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