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authorDaniel Lezcano <daniel.lezcano@linaro.org>2013-03-27 10:22:10 +0000
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-04-01 01:10:28 +0200
commita06df062a189a8d5588babb8bf0bb78672497798 (patch)
tree356822486d2a63b2dae44fab5421578eef37b1f2 /drivers/cpuidle/driver.c
parent4dbad816febb6cb7340e36af4f5c0dc86e55a2ca (diff)
downloadop-kernel-dev-a06df062a189a8d5588babb8bf0bb78672497798.zip
op-kernel-dev-a06df062a189a8d5588babb8bf0bb78672497798.tar.gz
cpuidle: initialize the broadcast timer framework
The commit 89878baa73f0f1c679355006bd8632e5d78f96c2 introduced the CPUIDLE_FLAG_TIMER_STOP flag where we specify a specific idle state stops the local timer. Now use this flag to check at init time if one state will need the broadcast timer and, in this case, setup the broadcast timer framework. That prevents multiple code duplication in the drivers. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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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