/* * cpuidle.h - a generic framework for CPU idle power management * * (C) 2007 Venkatesh Pallipadi * Shaohua Li * Adam Belay * * This code is licenced under the GPL. */ #ifndef _LINUX_CPUIDLE_H #define _LINUX_CPUIDLE_H #include #include #include #include #include #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 disable; 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 */ int power_usage; /* in mW */ unsigned int target_residency; /* in US */ int (*enter) (struct cpuidle_device *dev, struct cpuidle_driver *drv, int index); int (*enter_dead) (struct cpuidle_device *dev, 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; }; 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 { const char *name; struct module *owner; unsigned int power_specified:1; /* set to 1 to use the core cpuidle time keeping (for all states). */ unsigned int en_core_tk_irqen: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); extern struct cpuidle_driver *cpuidle_get_driver(void); extern struct cpuidle_driver *cpuidle_driver_ref(void); extern void cpuidle_driver_unref(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); extern int cpuidle_wrap_enter(struct cpuidle_device *dev, struct cpuidle_driver *drv, int index, int (*enter)(struct cpuidle_device *dev, struct cpuidle_driver *drv, int index)); extern int cpuidle_play_dead(void); #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 struct cpuidle_driver *cpuidle_driver_ref(void) {return NULL; } static inline void cpuidle_driver_unref(void) {} 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) { } static inline int cpuidle_wrap_enter(struct cpuidle_device *dev, struct cpuidle_driver *drv, int index, int (*enter)(struct cpuidle_device *dev, struct cpuidle_driver *drv, int index)) { return -ENODEV; } static inline int cpuidle_play_dead(void) {return -ENODEV; } #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); #ifdef CONFIG_INTEL_IDLE extern int intel_idle_cpu_init(int cpu); #else static inline int intel_idle_cpu_init(int cpu) { return -1; } #endif #else static inline int intel_idle_cpu_init(int cpu) { return -1; } 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 */