data, unsigned long ), void *data);
	53	extern bool blk_mq_has_free_tags(struct blk_mq_tags *tags);
	54	extern ssize_t blk_mq_tag_sysfs_show(struct blk_mq_tags tags, char page);
4bb659b1	55	extern void blk_mq_tag_init_last_tag(struct blk_mq_tags tags, unsigned int last_tag);
320ae51f JA	56
	57	enum {
	58	BLK_MQ_TAG_CACHE_MIN = 1,
	59	BLK_MQ_TAG_CACHE_MAX = 64,
	60	};
	61
	62	enum {
	63	BLK_MQ_TAG_FAIL = -1U,
	64	BLK_MQ_TAG_MIN = BLK_MQ_TAG_CACHE_MIN,
	65	BLK_MQ_TAG_MAX = BLK_MQ_TAG_FAIL - 1,
	66	};
	67
	68	#endif