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 # else /* BROADCAST */
  40 static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
  41 {
  42         BUG();
  43 }
  44 static inline void tick_broadcast_oneshot_control(unsigned long reason) { }
  45 static inline void tick_broadcast_switch_to_oneshot(void) { }
  46 static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
  47 static inline int tick_broadcast_oneshot_active(void) { return 0; }
  48 static inline void tick_check_oneshot_broadcast(int cpu) { }
  49 # endif /* !BROADCAST */
  50
  51 #else /* !ONESHOT */
  52 static inline
  53 void tick_setup_oneshot(struct clock_event_device *newdev,
  54                         void (*handler)(struct clock_event_device *),
  55                         ktime_t nextevt)
  56 {
  57         BUG();
  58 }
  59 static inline void tick_resume_oneshot(void)
  60 {
  61         BUG();
  62 }
  63 static inline int tick_program_event(ktime_t expires, int force)
  64 {
  65         return 0;
  66 }
  67 static inline void tick_oneshot_notify(void) { }
  68 static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
  69 {
  70         BUG();
  71 }
  72 static inline void tick_broadcast_oneshot_control(unsigned long reason) { }
  73 static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
  74 static inline int tick_resume_broadcast_oneshot(struct clock_event_device *bc)
  75 {
  76         return 0;
  77 }
  78 static inline int tick_broadcast_oneshot_active(void) { return 0; }
  79 #endif /* !TICK_ONESHOT */
  80
  81 /*
  82  * Broadcasting support
  83  */
  84 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
  85 extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu);
  86 extern int tick_check_broadcast_device(struct clock_event_device *dev);
  87 extern int tick_is_broadcast_device(struct clock_event_device *dev);
  88 extern void tick_broadcast_on_off(unsigned long reason, int *oncpu);
  89 extern void tick_shutdown_broadcast(unsigned int *cpup);
  90 extern void tick_suspend_broadcast(void);
  91 extern int tick_resume_broadcast(void);
  92
  93 extern void
  94 tick_set_periodic_handler(struct clock_event_device *dev, int broadcast);
  95
  96 #else /* !BROADCAST */
  97
  98 static inline int tick_check_broadcast_device(struct clock_event_device *dev)
  99 {
 100         return 0;
 101 }
 102
 103 static inline int tick_is_broadcast_device(struct clock_event_device *dev)
 104 {
 105         return 0;
 106 }
 107 static inline int tick_device_uses_broadcast(struct clock_event_device *dev,
 108                                              int cpu)
 109 {
 110         return 0;
 111 }
 112 static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { }
 113 static inline void tick_broadcast_on_off(unsigned long reason, int *oncpu) { }
 114 static inline void tick_shutdown_broadcast(unsigned int *cpup) { }
 115 static inline void tick_suspend_broadcast(void) { }
 116 static inline int tick_resume_broadcast(void) { return 0; }
 117
 118 /*
 119  * Set the periodic handler in non broadcast mode
 120  */
 121 static inline void tick_set_periodic_handler(struct clock_event_device *dev,
 122                                              int broadcast)
 123 {
 124         dev->event_handler = tick_handle_periodic;
 125 }
 126 #endif /* !BROADCAST */
 127
 128 /*
 129  * Check, if the device is functional or a dummy for broadcast
 130  */
 131 static inline int tick_device_is_functional(struct clock_event_device *dev)
 132 {
 133         return !(dev->features & CLOCK_EVT_FEAT_DUMMY);
 134 }