Commit | Line | Data |
---|---|---|
b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
c1797baf TG |
2 | /* |
3 | * Tick related global functions | |
906568c9 TG |
4 | */ |
5 | #ifndef _LINUX_TICK_H | |
6 | #define _LINUX_TICK_H | |
7 | ||
8 | #include <linux/clockchips.h> | |
2bbb6817 | 9 | #include <linux/irqflags.h> |
33a5f626 | 10 | #include <linux/percpu.h> |
460775df FW |
11 | #include <linux/context_tracking_state.h> |
12 | #include <linux/cpumask.h> | |
c0f489d2 | 13 | #include <linux/sched.h> |
f268c373 | 14 | #include <linux/rcupdate.h> |
906568c9 | 15 | |
c1797baf TG |
16 | #ifdef CONFIG_GENERIC_CLOCKEVENTS |
17 | extern void __init tick_init(void); | |
7270d11c TG |
18 | /* Should be core only, but ARM BL switcher requires it */ |
19 | extern void tick_suspend_local(void); | |
20 | /* Should be core only, but XEN resume magic and ARM BL switcher require it */ | |
f46481d0 | 21 | extern void tick_resume_local(void); |
52c063d1 | 22 | extern void tick_handover_do_timer(void); |
a49b116d | 23 | extern void tick_cleanup_dead_cpu(int cpu); |
c1797baf TG |
24 | #else /* CONFIG_GENERIC_CLOCKEVENTS */ |
25 | static inline void tick_init(void) { } | |
7270d11c | 26 | static inline void tick_suspend_local(void) { } |
f46481d0 | 27 | static inline void tick_resume_local(void) { } |
52c063d1 | 28 | static inline void tick_handover_do_timer(void) { } |
a49b116d | 29 | static inline void tick_cleanup_dead_cpu(int cpu) { } |
c1797baf | 30 | #endif /* !CONFIG_GENERIC_CLOCKEVENTS */ |
124cf911 | 31 | |
87e9b9f1 RW |
32 | #if defined(CONFIG_GENERIC_CLOCKEVENTS) && defined(CONFIG_SUSPEND) |
33 | extern void tick_freeze(void); | |
34 | extern void tick_unfreeze(void); | |
35 | #else | |
36 | static inline void tick_freeze(void) { } | |
37 | static inline void tick_unfreeze(void) { } | |
38 | #endif | |
39 | ||
c1797baf | 40 | #ifdef CONFIG_TICK_ONESHOT |
5acac1be | 41 | extern void tick_irq_enter(void); |
3c5d92a0 | 42 | # ifndef arch_needs_cpu |
fe0f4976 | 43 | # define arch_needs_cpu() (0) |
3c5d92a0 | 44 | # endif |
79bf2bb3 | 45 | # else |
5acac1be | 46 | static inline void tick_irq_enter(void) { } |
c1797baf | 47 | #endif |
33a5f626 | 48 | |
345527b1 PM |
49 | #if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT) |
50 | extern void hotplug_cpu__broadcast_tick_pull(int dead_cpu); | |
51 | #else | |
52 | static inline void hotplug_cpu__broadcast_tick_pull(int dead_cpu) { } | |
53 | #endif | |
54 | ||
592a438f TG |
55 | enum tick_broadcast_mode { |
56 | TICK_BROADCAST_OFF, | |
57 | TICK_BROADCAST_ON, | |
58 | TICK_BROADCAST_FORCE, | |
59 | }; | |
60 | ||
1fe5d5c3 TG |
61 | enum tick_broadcast_state { |
62 | TICK_BROADCAST_EXIT, | |
63 | TICK_BROADCAST_ENTER, | |
64 | }; | |
65 | ||
592a438f TG |
66 | #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST |
67 | extern void tick_broadcast_control(enum tick_broadcast_mode mode); | |
68 | #else | |
69 | static inline void tick_broadcast_control(enum tick_broadcast_mode mode) { } | |
70 | #endif /* BROADCAST */ | |
71 | ||
1b72d432 TG |
72 | #if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_HOTPLUG_CPU) |
73 | extern void tick_offline_cpu(unsigned int cpu); | |
74 | #else | |
75 | static inline void tick_offline_cpu(unsigned int cpu) { } | |
76 | #endif | |
77 | ||
37b64a42 | 78 | #ifdef CONFIG_GENERIC_CLOCKEVENTS |
1fe5d5c3 | 79 | extern int tick_broadcast_oneshot_control(enum tick_broadcast_state state); |
37b64a42 TG |
80 | #else |
81 | static inline int tick_broadcast_oneshot_control(enum tick_broadcast_state state) | |
82 | { | |
83 | return 0; | |
84 | } | |
85 | #endif | |
1fe5d5c3 | 86 | |
592a438f TG |
87 | static inline void tick_broadcast_enable(void) |
88 | { | |
89 | tick_broadcast_control(TICK_BROADCAST_ON); | |
90 | } | |
91 | static inline void tick_broadcast_disable(void) | |
92 | { | |
93 | tick_broadcast_control(TICK_BROADCAST_OFF); | |
94 | } | |
95 | static inline void tick_broadcast_force(void) | |
96 | { | |
97 | tick_broadcast_control(TICK_BROADCAST_FORCE); | |
98 | } | |
1fe5d5c3 TG |
99 | static inline int tick_broadcast_enter(void) |
100 | { | |
101 | return tick_broadcast_oneshot_control(TICK_BROADCAST_ENTER); | |
102 | } | |
103 | static inline void tick_broadcast_exit(void) | |
104 | { | |
105 | tick_broadcast_oneshot_control(TICK_BROADCAST_EXIT); | |
106 | } | |
592a438f | 107 | |
d027d45d FW |
108 | enum tick_dep_bits { |
109 | TICK_DEP_BIT_POSIX_TIMER = 0, | |
110 | TICK_DEP_BIT_PERF_EVENTS = 1, | |
111 | TICK_DEP_BIT_SCHED = 2, | |
01b4c399 | 112 | TICK_DEP_BIT_CLOCK_UNSTABLE = 3, |
df1e849a PM |
113 | TICK_DEP_BIT_RCU = 4, |
114 | TICK_DEP_BIT_RCU_EXP = 5 | |
d027d45d | 115 | }; |
df1e849a | 116 | #define TICK_DEP_BIT_MAX TICK_DEP_BIT_RCU_EXP |
d027d45d | 117 | |
e6e6cc22 | 118 | #define TICK_DEP_MASK_NONE 0 |
d027d45d FW |
119 | #define TICK_DEP_MASK_POSIX_TIMER (1 << TICK_DEP_BIT_POSIX_TIMER) |
120 | #define TICK_DEP_MASK_PERF_EVENTS (1 << TICK_DEP_BIT_PERF_EVENTS) | |
121 | #define TICK_DEP_MASK_SCHED (1 << TICK_DEP_BIT_SCHED) | |
122 | #define TICK_DEP_MASK_CLOCK_UNSTABLE (1 << TICK_DEP_BIT_CLOCK_UNSTABLE) | |
01b4c399 | 123 | #define TICK_DEP_MASK_RCU (1 << TICK_DEP_BIT_RCU) |
df1e849a | 124 | #define TICK_DEP_MASK_RCU_EXP (1 << TICK_DEP_BIT_RCU_EXP) |
d027d45d | 125 | |
c1797baf | 126 | #ifdef CONFIG_NO_HZ_COMMON |
4cc7ecb7 | 127 | extern bool tick_nohz_enabled; |
a3642983 | 128 | extern bool tick_nohz_tick_stopped(void); |
22ab8bc0 | 129 | extern bool tick_nohz_tick_stopped_cpu(int cpu); |
0e776768 | 130 | extern void tick_nohz_idle_stop_tick(void); |
554c8aa8 | 131 | extern void tick_nohz_idle_retain_tick(void); |
2aaf709a | 132 | extern void tick_nohz_idle_restart_tick(void); |
1268fbc7 | 133 | extern void tick_nohz_idle_enter(void); |
280f0677 FW |
134 | extern void tick_nohz_idle_exit(void); |
135 | extern void tick_nohz_irq_exit(void); | |
45f1ff59 | 136 | extern bool tick_nohz_idle_got_tick(void); |
6f9b83ac | 137 | extern ktime_t tick_nohz_get_next_hrtimer(void); |
296bb1e5 | 138 | extern ktime_t tick_nohz_get_sleep_length(ktime_t *delta_next); |
b7eaf1aa | 139 | extern unsigned long tick_nohz_get_idle_calls(void); |
466a2b42 | 140 | extern unsigned long tick_nohz_get_idle_calls_cpu(int cpu); |
6378ddb5 | 141 | extern u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time); |
0224cf4c | 142 | extern u64 get_cpu_iowait_time_us(int cpu, u64 *last_update_time); |
0e776768 RW |
143 | |
144 | static inline void tick_nohz_idle_stop_tick_protected(void) | |
145 | { | |
146 | local_irq_disable(); | |
147 | tick_nohz_idle_stop_tick(); | |
148 | local_irq_enable(); | |
149 | } | |
150 | ||
c1797baf | 151 | #else /* !CONFIG_NO_HZ_COMMON */ |
46373a15 | 152 | #define tick_nohz_enabled (0) |
c1797baf | 153 | static inline int tick_nohz_tick_stopped(void) { return 0; } |
22ab8bc0 | 154 | static inline int tick_nohz_tick_stopped_cpu(int cpu) { return 0; } |
0e776768 | 155 | static inline void tick_nohz_idle_stop_tick(void) { } |
554c8aa8 | 156 | static inline void tick_nohz_idle_retain_tick(void) { } |
2aaf709a | 157 | static inline void tick_nohz_idle_restart_tick(void) { } |
2bbb6817 FW |
158 | static inline void tick_nohz_idle_enter(void) { } |
159 | static inline void tick_nohz_idle_exit(void) { } | |
45f1ff59 | 160 | static inline bool tick_nohz_idle_got_tick(void) { return false; } |
6f9b83ac UH |
161 | static inline ktime_t tick_nohz_get_next_hrtimer(void) |
162 | { | |
163 | /* Next wake up is the tick period, assume it starts now */ | |
164 | return ktime_add(ktime_get(), TICK_NSEC); | |
165 | } | |
296bb1e5 | 166 | static inline ktime_t tick_nohz_get_sleep_length(ktime_t *delta_next) |
4f86d3a8 | 167 | { |
296bb1e5 RW |
168 | *delta_next = TICK_NSEC; |
169 | return *delta_next; | |
4f86d3a8 | 170 | } |
8083e4ad | 171 | static inline u64 get_cpu_idle_time_us(int cpu, u64 *unused) { return -1; } |
0224cf4c | 172 | static inline u64 get_cpu_iowait_time_us(int cpu, u64 *unused) { return -1; } |
0e776768 RW |
173 | |
174 | static inline void tick_nohz_idle_stop_tick_protected(void) { } | |
c1797baf | 175 | #endif /* !CONFIG_NO_HZ_COMMON */ |
906568c9 | 176 | |
c5bfece2 | 177 | #ifdef CONFIG_NO_HZ_FULL |
460775df FW |
178 | extern bool tick_nohz_full_running; |
179 | extern cpumask_var_t tick_nohz_full_mask; | |
180 | ||
181 | static inline bool tick_nohz_full_enabled(void) | |
182 | { | |
74c57875 | 183 | if (!context_tracking_enabled()) |
460775df FW |
184 | return false; |
185 | ||
186 | return tick_nohz_full_running; | |
187 | } | |
188 | ||
f105dfec PZ |
189 | /* |
190 | * Check if a CPU is part of the nohz_full subset. Arrange for evaluating | |
191 | * the cpu expression (typically smp_processor_id()) _after_ the static | |
192 | * key. | |
193 | */ | |
194 | #define tick_nohz_full_cpu(_cpu) ({ \ | |
195 | bool __ret = false; \ | |
196 | if (tick_nohz_full_enabled()) \ | |
197 | __ret = cpumask_test_cpu((_cpu), tick_nohz_full_mask); \ | |
198 | __ret; \ | |
199 | }) | |
460775df | 200 | |
83dedea8 CM |
201 | static inline void tick_nohz_full_add_cpus_to(struct cpumask *mask) |
202 | { | |
203 | if (tick_nohz_full_enabled()) | |
204 | cpumask_or(mask, mask, tick_nohz_full_mask); | |
205 | } | |
206 | ||
d027d45d FW |
207 | extern void tick_nohz_dep_set(enum tick_dep_bits bit); |
208 | extern void tick_nohz_dep_clear(enum tick_dep_bits bit); | |
209 | extern void tick_nohz_dep_set_cpu(int cpu, enum tick_dep_bits bit); | |
210 | extern void tick_nohz_dep_clear_cpu(int cpu, enum tick_dep_bits bit); | |
211 | extern void tick_nohz_dep_set_task(struct task_struct *tsk, | |
212 | enum tick_dep_bits bit); | |
213 | extern void tick_nohz_dep_clear_task(struct task_struct *tsk, | |
214 | enum tick_dep_bits bit); | |
1e4ca26d | 215 | extern void tick_nohz_dep_set_signal(struct task_struct *tsk, |
d027d45d FW |
216 | enum tick_dep_bits bit); |
217 | extern void tick_nohz_dep_clear_signal(struct signal_struct *signal, | |
218 | enum tick_dep_bits bit); | |
219 | ||
220 | /* | |
221 | * The below are tick_nohz_[set,clear]_dep() wrappers that optimize off-cases | |
222 | * on top of static keys. | |
223 | */ | |
224 | static inline void tick_dep_set(enum tick_dep_bits bit) | |
225 | { | |
226 | if (tick_nohz_full_enabled()) | |
227 | tick_nohz_dep_set(bit); | |
228 | } | |
229 | ||
230 | static inline void tick_dep_clear(enum tick_dep_bits bit) | |
231 | { | |
232 | if (tick_nohz_full_enabled()) | |
233 | tick_nohz_dep_clear(bit); | |
234 | } | |
235 | ||
236 | static inline void tick_dep_set_cpu(int cpu, enum tick_dep_bits bit) | |
237 | { | |
238 | if (tick_nohz_full_cpu(cpu)) | |
239 | tick_nohz_dep_set_cpu(cpu, bit); | |
240 | } | |
241 | ||
242 | static inline void tick_dep_clear_cpu(int cpu, enum tick_dep_bits bit) | |
243 | { | |
244 | if (tick_nohz_full_cpu(cpu)) | |
245 | tick_nohz_dep_clear_cpu(cpu, bit); | |
246 | } | |
247 | ||
248 | static inline void tick_dep_set_task(struct task_struct *tsk, | |
249 | enum tick_dep_bits bit) | |
250 | { | |
251 | if (tick_nohz_full_enabled()) | |
252 | tick_nohz_dep_set_task(tsk, bit); | |
253 | } | |
254 | static inline void tick_dep_clear_task(struct task_struct *tsk, | |
255 | enum tick_dep_bits bit) | |
256 | { | |
257 | if (tick_nohz_full_enabled()) | |
258 | tick_nohz_dep_clear_task(tsk, bit); | |
259 | } | |
1e4ca26d | 260 | static inline void tick_dep_set_signal(struct task_struct *tsk, |
d027d45d FW |
261 | enum tick_dep_bits bit) |
262 | { | |
263 | if (tick_nohz_full_enabled()) | |
1e4ca26d | 264 | tick_nohz_dep_set_signal(tsk, bit); |
d027d45d FW |
265 | } |
266 | static inline void tick_dep_clear_signal(struct signal_struct *signal, | |
267 | enum tick_dep_bits bit) | |
268 | { | |
269 | if (tick_nohz_full_enabled()) | |
270 | tick_nohz_dep_clear_signal(signal, bit); | |
271 | } | |
272 | ||
3d36aebc | 273 | extern void tick_nohz_full_kick_cpu(int cpu); |
de734f89 | 274 | extern void __tick_nohz_task_switch(void); |
6f1982fe | 275 | extern void __init tick_nohz_full_setup(cpumask_var_t cpumask); |
a831881b | 276 | #else |
460775df FW |
277 | static inline bool tick_nohz_full_enabled(void) { return false; } |
278 | static inline bool tick_nohz_full_cpu(int cpu) { return false; } | |
83dedea8 | 279 | static inline void tick_nohz_full_add_cpus_to(struct cpumask *mask) { } |
d027d45d | 280 | |
01b4c399 FW |
281 | static inline void tick_nohz_dep_set_cpu(int cpu, enum tick_dep_bits bit) { } |
282 | static inline void tick_nohz_dep_clear_cpu(int cpu, enum tick_dep_bits bit) { } | |
283 | ||
d027d45d FW |
284 | static inline void tick_dep_set(enum tick_dep_bits bit) { } |
285 | static inline void tick_dep_clear(enum tick_dep_bits bit) { } | |
286 | static inline void tick_dep_set_cpu(int cpu, enum tick_dep_bits bit) { } | |
287 | static inline void tick_dep_clear_cpu(int cpu, enum tick_dep_bits bit) { } | |
288 | static inline void tick_dep_set_task(struct task_struct *tsk, | |
289 | enum tick_dep_bits bit) { } | |
290 | static inline void tick_dep_clear_task(struct task_struct *tsk, | |
291 | enum tick_dep_bits bit) { } | |
1e4ca26d | 292 | static inline void tick_dep_set_signal(struct task_struct *tsk, |
d027d45d FW |
293 | enum tick_dep_bits bit) { } |
294 | static inline void tick_dep_clear_signal(struct signal_struct *signal, | |
295 | enum tick_dep_bits bit) { } | |
296 | ||
3d36aebc | 297 | static inline void tick_nohz_full_kick_cpu(int cpu) { } |
de734f89 | 298 | static inline void __tick_nohz_task_switch(void) { } |
6f1982fe | 299 | static inline void tick_nohz_full_setup(cpumask_var_t cpumask) { } |
a831881b FW |
300 | #endif |
301 | ||
de734f89 | 302 | static inline void tick_nohz_task_switch(void) |
d13508f9 FW |
303 | { |
304 | if (tick_nohz_full_enabled()) | |
de734f89 | 305 | __tick_nohz_task_switch(); |
d13508f9 FW |
306 | } |
307 | ||
f268c373 FW |
308 | static inline void tick_nohz_user_enter_prepare(void) |
309 | { | |
310 | if (tick_nohz_full_cpu(smp_processor_id())) | |
311 | rcu_nocb_flush_deferred_wakeup(); | |
312 | } | |
313 | ||
906568c9 | 314 | #endif |