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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@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>
This commit is contained in:
Deng-Cheng Zhu
2015-03-07 10:30:29 -08:00
committed by Ralf Baechle
parent 7cb24b7003
commit c41cef3653
1 changed files with 8 additions and 0 deletions
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8
arch/mips/sgi-ip27/ip27-timer.c
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@@ -7,6 +7,7 @@
#include <linux/init.h> #include <linux/init.h>
#include <linux/kernel.h> #include <linux/kernel.h>
#include <linux/sched.h> #include <linux/sched.h>
#include <linux/sched_clock.h>
#include <linux/interrupt.h> #include <linux/interrupt.h>
#include <linux/kernel_stat.h> #include <linux/kernel_stat.h>
#include <linux/param.h> #include <linux/param.h>
@@ -159,11 +160,18 @@ struct clocksource hub_rt_clocksource = {
.flags = CLOCK_SOURCE_IS_CONTINUOUS, .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) static void __init hub_rt_clocksource_init(void)
{ {
struct clocksource *cs = &hub_rt_clocksource; struct clocksource *cs = &hub_rt_clocksource;
clocksource_register_hz(cs, CYCLES_PER_SEC); 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) void __init plat_time_init(void)