1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * tick internal variable and functions used by low/high res code
4 */
5 #include <linux/hrtimer.h>
6 #include <linux/tick.h>
7
8 #include "timekeeping.h"
9 #include "tick-sched.h"
10
11 #ifdef CONFIG_GENERIC_CLOCKEVENTS
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 int tick_do_timer_cpu __read_mostly;
19
20 extern void tick_setup_periodic(struct clock_event_device *dev, int broadcast);
21 extern void tick_handle_periodic(struct clock_event_device *dev);
22 extern void tick_check_new_device(struct clock_event_device *dev);
23 extern void tick_shutdown(unsigned int cpu);
24 extern void tick_suspend(void);
25 extern void tick_resume(void);
26 extern bool tick_check_replacement(struct clock_event_device *curdev,
27 struct clock_event_device *newdev);
28 extern void tick_install_replacement(struct clock_event_device *dev);
29 extern int tick_is_oneshot_available(void);
30 extern struct tick_device *tick_get_device(int cpu);
31
32 extern int clockevents_tick_resume(struct clock_event_device *dev);
33 /* Check, if the device is functional or a dummy for broadcast */
tick_device_is_functional(struct clock_event_device * dev)34 static inline int tick_device_is_functional(struct clock_event_device *dev)
35 {
36 return !(dev->features & CLOCK_EVT_FEAT_DUMMY);
37 }
38
clockevent_get_state(struct clock_event_device * dev)39 static inline enum clock_event_state clockevent_get_state(struct clock_event_device *dev)
40 {
41 return dev->state_use_accessors;
42 }
43
clockevent_set_state(struct clock_event_device * dev,enum clock_event_state state)44 static inline void clockevent_set_state(struct clock_event_device *dev,
45 enum clock_event_state state)
46 {
47 dev->state_use_accessors = state;
48 }
49
50 extern void clockevents_shutdown(struct clock_event_device *dev);
51 extern void clockevents_exchange_device(struct clock_event_device *old,
52 struct clock_event_device *new);
53 extern void clockevents_switch_state(struct clock_event_device *dev,
54 enum clock_event_state state);
55 extern int clockevents_program_event(struct clock_event_device *dev,
56 ktime_t expires, bool force);
57 extern void clockevents_handle_noop(struct clock_event_device *dev);
58 extern int __clockevents_update_freq(struct clock_event_device *dev, u32 freq);
59 extern ssize_t sysfs_get_uname(const char *buf, char *dst, size_t cnt);
60
61 /* Broadcasting support */
62 # ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
63 extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu);
64 extern void tick_install_broadcast_device(struct clock_event_device *dev);
65 extern int tick_is_broadcast_device(struct clock_event_device *dev);
66 extern void tick_suspend_broadcast(void);
67 extern void tick_resume_broadcast(void);
68 extern bool tick_resume_check_broadcast(void);
69 extern void tick_broadcast_init(void);
70 extern void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast);
71 extern int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq);
72 extern struct tick_device *tick_get_broadcast_device(void);
73 extern struct cpumask *tick_get_broadcast_mask(void);
74 # else /* !CONFIG_GENERIC_CLOCKEVENTS_BROADCAST: */
tick_install_broadcast_device(struct clock_event_device * dev)75 static inline void tick_install_broadcast_device(struct clock_event_device *dev) { }
tick_is_broadcast_device(struct clock_event_device * dev)76 static inline int tick_is_broadcast_device(struct clock_event_device *dev) { return 0; }
tick_device_uses_broadcast(struct clock_event_device * dev,int cpu)77 static inline int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu) { return 0; }
tick_do_periodic_broadcast(struct clock_event_device * d)78 static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { }
tick_suspend_broadcast(void)79 static inline void tick_suspend_broadcast(void) { }
tick_resume_broadcast(void)80 static inline void tick_resume_broadcast(void) { }
tick_resume_check_broadcast(void)81 static inline bool tick_resume_check_broadcast(void) { return false; }
tick_broadcast_init(void)82 static inline void tick_broadcast_init(void) { }
tick_broadcast_update_freq(struct clock_event_device * dev,u32 freq)83 static inline int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq) { return -ENODEV; }
84
85 /* Set the periodic handler in non broadcast mode */
tick_set_periodic_handler(struct clock_event_device * dev,int broadcast)86 static inline void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast)
87 {
88 dev->event_handler = tick_handle_periodic;
89 }
90 # endif /* !CONFIG_GENERIC_CLOCKEVENTS_BROADCAST */
91
92 #else /* !GENERIC_CLOCKEVENTS: */
tick_suspend(void)93 static inline void tick_suspend(void) { }
tick_resume(void)94 static inline void tick_resume(void) { }
95 #endif /* !GENERIC_CLOCKEVENTS */
96
97 /* Oneshot related functions */
98 #ifdef CONFIG_TICK_ONESHOT
99 extern void tick_setup_oneshot(struct clock_event_device *newdev,
100 void (*handler)(struct clock_event_device *),
101 ktime_t nextevt);
102 extern int tick_program_event(ktime_t expires, int force);
103 extern void tick_oneshot_notify(void);
104 extern int tick_switch_to_oneshot(void (*handler)(struct clock_event_device *));
105 extern void tick_resume_oneshot(void);
tick_oneshot_possible(void)106 static inline bool tick_oneshot_possible(void) { return true; }
107 extern int tick_oneshot_mode_active(void);
108 extern void tick_clock_notify(void);
109 extern int tick_check_oneshot_change(int allow_nohz);
110 extern int tick_init_highres(void);
111 #else /* !CONFIG_TICK_ONESHOT: */
112 static inline
tick_setup_oneshot(struct clock_event_device * newdev,void (* handler)(struct clock_event_device *),ktime_t nextevt)113 void tick_setup_oneshot(struct clock_event_device *newdev,
114 void (*handler)(struct clock_event_device *),
115 ktime_t nextevt) { BUG(); }
tick_resume_oneshot(void)116 static inline void tick_resume_oneshot(void) { BUG(); }
tick_program_event(ktime_t expires,int force)117 static inline int tick_program_event(ktime_t expires, int force) { return 0; }
tick_oneshot_notify(void)118 static inline void tick_oneshot_notify(void) { }
tick_oneshot_possible(void)119 static inline bool tick_oneshot_possible(void) { return false; }
tick_oneshot_mode_active(void)120 static inline int tick_oneshot_mode_active(void) { return 0; }
tick_clock_notify(void)121 static inline void tick_clock_notify(void) { }
tick_check_oneshot_change(int allow_nohz)122 static inline int tick_check_oneshot_change(int allow_nohz) { return 0; }
123 #endif /* !CONFIG_TICK_ONESHOT */
124
125 /* Functions related to oneshot broadcasting */
126 #if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT)
127 extern void tick_broadcast_switch_to_oneshot(void);
128 extern int tick_broadcast_oneshot_active(void);
129 extern void tick_check_oneshot_broadcast_this_cpu(void);
130 bool tick_broadcast_oneshot_available(void);
131 extern struct cpumask *tick_get_broadcast_oneshot_mask(void);
132 #else /* !(BROADCAST && ONESHOT): */
tick_broadcast_switch_to_oneshot(void)133 static inline void tick_broadcast_switch_to_oneshot(void) { }
tick_broadcast_oneshot_active(void)134 static inline int tick_broadcast_oneshot_active(void) { return 0; }
tick_check_oneshot_broadcast_this_cpu(void)135 static inline void tick_check_oneshot_broadcast_this_cpu(void) { }
tick_broadcast_oneshot_available(void)136 static inline bool tick_broadcast_oneshot_available(void) { return tick_oneshot_possible(); }
137 #endif /* !(BROADCAST && ONESHOT) */
138
139 #if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_HOTPLUG_CPU)
140 extern void tick_broadcast_offline(unsigned int cpu);
141 #else
tick_broadcast_offline(unsigned int cpu)142 static inline void tick_broadcast_offline(unsigned int cpu) { }
143 #endif
144
145 /* NO_HZ_FULL internal */
146 #ifdef CONFIG_NO_HZ_FULL
147 extern void tick_nohz_init(void);
148 # else
tick_nohz_init(void)149 static inline void tick_nohz_init(void) { }
150 #endif
151
152 #ifdef CONFIG_NO_HZ_COMMON
153 extern unsigned long tick_nohz_active;
154 extern void timers_update_nohz(void);
155 # ifdef CONFIG_SMP
156 extern struct static_key_false timers_migration_enabled;
157 # endif
158 #else /* CONFIG_NO_HZ_COMMON */
timers_update_nohz(void)159 static inline void timers_update_nohz(void) { }
160 #define tick_nohz_active (0)
161 #endif
162
163 DECLARE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases);
164
165 extern u64 get_next_timer_interrupt(unsigned long basej, u64 basem);
166 void timer_clear_idle(void);
167
168 void clock_was_set(void);
169 void clock_was_set_delayed(void);
170