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Diffstat (limited to 'include/linux/tick.h')
| -rw-r--r-- | include/linux/tick.h | 316 |
1 files changed, 316 insertions, 0 deletions
diff --git a/include/linux/tick.h b/include/linux/tick.h new file mode 100644 index 000000000..9459fef5b --- /dev/null +++ b/include/linux/tick.h @@ -0,0 +1,316 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * 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> +#include <linux/rcupdate.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 */ + +#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 */ + +#if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_HOTPLUG_CPU) +extern void tick_offline_cpu(unsigned int cpu); +#else +static inline void tick_offline_cpu(unsigned int cpu) { } +#endif + +#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); +} + +enum tick_dep_bits { + TICK_DEP_BIT_POSIX_TIMER = 0, + TICK_DEP_BIT_PERF_EVENTS = 1, + TICK_DEP_BIT_SCHED = 2, + TICK_DEP_BIT_CLOCK_UNSTABLE = 3, + TICK_DEP_BIT_RCU = 4, + TICK_DEP_BIT_RCU_EXP = 5 +}; +#define TICK_DEP_BIT_MAX TICK_DEP_BIT_RCU_EXP + +#define TICK_DEP_MASK_NONE 0 +#define TICK_DEP_MASK_POSIX_TIMER (1 << TICK_DEP_BIT_POSIX_TIMER) +#define TICK_DEP_MASK_PERF_EVENTS (1 << TICK_DEP_BIT_PERF_EVENTS) +#define TICK_DEP_MASK_SCHED (1 << TICK_DEP_BIT_SCHED) +#define TICK_DEP_MASK_CLOCK_UNSTABLE (1 << TICK_DEP_BIT_CLOCK_UNSTABLE) +#define TICK_DEP_MASK_RCU (1 << TICK_DEP_BIT_RCU) +#define TICK_DEP_MASK_RCU_EXP (1 << TICK_DEP_BIT_RCU_EXP) + +#ifdef CONFIG_NO_HZ_COMMON +extern bool tick_nohz_enabled; +extern bool tick_nohz_tick_stopped(void); +extern bool tick_nohz_tick_stopped_cpu(int cpu); +extern void tick_nohz_idle_stop_tick(void); +extern void tick_nohz_idle_retain_tick(void); +extern void tick_nohz_idle_restart_tick(void); +extern void tick_nohz_idle_enter(void); +extern void tick_nohz_idle_exit(void); +extern void tick_nohz_irq_exit(void); +extern bool tick_nohz_idle_got_tick(void); +extern ktime_t tick_nohz_get_next_hrtimer(void); +extern ktime_t tick_nohz_get_sleep_length(ktime_t *delta_next); +extern unsigned long tick_nohz_get_idle_calls(void); +extern unsigned long tick_nohz_get_idle_calls_cpu(int cpu); +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); + +static inline void tick_nohz_idle_stop_tick_protected(void) +{ + local_irq_disable(); + tick_nohz_idle_stop_tick(); + local_irq_enable(); +} + +#else /* !CONFIG_NO_HZ_COMMON */ +#define tick_nohz_enabled (0) +static inline int tick_nohz_tick_stopped(void) { return 0; } +static inline int tick_nohz_tick_stopped_cpu(int cpu) { return 0; } +static inline void tick_nohz_idle_stop_tick(void) { } +static inline void tick_nohz_idle_retain_tick(void) { } +static inline void tick_nohz_idle_restart_tick(void) { } +static inline void tick_nohz_idle_enter(void) { } +static inline void tick_nohz_idle_exit(void) { } +static inline bool tick_nohz_idle_got_tick(void) { return false; } +static inline ktime_t tick_nohz_get_next_hrtimer(void) +{ + /* Next wake up is the tick period, assume it starts now */ + return ktime_add(ktime_get(), TICK_NSEC); +} +static inline ktime_t tick_nohz_get_sleep_length(ktime_t *delta_next) +{ + *delta_next = TICK_NSEC; + return *delta_next; +} +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; } + +static inline void tick_nohz_idle_stop_tick_protected(void) { } +#endif /* !CONFIG_NO_HZ_COMMON */ + +#ifdef CONFIG_NO_HZ_FULL +extern bool tick_nohz_full_running; +extern cpumask_var_t tick_nohz_full_mask; + +static inline bool tick_nohz_full_enabled(void) +{ + if (!context_tracking_enabled()) + return false; + + return tick_nohz_full_running; +} + +/* + * Check if a CPU is part of the nohz_full subset. Arrange for evaluating + * the cpu expression (typically smp_processor_id()) _after_ the static + * key. + */ +#define tick_nohz_full_cpu(_cpu) ({ \ + bool __ret = false; \ + if (tick_nohz_full_enabled()) \ + __ret = cpumask_test_cpu((_cpu), tick_nohz_full_mask); \ + __ret; \ +}) + +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); +} + +extern void tick_nohz_dep_set(enum tick_dep_bits bit); +extern void tick_nohz_dep_clear(enum tick_dep_bits bit); +extern void tick_nohz_dep_set_cpu(int cpu, enum tick_dep_bits bit); +extern void tick_nohz_dep_clear_cpu(int cpu, enum tick_dep_bits bit); +extern void tick_nohz_dep_set_task(struct task_struct *tsk, + enum tick_dep_bits bit); +extern void tick_nohz_dep_clear_task(struct task_struct *tsk, + enum tick_dep_bits bit); +extern void tick_nohz_dep_set_signal(struct task_struct *tsk, + enum tick_dep_bits bit); +extern void tick_nohz_dep_clear_signal(struct signal_struct *signal, + enum tick_dep_bits bit); +extern bool tick_nohz_cpu_hotpluggable(unsigned int cpu); + +/* + * The below are tick_nohz_[set,clear]_dep() wrappers that optimize off-cases + * on top of static keys. + */ +static inline void tick_dep_set(enum tick_dep_bits bit) +{ + if (tick_nohz_full_enabled()) + tick_nohz_dep_set(bit); +} + +static inline void tick_dep_clear(enum tick_dep_bits bit) +{ + if (tick_nohz_full_enabled()) + tick_nohz_dep_clear(bit); +} + +static inline void tick_dep_set_cpu(int cpu, enum tick_dep_bits bit) +{ + if (tick_nohz_full_cpu(cpu)) + tick_nohz_dep_set_cpu(cpu, bit); +} + +static inline void tick_dep_clear_cpu(int cpu, enum tick_dep_bits bit) +{ + if (tick_nohz_full_cpu(cpu)) + tick_nohz_dep_clear_cpu(cpu, bit); +} + +static inline void tick_dep_set_task(struct task_struct *tsk, + enum tick_dep_bits bit) +{ + if (tick_nohz_full_enabled()) + tick_nohz_dep_set_task(tsk, bit); +} +static inline void tick_dep_clear_task(struct task_struct *tsk, + enum tick_dep_bits bit) +{ + if (tick_nohz_full_enabled()) + tick_nohz_dep_clear_task(tsk, bit); +} +static inline void tick_dep_set_signal(struct task_struct *tsk, + enum tick_dep_bits bit) +{ + if (tick_nohz_full_enabled()) + tick_nohz_dep_set_signal(tsk, bit); +} +static inline void tick_dep_clear_signal(struct signal_struct *signal, + enum tick_dep_bits bit) +{ + if (tick_nohz_full_enabled()) + tick_nohz_dep_clear_signal(signal, bit); +} + +extern void tick_nohz_full_kick_cpu(int cpu); +extern void __tick_nohz_task_switch(void); +extern void __init tick_nohz_full_setup(cpumask_var_t cpumask); +#else +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_dep_set_cpu(int cpu, enum tick_dep_bits bit) { } +static inline void tick_nohz_dep_clear_cpu(int cpu, enum tick_dep_bits bit) { } +static inline bool tick_nohz_cpu_hotpluggable(unsigned int cpu) { return true; } + +static inline void tick_dep_set(enum tick_dep_bits bit) { } +static inline void tick_dep_clear(enum tick_dep_bits bit) { } +static inline void tick_dep_set_cpu(int cpu, enum tick_dep_bits bit) { } +static inline void tick_dep_clear_cpu(int cpu, enum tick_dep_bits bit) { } +static inline void tick_dep_set_task(struct task_struct *tsk, + enum tick_dep_bits bit) { } +static inline void tick_dep_clear_task(struct task_struct *tsk, + enum tick_dep_bits bit) { } +static inline void tick_dep_set_signal(struct task_struct *tsk, + enum tick_dep_bits bit) { } +static inline void tick_dep_clear_signal(struct signal_struct *signal, + enum tick_dep_bits bit) { } + +static inline void tick_nohz_full_kick_cpu(int cpu) { } +static inline void __tick_nohz_task_switch(void) { } +static inline void tick_nohz_full_setup(cpumask_var_t cpumask) { } +#endif + +static inline void tick_nohz_task_switch(void) +{ + if (tick_nohz_full_enabled()) + __tick_nohz_task_switch(); +} + +static inline void tick_nohz_user_enter_prepare(void) +{ + if (tick_nohz_full_cpu(smp_processor_id())) + rcu_nocb_flush_deferred_wakeup(); +} + +#endif |