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clocksource/exynos_mct: 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: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Cc: Kukjin Kim <kgene@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-samsung-soc@vger.kernel.org
Cc: rt@linutronix.de
Link: http://lkml.kernel.org/r/20160713153338.147940411@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Richard Cochran 2016-07-13 17:17:05 +00:00 committed by Ingo Molnar
parent b8a12296ac
commit d11b3a60fc
2 changed files with 13 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

46
drivers/clocksource/exynos_mct.c
View File

@ -443,10 +443,11 @@ static irqreturn_t exynos4_mct_tick_isr(int irq, void *dev_id)
return IRQ_HANDLED;
}
static int exynos4_local_timer_setup(struct mct_clock_event_device *mevt)
static int exynos4_mct_starting_cpu(unsigned int cpu)
{
struct mct_clock_event_device *mevt =
per_cpu_ptr(&percpu_mct_tick, cpu);
struct clock_event_device *evt = &mevt->evt;
unsigned int cpu = smp_processor_id();
mevt->base = EXYNOS4_MCT_L_BASE(cpu);
snprintf(mevt->name, sizeof(mevt->name), "mct_tick%d", cpu);
@ -480,8 +481,10 @@ static int exynos4_local_timer_setup(struct mct_clock_event_device *mevt)
return 0;
}
static void exynos4_local_timer_stop(struct mct_clock_event_device *mevt)
static int exynos4_mct_dying_cpu(unsigned int cpu)
{
struct mct_clock_event_device *mevt =
per_cpu_ptr(&percpu_mct_tick, cpu);
struct clock_event_device *evt = &mevt->evt;
evt->set_state_shutdown(evt);
@ -491,39 +494,12 @@ static void exynos4_local_timer_stop(struct mct_clock_event_device *mevt)
} else {
disable_percpu_irq(mct_irqs[MCT_L0_IRQ]);
}
return 0;
}
static int exynos4_mct_cpu_notify(struct notifier_block *self,
unsigned long action, void *hcpu)
{
struct mct_clock_event_device *mevt;
/*
* Grab cpu pointer in each case to avoid spurious
* preemptible warnings
*/
switch (action & ~CPU_TASKS_FROZEN) {
case CPU_STARTING:
mevt = this_cpu_ptr(&percpu_mct_tick);
exynos4_local_timer_setup(mevt);
break;
case CPU_DYING:
mevt = this_cpu_ptr(&percpu_mct_tick);
exynos4_local_timer_stop(mevt);
break;
}
return NOTIFY_OK;
}
static struct notifier_block exynos4_mct_cpu_nb = {
.notifier_call = exynos4_mct_cpu_notify,
};
static int __init exynos4_timer_resources(struct device_node *np, void __iomem *base)
{
int err, cpu;
struct mct_clock_event_device *mevt = this_cpu_ptr(&percpu_mct_tick);
struct clk *mct_clk, *tick_clk;
tick_clk = np ? of_clk_get_by_name(np, "fin_pll") :
@ -570,12 +546,14 @@ static int __init exynos4_timer_resources(struct device_node *np, void __iomem *
}
}
err = register_cpu_notifier(&exynos4_mct_cpu_nb);
/* Install hotplug callbacks which configure the timer on this CPU */
err = cpuhp_setup_state(CPUHP_AP_EXYNOS4_MCT_TIMER_STARTING,
"AP_EXYNOS4_MCT_TIMER_STARTING",
exynos4_mct_starting_cpu,
exynos4_mct_dying_cpu);
if (err)
goto out_irq;
/* Immediately configure the timer on the boot CPU */
exynos4_local_timer_setup(mevt);
return 0;
out_irq:

1
include/linux/cpuhotplug.h
View File

@ -49,6 +49,7 @@ enum cpuhp_state {
CPUHP_AP_ARM_ARCH_TIMER_STARTING,
CPUHP_AP_ARM_GLOBAL_TIMER_STARTING,
CPUHP_AP_DUMMY_TIMER_STARTING,
CPUHP_AP_EXYNOS4_MCT_TIMER_STARTING,
CPUHP_AP_ARM_TWD_STARTING,
CPUHP_AP_METAG_TIMER_STARTING,
CPUHP_AP_QCOM_TIMER_STARTING,