diff options
| author | Richard Cochran <rcochran@linutronix.de> | 2016-07-13 20:17:05 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-07-15 11:41:44 +0300 |
| commit | d11b3a60fcc8c6e44dd370f1cf2738eb5bec7353 (patch) | |
| tree | 66875201bd823b31ffcb23986e864b06905d450f /drivers/clocksource | |
| parent | b8a12296ac812f829bd9392346b01b1872d8118b (diff) | |
| download | linux-d11b3a60fcc8c6e44dd370f1cf2738eb5bec7353.tar.xz | |
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>
Diffstat (limited to 'drivers/clocksource')
| -rw-r--r-- | drivers/clocksource/exynos_mct.c | 46 |
1 files changed, 12 insertions, 34 deletions
diff --git a/drivers/clocksource/exynos_mct.c b/drivers/clocksource/exynos_mct.c index 0d18dd4b3bd2..41840d02c331 100644 --- a/drivers/clocksource/exynos_mct.c +++ b/drivers/clocksource/exynos_mct.c @@ -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: |