1 /* SPDX-License-Identifier: GPL-2.0 */
3 * Tick related global functions
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 #include <linux/rcupdate.h>
16 #ifdef CONFIG_GENERIC_CLOCKEVENTS
17 extern void __init tick_init(void);
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 */
21 extern void tick_resume_local(void);
22 extern void tick_handover_do_timer(void);
23 extern void tick_cleanup_dead_cpu(int cpu);
24 #else /* CONFIG_GENERIC_CLOCKEVENTS */
25 static inline void tick_init(void) { }
26 static inline void tick_suspend_local(void) { }
27 static inline void tick_resume_local(void) { }
28 static inline void tick_handover_do_timer(void) { }
29 static inline void tick_cleanup_dead_cpu(int cpu) { }
30 #endif /* !CONFIG_GENERIC_CLOCKEVENTS */
32 #if defined(CONFIG_GENERIC_CLOCKEVENTS) && defined(CONFIG_SUSPEND)
33 extern void tick_freeze(void);
34 extern void tick_unfreeze(void);
36 static inline void tick_freeze(void) { }
37 static inline void tick_unfreeze(void) { }
40 #ifdef CONFIG_TICK_ONESHOT
41 extern void tick_irq_enter(void);
42 # ifndef arch_needs_cpu
43 # define arch_needs_cpu() (0)
46 static inline void tick_irq_enter(void) { }
49 #if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT)
50 extern void hotplug_cpu__broadcast_tick_pull(int dead_cpu);
52 static inline void hotplug_cpu__broadcast_tick_pull(int dead_cpu) { }
55 enum tick_broadcast_mode {
61 enum tick_broadcast_state {
66 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
67 extern void tick_broadcast_control(enum tick_broadcast_mode mode);
69 static inline void tick_broadcast_control(enum tick_broadcast_mode mode) { }
70 #endif /* BROADCAST */
72 #if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_HOTPLUG_CPU)
73 extern void tick_offline_cpu(unsigned int cpu);
75 static inline void tick_offline_cpu(unsigned int cpu) { }
78 #ifdef CONFIG_GENERIC_CLOCKEVENTS
79 extern int tick_broadcast_oneshot_control(enum tick_broadcast_state state);
81 static inline int tick_broadcast_oneshot_control(enum tick_broadcast_state state)
87 static inline void tick_broadcast_enable(void)
89 tick_broadcast_control(TICK_BROADCAST_ON);
91 static inline void tick_broadcast_disable(void)
93 tick_broadcast_control(TICK_BROADCAST_OFF);
95 static inline void tick_broadcast_force(void)
97 tick_broadcast_control(TICK_BROADCAST_FORCE);
99 static inline int tick_broadcast_enter(void)
101 return tick_broadcast_oneshot_control(TICK_BROADCAST_ENTER);
103 static inline void tick_broadcast_exit(void)
105 tick_broadcast_oneshot_control(TICK_BROADCAST_EXIT);
109 TICK_DEP_BIT_POSIX_TIMER = 0,
110 TICK_DEP_BIT_PERF_EVENTS = 1,
111 TICK_DEP_BIT_SCHED = 2,
112 TICK_DEP_BIT_CLOCK_UNSTABLE = 3,
113 TICK_DEP_BIT_RCU = 4,
114 TICK_DEP_BIT_RCU_EXP = 5
116 #define TICK_DEP_BIT_MAX TICK_DEP_BIT_RCU_EXP
118 #define TICK_DEP_MASK_NONE 0
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)
123 #define TICK_DEP_MASK_RCU (1 << TICK_DEP_BIT_RCU)
124 #define TICK_DEP_MASK_RCU_EXP (1 << TICK_DEP_BIT_RCU_EXP)
126 #ifdef CONFIG_NO_HZ_COMMON
127 extern bool tick_nohz_enabled;
128 extern bool tick_nohz_tick_stopped(void);
129 extern bool tick_nohz_tick_stopped_cpu(int cpu);
130 extern void tick_nohz_idle_stop_tick(void);
131 extern void tick_nohz_idle_retain_tick(void);
132 extern void tick_nohz_idle_restart_tick(void);
133 extern void tick_nohz_idle_enter(void);
134 extern void tick_nohz_idle_exit(void);
135 extern void tick_nohz_irq_exit(void);
136 extern bool tick_nohz_idle_got_tick(void);
137 extern ktime_t tick_nohz_get_next_hrtimer(void);
138 extern ktime_t tick_nohz_get_sleep_length(ktime_t *delta_next);
139 extern unsigned long tick_nohz_get_idle_calls(void);
140 extern unsigned long tick_nohz_get_idle_calls_cpu(int cpu);
141 extern u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time);
142 extern u64 get_cpu_iowait_time_us(int cpu, u64 *last_update_time);
144 static inline void tick_nohz_idle_stop_tick_protected(void)
147 tick_nohz_idle_stop_tick();
151 #else /* !CONFIG_NO_HZ_COMMON */
152 #define tick_nohz_enabled (0)
153 static inline int tick_nohz_tick_stopped(void) { return 0; }
154 static inline int tick_nohz_tick_stopped_cpu(int cpu) { return 0; }
155 static inline void tick_nohz_idle_stop_tick(void) { }
156 static inline void tick_nohz_idle_retain_tick(void) { }
157 static inline void tick_nohz_idle_restart_tick(void) { }
158 static inline void tick_nohz_idle_enter(void) { }
159 static inline void tick_nohz_idle_exit(void) { }
160 static inline bool tick_nohz_idle_got_tick(void) { return false; }
161 static inline ktime_t tick_nohz_get_next_hrtimer(void)
163 /* Next wake up is the tick period, assume it starts now */
164 return ktime_add(ktime_get(), TICK_NSEC);
166 static inline ktime_t tick_nohz_get_sleep_length(ktime_t *delta_next)
168 *delta_next = TICK_NSEC;
171 static inline u64 get_cpu_idle_time_us(int cpu, u64 *unused) { return -1; }
172 static inline u64 get_cpu_iowait_time_us(int cpu, u64 *unused) { return -1; }
174 static inline void tick_nohz_idle_stop_tick_protected(void) { }
175 #endif /* !CONFIG_NO_HZ_COMMON */
177 #ifdef CONFIG_NO_HZ_FULL
178 extern bool tick_nohz_full_running;
179 extern cpumask_var_t tick_nohz_full_mask;
181 static inline bool tick_nohz_full_enabled(void)
183 if (!context_tracking_enabled())
186 return tick_nohz_full_running;
189 static inline bool tick_nohz_full_cpu(int cpu)
191 if (!tick_nohz_full_enabled())
194 return cpumask_test_cpu(cpu, tick_nohz_full_mask);
197 static inline void tick_nohz_full_add_cpus_to(struct cpumask *mask)
199 if (tick_nohz_full_enabled())
200 cpumask_or(mask, mask, tick_nohz_full_mask);
203 extern void tick_nohz_dep_set(enum tick_dep_bits bit);
204 extern void tick_nohz_dep_clear(enum tick_dep_bits bit);
205 extern void tick_nohz_dep_set_cpu(int cpu, enum tick_dep_bits bit);
206 extern void tick_nohz_dep_clear_cpu(int cpu, enum tick_dep_bits bit);
207 extern void tick_nohz_dep_set_task(struct task_struct *tsk,
208 enum tick_dep_bits bit);
209 extern void tick_nohz_dep_clear_task(struct task_struct *tsk,
210 enum tick_dep_bits bit);
211 extern void tick_nohz_dep_set_signal(struct signal_struct *signal,
212 enum tick_dep_bits bit);
213 extern void tick_nohz_dep_clear_signal(struct signal_struct *signal,
214 enum tick_dep_bits bit);
217 * The below are tick_nohz_[set,clear]_dep() wrappers that optimize off-cases
218 * on top of static keys.
220 static inline void tick_dep_set(enum tick_dep_bits bit)
222 if (tick_nohz_full_enabled())
223 tick_nohz_dep_set(bit);
226 static inline void tick_dep_clear(enum tick_dep_bits bit)
228 if (tick_nohz_full_enabled())
229 tick_nohz_dep_clear(bit);
232 static inline void tick_dep_set_cpu(int cpu, enum tick_dep_bits bit)
234 if (tick_nohz_full_cpu(cpu))
235 tick_nohz_dep_set_cpu(cpu, bit);
238 static inline void tick_dep_clear_cpu(int cpu, enum tick_dep_bits bit)
240 if (tick_nohz_full_cpu(cpu))
241 tick_nohz_dep_clear_cpu(cpu, bit);
244 static inline void tick_dep_set_task(struct task_struct *tsk,
245 enum tick_dep_bits bit)
247 if (tick_nohz_full_enabled())
248 tick_nohz_dep_set_task(tsk, bit);
250 static inline void tick_dep_clear_task(struct task_struct *tsk,
251 enum tick_dep_bits bit)
253 if (tick_nohz_full_enabled())
254 tick_nohz_dep_clear_task(tsk, bit);
256 static inline void tick_dep_set_signal(struct signal_struct *signal,
257 enum tick_dep_bits bit)
259 if (tick_nohz_full_enabled())
260 tick_nohz_dep_set_signal(signal, bit);
262 static inline void tick_dep_clear_signal(struct signal_struct *signal,
263 enum tick_dep_bits bit)
265 if (tick_nohz_full_enabled())
266 tick_nohz_dep_clear_signal(signal, bit);
269 extern void tick_nohz_full_kick_cpu(int cpu);
270 extern void __tick_nohz_task_switch(void);
271 extern void __init tick_nohz_full_setup(cpumask_var_t cpumask);
273 static inline bool tick_nohz_full_enabled(void) { return false; }
274 static inline bool tick_nohz_full_cpu(int cpu) { return false; }
275 static inline void tick_nohz_full_add_cpus_to(struct cpumask *mask) { }
277 static inline void tick_nohz_dep_set_cpu(int cpu, enum tick_dep_bits bit) { }
278 static inline void tick_nohz_dep_clear_cpu(int cpu, enum tick_dep_bits bit) { }
280 static inline void tick_dep_set(enum tick_dep_bits bit) { }
281 static inline void tick_dep_clear(enum tick_dep_bits bit) { }
282 static inline void tick_dep_set_cpu(int cpu, enum tick_dep_bits bit) { }
283 static inline void tick_dep_clear_cpu(int cpu, enum tick_dep_bits bit) { }
284 static inline void tick_dep_set_task(struct task_struct *tsk,
285 enum tick_dep_bits bit) { }
286 static inline void tick_dep_clear_task(struct task_struct *tsk,
287 enum tick_dep_bits bit) { }
288 static inline void tick_dep_set_signal(struct signal_struct *signal,
289 enum tick_dep_bits bit) { }
290 static inline void tick_dep_clear_signal(struct signal_struct *signal,
291 enum tick_dep_bits bit) { }
293 static inline void tick_nohz_full_kick_cpu(int cpu) { }
294 static inline void __tick_nohz_task_switch(void) { }
295 static inline void tick_nohz_full_setup(cpumask_var_t cpumask) { }
298 static inline void tick_nohz_task_switch(void)
300 if (tick_nohz_full_enabled())
301 __tick_nohz_task_switch();
304 static inline void tick_nohz_user_enter_prepare(void)
306 if (tick_nohz_full_cpu(smp_processor_id()))
307 rcu_nocb_flush_deferred_wakeup();