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Date: Tue, 15 Feb 2011 20:20:04 -0800
From: John Stultz <john.stultz@...aro.org>
To: LKML <linux-kernel@...r.kernel.org>
Cc: John Stultz <john.stultz@...aro.org>,
Jamie Lokier <jamie@...reable.org>,
Thomas Gleixner <tglx@...utronix.de>,
Alexander Shishkin <virtuoso@...nd.org>,
Arve Hjønnevåg
<arve@...roid.com>
Subject: [PATCH 2/5] time: Introduce get_monotonic_boottime and ktime_get_boottime
This adds new functions that return the monotonic time since boot
(in other words, CLOCK_MONOTONIC + suspend time).
CC: Jamie Lokier <jamie@...reable.org>
CC: Thomas Gleixner <tglx@...utronix.de>
CC: Alexander Shishkin <virtuoso@...nd.org>
CC: Arve Hjønnevåg <arve@...roid.com>
Signed-off-by: John Stultz <john.stultz@...aro.org>
---
include/linux/hrtimer.h | 1 +
include/linux/time.h | 1 +
kernel/time/timekeeping.c | 51 ++++++++++++++++++++++++++++++++++++++++++++-
3 files changed, 52 insertions(+), 1 deletions(-)
diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
index 20b8e66..7a9e7ee 100644
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -312,6 +312,7 @@ static inline int hrtimer_is_hres_active(struct hrtimer *timer)
extern ktime_t ktime_get(void);
extern ktime_t ktime_get_real(void);
+extern ktime_t ktime_get_boottime(void);
DECLARE_PER_CPU(struct tick_device, tick_cpu_device);
diff --git a/include/linux/time.h b/include/linux/time.h
index 379b903..fa39150 100644
--- a/include/linux/time.h
+++ b/include/linux/time.h
@@ -161,6 +161,7 @@ extern void getnstime_raw_and_real(struct timespec *ts_raw,
struct timespec *ts_real);
extern void getboottime(struct timespec *ts);
extern void monotonic_to_bootbased(struct timespec *ts);
+extern void get_monotonic_boottime(struct timespec *ts);
extern struct timespec timespec_trunc(struct timespec t, unsigned gran);
extern int timekeeping_valid_for_hres(void);
diff --git a/kernel/time/timekeeping.c b/kernel/time/timekeeping.c
index 6262c1d..5fbd9aa 100644
--- a/kernel/time/timekeeping.c
+++ b/kernel/time/timekeeping.c
@@ -907,7 +907,7 @@ static void update_wall_time(void)
* getboottime - Return the real time of system boot.
* @ts: pointer to the timespec to be set
*
- * Returns the time of day in a timespec.
+ * Returns the wall-time of boot in a timespec.
*
* This is based on the wall_to_monotonic offset and the total suspend
* time. Calls to settimeofday will affect the value returned (which
@@ -925,6 +925,55 @@ void getboottime(struct timespec *ts)
}
EXPORT_SYMBOL_GPL(getboottime);
+
+/**
+ * get_monotonic_boottime - Returns monotonic time since boot
+ * @ts: pointer to the timespec to be set
+ *
+ * Returns the monotonic time since boot in a timespec.
+ *
+ * This is similar to CLOCK_MONTONIC/ktime_get_ts, but also
+ * includes the time spent in suspend.
+ */
+void get_monotonic_boottime(struct timespec *ts)
+{
+ struct timespec tomono, sleep;
+ unsigned int seq;
+ s64 nsecs;
+
+ WARN_ON(timekeeping_suspended);
+
+ do {
+ seq = read_seqbegin(&xtime_lock);
+ *ts = xtime;
+ tomono = wall_to_monotonic;
+ sleep = total_sleep_time;
+ nsecs = timekeeping_get_ns();
+
+ } while (read_seqretry(&xtime_lock, seq));
+
+ set_normalized_timespec(ts, ts->tv_sec + tomono.tv_sec + sleep.tv_sec,
+ ts->tv_nsec + tomono.tv_nsec + sleep.tv_nsec + nsecs);
+}
+EXPORT_SYMBOL_GPL(get_monotonic_boottime);
+
+/**
+ * ktime_get_boottime - Returns monotonic time since boot in a ktime
+ *
+ * Returns the monotonic time since boot in a ktime
+ *
+ * This is similar to CLOCK_MONTONIC/ktime_get, but also
+ * includes the time spent in suspend.
+ */
+ktime_t ktime_get_boottime(void)
+{
+ struct timespec ts;
+
+ get_monotonic_boottime(&ts);
+ return timespec_to_ktime(ts);
+}
+EXPORT_SYMBOL_GPL(ktime_get_boottime);
+
/**
* monotonic_to_bootbased - Convert the monotonic time to boot based.
* @ts: pointer to the timespec to be converted
--
1.7.3.2.146.gca209
--
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