Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
f8381cba TG |
2 | /* |
3 | * tick internal variable and functions used by low/high res code | |
4 | */ | |
e2830b5c TH |
5 | #include <linux/hrtimer.h> |
6 | #include <linux/tick.h> | |
6441402b | 7 | |
8b094cd0 | 8 | #include "timekeeping.h" |
c1797baf | 9 | #include "tick-sched.h" |
8b094cd0 | 10 | |
9f083b74 | 11 | #ifdef CONFIG_GENERIC_CLOCKEVENTS |
6441402b | 12 | |
3ae7a939 IM |
13 | # define TICK_DO_TIMER_NONE -1 |
14 | # define TICK_DO_TIMER_BOOT -2 | |
6441402b | 15 | |
f8381cba | 16 | DECLARE_PER_CPU(struct tick_device, tick_cpu_device); |
f8381cba | 17 | extern ktime_t tick_next_period; |
d3ed7824 | 18 | extern int tick_do_timer_cpu __read_mostly; |
f8381cba TG |
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); | |
7172a286 | 22 | extern void tick_check_new_device(struct clock_event_device *dev); |
a49b116d | 23 | extern void tick_shutdown(unsigned int cpu); |
8c53daf6 | 24 | extern void tick_suspend(void); |
f46481d0 | 25 | extern void tick_resume(void); |
03e13cf5 TG |
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); | |
c1797baf | 29 | extern int tick_is_oneshot_available(void); |
7270d11c | 30 | extern struct tick_device *tick_get_device(int cpu); |
f8381cba | 31 | |
554ef387 | 32 | extern int clockevents_tick_resume(struct clock_event_device *dev); |
b7475eb5 TG |
33 | /* Check, if the device is functional or a dummy for broadcast */ |
34 | static inline int tick_device_is_functional(struct clock_event_device *dev) | |
35 | { | |
36 | return !(dev->features & CLOCK_EVT_FEAT_DUMMY); | |
37 | } | |
2344abbc | 38 | |
d7eb231c TG |
39 | static inline enum clock_event_state clockevent_get_state(struct clock_event_device *dev) |
40 | { | |
be3ef76e | 41 | return dev->state_use_accessors; |
d7eb231c TG |
42 | } |
43 | ||
44 | static inline void clockevent_set_state(struct clock_event_device *dev, | |
45 | enum clock_event_state state) | |
46 | { | |
be3ef76e | 47 | dev->state_use_accessors = state; |
d7eb231c TG |
48 | } |
49 | ||
b7475eb5 | 50 | extern void clockevents_shutdown(struct clock_event_device *dev); |
c1797baf TG |
51 | extern void clockevents_exchange_device(struct clock_event_device *old, |
52 | struct clock_event_device *new); | |
d7eb231c TG |
53 | extern void clockevents_switch_state(struct clock_event_device *dev, |
54 | enum clock_event_state state); | |
7270d11c TG |
55 | extern int clockevents_program_event(struct clock_event_device *dev, |
56 | ktime_t expires, bool force); | |
c1797baf | 57 | extern void clockevents_handle_noop(struct clock_event_device *dev); |
b7475eb5 | 58 | extern int __clockevents_update_freq(struct clock_event_device *dev, u32 freq); |
79bf2bb3 | 59 | |
b7475eb5 | 60 | /* Broadcasting support */ |
3ae7a939 | 61 | # ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST |
f8381cba | 62 | extern int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu); |
c94a8537 | 63 | extern void tick_install_broadcast_device(struct clock_event_device *dev, int cpu); |
f8381cba | 64 | extern int tick_is_broadcast_device(struct clock_event_device *dev); |
6321dd60 | 65 | extern void tick_suspend_broadcast(void); |
f46481d0 TG |
66 | extern void tick_resume_broadcast(void); |
67 | extern bool tick_resume_check_broadcast(void); | |
b352bc1c | 68 | extern void tick_broadcast_init(void); |
b7475eb5 TG |
69 | extern void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast); |
70 | extern int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq); | |
c1797baf TG |
71 | extern struct tick_device *tick_get_broadcast_device(void); |
72 | extern struct cpumask *tick_get_broadcast_mask(void); | |
245a057f | 73 | extern const struct clock_event_device *tick_get_wakeup_device(int cpu); |
3ae7a939 | 74 | # else /* !CONFIG_GENERIC_CLOCKEVENTS_BROADCAST: */ |
c94a8537 | 75 | static inline void tick_install_broadcast_device(struct clock_event_device *dev, int cpu) { } |
b7475eb5 TG |
76 | static inline int tick_is_broadcast_device(struct clock_event_device *dev) { return 0; } |
77 | static inline int tick_device_uses_broadcast(struct clock_event_device *dev, int cpu) { return 0; } | |
f8381cba | 78 | static inline void tick_do_periodic_broadcast(struct clock_event_device *d) { } |
6321dd60 | 79 | static inline void tick_suspend_broadcast(void) { } |
f46481d0 TG |
80 | static inline void tick_resume_broadcast(void) { } |
81 | static inline bool tick_resume_check_broadcast(void) { return false; } | |
b352bc1c | 82 | static inline void tick_broadcast_init(void) { } |
b7475eb5 | 83 | static inline int tick_broadcast_update_freq(struct clock_event_device *dev, u32 freq) { return -ENODEV; } |
f8381cba | 84 | |
b7475eb5 TG |
85 | /* Set the periodic handler in non broadcast mode */ |
86 | static inline void tick_set_periodic_handler(struct clock_event_device *dev, int broadcast) | |
f8381cba TG |
87 | { |
88 | dev->event_handler = tick_handle_periodic; | |
89 | } | |
3ae7a939 IM |
90 | # endif /* !CONFIG_GENERIC_CLOCKEVENTS_BROADCAST */ |
91 | ||
92 | #else /* !GENERIC_CLOCKEVENTS: */ | |
93 | static inline void tick_suspend(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); | |
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 | |
113 | void tick_setup_oneshot(struct clock_event_device *newdev, | |
114 | void (*handler)(struct clock_event_device *), | |
115 | ktime_t nextevt) { BUG(); } | |
116 | static inline void tick_resume_oneshot(void) { BUG(); } | |
117 | static inline int tick_program_event(ktime_t expires, int force) { return 0; } | |
118 | static inline void tick_oneshot_notify(void) { } | |
119 | static inline bool tick_oneshot_possible(void) { return false; } | |
120 | static inline int tick_oneshot_mode_active(void) { return 0; } | |
121 | static inline void tick_clock_notify(void) { } | |
122 | static inline int tick_check_oneshot_change(int allow_nohz) { return 0; } | |
123 | #endif /* !CONFIG_TICK_ONESHOT */ | |
f8381cba | 124 | |
b7475eb5 TG |
125 | /* Functions related to oneshot broadcasting */ |
126 | #if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT) | |
b7475eb5 | 127 | extern void tick_broadcast_switch_to_oneshot(void); |
b7475eb5 TG |
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); | |
c1797baf | 131 | extern struct cpumask *tick_get_broadcast_oneshot_mask(void); |
3ae7a939 | 132 | #else /* !(BROADCAST && ONESHOT): */ |
b7475eb5 | 133 | static inline void tick_broadcast_switch_to_oneshot(void) { } |
b7475eb5 TG |
134 | static inline int tick_broadcast_oneshot_active(void) { return 0; } |
135 | static inline void tick_check_oneshot_broadcast_this_cpu(void) { } | |
136 | static inline bool tick_broadcast_oneshot_available(void) { return tick_oneshot_possible(); } | |
3ae7a939 | 137 | #endif /* !(BROADCAST && ONESHOT) */ |
7cf37e87 | 138 | |
1b72d432 TG |
139 | #if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_HOTPLUG_CPU) |
140 | extern void tick_broadcast_offline(unsigned int cpu); | |
141 | #else | |
142 | static inline void tick_broadcast_offline(unsigned int cpu) { } | |
143 | #endif | |
144 | ||
b7475eb5 TG |
145 | /* NO_HZ_FULL internal */ |
146 | #ifdef CONFIG_NO_HZ_FULL | |
147 | extern void tick_nohz_init(void); | |
148 | # else | |
149 | static inline void tick_nohz_init(void) { } | |
150 | #endif | |
c1ad348b | 151 | |
bc7a34b8 TG |
152 | #ifdef CONFIG_NO_HZ_COMMON |
153 | extern unsigned long tick_nohz_active; | |
ae67bada | 154 | extern void timers_update_nohz(void); |
ae67bada TG |
155 | # ifdef CONFIG_SMP |
156 | extern struct static_key_false timers_migration_enabled; | |
157 | # endif | |
158 | #else /* CONFIG_NO_HZ_COMMON */ | |
159 | static inline void timers_update_nohz(void) { } | |
bc7a34b8 | 160 | #define tick_nohz_active (0) |
bc7a34b8 TG |
161 | #endif |
162 | ||
163 | DECLARE_PER_CPU(struct hrtimer_cpu_base, hrtimer_bases); | |
164 | ||
c1ad348b | 165 | extern u64 get_next_timer_interrupt(unsigned long basej, u64 basem); |
a683f390 | 166 | void timer_clear_idle(void); |
8c3b5e6e | 167 | |
17a1b882 TG |
168 | #define CLOCK_SET_WALL \ |
169 | (BIT(HRTIMER_BASE_REALTIME) | BIT(HRTIMER_BASE_REALTIME_SOFT) | \ | |
170 | BIT(HRTIMER_BASE_TAI) | BIT(HRTIMER_BASE_TAI_SOFT)) | |
171 | ||
172 | #define CLOCK_SET_BOOT \ | |
173 | (BIT(HRTIMER_BASE_BOOTTIME) | BIT(HRTIMER_BASE_BOOTTIME_SOFT)) | |
174 | ||
175 | void clock_was_set(unsigned int bases); | |
8c3b5e6e | 176 | void clock_was_set_delayed(void); |
a761a67f TG |
177 | |
178 | void hrtimers_resume_local(void); | |
d25a0252 PM |
179 | |
180 | /* Since jiffies uses a simple TICK_NSEC multiplier | |
181 | * conversion, the .shift value could be zero. However | |
182 | * this would make NTP adjustments impossible as they are | |
183 | * in units of 1/2^.shift. Thus we use JIFFIES_SHIFT to | |
184 | * shift both the nominator and denominator the same | |
185 | * amount, and give ntp adjustments in units of 1/2^8 | |
186 | * | |
187 | * The value 8 is somewhat carefully chosen, as anything | |
188 | * larger can result in overflows. TICK_NSEC grows as HZ | |
189 | * shrinks, so values greater than 8 overflow 32bits when | |
190 | * HZ=100. | |
191 | */ | |
192 | #if HZ < 34 | |
193 | #define JIFFIES_SHIFT 6 | |
194 | #elif HZ < 67 | |
195 | #define JIFFIES_SHIFT 7 | |
196 | #else | |
197 | #define JIFFIES_SHIFT 8 | |
198 | #endif | |
a89299c4 AB |
199 | |
200 | extern ssize_t sysfs_get_uname(const char *buf, char *dst, size_t cnt); |