From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758823AbcGKMke (ORCPT ); Mon, 11 Jul 2016 08:40:34 -0400 Received: from www.linutronix.de ([62.245.132.108]:57274 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758671AbcGKMbA (ORCPT ); Mon, 11 Jul 2016 08:31:00 -0400 Message-Id: <20160711122533.836621791@linutronix.de> User-Agent: quilt/0.63-1 Date: Mon, 11 Jul 2016 12:28:49 -0000 From: Anna-Maria Gleixner To: LKML Cc: Peter Zijlstra , Ingo Molnar , Richard Cochran , Sebastian Andrzej Siewior , Srinivas Kandagatla , Maxime Coquelin , Patrice Chotard , Daniel Lezcano , linux-arm-kernel@lists.infradead.org, kernel@stlinux.com, Anna-Maria Gleixner Subject: [patch 38/66] clocksource/arm_global_timer: Convert to hotplug state machine. References: <20160711122450.923603742@linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Content-Disposition: inline; filename=0032-clocksource-arm_global_timer-Convert-to-hotplug-stat.patch X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001,URIBL_BLOCKED=0.001 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Richard Cochran Install the callbacks via the state machine and let the core invoke the callbacks on the already online CPUs. Signed-off-by: Richard Cochran Reviewed-by: Sebastian Andrzej Siewior Cc: Srinivas Kandagatla Cc: Maxime Coquelin Cc: Patrice Chotard Cc: Daniel Lezcano Cc: linux-arm-kernel@lists.infradead.org Cc: kernel@stlinux.com Signed-off-by: Anna-Maria Gleixner --- drivers/clocksource/arm_global_timer.c | 41 ++++++++------------------------- include/linux/cpuhotplug.h | 1 2 files changed, 11 insertions(+), 31 deletions(-) --- a/drivers/clocksource/arm_global_timer.c +++ b/drivers/clocksource/arm_global_timer.c @@ -165,9 +165,9 @@ static irqreturn_t gt_clockevent_interru return IRQ_HANDLED; } -static int gt_clockevents_init(struct clock_event_device *clk) +static int gt_starting_cpu(unsigned int cpu) { - int cpu = smp_processor_id(); + struct clock_event_device *clk = this_cpu_ptr(gt_evt); clk->name = "arm_global_timer"; clk->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT | @@ -186,10 +186,13 @@ static int gt_clockevents_init(struct cl return 0; } -static void gt_clockevents_stop(struct clock_event_device *clk) +static int gt_dying_cpu(unsigned int cpu) { + struct clock_event_device *clk = this_cpu_ptr(gt_evt); + gt_clockevent_shutdown(clk); disable_percpu_irq(clk->irq); + return 0; } static cycle_t gt_clocksource_read(struct clocksource *cs) @@ -252,24 +255,6 @@ static void __init gt_clocksource_init(v clocksource_register_hz(>_clocksource, gt_clk_rate); } -static int gt_cpu_notify(struct notifier_block *self, unsigned long action, - void *hcpu) -{ - switch (action & ~CPU_TASKS_FROZEN) { - case CPU_STARTING: - gt_clockevents_init(this_cpu_ptr(gt_evt)); - break; - case CPU_DYING: - gt_clockevents_stop(this_cpu_ptr(gt_evt)); - break; - } - - return NOTIFY_OK; -} -static struct notifier_block gt_cpu_nb = { - .notifier_call = gt_cpu_notify, -}; - static void __init global_timer_of_register(struct device_node *np) { struct clk *gt_clk; @@ -325,21 +310,15 @@ static void __init global_timer_of_regis goto out_free; } - err = register_cpu_notifier(>_cpu_nb); - if (err) { - pr_warn("global-timer: unable to register cpu notifier.\n"); - goto out_irq; - } - - /* Immediately configure the timer on the boot CPU */ + /* Register and immediately configure the timer on the boot CPU */ gt_clocksource_init(); - gt_clockevents_init(this_cpu_ptr(gt_evt)); + cpuhp_setup_state(CPUHP_AP_ARM_GLOBAL_TIMER_STARTING, + "AP_ARM_GLOBAL_TIMER_STARTING", gt_starting_cpu, + gt_dying_cpu); gt_delay_timer_init(); return; -out_irq: - free_percpu_irq(gt_ppi, gt_evt); out_free: free_percpu(gt_evt); out_clk: --- a/include/linux/cpuhotplug.h +++ b/include/linux/cpuhotplug.h @@ -38,6 +38,7 @@ enum cpuhp_state { CPUHP_AP_ARM_VFP_STARTING, CPUHP_AP_PERF_ARM_STARTING, CPUHP_AP_ARM_ARCH_TIMER_STARTING, + CPUHP_AP_ARM_GLOBAL_TIMER_STARTING, CPUHP_AP_KVM_STARTING, CPUHP_AP_NOTIFY_STARTING, CPUHP_AP_ONLINE,