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linux-headers-5.4.0-113-generic
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tick.h
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/* 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> #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 }; #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) #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_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); } 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 signal_struct *signal, enum tick_dep_bits bit); extern void tick_nohz_dep_clear_signal(struct signal_struct *signal, enum tick_dep_bits bit); /* * 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 signal_struct *signal, enum tick_dep_bits bit) { if (tick_nohz_full_enabled()) tick_nohz_dep_set_signal(signal, 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_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 signal_struct *signal, 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(); } #endif