diff options
| -rw-r--r-- | include/linux/timekeeping.h | 18 | ||||
| -rw-r--r-- | kernel/time/timekeeping.c | 30 |
2 files changed, 48 insertions, 0 deletions
diff --git a/include/linux/timekeeping.h b/include/linux/timekeeping.h index ec89d846324c..7817591af46f 100644 --- a/include/linux/timekeeping.h +++ b/include/linux/timekeeping.h @@ -267,6 +267,24 @@ extern void ktime_get_raw_and_real_ts64(struct timespec64 *ts_raw, struct timespec64 *ts_real); /* + * struct system_time_snapshot - simultaneous raw/real time capture with + * counter value + * @cycles: Clocksource counter value to produce the system times + * @real: Realtime system time + * @raw: Monotonic raw system time + */ +struct system_time_snapshot { + cycle_t cycles; + ktime_t real; + ktime_t raw; +}; + +/* + * Simultaneously snapshot realtime and monotonic raw clocks + */ +extern void ktime_get_snapshot(struct system_time_snapshot *systime_snapshot); + +/* * Persistent clock related interfaces */ extern int persistent_clock_is_local; diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c index 4243d28177ac..89b4695bd083 100644 --- a/kernel/time/timekeeping.c +++ b/kernel/time/timekeeping.c @@ -874,6 +874,36 @@ time64_t __ktime_get_real_seconds(void) return tk->xtime_sec; } +/** + * ktime_get_snapshot - snapshots the realtime/monotonic raw clocks with counter + * @systime_snapshot: pointer to struct receiving the system time snapshot + */ +void ktime_get_snapshot(struct system_time_snapshot *systime_snapshot) +{ + struct timekeeper *tk = &tk_core.timekeeper; + unsigned long seq; + ktime_t base_raw; + ktime_t base_real; + s64 nsec_raw; + s64 nsec_real; + cycle_t now; + + do { + seq = read_seqcount_begin(&tk_core.seq); + + now = tk->tkr_mono.read(tk->tkr_mono.clock); + base_real = ktime_add(tk->tkr_mono.base, + tk_core.timekeeper.offs_real); + base_raw = tk->tkr_raw.base; + nsec_real = timekeeping_cycles_to_ns(&tk->tkr_mono, now); + nsec_raw = timekeeping_cycles_to_ns(&tk->tkr_raw, now); + } while (read_seqcount_retry(&tk_core.seq, seq)); + + systime_snapshot->cycles = now; + systime_snapshot->real = ktime_add_ns(base_real, nsec_real); + systime_snapshot->raw = ktime_add_ns(base_raw, nsec_raw); +} +EXPORT_SYMBOL_GPL(ktime_get_snapshot); #ifdef CONFIG_NTP_PPS |