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clocksource/atlas7: Convert to hotplug state machine

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Install the callbacks via the state machine and let the core invoke
the callbacks on the already online CPUs.

Signed-off-by: Richard Cochran <rcochran@linutronix.de>
Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Barry Song <baohua@kernel.org>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20160713153338.310333816@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Richard Cochran 2016-07-13 17:17:07 +00:00 committed by Ingo Molnar
parent 2c48fef74c
commit eb0a9d8c67
2 changed files with 10 additions and 32 deletions
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41
drivers/clocksource/timer-atlas7.c
View File

@ -172,9 +172,9 @@ static struct irqaction sirfsoc_timer1_irq = {
.handler = sirfsoc_timer_interrupt,
};
static int sirfsoc_local_timer_setup(struct clock_event_device *ce)
static int sirfsoc_local_timer_starting_cpu(unsigned int cpu)
{
int cpu = smp_processor_id();
struct clock_event_device *ce = per_cpu_ptr(sirfsoc_clockevent, cpu);
struct irqaction *action;
if (cpu == 0)
@ -203,50 +203,27 @@ static int sirfsoc_local_timer_setup(struct clock_event_device *ce)
return 0;
}
static void sirfsoc_local_timer_stop(struct clock_event_device *ce)
static int sirfsoc_local_timer_dying_cpu(unsigned int cpu)
{
int cpu = smp_processor_id();
sirfsoc_timer_count_disable(1);
if (cpu == 0)
remove_irq(sirfsoc_timer_irq.irq, &sirfsoc_timer_irq);
else
remove_irq(sirfsoc_timer1_irq.irq, &sirfsoc_timer1_irq);
return 0;
}
static int sirfsoc_cpu_notify(struct notifier_block *self,
unsigned long action, void *hcpu)
{
/*
* Grab cpu pointer in each case to avoid spurious
* preemptible warnings
*/
switch (action & ~CPU_TASKS_FROZEN) {
case CPU_STARTING:
sirfsoc_local_timer_setup(this_cpu_ptr(sirfsoc_clockevent));
break;
case CPU_DYING:
sirfsoc_local_timer_stop(this_cpu_ptr(sirfsoc_clockevent));
break;
}
return NOTIFY_OK;
}
static struct notifier_block sirfsoc_cpu_nb = {
.notifier_call = sirfsoc_cpu_notify,
};
static int __init sirfsoc_clockevent_init(void)
{
sirfsoc_clockevent = alloc_percpu(struct clock_event_device);
BUG_ON(!sirfsoc_clockevent);
BUG_ON(register_cpu_notifier(&sirfsoc_cpu_nb));
/* Immediately configure the timer on the boot CPU */
return sirfsoc_local_timer_setup(this_cpu_ptr(sirfsoc_clockevent));
/* Install and invoke hotplug callbacks */
return cpuhp_setup_state(CPUHP_AP_MARCO_TIMER_STARTING,
"AP_MARCO_TIMER_STARTING",
sirfsoc_local_timer_starting_cpu,
sirfsoc_local_timer_dying_cpu);
}
/* initialize the kernel jiffy timer source */

1
include/linux/cpuhotplug.h
View File

@ -54,6 +54,7 @@ enum cpuhp_state {
CPUHP_AP_METAG_TIMER_STARTING,
CPUHP_AP_QCOM_TIMER_STARTING,
CPUHP_AP_ARMADA_TIMER_STARTING,
CPUHP_AP_MARCO_TIMER_STARTING,
CPUHP_AP_MIPS_GIC_TIMER_STARTING,
CPUHP_AP_KVM_STARTING,
CPUHP_AP_KVM_ARM_VGIC_INIT_STARTING,