189 lines
4.9 KiB
C
189 lines
4.9 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/module.h>
|
|
#include <linux/kobject.h>
|
|
#include <linux/completion.h>
|
|
|
|
#define CPUIDLE_STATE_MAX 8
|
|
#define CPUIDLE_NAME_LEN 16
|
|
|
|
struct cpuidle_device;
|
|
|
|
|
|
/****************************
|
|
* CPUIDLE DEVICE INTERFACE *
|
|
****************************/
|
|
|
|
struct cpuidle_state {
|
|
char name[CPUIDLE_NAME_LEN];
|
|
void *driver_data;
|
|
|
|
unsigned int flags;
|
|
unsigned int exit_latency; /* in US */
|
|
unsigned int power_usage; /* in mW */
|
|
unsigned int target_residency; /* in US */
|
|
|
|
unsigned int usage;
|
|
unsigned int time; /* in US */
|
|
|
|
int (*enter) (struct cpuidle_device *dev,
|
|
struct cpuidle_state *state);
|
|
};
|
|
|
|
/* Idle State Flags */
|
|
#define CPUIDLE_FLAG_TIME_VALID (0x01) /* is residency time measurable? */
|
|
#define CPUIDLE_FLAG_CHECK_BM (0x02) /* BM activity will exit state */
|
|
#define CPUIDLE_FLAG_POLL (0x10) /* no latency, no savings */
|
|
#define CPUIDLE_FLAG_SHALLOW (0x20) /* low latency, minimal savings */
|
|
#define CPUIDLE_FLAG_BALANCED (0x40) /* medium latency, moderate savings */
|
|
#define CPUIDLE_FLAG_DEEP (0x80) /* high latency, large savings */
|
|
|
|
#define CPUIDLE_DRIVER_FLAGS_MASK (0xFFFF0000)
|
|
|
|
/**
|
|
* cpuidle_get_statedata - retrieves private driver state data
|
|
* @state: the state
|
|
*/
|
|
static inline void * cpuidle_get_statedata(struct cpuidle_state *state)
|
|
{
|
|
return state->driver_data;
|
|
}
|
|
|
|
/**
|
|
* cpuidle_set_statedata - stores private driver state data
|
|
* @state: the state
|
|
* @data: the private data
|
|
*/
|
|
static inline void
|
|
cpuidle_set_statedata(struct cpuidle_state *state, void *data)
|
|
{
|
|
state->driver_data = data;
|
|
}
|
|
|
|
struct cpuidle_state_kobj {
|
|
struct cpuidle_state *state;
|
|
struct completion kobj_unregister;
|
|
struct kobject kobj;
|
|
};
|
|
|
|
struct cpuidle_device {
|
|
unsigned int enabled:1;
|
|
unsigned int cpu;
|
|
|
|
int last_residency;
|
|
int state_count;
|
|
struct cpuidle_state states[CPUIDLE_STATE_MAX];
|
|
struct cpuidle_state_kobj *kobjs[CPUIDLE_STATE_MAX];
|
|
struct cpuidle_state *last_state;
|
|
|
|
struct list_head device_list;
|
|
struct kobject kobj;
|
|
struct completion kobj_unregister;
|
|
void *governor_data;
|
|
struct cpuidle_state *safe_state;
|
|
};
|
|
|
|
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;
|
|
};
|
|
|
|
#ifdef CONFIG_CPU_IDLE
|
|
|
|
extern int cpuidle_register_driver(struct cpuidle_driver *drv);
|
|
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 int cpuidle_register_driver(struct cpuidle_driver *drv)
|
|
{return 0;}
|
|
static inline void cpuidle_unregister_driver(struct cpuidle_driver *drv) { }
|
|
static inline int cpuidle_register_device(struct cpuidle_device *dev)
|
|
{return 0;}
|
|
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 0;}
|
|
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_device *dev);
|
|
void (*disable) (struct cpuidle_device *dev);
|
|
|
|
int (*select) (struct cpuidle_device *dev);
|
|
void (*reflect) (struct cpuidle_device *dev);
|
|
|
|
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 */
|