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