| /* 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); |
| |
| /* |
| * 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 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 |
