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| author | Deng-Cheng Zhu <dengcheng.zhu@imgtec.com> | 2015-03-07 10:30:28 -0800 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2015-04-01 17:21:28 +0200 |
| commit | 7cb24b700349f4287f4104bb9f3266d7f383d4cc (patch) | |
| tree | 4953a11b939572e90f8e702201244b6ac143739c /arch/mips/kernel | |
| parent | 317adb12e5417167162bf7f8a3265c06ae9ef216 (diff) | |
| download | linux-7cb24b700349f4287f4104bb9f3266d7f383d4cc.tar.bz2 | |
MIPS: csrc-ioasic: Implement read_sched_clock
Use DEC I/O ASIC's free-running counter for sched_clock source. This
implementation will give high resolution cputime accounting.
Acked-by: Maciej W. Rozycki <macro@linux-mips.org>
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/9482/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/kernel')
| -rw-r--r-- | arch/mips/kernel/csrc-ioasic.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/mips/kernel/csrc-ioasic.c b/arch/mips/kernel/csrc-ioasic.c index 54e394df9f7a..722f5589cd1d 100644 --- a/arch/mips/kernel/csrc-ioasic.c +++ b/arch/mips/kernel/csrc-ioasic.c @@ -14,6 +14,7 @@ * GNU General Public License for more details. */ #include <linux/clocksource.h> +#include <linux/sched_clock.h> #include <linux/init.h> #include <asm/ds1287.h> @@ -33,6 +34,11 @@ static struct clocksource clocksource_dec = { .flags = CLOCK_SOURCE_IS_CONTINUOUS, }; +static u64 notrace dec_ioasic_read_sched_clock(void) +{ + return ioasic_read(IO_REG_FCTR); +} + int __init dec_ioasic_clocksource_init(void) { unsigned int freq; @@ -61,5 +67,8 @@ int __init dec_ioasic_clocksource_init(void) clocksource_dec.rating = 200 + freq / 10000000; clocksource_register_hz(&clocksource_dec, freq); + + sched_clock_register(dec_ioasic_read_sched_clock, 32, freq); + return 0; } |