1b2441318SGreg Kroah-Hartman /* SPDX-License-Identifier: GPL-2.0 */ 2f8381cbaSThomas Gleixner /* 3f8381cbaSThomas Gleixner * tick internal variable and functions used by low/high res code 4f8381cbaSThomas Gleixner */ 5e2830b5cSTorben Hohn #include <linux/hrtimer.h> 6e2830b5cSTorben Hohn #include <linux/tick.h> 76441402bSThomas Gleixner 88b094cd0SThomas Gleixner #include "timekeeping.h" 9c1797bafSThomas Gleixner #include "tick-sched.h" 108b094cd0SThomas Gleixner 119f083b74SThomas Gleixner #ifdef CONFIG_GENERIC_CLOCKEVENTS 126441402bSThomas Gleixner 136441402bSThomas Gleixner # define TICK_DO_TIMER_NONE -1 146441402bSThomas Gleixner # define TICK_DO_TIMER_BOOT -2 156441402bSThomas Gleixner 16f8381cbaSThomas Gleixner DECLARE_PER_CPU(struct tick_device, tick_cpu_device); 17f8381cbaSThomas Gleixner extern ktime_t tick_next_period; 18f8381cbaSThomas Gleixner extern ktime_t tick_period; 19d3ed7824SThomas Gleixner extern int tick_do_timer_cpu __read_mostly; 20f8381cbaSThomas Gleixner 21f8381cbaSThomas Gleixner extern void tick_setup_periodic(struct clock_event_device *dev, int broadcast); 22f8381cbaSThomas Gleixner extern void tick_handle_periodic(struct clock_event_device *dev); 237172a286SThomas Gleixner extern void tick_check_new_device(struct clock_event_device *dev); 24a49b116dSThomas Gleixner extern void tick_shutdown(unsigned int cpu); 258c53daf6SThomas Gleixner extern void tick_suspend(void); 26f46481d0SThomas Gleixner extern void tick_resume(void); 2703e13cf5SThomas Gleixner extern bool tick_check_replacement(struct clock_event_device *curdev, 2803e13cf5SThomas Gleixner struct clock_event_device *newdev); 2903e13cf5SThomas Gleixner extern void tick_install_replacement(struct clock_event_device *dev); 30c1797bafSThomas Gleixner extern int tick_is_oneshot_available(void); 317270d11cSThomas Gleixner extern struct tick_device *tick_get_device(int cpu); 32f8381cbaSThomas Gleixner 33554ef387SViresh Kumar extern int clockevents_tick_resume(struct clock_event_device *dev); 34b7475eb5SThomas Gleixner /* Check, if the device is functional or a dummy for broadcast */ 35b7475eb5SThomas Gleixner static inline int tick_device_is_functional(struct clock_event_device *dev) 36b7475eb5SThomas Gleixner { 37b7475eb5SThomas Gleixner return !(dev->features & CLOCK_EVT_FEAT_DUMMY); 38b7475eb5SThomas Gleixner } 392344abbcSThomas Gleixner 40d7eb231cSThomas Gleixner static inline enum clock_event_state clockevent_get_state(struct clock_event_device *dev) 41d7eb231cSThomas Gleixner { 42be3ef76eSThomas Gleixner return dev->state_use_accessors; 43d7eb231cSThomas Gleixner } 44d7eb231cSThomas Gleixner 45d7eb231cSThomas Gleixner static inline void clockevent_set_state(struct clock_event_device *dev, 46d7eb231cSThomas Gleixner enum clock_event_state state) 47d7eb231cSThomas Gleixner { 48be3ef76eSThomas Gleixner dev->state_use_accessors = state; 49d7eb231cSThomas Gleixner } 50d7eb231cSThomas Gleixner 51b7475eb5SThomas Gleixner extern void clockevents_shutdown(struct clock_event_device *dev); 52c1797bafSThomas Gleixner extern void clockevents_exchange_device(struct clock_event_device *old, 53c1797bafSThomas Gleixner struct clock_event_device *new); 54d7eb231cSThomas Gleixner extern void clockevents_switch_state(struct clock_event_device *dev, 557270d11cSThomas Gleixner enum clock_event_state state); 567270d11cSThomas Gleixner extern int clockevents_program_event(struct clock_event_device *dev, 577270d11cSThomas Gleixner ktime_t expires, bool force); 58c1797bafSThomas Gleixner extern void clockevents_handle_noop(struct clock_event_device *dev); 59b7475eb5SThomas Gleixner extern int __clockevents_update_freq(struct clock_event_device *dev, u32 freq); 60891292a7SPatrick Palka extern ssize_t sysfs_get_uname(const char *buf, char *dst, size_t cnt); 6179bf2bb3SThomas Gleixner 62b7475eb5SThomas Gleixner /* Broadcasting support */ 63f8381cbaSThomas Gleixner # ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST 64f8381cbaSThomas Gleixner extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu); 657172a286SThomas Gleixner extern void tick_install_broadcast_device(struct clock_event_device *dev); 66f8381cbaSThomas Gleixner extern int tick_is_broadcast_device(struct clock_event_device *dev); 67a49b116dSThomas Gleixner extern void tick_shutdown_broadcast(unsigned int cpu); 686321dd60SThomas Gleixner extern void tick_suspend_broadcast(void); 69f46481d0SThomas Gleixner extern void tick_resume_broadcast(void); 70f46481d0SThomas Gleixner extern bool tick_resume_check_broadcast(void); 71b352bc1cSThomas Gleixner extern void tick_broadcast_init(void); 72b7475eb5SThomas Gleixner extern void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast); 73b7475eb5SThomas Gleixner extern int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq); 74c1797bafSThomas Gleixner extern struct tick_device *tick_get_broadcast_device(void); 75c1797bafSThomas Gleixner extern struct cpumask *tick_get_broadcast_mask(void); 763ae7a939SIngo Molnar # else /* !CONFIG_GENERIC_CLOCKEVENTS_BROADCAST: */ 77b7475eb5SThomas Gleixner static inline void tick_install_broadcast_device(struct clock_event_device *dev) { } 78b7475eb5SThomas Gleixner static inline int tick_is_broadcast_device(struct clock_event_device *dev) { return 0; } 79b7475eb5SThomas Gleixner static inline int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu) { return 0; } 80f8381cbaSThomas Gleixner static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { } 81a49b116dSThomas Gleixner static inline void tick_shutdown_broadcast(unsigned int cpu) { } 826321dd60SThomas Gleixner static inline void tick_suspend_broadcast(void) { } 83f46481d0SThomas Gleixner static inline void tick_resume_broadcast(void) { } 84f46481d0SThomas Gleixner static inline bool tick_resume_check_broadcast(void) { return false; } 85b352bc1cSThomas Gleixner static inline void tick_broadcast_init(void) { } 86b7475eb5SThomas Gleixner static inline int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq) { return -ENODEV; } 87f8381cbaSThomas Gleixner 88b7475eb5SThomas Gleixner /* Set the periodic handler in non broadcast mode */ 89b7475eb5SThomas Gleixner static inline void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast) 90f8381cbaSThomas Gleixner { 91f8381cbaSThomas Gleixner dev->event_handler = tick_handle_periodic; 92f8381cbaSThomas Gleixner } 933ae7a939SIngo Molnar # endif /* !CONFIG_GENERIC_CLOCKEVENTS_BROADCAST */ 943ae7a939SIngo Molnar 953ae7a939SIngo Molnar #else /* !GENERIC_CLOCKEVENTS: */ 963ae7a939SIngo Molnar static inline void tick_suspend(void) { } 973ae7a939SIngo Molnar static inline void tick_resume(void) { } 983ae7a939SIngo Molnar #endif /* !GENERIC_CLOCKEVENTS */ 993ae7a939SIngo Molnar 1003ae7a939SIngo Molnar /* Oneshot related functions */ 1013ae7a939SIngo Molnar #ifdef CONFIG_TICK_ONESHOT 1023ae7a939SIngo Molnar extern void tick_setup_oneshot(struct clock_event_device *newdev, 1033ae7a939SIngo Molnar void (*handler)(struct clock_event_device *), 1043ae7a939SIngo Molnar ktime_t nextevt); 1053ae7a939SIngo Molnar extern int tick_program_event(ktime_t expires, int force); 1063ae7a939SIngo Molnar extern void tick_oneshot_notify(void); 1073ae7a939SIngo Molnar extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *)); 1083ae7a939SIngo Molnar extern void tick_resume_oneshot(void); 1093ae7a939SIngo Molnar static inline bool tick_oneshot_possible(void) { return true; } 1103ae7a939SIngo Molnar extern int tick_oneshot_mode_active(void); 1113ae7a939SIngo Molnar extern void tick_clock_notify(void); 1123ae7a939SIngo Molnar extern int tick_check_oneshot_change(int allow_nohz); 1133ae7a939SIngo Molnar extern int tick_init_highres(void); 1143ae7a939SIngo Molnar #else /* !CONFIG_TICK_ONESHOT: */ 1153ae7a939SIngo Molnar static inline 1163ae7a939SIngo Molnar void tick_setup_oneshot(struct clock_event_device *newdev, 1173ae7a939SIngo Molnar void (*handler)(struct clock_event_device *), 1183ae7a939SIngo Molnar ktime_t nextevt) { BUG(); } 1193ae7a939SIngo Molnar static inline void tick_resume_oneshot(void) { BUG(); } 1203ae7a939SIngo Molnar static inline int tick_program_event(ktime_t expires, int force) { return 0; } 1213ae7a939SIngo Molnar static inline void tick_oneshot_notify(void) { } 1223ae7a939SIngo Molnar static inline bool tick_oneshot_possible(void) { return false; } 1233ae7a939SIngo Molnar static inline int tick_oneshot_mode_active(void) { return 0; } 1243ae7a939SIngo Molnar static inline void tick_clock_notify(void) { } 1253ae7a939SIngo Molnar static inline int tick_check_oneshot_change(int allow_nohz) { return 0; } 1263ae7a939SIngo Molnar #endif /* !CONFIG_TICK_ONESHOT */ 127f8381cbaSThomas Gleixner 128b7475eb5SThomas Gleixner /* Functions related to oneshot broadcasting */ 129b7475eb5SThomas Gleixner #if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT) 130b7475eb5SThomas Gleixner extern void tick_broadcast_switch_to_oneshot(void); 131a49b116dSThomas Gleixner extern void tick_shutdown_broadcast_oneshot(unsigned int cpu); 132b7475eb5SThomas Gleixner extern int tick_broadcast_oneshot_active(void); 133b7475eb5SThomas Gleixner extern void tick_check_oneshot_broadcast_this_cpu(void); 134b7475eb5SThomas Gleixner bool tick_broadcast_oneshot_available(void); 135c1797bafSThomas Gleixner extern struct cpumask *tick_get_broadcast_oneshot_mask(void); 1363ae7a939SIngo Molnar #else /* !(BROADCAST && ONESHOT): */ 137b7475eb5SThomas Gleixner static inline void tick_broadcast_switch_to_oneshot(void) { } 138a49b116dSThomas Gleixner static inline void tick_shutdown_broadcast_oneshot(unsigned int cpu) { } 139b7475eb5SThomas Gleixner static inline int tick_broadcast_oneshot_active(void) { return 0; } 140b7475eb5SThomas Gleixner static inline void tick_check_oneshot_broadcast_this_cpu(void) { } 141b7475eb5SThomas Gleixner static inline bool tick_broadcast_oneshot_available(void) { return tick_oneshot_possible(); } 1423ae7a939SIngo Molnar #endif /* !(BROADCAST && ONESHOT) */ 143e2830b5cSTorben Hohn 144b7475eb5SThomas Gleixner /* NO_HZ_FULL internal */ 145b7475eb5SThomas Gleixner #ifdef CONFIG_NO_HZ_FULL 146b7475eb5SThomas Gleixner extern void tick_nohz_init(void); 147b7475eb5SThomas Gleixner # else 148b7475eb5SThomas Gleixner static inline void tick_nohz_init(void) { } 149b7475eb5SThomas Gleixner #endif 150c1ad348bSThomas Gleixner 151bc7a34b8SThomas Gleixner #ifdef CONFIG_NO_HZ_COMMON 152bc7a34b8SThomas Gleixner extern unsigned long tick_nohz_active; 153bc7a34b8SThomas Gleixner #else 154bc7a34b8SThomas Gleixner #define tick_nohz_active (0) 155bc7a34b8SThomas Gleixner #endif 156bc7a34b8SThomas Gleixner 157bc7a34b8SThomas Gleixner #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON) 158683be13aSThomas Gleixner extern void timers_update_migration(bool update_nohz); 159bc7a34b8SThomas Gleixner #else 160683be13aSThomas Gleixner static inline void timers_update_migration(bool update_nohz) { } 161bc7a34b8SThomas Gleixner #endif 162bc7a34b8SThomas Gleixner 163bc7a34b8SThomas Gleixner DECLARE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases); 164bc7a34b8SThomas Gleixner 165c1ad348bSThomas Gleixner extern u64 get_next_timer_interrupt(unsigned long basej, u64 basem); 166a683f390SThomas Gleixner void timer_clear_idle(void); 167