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
15 extern void __init tick_init(void);
16 /* Should be core only, but ARM BL switcher requires it */
17 extern void tick_suspend_local(void);
18 /* Should be core only, but XEN resume magic and ARM BL switcher require it */
19 extern void tick_resume_local(void);
20 extern void tick_handover_do_timer(void);
21 extern void tick_cleanup_dead_cpu(int cpu);
22 #else /* CONFIG_GENERIC_CLOCKEVENTS */
tick_init(void)23 static inline void tick_init(void) { }
tick_suspend_local(void)24 static inline void tick_suspend_local(void) { }
tick_resume_local(void)25 static inline void tick_resume_local(void) { }
tick_handover_do_timer(void)26 static inline void tick_handover_do_timer(void) { }
tick_cleanup_dead_cpu(int cpu)27 static inline void tick_cleanup_dead_cpu(int cpu) { }
28 #endif /* !CONFIG_GENERIC_CLOCKEVENTS */
29
30 #if defined(CONFIG_GENERIC_CLOCKEVENTS) && defined(CONFIG_SUSPEND)
31 extern void tick_freeze(void);
32 extern void tick_unfreeze(void);
33 #else
tick_freeze(void)34 static inline void tick_freeze(void) { }
tick_unfreeze(void)35 static inline void tick_unfreeze(void) { }
36 #endif
37
38 #ifdef CONFIG_TICK_ONESHOT
39 extern void tick_irq_enter(void);
40 # ifndef arch_needs_cpu
41 # define arch_needs_cpu() (0)
42 # endif
43 # else
tick_irq_enter(void)44 static inline void tick_irq_enter(void) { }
45 #endif
46
47 #if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT)
48 extern void hotplug_cpu__broadcast_tick_pull(int dead_cpu);
49 #else
hotplug_cpu__broadcast_tick_pull(int dead_cpu)50 static inline void hotplug_cpu__broadcast_tick_pull(int dead_cpu) { }
51 #endif
52
53 enum tick_broadcast_mode {
54 TICK_BROADCAST_OFF,
55 TICK_BROADCAST_ON,
56 TICK_BROADCAST_FORCE,
57 };
58
59 enum tick_broadcast_state {
60 TICK_BROADCAST_EXIT,
61 TICK_BROADCAST_ENTER,
62 };
63
64 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
65 extern void tick_broadcast_control(enum tick_broadcast_mode mode);
66 #else
tick_broadcast_control(enum tick_broadcast_mode mode)67 static inline void tick_broadcast_control(enum tick_broadcast_mode mode) { }
68 #endif /* BROADCAST */
69
70 #ifdef CONFIG_GENERIC_CLOCKEVENTS
71 extern int tick_broadcast_oneshot_control(enum tick_broadcast_state state);
72 #else
tick_broadcast_oneshot_control(enum tick_broadcast_state state)73 static inline int tick_broadcast_oneshot_control(enum tick_broadcast_state state)
74 {
75 return 0;
76 }
77 #endif
78
tick_broadcast_enable(void)79 static inline void tick_broadcast_enable(void)
80 {
81 tick_broadcast_control(TICK_BROADCAST_ON);
82 }
tick_broadcast_disable(void)83 static inline void tick_broadcast_disable(void)
84 {
85 tick_broadcast_control(TICK_BROADCAST_OFF);
86 }
tick_broadcast_force(void)87 static inline void tick_broadcast_force(void)
88 {
89 tick_broadcast_control(TICK_BROADCAST_FORCE);
90 }
tick_broadcast_enter(void)91 static inline int tick_broadcast_enter(void)
92 {
93 return tick_broadcast_oneshot_control(TICK_BROADCAST_ENTER);
94 }
tick_broadcast_exit(void)95 static inline void tick_broadcast_exit(void)
96 {
97 tick_broadcast_oneshot_control(TICK_BROADCAST_EXIT);
98 }
99
100 enum 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
114 extern bool tick_nohz_enabled;
115 extern int tick_nohz_tick_stopped(void);
116 extern void tick_nohz_idle_enter(void);
117 extern void tick_nohz_idle_exit(void);
118 extern void tick_nohz_irq_exit(void);
119 extern ktime_t tick_nohz_get_sleep_length(void);
120 extern unsigned long tick_nohz_get_idle_calls(void);
121 extern u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time);
122 extern u64 get_cpu_iowait_time_us(int cpu, u64 *last_update_time);
123 #else /* !CONFIG_NO_HZ_COMMON */
124 #define tick_nohz_enabled (0)
tick_nohz_tick_stopped(void)125 static inline int tick_nohz_tick_stopped(void) { return 0; }
tick_nohz_idle_enter(void)126 static inline void tick_nohz_idle_enter(void) { }
tick_nohz_idle_exit(void)127 static inline void tick_nohz_idle_exit(void) { }
128
tick_nohz_get_sleep_length(void)129 static inline ktime_t tick_nohz_get_sleep_length(void)
130 {
131 ktime_t len = { .tv64 = NSEC_PER_SEC/HZ };
132
133 return len;
134 }
get_cpu_idle_time_us(int cpu,u64 * unused)135 static inline u64 get_cpu_idle_time_us(int cpu, u64 *unused) { return -1; }
get_cpu_iowait_time_us(int cpu,u64 * unused)136 static inline u64 get_cpu_iowait_time_us(int cpu, u64 *unused) { return -1; }
137 #endif /* !CONFIG_NO_HZ_COMMON */
138
139 #ifdef CONFIG_NO_HZ_FULL
140 extern bool tick_nohz_full_running;
141 extern cpumask_var_t tick_nohz_full_mask;
142 extern cpumask_var_t housekeeping_mask;
143
tick_nohz_full_enabled(void)144 static inline bool tick_nohz_full_enabled(void)
145 {
146 if (!context_tracking_is_enabled())
147 return false;
148
149 return tick_nohz_full_running;
150 }
151
tick_nohz_full_cpu(int cpu)152 static inline bool tick_nohz_full_cpu(int cpu)
153 {
154 if (!tick_nohz_full_enabled())
155 return false;
156
157 return cpumask_test_cpu(cpu, tick_nohz_full_mask);
158 }
159
tick_nohz_full_add_cpus_to(struct cpumask * mask)160 static inline void tick_nohz_full_add_cpus_to(struct cpumask *mask)
161 {
162 if (tick_nohz_full_enabled())
163 cpumask_or(mask, mask, tick_nohz_full_mask);
164 }
165
housekeeping_any_cpu(void)166 static inline int housekeeping_any_cpu(void)
167 {
168 return cpumask_any_and(housekeeping_mask, cpu_online_mask);
169 }
170
171 extern void tick_nohz_dep_set(enum tick_dep_bits bit);
172 extern void tick_nohz_dep_clear(enum tick_dep_bits bit);
173 extern void tick_nohz_dep_set_cpu(int cpu, enum tick_dep_bits bit);
174 extern void tick_nohz_dep_clear_cpu(int cpu, enum tick_dep_bits bit);
175 extern void tick_nohz_dep_set_task(struct task_struct *tsk,
176 enum tick_dep_bits bit);
177 extern void tick_nohz_dep_clear_task(struct task_struct *tsk,
178 enum tick_dep_bits bit);
179 extern void tick_nohz_dep_set_signal(struct signal_struct *signal,
180 enum tick_dep_bits bit);
181 extern void tick_nohz_dep_clear_signal(struct signal_struct *signal,
182 enum tick_dep_bits bit);
183
184 /*
185 * The below are tick_nohz_[set,clear]_dep() wrappers that optimize off-cases
186 * on top of static keys.
187 */
tick_dep_set(enum tick_dep_bits bit)188 static inline void tick_dep_set(enum tick_dep_bits bit)
189 {
190 if (tick_nohz_full_enabled())
191 tick_nohz_dep_set(bit);
192 }
193
tick_dep_clear(enum tick_dep_bits bit)194 static inline void tick_dep_clear(enum tick_dep_bits bit)
195 {
196 if (tick_nohz_full_enabled())
197 tick_nohz_dep_clear(bit);
198 }
199
tick_dep_set_cpu(int cpu,enum tick_dep_bits bit)200 static inline void tick_dep_set_cpu(int cpu, enum tick_dep_bits bit)
201 {
202 if (tick_nohz_full_cpu(cpu))
203 tick_nohz_dep_set_cpu(cpu, bit);
204 }
205
tick_dep_clear_cpu(int cpu,enum tick_dep_bits bit)206 static inline void tick_dep_clear_cpu(int cpu, enum tick_dep_bits bit)
207 {
208 if (tick_nohz_full_cpu(cpu))
209 tick_nohz_dep_clear_cpu(cpu, bit);
210 }
211
tick_dep_set_task(struct task_struct * tsk,enum tick_dep_bits bit)212 static inline void tick_dep_set_task(struct task_struct *tsk,
213 enum tick_dep_bits bit)
214 {
215 if (tick_nohz_full_enabled())
216 tick_nohz_dep_set_task(tsk, bit);
217 }
tick_dep_clear_task(struct task_struct * tsk,enum tick_dep_bits bit)218 static inline void tick_dep_clear_task(struct task_struct *tsk,
219 enum tick_dep_bits bit)
220 {
221 if (tick_nohz_full_enabled())
222 tick_nohz_dep_clear_task(tsk, bit);
223 }
tick_dep_set_signal(struct signal_struct * signal,enum tick_dep_bits bit)224 static inline void tick_dep_set_signal(struct signal_struct *signal,
225 enum tick_dep_bits bit)
226 {
227 if (tick_nohz_full_enabled())
228 tick_nohz_dep_set_signal(signal, bit);
229 }
tick_dep_clear_signal(struct signal_struct * signal,enum tick_dep_bits bit)230 static inline void tick_dep_clear_signal(struct signal_struct *signal,
231 enum tick_dep_bits bit)
232 {
233 if (tick_nohz_full_enabled())
234 tick_nohz_dep_clear_signal(signal, bit);
235 }
236
237 extern void tick_nohz_full_kick_cpu(int cpu);
238 extern void __tick_nohz_task_switch(void);
239 #else
housekeeping_any_cpu(void)240 static inline int housekeeping_any_cpu(void)
241 {
242 return smp_processor_id();
243 }
tick_nohz_full_enabled(void)244 static inline bool tick_nohz_full_enabled(void) { return false; }
tick_nohz_full_cpu(int cpu)245 static inline bool tick_nohz_full_cpu(int cpu) { return false; }
tick_nohz_full_add_cpus_to(struct cpumask * mask)246 static inline void tick_nohz_full_add_cpus_to(struct cpumask *mask) { }
247
tick_dep_set(enum tick_dep_bits bit)248 static inline void tick_dep_set(enum tick_dep_bits bit) { }
tick_dep_clear(enum tick_dep_bits bit)249 static inline void tick_dep_clear(enum tick_dep_bits bit) { }
tick_dep_set_cpu(int cpu,enum tick_dep_bits bit)250 static inline void tick_dep_set_cpu(int cpu, enum tick_dep_bits bit) { }
tick_dep_clear_cpu(int cpu,enum tick_dep_bits bit)251 static inline void tick_dep_clear_cpu(int cpu, enum tick_dep_bits bit) { }
tick_dep_set_task(struct task_struct * tsk,enum tick_dep_bits bit)252 static inline void tick_dep_set_task(struct task_struct *tsk,
253 enum tick_dep_bits bit) { }
tick_dep_clear_task(struct task_struct * tsk,enum tick_dep_bits bit)254 static inline void tick_dep_clear_task(struct task_struct *tsk,
255 enum tick_dep_bits bit) { }
tick_dep_set_signal(struct signal_struct * signal,enum tick_dep_bits bit)256 static inline void tick_dep_set_signal(struct signal_struct *signal,
257 enum tick_dep_bits bit) { }
tick_dep_clear_signal(struct signal_struct * signal,enum tick_dep_bits bit)258 static inline void tick_dep_clear_signal(struct signal_struct *signal,
259 enum tick_dep_bits bit) { }
260
tick_nohz_full_kick_cpu(int cpu)261 static inline void tick_nohz_full_kick_cpu(int cpu) { }
__tick_nohz_task_switch(void)262 static inline void __tick_nohz_task_switch(void) { }
263 #endif
264
housekeeping_cpumask(void)265 static inline const struct cpumask *housekeeping_cpumask(void)
266 {
267 #ifdef CONFIG_NO_HZ_FULL
268 if (tick_nohz_full_enabled())
269 return housekeeping_mask;
270 #endif
271 return cpu_possible_mask;
272 }
273
is_housekeeping_cpu(int cpu)274 static inline bool is_housekeeping_cpu(int cpu)
275 {
276 #ifdef CONFIG_NO_HZ_FULL
277 if (tick_nohz_full_enabled())
278 return cpumask_test_cpu(cpu, housekeeping_mask);
279 #endif
280 return true;
281 }
282
housekeeping_affine(struct task_struct * t)283 static inline void housekeeping_affine(struct task_struct *t)
284 {
285 #ifdef CONFIG_NO_HZ_FULL
286 if (tick_nohz_full_enabled())
287 set_cpus_allowed_ptr(t, housekeeping_mask);
288
289 #endif
290 }
291
tick_nohz_task_switch(void)292 static inline void tick_nohz_task_switch(void)
293 {
294 if (tick_nohz_full_enabled())
295 __tick_nohz_task_switch();
296 }
297
298 #endif
299