diff options
| author | Deng-Cheng Zhu <dengcheng.zhu@imgtec.com> | 2015-03-07 10:30:29 -0800 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2015-04-01 17:21:29 +0200 |
| commit | c41cef36530a4b4afa79981e8f1a31f49b871a90 (patch) | |
| tree | cce66d8610b258f13633e6091ddc4d4a4bbdeb07 /arch/mips/sgi-ip27 | |
| parent | 7cb24b700349f4287f4104bb9f3266d7f383d4cc (diff) | |
| download | lwn-c41cef36530a4b4afa79981e8f1a31f49b871a90.tar.gz lwn-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.c | 8 |
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) |