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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313/* 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>#include <linux/static_key.h>
#ifdef CONFIG_GENERIC_CLOCKEVENTSextern 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);#else /* CONFIG_GENERIC_CLOCKEVENTS */static inline void tick_init(void) { }static inline void tick_suspend_local(void) { }static inline void tick_resume_local(void) { }#endif /* !CONFIG_GENERIC_CLOCKEVENTS */
#if defined(CONFIG_GENERIC_CLOCKEVENTS) && defined(CONFIG_HOTPLUG_CPU)extern int tick_cpu_dying(unsigned int cpu);extern void tick_assert_timekeeping_handover(void);#else#define tick_cpu_dying NULLstatic inline void tick_assert_timekeeping_handover(void) { }#endif
#if defined(CONFIG_GENERIC_CLOCKEVENTS) && defined(CONFIG_SUSPEND)extern void tick_freeze(void);extern void tick_unfreeze(void);#elsestatic inline void tick_freeze(void) { }static inline void tick_unfreeze(void) { }#endif
#ifdef CONFIG_TICK_ONESHOTextern void tick_irq_enter(void);# ifndef arch_needs_cpu# define arch_needs_cpu() (0)# endif# elsestatic 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);#elsestatic 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,};
extern struct static_key_false arch_needs_tick_broadcast;
#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCASTextern void tick_broadcast_control(enum tick_broadcast_mode mode);#elsestatic inline void tick_broadcast_control(enum tick_broadcast_mode mode) { }#endif /* BROADCAST */
#ifdef CONFIG_GENERIC_CLOCKEVENTSextern int tick_broadcast_oneshot_control(enum tick_broadcast_state state);#elsestatic 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_COMMONextern bool tick_nohz_enabled;extern bool tick_nohz_is_active(void);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_cpu(int cpu);#else /* !CONFIG_NO_HZ_COMMON */#define tick_nohz_enabled (0)static inline bool tick_nohz_is_active(void) { return false; }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;}#endif /* !CONFIG_NO_HZ_COMMON */
/* * Mask of CPUs that are nohz_full. * * Users should be guarded by CONFIG_NO_HZ_FULL or a tick_nohz_full_cpu() * check. */extern cpumask_var_t tick_nohz_full_mask;
#ifdef CONFIG_NO_HZ_FULLextern bool tick_nohz_full_running;
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; \})
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_init_task(struct task_struct *tsk){ atomic_set(&tsk->tick_dep_mask, 0);}
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);#elsestatic 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_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_init_task(struct task_struct *tsk) { }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