timekeeping: Add CLOCK_TAI clockid
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>
diff --git a/include/linux/time.h b/include/linux/time.h
index 47210a1..22d81b3 100644
--- a/include/linux/time.h
+++ b/include/linux/time.h
@@ -183,6 +183,7 @@
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 *);
diff --git a/include/uapi/linux/time.h b/include/uapi/linux/time.h
index 0d3c0ed..e75e1b6 100644
--- a/include/uapi/linux/time.h
+++ b/include/uapi/linux/time.h
@@ -54,11 +54,9 @@
#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
diff --git a/kernel/posix-timers.c b/kernel/posix-timers.c
index 6edbb2c..fbfc5f1 100644
--- a/kernel/posix-timers.c
+++ b/kernel/posix-timers.c
@@ -221,6 +221,11 @@
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 @@
.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 @@
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,
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 937098a..8a84275 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -379,6 +379,36 @@
}
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
/**