block/blk-stat.h

   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