kernel/time/tick-internal.h

   1 /*
   2  * tick internal variable and functions used by low/high res code
   3  */
   4 #include <linux/hrtimer.h>
   5 #include <linux/tick.h>
   6
   7 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BUILD
   8
   9 #define TICK_DO_TIMER_NONE      -1
  10 #define TICK_DO_TIMER_BOOT      -2
  11
  12 DECLARE_PER_CPU(struct tick_device, tick_cpu_device);
  13 extern ktime_t tick_next_period;
  14 extern ktime_t tick_period;
  15 extern int tick_do_timer_cpu __read_mostly;
  16
  17 extern void tick_setup_periodic(struct clock_event_device *dev, int broadcast);
  18 extern void tick_handle_periodic(struct clock_event_device *dev);
  19
  20 extern void clockevents_shutdown(struct clock_event_device *dev);
  21
  22 /*
  23  * NO_HZ / high resolution timer shared code
  24  */
  25 #ifdef CONFIG_TICK_ONESHOT
  26 extern void tick_setup_oneshot(struct clock_event_device *newdev,
  27                                void (*handler)(struct clock_event_device *),
  28                                ktime_t nextevt);
  29 extern int tick_program_event(ktime_t expires, int force);
  30 extern void tick_oneshot_notify(void);
  31 extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *));
  32 extern void tick_resume_oneshot(void);
  33 # ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
  34 extern void tick_broadcast_setup_oneshot(struct clock_event_device *bc);
  35 extern void tick_broadcast_oneshot_control(unsigned long reason);
  36 extern void tick_broadcast_switch_to_oneshot(void);
  37 extern void tick_shutdown_broadcast_oneshot(unsigned int *cpup);
  38 extern int tick_resume_broadcast_oneshot(struct clock_event_device *bc);
  39 extern int tick_broadcast_oneshot_active(void);
  40 extern void tick_check_oneshot_broadcast(int cpu);
  41 bool tick_broadcast_oneshot_available(void);
  42 # else /* BROADCAST */
  43 static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
  44 {
  45         BUG();
  46 }
  47 static inline void tick_broadcast_oneshot_control(unsigned long reason) { }
  48 static inline void tick_broadcast_switch_to_oneshot(void) { }
  49 static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
  50 static inline int tick_broadcast_oneshot_active(void) { return 0; }
  51 static inline void tick_check_oneshot_broadcast(int cpu) { }
  52 static inline bool tick_broadcast_oneshot_available(void) { return true; }
  53 # endif /* !BROADCAST */
  54
  55 #else /* !ONESHOT */
  56 static inline
  57 void tick_setup_oneshot(struct clock_event_device *newdev,
  58                         void (*handler)(struct clock_event_device *),
  59                         ktime_t nextevt)
  60 {
  61         BUG();
  62 }
  63 static inline void tick_resume_oneshot(void)
  64 {
  65         BUG();
  66 }
  67 static inline int tick_program_event(ktime_t expires, int force)
  68 {
  69         return 0;
  70 }
  71 static inline void tick_oneshot_notify(void) { }
  72 static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
  73 {
  74         BUG();
  75 }
  76 static inline void tick_broadcast_oneshot_control(unsigned long reason) { }
  77 static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
  78 static inline int tick_resume_broadcast_oneshot(struct clock_event_device *bc)
  79 {
  80         return 0;
  81 }
  82 static inline int tick_broadcast_oneshot_active(void) { return 0; }
  83 static inline bool tick_broadcast_oneshot_available(void) { return false; }
  84 #endif /* !TICK_ONESHOT */
  85
  86 /*
  87  * Broadcasting support
  88  */
  89 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
  90 extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu);
  91 extern int tick_check_broadcast_device(struct clock_event_device *dev);
  92 extern int tick_is_broadcast_device(struct clock_event_device *dev);
  93 extern void tick_broadcast_on_off(unsigned long reason, int *oncpu);
  94 extern void tick_shutdown_broadcast(unsigned int *cpup);
  95 extern void tick_suspend_broadcast(void);
  96 extern int tick_resume_broadcast(void);
  97
  98 extern void
  99 tick_set_periodic_handler(struct clock_event_device *dev, int broadcast);
 100
 101 #else /* !BROADCAST */
 102
 103 static inline int tick_check_broadcast_device(struct clock_event_device *dev)
 104 {
 105         return 0;
 106 }
 107
 108 static inline int tick_is_broadcast_device(struct clock_event_device *dev)
 109 {
 110         return 0;
 111 }
 112 static inline int tick_device_uses_broadcast(struct clock_event_device *dev,
 113                                              int cpu)
 114 {
 115         return 0;
 116 }
 117 static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { }
 118 static inline void tick_broadcast_on_off(unsigned long reason, int *oncpu) { }
 119 static inline void tick_shutdown_broadcast(unsigned int *cpup) { }
 120 static inline void tick_suspend_broadcast(void) { }
 121 static inline int tick_resume_broadcast(void) { return 0; }
 122
 123 /*
 124  * Set the periodic handler in non broadcast mode
 125  */
 126 static inline void tick_set_periodic_handler(struct clock_event_device *dev,
 127                                              int broadcast)
 128 {
 129         dev->event_handler = tick_handle_periodic;
 130 }
 131 #endif /* !BROADCAST */
 132
 133 /*
 134  * Check, if the device is functional or a dummy for broadcast
 135  */
 136 static inline int tick_device_is_functional(struct clock_event_device *dev)
 137 {
 138         return !(dev->features & CLOCK_EVT_FEAT_DUMMY);
 139 }
 140
 141 #endif
 142
 143 extern void do_timer(unsigned long ticks);
 144 extern seqlock_t xtime_lock;