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 | #ifdef CONFIG_GENERIC_CLOCKEVENTS |
72 | extern int tick_broadcast_oneshot_control(enum tick_broadcast_state state); |
73 | #else |
74 | static inline int tick_broadcast_oneshot_control(enum tick_broadcast_state state) |
75 | { |
76 | return 0; |
77 | } |
78 | #endif |
79 | |
80 | static inline void tick_broadcast_enable(void) |
81 | { |
82 | tick_broadcast_control(TICK_BROADCAST_ON); |
83 | } |
84 | static inline void tick_broadcast_disable(void) |
85 | { |
86 | tick_broadcast_control(TICK_BROADCAST_OFF); |
87 | } |
88 | static inline void tick_broadcast_force(void) |
89 | { |
90 | tick_broadcast_control(TICK_BROADCAST_FORCE); |
91 | } |
92 | static inline int tick_broadcast_enter(void) |
93 | { |
94 | return tick_broadcast_oneshot_control(TICK_BROADCAST_ENTER); |
95 | } |
96 | static inline void tick_broadcast_exit(void) |
97 | { |
98 | tick_broadcast_oneshot_control(TICK_BROADCAST_EXIT); |
99 | } |
100 | |
101 | enum 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 |
115 | extern bool tick_nohz_enabled; |
116 | extern bool tick_nohz_tick_stopped(void); |
117 | extern bool tick_nohz_tick_stopped_cpu(int cpu); |
118 | extern void tick_nohz_idle_stop_tick(void); |
119 | extern void tick_nohz_idle_retain_tick(void); |
120 | extern void tick_nohz_idle_restart_tick(void); |
121 | extern void tick_nohz_idle_enter(void); |
122 | extern void tick_nohz_idle_exit(void); |
123 | extern void tick_nohz_irq_exit(void); |
124 | extern bool tick_nohz_idle_got_tick(void); |
125 | extern ktime_t tick_nohz_get_sleep_length(ktime_t *delta_next); |
126 | extern unsigned long tick_nohz_get_idle_calls(void); |
127 | extern unsigned long tick_nohz_get_idle_calls_cpu(int cpu); |
128 | extern u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time); |
129 | extern u64 get_cpu_iowait_time_us(int cpu, u64 *last_update_time); |
130 | |
131 | static 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) |
140 | static inline int tick_nohz_tick_stopped(void) { return 0; } |
141 | static inline int tick_nohz_tick_stopped_cpu(int cpu) { return 0; } |
142 | static inline void tick_nohz_idle_stop_tick(void) { } |
143 | static inline void tick_nohz_idle_retain_tick(void) { } |
144 | static inline void tick_nohz_idle_restart_tick(void) { } |
145 | static inline void tick_nohz_idle_enter(void) { } |
146 | static inline void tick_nohz_idle_exit(void) { } |
147 | static inline bool tick_nohz_idle_got_tick(void) { return false; } |
148 | |
149 | static inline ktime_t tick_nohz_get_sleep_length(ktime_t *delta_next) |
150 | { |
151 | *delta_next = TICK_NSEC; |
152 | return *delta_next; |
153 | } |
154 | static inline u64 get_cpu_idle_time_us(int cpu, u64 *unused) { return -1; } |
155 | static inline u64 get_cpu_iowait_time_us(int cpu, u64 *unused) { return -1; } |
156 | |
157 | static inline void tick_nohz_idle_stop_tick_protected(void) { } |
158 | #endif /* !CONFIG_NO_HZ_COMMON */ |
159 | |
160 | #ifdef CONFIG_NO_HZ_FULL |
161 | extern bool tick_nohz_full_running; |
162 | extern cpumask_var_t tick_nohz_full_mask; |
163 | |
164 | static 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 | |
172 | static 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 | |
180 | static 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 | |
186 | extern void tick_nohz_dep_set(enum tick_dep_bits bit); |
187 | extern void tick_nohz_dep_clear(enum tick_dep_bits bit); |
188 | extern void tick_nohz_dep_set_cpu(int cpu, enum tick_dep_bits bit); |
189 | extern void tick_nohz_dep_clear_cpu(int cpu, enum tick_dep_bits bit); |
190 | extern void tick_nohz_dep_set_task(struct task_struct *tsk, |
191 | enum tick_dep_bits bit); |
192 | extern void tick_nohz_dep_clear_task(struct task_struct *tsk, |
193 | enum tick_dep_bits bit); |
194 | extern void tick_nohz_dep_set_signal(struct signal_struct *signal, |
195 | enum tick_dep_bits bit); |
196 | extern 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 | */ |
203 | static 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 | |
209 | static 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 | |
215 | static 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 | |
221 | static 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 | |
227 | static 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 | } |
233 | static 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 | } |
239 | static 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 | } |
245 | static 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 | |
252 | extern void tick_nohz_full_kick_cpu(int cpu); |
253 | extern void __tick_nohz_task_switch(void); |
254 | extern void __init tick_nohz_full_setup(cpumask_var_t cpumask); |
255 | #else |
256 | static inline bool tick_nohz_full_enabled(void) { return false; } |
257 | static inline bool tick_nohz_full_cpu(int cpu) { return false; } |
258 | static inline void tick_nohz_full_add_cpus_to(struct cpumask *mask) { } |
259 | |
260 | static inline void tick_dep_set(enum tick_dep_bits bit) { } |
261 | static inline void tick_dep_clear(enum tick_dep_bits bit) { } |
262 | static inline void tick_dep_set_cpu(int cpu, enum tick_dep_bits bit) { } |
263 | static inline void tick_dep_clear_cpu(int cpu, enum tick_dep_bits bit) { } |
264 | static inline void tick_dep_set_task(struct task_struct *tsk, |
265 | enum tick_dep_bits bit) { } |
266 | static inline void tick_dep_clear_task(struct task_struct *tsk, |
267 | enum tick_dep_bits bit) { } |
268 | static inline void tick_dep_set_signal(struct signal_struct *signal, |
269 | enum tick_dep_bits bit) { } |
270 | static inline void tick_dep_clear_signal(struct signal_struct *signal, |
271 | enum tick_dep_bits bit) { } |
272 | |
273 | static inline void tick_nohz_full_kick_cpu(int cpu) { } |
274 | static inline void __tick_nohz_task_switch(void) { } |
275 | static inline void tick_nohz_full_setup(cpumask_var_t cpumask) { } |
276 | #endif |
277 | |
278 | static inline void tick_nohz_task_switch(void) |
279 | { |
280 | if (tick_nohz_full_enabled()) |
281 | __tick_nohz_task_switch(); |
282 | } |
283 | |
284 | #endif |
285 | |