diff options
| author | Deng-Cheng Zhu <dengcheng.zhu@imgtec.com> | 2015-03-07 10:30:24 -0800 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2015-04-01 17:21:27 +0200 |
| commit | e9cef549c34603cd312cf536d8b624243a7963d4 (patch) | |
| tree | b7164311f3e6f03ee555ed41798035d9184e1ac0 /arch | |
| parent | 929de4cc9719398f3a7246854b6c254070e18b0a (diff) | |
| download | linux-e9cef549c34603cd312cf536d8b624243a7963d4.tar.bz2 | |
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')
| -rw-r--r-- | arch/mips/kernel/csrc-r4k.c | 8 |
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; } |