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1/* SPDX-License-Identifier: GPL-2.0 */
2/*
3 * Tick related global functions
4 */
5#ifndef _LINUX_TICK_H
6#define _LINUX_TICK_H
7
8#include <linux/clockchips.h>
9#include <linux/irqflags.h>
10#include <linux/percpu.h>
11#include <linux/context_tracking_state.h>
12#include <linux/cpumask.h>
13#include <linux/sched.h>
14
15#ifdef CONFIG_GENERIC_CLOCKEVENTS
16extern void __init tick_init(void);
17/* Should be core only, but ARM BL switcher requires it */
18extern void tick_suspend_local(void);
19/* Should be core only, but XEN resume magic and ARM BL switcher require it */
20extern void tick_resume_local(void);
21extern void tick_handover_do_timer(void);
22extern void tick_cleanup_dead_cpu(int cpu);
23#else /* CONFIG_GENERIC_CLOCKEVENTS */
24static inline void tick_init(void) { }
25static inline void tick_suspend_local(void) { }
26static inline void tick_resume_local(void) { }
27static inline void tick_handover_do_timer(void) { }
28static inline void tick_cleanup_dead_cpu(int cpu) { }
29#endif /* !CONFIG_GENERIC_CLOCKEVENTS */
30
31#if defined(CONFIG_GENERIC_CLOCKEVENTS) && defined(CONFIG_SUSPEND)
32extern void tick_freeze(void);
33extern void tick_unfreeze(void);
34#else
35static inline void tick_freeze(void) { }
36static inline void tick_unfreeze(void) { }
37#endif
38
39#ifdef CONFIG_TICK_ONESHOT
40extern void tick_irq_enter(void);
41# ifndef arch_needs_cpu
42# define arch_needs_cpu() (0)
43# endif
44# else
45static inline void tick_irq_enter(void) { }
46#endif
47
48#if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT)
49extern void hotplug_cpu__broadcast_tick_pull(int dead_cpu);
50#else
51static inline void hotplug_cpu__broadcast_tick_pull(int dead_cpu) { }
52#endif
53
54enum tick_broadcast_mode {
55 TICK_BROADCAST_OFF,
56 TICK_BROADCAST_ON,
57 TICK_BROADCAST_FORCE,
58};
59
60enum tick_broadcast_state {
61 TICK_BROADCAST_EXIT,
62 TICK_BROADCAST_ENTER,
63};
64
65#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
66extern void tick_broadcast_control(enum tick_broadcast_mode mode);
67#else
68static inline void tick_broadcast_control(enum tick_broadcast_mode mode) { }
69#endif /* BROADCAST */
70
71#ifdef CONFIG_GENERIC_CLOCKEVENTS
72extern int tick_broadcast_oneshot_control(enum tick_broadcast_state state);
73#else
74static inline int tick_broadcast_oneshot_control(enum tick_broadcast_state state)
75{
76 return 0;
77}
78#endif
79
80static inline void tick_broadcast_enable(void)
81{
82 tick_broadcast_control(TICK_BROADCAST_ON);
83}
84static inline void tick_broadcast_disable(void)
85{
86 tick_broadcast_control(TICK_BROADCAST_OFF);
87}
88static inline void tick_broadcast_force(void)
89{
90 tick_broadcast_control(TICK_BROADCAST_FORCE);
91}
92static inline int tick_broadcast_enter(void)
93{
94 return tick_broadcast_oneshot_control(TICK_BROADCAST_ENTER);
95}
96static inline void tick_broadcast_exit(void)
97{
98 tick_broadcast_oneshot_control(TICK_BROADCAST_EXIT);
99}
100
101enum tick_dep_bits {
102 TICK_DEP_BIT_POSIX_TIMER = 0,
103 TICK_DEP_BIT_PERF_EVENTS = 1,
104 TICK_DEP_BIT_SCHED = 2,
105 TICK_DEP_BIT_CLOCK_UNSTABLE = 3
106};
107
108#define TICK_DEP_MASK_NONE 0
109#define TICK_DEP_MASK_POSIX_TIMER (1 << TICK_DEP_BIT_POSIX_TIMER)
110#define TICK_DEP_MASK_PERF_EVENTS (1 << TICK_DEP_BIT_PERF_EVENTS)
111#define TICK_DEP_MASK_SCHED (1 << TICK_DEP_BIT_SCHED)
112#define TICK_DEP_MASK_CLOCK_UNSTABLE (1 << TICK_DEP_BIT_CLOCK_UNSTABLE)
113
114#ifdef CONFIG_NO_HZ_COMMON
115extern bool tick_nohz_enabled;
116extern bool tick_nohz_tick_stopped(void);
117extern bool tick_nohz_tick_stopped_cpu(int cpu);
118extern void tick_nohz_idle_stop_tick(void);
119extern void tick_nohz_idle_retain_tick(void);
120extern void tick_nohz_idle_restart_tick(void);
121extern void tick_nohz_idle_enter(void);
122extern void tick_nohz_idle_exit(void);
123extern void tick_nohz_irq_exit(void);
124extern bool tick_nohz_idle_got_tick(void);
125extern ktime_t tick_nohz_get_sleep_length(ktime_t *delta_next);
126extern unsigned long tick_nohz_get_idle_calls(void);
127extern unsigned long tick_nohz_get_idle_calls_cpu(int cpu);
128extern u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time);
129extern u64 get_cpu_iowait_time_us(int cpu, u64 *last_update_time);
130
131static inline void tick_nohz_idle_stop_tick_protected(void)
132{
133 local_irq_disable();
134 tick_nohz_idle_stop_tick();
135 local_irq_enable();
136}
137
138#else /* !CONFIG_NO_HZ_COMMON */
139#define tick_nohz_enabled (0)
140static inline int tick_nohz_tick_stopped(void) { return 0; }
141static inline int tick_nohz_tick_stopped_cpu(int cpu) { return 0; }
142static inline void tick_nohz_idle_stop_tick(void) { }
143static inline void tick_nohz_idle_retain_tick(void) { }
144static inline void tick_nohz_idle_restart_tick(void) { }
145static inline void tick_nohz_idle_enter(void) { }
146static inline void tick_nohz_idle_exit(void) { }
147static inline bool tick_nohz_idle_got_tick(void) { return false; }
148
149static inline ktime_t tick_nohz_get_sleep_length(ktime_t *delta_next)
150{
151 *delta_next = TICK_NSEC;
152 return *delta_next;
153}
154static inline u64 get_cpu_idle_time_us(int cpu, u64 *unused) { return -1; }
155static inline u64 get_cpu_iowait_time_us(int cpu, u64 *unused) { return -1; }
156
157static inline void tick_nohz_idle_stop_tick_protected(void) { }
158#endif /* !CONFIG_NO_HZ_COMMON */
159
160#ifdef CONFIG_NO_HZ_FULL
161extern bool tick_nohz_full_running;
162extern cpumask_var_t tick_nohz_full_mask;
163
164static inline bool tick_nohz_full_enabled(void)
165{
166 if (!context_tracking_is_enabled())
167 return false;
168
169 return tick_nohz_full_running;
170}
171
172static inline bool tick_nohz_full_cpu(int cpu)
173{
174 if (!tick_nohz_full_enabled())
175 return false;
176
177 return cpumask_test_cpu(cpu, tick_nohz_full_mask);
178}
179
180static inline void tick_nohz_full_add_cpus_to(struct cpumask *mask)
181{
182 if (tick_nohz_full_enabled())
183 cpumask_or(mask, mask, tick_nohz_full_mask);
184}
185
186extern void tick_nohz_dep_set(enum tick_dep_bits bit);
187extern void tick_nohz_dep_clear(enum tick_dep_bits bit);
188extern void tick_nohz_dep_set_cpu(int cpu, enum tick_dep_bits bit);
189extern void tick_nohz_dep_clear_cpu(int cpu, enum tick_dep_bits bit);
190extern void tick_nohz_dep_set_task(struct task_struct *tsk,
191 enum tick_dep_bits bit);
192extern void tick_nohz_dep_clear_task(struct task_struct *tsk,
193 enum tick_dep_bits bit);
194extern void tick_nohz_dep_set_signal(struct signal_struct *signal,
195 enum tick_dep_bits bit);
196extern void tick_nohz_dep_clear_signal(struct signal_struct *signal,
197 enum tick_dep_bits bit);
198
199/*
200 * The below are tick_nohz_[set,clear]_dep() wrappers that optimize off-cases
201 * on top of static keys.
202 */
203static inline void tick_dep_set(enum tick_dep_bits bit)
204{
205 if (tick_nohz_full_enabled())
206 tick_nohz_dep_set(bit);
207}
208
209static inline void tick_dep_clear(enum tick_dep_bits bit)
210{
211 if (tick_nohz_full_enabled())
212 tick_nohz_dep_clear(bit);
213}
214
215static inline void tick_dep_set_cpu(int cpu, enum tick_dep_bits bit)
216{
217 if (tick_nohz_full_cpu(cpu))
218 tick_nohz_dep_set_cpu(cpu, bit);
219}
220
221static inline void tick_dep_clear_cpu(int cpu, enum tick_dep_bits bit)
222{
223 if (tick_nohz_full_cpu(cpu))
224 tick_nohz_dep_clear_cpu(cpu, bit);
225}
226
227static inline void tick_dep_set_task(struct task_struct *tsk,
228 enum tick_dep_bits bit)
229{
230 if (tick_nohz_full_enabled())
231 tick_nohz_dep_set_task(tsk, bit);
232}
233static inline void tick_dep_clear_task(struct task_struct *tsk,
234 enum tick_dep_bits bit)
235{
236 if (tick_nohz_full_enabled())
237 tick_nohz_dep_clear_task(tsk, bit);
238}
239static inline void tick_dep_set_signal(struct signal_struct *signal,
240 enum tick_dep_bits bit)
241{
242 if (tick_nohz_full_enabled())
243 tick_nohz_dep_set_signal(signal, bit);
244}
245static inline void tick_dep_clear_signal(struct signal_struct *signal,
246 enum tick_dep_bits bit)
247{
248 if (tick_nohz_full_enabled())
249 tick_nohz_dep_clear_signal(signal, bit);
250}
251
252extern void tick_nohz_full_kick_cpu(int cpu);
253extern void __tick_nohz_task_switch(void);
254extern void __init tick_nohz_full_setup(cpumask_var_t cpumask);
255#else
256static inline bool tick_nohz_full_enabled(void) { return false; }
257static inline bool tick_nohz_full_cpu(int cpu) { return false; }
258static inline void tick_nohz_full_add_cpus_to(struct cpumask *mask) { }
259
260static inline void tick_dep_set(enum tick_dep_bits bit) { }
261static inline void tick_dep_clear(enum tick_dep_bits bit) { }
262static inline void tick_dep_set_cpu(int cpu, enum tick_dep_bits bit) { }
263static inline void tick_dep_clear_cpu(int cpu, enum tick_dep_bits bit) { }
264static inline void tick_dep_set_task(struct task_struct *tsk,
265 enum tick_dep_bits bit) { }
266static inline void tick_dep_clear_task(struct task_struct *tsk,
267 enum tick_dep_bits bit) { }
268static inline void tick_dep_set_signal(struct signal_struct *signal,
269 enum tick_dep_bits bit) { }
270static inline void tick_dep_clear_signal(struct signal_struct *signal,
271 enum tick_dep_bits bit) { }
272
273static inline void tick_nohz_full_kick_cpu(int cpu) { }
274static inline void __tick_nohz_task_switch(void) { }
275static inline void tick_nohz_full_setup(cpumask_var_t cpumask) { }
276#endif
277
278static inline void tick_nohz_task_switch(void)
279{
280 if (tick_nohz_full_enabled())
281 __tick_nohz_task_switch();
282}
283
284#endif