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clocksource/armada-370-xp: Convert to hotplug state machine 

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: 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/20160713153338.229913786@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Richard Cochran 2016-07-13 17:17:06 +00:00 committed by Ingo Molnar
parent d11b3a60fc
commit 2c48fef74c
2 changed files with 12 additions and 30 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
drivers/clocksource/time-armada-370-xp.c
View File

@ -170,10 +170,10 @@ static irqreturn_t armada_370_xp_timer_interrupt(int irq, void *dev_id)
/*
* Setup the local clock events for a CPU.
*/
static int armada_370_xp_timer_setup(struct clock_event_device *evt)
static int armada_370_xp_timer_starting_cpu(unsigned int cpu)
{
struct clock_event_device *evt = per_cpu_ptr(armada_370_xp_evt, cpu);
u32 clr = 0, set = 0;
int cpu = smp_processor_id();
if (timer25Mhz)
set = TIMER0_25MHZ;
@ -200,35 +200,15 @@ static int armada_370_xp_timer_setup(struct clock_event_device *evt)
return 0;
}
static void armada_370_xp_timer_stop(struct clock_event_device *evt)
static int armada_370_xp_timer_dying_cpu(unsigned int cpu)
{
struct clock_event_device *evt = per_cpu_ptr(armada_370_xp_evt, cpu);
evt->set_state_shutdown(evt);
disable_percpu_irq(evt->irq);
return 0;
}
static int armada_370_xp_timer_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:
armada_370_xp_timer_setup(this_cpu_ptr(armada_370_xp_evt));
break;
case CPU_DYING:
armada_370_xp_timer_stop(this_cpu_ptr(armada_370_xp_evt));
break;
}
return NOTIFY_OK;
}
static struct notifier_block armada_370_xp_timer_cpu_nb = {
.notifier_call = armada_370_xp_timer_cpu_notify,
};
static u32 timer0_ctrl_reg, timer0_local_ctrl_reg;
static int armada_370_xp_timer_suspend(void)
@ -322,8 +302,6 @@ static int __init armada_370_xp_timer_common_init(struct device_node *np)
return res;
}
register_cpu_notifier(&armada_370_xp_timer_cpu_nb);
armada_370_xp_evt = alloc_percpu(struct clock_event_device);
if (!armada_370_xp_evt)
return -ENOMEM;
@ -341,9 +319,12 @@ static int __init armada_370_xp_timer_common_init(struct device_node *np)
return res;
}
res = armada_370_xp_timer_setup(this_cpu_ptr(armada_370_xp_evt));
res = cpuhp_setup_state(CPUHP_AP_ARMADA_TIMER_STARTING,
"AP_ARMADA_TIMER_STARTING",
armada_370_xp_timer_starting_cpu,
armada_370_xp_timer_dying_cpu);
if (res) {
pr_err("Failed to setup timer");
pr_err("Failed to setup hotplug state and timer");
return res;
}

1
include/linux/cpuhotplug.h
View File

@ -53,6 +53,7 @@ enum cpuhp_state {
CPUHP_AP_ARM_TWD_STARTING,
CPUHP_AP_METAG_TIMER_STARTING,
CPUHP_AP_QCOM_TIMER_STARTING,
CPUHP_AP_ARMADA_TIMER_STARTING,
CPUHP_AP_MIPS_GIC_TIMER_STARTING,
CPUHP_AP_KVM_STARTING,
CPUHP_AP_KVM_ARM_VGIC_INIT_STARTING,