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 #include "timekeeping.h"
   8
   9 extern seqlock_t jiffies_lock;
  10
  11 #define CS_NAME_LEN     32
  12
  13 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BUILD
  14
  15 #define TICK_DO_TIMER_NONE      -1
  16 #define TICK_DO_TIMER_BOOT      -2
  17
  18 DECLARE_PER_CPU(struct tick_device, tick_cpu_device);
  19 extern ktime_t tick_next_period;
  20 extern ktime_t tick_period;
  21 extern int tick_do_timer_cpu __read_mostly;
  22
  23 extern void tick_setup_periodic(struct clock_event_device *dev, int broadcast);
  24 extern void tick_handle_periodic(struct clock_event_device *dev);
  25 extern void tick_check_new_device(struct clock_event_device *dev);
  26 extern void tick_handover_do_timer(int *cpup);
  27 extern void tick_shutdown(unsigned int *cpup);
  28 extern void tick_suspend(void);
  29 extern void tick_resume(void);
  30 extern bool tick_check_replacement(struct clock_event_device *curdev,
  31                                    struct clock_event_device *newdev);
  32 extern void tick_install_replacement(struct clock_event_device *dev);
  33
  34 extern void clockevents_shutdown(struct clock_event_device *dev);
  35 extern int clockevents_tick_resume(struct clock_event_device *dev);
  36
  37 extern ssize_t sysfs_get_uname(const char *buf, char *dst, size_t cnt);
  38
  39 /*
  40  * NO_HZ / high resolution timer shared code
  41  */
  42 #ifdef CONFIG_TICK_ONESHOT
  43 extern void tick_setup_oneshot(struct clock_event_device *newdev,
  44                                void (*handler)(struct clock_event_device *),
  45                                ktime_t nextevt);
  46 extern int tick_program_event(ktime_t expires, int force);
  47 extern void tick_oneshot_notify(void);
  48 extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *));
  49 extern void tick_resume_oneshot(void);
  50 # ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
  51 extern void tick_broadcast_setup_oneshot(struct clock_event_device *bc);
  52 extern int tick_broadcast_oneshot_control(unsigned long reason);
  53 extern void tick_broadcast_switch_to_oneshot(void);
  54 extern void tick_shutdown_broadcast_oneshot(unsigned int *cpup);
  55 extern int tick_resume_broadcast_oneshot(struct clock_event_device *bc);
  56 extern int tick_broadcast_oneshot_active(void);
  57 extern void tick_check_oneshot_broadcast_this_cpu(void);
  58 bool tick_broadcast_oneshot_available(void);
  59 # else /* BROADCAST */
  60 static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
  61 {
  62         BUG();
  63 }
  64 static inline int tick_broadcast_oneshot_control(unsigned long reason) { return 0; }
  65 static inline void tick_broadcast_switch_to_oneshot(void) { }
  66 static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
  67 static inline int tick_broadcast_oneshot_active(void) { return 0; }
  68 static inline void tick_check_oneshot_broadcast_this_cpu(void) { }
  69 static inline bool tick_broadcast_oneshot_available(void) { return true; }
  70 # endif /* !BROADCAST */
  71
  72 #else /* !ONESHOT */
  73 static inline
  74 void tick_setup_oneshot(struct clock_event_device *newdev,
  75                         void (*handler)(struct clock_event_device *),
  76                         ktime_t nextevt)
  77 {
  78         BUG();
  79 }
  80 static inline void tick_resume_oneshot(void)
  81 {
  82         BUG();
  83 }
  84 static inline int tick_program_event(ktime_t expires, int force)
  85 {
  86         return 0;
  87 }
  88 static inline void tick_oneshot_notify(void) { }
  89 static inline void tick_broadcast_setup_oneshot(struct clock_event_device *bc)
  90 {
  91         BUG();
  92 }
  93 static inline int tick_broadcast_oneshot_control(unsigned long reason) { return 0; }
  94 static inline void tick_shutdown_broadcast_oneshot(unsigned int *cpup) { }
  95 static inline int tick_resume_broadcast_oneshot(struct clock_event_device *bc)
  96 {
  97         return 0;
  98 }
  99 static inline int tick_broadcast_oneshot_active(void) { return 0; }
 100 static inline bool tick_broadcast_oneshot_available(void) { return false; }
 101 #endif /* !TICK_ONESHOT */
 102
 103 /* NO_HZ_FULL internal */
 104 #ifdef CONFIG_NO_HZ_FULL
 105 extern void tick_nohz_init(void);
 106 # else
 107 static inline void tick_nohz_init(void) { }
 108 #endif
 109
 110 /*
 111  * Broadcasting support
 112  */
 113 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
 114 extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu);
 115 extern void tick_install_broadcast_device(struct clock_event_device *dev);
 116 extern int tick_is_broadcast_device(struct clock_event_device *dev);
 117 extern void tick_broadcast_on_off(unsigned long reason, int *oncpu);
 118 extern void tick_shutdown_broadcast(unsigned int *cpup);
 119 extern void tick_suspend_broadcast(void);
 120 extern int tick_resume_broadcast(void);
 121 extern void tick_broadcast_init(void);
 122 extern void
 123 tick_set_periodic_handler(struct clock_event_device *dev, int broadcast);
 124 int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq);
 125
 126 #else /* !BROADCAST */
 127
 128 static inline void tick_install_broadcast_device(struct clock_event_device *dev)
 129 {
 130 }
 131
 132 static inline int tick_is_broadcast_device(struct clock_event_device *dev)
 133 {
 134         return 0;
 135 }
 136 static inline int tick_device_uses_broadcast(struct clock_event_device *dev,
 137                                              int cpu)
 138 {
 139         return 0;
 140 }
 141 static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { }
 142 static inline void tick_broadcast_on_off(unsigned long reason, int *oncpu) { }
 143 static inline void tick_shutdown_broadcast(unsigned int *cpup) { }
 144 static inline void tick_suspend_broadcast(void) { }
 145 static inline int tick_resume_broadcast(void) { return 0; }
 146 static inline void tick_broadcast_init(void) { }
 147 static inline int tick_broadcast_update_freq(struct clock_event_device *dev,
 148                                              u32 freq) { return -ENODEV; }
 149
 150 /*
 151  * Set the periodic handler in non broadcast mode
 152  */
 153 static inline void tick_set_periodic_handler(struct clock_event_device *dev,
 154                                              int broadcast)
 155 {
 156         dev->event_handler = tick_handle_periodic;
 157 }
 158 #endif /* !BROADCAST */
 159
 160 /*
 161  * Check, if the device is functional or a dummy for broadcast
 162  */
 163 static inline int tick_device_is_functional(struct clock_event_device *dev)
 164 {
 165         return !(dev->features & CLOCK_EVT_FEAT_DUMMY);
 166 }
 167
 168 int __clockevents_update_freq(struct clock_event_device *dev, u32 freq);
 169
 170 #endif
 171
 172 extern void do_timer(unsigned long ticks);
 173 extern void update_wall_time(void);