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irqchip/gic: Convert to hotplug state machine 

More or less straightforward, although this driver sports some very
interesting SMP setup code. Regarding the callback ordering, this
deleted comment is interesting:

   ... the GIC needs to be up before the ARM generic timers.

That comment is half baken as the same requirement is true for perf.

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>
Acked-by: Jason Cooper <jason@lakedaemon.net>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20160713153333.069777215@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Richard Cochran 2016-07-13 17:16:04 +00:00 committed by Ingo Molnar
parent 07d36c9e84
commit 93131f7a9b
2 changed files with 7 additions and 17 deletions
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23
drivers/irqchip/irq-gic.c
View File

@ -984,25 +984,12 @@ static int gic_irq_domain_translate(struct irq_domain *d,
return -EINVAL;
}
#ifdef CONFIG_SMP
static int gic_secondary_init(struct notifier_block *nfb, unsigned long action,
void *hcpu)
static int gic_starting_cpu(unsigned int cpu)
{
if (action == CPU_STARTING || action == CPU_STARTING_FROZEN)
gic_cpu_init(&gic_data[0]);
return NOTIFY_OK;
gic_cpu_init(&gic_data[0]);
return 0;
}
/*
* Notifier for enabling the GIC CPU interface. Set an arbitrarily high
* priority because the GIC needs to be up before the ARM generic timers.
*/
static struct notifier_block gic_cpu_notifier = {
.notifier_call = gic_secondary_init,
.priority = 100,
};
#endif
static int gic_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
unsigned int nr_irqs, void *arg)
{
@ -1148,8 +1135,10 @@ static int __init __gic_init_bases(struct gic_chip_data *gic, int irq_start,
gic_cpu_map[i] = 0xff;
#ifdef CONFIG_SMP
set_smp_cross_call(gic_raise_softirq);
register_cpu_notifier(&gic_cpu_notifier);
#endif
cpuhp_setup_state_nocalls(CPUHP_AP_IRQ_GIC_STARTING,
"AP_IRQ_GIC_STARTING",
gic_starting_cpu, NULL);
set_handle_irq(gic_handle_irq);
if (static_key_true(&supports_deactivate))
pr_info("GIC: Using split EOI/Deactivate mode\n");

1
include/linux/cpuhotplug.h
View File

@ -9,6 +9,7 @@ enum cpuhp_state {
CPUHP_AP_IDLE_DEAD,
CPUHP_AP_OFFLINE,
CPUHP_AP_SCHED_STARTING,
CPUHP_AP_IRQ_GIC_STARTING,
CPUHP_AP_NOTIFY_STARTING,
CPUHP_AP_ONLINE,
CPUHP_TEARDOWN_CPU,