linux-imx

/*

 * 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/sched.h>

#include <linux/sched/idle.h>

#include <linux/cpuidle.h>

#include <linux/cpumask.h>

#include <linux/tick.h>

#include <linux/cpu.h>

​

#include "cpuidle.h"

​

DEFINE_SPINLOCK(cpuidle_driver_lock);

​

#ifdef CONFIG_CPU_IDLE_MULTIPLE_DRIVERS

​

static DEFINE_PER_CPU(struct cpuidle_driver *, cpuidle_drivers);

​

/**

 * __cpuidle_get_cpu_driver - return the cpuidle driver tied to a CPU.

 * @cpu: the CPU handled by the driver

 *

 * Returns a pointer to struct cpuidle_driver or NULL if no driver has been

 * registered for @cpu.

 */

static struct cpuidle_driver *__cpuidle_get_cpu_driver(int cpu)

{

    return per_cpu(cpuidle_drivers, cpu);

}

​

/**

 * __cpuidle_unset_driver - unset per CPU driver variables.

 * @drv: a valid pointer to a struct cpuidle_driver

 *

 * For each CPU in the driver's CPU mask, unset the registered driver per CPU

 * variable. If @drv is different from the registered driver, the corresponding

 * variable is not cleared.

 */

static inline void __cpuidle_unset_driver(struct cpuidle_driver *drv)

{

    int cpu;

​

    for_each_cpu(cpu, drv->cpumask) {

​

        if (drv != __cpuidle_get_cpu_driver(cpu))

            continue;

​

        per_cpu(cpuidle_drivers, cpu) = NULL;

    }

}

​

/**

 * __cpuidle_set_driver - set per CPU driver variables for the given driver.

 * @drv: a valid pointer to a struct cpuidle_driver