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authorDeng-Cheng Zhu <dengcheng.zhu@imgtec.com>2015-03-07 19:30:29 +0100
committerRalf Baechle <ralf@linux-mips.org>2015-04-01 17:21:29 +0200
commitc41cef36530a4b4afa79981e8f1a31f49b871a90 (patch)
treecce66d8610b258f13633e6091ddc4d4a4bbdeb07 /arch/mips/sgi-ip27
parentMIPS: csrc-ioasic: Implement read_sched_clock (diff)
downloadlinux-c41cef36530a4b4afa79981e8f1a31f49b871a90.tar.xz
linux-c41cef36530a4b4afa79981e8f1a31f49b871a90.zip
MIPS: sgi-ip27: Implement read_sched_clock
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@imgtec.com> Cc: linux-mips@linux-mips.org Cc: macro@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/9483/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/sgi-ip27')
-rw-r--r--arch/mips/sgi-ip27/ip27-timer.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/mips/sgi-ip27/ip27-timer.c b/arch/mips/sgi-ip27/ip27-timer.c
index 1d97eaba0c5f..a6d10f607f34 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)