kernel/time/tick-internal.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * tick internal variable and functions used by low/high res code
   4  */
   5 #include <linux/hrtimer.h>
   6 #include <linux/tick.h>
   7
   8 #include "timekeeping.h"
   9 #include "tick-sched.h"
  10
  11 #ifdef CONFIG_GENERIC_CLOCKEVENTS
  12
  13 # define TICK_DO_TIMER_NONE     -1
  14 # define TICK_DO_TIMER_BOOT     -2
  15
  16 DECLARE_PER_CPU(struct tick_device, tick_cpu_device);
  17 extern ktime_t tick_next_period;
  18 extern ktime_t tick_period;
  19 extern int tick_do_timer_cpu __read_mostly;
  20
  21 extern void tick_setup_periodic(struct clock_event_device *dev, int broadcast);
  22 extern void tick_handle_periodic(struct clock_event_device *dev);
  23 extern void tick_check_new_device(struct clock_event_device *dev);
  24 extern void tick_shutdown(unsigned int cpu);
  25 extern void tick_suspend(void);
  26 extern void tick_resume(void);
  27 extern bool tick_check_replacement(struct clock_event_device *curdev,
  28                                    struct clock_event_device *newdev);
  29 extern void tick_install_replacement(struct clock_event_device *dev);
  30 extern int tick_is_oneshot_available(void);
  31 extern struct tick_device *tick_get_device(int cpu);
  32
  33 extern int clockevents_tick_resume(struct clock_event_device *dev);
  34 /* Check, if the device is functional or a dummy for broadcast */
  35 static inline int tick_device_is_functional(struct clock_event_device *dev)
  36 {
  37         return !(dev->features & CLOCK_EVT_FEAT_DUMMY);
  38 }
  39
  40 static inline enum clock_event_state clockevent_get_state(struct clock_event_device *dev)
  41 {
  42         return dev->state_use_accessors;
  43 }
  44
  45 static inline void clockevent_set_state(struct clock_event_device *dev,
  46                                         enum clock_event_state state)
  47 {
  48         dev->state_use_accessors = state;
  49 }
  50
  51 extern void clockevents_shutdown(struct clock_event_device *dev);
  52 extern void clockevents_exchange_device(struct clock_event_device *old,
  53                                         struct clock_event_device *new);
  54 extern void clockevents_switch_state(struct clock_event_device *dev,
  55                                      enum clock_event_state state);
  56 extern int clockevents_program_event(struct clock_event_device *dev,
  57                                      ktime_t expires, bool force);
  58 extern void clockevents_handle_noop(struct clock_event_device *dev);
  59 extern int __clockevents_update_freq(struct clock_event_device *dev, u32 freq);
  60 extern ssize_t sysfs_get_uname(const char *buf, char *dst, size_t cnt);
  61
  62 /* Broadcasting support */
  63 # ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
  64 extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu);
  65 extern void tick_install_broadcast_device(struct clock_event_device *dev);
  66 extern int tick_is_broadcast_device(struct clock_event_device *dev);
  67 extern void tick_shutdown_broadcast(unsigned int cpu);
  68 extern void tick_suspend_broadcast(void);
  69 extern void tick_resume_broadcast(void);
  70 extern bool tick_resume_check_broadcast(void);
  71 extern void tick_broadcast_init(void);
  72 extern void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast);
  73 extern int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq);
  74 extern struct tick_device *tick_get_broadcast_device(void);
  75 extern struct cpumask *tick_get_broadcast_mask(void);
  76 # else /* !CONFIG_GENERIC_CLOCKEVENTS_BROADCAST: */
  77 static inline void tick_install_broadcast_device(struct clock_event_device *dev) { }
  78 static inline int tick_is_broadcast_device(struct clock_event_device *dev) { return 0; }
  79 static inline int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu) { return 0; }
  80 static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { }
  81 static inline void tick_shutdown_broadcast(unsigned int cpu) { }
  82 static inline void tick_suspend_broadcast(void) { }
  83 static inline void tick_resume_broadcast(void) { }
  84 static inline bool tick_resume_check_broadcast(void) { return false; }
  85 static inline void tick_broadcast_init(void) { }
  86 static inline int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq) { return -ENODEV; }
  87
  88 /* Set the periodic handler in non broadcast mode */
  89 static inline void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast)
  90 {
  91         dev->event_handler = tick_handle_periodic;
  92 }
  93 # endif /* !CONFIG_GENERIC_CLOCKEVENTS_BROADCAST */
  94
  95 #else /* !GENERIC_CLOCKEVENTS: */
  96 static inline void tick_suspend(void) { }
  97 static inline void tick_resume(void) { }
  98 #endif /* !GENERIC_CLOCKEVENTS */
  99
 100 /* Oneshot related functions */
 101 #ifdef CONFIG_TICK_ONESHOT
 102 extern void tick_setup_oneshot(struct clock_event_device *newdev,
 103                                void (*handler)(struct clock_event_device *),
 104                                ktime_t nextevt);
 105 extern int tick_program_event(ktime_t expires, int force);
 106 extern void tick_oneshot_notify(void);
 107 extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *));
 108 extern void tick_resume_oneshot(void);
 109 static inline bool tick_oneshot_possible(void) { return true; }
 110 extern int tick_oneshot_mode_active(void);
 111 extern void tick_clock_notify(void);
 112 extern int tick_check_oneshot_change(int allow_nohz);
 113 extern int tick_init_highres(void);
 114 #else /* !CONFIG_TICK_ONESHOT: */
 115 static inline
 116 void tick_setup_oneshot(struct clock_event_device *newdev,
 117                         void (*handler)(struct clock_event_device *),
 118                         ktime_t nextevt) { BUG(); }
 119 static inline void tick_resume_oneshot(void) { BUG(); }
 120 static inline int tick_program_event(ktime_t expires, int force) { return 0; }
 121 static inline void tick_oneshot_notify(void) { }
 122 static inline bool tick_oneshot_possible(void) { return false; }
 123 static inline int tick_oneshot_mode_active(void) { return 0; }
 124 static inline void tick_clock_notify(void) { }
 125 static inline int tick_check_oneshot_change(int allow_nohz) { return 0; }
 126 #endif /* !CONFIG_TICK_ONESHOT */
 127
 128 /* Functions related to oneshot broadcasting */
 129 #if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT)
 130 extern void tick_broadcast_switch_to_oneshot(void);
 131 extern void tick_shutdown_broadcast_oneshot(unsigned int cpu);
 132 extern int tick_broadcast_oneshot_active(void);
 133 extern void tick_check_oneshot_broadcast_this_cpu(void);
 134 bool tick_broadcast_oneshot_available(void);
 135 extern struct cpumask *tick_get_broadcast_oneshot_mask(void);
 136 #else /* !(BROADCAST && ONESHOT): */
 137 static inline void tick_broadcast_switch_to_oneshot(void) { }
 138 static inline void tick_shutdown_broadcast_oneshot(unsigned int cpu) { }
 139 static inline int tick_broadcast_oneshot_active(void) { return 0; }
 140 static inline void tick_check_oneshot_broadcast_this_cpu(void) { }
 141 static inline bool tick_broadcast_oneshot_available(void) { return tick_oneshot_possible(); }
 142 #endif /* !(BROADCAST && ONESHOT) */
 143
 144 /* NO_HZ_FULL internal */
 145 #ifdef CONFIG_NO_HZ_FULL
 146 extern void tick_nohz_init(void);
 147 # else
 148 static inline void tick_nohz_init(void) { }
 149 #endif
 150
 151 #ifdef CONFIG_NO_HZ_COMMON
 152 extern unsigned long tick_nohz_active;
 153 extern void timers_update_nohz(void);
 154 # ifdef CONFIG_SMP
 155 extern struct static_key_false timers_migration_enabled;
 156 # endif
 157 #else /* CONFIG_NO_HZ_COMMON */
 158 static inline void timers_update_nohz(void) { }
 159 #define tick_nohz_active (0)
 160 #endif
 161
 162 DECLARE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases);
 163
 164 extern u64 get_next_timer_interrupt(unsigned long basej, u64 basem);
 165 void timer_clear_idle(void);