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>
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 */
31 #if defined(CONFIG_GENERIC_CLOCKEVENTS) && defined(CONFIG_SUSPEND)
32 extern void tick_freeze(void);
33 extern void tick_unfreeze(void);
35 static inline void tick_freeze(void) { }
36 static inline void tick_unfreeze(void) { }
39 #ifdef CONFIG_TICK_ONESHOT
40 extern void tick_irq_enter(void);
41 # ifndef arch_needs_cpu
42 # define arch_needs_cpu() (0)
45 static inline void tick_irq_enter(void) { }
48 #if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT)
49 extern void hotplug_cpu__broadcast_tick_pull(int dead_cpu);
51 static inline void hotplug_cpu__broadcast_tick_pull(int dead_cpu) { }
54 enum tick_broadcast_mode {
60 enum tick_broadcast_state {
65 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
66 extern void tick_broadcast_control(enum tick_broadcast_mode mode);
68 static inline void tick_broadcast_control(enum tick_broadcast_mode mode) { }
69 #endif /* BROADCAST */
71 #ifdef CONFIG_GENERIC_CLOCKEVENTS
72 extern int tick_broadcast_oneshot_control(enum tick_broadcast_state state);
74 static inline int tick_broadcast_oneshot_control(enum tick_broadcast_state state)
80 static inline void tick_broadcast_enable(void)
82 tick_broadcast_control(TICK_BROADCAST_ON);
84 static inline void tick_broadcast_disable(void)
86 tick_broadcast_control(TICK_BROADCAST_OFF);
88 static inline void tick_broadcast_force(void)
90 tick_broadcast_control(TICK_BROADCAST_FORCE);
92 static inline int tick_broadcast_enter(void)
94 return tick_broadcast_oneshot_control(TICK_BROADCAST_ENTER);
96 static inline void tick_broadcast_exit(void)
98 tick_broadcast_oneshot_control(TICK_BROADCAST_EXIT);
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
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)
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);
131 static inline void tick_nohz_idle_stop_tick_protected(void)
134 tick_nohz_idle_stop_tick();
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; }
149 static inline ktime_t tick_nohz_get_sleep_length(ktime_t *delta_next)
151 *delta_next = TICK_NSEC;
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; }
157 static inline void tick_nohz_idle_stop_tick_protected(void) { }
158 #endif /* !CONFIG_NO_HZ_COMMON */
160 #ifdef CONFIG_NO_HZ_FULL
161 extern bool tick_nohz_full_running;
162 extern cpumask_var_t tick_nohz_full_mask;
164 static inline bool tick_nohz_full_enabled(void)
166 if (!context_tracking_is_enabled())
169 return tick_nohz_full_running;
172 static inline bool tick_nohz_full_cpu(int cpu)
174 if (!tick_nohz_full_enabled())
177 return cpumask_test_cpu(cpu, tick_nohz_full_mask);
180 static inline void tick_nohz_full_add_cpus_to(struct cpumask *mask)
182 if (tick_nohz_full_enabled())
183 cpumask_or(mask, mask, tick_nohz_full_mask);
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);
200 * The below are tick_nohz_[set,clear]_dep() wrappers that optimize off-cases
201 * on top of static keys.
203 static inline void tick_dep_set(enum tick_dep_bits bit)
205 if (tick_nohz_full_enabled())
206 tick_nohz_dep_set(bit);
209 static inline void tick_dep_clear(enum tick_dep_bits bit)
211 if (tick_nohz_full_enabled())
212 tick_nohz_dep_clear(bit);
215 static inline void tick_dep_set_cpu(int cpu, enum tick_dep_bits bit)
217 if (tick_nohz_full_cpu(cpu))
218 tick_nohz_dep_set_cpu(cpu, bit);
221 static inline void tick_dep_clear_cpu(int cpu, enum tick_dep_bits bit)
223 if (tick_nohz_full_cpu(cpu))
224 tick_nohz_dep_clear_cpu(cpu, bit);
227 static inline void tick_dep_set_task(struct task_struct *tsk,
228 enum tick_dep_bits bit)
230 if (tick_nohz_full_enabled())
231 tick_nohz_dep_set_task(tsk, bit);
233 static inline void tick_dep_clear_task(struct task_struct *tsk,
234 enum tick_dep_bits bit)
236 if (tick_nohz_full_enabled())
237 tick_nohz_dep_clear_task(tsk, bit);
239 static inline void tick_dep_set_signal(struct signal_struct *signal,
240 enum tick_dep_bits bit)
242 if (tick_nohz_full_enabled())
243 tick_nohz_dep_set_signal(signal, bit);
245 static inline void tick_dep_clear_signal(struct signal_struct *signal,
246 enum tick_dep_bits bit)
248 if (tick_nohz_full_enabled())
249 tick_nohz_dep_clear_signal(signal, bit);
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);
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) { }
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) { }
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) { }
278 static inline void tick_nohz_task_switch(void)
280 if (tick_nohz_full_enabled())
281 __tick_nohz_task_switch();