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_dev_program_event(struct clock_event_device *dev,
  30                                   ktime_t expires, int force);
  31 extern int tick_program_event(ktime_t expires, int force);
  32 extern void tick_oneshot_notify(void);
  33 extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *));
  34 extern void tick_resume_oneshot(void);
  35 # ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
  36 extern void tick_broadcast_setup_oneshot(struct clock_event_device *bc);
  37 extern void tick_broadcast_oneshot_control(unsigned long reason);
  38 extern void tick_broadcast_switch_to_oneshot(void);
  39 extern void tick_shutdown_broadcast_oneshot(unsigned int *cpup);
  40 extern int tick_resume_broadcast_oneshot(struct clock_event_device *bc);
  41 extern int tick_broadcast_oneshot_active(void);
  42 extern void tick_check_oneshot_broadcast(int cpu);
  43 bool tick_broadcast_oneshot_available(void);
  44 # else /* BROADCAST */
  45 static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
  46 {
  47         BUG();
  48 }
  49 static inline void tick_broadcast_oneshot_control(unsigned long reason) { }
  50 static inline void tick_broadcast_switch_to_oneshot(void) { }
  51 static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
  52 static inline int tick_broadcast_oneshot_active(void) { return 0; }
  53 static inline void tick_check_oneshot_broadcast(int cpu) { }
  54 static inline bool tick_broadcast_oneshot_available(void) { return true; }
  55 # endif /* !BROADCAST */
  56
  57 #else /* !ONESHOT */
  58 static inline
  59 void tick_setup_oneshot(struct clock_event_device *newdev,
  60                         void (*handler)(struct clock_event_device *),
  61                         ktime_t nextevt)
  62 {
  63         BUG();
  64 }
  65 static inline void tick_resume_oneshot(void)
  66 {
  67         BUG();
  68 }
  69 static inline int tick_program_event(ktime_t expires, int force)
  70 {
  71         return 0;
  72 }
  73 static inline void tick_oneshot_notify(void) { }
  74 static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
  75 {
  76         BUG();
  77 }
  78 static inline void tick_broadcast_oneshot_control(unsigned long reason) { }
  79 static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
  80 static inline int tick_resume_broadcast_oneshot(struct clock_event_device *bc)
  81 {
  82         return 0;
  83 }
  84 static inline int tick_broadcast_oneshot_active(void) { return 0; }
  85 static inline bool tick_broadcast_oneshot_available(void) { return false; }
  86 #endif /* !TICK_ONESHOT */
  87
  88 /*
  89  * Broadcasting support
  90  */
  91 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
  92 extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu);
  93 extern int tick_check_broadcast_device(struct clock_event_device *dev);
  94 extern int tick_is_broadcast_device(struct clock_event_device *dev);
  95 extern void tick_broadcast_on_off(unsigned long reason, int *oncpu);
  96 extern void tick_shutdown_broadcast(unsigned int *cpup);
  97 extern void tick_suspend_broadcast(void);
  98 extern int tick_resume_broadcast(void);
  99
 100 extern void
 101 tick_set_periodic_handler(struct clock_event_device *dev, int broadcast);
 102
 103 #else /* !BROADCAST */
 104
 105 static inline int tick_check_broadcast_device(struct clock_event_device *dev)
 106 {
 107         return 0;
 108 }
 109
 110 static inline int tick_is_broadcast_device(struct clock_event_device *dev)
 111 {
 112         return 0;
 113 }
 114 static inline int tick_device_uses_broadcast(struct clock_event_device *dev,
 115                                              int cpu)
 116 {
 117         return 0;
 118 }
 119 static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { }
 120 static inline void tick_broadcast_on_off(unsigned long reason, int *oncpu) { }
 121 static inline void tick_shutdown_broadcast(unsigned int *cpup) { }
 122 static inline void tick_suspend_broadcast(void) { }
 123 static inline int tick_resume_broadcast(void) { return 0; }
 124
 125 /*
 126  * Set the periodic handler in non broadcast mode
 127  */
 128 static inline void tick_set_periodic_handler(struct clock_event_device *dev,
 129                                              int broadcast)
 130 {
 131         dev->event_handler = tick_handle_periodic;
 132 }
 133 #endif /* !BROADCAST */
 134
 135 /*
 136  * Check, if the device is functional or a dummy for broadcast
 137  */
 138 static inline int tick_device_is_functional(struct clock_event_device *dev)
 139 {
 140         return !(dev->features & CLOCK_EVT_FEAT_DUMMY);
 141 }
 142
 143 #endif
 144
 145 extern void do_timer(unsigned long ticks);
 146 extern seqlock_t xtime_lock;