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 int tick_nohz_tick_stopped(void);
117 extern void tick_nohz_idle_enter(void);
118 extern void tick_nohz_idle_exit(void);
119 extern void tick_nohz_irq_exit(void);
120 extern ktime_t tick_nohz_get_sleep_length(void);
121 extern unsigned long tick_nohz_get_idle_calls(void);
122 extern u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time);
123 extern u64 get_cpu_iowait_time_us(int cpu, u64 *last_update_time);
124 #else /* !CONFIG_NO_HZ_COMMON */
125 #define tick_nohz_enabled (0)
126 static inline int tick_nohz_tick_stopped(void) { return 0; }
127 static inline void tick_nohz_idle_enter(void) { }
128 static inline void tick_nohz_idle_exit(void) { }
130 static inline ktime_t tick_nohz_get_sleep_length(void)
132 return NSEC_PER_SEC / HZ;
134 static inline u64 get_cpu_idle_time_us(int cpu, u64 *unused) { return -1; }
135 static inline u64 get_cpu_iowait_time_us(int cpu, u64 *unused) { return -1; }
136 #endif /* !CONFIG_NO_HZ_COMMON */
138 #ifdef CONFIG_NO_HZ_FULL
139 extern bool tick_nohz_full_running;
140 extern cpumask_var_t tick_nohz_full_mask;
141 extern cpumask_var_t housekeeping_mask;
143 static inline bool tick_nohz_full_enabled(void)
145 if (!context_tracking_is_enabled())
148 return tick_nohz_full_running;
151 static inline bool tick_nohz_full_cpu(int cpu)
153 if (!tick_nohz_full_enabled())
156 return cpumask_test_cpu(cpu, tick_nohz_full_mask);
159 static inline void tick_nohz_full_add_cpus_to(struct cpumask *mask)
161 if (tick_nohz_full_enabled())
162 cpumask_or(mask, mask, tick_nohz_full_mask);
165 static inline int housekeeping_any_cpu(void)
167 return cpumask_any_and(housekeeping_mask, cpu_online_mask);
170 extern void tick_nohz_dep_set(enum tick_dep_bits bit);
171 extern void tick_nohz_dep_clear(enum tick_dep_bits bit);
172 extern void tick_nohz_dep_set_cpu(int cpu, enum tick_dep_bits bit);
173 extern void tick_nohz_dep_clear_cpu(int cpu, enum tick_dep_bits bit);
174 extern void tick_nohz_dep_set_task(struct task_struct *tsk,
175 enum tick_dep_bits bit);
176 extern void tick_nohz_dep_clear_task(struct task_struct *tsk,
177 enum tick_dep_bits bit);
178 extern void tick_nohz_dep_set_signal(struct signal_struct *signal,
179 enum tick_dep_bits bit);
180 extern void tick_nohz_dep_clear_signal(struct signal_struct *signal,
181 enum tick_dep_bits bit);
184 * The below are tick_nohz_[set,clear]_dep() wrappers that optimize off-cases
185 * on top of static keys.
187 static inline void tick_dep_set(enum tick_dep_bits bit)
189 if (tick_nohz_full_enabled())
190 tick_nohz_dep_set(bit);
193 static inline void tick_dep_clear(enum tick_dep_bits bit)
195 if (tick_nohz_full_enabled())
196 tick_nohz_dep_clear(bit);
199 static inline void tick_dep_set_cpu(int cpu, enum tick_dep_bits bit)
201 if (tick_nohz_full_cpu(cpu))
202 tick_nohz_dep_set_cpu(cpu, bit);
205 static inline void tick_dep_clear_cpu(int cpu, enum tick_dep_bits bit)
207 if (tick_nohz_full_cpu(cpu))
208 tick_nohz_dep_clear_cpu(cpu, bit);
211 static inline void tick_dep_set_task(struct task_struct *tsk,
212 enum tick_dep_bits bit)
214 if (tick_nohz_full_enabled())
215 tick_nohz_dep_set_task(tsk, bit);
217 static inline void tick_dep_clear_task(struct task_struct *tsk,
218 enum tick_dep_bits bit)
220 if (tick_nohz_full_enabled())
221 tick_nohz_dep_clear_task(tsk, bit);
223 static inline void tick_dep_set_signal(struct signal_struct *signal,
224 enum tick_dep_bits bit)
226 if (tick_nohz_full_enabled())
227 tick_nohz_dep_set_signal(signal, bit);
229 static inline void tick_dep_clear_signal(struct signal_struct *signal,
230 enum tick_dep_bits bit)
232 if (tick_nohz_full_enabled())
233 tick_nohz_dep_clear_signal(signal, bit);
236 extern void tick_nohz_full_kick_cpu(int cpu);
237 extern void __tick_nohz_task_switch(void);
239 static inline int housekeeping_any_cpu(void)
241 return smp_processor_id();
243 static inline bool tick_nohz_full_enabled(void) { return false; }
244 static inline bool tick_nohz_full_cpu(int cpu) { return false; }
245 static inline void tick_nohz_full_add_cpus_to(struct cpumask *mask) { }
247 static inline void tick_dep_set(enum tick_dep_bits bit) { }
248 static inline void tick_dep_clear(enum tick_dep_bits bit) { }
249 static inline void tick_dep_set_cpu(int cpu, enum tick_dep_bits bit) { }
250 static inline void tick_dep_clear_cpu(int cpu, enum tick_dep_bits bit) { }
251 static inline void tick_dep_set_task(struct task_struct *tsk,
252 enum tick_dep_bits bit) { }
253 static inline void tick_dep_clear_task(struct task_struct *tsk,
254 enum tick_dep_bits bit) { }
255 static inline void tick_dep_set_signal(struct signal_struct *signal,
256 enum tick_dep_bits bit) { }
257 static inline void tick_dep_clear_signal(struct signal_struct *signal,
258 enum tick_dep_bits bit) { }
260 static inline void tick_nohz_full_kick_cpu(int cpu) { }
261 static inline void __tick_nohz_task_switch(void) { }
264 static inline const struct cpumask *housekeeping_cpumask(void)
266 #ifdef CONFIG_NO_HZ_FULL
267 if (tick_nohz_full_enabled())
268 return housekeeping_mask;
270 return cpu_possible_mask;
273 static inline bool is_housekeeping_cpu(int cpu)
275 #ifdef CONFIG_NO_HZ_FULL
276 if (tick_nohz_full_enabled())
277 return cpumask_test_cpu(cpu, housekeeping_mask);
282 static inline void housekeeping_affine(struct task_struct *t)
284 #ifdef CONFIG_NO_HZ_FULL
285 if (tick_nohz_full_enabled())
286 set_cpus_allowed_ptr(t, housekeeping_mask);
291 static inline void tick_nohz_task_switch(void)
293 if (tick_nohz_full_enabled())
294 __tick_nohz_task_switch();