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 #if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_HOTPLUG_CPU)
72 extern void tick_offline_cpu(unsigned int cpu
);
74 static inline void tick_offline_cpu(unsigned int cpu
) { }
77 #ifdef CONFIG_GENERIC_CLOCKEVENTS
78 extern int tick_broadcast_oneshot_control(enum tick_broadcast_state state
);
80 static inline int tick_broadcast_oneshot_control(enum tick_broadcast_state state
)
86 static inline void tick_broadcast_enable(void)
88 tick_broadcast_control(TICK_BROADCAST_ON
);
90 static inline void tick_broadcast_disable(void)
92 tick_broadcast_control(TICK_BROADCAST_OFF
);
94 static inline void tick_broadcast_force(void)
96 tick_broadcast_control(TICK_BROADCAST_FORCE
);
98 static inline int tick_broadcast_enter(void)
100 return tick_broadcast_oneshot_control(TICK_BROADCAST_ENTER
);
102 static inline void tick_broadcast_exit(void)
104 tick_broadcast_oneshot_control(TICK_BROADCAST_EXIT
);
108 TICK_DEP_BIT_POSIX_TIMER
= 0,
109 TICK_DEP_BIT_PERF_EVENTS
= 1,
110 TICK_DEP_BIT_SCHED
= 2,
111 TICK_DEP_BIT_CLOCK_UNSTABLE
= 3
114 #define TICK_DEP_MASK_NONE 0
115 #define TICK_DEP_MASK_POSIX_TIMER (1 << TICK_DEP_BIT_POSIX_TIMER)
116 #define TICK_DEP_MASK_PERF_EVENTS (1 << TICK_DEP_BIT_PERF_EVENTS)
117 #define TICK_DEP_MASK_SCHED (1 << TICK_DEP_BIT_SCHED)
118 #define TICK_DEP_MASK_CLOCK_UNSTABLE (1 << TICK_DEP_BIT_CLOCK_UNSTABLE)
120 #ifdef CONFIG_NO_HZ_COMMON
121 extern bool tick_nohz_enabled
;
122 extern bool tick_nohz_tick_stopped(void);
123 extern bool tick_nohz_tick_stopped_cpu(int cpu
);
124 extern void tick_nohz_idle_stop_tick(void);
125 extern void tick_nohz_idle_retain_tick(void);
126 extern void tick_nohz_idle_restart_tick(void);
127 extern void tick_nohz_idle_enter(void);
128 extern void tick_nohz_idle_exit(void);
129 extern void tick_nohz_irq_exit(void);
130 extern bool tick_nohz_idle_got_tick(void);
131 extern ktime_t
tick_nohz_get_next_hrtimer(void);
132 extern ktime_t
tick_nohz_get_sleep_length(ktime_t
*delta_next
);
133 extern unsigned long tick_nohz_get_idle_calls(void);
134 extern unsigned long tick_nohz_get_idle_calls_cpu(int cpu
);
135 extern u64
get_cpu_idle_time_us(int cpu
, u64
*last_update_time
);
136 extern u64
get_cpu_iowait_time_us(int cpu
, u64
*last_update_time
);
138 static inline void tick_nohz_idle_stop_tick_protected(void)
141 tick_nohz_idle_stop_tick();
145 #else /* !CONFIG_NO_HZ_COMMON */
146 #define tick_nohz_enabled (0)
147 static inline int tick_nohz_tick_stopped(void) { return 0; }
148 static inline int tick_nohz_tick_stopped_cpu(int cpu
) { return 0; }
149 static inline void tick_nohz_idle_stop_tick(void) { }
150 static inline void tick_nohz_idle_retain_tick(void) { }
151 static inline void tick_nohz_idle_restart_tick(void) { }
152 static inline void tick_nohz_idle_enter(void) { }
153 static inline void tick_nohz_idle_exit(void) { }
154 static inline bool tick_nohz_idle_got_tick(void) { return false; }
155 static inline ktime_t
tick_nohz_get_next_hrtimer(void)
157 /* Next wake up is the tick period, assume it starts now */
158 return ktime_add(ktime_get(), TICK_NSEC
);
160 static inline ktime_t
tick_nohz_get_sleep_length(ktime_t
*delta_next
)
162 *delta_next
= TICK_NSEC
;
165 static inline u64
get_cpu_idle_time_us(int cpu
, u64
*unused
) { return -1; }
166 static inline u64
get_cpu_iowait_time_us(int cpu
, u64
*unused
) { return -1; }
168 static inline void tick_nohz_idle_stop_tick_protected(void) { }
169 #endif /* !CONFIG_NO_HZ_COMMON */
171 #ifdef CONFIG_NO_HZ_FULL
172 extern bool tick_nohz_full_running
;
173 extern cpumask_var_t tick_nohz_full_mask
;
175 static inline bool tick_nohz_full_enabled(void)
177 if (!context_tracking_is_enabled())
180 return tick_nohz_full_running
;
183 static inline bool tick_nohz_full_cpu(int cpu
)
185 if (!tick_nohz_full_enabled())
188 return cpumask_test_cpu(cpu
, tick_nohz_full_mask
);
191 static inline void tick_nohz_full_add_cpus_to(struct cpumask
*mask
)
193 if (tick_nohz_full_enabled())
194 cpumask_or(mask
, mask
, tick_nohz_full_mask
);
197 extern void tick_nohz_dep_set(enum tick_dep_bits bit
);
198 extern void tick_nohz_dep_clear(enum tick_dep_bits bit
);
199 extern void tick_nohz_dep_set_cpu(int cpu
, enum tick_dep_bits bit
);
200 extern void tick_nohz_dep_clear_cpu(int cpu
, enum tick_dep_bits bit
);
201 extern void tick_nohz_dep_set_task(struct task_struct
*tsk
,
202 enum tick_dep_bits bit
);
203 extern void tick_nohz_dep_clear_task(struct task_struct
*tsk
,
204 enum tick_dep_bits bit
);
205 extern void tick_nohz_dep_set_signal(struct signal_struct
*signal
,
206 enum tick_dep_bits bit
);
207 extern void tick_nohz_dep_clear_signal(struct signal_struct
*signal
,
208 enum tick_dep_bits bit
);
211 * The below are tick_nohz_[set,clear]_dep() wrappers that optimize off-cases
212 * on top of static keys.
214 static inline void tick_dep_set(enum tick_dep_bits bit
)
216 if (tick_nohz_full_enabled())
217 tick_nohz_dep_set(bit
);
220 static inline void tick_dep_clear(enum tick_dep_bits bit
)
222 if (tick_nohz_full_enabled())
223 tick_nohz_dep_clear(bit
);
226 static inline void tick_dep_set_cpu(int cpu
, enum tick_dep_bits bit
)
228 if (tick_nohz_full_cpu(cpu
))
229 tick_nohz_dep_set_cpu(cpu
, bit
);
232 static inline void tick_dep_clear_cpu(int cpu
, enum tick_dep_bits bit
)
234 if (tick_nohz_full_cpu(cpu
))
235 tick_nohz_dep_clear_cpu(cpu
, bit
);
238 static inline void tick_dep_set_task(struct task_struct
*tsk
,
239 enum tick_dep_bits bit
)
241 if (tick_nohz_full_enabled())
242 tick_nohz_dep_set_task(tsk
, bit
);
244 static inline void tick_dep_clear_task(struct task_struct
*tsk
,
245 enum tick_dep_bits bit
)
247 if (tick_nohz_full_enabled())
248 tick_nohz_dep_clear_task(tsk
, bit
);
250 static inline void tick_dep_set_signal(struct signal_struct
*signal
,
251 enum tick_dep_bits bit
)
253 if (tick_nohz_full_enabled())
254 tick_nohz_dep_set_signal(signal
, bit
);
256 static inline void tick_dep_clear_signal(struct signal_struct
*signal
,
257 enum tick_dep_bits bit
)
259 if (tick_nohz_full_enabled())
260 tick_nohz_dep_clear_signal(signal
, bit
);
263 extern void tick_nohz_full_kick_cpu(int cpu
);
264 extern void __tick_nohz_task_switch(void);
265 extern void __init
tick_nohz_full_setup(cpumask_var_t cpumask
);
267 static inline bool tick_nohz_full_enabled(void) { return false; }
268 static inline bool tick_nohz_full_cpu(int cpu
) { return false; }
269 static inline void tick_nohz_full_add_cpus_to(struct cpumask
*mask
) { }
271 static inline void tick_dep_set(enum tick_dep_bits bit
) { }
272 static inline void tick_dep_clear(enum tick_dep_bits bit
) { }
273 static inline void tick_dep_set_cpu(int cpu
, enum tick_dep_bits bit
) { }
274 static inline void tick_dep_clear_cpu(int cpu
, enum tick_dep_bits bit
) { }
275 static inline void tick_dep_set_task(struct task_struct
*tsk
,
276 enum tick_dep_bits bit
) { }
277 static inline void tick_dep_clear_task(struct task_struct
*tsk
,
278 enum tick_dep_bits bit
) { }
279 static inline void tick_dep_set_signal(struct signal_struct
*signal
,
280 enum tick_dep_bits bit
) { }
281 static inline void tick_dep_clear_signal(struct signal_struct
*signal
,
282 enum tick_dep_bits bit
) { }
284 static inline void tick_nohz_full_kick_cpu(int cpu
) { }
285 static inline void __tick_nohz_task_switch(void) { }
286 static inline void tick_nohz_full_setup(cpumask_var_t cpumask
) { }
289 static inline void tick_nohz_task_switch(void)
291 if (tick_nohz_full_enabled())
292 __tick_nohz_task_switch();