Line data Source code
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
16 : extern void __init tick_init(void);
17 : /* Should be core only, but ARM BL switcher requires it */
18 : extern void tick_suspend_local(void);
19 : /* Should be core only, but XEN resume magic and ARM BL switcher require it */
20 : extern void tick_resume_local(void);
21 : extern void tick_handover_do_timer(void);
22 : extern void tick_cleanup_dead_cpu(int cpu);
23 : #else /* CONFIG_GENERIC_CLOCKEVENTS */
24 : static inline void tick_init(void) { }
25 : static inline void tick_suspend_local(void) { }
26 : static inline void tick_resume_local(void) { }
27 : static inline void tick_handover_do_timer(void) { }
28 : static inline void tick_cleanup_dead_cpu(int cpu) { }
29 : #endif /* !CONFIG_GENERIC_CLOCKEVENTS */
30 :
31 : #if defined(CONFIG_GENERIC_CLOCKEVENTS) && defined(CONFIG_SUSPEND)
32 : extern void tick_freeze(void);
33 : extern void tick_unfreeze(void);
34 : #else
35 : static inline void tick_freeze(void) { }
36 : static inline void tick_unfreeze(void) { }
37 : #endif
38 :
39 : #ifdef CONFIG_TICK_ONESHOT
40 : extern void tick_irq_enter(void);
41 : # ifndef arch_needs_cpu
42 : # define arch_needs_cpu() (0)
43 : # endif
44 : # else
45 : static inline void tick_irq_enter(void) { }
46 : #endif
47 :
48 : #if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT)
49 : extern void hotplug_cpu__broadcast_tick_pull(int dead_cpu);
50 : #else
51 : static inline void hotplug_cpu__broadcast_tick_pull(int dead_cpu) { }
52 : #endif
53 :
54 : enum tick_broadcast_mode {
55 : TICK_BROADCAST_OFF,
56 : TICK_BROADCAST_ON,
57 : TICK_BROADCAST_FORCE,
58 : };
59 :
60 : enum tick_broadcast_state {
61 : TICK_BROADCAST_EXIT,
62 : TICK_BROADCAST_ENTER,
63 : };
64 :
65 : #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
66 : extern void tick_broadcast_control(enum tick_broadcast_mode mode);
67 : #else
68 : static inline void tick_broadcast_control(enum tick_broadcast_mode mode) { }
69 : #endif /* BROADCAST */
70 :
71 : #if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_HOTPLUG_CPU)
72 : extern void tick_offline_cpu(unsigned int cpu);
73 : #else
74 : static inline void tick_offline_cpu(unsigned int cpu) { }
75 : #endif
76 :
77 : #ifdef CONFIG_GENERIC_CLOCKEVENTS
78 : extern int tick_broadcast_oneshot_control(enum tick_broadcast_state state);
79 : #else
80 : static inline int tick_broadcast_oneshot_control(enum tick_broadcast_state state)
81 : {
82 : return 0;
83 : }
84 : #endif
85 :
86 : static inline void tick_broadcast_enable(void)
87 : {
88 : tick_broadcast_control(TICK_BROADCAST_ON);
89 : }
90 : static inline void tick_broadcast_disable(void)
91 : {
92 : tick_broadcast_control(TICK_BROADCAST_OFF);
93 : }
94 0 : static inline void tick_broadcast_force(void)
95 : {
96 0 : tick_broadcast_control(TICK_BROADCAST_FORCE);
97 : }
98 0 : static inline int tick_broadcast_enter(void)
99 : {
100 0 : return tick_broadcast_oneshot_control(TICK_BROADCAST_ENTER);
101 : }
102 0 : static inline void tick_broadcast_exit(void)
103 : {
104 0 : tick_broadcast_oneshot_control(TICK_BROADCAST_EXIT);
105 : }
106 :
107 : enum tick_dep_bits {
108 : TICK_DEP_BIT_POSIX_TIMER = 0,
109 : TICK_DEP_BIT_PERF_EVENTS = 1,
110 : TICK_DEP_BIT_SCHED = 2,
111 : TICK_DEP_BIT_CLOCK_UNSTABLE = 3,
112 : TICK_DEP_BIT_RCU = 4,
113 : TICK_DEP_BIT_RCU_EXP = 5
114 : };
115 : #define TICK_DEP_BIT_MAX TICK_DEP_BIT_RCU_EXP
116 :
117 : #define TICK_DEP_MASK_NONE 0
118 : #define TICK_DEP_MASK_POSIX_TIMER (1 << TICK_DEP_BIT_POSIX_TIMER)
119 : #define TICK_DEP_MASK_PERF_EVENTS (1 << TICK_DEP_BIT_PERF_EVENTS)
120 : #define TICK_DEP_MASK_SCHED (1 << TICK_DEP_BIT_SCHED)
121 : #define TICK_DEP_MASK_CLOCK_UNSTABLE (1 << TICK_DEP_BIT_CLOCK_UNSTABLE)
122 : #define TICK_DEP_MASK_RCU (1 << TICK_DEP_BIT_RCU)
123 : #define TICK_DEP_MASK_RCU_EXP (1 << TICK_DEP_BIT_RCU_EXP)
124 :
125 : #ifdef CONFIG_NO_HZ_COMMON
126 : extern bool tick_nohz_enabled;
127 : extern bool tick_nohz_tick_stopped(void);
128 : extern bool tick_nohz_tick_stopped_cpu(int cpu);
129 : extern void tick_nohz_idle_stop_tick(void);
130 : extern void tick_nohz_idle_retain_tick(void);
131 : extern void tick_nohz_idle_restart_tick(void);
132 : extern void tick_nohz_idle_enter(void);
133 : extern void tick_nohz_idle_exit(void);
134 : extern void tick_nohz_irq_exit(void);
135 : extern bool tick_nohz_idle_got_tick(void);
136 : extern ktime_t tick_nohz_get_next_hrtimer(void);
137 : extern ktime_t tick_nohz_get_sleep_length(ktime_t *delta_next);
138 : extern unsigned long tick_nohz_get_idle_calls(void);
139 : extern unsigned long tick_nohz_get_idle_calls_cpu(int cpu);
140 : extern u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time);
141 : extern u64 get_cpu_iowait_time_us(int cpu, u64 *last_update_time);
142 :
143 : static inline void tick_nohz_idle_stop_tick_protected(void)
144 : {
145 : local_irq_disable();
146 : tick_nohz_idle_stop_tick();
147 : local_irq_enable();
148 : }
149 :
150 : #else /* !CONFIG_NO_HZ_COMMON */
151 : #define tick_nohz_enabled (0)
152 : static inline int tick_nohz_tick_stopped(void) { return 0; }
153 : static inline int tick_nohz_tick_stopped_cpu(int cpu) { return 0; }
154 : static inline void tick_nohz_idle_stop_tick(void) { }
155 : static inline void tick_nohz_idle_retain_tick(void) { }
156 : static inline void tick_nohz_idle_restart_tick(void) { }
157 : static inline void tick_nohz_idle_enter(void) { }
158 : static inline void tick_nohz_idle_exit(void) { }
159 : static inline bool tick_nohz_idle_got_tick(void) { return false; }
160 : static inline ktime_t tick_nohz_get_next_hrtimer(void)
161 : {
162 : /* Next wake up is the tick period, assume it starts now */
163 : return ktime_add(ktime_get(), TICK_NSEC);
164 : }
165 : static inline ktime_t tick_nohz_get_sleep_length(ktime_t *delta_next)
166 : {
167 : *delta_next = TICK_NSEC;
168 : return *delta_next;
169 : }
170 : static inline u64 get_cpu_idle_time_us(int cpu, u64 *unused) { return -1; }
171 : static inline u64 get_cpu_iowait_time_us(int cpu, u64 *unused) { return -1; }
172 :
173 : static inline void tick_nohz_idle_stop_tick_protected(void) { }
174 : #endif /* !CONFIG_NO_HZ_COMMON */
175 :
176 : #ifdef CONFIG_NO_HZ_FULL
177 : extern bool tick_nohz_full_running;
178 : extern cpumask_var_t tick_nohz_full_mask;
179 :
180 : static inline bool tick_nohz_full_enabled(void)
181 : {
182 : if (!context_tracking_enabled())
183 : return false;
184 :
185 : return tick_nohz_full_running;
186 : }
187 :
188 : static inline bool tick_nohz_full_cpu(int cpu)
189 : {
190 : if (!tick_nohz_full_enabled())
191 : return false;
192 :
193 : return cpumask_test_cpu(cpu, tick_nohz_full_mask);
194 : }
195 :
196 : static inline void tick_nohz_full_add_cpus_to(struct cpumask *mask)
197 : {
198 : if (tick_nohz_full_enabled())
199 : cpumask_or(mask, mask, tick_nohz_full_mask);
200 : }
201 :
202 : extern void tick_nohz_dep_set(enum tick_dep_bits bit);
203 : extern void tick_nohz_dep_clear(enum tick_dep_bits bit);
204 : extern void tick_nohz_dep_set_cpu(int cpu, enum tick_dep_bits bit);
205 : extern void tick_nohz_dep_clear_cpu(int cpu, enum tick_dep_bits bit);
206 : extern void tick_nohz_dep_set_task(struct task_struct *tsk,
207 : enum tick_dep_bits bit);
208 : extern void tick_nohz_dep_clear_task(struct task_struct *tsk,
209 : enum tick_dep_bits bit);
210 : extern void tick_nohz_dep_set_signal(struct signal_struct *signal,
211 : enum tick_dep_bits bit);
212 : extern void tick_nohz_dep_clear_signal(struct signal_struct *signal,
213 : enum tick_dep_bits bit);
214 :
215 : /*
216 : * The below are tick_nohz_[set,clear]_dep() wrappers that optimize off-cases
217 : * on top of static keys.
218 : */
219 : static inline void tick_dep_set(enum tick_dep_bits bit)
220 : {
221 : if (tick_nohz_full_enabled())
222 : tick_nohz_dep_set(bit);
223 : }
224 :
225 : static inline void tick_dep_clear(enum tick_dep_bits bit)
226 : {
227 : if (tick_nohz_full_enabled())
228 : tick_nohz_dep_clear(bit);
229 : }
230 :
231 : static inline void tick_dep_set_cpu(int cpu, enum tick_dep_bits bit)
232 : {
233 : if (tick_nohz_full_cpu(cpu))
234 : tick_nohz_dep_set_cpu(cpu, bit);
235 : }
236 :
237 : static inline void tick_dep_clear_cpu(int cpu, enum tick_dep_bits bit)
238 : {
239 : if (tick_nohz_full_cpu(cpu))
240 : tick_nohz_dep_clear_cpu(cpu, bit);
241 : }
242 :
243 : static inline void tick_dep_set_task(struct task_struct *tsk,
244 : enum tick_dep_bits bit)
245 : {
246 : if (tick_nohz_full_enabled())
247 : tick_nohz_dep_set_task(tsk, bit);
248 : }
249 : static inline void tick_dep_clear_task(struct task_struct *tsk,
250 : enum tick_dep_bits bit)
251 : {
252 : if (tick_nohz_full_enabled())
253 : tick_nohz_dep_clear_task(tsk, bit);
254 : }
255 : static inline void tick_dep_set_signal(struct signal_struct *signal,
256 : enum tick_dep_bits bit)
257 : {
258 : if (tick_nohz_full_enabled())
259 : tick_nohz_dep_set_signal(signal, bit);
260 : }
261 : static inline void tick_dep_clear_signal(struct signal_struct *signal,
262 : enum tick_dep_bits bit)
263 : {
264 : if (tick_nohz_full_enabled())
265 : tick_nohz_dep_clear_signal(signal, bit);
266 : }
267 :
268 : extern void tick_nohz_full_kick_cpu(int cpu);
269 : extern void __tick_nohz_task_switch(void);
270 : extern void __init tick_nohz_full_setup(cpumask_var_t cpumask);
271 : #else
272 26678 : static inline bool tick_nohz_full_enabled(void) { return false; }
273 958 : static inline bool tick_nohz_full_cpu(int cpu) { return false; }
274 : static inline void tick_nohz_full_add_cpus_to(struct cpumask *mask) { }
275 :
276 : static inline void tick_nohz_dep_set_cpu(int cpu, enum tick_dep_bits bit) { }
277 : static inline void tick_nohz_dep_clear_cpu(int cpu, enum tick_dep_bits bit) { }
278 :
279 0 : static inline void tick_dep_set(enum tick_dep_bits bit) { }
280 4 : static inline void tick_dep_clear(enum tick_dep_bits bit) { }
281 0 : static inline void tick_dep_set_cpu(int cpu, enum tick_dep_bits bit) { }
282 32459 : static inline void tick_dep_clear_cpu(int cpu, enum tick_dep_bits bit) { }
283 48779 : static inline void tick_dep_set_task(struct task_struct *tsk,
284 48779 : enum tick_dep_bits bit) { }
285 48775 : static inline void tick_dep_clear_task(struct task_struct *tsk,
286 48775 : enum tick_dep_bits bit) { }
287 0 : static inline void tick_dep_set_signal(struct signal_struct *signal,
288 0 : enum tick_dep_bits bit) { }
289 0 : static inline void tick_dep_clear_signal(struct signal_struct *signal,
290 0 : enum tick_dep_bits bit) { }
291 :
292 : static inline void tick_nohz_full_kick_cpu(int cpu) { }
293 : static inline void __tick_nohz_task_switch(void) { }
294 : static inline void tick_nohz_full_setup(cpumask_var_t cpumask) { }
295 : #endif
296 :
297 26516 : static inline void tick_nohz_task_switch(void)
298 : {
299 26516 : if (tick_nohz_full_enabled())
300 : __tick_nohz_task_switch();
301 : }
302 :
303 : #endif
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