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/*
* driver.c - driver support
*
* (C) 2006-2007 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
* Shaohua Li <shaohua.li@intel.com>
* Adam Belay <abelay@novell.com>
*
* This code is licenced under the GPL.
*/
#include <linux/mutex.h>
#include <linux/module.h>
#include <linux/cpuidle.h>
#include "cpuidle.h"
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)
{
drv->refcnt = 0;
}
static int __cpuidle_register_driver(struct cpuidle_driver *drv, int cpu)
{
if (!drv || !drv->state_count)
return -EINVAL;
if (cpuidle_disabled())
return -ENODEV;
if (__cpuidle_get_cpu_driver(cpu))
return -EBUSY;
__cpuidle_driver_init(drv);
__cpuidle_set_cpu_driver(drv, cpu);
return 0;
}
static void __cpuidle_unregister_driver(struct cpuidle_driver *drv, int cpu)
{
if (drv != __cpuidle_get_cpu_driver(cpu))
return;
if (!WARN_ON(drv->refcnt > 0))
__cpuidle_set_cpu_driver(NULL, cpu);
}
#ifdef CONFIG_CPU_IDLE_MULTIPLE_DRIVERS
static DEFINE_PER_CPU(struct cpuidle_driver *, cpuidle_drivers);
static void __cpuidle_set_cpu_driver(struct cpuidle_driver *drv, int cpu)
{
per_cpu(cpuidle_drivers, cpu) = drv;
}
static struct cpuidle_driver *__cpuidle_get_cpu_driver(int cpu)
{
return per_cpu(cpuidle_drivers, cpu);
}
static void __cpuidle_unregister_all_cpu_driver(struct cpuidle_driver *drv)
{
int cpu;
for_each_present_cpu(cpu)
__cpuidle_unregister_driver(drv, cpu);
}
static int __cpuidle_register_all_cpu_driver(struct cpuidle_driver *drv)
{
int ret = 0;
int i, cpu;
for_each_present_cpu(cpu) {
ret = __cpuidle_register_driver(drv, cpu);
if (ret)
break;
}
if (ret)
for_each_present_cpu(i) {
if (i == cpu)
break;
__cpuidle_unregister_driver(drv, i);
}
return ret;
}
int cpuidle_register_cpu_driver(struct cpuidle_driver *drv, int cpu)
{
int ret;
spin_lock(&cpuidle_driver_lock);
ret = __cpuidle_register_driver(drv, cpu);
spin_unlock(&cpuidle_driver_lock);
return ret;
}
void cpuidle_unregister_cpu_driver(struct cpuidle_driver *drv, int cpu)
{
spin_lock(&cpuidle_driver_lock);
__cpuidle_unregister_driver(drv, cpu);
spin_unlock(&cpuidle_driver_lock);
}
/**
* cpuidle_register_driver - registers a driver
* @drv: the driver
*/
int cpuidle_register_driver(struct cpuidle_driver *drv)
{
int ret;
spin_lock(&cpuidle_driver_lock);
ret = __cpuidle_register_all_cpu_driver(drv);
spin_unlock(&cpuidle_driver_lock);
return ret;
}
EXPORT_SYMBOL_GPL(cpuidle_register_driver);
/**
* cpuidle_unregister_driver - unregisters a driver
* @drv: the driver
*/
void cpuidle_unregister_driver(struct cpuidle_driver *drv)
{
spin_lock(&cpuidle_driver_lock);
__cpuidle_unregister_all_cpu_driver(drv);
spin_unlock(&cpuidle_driver_lock);
}
EXPORT_SYMBOL_GPL(cpuidle_unregister_driver);
#else
static struct cpuidle_driver *cpuidle_curr_driver;
static inline void __cpuidle_set_cpu_driver(struct cpuidle_driver *drv, int cpu)
{
cpuidle_curr_driver = drv;
}
static inline struct cpuidle_driver *__cpuidle_get_cpu_driver(int cpu)
{
return cpuidle_curr_driver;
}
/**
* cpuidle_register_driver - registers a driver
* @drv: the driver
*/
int cpuidle_register_driver(struct cpuidle_driver *drv)
{
int ret, cpu;
cpu = get_cpu();
spin_lock(&cpuidle_driver_lock);
ret = __cpuidle_register_driver(drv, cpu);
spin_unlock(&cpuidle_driver_lock);
put_cpu();
return ret;
}
EXPORT_SYMBOL_GPL(cpuidle_register_driver);
/**
* cpuidle_unregister_driver - unregisters a driver
* @drv: the driver
*/
void cpuidle_unregister_driver(struct cpuidle_driver *drv)
{
int cpu;
cpu = get_cpu();
spin_lock(&cpuidle_driver_lock);
__cpuidle_unregister_driver(drv, cpu);
spin_unlock(&cpuidle_driver_lock);
put_cpu();
}
EXPORT_SYMBOL_GPL(cpuidle_unregister_driver);
#endif
/**
* cpuidle_get_driver - return the current driver
*/
struct cpuidle_driver *cpuidle_get_driver(void)
{
struct cpuidle_driver *drv;
int cpu;
cpu = get_cpu();
drv = __cpuidle_get_cpu_driver(cpu);
put_cpu();
return drv;
}
EXPORT_SYMBOL_GPL(cpuidle_get_driver);
/**
* cpuidle_get_cpu_driver - return the driver tied with a cpu
*/
struct cpuidle_driver *cpuidle_get_cpu_driver(struct cpuidle_device *dev)
{
if (!dev)
return NULL;
return __cpuidle_get_cpu_driver(dev->cpu);
}
EXPORT_SYMBOL_GPL(cpuidle_get_cpu_driver);
struct cpuidle_driver *cpuidle_driver_ref(void)
{
struct cpuidle_driver *drv;
spin_lock(&cpuidle_driver_lock);
drv = cpuidle_get_driver();
drv->refcnt++;
spin_unlock(&cpuidle_driver_lock);
return drv;
}
void cpuidle_driver_unref(void)
{
struct cpuidle_driver *drv = cpuidle_get_driver();
spin_lock(&cpuidle_driver_lock);
if (drv && !WARN_ON(drv->refcnt <= 0))
drv->refcnt--;
spin_unlock(&cpuidle_driver_lock);
}
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