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