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 extern void clockevents_shutdown(struct clock_event_device *dev);
  14
  15 /*
  16  * NO_HZ / high resolution timer shared code
  17  */
  18 #ifdef CONFIG_TICK_ONESHOT
  19 extern void tick_setup_oneshot(struct clock_event_device *newdev,
  20                                void (*handler)(struct clock_event_device *),
  21                                ktime_t nextevt);
  22 extern int tick_dev_program_event(struct clock_event_device *dev,
  23                                   ktime_t expires, int force);
  24 extern int tick_program_event(ktime_t expires, int force);
  25 extern void tick_oneshot_notify(void);
  26 extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *));
  27 extern void tick_resume_oneshot(void);
  28 # ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
  29 extern void tick_broadcast_setup_oneshot(struct clock_event_device *bc);
  30 extern void tick_broadcast_oneshot_control(unsigned long reason);
  31 extern void tick_broadcast_switch_to_oneshot(void);
  32 extern void tick_shutdown_broadcast_oneshot(unsigned int *cpup);
  33 extern int tick_resume_broadcast_oneshot(struct clock_event_device *bc);
  34 # else /* BROADCAST */
  35 static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
  36 {
  37         BUG();
  38 }
  39 static inline void tick_broadcast_oneshot_control(unsigned long reason) { }
  40 static inline void tick_broadcast_switch_to_oneshot(void) { }
  41 static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
  42 # endif /* !BROADCAST */
  43
  44 #else /* !ONESHOT */
  45 static inline
  46 void tick_setup_oneshot(struct clock_event_device *newdev,
  47                         void (*handler)(struct clock_event_device *),
  48                         ktime_t nextevt)
  49 {
  50         BUG();
  51 }
  52 static inline void tick_resume_oneshot(void)
  53 {
  54         BUG();
  55 }
  56 static inline int tick_program_event(ktime_t expires, int force)
  57 {
  58         return 0;
  59 }
  60 static inline void tick_oneshot_notify(void) { }
  61 static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
  62 {
  63         BUG();
  64 }
  65 static inline void tick_broadcast_oneshot_control(unsigned long reason) { }
  66 static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
  67 static inline int tick_resume_broadcast_oneshot(struct clock_event_device *bc)
  68 {
  69         return 0;
  70 }
  71 #endif /* !TICK_ONESHOT */
  72
  73 /*
  74  * Broadcasting support
  75  */
  76 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
  77 extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu);
  78 extern int tick_check_broadcast_device(struct clock_event_device *dev);
  79 extern int tick_is_broadcast_device(struct clock_event_device *dev);
  80 extern void tick_broadcast_on_off(unsigned long reason, int *oncpu);
  81 extern void tick_shutdown_broadcast(unsigned int *cpup);
  82 extern void tick_suspend_broadcast(void);
  83 extern int tick_resume_broadcast(void);
  84
  85 extern void
  86 tick_set_periodic_handler(struct clock_event_device *dev, int broadcast);
  87
  88 #else /* !BROADCAST */
  89
  90 static inline int tick_check_broadcast_device(struct clock_event_device *dev)
  91 {
  92         return 0;
  93 }
  94
  95 static inline int tick_is_broadcast_device(struct clock_event_device *dev)
  96 {
  97         return 0;
  98 }
  99 static inline int tick_device_uses_broadcast(struct clock_event_device *dev,
 100                                              int cpu)
 101 {
 102         return 0;
 103 }
 104 static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { }
 105 static inline void tick_broadcast_on_off(unsigned long reason, int *oncpu) { }
 106 static inline void tick_shutdown_broadcast(unsigned int *cpup) { }
 107 static inline void tick_suspend_broadcast(void) { }
 108 static inline int tick_resume_broadcast(void) { return 0; }
 109
 110 /*
 111  * Set the periodic handler in non broadcast mode
 112  */
 113 static inline void tick_set_periodic_handler(struct clock_event_device *dev,
 114                                              int broadcast)
 115 {
 116         dev->event_handler = tick_handle_periodic;
 117 }
 118 #endif /* !BROADCAST */
 119
 120 /*
 121  * Check, if the device is functional or a dummy for broadcast
 122  */
 123 static inline int tick_device_is_functional(struct clock_event_device *dev)
 124 {
 125         return !(dev->features & CLOCK_EVT_FEAT_DUMMY);
 126 }