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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 |