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timekeeping: Add CLOCK_TAI clockid

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This add a CLOCK_TAI clockid and the needed accessors.

CC: Thomas Gleixner <tglx@linutronix.de>
CC: Eric Dumazet <eric.dumazet@gmail.com>
CC: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
This commit is contained in:
John Stultz 2012-05-03 12:43:40 -07:00
parent cc244ddae6
commit 1ff3c9677b
4 changed files with 43 additions and 4 deletions
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1
include/linux/time.h
View File

@ -183,6 +183,7 @@ extern u64 timekeeping_max_deferment(void);
extern int timekeeping_inject_offset(struct timespec *ts);
extern s32 timekeeping_get_tai_offset(void);
extern void timekeeping_set_tai_offset(s32 tai_offset);
extern void timekeeping_clocktai(struct timespec *ts);
struct tms;
extern void do_sys_times(struct tms *);

6
include/uapi/linux/time.h
View File

@ -54,11 +54,9 @@ struct itimerval {
#define CLOCK_BOOTTIME 7
#define CLOCK_REALTIME_ALARM 8
#define CLOCK_BOOTTIME_ALARM 9
#define CLOCK_SGI_CYCLE 10 /* Hardware specific */
#define CLOCK_TAI 11
/*
* The IDs of various hardware clocks:
*/
#define CLOCK_SGI_CYCLE 10
#define MAX_CLOCKS 16
#define CLOCKS_MASK (CLOCK_REALTIME | CLOCK_MONOTONIC)
#define CLOCKS_MONO CLOCK_MONOTONIC

10
kernel/posix-timers.c
View File

@ -221,6 +221,11 @@ static int posix_get_boottime(const clockid_t which_clock, struct timespec *tp)
return 0;
}
static int posix_get_tai(clockid_t which_clock, struct timespec *tp)
{
timekeeping_clocktai(tp);
return 0;
}
/*
* Initialize everything, well, just everything in Posix clocks/timers ;)
@ -261,6 +266,10 @@ static __init int init_posix_timers(void)
.clock_getres = posix_get_coarse_res,
.clock_get = posix_get_monotonic_coarse,
};
struct k_clock clock_tai = {
.clock_getres = hrtimer_get_res,
.clock_get = posix_get_tai,
};
struct k_clock clock_boottime = {
.clock_getres = hrtimer_get_res,
.clock_get = posix_get_boottime,
@ -278,6 +287,7 @@ static __init int init_posix_timers(void)
posix_timers_register_clock(CLOCK_REALTIME_COARSE, &clock_realtime_coarse);
posix_timers_register_clock(CLOCK_MONOTONIC_COARSE, &clock_monotonic_coarse);
posix_timers_register_clock(CLOCK_BOOTTIME, &clock_boottime);
posix_timers_register_clock(CLOCK_TAI, &clock_tai);
posix_timers_cache = kmem_cache_create("posix_timers_cache",
sizeof (struct k_itimer), 0, SLAB_PANIC,

30
kernel/time/timekeeping.c
View File

@ -379,6 +379,36 @@ void ktime_get_ts(struct timespec *ts)
}
EXPORT_SYMBOL_GPL(ktime_get_ts);
/**
* timekeeping_clocktai - Returns the TAI time of day in a timespec
* @ts: pointer to the timespec to be set
*
* Returns the time of day in a timespec.
*/
void timekeeping_clocktai(struct timespec *ts)
{
struct timekeeper *tk = &timekeeper;
unsigned long seq;
u64 nsecs;
WARN_ON(timekeeping_suspended);
do {
seq = read_seqbegin(&tk->lock);
ts->tv_sec = tk->xtime_sec + tk->tai_offset;
nsecs = timekeeping_get_ns(tk);
} while (read_seqretry(&tk->lock, seq));
ts->tv_nsec = 0;
timespec_add_ns(ts, nsecs);
}
EXPORT_SYMBOL(timekeeping_clocktai);
#ifdef CONFIG_NTP_PPS
/**