[PATCH v2 11/17] MIPS: sgi-ip27: Implement read_sched_clock

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Use ip27 hub real time counter for sched_clock source. This implementation
will give high resolution cputime accounting.

Signed-off-by: Deng-Cheng Zhu <dengcheng.zhu@xxxxxxxxxx>
---
 arch/mips/sgi-ip27/ip27-timer.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/mips/sgi-ip27/ip27-timer.c b/arch/mips/sgi-ip27/ip27-timer.c
index 1d97eab..a6d10f6 100644
--- a/arch/mips/sgi-ip27/ip27-timer.c
+++ b/arch/mips/sgi-ip27/ip27-timer.c
@@ -7,6 +7,7 @@
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/sched.h>
+#include <linux/sched_clock.h>
 #include <linux/interrupt.h>
 #include <linux/kernel_stat.h>
 #include <linux/param.h>
@@ -159,11 +160,18 @@ struct clocksource hub_rt_clocksource = {
 	.flags	= CLOCK_SOURCE_IS_CONTINUOUS,
 };
 
+static u64 notrace hub_rt_read_sched_clock(void)
+{
+	return REMOTE_HUB_L(cputonasid(0), PI_RT_COUNT);
+}
+
 static void __init hub_rt_clocksource_init(void)
 {
 	struct clocksource *cs = &hub_rt_clocksource;
 
 	clocksource_register_hz(cs, CYCLES_PER_SEC);
+
+	sched_clock_register(hub_rt_read_sched_clock, 52, CYCLES_PER_SEC);
 }
 
 void __init plat_time_init(void)
-- 
2.3.2






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