From c41cef36530a4b4afa79981e8f1a31f49b871a90 Mon Sep 17 00:00:00 2001 From: Deng-Cheng Zhu Date: Sat, 7 Mar 2015 10:30:29 -0800 Subject: [PATCH] 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 Cc: linux-mips@linux-mips.org Cc: macro@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/9483/ Signed-off-by: Ralf Baechle --- arch/mips/sgi-ip27/ip27-timer.c | 8 ++++++++ 1 file changed, 8 insertions(+) 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 #include #include +#include #include #include #include @@ -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) -- 2.20.1