cpuidle/coupled: Convert to hotplug state machine
Install the callbacks via the state machine. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Cc: linux-pm@vger.kernel.org Cc: Peter Zijlstra <peterz@infradead.org> Cc: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> Cc: rt@linutronix.de Link: http://lkml.kernel.org/r/20160824091444.brdr5zpbxjvh6n3f@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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@ -749,65 +749,52 @@ static void cpuidle_coupled_allow_idle(struct cpuidle_coupled *coupled)
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put_cpu();
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put_cpu();
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}
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}
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/**
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static int coupled_cpu_online(unsigned int cpu)
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* cpuidle_coupled_cpu_notify - notifier called during hotplug transitions
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* @nb: notifier block
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* @action: hotplug transition
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* @hcpu: target cpu number
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*
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* Called when a cpu is brought on or offline using hotplug. Updates the
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* coupled cpu set appropriately
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*/
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static int cpuidle_coupled_cpu_notify(struct notifier_block *nb,
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unsigned long action, void *hcpu)
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{
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{
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int cpu = (unsigned long)hcpu;
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struct cpuidle_device *dev;
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struct cpuidle_device *dev;
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switch (action & ~CPU_TASKS_FROZEN) {
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case CPU_UP_PREPARE:
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case CPU_DOWN_PREPARE:
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case CPU_ONLINE:
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case CPU_DEAD:
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case CPU_UP_CANCELED:
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case CPU_DOWN_FAILED:
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break;
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default:
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return NOTIFY_OK;
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}
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mutex_lock(&cpuidle_lock);
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mutex_lock(&cpuidle_lock);
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dev = per_cpu(cpuidle_devices, cpu);
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dev = per_cpu(cpuidle_devices, cpu);
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if (!dev || !dev->coupled)
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if (dev && dev->coupled) {
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goto out;
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switch (action & ~CPU_TASKS_FROZEN) {
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case CPU_UP_PREPARE:
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case CPU_DOWN_PREPARE:
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cpuidle_coupled_prevent_idle(dev->coupled);
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break;
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case CPU_ONLINE:
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case CPU_DEAD:
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cpuidle_coupled_update_online_cpus(dev->coupled);
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cpuidle_coupled_update_online_cpus(dev->coupled);
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/* Fall through */
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case CPU_UP_CANCELED:
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case CPU_DOWN_FAILED:
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cpuidle_coupled_allow_idle(dev->coupled);
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cpuidle_coupled_allow_idle(dev->coupled);
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break;
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}
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}
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out:
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mutex_unlock(&cpuidle_lock);
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mutex_unlock(&cpuidle_lock);
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return NOTIFY_OK;
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return 0;
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}
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}
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static struct notifier_block cpuidle_coupled_cpu_notifier = {
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static int coupled_cpu_up_prepare(unsigned int cpu)
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.notifier_call = cpuidle_coupled_cpu_notify,
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{
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};
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struct cpuidle_device *dev;
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mutex_lock(&cpuidle_lock);
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dev = per_cpu(cpuidle_devices, cpu);
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if (dev && dev->coupled)
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cpuidle_coupled_prevent_idle(dev->coupled);
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mutex_unlock(&cpuidle_lock);
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return 0;
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}
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static int __init cpuidle_coupled_init(void)
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static int __init cpuidle_coupled_init(void)
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{
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{
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return register_cpu_notifier(&cpuidle_coupled_cpu_notifier);
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int ret;
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ret = cpuhp_setup_state_nocalls(CPUHP_CPUIDLE_COUPLED_PREPARE,
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"cpuidle/coupled:prepare",
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coupled_cpu_up_prepare,
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coupled_cpu_online);
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if (ret)
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return ret;
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ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
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"cpuidle/coupled:online",
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coupled_cpu_online,
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coupled_cpu_up_prepare);
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if (ret < 0)
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cpuhp_remove_state_nocalls(CPUHP_CPUIDLE_COUPLED_PREPARE);
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return ret;
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}
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}
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core_initcall(cpuidle_coupled_init);
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core_initcall(cpuidle_coupled_init);
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@ -30,6 +30,7 @@ enum cpuhp_state {
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CPUHP_SLAB_PREPARE,
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CPUHP_SLAB_PREPARE,
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CPUHP_MD_RAID5_PREPARE,
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CPUHP_MD_RAID5_PREPARE,
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CPUHP_RCUTREE_PREP,
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CPUHP_RCUTREE_PREP,
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CPUHP_CPUIDLE_COUPLED_PREPARE,
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CPUHP_NOTIFY_PREPARE,
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CPUHP_NOTIFY_PREPARE,
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CPUHP_TIMERS_DEAD,
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CPUHP_TIMERS_DEAD,
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CPUHP_BRINGUP_CPU,
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CPUHP_BRINGUP_CPU,
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