Merge branch 'linus' into timers/core

[platform/adaptation/renesas_rcar/renesas_kernel.git] / kernel / time / timekeeping.c

diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index e8c77d9..02c0b2c 100644 (file)
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -125,6 +125,75 @@ void getnstimeofday(struct timespec *ts)
 
 EXPORT_SYMBOL(getnstimeofday);
 
+ktime_t ktime_get(void)
+{
+       cycle_t cycle_now, cycle_delta;
+       unsigned int seq;
+       s64 secs, nsecs;
+
+       WARN_ON(timekeeping_suspended);
+
+       do {
+               seq = read_seqbegin(&xtime_lock);
+               secs = xtime.tv_sec + wall_to_monotonic.tv_sec;
+               nsecs = xtime.tv_nsec + wall_to_monotonic.tv_nsec;
+
+               /* read clocksource: */
+               cycle_now = clocksource_read(clock);
+
+               /* calculate the delta since the last update_wall_time: */
+               cycle_delta = (cycle_now - clock->cycle_last) & clock->mask;
+
+               /* convert to nanoseconds: */
+               nsecs += cyc2ns(clock, cycle_delta);
+
+       } while (read_seqretry(&xtime_lock, seq));
+       /*
+        * Use ktime_set/ktime_add_ns to create a proper ktime on
+        * 32-bit architectures without CONFIG_KTIME_SCALAR.
+        */
+       return ktime_add_ns(ktime_set(secs, 0), nsecs);
+}
+EXPORT_SYMBOL_GPL(ktime_get);
+
+/**
+ * ktime_get_ts - get the monotonic clock in timespec format
+ * @ts:                pointer to timespec variable
+ *
+ * The function calculates the monotonic clock from the realtime
+ * clock and the wall_to_monotonic offset and stores the result
+ * in normalized timespec format in the variable pointed to by @ts.
+ */
+void ktime_get_ts(struct timespec *ts)
+{
+       cycle_t cycle_now, cycle_delta;
+       struct timespec tomono;
+       unsigned int seq;
+       s64 nsecs;
+
+       WARN_ON(timekeeping_suspended);
+
+       do {
+               seq = read_seqbegin(&xtime_lock);
+               *ts = xtime;
+               tomono = wall_to_monotonic;
+
+               /* read clocksource: */
+               cycle_now = clocksource_read(clock);
+
+               /* calculate the delta since the last update_wall_time: */
+               cycle_delta = (cycle_now - clock->cycle_last) & clock->mask;
+
+               /* convert to nanoseconds: */
+               nsecs = cyc2ns(clock, cycle_delta);
+
+       } while (read_seqretry(&xtime_lock, seq));
+
+       set_normalized_timespec(ts, ts->tv_sec + tomono.tv_sec,
+                               ts->tv_nsec + tomono.tv_nsec + nsecs);
+}
+EXPORT_SYMBOL_GPL(ktime_get_ts);
+
 /**
  * do_gettimeofday - Returns the time of day in a timeval
  * @tv:                pointer to the timeval to be set
@@ -221,10 +290,65 @@ static void change_clocksource(void)
               clock->name);
         */
 }
-#else
+#else /* GENERIC_TIME */
 static inline void clocksource_forward_now(void) { }
 static inline void change_clocksource(void) { }
-#endif
+
+/**
+ * ktime_get - get the monotonic time in ktime_t format
+ *
+ * returns the time in ktime_t format
+ */
+ktime_t ktime_get(void)
+{
+       struct timespec now;
+
+       ktime_get_ts(&now);
+
+       return timespec_to_ktime(now);
+}
+EXPORT_SYMBOL_GPL(ktime_get);
+
+/**
+ * ktime_get_ts - get the monotonic clock in timespec format
+ * @ts:                pointer to timespec variable
+ *
+ * The function calculates the monotonic clock from the realtime
+ * clock and the wall_to_monotonic offset and stores the result
+ * in normalized timespec format in the variable pointed to by @ts.
+ */
+void ktime_get_ts(struct timespec *ts)
+{
+       struct timespec tomono;
+       unsigned long seq;
+
+       do {
+               seq = read_seqbegin(&xtime_lock);
+               getnstimeofday(ts);
+               tomono = wall_to_monotonic;
+
+       } while (read_seqretry(&xtime_lock, seq));
+
+       set_normalized_timespec(ts, ts->tv_sec + tomono.tv_sec,
+                               ts->tv_nsec + tomono.tv_nsec);
+}
+EXPORT_SYMBOL_GPL(ktime_get_ts);
+#endif /* !GENERIC_TIME */
+
+/**
+ * ktime_get_real - get the real (wall-) time in ktime_t format
+ *
+ * returns the time in ktime_t format
+ */
+ktime_t ktime_get_real(void)
+{
+       struct timespec now;
+
+       getnstimeofday(&now);
+
+       return timespec_to_ktime(now);
+}
+EXPORT_SYMBOL_GPL(ktime_get_real);
 
 /**
  * getrawmonotonic - Returns the raw monotonic time in a timespec