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authorChristopher S. Hall <christopher.s.hall@intel.com>2016-02-22 14:15:20 +0300
committerJohn Stultz <john.stultz@linaro.org>2016-03-03 04:12:50 +0300
commit9da0f49c8767cc0ef6101cb21156cf4380ed50dd (patch)
tree7dd2fd5c04980c3ffa520161975ee94169a3ee9e /include/linux/timekeeping.h
parent6bd58f09e1d8cc6c50a824c00bf0d617919986a1 (diff)
downloadlinux-9da0f49c8767cc0ef6101cb21156cf4380ed50dd.tar.xz
time: Add timekeeping snapshot code capturing system time and counter
In the current timekeeping code there isn't any interface to atomically capture the current relationship between the system counter and system time. ktime_get_snapshot() returns this triple (counter, monotonic raw, realtime) in the system_time_snapshot struct. Cc: Prarit Bhargava <prarit@redhat.com> Cc: Richard Cochran <richardcochran@gmail.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Ingo Molnar <mingo@kernel.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: kevin.b.stanton@intel.com Cc: kevin.j.clarke@intel.com Cc: hpa@zytor.com Cc: jeffrey.t.kirsher@intel.com Cc: netdev@vger.kernel.org Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Christopher S. Hall <christopher.s.hall@intel.com> [jstultz: Moved structure definitions around to clean things up, fixed cycles_t/cycle_t confusion.] Signed-off-by: John Stultz <john.stultz@linaro.org>
Diffstat (limited to 'include/linux/timekeeping.h')
-rw-r--r--include/linux/timekeeping.h18
1 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/timekeeping.h b/include/linux/timekeeping.h
index ec89d846324c..7817591af46f 100644
--- a/include/linux/timekeeping.h
+++ b/include/linux/timekeeping.h
@@ -267,6 +267,24 @@ extern void ktime_get_raw_and_real_ts64(struct timespec64 *ts_raw,
struct timespec64 *ts_real);
/*
+ * struct system_time_snapshot - simultaneous raw/real time capture with
+ * counter value
+ * @cycles: Clocksource counter value to produce the system times
+ * @real: Realtime system time
+ * @raw: Monotonic raw system time
+ */
+struct system_time_snapshot {
+ cycle_t cycles;
+ ktime_t real;
+ ktime_t raw;
+};
+
+/*
+ * Simultaneously snapshot realtime and monotonic raw clocks
+ */
+extern void ktime_get_snapshot(struct system_time_snapshot *systime_snapshot);
+
+/*
* Persistent clock related interfaces
*/
extern int persistent_clock_is_local;