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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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3
include/linux/timekeeper_internal.h
View file

@ -54,6 +54,9 @@ struct timekeeper {
/* The current UTC to TAI offset in seconds */
s32 tai_offset;
/* Monotonic raw base time */
ktime_t base_raw;
/* The raw monotonic time for the CLOCK_MONOTONIC_RAW posix clock. */
struct timespec64 raw_time;

6
include/linux/timekeeping.h
View file

@ -107,6 +107,7 @@ enum tk_offsets {
extern ktime_t ktime_get(void);
extern ktime_t ktime_get_with_offset(enum tk_offsets offs);
extern ktime_t ktime_mono_to_any(ktime_t tmono, enum tk_offsets offs);
extern ktime_t ktime_get_raw(void);
/**
* ktime_get_real - get the real (wall-) time in ktime_t format
@ -158,6 +159,11 @@ static inline u64 ktime_get_boot_ns(void)
return ktime_to_ns(ktime_get_boottime());
}
static inline u64 ktime_get_raw_ns(void)
{
return ktime_to_ns(ktime_get_raw());
}
/*
* Timespec interfaces utilizing the ktime based ones
*/

25
kernel/time/timekeeping.c
View file

@ -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);