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274 lines
8.5 KiB
274 lines
8.5 KiB
/* |
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* cpuidle.h - a generic framework for CPU idle power management |
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* |
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* (C) 2007 Venkatesh Pallipadi <[email protected]> |
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* Shaohua Li <[email protected]> |
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* Adam Belay <[email protected]> |
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* |
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* This code is licenced under the GPL. |
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*/ |
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#ifndef _LINUX_CPUIDLE_H |
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#define _LINUX_CPUIDLE_H |
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#include <linux/percpu.h> |
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#include <linux/list.h> |
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#include <linux/hrtimer.h> |
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#define CPUIDLE_STATE_MAX 10 |
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#define CPUIDLE_NAME_LEN 16 |
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#define CPUIDLE_DESC_LEN 32 |
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struct module; |
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struct cpuidle_device; |
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struct cpuidle_driver; |
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/**************************** |
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* CPUIDLE DEVICE INTERFACE * |
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****************************/ |
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struct cpuidle_state_usage { |
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unsigned long long disable; |
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unsigned long long usage; |
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unsigned long long time; /* in US */ |
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}; |
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struct cpuidle_state { |
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char name[CPUIDLE_NAME_LEN]; |
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char desc[CPUIDLE_DESC_LEN]; |
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unsigned int flags; |
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unsigned int exit_latency; /* in US */ |
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int power_usage; /* in mW */ |
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unsigned int target_residency; /* in US */ |
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bool disabled; /* disabled on all CPUs */ |
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int (*enter) (struct cpuidle_device *dev, |
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struct cpuidle_driver *drv, |
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int index); |
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int (*enter_dead) (struct cpuidle_device *dev, int index); |
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/* |
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* CPUs execute ->enter_freeze with the local tick or entire timekeeping |
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* suspended, so it must not re-enable interrupts at any point (even |
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* temporarily) or attempt to change states of clock event devices. |
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*/ |
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void (*enter_freeze) (struct cpuidle_device *dev, |
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struct cpuidle_driver *drv, |
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int index); |
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} __do_const; |
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typedef struct cpuidle_state __no_const cpuidle_state_no_const; |
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/* Idle State Flags */ |
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#define CPUIDLE_FLAG_COUPLED (0x02) /* state applies to multiple cpus */ |
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#define CPUIDLE_FLAG_TIMER_STOP (0x04) /* timer is stopped on this state */ |
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#define CPUIDLE_DRIVER_FLAGS_MASK (0xFFFF0000) |
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struct cpuidle_device_kobj; |
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struct cpuidle_state_kobj; |
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struct cpuidle_driver_kobj; |
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struct cpuidle_device { |
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unsigned int registered:1; |
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unsigned int enabled:1; |
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unsigned int cpu; |
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int last_residency; |
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struct cpuidle_state_usage states_usage[CPUIDLE_STATE_MAX]; |
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struct cpuidle_state_kobj *kobjs[CPUIDLE_STATE_MAX]; |
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struct cpuidle_driver_kobj *kobj_driver; |
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struct cpuidle_device_kobj *kobj_dev; |
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struct list_head device_list; |
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#ifdef CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED |
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cpumask_t coupled_cpus; |
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struct cpuidle_coupled *coupled; |
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#endif |
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}; |
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DECLARE_PER_CPU(struct cpuidle_device *, cpuidle_devices); |
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DECLARE_PER_CPU(struct cpuidle_device, cpuidle_dev); |
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/** |
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* cpuidle_get_last_residency - retrieves the last state's residency time |
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* @dev: the target CPU |
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*/ |
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static inline int cpuidle_get_last_residency(struct cpuidle_device *dev) |
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{ |
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return dev->last_residency; |
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} |
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/**************************** |
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* CPUIDLE DRIVER INTERFACE * |
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****************************/ |
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struct cpuidle_driver { |
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const char *name; |
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struct module *owner; |
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int refcnt; |
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/* used by the cpuidle framework to setup the broadcast timer */ |
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unsigned int bctimer:1; |
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/* states array must be ordered in decreasing power consumption */ |
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struct cpuidle_state states[CPUIDLE_STATE_MAX]; |
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int state_count; |
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int safe_state_index; |
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/* the driver handles the cpus in cpumask */ |
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struct cpumask *cpumask; |
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}; |
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#ifdef CONFIG_CPU_IDLE |
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extern void disable_cpuidle(void); |
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extern bool cpuidle_not_available(struct cpuidle_driver *drv, |
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struct cpuidle_device *dev); |
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extern int cpuidle_select(struct cpuidle_driver *drv, |
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struct cpuidle_device *dev); |
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extern int cpuidle_enter(struct cpuidle_driver *drv, |
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struct cpuidle_device *dev, int index); |
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extern void cpuidle_reflect(struct cpuidle_device *dev, int index); |
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extern int cpuidle_register_driver(struct cpuidle_driver *drv); |
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extern struct cpuidle_driver *cpuidle_get_driver(void); |
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extern struct cpuidle_driver *cpuidle_driver_ref(void); |
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extern void cpuidle_driver_unref(void); |
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extern void cpuidle_unregister_driver(struct cpuidle_driver *drv); |
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extern int cpuidle_register_device(struct cpuidle_device *dev); |
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extern void cpuidle_unregister_device(struct cpuidle_device *dev); |
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extern int cpuidle_register(struct cpuidle_driver *drv, |
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const struct cpumask *const coupled_cpus); |
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extern void cpuidle_unregister(struct cpuidle_driver *drv); |
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extern void cpuidle_pause_and_lock(void); |
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extern void cpuidle_resume_and_unlock(void); |
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extern void cpuidle_pause(void); |
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extern void cpuidle_resume(void); |
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extern int cpuidle_enable_device(struct cpuidle_device *dev); |
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extern void cpuidle_disable_device(struct cpuidle_device *dev); |
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extern int cpuidle_play_dead(void); |
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extern struct cpuidle_driver *cpuidle_get_cpu_driver(struct cpuidle_device *dev); |
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static inline struct cpuidle_device *cpuidle_get_device(void) |
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{return __this_cpu_read(cpuidle_devices); } |
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#else |
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static inline void disable_cpuidle(void) { } |
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static inline bool cpuidle_not_available(struct cpuidle_driver *drv, |
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struct cpuidle_device *dev) |
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{return true; } |
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static inline int cpuidle_select(struct cpuidle_driver *drv, |
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struct cpuidle_device *dev) |
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{return -ENODEV; } |
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static inline int cpuidle_enter(struct cpuidle_driver *drv, |
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struct cpuidle_device *dev, int index) |
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{return -ENODEV; } |
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static inline void cpuidle_reflect(struct cpuidle_device *dev, int index) { } |
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static inline int cpuidle_register_driver(struct cpuidle_driver *drv) |
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{return -ENODEV; } |
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static inline struct cpuidle_driver *cpuidle_get_driver(void) {return NULL; } |
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static inline struct cpuidle_driver *cpuidle_driver_ref(void) {return NULL; } |
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static inline void cpuidle_driver_unref(void) {} |
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static inline void cpuidle_unregister_driver(struct cpuidle_driver *drv) { } |
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static inline int cpuidle_register_device(struct cpuidle_device *dev) |
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{return -ENODEV; } |
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static inline void cpuidle_unregister_device(struct cpuidle_device *dev) { } |
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static inline int cpuidle_register(struct cpuidle_driver *drv, |
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const struct cpumask *const coupled_cpus) |
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{return -ENODEV; } |
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static inline void cpuidle_unregister(struct cpuidle_driver *drv) { } |
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static inline void cpuidle_pause_and_lock(void) { } |
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static inline void cpuidle_resume_and_unlock(void) { } |
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static inline void cpuidle_pause(void) { } |
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static inline void cpuidle_resume(void) { } |
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static inline int cpuidle_enable_device(struct cpuidle_device *dev) |
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{return -ENODEV; } |
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static inline void cpuidle_disable_device(struct cpuidle_device *dev) { } |
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static inline int cpuidle_play_dead(void) {return -ENODEV; } |
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static inline struct cpuidle_driver *cpuidle_get_cpu_driver( |
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struct cpuidle_device *dev) {return NULL; } |
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static inline struct cpuidle_device *cpuidle_get_device(void) {return NULL; } |
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#endif |
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#if defined(CONFIG_CPU_IDLE) && defined(CONFIG_SUSPEND) |
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extern int cpuidle_find_deepest_state(struct cpuidle_driver *drv, |
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struct cpuidle_device *dev); |
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extern int cpuidle_enter_freeze(struct cpuidle_driver *drv, |
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struct cpuidle_device *dev); |
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#else |
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static inline int cpuidle_find_deepest_state(struct cpuidle_driver *drv, |
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struct cpuidle_device *dev) |
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{return -ENODEV; } |
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static inline int cpuidle_enter_freeze(struct cpuidle_driver *drv, |
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struct cpuidle_device *dev) |
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{return -ENODEV; } |
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#endif |
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/* kernel/sched/idle.c */ |
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extern void sched_idle_set_state(struct cpuidle_state *idle_state); |
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extern void default_idle_call(void); |
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#ifdef CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED |
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void cpuidle_coupled_parallel_barrier(struct cpuidle_device *dev, atomic_t *a); |
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#else |
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static inline void cpuidle_coupled_parallel_barrier(struct cpuidle_device *dev, atomic_t *a) |
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{ |
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} |
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#endif |
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/****************************** |
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* CPUIDLE GOVERNOR INTERFACE * |
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******************************/ |
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struct cpuidle_governor { |
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char name[CPUIDLE_NAME_LEN]; |
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struct list_head governor_list; |
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unsigned int rating; |
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int (*enable) (struct cpuidle_driver *drv, |
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struct cpuidle_device *dev); |
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void (*disable) (struct cpuidle_driver *drv, |
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struct cpuidle_device *dev); |
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int (*select) (struct cpuidle_driver *drv, |
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struct cpuidle_device *dev); |
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void (*reflect) (struct cpuidle_device *dev, int index); |
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struct module *owner; |
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} __do_const; |
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#ifdef CONFIG_CPU_IDLE |
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extern int cpuidle_register_governor(struct cpuidle_governor *gov); |
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#else |
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static inline int cpuidle_register_governor(struct cpuidle_governor *gov) |
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{return 0;} |
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#endif |
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#ifdef CONFIG_ARCH_HAS_CPU_RELAX |
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#define CPUIDLE_DRIVER_STATE_START 1 |
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#else |
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#define CPUIDLE_DRIVER_STATE_START 0 |
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#endif |
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#define CPU_PM_CPU_IDLE_ENTER(low_level_idle_enter, idx) \ |
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({ \ |
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int __ret; \ |
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\ |
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if (!idx) { \ |
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cpu_do_idle(); \ |
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return idx; \ |
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} \ |
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\ |
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__ret = cpu_pm_enter(); \ |
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if (!__ret) { \ |
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__ret = low_level_idle_enter(idx); \ |
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cpu_pm_exit(); \ |
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} \ |
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\ |
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__ret ? -1 : idx; \ |
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}) |
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#endif /* _LINUX_CPUIDLE_H */
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