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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>
This commit is contained in:
Sebastian Andrzej Siewior 2016-08-24 11:14:44 +02:00 committed by Thomas Gleixner
parent 10fcca9d87
commit dfc616d8b3
2 changed files with 32 additions and 44 deletions
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75
drivers/cpuidle/coupled.c
View File

@ -749,65 +749,52 @@ static void cpuidle_coupled_allow_idle(struct cpuidle_coupled *coupled)
put_cpu();
}
/**
* cpuidle_coupled_cpu_notify - notifier called during hotplug transitions
* @nb: notifier block
* @action: hotplug transition
* @hcpu: target cpu number
*
* Called when a cpu is brought on or offline using hotplug. Updates the
* coupled cpu set appropriately
*/
static int cpuidle_coupled_cpu_notify(struct notifier_block *nb,
unsigned long action, void *hcpu)
static int coupled_cpu_online(unsigned int cpu)
{
int cpu = (unsigned long)hcpu;
struct cpuidle_device *dev;
switch (action & ~CPU_TASKS_FROZEN) {
case CPU_UP_PREPARE:
case CPU_DOWN_PREPARE:
case CPU_ONLINE:
case CPU_DEAD:
case CPU_UP_CANCELED:
case CPU_DOWN_FAILED:
break;
default:
return NOTIFY_OK;
}
mutex_lock(&cpuidle_lock);
dev = per_cpu(cpuidle_devices, cpu);
if (!dev || !dev->coupled)
goto out;
switch (action & ~CPU_TASKS_FROZEN) {
case CPU_UP_PREPARE:
case CPU_DOWN_PREPARE:
cpuidle_coupled_prevent_idle(dev->coupled);
break;
case CPU_ONLINE:
case CPU_DEAD:
if (dev && dev->coupled) {
cpuidle_coupled_update_online_cpus(dev->coupled);
/* Fall through */
case CPU_UP_CANCELED:
case CPU_DOWN_FAILED:
cpuidle_coupled_allow_idle(dev->coupled);
break;
}
out:
mutex_unlock(&cpuidle_lock);
return NOTIFY_OK;
return 0;
}
static struct notifier_block cpuidle_coupled_cpu_notifier = {
.notifier_call = cpuidle_coupled_cpu_notify,
};
static int coupled_cpu_up_prepare(unsigned int cpu)
{
struct cpuidle_device *dev;
mutex_lock(&cpuidle_lock);
dev = per_cpu(cpuidle_devices, cpu);
if (dev && dev->coupled)
cpuidle_coupled_prevent_idle(dev->coupled);
mutex_unlock(&cpuidle_lock);
return 0;
}
static int __init cpuidle_coupled_init(void)
{
return register_cpu_notifier(&cpuidle_coupled_cpu_notifier);
int ret;
ret = cpuhp_setup_state_nocalls(CPUHP_CPUIDLE_COUPLED_PREPARE,
"cpuidle/coupled:prepare",
coupled_cpu_up_prepare,
coupled_cpu_online);
if (ret)
return ret;
ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN,
"cpuidle/coupled:online",
coupled_cpu_online,
coupled_cpu_up_prepare);
if (ret < 0)
cpuhp_remove_state_nocalls(CPUHP_CPUIDLE_COUPLED_PREPARE);
return ret;
}
core_initcall(cpuidle_coupled_init);

1
include/linux/cpuhotplug.h
View File

@ -30,6 +30,7 @@ enum cpuhp_state {
CPUHP_SLAB_PREPARE,
CPUHP_MD_RAID5_PREPARE,
CPUHP_RCUTREE_PREP,
CPUHP_CPUIDLE_COUPLED_PREPARE,
CPUHP_NOTIFY_PREPARE,
CPUHP_TIMERS_DEAD,
CPUHP_BRINGUP_CPU,