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ARC/time: Convert to hotplug state machine

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Install the callbacks via the state machine.

Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: linux-snps-arc@lists.infradead.org
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20160713153338.391826254@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Anna-Maria Gleixner 2016-07-13 17:17:07 +00:00 committed by Ingo Molnar
parent eb0a9d8c67
commit ecd8081f6f
2 changed files with 19 additions and 30 deletions
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48
arch/arc/kernel/time.c
View File

@ -296,30 +296,23 @@ static irqreturn_t timer_irq_handler(int irq, void *dev_id)
return IRQ_HANDLED;
}
static int arc_timer_cpu_notify(struct notifier_block *self,
unsigned long action, void *hcpu)
static int arc_timer_starting_cpu(unsigned int cpu)
{
struct clock_event_device *evt = this_cpu_ptr(&arc_clockevent_device);
evt->cpumask = cpumask_of(smp_processor_id());
switch (action & ~CPU_TASKS_FROZEN) {
case CPU_STARTING:
clockevents_config_and_register(evt, arc_timer_freq,
0, ULONG_MAX);
enable_percpu_irq(arc_timer_irq, 0);
break;
case CPU_DYING:
disable_percpu_irq(arc_timer_irq);
break;
}
return NOTIFY_OK;
clockevents_config_and_register(evt, arc_timer_freq, 0, ARC_TIMER_MAX);
enable_percpu_irq(arc_timer_irq, 0);
return 0;
}
static struct notifier_block arc_timer_cpu_nb = {
.notifier_call = arc_timer_cpu_notify,
};
static int arc_timer_dying_cpu(unsigned int cpu)
{
disable_percpu_irq(arc_timer_irq);
return 0;
}
/*
* clockevent setup for boot CPU
@ -329,12 +322,6 @@ static int __init arc_clockevent_setup(struct device_node *node)
struct clock_event_device *evt = this_cpu_ptr(&arc_clockevent_device);
int ret;
ret = register_cpu_notifier(&arc_timer_cpu_nb);
if (ret) {
pr_err("Failed to register cpu notifier");
return ret;
}
arc_timer_irq = irq_of_parse_and_map(node, 0);
if (arc_timer_irq <= 0) {
pr_err("clockevent: missing irq");
@ -347,11 +334,6 @@ static int __init arc_clockevent_setup(struct device_node *node)
return ret;
}
evt->irq = arc_timer_irq;
evt->cpumask = cpumask_of(smp_processor_id());
clockevents_config_and_register(evt, arc_timer_freq,
0, ARC_TIMER_MAX);
/* Needs apriori irq_set_percpu_devid() done in intc map function */
ret = request_percpu_irq(arc_timer_irq, timer_irq_handler,
"Timer0 (per-cpu-tick)", evt);
@ -360,8 +342,14 @@ static int __init arc_clockevent_setup(struct device_node *node)
return ret;
}
enable_percpu_irq(arc_timer_irq, 0);
ret = cpuhp_setup_state(CPUHP_AP_ARC_TIMER_STARTING,
"AP_ARC_TIMER_STARTING",
arc_timer_starting_cpu,
arc_timer_dying_cpu);
if (ret) {
pr_err("Failed to setup hotplug state");
return ret;
}
return 0;
}

1
include/linux/cpuhotplug.h
View File

@ -56,6 +56,7 @@ enum cpuhp_state {
CPUHP_AP_ARMADA_TIMER_STARTING,
CPUHP_AP_MARCO_TIMER_STARTING,
CPUHP_AP_MIPS_GIC_TIMER_STARTING,
CPUHP_AP_ARC_TIMER_STARTING,
CPUHP_AP_KVM_STARTING,
CPUHP_AP_KVM_ARM_VGIC_INIT_STARTING,
CPUHP_AP_KVM_ARM_VGIC_STARTING,