@@ -11,12 +11,14 @@
#define pr_fmt(fmt) "CPUidle arm: " fmt
+#include <linux/cpu.h>
#include <linux/cpuidle.h>
#include <linux/cpumask.h>
#include <linux/cpu_pm.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
+#include <linux/pm_runtime.h>
#include <linux/slab.h>
#include <asm/cpuidle.h>
@@ -37,6 +39,7 @@ static int arm_enter_idle_state(struct cpuidle_device *dev,
struct cpuidle_driver *drv, int idx)
{
int ret;
+ struct device *cpu_dev = get_cpu_device(dev->cpu);
if (!idx) {
cpu_do_idle();
@@ -45,6 +48,8 @@ static int arm_enter_idle_state(struct cpuidle_device *dev,
ret = cpu_pm_enter();
if (!ret) {
+ RCU_NONIDLE(pm_runtime_put_sync_suspend(cpu_dev));
+
/*
* Pass idle state index to cpu_suspend which in turn will
* call the CPU ops suspend protocol with idle index as a
@@ -52,6 +57,7 @@ static int arm_enter_idle_state(struct cpuidle_device *dev,
*/
arm_cpuidle_suspend(idx);
+ RCU_NONIDLE(pm_runtime_get_sync(cpu_dev));
cpu_pm_exit();
}
@@ -84,6 +90,30 @@ static const struct of_device_id arm_idle_state_match[] __initconst = {
{ },
};
+#ifdef CONFIG_HOTPLUG_CPU
+static int cpu_hotplug(struct notifier_block *nb,
+ unsigned long action, void *data)
+{
+ struct device *cpu_dev = get_cpu_device(smp_processor_id());
+
+ /* Execute CPU runtime PM on that CPU */
+ switch (action) {
+ case CPU_DYING:
+ case CPU_DYING_FROZEN:
+ RCU_NONIDLE(pm_runtime_put_sync_suspend(cpu_dev));
+ break;
+ case CPU_STARTING:
+ case CPU_STARTING_FROZEN:
+ RCU_NONIDLE(pm_runtime_get_sync(cpu_dev));
+ break;
+ default:
+ break;
+ }
+
+ return NOTIFY_OK;
+}
+#endif
+
/*
* arm_idle_init
*
@@ -96,6 +126,7 @@ static int __init arm_idle_init(void)
int cpu, ret;
struct cpuidle_driver *drv = &arm_idle_driver;
struct cpuidle_device *dev;
+ struct device *cpu_dev;
/*
* Initialize idle states data, starting at index 1.
@@ -118,6 +149,16 @@ static int __init arm_idle_init(void)
* idle states suspend back-end specific data
*/
for_each_possible_cpu(cpu) {
+
+ /* Initialize Runtime PM for the CPU */
+ cpu_dev = get_cpu_device(cpu);
+ pm_runtime_irq_safe(cpu_dev);
+ pm_runtime_enable(cpu_dev);
+ if (cpu_online(cpu)) {
+ pm_runtime_get_noresume(cpu_dev);
+ pm_runtime_set_active(cpu_dev);
+ }
+
ret = arm_cpuidle_init(cpu);
/*
@@ -148,10 +189,17 @@ static int __init arm_idle_init(void)
}
}
+#ifdef CONFIG_HOTPLUG_CPU
+ /* Register for hotplug notifications for runtime PM */
+ hotcpu_notifier(cpu_hotplug, 0);
+#endif
+
return 0;
out_fail:
while (--cpu >= 0) {
dev = per_cpu(cpuidle_devices, cpu);
+ cpu_dev = get_cpu_device(cpu);
+ __pm_runtime_disable(cpu_dev, false);
cpuidle_unregister_device(dev);
kfree(dev);
}
Notify runtime PM when the CPU is going to be powered off in the idle state. This allows for runtime PM suspend/resume of the CPU as well as its PM domain. We do not call into runtime PM for ARM WFI to keep the default state simple and faster. Cc: Daniel Lezcano <daniel.lezcano@linaro.org> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Lina Iyer <lina.iyer@linaro.org> --- Changes since RFC v1 - - runtime PM initialization is now done as part of this file - hotplug and its runtime PM invocation is done here drivers/cpuidle/cpuidle-arm.c | 48 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html