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