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timekeeping: Provide ktime_get_raw()

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Provide a ktime_t based interface for raw monotonic time.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: John Stultz <john.stultz@linaro.org>
This commit is contained in:
Thomas Gleixner
2014-07-16 21:05:04 +00:00
committed by John Stultz
parent 2044fdb03e
commit f519b1a2e0
3 changed files with 34 additions and 0 deletions
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25
kernel/time/timekeeping.c
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@@ -305,6 +305,9 @@ static inline void tk_update_ktime_data(struct timekeeper *tk)
nsec *= NSEC_PER_SEC;
nsec += tk->wall_to_monotonic.tv_nsec;
tk->base_mono = ns_to_ktime(nsec);
/* Update the monotonic raw base */
tk->base_raw = timespec64_to_ktime(tk->raw_time);
}
/* must hold timekeeper_lock */
@@ -466,6 +469,27 @@ ktime_t ktime_mono_to_any(ktime_t tmono, enum tk_offsets offs)
}
EXPORT_SYMBOL_GPL(ktime_mono_to_any);
/**
* ktime_get_raw - Returns the raw monotonic time in ktime_t format
*/
ktime_t ktime_get_raw(void)
{
struct timekeeper *tk = &tk_core.timekeeper;
unsigned int seq;
ktime_t base;
s64 nsecs;
do {
seq = read_seqcount_begin(&tk_core.seq);
base = tk->base_raw;
nsecs = timekeeping_get_ns_raw(tk);
} while (read_seqcount_retry(&tk_core.seq, seq));
return ktime_add_ns(base, nsecs);
}
EXPORT_SYMBOL_GPL(ktime_get_raw);
/**
* ktime_get_ts64 - get the monotonic clock in timespec64 format
* @ts: pointer to timespec variable
@@ -878,6 +902,7 @@ void __init timekeeping_init(void)
tk_set_xtime(tk, &now);
tk->raw_time.tv_sec = 0;
tk->raw_time.tv_nsec = 0;
tk->base_raw.tv64 = 0;
if (boot.tv_sec == 0 && boot.tv_nsec == 0)
boot = tk_xtime(tk);