diff options
| author | Richard Cochran <rcochran@linutronix.de> | 2016-07-13 17:16:39 +0000 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-07-15 10:40:24 +0200 |
| commit | 7e86e8bd8dd67649d176e08d8dfb90039f0a1e98 (patch) | |
| tree | 27d075e1a8d404276455061b6756efc4156e4b15 /drivers/clocksource | |
| parent | e1272f541c6ad476426ef24b56b4e1d3403db513 (diff) | |
clocksource/arm_arch_timer: 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/20160713153336.048259040@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'drivers/clocksource')
| -rw-r--r-- | drivers/clocksource/arm_arch_timer.c | 54 |
1 files changed, 26 insertions, 28 deletions
diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c index 5effd3027319..28bce3f4f81d 100644 --- a/drivers/clocksource/arm_arch_timer.c +++ b/drivers/clocksource/arm_arch_timer.c @@ -370,8 +370,10 @@ static bool arch_timer_has_nonsecure_ppi(void) arch_timer_ppi[PHYS_NONSECURE_PPI]); } -static int arch_timer_setup(struct clock_event_device *clk) +static int arch_timer_starting_cpu(unsigned int cpu) { + struct clock_event_device *clk = this_cpu_ptr(arch_timer_evt); + __arch_timer_setup(ARCH_CP15_TIMER, clk); enable_percpu_irq(arch_timer_ppi[arch_timer_uses_ppi], 0); @@ -527,29 +529,14 @@ static void arch_timer_stop(struct clock_event_device *clk) clk->set_state_shutdown(clk); } -static int arch_timer_cpu_notify(struct notifier_block *self, - unsigned long action, void *hcpu) +static int arch_timer_dying_cpu(unsigned int cpu) { - /* - * Grab cpu pointer in each case to avoid spurious - * preemptible warnings - */ - switch (action & ~CPU_TASKS_FROZEN) { - case CPU_STARTING: - arch_timer_setup(this_cpu_ptr(arch_timer_evt)); - break; - case CPU_DYING: - arch_timer_stop(this_cpu_ptr(arch_timer_evt)); - break; - } + struct clock_event_device *clk = this_cpu_ptr(arch_timer_evt); - return NOTIFY_OK; + arch_timer_stop(clk); + return 0; } -static struct notifier_block arch_timer_cpu_nb = { - .notifier_call = arch_timer_cpu_notify, -}; - #ifdef CONFIG_CPU_PM static unsigned int saved_cntkctl; static int arch_timer_cpu_pm_notify(struct notifier_block *self, @@ -570,11 +557,21 @@ static int __init arch_timer_cpu_pm_init(void) { return cpu_pm_register_notifier(&arch_timer_cpu_pm_notifier); } + +static void __init arch_timer_cpu_pm_deinit(void) +{ + WARN_ON(cpu_pm_unregister_notifier(&arch_timer_cpu_pm_notifier)); +} + #else static int __init arch_timer_cpu_pm_init(void) { return 0; } + +static void __init arch_timer_cpu_pm_deinit(void) +{ +} #endif static int __init arch_timer_register(void) @@ -621,22 +618,23 @@ static int __init arch_timer_register(void) goto out_free; } - err = register_cpu_notifier(&arch_timer_cpu_nb); - if (err) - goto out_free_irq; - err = arch_timer_cpu_pm_init(); if (err) goto out_unreg_notify; - /* Immediately configure the timer on the boot CPU */ - arch_timer_setup(this_cpu_ptr(arch_timer_evt)); + /* Register and immediately configure the timer on the boot CPU */ + err = cpuhp_setup_state(CPUHP_AP_ARM_ARCH_TIMER_STARTING, + "AP_ARM_ARCH_TIMER_STARTING", + arch_timer_starting_cpu, arch_timer_dying_cpu); + if (err) + goto out_unreg_cpupm; return 0; +out_unreg_cpupm: + arch_timer_cpu_pm_deinit(); + out_unreg_notify: - unregister_cpu_notifier(&arch_timer_cpu_nb); -out_free_irq: free_percpu_irq(arch_timer_ppi[arch_timer_uses_ppi], arch_timer_evt); if (arch_timer_has_nonsecure_ppi()) free_percpu_irq(arch_timer_ppi[PHYS_NONSECURE_PPI], |