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>

diff --git a/arch/mips/kernel/csrc-r4k.c b/arch/mips/kernel/csrc-r4k.c
index decd1fa38d551bf132f9bba4aa2a48400e129ac8..e5ed7ada14334c682218aa567e18414465fea81c 100644 (file)
--- 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;
 }