206 lines
5.3 KiB
C
206 lines
5.3 KiB
C
/*
|
|
* cpuidle.h - a generic framework for CPU idle power management
|
|
*
|
|
* (C) 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.
|
|
*/
|
|
|
|
#ifndef _LINUX_CPUIDLE_H
|
|
#define _LINUX_CPUIDLE_H
|
|
|
|
#include <linux/percpu.h>
|
|
#include <linux/list.h>
|
|
#include <linux/kobject.h>
|
|
#include <linux/completion.h>
|
|
|
|
#define CPUIDLE_STATE_MAX 8
|
|
#define CPUIDLE_NAME_LEN 16
|
|
#define CPUIDLE_DESC_LEN 32
|
|
|
|
struct module;
|
|
|
|
struct cpuidle_device;
|
|
struct cpuidle_driver;
|
|
|
|
|
|
/****************************
|
|
* CPUIDLE DEVICE INTERFACE *
|
|
****************************/
|
|
|
|
struct cpuidle_state_usage {
|
|
void *driver_data;
|
|
|
|
unsigned long long usage;
|
|
unsigned long long time; /* in US */
|
|
};
|
|
|
|
struct cpuidle_state {
|
|
char name[CPUIDLE_NAME_LEN];
|
|
char desc[CPUIDLE_DESC_LEN];
|
|
|
|
unsigned int flags;
|
|
unsigned int exit_latency; /* in US */
|
|
unsigned int power_usage; /* in mW */
|
|
unsigned int target_residency; /* in US */
|
|
|
|
int (*enter) (struct cpuidle_device *dev,
|
|
struct cpuidle_driver *drv,
|
|
int index);
|
|
};
|
|
|
|
/* Idle State Flags */
|
|
#define CPUIDLE_FLAG_TIME_VALID (0x01) /* is residency time measurable? */
|
|
|
|
#define CPUIDLE_DRIVER_FLAGS_MASK (0xFFFF0000)
|
|
|
|
/**
|
|
* cpuidle_get_statedata - retrieves private driver state data
|
|
* @st_usage: the state usage statistics
|
|
*/
|
|
static inline void *cpuidle_get_statedata(struct cpuidle_state_usage *st_usage)
|
|
{
|
|
return st_usage->driver_data;
|
|
}
|
|
|
|
/**
|
|
* cpuidle_set_statedata - stores private driver state data
|
|
* @st_usage: the state usage statistics
|
|
* @data: the private data
|
|
*/
|
|
static inline void
|
|
cpuidle_set_statedata(struct cpuidle_state_usage *st_usage, void *data)
|
|
{
|
|
st_usage->driver_data = data;
|
|
}
|
|
|
|
struct cpuidle_state_kobj {
|
|
struct cpuidle_state *state;
|
|
struct cpuidle_state_usage *state_usage;
|
|
struct completion kobj_unregister;
|
|
struct kobject kobj;
|
|
};
|
|
|
|
struct cpuidle_device {
|
|
unsigned int registered:1;
|
|
unsigned int enabled:1;
|
|
unsigned int cpu;
|
|
|
|
int last_residency;
|
|
int state_count;
|
|
struct cpuidle_state_usage states_usage[CPUIDLE_STATE_MAX];
|
|
struct cpuidle_state_kobj *kobjs[CPUIDLE_STATE_MAX];
|
|
|
|
struct list_head device_list;
|
|
struct kobject kobj;
|
|
struct completion kobj_unregister;
|
|
void *governor_data;
|
|
};
|
|
|
|
DECLARE_PER_CPU(struct cpuidle_device *, cpuidle_devices);
|
|
|
|
/**
|
|
* cpuidle_get_last_residency - retrieves the last state's residency time
|
|
* @dev: the target CPU
|
|
*
|
|
* NOTE: this value is invalid if CPUIDLE_FLAG_TIME_VALID isn't set
|
|
*/
|
|
static inline int cpuidle_get_last_residency(struct cpuidle_device *dev)
|
|
{
|
|
return dev->last_residency;
|
|
}
|
|
|
|
|
|
/****************************
|
|
* CPUIDLE DRIVER INTERFACE *
|
|
****************************/
|
|
|
|
struct cpuidle_driver {
|
|
char name[CPUIDLE_NAME_LEN];
|
|
struct module *owner;
|
|
|
|
unsigned int power_specified:1;
|
|
struct cpuidle_state states[CPUIDLE_STATE_MAX];
|
|
int state_count;
|
|
int safe_state_index;
|
|
};
|
|
|
|
#ifdef CONFIG_CPU_IDLE
|
|
extern void disable_cpuidle(void);
|
|
extern int cpuidle_idle_call(void);
|
|
|
|
extern int cpuidle_register_driver(struct cpuidle_driver *drv);
|
|
struct cpuidle_driver *cpuidle_get_driver(void);
|
|
extern void cpuidle_unregister_driver(struct cpuidle_driver *drv);
|
|
extern int cpuidle_register_device(struct cpuidle_device *dev);
|
|
extern void cpuidle_unregister_device(struct cpuidle_device *dev);
|
|
|
|
extern void cpuidle_pause_and_lock(void);
|
|
extern void cpuidle_resume_and_unlock(void);
|
|
extern int cpuidle_enable_device(struct cpuidle_device *dev);
|
|
extern void cpuidle_disable_device(struct cpuidle_device *dev);
|
|
|
|
#else
|
|
static inline void disable_cpuidle(void) { }
|
|
static inline int cpuidle_idle_call(void) { return -ENODEV; }
|
|
|
|
static inline int cpuidle_register_driver(struct cpuidle_driver *drv)
|
|
{return -ENODEV; }
|
|
static inline struct cpuidle_driver *cpuidle_get_driver(void) {return NULL; }
|
|
static inline void cpuidle_unregister_driver(struct cpuidle_driver *drv) { }
|
|
static inline int cpuidle_register_device(struct cpuidle_device *dev)
|
|
{return -ENODEV; }
|
|
static inline void cpuidle_unregister_device(struct cpuidle_device *dev) { }
|
|
|
|
static inline void cpuidle_pause_and_lock(void) { }
|
|
static inline void cpuidle_resume_and_unlock(void) { }
|
|
static inline int cpuidle_enable_device(struct cpuidle_device *dev)
|
|
{return -ENODEV; }
|
|
static inline void cpuidle_disable_device(struct cpuidle_device *dev) { }
|
|
|
|
#endif
|
|
|
|
/******************************
|
|
* CPUIDLE GOVERNOR INTERFACE *
|
|
******************************/
|
|
|
|
struct cpuidle_governor {
|
|
char name[CPUIDLE_NAME_LEN];
|
|
struct list_head governor_list;
|
|
unsigned int rating;
|
|
|
|
int (*enable) (struct cpuidle_driver *drv,
|
|
struct cpuidle_device *dev);
|
|
void (*disable) (struct cpuidle_driver *drv,
|
|
struct cpuidle_device *dev);
|
|
|
|
int (*select) (struct cpuidle_driver *drv,
|
|
struct cpuidle_device *dev);
|
|
void (*reflect) (struct cpuidle_device *dev, int index);
|
|
|
|
struct module *owner;
|
|
};
|
|
|
|
#ifdef CONFIG_CPU_IDLE
|
|
|
|
extern int cpuidle_register_governor(struct cpuidle_governor *gov);
|
|
extern void cpuidle_unregister_governor(struct cpuidle_governor *gov);
|
|
|
|
#else
|
|
|
|
static inline int cpuidle_register_governor(struct cpuidle_governor *gov)
|
|
{return 0;}
|
|
static inline void cpuidle_unregister_governor(struct cpuidle_governor *gov) { }
|
|
|
|
#endif
|
|
|
|
#ifdef CONFIG_ARCH_HAS_CPU_RELAX
|
|
#define CPUIDLE_DRIVER_STATE_START 1
|
|
#else
|
|
#define CPUIDLE_DRIVER_STATE_START 0
|
|
#endif
|
|
|
|
#endif /* _LINUX_CPUIDLE_H */
|