kernel/time/tick-internal.h

   1 /*
   2  * tick internal variable and functions used by low/high res code
   3  */
   4
   5 #define TICK_DO_TIMER_NONE      -1
   6 #define TICK_DO_TIMER_BOOT      -2
   7
   8 DECLARE_PER_CPU(struct tick_device, tick_cpu_device);
   9 extern spinlock_t tick_device_lock;
  10 extern ktime_t tick_next_period;
  11 extern ktime_t tick_period;
  12 extern int tick_do_timer_cpu __read_mostly;
  13
  14 extern void tick_setup_periodic(struct clock_event_device *dev, int broadcast);
  15 extern void tick_handle_periodic(struct clock_event_device *dev);
  16
  17 extern void clockevents_shutdown(struct clock_event_device *dev);
  18
  19 /*
  20  * NO_HZ / high resolution timer shared code
  21  */
  22 #ifdef CONFIG_TICK_ONESHOT
  23 extern void tick_setup_oneshot(struct clock_event_device *newdev,
  24                                void (*handler)(struct clock_event_device *),
  25                                ktime_t nextevt);
  26 extern int tick_dev_program_event(struct clock_event_device *dev,
  27                                   ktime_t expires, int force);
  28 extern int tick_program_event(ktime_t expires, int force);
  29 extern void tick_oneshot_notify(void);
  30 extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *));
  31 extern void tick_resume_oneshot(void);
  32 # ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
  33 extern void tick_broadcast_setup_oneshot(struct clock_event_device *bc);
  34 extern void tick_broadcast_oneshot_control(unsigned long reason);
  35 extern void tick_broadcast_switch_to_oneshot(void);
  36 extern void tick_shutdown_broadcast_oneshot(unsigned int *cpup);
  37 extern int tick_resume_broadcast_oneshot(struct clock_event_device *bc);
  38 extern int tick_broadcast_oneshot_active(void);
  39 extern void tick_check_oneshot_broadcast(int cpu);
  40 bool tick_broadcast_oneshot_available(void);
  41 # else /* BROADCAST */
  42 static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
  43 {
  44         BUG();
  45 }
  46 static inline void tick_broadcast_oneshot_control(unsigned long reason) { }
  47 static inline void tick_broadcast_switch_to_oneshot(void) { }
  48 static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
  49 static inline int tick_broadcast_oneshot_active(void) { return 0; }
  50 static inline void tick_check_oneshot_broadcast(int cpu) { }
  51 static inline bool tick_broadcast_oneshot_available(void) { return true; }
  52 # endif /* !BROADCAST */
  53
  54 #else /* !ONESHOT */
  55 static inline
  56 void tick_setup_oneshot(struct clock_event_device *newdev,
  57                         void (*handler)(struct clock_event_device *),
  58                         ktime_t nextevt)
  59 {
  60         BUG();
  61 }
  62 static inline void tick_resume_oneshot(void)
  63 {
  64         BUG();
  65 }
  66 static inline int tick_program_event(ktime_t expires, int force)
  67 {
  68         return 0;
  69 }
  70 static inline void tick_oneshot_notify(void) { }
  71 static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
  72 {
  73         BUG();
  74 }
  75 static inline void tick_broadcast_oneshot_control(unsigned long reason) { }
  76 static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
  77 static inline int tick_resume_broadcast_oneshot(struct clock_event_device *bc)
  78 {
  79         return 0;
  80 }
  81 static inline int tick_broadcast_oneshot_active(void) { return 0; }
  82 static inline bool tick_broadcast_oneshot_available(void) { return false; }
  83 #endif /* !TICK_ONESHOT */
  84
  85 /*
  86  * Broadcasting support
  87  */
  88 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
  89 extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu);
  90 extern int tick_check_broadcast_device(struct clock_event_device *dev);
  91 extern int tick_is_broadcast_device(struct clock_event_device *dev);
  92 extern void tick_broadcast_on_off(unsigned long reason, int *oncpu);
  93 extern void tick_shutdown_broadcast(unsigned int *cpup);
  94 extern void tick_suspend_broadcast(void);
  95 extern int tick_resume_broadcast(void);
  96
  97 extern void
  98 tick_set_periodic_handler(struct clock_event_device *dev, int broadcast);
  99
 100 #else /* !BROADCAST */
 101
 102 static inline int tick_check_broadcast_device(struct clock_event_device *dev)
 103 {
 104         return 0;
 105 }
 106
 107 static inline int tick_is_broadcast_device(struct clock_event_device *dev)
 108 {
 109         return 0;
 110 }
 111 static inline int tick_device_uses_broadcast(struct clock_event_device *dev,
 112                                              int cpu)
 113 {
 114         return 0;
 115 }
 116 static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { }
 117 static inline void tick_broadcast_on_off(unsigned long reason, int *oncpu) { }
 118 static inline void tick_shutdown_broadcast(unsigned int *cpup) { }
 119 static inline void tick_suspend_broadcast(void) { }
 120 static inline int tick_resume_broadcast(void) { return 0; }
 121
 122 /*
 123  * Set the periodic handler in non broadcast mode
 124  */
 125 static inline void tick_set_periodic_handler(struct clock_event_device *dev,
 126                                              int broadcast)
 127 {
 128         dev->event_handler = tick_handle_periodic;
 129 }
 130 #endif /* !BROADCAST */
 131
 132 /*
 133  * Check, if the device is functional or a dummy for broadcast
 134  */
 135 static inline int tick_device_is_functional(struct clock_event_device *dev)
 136 {
 137         return !(dev->features & CLOCK_EVT_FEAT_DUMMY);
 138 }