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Diffstat (limited to 'include/linux/tick.h')
| -rw-r--r-- | include/linux/tick.h | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/include/linux/tick.h b/include/linux/tick.h new file mode 100644 index 00000000..b232ccc0 --- /dev/null +++ b/include/linux/tick.h @@ -0,0 +1,142 @@ +/* linux/include/linux/tick.h + * + * This file contains the structure definitions for tick related functions + * + */ +#ifndef _LINUX_TICK_H +#define _LINUX_TICK_H + +#include <linux/clockchips.h> + +#ifdef CONFIG_GENERIC_CLOCKEVENTS + +enum tick_device_mode { + TICKDEV_MODE_PERIODIC, + TICKDEV_MODE_ONESHOT, +}; + +struct tick_device { + struct clock_event_device *evtdev; + enum tick_device_mode mode; +}; + +enum tick_nohz_mode { + NOHZ_MODE_INACTIVE, + NOHZ_MODE_LOWRES, + NOHZ_MODE_HIGHRES, +}; + +/** + * struct tick_sched - sched tick emulation and no idle tick control/stats + * @sched_timer: hrtimer to schedule the periodic tick in high + * resolution mode + * @idle_tick: Store the last idle tick expiry time when the tick + * timer is modified for idle sleeps. This is necessary + * to resume the tick timer operation in the timeline + * when the CPU returns from idle + * @tick_stopped: Indicator that the idle tick has been stopped + * @idle_jiffies: jiffies at the entry to idle for idle time accounting + * @idle_calls: Total number of idle calls + * @idle_sleeps: Number of idle calls, where the sched tick was stopped + * @idle_entrytime: Time when the idle call was entered + * @idle_waketime: Time when the idle was interrupted + * @idle_exittime: Time when the idle state was left + * @idle_sleeptime: Sum of the time slept in idle with sched tick stopped + * @iowait_sleeptime: Sum of the time slept in idle with sched tick stopped, with IO outstanding + * @sleep_length: Duration of the current idle sleep + * @do_timer_lst: CPU was the last one doing do_timer before going idle + */ +struct tick_sched { + struct hrtimer sched_timer; + unsigned long check_clocks; + enum tick_nohz_mode nohz_mode; + ktime_t idle_tick; + int inidle; + int tick_stopped; + unsigned long idle_jiffies; + unsigned long idle_calls; + unsigned long idle_sleeps; + int idle_active; + ktime_t idle_entrytime; + ktime_t idle_waketime; + ktime_t idle_exittime; + ktime_t idle_sleeptime; + ktime_t iowait_sleeptime; + ktime_t sleep_length; + unsigned long last_jiffies; + unsigned long next_jiffies; + ktime_t idle_expires; + int do_timer_last; +}; + +extern void __init tick_init(void); +extern int tick_is_oneshot_available(void); +extern struct tick_device *tick_get_device(int cpu); + +# ifdef CONFIG_HIGH_RES_TIMERS +extern int tick_init_highres(void); +extern int tick_program_event(ktime_t expires, int force); +extern void tick_setup_sched_timer(void); +# endif + +# if defined CONFIG_NO_HZ || defined CONFIG_HIGH_RES_TIMERS +extern void tick_cancel_sched_timer(int cpu); +# else +static inline void tick_cancel_sched_timer(int cpu) { } +# endif + +# ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST +extern struct tick_device *tick_get_broadcast_device(void); +extern struct cpumask *tick_get_broadcast_mask(void); + +# ifdef CONFIG_TICK_ONESHOT +extern struct cpumask *tick_get_broadcast_oneshot_mask(void); +# endif + +# endif /* BROADCAST */ + +# ifdef CONFIG_TICK_ONESHOT +extern void tick_clock_notify(void); +extern int tick_check_oneshot_change(int allow_nohz); +extern struct tick_sched *tick_get_tick_sched(int cpu); +extern void tick_check_idle(int cpu); +extern int tick_oneshot_mode_active(void); +# ifndef arch_needs_cpu +# define arch_needs_cpu(cpu) (0) +# endif +# else +static inline void tick_clock_notify(void) { } +static inline int tick_check_oneshot_change(int allow_nohz) { return 0; } +static inline void tick_check_idle(int cpu) { } +static inline int tick_oneshot_mode_active(void) { return 0; } +# endif + +#else /* CONFIG_GENERIC_CLOCKEVENTS */ +static inline void tick_init(void) { } +static inline void tick_cancel_sched_timer(int cpu) { } +static inline void tick_clock_notify(void) { } +static inline int tick_check_oneshot_change(int allow_nohz) { return 0; } +static inline void tick_check_idle(int cpu) { } +static inline int tick_oneshot_mode_active(void) { return 0; } +#endif /* !CONFIG_GENERIC_CLOCKEVENTS */ + +# ifdef CONFIG_NO_HZ +extern void tick_nohz_stop_sched_tick(int inidle); +extern void tick_nohz_restart_sched_tick(void); +extern ktime_t tick_nohz_get_sleep_length(void); +extern u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time); +extern u64 get_cpu_iowait_time_us(int cpu, u64 *last_update_time); +# else +static inline void tick_nohz_stop_sched_tick(int inidle) { } +static inline void tick_nohz_restart_sched_tick(void) { } +static inline ktime_t tick_nohz_get_sleep_length(void) +{ + ktime_t len = { .tv64 = NSEC_PER_SEC/HZ }; + + return len; +} +static inline u64 get_cpu_idle_time_us(int cpu, u64 *unused) { return -1; } +static inline u64 get_cpu_iowait_time_us(int cpu, u64 *unused) { return -1; } +# endif /* !NO_HZ */ + +#endif |