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 43