Use txx9 up-counter for sched_clock source. This implementation will give
high resolution cputime accounting.
Signed-off-by: Deng-Cheng Zhu <dengcheng.zhu@xxxxxxxxxx>
---
arch/mips/kernel/cevt-txx9.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/arch/mips/kernel/cevt-txx9.c b/arch/mips/kernel/cevt-txx9.c
index 2ae0846..7239324 100644
--- a/arch/mips/kernel/cevt-txx9.c
+++ b/arch/mips/kernel/cevt-txx9.c
@@ -14,6 +14,7 @@
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
+#include <linux/sched_clock.h>
#include <asm/time.h>
#include <asm/txx9tmr.h>
@@ -46,6 +47,11 @@ static struct txx9_clocksource txx9_clocksource = {
},
};
+static u64 notrace txx9_read_sched_clock(void)
+{
+ return __raw_readl(&txx9_clocksource.tmrptr->trr);
+}
+
void __init txx9_clocksource_init(unsigned long baseaddr,
unsigned int imbusclk)
{
@@ -61,6 +67,9 @@ void __init txx9_clocksource_init(unsigned long baseaddr,
__raw_writel(1 << TXX9_CLOCKSOURCE_BITS, &tmrptr->cpra);
__raw_writel(TCR_BASE | TXx9_TMTCR_TCE, &tmrptr->tcr);
txx9_clocksource.tmrptr = tmrptr;
+
+ sched_clock_register(txx9_read_sched_clock, TXX9_CLOCKSOURCE_BITS,
+ TIMER_CLK(imbusclk));
}
struct txx9_clock_event_device {
--
1.8.5.3
