kernel/time/tick-internal.h

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