/* SPDX-License-Identifier: GPL-2.0 *//* * tick internal variable and functions used by low/high res code */#include <linux/hrtimer.h>#include <linux/hrtimer_bases.h>#include <linux/tick.h> #include "timekeeping.h"#include "tick-sched.h" struct timer_events {	u64	local;	u64	global;}; #ifdef CONFIG_GENERIC_CLOCKEVENTS # define TICK_DO_TIMER_NONE	-1# define TICK_DO_TIMER_BOOT	-2 DECLARE_PER_CPU(struct tick_device, tick_cpu_device);extern ktime_t tick_next_period;extern int tick_do_timer_cpu __read_mostly; extern void tick_setup_periodic(struct clock_event_device *dev, int broadcast);extern void tick_handle_periodic(struct clock_event_device *dev);extern void tick_check_new_device(struct clock_event_device *dev);extern void tick_offline_cpu(unsigned int cpu);extern void tick_shutdown(void);extern void tick_suspend(void);extern void tick_resume(void);extern bool tick_check_replacement(struct clock_event_device *curdev,				   struct clock_event_device *newdev);extern void tick_install_replacement(struct clock_event_device *dev);extern int tick_is_oneshot_available(void);extern struct tick_device *tick_get_device(int cpu); extern int clockevents_tick_resume(struct clock_event_device *dev);/* Check, if the device is functional or a dummy for broadcast */static inline int tick_device_is_functional(struct clock_event_device *dev){	return !(dev->features & CLOCK_EVT_FEAT_DUMMY);} static inline enum clock_event_state clockevent_get_state(struct clock_event_device *dev){	return dev->state_use_accessors;} static inline void clockevent_set_state(struct clock_event_device *dev,					enum clock_event_state state){	dev->state_use_accessors = state;} extern void clockevents_shutdown(struct clock_event_device *dev);extern void clockevents_exchange_device(struct clock_event_device *old,					struct clock_event_device *new);extern void clockevents_switch_state(struct clock_event_device *dev,				     enum clock_event_state state);extern int clockevents_program_event(struct clock_event_device *dev,				     ktime_t expires, bool force);extern void clockevents_handle_noop(struct clock_event_device *dev);extern int __clockevents_update_freq(struct clock_event_device *dev, u32 freq); /* Broadcasting support */# ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCASTextern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu);extern void tick_install_broadcast_device(struct clock_event_device *dev, int cpu);extern int tick_is_broadcast_device(struct clock_event_device *dev);extern void tick_suspend_broadcast(void);extern void tick_resume_broadcast(void);extern bool tick_resume_check_broadcast(void);extern void tick_broadcast_init(void);extern void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast);extern int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq);extern struct tick_device *tick_get_broadcast_device(void);extern struct cpumask *tick_get_broadcast_mask(void);extern const struct clock_event_device *tick_get_wakeup_device(int cpu);# else /* !CONFIG_GENERIC_CLOCKEVENTS_BROADCAST: */static inline void tick_install_broadcast_device(struct clock_event_device *dev, int cpu) { }static inline int tick_is_broadcast_device(struct clock_event_device *dev) { return 0; }static inline int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu) { return 0; }static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { }static inline void tick_suspend_broadcast(void) { }static inline void tick_resume_broadcast(void) { }static inline bool tick_resume_check_broadcast(void) { return false; }static inline void tick_broadcast_init(void) { }static inline int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq) { return -ENODEV; } /* Set the periodic handler in non broadcast mode */static inline void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast){	dev->event_handler = tick_handle_periodic;}# endif /* !CONFIG_GENERIC_CLOCKEVENTS_BROADCAST */ #else /* !GENERIC_CLOCKEVENTS: */static inline void tick_suspend(void) { }static inline void tick_resume(void) { }#endif /* !GENERIC_CLOCKEVENTS */ /* Oneshot related functions */#ifdef CONFIG_TICK_ONESHOTextern void tick_setup_oneshot(struct clock_event_device *newdev,			       void (*handler)(struct clock_event_device *),			       ktime_t nextevt);extern int tick_program_event(ktime_t expires, int force);extern void tick_oneshot_notify(void);extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *));extern void tick_resume_oneshot(void);static inline bool tick_oneshot_possible(void) { return true; }extern int tick_oneshot_mode_active(void);extern void tick_clock_notify(void);extern int tick_check_oneshot_change(int allow_nohz);extern int tick_init_highres(void);#else /* !CONFIG_TICK_ONESHOT: */static inlinevoid tick_setup_oneshot(struct clock_event_device *newdev,			void (*handler)(struct clock_event_device *),			ktime_t nextevt) { BUG(); }static inline void tick_resume_oneshot(void) { BUG(); }static inline int tick_program_event(ktime_t expires, int force) { return 0; }static inline void tick_oneshot_notify(void) { }static inline bool tick_oneshot_possible(void) { return false; }static inline int tick_oneshot_mode_active(void) { return 0; }static inline void tick_clock_notify(void) { }static inline int tick_check_oneshot_change(int allow_nohz) { return 0; }#endif /* !CONFIG_TICK_ONESHOT */ /* Functions related to oneshot broadcasting */#if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT)extern void tick_broadcast_switch_to_oneshot(void);extern int tick_broadcast_oneshot_active(void);extern void tick_check_oneshot_broadcast_this_cpu(void);bool tick_broadcast_oneshot_available(void);extern struct cpumask *tick_get_broadcast_oneshot_mask(void);#else /* !(BROADCAST && ONESHOT): */static inline void tick_broadcast_switch_to_oneshot(void) { }static inline int tick_broadcast_oneshot_active(void) { return 0; }static inline void tick_check_oneshot_broadcast_this_cpu(void) { }static inline bool tick_broadcast_oneshot_available(void) { return tick_oneshot_possible(); }#endif /* !(BROADCAST && ONESHOT) */ #if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_HOTPLUG_CPU)extern void tick_broadcast_offline(unsigned int cpu);#elsestatic inline void tick_broadcast_offline(unsigned int cpu) { }#endif /* NO_HZ_FULL internal */#ifdef CONFIG_NO_HZ_FULLextern void tick_nohz_init(void);# elsestatic inline void tick_nohz_init(void) { }#endif #ifdef CONFIG_NO_HZ_COMMONextern void timers_update_nohz(void);extern u64 get_jiffies_update(unsigned long *basej);# ifdef CONFIG_SMPextern struct static_key_false timers_migration_enabled;extern void fetch_next_timer_interrupt_remote(unsigned long basej, u64 basem,					      struct timer_events *tevt,					      unsigned int cpu);extern void timer_lock_remote_bases(unsigned int cpu);extern void timer_unlock_remote_bases(unsigned int cpu);extern bool timer_base_is_idle(void);extern void timer_expire_remote(unsigned int cpu);# endif#else /* CONFIG_NO_HZ_COMMON */static inline void timers_update_nohz(void) { }#endif DECLARE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases); extern u64 get_next_timer_interrupt(unsigned long basej, u64 basem);u64 timer_base_try_to_set_idle(unsigned long basej, u64 basem, bool *idle);void timer_clear_idle(void); #define CLOCK_SET_WALL							\	(BIT(HRTIMER_BASE_REALTIME) | BIT(HRTIMER_BASE_REALTIME_SOFT) |	\	 BIT(HRTIMER_BASE_TAI) | BIT(HRTIMER_BASE_TAI_SOFT)) #define CLOCK_SET_BOOT							\	(BIT(HRTIMER_BASE_BOOTTIME) | BIT(HRTIMER_BASE_BOOTTIME_SOFT)) void clock_was_set(unsigned int bases);void clock_was_set_delayed(void); void hrtimers_resume_local(void); /* Since jiffies uses a simple TICK_NSEC multiplier * conversion, the .shift value could be zero. However * this would make NTP adjustments impossible as they are * in units of 1/2^.shift. Thus we use JIFFIES_SHIFT to * shift both the nominator and denominator the same * amount, and give ntp adjustments in units of 1/2^8 * * The value 8 is somewhat carefully chosen, as anything * larger can result in overflows. TICK_NSEC grows as HZ * shrinks, so values greater than 8 overflow 32bits when * HZ=100. */#if HZ < 34#define JIFFIES_SHIFT	6#elif HZ < 67#define JIFFIES_SHIFT	7#else#define JIFFIES_SHIFT	8#endif extern ssize_t sysfs_get_uname(const char *buf, char *dst, size_t cnt);