time: sched_clock: record cycle count in suspend and resume

Record cycle count and kernel time in ns while entering suspend
and while resuming. This will help in matching up the kernel time
with external subsystems and in recording suspend time in cycles.

Change-Id: If22d9880103c7d54087d0faf4c992259e6b97f08
Signed-off-by: Srinivas Ramana <sramana@codeaurora.org>

1 files changed, 11 insertions, 0 deletions

diff --git a/kernel/time/sched_clock.c b/kernel/time/sched_clock.c
index 0637823aa5a6..699aff70bbfa 100644
--- a/kernel/time/sched_clock.c
+++ b/kernel/time/sched_clock.c
@@ -71,6 +71,10 @@ struct clock_data {
 static struct hrtimer sched_clock_timer;
 static int irqtime = -1;
 static int initialized;
+static u64 suspend_ns;
+static u64 suspend_cycles;
+static u64 resume_cycles;
+
 
 core_param(irqtime, irqtime, int, 0400);
 
@@ -282,6 +286,11 @@ static int sched_clock_suspend(void)
 	struct clock_read_data *rd = &cd.read_data[0];
 
 	update_sched_clock();
+
+	suspend_ns = rd->epoch_ns;
+	suspend_cycles = rd->epoch_cyc;
+	pr_info("suspend ns:%17llu	suspend cycles:%17llu\n",
+				rd->epoch_ns, rd->epoch_cyc);
 	hrtimer_cancel(&sched_clock_timer);
 	rd->read_sched_clock = suspended_sched_clock_read;
 
@@ -293,6 +302,8 @@ static void sched_clock_resume(void)
 	struct clock_read_data *rd = &cd.read_data[0];
 
 	rd->epoch_cyc = cd.actual_read_sched_clock();
+	resume_cycles = rd->epoch_cyc;
+	pr_info("resume cycles:%17llu\n", rd->epoch_cyc);
 	hrtimer_start(&sched_clock_timer, cd.wrap_kt, HRTIMER_MODE_REL);
 	rd->read_sched_clock = cd.actual_read_sched_clock;
 }