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/* * 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/hrtimer.h> #define CPUIDLE_STATE_MAX 10 #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 { unsigned long long disable; unsigned long long usage; unsigned long long time; / in US / unsigned long long above; / Number of times it's been too deep / unsigned long long below; / Number of times it's been too shallow / #ifdef CONFIG_SUSPEND unsigned long long s2idle_usage; unsigned long long s2idle_time; / in US / #endif }; 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 / bool disabled; / disabled on all CPUs / int (enter) (struct cpuidle_device dev, struct cpuidle_driver drv, int index); int (enter_dead) (struct cpuidle_device dev, int index); /* * CPUs execute ->enter_s2idle with the local tick or entire timekeeping * suspended, so it must not re-enable interrupts at any point (even * temporarily) or attempt to change states of clock event devices. / void (enter_s2idle) (struct cpuidle_device dev, struct cpuidle_driver drv, int index); }; /* Idle State Flags / #define CPUIDLE_FLAG_NONE (0x00) #define CPUIDLE_FLAG_POLLING BIT(0) / polling state / #define CPUIDLE_FLAG_COUPLED BIT(1) / state applies to multiple cpus / #define CPUIDLE_FLAG_TIMER_STOP BIT(2) / timer is stopped on this state / struct cpuidle_device_kobj; struct cpuidle_state_kobj; struct cpuidle_driver_kobj; struct cpuidle_device { unsigned int registered:1; unsigned int enabled:1; unsigned int use_deepest_state:1; unsigned int poll_time_limit:1; unsigned int cpu; ktime_t next_hrtimer; int last_state_idx; int last_residency; u64 poll_limit_ns; struct cpuidle_state_usage states_usage[CPUIDLE_STATE_MAX]; struct cpuidle_state_kobj kobjs[CPUIDLE_STATE_MAX]; struct cpuidle_driver_kobj kobj_driver; struct cpuidle_device_kobj kobj_dev; struct list_head device_list; #ifdef CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED cpumask_t coupled_cpus; struct cpuidle_coupled coupled; #endif }; DECLARE_PER_CPU(struct cpuidle_device , cpuidle_devices); DECLARE_PER_CPU(struct cpuidle_device, cpuidle_dev); /**************************** * CPUIDLE DRIVER INTERFACE * ***************************/ struct cpuidle_driver { const char name; struct module owner; int refcnt; / used by the cpuidle framework to setup the broadcast timer / unsigned int bctimer:1; / states array must be ordered in decreasing power consumption / struct cpuidle_state states[CPUIDLE_STATE_MAX]; int state_count; int safe_state_index; / the driver handles the cpus in cpumask / struct cpumask cpumask; /* preferred governor to switch at register time / const char governor; }; #ifdef CONFIG_CPU_IDLE extern void disable_cpuidle(void); extern bool cpuidle_not_available(struct cpuidle_driver drv, struct cpuidle_device dev); extern int cpuidle_select(struct cpuidle_driver drv, struct cpuidle_device dev, bool stop_tick); extern int cpuidle_enter(struct cpuidle_driver drv, struct cpuidle_device dev, int index); extern void cpuidle_reflect(struct cpuidle_device dev, int index); extern u64 cpuidle_poll_time(struct cpuidle_driver drv, struct cpuidle_device dev); 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 int cpuidle_register(struct cpuidle_driver drv, const struct cpumask const coupled_cpus); extern void cpuidle_unregister(struct cpuidle_driver drv); extern void cpuidle_pause_and_lock(void); extern void cpuidle_resume_and_unlock(void); extern void cpuidle_pause(void); extern void cpuidle_resume(void); extern int cpuidle_enable_device(struct cpuidle_device dev); extern void cpuidle_disable_device(struct cpuidle_device dev); extern int cpuidle_play_dead(void); extern struct cpuidle_driver cpuidle_get_cpu_driver(struct cpuidle_device dev); static inline struct cpuidle_device cpuidle_get_device(void) {return __this_cpu_read(cpuidle_devices); } #else static inline void disable_cpuidle(void) { } static inline bool cpuidle_not_available(struct cpuidle_driver drv, struct cpuidle_device dev) {return true; } static inline int cpuidle_select(struct cpuidle_driver drv, struct cpuidle_device dev, bool stop_tick) {return -ENODEV; } static inline int cpuidle_enter(struct cpuidle_driver drv, struct cpuidle_device dev, int index) {return -ENODEV; } static inline void cpuidle_reflect(struct cpuidle_device dev, int index) { } static inline u64 cpuidle_poll_time(struct cpuidle_driver drv, struct cpuidle_device dev) {return 0; } 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 int cpuidle_register(struct cpuidle_driver drv, const struct cpumask const coupled_cpus) {return -ENODEV; } static inline void cpuidle_unregister(struct cpuidle_driver drv) { } static inline void cpuidle_pause_and_lock(void) { } static inline void cpuidle_resume_and_unlock(void) { } static inline void cpuidle_pause(void) { } static inline void cpuidle_resume(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_play_dead(void) {return -ENODEV; } static inline struct cpuidle_driver cpuidle_get_cpu_driver( struct cpuidle_device dev) {return NULL; } static inline struct cpuidle_device cpuidle_get_device(void) {return NULL; } #endif #ifdef CONFIG_CPU_IDLE extern int cpuidle_find_deepest_state(struct cpuidle_driver drv, struct cpuidle_device dev); extern int cpuidle_enter_s2idle(struct cpuidle_driver drv, struct cpuidle_device dev); extern void cpuidle_use_deepest_state(bool enable); #else static inline int cpuidle_find_deepest_state(struct cpuidle_driver drv, struct cpuidle_device dev) {return -ENODEV; } static inline int cpuidle_enter_s2idle(struct cpuidle_driver drv, struct cpuidle_device dev) {return -ENODEV; } static inline void cpuidle_use_deepest_state(bool enable) { } #endif /* kernel/sched/idle.c / extern void sched_idle_set_state(struct cpuidle_state idle_state); extern void default_idle_call(void); #ifdef CONFIG_ARCH_NEEDS_CPU_IDLE_COUPLED void cpuidle_coupled_parallel_barrier(struct cpuidle_device dev, atomic_t a); #else static inline void cpuidle_coupled_parallel_barrier(struct cpuidle_device dev, atomic_t a) { } #endif #if defined(CONFIG_CPU_IDLE) && defined(CONFIG_ARCH_HAS_CPU_RELAX) void cpuidle_poll_state_init(struct cpuidle_driver drv); #else static inline void cpuidle_poll_state_init(struct cpuidle_driver drv) {} #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, bool stop_tick); void (reflect) (struct cpuidle_device dev, int index); }; #ifdef CONFIG_CPU_IDLE extern int cpuidle_register_governor(struct cpuidle_governor gov); extern int cpuidle_governor_latency_req(unsigned int cpu); #else static inline int cpuidle_register_governor(struct cpuidle_governor gov) {return 0;} #endif #define __CPU_PM_CPU_IDLE_ENTER(low_level_idle_enter, \ idx, \ state, \ is_retention) \ ({ \ int __ret = 0; \ \ if (!idx) { \ cpu_do_idle(); \ return idx; \ } \ \ if (!is_retention) \ __ret = cpu_pm_enter(); \ if (!__ret) { \ __ret = low_level_idle_enter(state); \ if (!is_retention) \ cpu_pm_exit(); \ } \ \ __ret ? -1 : idx; \ }) #define CPU_PM_CPU_IDLE_ENTER(low_level_idle_enter, idx) \ __CPU_PM_CPU_IDLE_ENTER(low_level_idle_enter, idx, idx, 0) #define CPU_PM_CPU_IDLE_ENTER_RETENTION(low_level_idle_enter, idx) \ __CPU_PM_CPU_IDLE_ENTER(low_level_idle_enter, idx, idx, 1) #define CPU_PM_CPU_IDLE_ENTER_PARAM(low_level_idle_enter, idx, state) \ __CPU_PM_CPU_IDLE_ENTER(low_level_idle_enter, idx, state, 0) #define CPU_PM_CPU_IDLE_ENTER_RETENTION_PARAM(low_level_idle_enter, idx, state) \ __CPU_PM_CPU_IDLE_ENTER(low_level_idle_enter, idx, state, 1) #endif / _LINUX_CPUIDLE_H */

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