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authorDeng-Cheng Zhu <dengcheng.zhu@imgtec.com>2015-03-07 10:30:24 -0800
committerRalf Baechle <ralf@linux-mips.org>2015-04-01 17:21:27 +0200
commite9cef549c34603cd312cf536d8b624243a7963d4 (patch)
treeb7164311f3e6f03ee555ed41798035d9184e1ac0 /arch/mips/kernel/csrc-r4k.c
parent929de4cc9719398f3a7246854b6c254070e18b0a (diff)
MIPS: csrc-r4k: Implement read_sched_clock
Use c0 count register 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/9478/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/kernel/csrc-r4k.c')
-rw-r--r--arch/mips/kernel/csrc-r4k.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/mips/kernel/csrc-r4k.c b/arch/mips/kernel/csrc-r4k.c
index decd1fa38d55..e5ed7ada1433 100644
--- a/arch/mips/kernel/csrc-r4k.c
+++ b/arch/mips/kernel/csrc-r4k.c
@@ -7,6 +7,7 @@
*/
#include <linux/clocksource.h>
#include <linux/init.h>
+#include <linux/sched_clock.h>
#include <asm/time.h>
@@ -22,6 +23,11 @@ static struct clocksource clocksource_mips = {
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
};
+static u64 notrace r4k_read_sched_clock(void)
+{
+ return read_c0_count();
+}
+
int __init init_r4k_clocksource(void)
{
if (!cpu_has_counter || !mips_hpt_frequency)
@@ -32,5 +38,7 @@ int __init init_r4k_clocksource(void)
clocksource_register_hz(&clocksource_mips, mips_hpt_frequency);
+ sched_clock_register(r4k_read_sched_clock, 32, mips_hpt_frequency);
+
return 0;
}