2 * Tick related global functions
7 #include <linux/clockchips.h>
8 #include <linux/irqflags.h>
9 #include <linux/percpu.h>
10 #include <linux/context_tracking_state.h>
11 #include <linux/cpumask.h>
12 #include <linux/sched.h>
14 #ifdef CONFIG_GENERIC_CLOCKEVENTS
15 extern void __init
tick_init(void);
16 /* Should be core only, but ARM BL switcher requires it */
17 extern void tick_suspend_local(void);
18 /* Should be core only, but XEN resume magic and ARM BL switcher require it */
19 extern void tick_resume_local(void);
20 extern void tick_handover_do_timer(void);
21 extern void tick_cleanup_dead_cpu(int cpu
);
22 #else /* CONFIG_GENERIC_CLOCKEVENTS */
23 static inline void tick_init(void) { }
24 static inline void tick_suspend_local(void) { }
25 static inline void tick_resume_local(void) { }
26 static inline void tick_handover_do_timer(void) { }
27 static inline void tick_cleanup_dead_cpu(int cpu
) { }
28 #endif /* !CONFIG_GENERIC_CLOCKEVENTS */
30 #if defined(CONFIG_GENERIC_CLOCKEVENTS) && defined(CONFIG_SUSPEND)
31 extern void tick_freeze(void);
32 extern void tick_unfreeze(void);
34 static inline void tick_freeze(void) { }
35 static inline void tick_unfreeze(void) { }
38 #ifdef CONFIG_TICK_ONESHOT
39 extern void tick_irq_enter(void);
40 # ifndef arch_needs_cpu
41 # define arch_needs_cpu() (0)
44 static inline void tick_irq_enter(void) { }
47 #if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT)
48 extern void hotplug_cpu__broadcast_tick_pull(int dead_cpu
);
50 static inline void hotplug_cpu__broadcast_tick_pull(int dead_cpu
) { }
53 enum tick_broadcast_mode
{
59 enum tick_broadcast_state
{
64 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
65 extern void tick_broadcast_control(enum tick_broadcast_mode mode
);
67 static inline void tick_broadcast_control(enum tick_broadcast_mode mode
) { }
68 #endif /* BROADCAST */
70 #ifdef CONFIG_GENERIC_CLOCKEVENTS
71 extern int tick_broadcast_oneshot_control(enum tick_broadcast_state state
);
73 static inline int tick_broadcast_oneshot_control(enum tick_broadcast_state state
)
79 static inline void tick_broadcast_enable(void)
81 tick_broadcast_control(TICK_BROADCAST_ON
);
83 static inline void tick_broadcast_disable(void)
85 tick_broadcast_control(TICK_BROADCAST_OFF
);
87 static inline void tick_broadcast_force(void)
89 tick_broadcast_control(TICK_BROADCAST_FORCE
);
91 static inline int tick_broadcast_enter(void)
93 return tick_broadcast_oneshot_control(TICK_BROADCAST_ENTER
);
95 static inline void tick_broadcast_exit(void)
97 tick_broadcast_oneshot_control(TICK_BROADCAST_EXIT
);
101 TICK_DEP_BIT_POSIX_TIMER
= 0,
102 TICK_DEP_BIT_PERF_EVENTS
= 1,
103 TICK_DEP_BIT_SCHED
= 2,
104 TICK_DEP_BIT_CLOCK_UNSTABLE
= 3
107 #define TICK_DEP_MASK_NONE 0
108 #define TICK_DEP_MASK_POSIX_TIMER (1 << TICK_DEP_BIT_POSIX_TIMER)
109 #define TICK_DEP_MASK_PERF_EVENTS (1 << TICK_DEP_BIT_PERF_EVENTS)
110 #define TICK_DEP_MASK_SCHED (1 << TICK_DEP_BIT_SCHED)
111 #define TICK_DEP_MASK_CLOCK_UNSTABLE (1 << TICK_DEP_BIT_CLOCK_UNSTABLE)
113 #ifdef CONFIG_NO_HZ_COMMON
114 extern bool tick_nohz_enabled
;
115 extern int tick_nohz_tick_stopped(void);
116 extern void tick_nohz_idle_enter(void);
117 extern void tick_nohz_idle_exit(void);
118 extern void tick_nohz_irq_exit(void);
119 extern ktime_t
tick_nohz_get_sleep_length(void);
120 extern u64
get_cpu_idle_time_us(int cpu
, u64
*last_update_time
);
121 extern u64
get_cpu_iowait_time_us(int cpu
, u64
*last_update_time
);
122 #else /* !CONFIG_NO_HZ_COMMON */
123 #define tick_nohz_enabled (0)
124 static inline int tick_nohz_tick_stopped(void) { return 0; }
125 static inline void tick_nohz_idle_enter(void) { }
126 static inline void tick_nohz_idle_exit(void) { }
128 static inline ktime_t
tick_nohz_get_sleep_length(void)
130 ktime_t len
= { .tv64
= 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();