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,
112 TICK_DEP_BIT_RCU
= 4,
113 TICK_DEP_BIT_RCU_EXP
= 5
115 #define TICK_DEP_BIT_MAX TICK_DEP_BIT_RCU_EXP
117 #define TICK_DEP_MASK_NONE 0
118 #define TICK_DEP_MASK_POSIX_TIMER (1 << TICK_DEP_BIT_POSIX_TIMER)
119 #define TICK_DEP_MASK_PERF_EVENTS (1 << TICK_DEP_BIT_PERF_EVENTS)
120 #define TICK_DEP_MASK_SCHED (1 << TICK_DEP_BIT_SCHED)
121 #define TICK_DEP_MASK_CLOCK_UNSTABLE (1 << TICK_DEP_BIT_CLOCK_UNSTABLE)
122 #define TICK_DEP_MASK_RCU (1 << TICK_DEP_BIT_RCU)
123 #define TICK_DEP_MASK_RCU_EXP (1 << TICK_DEP_BIT_RCU_EXP)
125 #ifdef CONFIG_NO_HZ_COMMON
126 extern bool tick_nohz_enabled
;
127 extern bool tick_nohz_tick_stopped(void);
128 extern bool tick_nohz_tick_stopped_cpu(int cpu
);
129 extern void tick_nohz_idle_stop_tick(void);
130 extern void tick_nohz_idle_retain_tick(void);
131 extern void tick_nohz_idle_restart_tick(void);
132 extern void tick_nohz_idle_enter(void);
133 extern void tick_nohz_idle_exit(void);
134 extern void tick_nohz_irq_exit(void);
135 extern bool tick_nohz_idle_got_tick(void);
136 extern ktime_t
tick_nohz_get_next_hrtimer(void);
137 extern ktime_t
tick_nohz_get_sleep_length(ktime_t
*delta_next
);
138 extern unsigned long tick_nohz_get_idle_calls(void);
139 extern unsigned long tick_nohz_get_idle_calls_cpu(int cpu
);
140 extern u64
get_cpu_idle_time_us(int cpu
, u64
*last_update_time
);
141 extern u64
get_cpu_iowait_time_us(int cpu
, u64
*last_update_time
);
143 static inline void tick_nohz_idle_stop_tick_protected(void)
146 tick_nohz_idle_stop_tick();
150 #else /* !CONFIG_NO_HZ_COMMON */
151 #define tick_nohz_enabled (0)
152 static inline int tick_nohz_tick_stopped(void) { return 0; }
153 static inline int tick_nohz_tick_stopped_cpu(int cpu
) { return 0; }
154 static inline void tick_nohz_idle_stop_tick(void) { }
155 static inline void tick_nohz_idle_retain_tick(void) { }
156 static inline void tick_nohz_idle_restart_tick(void) { }
157 static inline void tick_nohz_idle_enter(void) { }
158 static inline void tick_nohz_idle_exit(void) { }
159 static inline bool tick_nohz_idle_got_tick(void) { return false; }
160 static inline ktime_t
tick_nohz_get_next_hrtimer(void)
162 /* Next wake up is the tick period, assume it starts now */
163 return ktime_add(ktime_get(), TICK_NSEC
);
165 static inline ktime_t
tick_nohz_get_sleep_length(ktime_t
*delta_next
)
167 *delta_next
= TICK_NSEC
;
170 static inline u64
get_cpu_idle_time_us(int cpu
, u64
*unused
) { return -1; }
171 static inline u64
get_cpu_iowait_time_us(int cpu
, u64
*unused
) { return -1; }
173 static inline void tick_nohz_idle_stop_tick_protected(void) { }
174 #endif /* !CONFIG_NO_HZ_COMMON */
176 #ifdef CONFIG_NO_HZ_FULL
177 extern bool tick_nohz_full_running
;
178 extern cpumask_var_t tick_nohz_full_mask
;
180 static inline bool tick_nohz_full_enabled(void)
182 if (!context_tracking_enabled())
185 return tick_nohz_full_running
;
188 static inline bool tick_nohz_full_cpu(int cpu
)
190 if (!tick_nohz_full_enabled())
193 return cpumask_test_cpu(cpu
, tick_nohz_full_mask
);
196 static inline void tick_nohz_full_add_cpus_to(struct cpumask
*mask
)
198 if (tick_nohz_full_enabled())
199 cpumask_or(mask
, mask
, tick_nohz_full_mask
);
202 extern void tick_nohz_dep_set(enum tick_dep_bits bit
);
203 extern void tick_nohz_dep_clear(enum tick_dep_bits bit
);
204 extern void tick_nohz_dep_set_cpu(int cpu
, enum tick_dep_bits bit
);
205 extern void tick_nohz_dep_clear_cpu(int cpu
, enum tick_dep_bits bit
);
206 extern void tick_nohz_dep_set_task(struct task_struct
*tsk
,
207 enum tick_dep_bits bit
);
208 extern void tick_nohz_dep_clear_task(struct task_struct
*tsk
,
209 enum tick_dep_bits bit
);
210 extern void tick_nohz_dep_set_signal(struct signal_struct
*signal
,
211 enum tick_dep_bits bit
);
212 extern void tick_nohz_dep_clear_signal(struct signal_struct
*signal
,
213 enum tick_dep_bits bit
);
216 * The below are tick_nohz_[set,clear]_dep() wrappers that optimize off-cases
217 * on top of static keys.
219 static inline void tick_dep_set(enum tick_dep_bits bit
)
221 if (tick_nohz_full_enabled())
222 tick_nohz_dep_set(bit
);
225 static inline void tick_dep_clear(enum tick_dep_bits bit
)
227 if (tick_nohz_full_enabled())
228 tick_nohz_dep_clear(bit
);
231 static inline void tick_dep_set_cpu(int cpu
, enum tick_dep_bits bit
)
233 if (tick_nohz_full_cpu(cpu
))
234 tick_nohz_dep_set_cpu(cpu
, bit
);
237 static inline void tick_dep_clear_cpu(int cpu
, enum tick_dep_bits bit
)
239 if (tick_nohz_full_cpu(cpu
))
240 tick_nohz_dep_clear_cpu(cpu
, bit
);
243 static inline void tick_dep_set_task(struct task_struct
*tsk
,
244 enum tick_dep_bits bit
)
246 if (tick_nohz_full_enabled())
247 tick_nohz_dep_set_task(tsk
, bit
);
249 static inline void tick_dep_clear_task(struct task_struct
*tsk
,
250 enum tick_dep_bits bit
)
252 if (tick_nohz_full_enabled())
253 tick_nohz_dep_clear_task(tsk
, bit
);
255 static inline void tick_dep_set_signal(struct signal_struct
*signal
,
256 enum tick_dep_bits bit
)
258 if (tick_nohz_full_enabled())
259 tick_nohz_dep_set_signal(signal
, bit
);
261 static inline void tick_dep_clear_signal(struct signal_struct
*signal
,
262 enum tick_dep_bits bit
)
264 if (tick_nohz_full_enabled())
265 tick_nohz_dep_clear_signal(signal
, bit
);
268 extern void tick_nohz_full_kick_cpu(int cpu
);
269 extern void __tick_nohz_task_switch(void);
270 extern void __init
tick_nohz_full_setup(cpumask_var_t cpumask
);
272 static inline bool tick_nohz_full_enabled(void) { return false; }
273 static inline bool tick_nohz_full_cpu(int cpu
) { return false; }
274 static inline void tick_nohz_full_add_cpus_to(struct cpumask
*mask
) { }
276 static inline void tick_nohz_dep_set_cpu(int cpu
, enum tick_dep_bits bit
) { }
277 static inline void tick_nohz_dep_clear_cpu(int cpu
, enum tick_dep_bits bit
) { }
279 static inline void tick_dep_set(enum tick_dep_bits bit
) { }
280 static inline void tick_dep_clear(enum tick_dep_bits bit
) { }
281 static inline void tick_dep_set_cpu(int cpu
, enum tick_dep_bits bit
) { }
282 static inline void tick_dep_clear_cpu(int cpu
, enum tick_dep_bits bit
) { }
283 static inline void tick_dep_set_task(struct task_struct
*tsk
,
284 enum tick_dep_bits bit
) { }
285 static inline void tick_dep_clear_task(struct task_struct
*tsk
,
286 enum tick_dep_bits bit
) { }
287 static inline void tick_dep_set_signal(struct signal_struct
*signal
,
288 enum tick_dep_bits bit
) { }
289 static inline void tick_dep_clear_signal(struct signal_struct
*signal
,
290 enum tick_dep_bits bit
) { }
292 static inline void tick_nohz_full_kick_cpu(int cpu
) { }
293 static inline void __tick_nohz_task_switch(void) { }
294 static inline void tick_nohz_full_setup(cpumask_var_t cpumask
) { }
297 static inline void tick_nohz_task_switch(void)
299 if (tick_nohz_full_enabled())
300 __tick_nohz_task_switch();