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

#ifndef BLK_STAT_H
#define BLK_STAT_H

/*
 * ~0.13s window as a power-of-2 (2^27 nsecs)
 */
#define BLK_STAT_NSEC		134217728ULL
#define BLK_STAT_NSEC_MASK	~(BLK_STAT_NSEC - 1)

/*
 * Upper 3 bits can be used elsewhere
 */
#define BLK_STAT_RES_BITS	3
#define BLK_STAT_SHIFT		(64 - BLK_STAT_RES_BITS)
#define BLK_STAT_TIME_MASK	((1ULL << BLK_STAT_SHIFT) - 1)
#define BLK_STAT_MASK		~BLK_STAT_TIME_MASK

enum {
	BLK_STAT_READ	= 0,
	BLK_STAT_WRITE,
};

void blk_stat_add(struct blk_rq_stat *, struct request *);
void blk_hctx_stat_get(struct blk_mq_hw_ctx *, struct blk_rq_stat *);
void blk_queue_stat_get(struct request_queue *, struct blk_rq_stat *);
void blk_stat_clear(struct request_queue *);
void blk_stat_init(struct blk_rq_stat *);
bool blk_stat_is_current(struct blk_rq_stat *);
void blk_stat_set_issue_time(struct blk_issue_stat *);
bool blk_stat_enable(struct request_queue *);

static inline u64 __blk_stat_time(u64 time)
{
	return time & BLK_STAT_TIME_MASK;
}

static inline u64 blk_stat_time(struct blk_issue_stat *stat)
{
	return __blk_stat_time(stat->time);
}

#endif
Commit	Line	Data
cf43e6be JA	1	#ifndef BLK_STAT_H
	2	#define BLK_STAT_H
	3
	4	/*
	5	* ~0.13s window as a power-of-2 (2^27 nsecs)
	6	*/
	7	#define BLK_STAT_NSEC 134217728ULL
	8	#define BLK_STAT_NSEC_MASK ~(BLK_STAT_NSEC - 1)
	9
	10	/*
	11	* Upper 3 bits can be used elsewhere
	12	*/
	13	#define BLK_STAT_RES_BITS 3
	14	#define BLK_STAT_SHIFT (64 - BLK_STAT_RES_BITS)
	15	#define BLK_STAT_TIME_MASK ((1ULL << BLK_STAT_SHIFT) - 1)
	16	#define BLK_STAT_MASK ~BLK_STAT_TIME_MASK
	17
	18	enum {
	19	BLK_STAT_READ = 0,
	20	BLK_STAT_WRITE,
	21	};
	22
	23	void blk_stat_add(struct blk_rq_stat , struct request );
	24	void blk_hctx_stat_get(struct blk_mq_hw_ctx , struct blk_rq_stat );
	25	void blk_queue_stat_get(struct request_queue , struct blk_rq_stat );
	26	void blk_stat_clear(struct request_queue *);
	27	void blk_stat_init(struct blk_rq_stat *);
	28	bool blk_stat_is_current(struct blk_rq_stat *);
	29	void blk_stat_set_issue_time(struct blk_issue_stat *);
	30	bool blk_stat_enable(struct request_queue *);
	31
	32	static inline u64 __blk_stat_time(u64 time)
	33	{
	34	return time & BLK_STAT_TIME_MASK;
	35	}
	36
	37	static inline u64 blk_stat_time(struct blk_issue_stat *stat)
	38	{
	39	return __blk_stat_time(stat->time);
	40	}
	41
	42	#endif