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clocksource/drivers/mips-gic-timer: Add fastpath for local timer updates 

Always accessing the compare register via the CM redirect region is
(relatively) slow. If the timer being updated is the current CPUs
then this can be shortcutted by writing to the CM VP local region.

Signed-off-by: Matt Redfearn <matt.redfearn@mips.com>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
This commit is contained in:
Matt Redfearn 2017-10-19 12:55:35 +01:00 committed by Daniel Lezcano
parent 7957b07b55
commit f16ff2bdb1
1 changed files with 7 additions and 2 deletions
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drivers/clocksource/mips-gic-timer.c
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@ -39,13 +39,18 @@ static u64 notrace gic_read_count(void)
static int gic_next_event(unsigned long delta, struct clock_event_device *evt)
{
int cpu = cpumask_first(evt->cpumask);
u64 cnt;
int res;
cnt = gic_read_count();
cnt += (u64)delta;
write_gic_vl_other(mips_cm_vp_id(cpumask_first(evt->cpumask)));
write_gic_vo_compare(cnt);
if (cpu == raw_smp_processor_id()) {
write_gic_vl_compare(cnt);
} else {
write_gic_vl_other(mips_cm_vp_id(cpu));
write_gic_vo_compare(cnt);
}
res = ((int)(gic_read_count() - cnt) >= 0) ? -ETIME : 0;
return res;
}