diff options
Diffstat (limited to 'include/linux/tick.h')
| -rw-r--r-- | include/linux/tick.h | 218 |
1 files changed, 218 insertions, 0 deletions
diff --git a/include/linux/tick.h b/include/linux/tick.h new file mode 100644 index 000000000000..d1162e9b7a36 --- /dev/null +++ b/include/linux/tick.h @@ -0,0 +1,218 @@ +/* + * Tick related global functions + */ +#ifndef _LINUX_TICK_H +#define _LINUX_TICK_H + +#include <linux/clockchips.h> +#include <linux/irqflags.h> +#include <linux/percpu.h> +#include <linux/context_tracking_state.h> +#include <linux/cpumask.h> +#include <linux/sched.h> + +#ifdef CONFIG_GENERIC_CLOCKEVENTS +extern void __init tick_init(void); +/* Should be core only, but ARM BL switcher requires it */ +extern void tick_suspend_local(void); +/* Should be core only, but XEN resume magic and ARM BL switcher require it */ +extern void tick_resume_local(void); +extern void tick_handover_do_timer(void); +extern void tick_cleanup_dead_cpu(int cpu); +#else /* CONFIG_GENERIC_CLOCKEVENTS */ +static inline void tick_init(void) { } +static inline void tick_suspend_local(void) { } +static inline void tick_resume_local(void) { } +static inline void tick_handover_do_timer(void) { } +static inline void tick_cleanup_dead_cpu(int cpu) { } +#endif /* !CONFIG_GENERIC_CLOCKEVENTS */ + +extern u64 jiffy_to_ktime_ns(u64 *now, u64 *jiffy_ktime_ns); + +#if defined(CONFIG_GENERIC_CLOCKEVENTS) && defined(CONFIG_SUSPEND) +extern void tick_freeze(void); +extern void tick_unfreeze(void); +#else +static inline void tick_freeze(void) { } +static inline void tick_unfreeze(void) { } +#endif + +#ifdef CONFIG_TICK_ONESHOT +extern void tick_irq_enter(void); +# ifndef arch_needs_cpu +# define arch_needs_cpu() (0) +# endif +# else +static inline void tick_irq_enter(void) { } +#endif + +#if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT) +extern void hotplug_cpu__broadcast_tick_pull(int dead_cpu); +#else +static inline void hotplug_cpu__broadcast_tick_pull(int dead_cpu) { } +#endif + +enum tick_broadcast_mode { + TICK_BROADCAST_OFF, + TICK_BROADCAST_ON, + TICK_BROADCAST_FORCE, +}; + +enum tick_broadcast_state { + TICK_BROADCAST_EXIT, + TICK_BROADCAST_ENTER, +}; + +#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST +extern void tick_broadcast_control(enum tick_broadcast_mode mode); +#else +static inline void tick_broadcast_control(enum tick_broadcast_mode mode) { } +#endif /* BROADCAST */ + +#ifdef CONFIG_GENERIC_CLOCKEVENTS +extern int tick_broadcast_oneshot_control(enum tick_broadcast_state state); +#else +static inline int tick_broadcast_oneshot_control(enum tick_broadcast_state state) +{ + return 0; +} +#endif + +static inline void tick_broadcast_enable(void) +{ + tick_broadcast_control(TICK_BROADCAST_ON); +} +static inline void tick_broadcast_disable(void) +{ + tick_broadcast_control(TICK_BROADCAST_OFF); +} +static inline void tick_broadcast_force(void) +{ + tick_broadcast_control(TICK_BROADCAST_FORCE); +} +static inline int tick_broadcast_enter(void) +{ + return tick_broadcast_oneshot_control(TICK_BROADCAST_ENTER); +} +static inline void tick_broadcast_exit(void) +{ + tick_broadcast_oneshot_control(TICK_BROADCAST_EXIT); +} + +#ifdef CONFIG_NO_HZ_COMMON +extern int tick_nohz_tick_stopped(void); +extern void tick_nohz_idle_enter(void); +extern void tick_nohz_idle_exit(void); +extern void tick_nohz_irq_exit(void); +extern ktime_t tick_nohz_get_sleep_length(void); +extern unsigned long tick_nohz_get_idle_calls(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 /* !CONFIG_NO_HZ_COMMON */ +static inline int tick_nohz_tick_stopped(void) { return 0; } +static inline void tick_nohz_idle_enter(void) { } +static inline void tick_nohz_idle_exit(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 /* !CONFIG_NO_HZ_COMMON */ + +#ifdef CONFIG_NO_HZ_FULL +extern bool tick_nohz_full_running; +extern cpumask_var_t tick_nohz_full_mask; +extern cpumask_var_t housekeeping_mask; + +static inline bool tick_nohz_full_enabled(void) +{ + if (!context_tracking_is_enabled()) + return false; + + return tick_nohz_full_running; +} + +static inline bool tick_nohz_full_cpu(int cpu) +{ + if (!tick_nohz_full_enabled()) + return false; + + return cpumask_test_cpu(cpu, tick_nohz_full_mask); +} + +static inline void tick_nohz_full_add_cpus_to(struct cpumask *mask) +{ + if (tick_nohz_full_enabled()) + cpumask_or(mask, mask, tick_nohz_full_mask); +} + +static inline int housekeeping_any_cpu(void) +{ + return cpumask_any_and(housekeeping_mask, cpu_online_mask); +} + +extern void tick_nohz_full_kick(void); +extern void tick_nohz_full_kick_cpu(int cpu); +extern void tick_nohz_full_kick_all(void); +extern void __tick_nohz_task_switch(void); +#else +static inline int housekeeping_any_cpu(void) +{ + cpumask_t available; + int cpu; + + cpumask_andnot(&available, cpu_online_mask, cpu_isolated_mask); + cpu = cpumask_any(&available); + if (cpu >= nr_cpu_ids) + cpu = smp_processor_id(); + + return cpu; +} +static inline bool tick_nohz_full_enabled(void) { return false; } +static inline bool tick_nohz_full_cpu(int cpu) { return false; } +static inline void tick_nohz_full_add_cpus_to(struct cpumask *mask) { } +static inline void tick_nohz_full_kick_cpu(int cpu) { } +static inline void tick_nohz_full_kick(void) { } +static inline void tick_nohz_full_kick_all(void) { } +static inline void __tick_nohz_task_switch(void) { } +#endif + +static inline const struct cpumask *housekeeping_cpumask(void) +{ +#ifdef CONFIG_NO_HZ_FULL + if (tick_nohz_full_enabled()) + return housekeeping_mask; +#endif + return cpu_possible_mask; +} + +static inline bool is_housekeeping_cpu(int cpu) +{ +#ifdef CONFIG_NO_HZ_FULL + if (tick_nohz_full_enabled()) + return cpumask_test_cpu(cpu, housekeeping_mask); +#endif + return !cpu_isolated(cpu); +} + +static inline void housekeeping_affine(struct task_struct *t) +{ +#ifdef CONFIG_NO_HZ_FULL + if (tick_nohz_full_enabled()) + set_cpus_allowed_ptr(t, housekeeping_mask); + +#endif +} + +static inline void tick_nohz_task_switch(void) +{ + if (tick_nohz_full_enabled()) + __tick_nohz_task_switch(); +} + +ktime_t *get_next_event_cpu(unsigned int cpu); +#endif |