Linux kernel mirror (for testing)
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kernel
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linux
1/*
2 * Tick related global functions
3 */
4#ifndef _LINUX_TICK_H
5#define _LINUX_TICK_H
6
7#include <linux/clockchips.h>
8#include <linux/irqflags.h>
9#include <linux/percpu.h>
10#include <linux/context_tracking_state.h>
11#include <linux/cpumask.h>
12#include <linux/sched.h>
13
14#ifdef CONFIG_GENERIC_CLOCKEVENTS
15extern void __init tick_init(void);
16/* Should be core only, but ARM BL switcher requires it */
17extern void tick_suspend_local(void);
18/* Should be core only, but XEN resume magic and ARM BL switcher require it */
19extern void tick_resume_local(void);
20extern void tick_handover_do_timer(void);
21extern void tick_cleanup_dead_cpu(int cpu);
22#else /* CONFIG_GENERIC_CLOCKEVENTS */
23static inline void tick_init(void) { }
24static inline void tick_suspend_local(void) { }
25static inline void tick_resume_local(void) { }
26static inline void tick_handover_do_timer(void) { }
27static inline void tick_cleanup_dead_cpu(int cpu) { }
28#endif /* !CONFIG_GENERIC_CLOCKEVENTS */
29
30#if defined(CONFIG_GENERIC_CLOCKEVENTS) && defined(CONFIG_SUSPEND)
31extern void tick_freeze(void);
32extern void tick_unfreeze(void);
33#else
34static inline void tick_freeze(void) { }
35static inline void tick_unfreeze(void) { }
36#endif
37
38#ifdef CONFIG_TICK_ONESHOT
39extern void tick_irq_enter(void);
40# ifndef arch_needs_cpu
41# define arch_needs_cpu() (0)
42# endif
43# else
44static inline void tick_irq_enter(void) { }
45#endif
46
47#if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT)
48extern void hotplug_cpu__broadcast_tick_pull(int dead_cpu);
49#else
50static inline void hotplug_cpu__broadcast_tick_pull(int dead_cpu) { }
51#endif
52
53enum tick_broadcast_mode {
54 TICK_BROADCAST_OFF,
55 TICK_BROADCAST_ON,
56 TICK_BROADCAST_FORCE,
57};
58
59enum tick_broadcast_state {
60 TICK_BROADCAST_EXIT,
61 TICK_BROADCAST_ENTER,
62};
63
64#ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
65extern void tick_broadcast_control(enum tick_broadcast_mode mode);
66#else
67static inline void tick_broadcast_control(enum tick_broadcast_mode mode) { }
68#endif /* BROADCAST */
69
70#ifdef CONFIG_GENERIC_CLOCKEVENTS
71extern int tick_broadcast_oneshot_control(enum tick_broadcast_state state);
72#else
73static inline int tick_broadcast_oneshot_control(enum tick_broadcast_state state)
74{
75 return 0;
76}
77#endif
78
79static inline void tick_broadcast_enable(void)
80{
81 tick_broadcast_control(TICK_BROADCAST_ON);
82}
83static inline void tick_broadcast_disable(void)
84{
85 tick_broadcast_control(TICK_BROADCAST_OFF);
86}
87static inline void tick_broadcast_force(void)
88{
89 tick_broadcast_control(TICK_BROADCAST_FORCE);
90}
91static inline int tick_broadcast_enter(void)
92{
93 return tick_broadcast_oneshot_control(TICK_BROADCAST_ENTER);
94}
95static inline void tick_broadcast_exit(void)
96{
97 tick_broadcast_oneshot_control(TICK_BROADCAST_EXIT);
98}
99
100enum tick_dep_bits {
101 TICK_DEP_BIT_POSIX_TIMER = 0,
102 TICK_DEP_BIT_PERF_EVENTS = 1,
103 TICK_DEP_BIT_SCHED = 2,
104 TICK_DEP_BIT_CLOCK_UNSTABLE = 3
105};
106
107#define TICK_DEP_MASK_NONE 0
108#define TICK_DEP_MASK_POSIX_TIMER (1 << TICK_DEP_BIT_POSIX_TIMER)
109#define TICK_DEP_MASK_PERF_EVENTS (1 << TICK_DEP_BIT_PERF_EVENTS)
110#define TICK_DEP_MASK_SCHED (1 << TICK_DEP_BIT_SCHED)
111#define TICK_DEP_MASK_CLOCK_UNSTABLE (1 << TICK_DEP_BIT_CLOCK_UNSTABLE)
112
113#ifdef CONFIG_NO_HZ_COMMON
114extern bool tick_nohz_enabled;
115extern int tick_nohz_tick_stopped(void);
116extern void tick_nohz_idle_enter(void);
117extern void tick_nohz_idle_exit(void);
118extern void tick_nohz_irq_exit(void);
119extern ktime_t tick_nohz_get_sleep_length(void);
120extern u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time);
121extern u64 get_cpu_iowait_time_us(int cpu, u64 *last_update_time);
122#else /* !CONFIG_NO_HZ_COMMON */
123#define tick_nohz_enabled (0)
124static inline int tick_nohz_tick_stopped(void) { return 0; }
125static inline void tick_nohz_idle_enter(void) { }
126static inline void tick_nohz_idle_exit(void) { }
127
128static inline ktime_t tick_nohz_get_sleep_length(void)
129{
130 ktime_t len = { .tv64 = NSEC_PER_SEC/HZ };
131
132 return len;
133}
134static inline u64 get_cpu_idle_time_us(int cpu, u64 *unused) { return -1; }
135static inline u64 get_cpu_iowait_time_us(int cpu, u64 *unused) { return -1; }
136#endif /* !CONFIG_NO_HZ_COMMON */
137
138#ifdef CONFIG_NO_HZ_FULL
139extern bool tick_nohz_full_running;
140extern cpumask_var_t tick_nohz_full_mask;
141extern cpumask_var_t housekeeping_mask;
142
143static inline bool tick_nohz_full_enabled(void)
144{
145 if (!context_tracking_is_enabled())
146 return false;
147
148 return tick_nohz_full_running;
149}
150
151static inline bool tick_nohz_full_cpu(int cpu)
152{
153 if (!tick_nohz_full_enabled())
154 return false;
155
156 return cpumask_test_cpu(cpu, tick_nohz_full_mask);
157}
158
159static inline void tick_nohz_full_add_cpus_to(struct cpumask *mask)
160{
161 if (tick_nohz_full_enabled())
162 cpumask_or(mask, mask, tick_nohz_full_mask);
163}
164
165static inline int housekeeping_any_cpu(void)
166{
167 return cpumask_any_and(housekeeping_mask, cpu_online_mask);
168}
169
170extern void tick_nohz_dep_set(enum tick_dep_bits bit);
171extern void tick_nohz_dep_clear(enum tick_dep_bits bit);
172extern void tick_nohz_dep_set_cpu(int cpu, enum tick_dep_bits bit);
173extern void tick_nohz_dep_clear_cpu(int cpu, enum tick_dep_bits bit);
174extern void tick_nohz_dep_set_task(struct task_struct *tsk,
175 enum tick_dep_bits bit);
176extern void tick_nohz_dep_clear_task(struct task_struct *tsk,
177 enum tick_dep_bits bit);
178extern void tick_nohz_dep_set_signal(struct signal_struct *signal,
179 enum tick_dep_bits bit);
180extern void tick_nohz_dep_clear_signal(struct signal_struct *signal,
181 enum tick_dep_bits bit);
182
183/*
184 * The below are tick_nohz_[set,clear]_dep() wrappers that optimize off-cases
185 * on top of static keys.
186 */
187static inline void tick_dep_set(enum tick_dep_bits bit)
188{
189 if (tick_nohz_full_enabled())
190 tick_nohz_dep_set(bit);
191}
192
193static inline void tick_dep_clear(enum tick_dep_bits bit)
194{
195 if (tick_nohz_full_enabled())
196 tick_nohz_dep_clear(bit);
197}
198
199static inline void tick_dep_set_cpu(int cpu, enum tick_dep_bits bit)
200{
201 if (tick_nohz_full_cpu(cpu))
202 tick_nohz_dep_set_cpu(cpu, bit);
203}
204
205static inline void tick_dep_clear_cpu(int cpu, enum tick_dep_bits bit)
206{
207 if (tick_nohz_full_cpu(cpu))
208 tick_nohz_dep_clear_cpu(cpu, bit);
209}
210
211static inline void tick_dep_set_task(struct task_struct *tsk,
212 enum tick_dep_bits bit)
213{
214 if (tick_nohz_full_enabled())
215 tick_nohz_dep_set_task(tsk, bit);
216}
217static inline void tick_dep_clear_task(struct task_struct *tsk,
218 enum tick_dep_bits bit)
219{
220 if (tick_nohz_full_enabled())
221 tick_nohz_dep_clear_task(tsk, bit);
222}
223static inline void tick_dep_set_signal(struct signal_struct *signal,
224 enum tick_dep_bits bit)
225{
226 if (tick_nohz_full_enabled())
227 tick_nohz_dep_set_signal(signal, bit);
228}
229static inline void tick_dep_clear_signal(struct signal_struct *signal,
230 enum tick_dep_bits bit)
231{
232 if (tick_nohz_full_enabled())
233 tick_nohz_dep_clear_signal(signal, bit);
234}
235
236extern void tick_nohz_full_kick_cpu(int cpu);
237extern void __tick_nohz_task_switch(void);
238#else
239static inline int housekeeping_any_cpu(void)
240{
241 return smp_processor_id();
242}
243static inline bool tick_nohz_full_enabled(void) { return false; }
244static inline bool tick_nohz_full_cpu(int cpu) { return false; }
245static inline void tick_nohz_full_add_cpus_to(struct cpumask *mask) { }
246
247static inline void tick_dep_set(enum tick_dep_bits bit) { }
248static inline void tick_dep_clear(enum tick_dep_bits bit) { }
249static inline void tick_dep_set_cpu(int cpu, enum tick_dep_bits bit) { }
250static inline void tick_dep_clear_cpu(int cpu, enum tick_dep_bits bit) { }
251static inline void tick_dep_set_task(struct task_struct *tsk,
252 enum tick_dep_bits bit) { }
253static inline void tick_dep_clear_task(struct task_struct *tsk,
254 enum tick_dep_bits bit) { }
255static inline void tick_dep_set_signal(struct signal_struct *signal,
256 enum tick_dep_bits bit) { }
257static inline void tick_dep_clear_signal(struct signal_struct *signal,
258 enum tick_dep_bits bit) { }
259
260static inline void tick_nohz_full_kick_cpu(int cpu) { }
261static inline void __tick_nohz_task_switch(void) { }
262#endif
263
264static inline const struct cpumask *housekeeping_cpumask(void)
265{
266#ifdef CONFIG_NO_HZ_FULL
267 if (tick_nohz_full_enabled())
268 return housekeeping_mask;
269#endif
270 return cpu_possible_mask;
271}
272
273static inline bool is_housekeeping_cpu(int cpu)
274{
275#ifdef CONFIG_NO_HZ_FULL
276 if (tick_nohz_full_enabled())
277 return cpumask_test_cpu(cpu, housekeeping_mask);
278#endif
279 return true;
280}
281
282static inline void housekeeping_affine(struct task_struct *t)
283{
284#ifdef CONFIG_NO_HZ_FULL
285 if (tick_nohz_full_enabled())
286 set_cpus_allowed_ptr(t, housekeeping_mask);
287
288#endif
289}
290
291static inline void tick_nohz_task_switch(void)
292{
293 if (tick_nohz_full_enabled())
294 __tick_nohz_task_switch();
295}
296
297#endif