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Commit c41cef36 authored by Deng-Cheng Zhu's avatar Deng-Cheng Zhu Committed by Ralf Baechle
Browse files

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: default avatarDeng-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: default avatarRalf Baechle <ralf@linux-mips.org>
parent 7cb24b70

arch/mips/sgi-ip27/ip27-timer.c

+8 −0
Original line number Diff line number Diff line
@@ -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)