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