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path: root/drivers/cpuidle/driver.c
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Diffstat (limited to 'drivers/cpuidle/driver.c')
-rw-r--r--drivers/cpuidle/driver.c31
1 files changed, 29 insertions, 2 deletions
diff --git a/drivers/cpuidle/driver.c b/drivers/cpuidle/driver.c
index 422c7b6..8dfaaae 100644
--- a/drivers/cpuidle/driver.c
+++ b/drivers/cpuidle/driver.c
@@ -11,6 +11,8 @@
#include <linux/mutex.h>
#include <linux/module.h>
#include <linux/cpuidle.h>
+#include <linux/cpumask.h>
+#include <linux/clockchips.h>
#include "cpuidle.h"
@@ -19,9 +21,28 @@ DEFINE_SPINLOCK(cpuidle_driver_lock);
static void __cpuidle_set_cpu_driver(struct cpuidle_driver *drv, int cpu);
static struct cpuidle_driver * __cpuidle_get_cpu_driver(int cpu);
-static void __cpuidle_driver_init(struct cpuidle_driver *drv)
+static void cpuidle_setup_broadcast_timer(void *arg)
{
+ int cpu = smp_processor_id();
+ clockevents_notify((long)(arg), &cpu);
+}
+
+static void __cpuidle_driver_init(struct cpuidle_driver *drv, int cpu)
+{
+ int i;
+
drv->refcnt = 0;
+
+ for (i = drv->state_count - 1; i >= 0 ; i--) {
+
+ if (!(drv->states[i].flags & CPUIDLE_FLAG_TIMER_STOP))
+ continue;
+
+ drv->bctimer = 1;
+ on_each_cpu_mask(get_cpu_mask(cpu), cpuidle_setup_broadcast_timer,
+ (void *)CLOCK_EVT_NOTIFY_BROADCAST_ON, 1);
+ break;
+ }
}
static int __cpuidle_register_driver(struct cpuidle_driver *drv, int cpu)
@@ -35,7 +56,7 @@ static int __cpuidle_register_driver(struct cpuidle_driver *drv, int cpu)
if (__cpuidle_get_cpu_driver(cpu))
return -EBUSY;
- __cpuidle_driver_init(drv);
+ __cpuidle_driver_init(drv, cpu);
__cpuidle_set_cpu_driver(drv, cpu);
@@ -49,6 +70,12 @@ static void __cpuidle_unregister_driver(struct cpuidle_driver *drv, int cpu)
if (!WARN_ON(drv->refcnt > 0))
__cpuidle_set_cpu_driver(NULL, cpu);
+
+ if (drv->bctimer) {
+ drv->bctimer = 0;
+ on_each_cpu_mask(get_cpu_mask(cpu), cpuidle_setup_broadcast_timer,
+ (void *)CLOCK_EVT_NOTIFY_BROADCAST_OFF, 1);
+ }
}
#ifdef CONFIG_CPU_IDLE_MULTIPLE_DRIVERS
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