1 /*
2 * Tick related global functions
3 */
4 #ifndef _LINUX_TICK_H
5 #define _LINUX_TICK_H
6
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>
13
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 */
tick_init(void)23 static inline void tick_init(void) { }
tick_suspend_local(void)24 static inline void tick_suspend_local(void) { }
tick_resume_local(void)25 static inline void tick_resume_local(void) { }
tick_handover_do_timer(void)26 static inline void tick_handover_do_timer(void) { }
tick_cleanup_dead_cpu(int cpu)27 static inline void tick_cleanup_dead_cpu(int cpu) { }
28 #endif /* !CONFIG_GENERIC_CLOCKEVENTS */
29
30 #if defined(CONFIG_GENERIC_CLOCKEVENTS) && defined(CONFIG_SUSPEND)
31 extern void tick_freeze(void);
32 extern void tick_unfreeze(void);
33 #else
tick_freeze(void)34 static inline void tick_freeze(void) { }
tick_unfreeze(void)35 static inline void tick_unfreeze(void) { }
36 #endif
37
38 #ifdef CONFIG_TICK_ONESHOT
39 extern void tick_irq_enter(void);
40 # ifndef arch_needs_cpu
41 # define arch_needs_cpu() (0)
42 # endif
43 # else
tick_irq_enter(void)44 static inline void tick_irq_enter(void) { }
45 #endif
46
47 #if defined(CONFIG_GENERIC_CLOCKEVENTS_BROADCAST) && defined(CONFIG_TICK_ONESHOT)
48 extern void hotplug_cpu__broadcast_tick_pull(int dead_cpu);
49 #else
hotplug_cpu__broadcast_tick_pull(int dead_cpu)50 static inline void hotplug_cpu__broadcast_tick_pull(int dead_cpu) { }
51 #endif
52
53 enum tick_broadcast_mode {
54 TICK_BROADCAST_OFF,
55 TICK_BROADCAST_ON,
56 TICK_BROADCAST_FORCE,
57 };
58
59 enum tick_broadcast_state {
60 TICK_BROADCAST_EXIT,
61 TICK_BROADCAST_ENTER,
62 };
63
64 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
65 extern void tick_broadcast_control(enum tick_broadcast_mode mode);
66 #else
tick_broadcast_control(enum tick_broadcast_mode mode)67 static inline void tick_broadcast_control(enum tick_broadcast_mode mode) { }
68 #endif /* BROADCAST */
69
70 #ifdef CONFIG_GENERIC_CLOCKEVENTS
71 extern int tick_broadcast_oneshot_control(enum tick_broadcast_state state);
72 #else
tick_broadcast_oneshot_control(enum tick_broadcast_state state)73 static inline int tick_broadcast_oneshot_control(enum tick_broadcast_state state)
74 {
75 return 0;
76 }
77 #endif
78
tick_broadcast_enable(void)79 static inline void tick_broadcast_enable(void)
80 {
81 tick_broadcast_control(TICK_BROADCAST_ON);
82 }
tick_broadcast_disable(void)83 static inline void tick_broadcast_disable(void)
84 {
85 tick_broadcast_control(TICK_BROADCAST_OFF);
86 }
tick_broadcast_force(void)87 static inline void tick_broadcast_force(void)
88 {
89 tick_broadcast_control(TICK_BROADCAST_FORCE);
90 }
tick_broadcast_enter(void)91 static inline int tick_broadcast_enter(void)
92 {
93 return tick_broadcast_oneshot_control(TICK_BROADCAST_ENTER);
94 }
tick_broadcast_exit(void)95 static inline void tick_broadcast_exit(void)
96 {
97 tick_broadcast_oneshot_control(TICK_BROADCAST_EXIT);
98 }
99
100 #ifdef CONFIG_NO_HZ_COMMON
101 extern int tick_nohz_tick_stopped(void);
102 extern void tick_nohz_idle_enter(void);
103 extern void tick_nohz_idle_exit(void);
104 extern void tick_nohz_irq_exit(void);
105 extern ktime_t tick_nohz_get_sleep_length(void);
106 extern unsigned long tick_nohz_get_idle_calls(void);
107 extern u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time);
108 extern u64 get_cpu_iowait_time_us(int cpu, u64 *last_update_time);
109 #else /* !CONFIG_NO_HZ_COMMON */
tick_nohz_tick_stopped(void)110 static inline int tick_nohz_tick_stopped(void) { return 0; }
tick_nohz_idle_enter(void)111 static inline void tick_nohz_idle_enter(void) { }
tick_nohz_idle_exit(void)112 static inline void tick_nohz_idle_exit(void) { }
113
tick_nohz_get_sleep_length(void)114 static inline ktime_t tick_nohz_get_sleep_length(void)
115 {
116 ktime_t len = { .tv64 = NSEC_PER_SEC/HZ };
117
118 return len;
119 }
get_cpu_idle_time_us(int cpu,u64 * unused)120 static inline u64 get_cpu_idle_time_us(int cpu, u64 *unused) { return -1; }
get_cpu_iowait_time_us(int cpu,u64 * unused)121 static inline u64 get_cpu_iowait_time_us(int cpu, u64 *unused) { return -1; }
122 #endif /* !CONFIG_NO_HZ_COMMON */
123
124 #ifdef CONFIG_NO_HZ_FULL
125 extern bool tick_nohz_full_running;
126 extern cpumask_var_t tick_nohz_full_mask;
127 extern cpumask_var_t housekeeping_mask;
128
tick_nohz_full_enabled(void)129 static inline bool tick_nohz_full_enabled(void)
130 {
131 if (!context_tracking_is_enabled())
132 return false;
133
134 return tick_nohz_full_running;
135 }
136
tick_nohz_full_cpu(int cpu)137 static inline bool tick_nohz_full_cpu(int cpu)
138 {
139 if (!tick_nohz_full_enabled())
140 return false;
141
142 return cpumask_test_cpu(cpu, tick_nohz_full_mask);
143 }
144
tick_nohz_full_add_cpus_to(struct cpumask * mask)145 static inline void tick_nohz_full_add_cpus_to(struct cpumask *mask)
146 {
147 if (tick_nohz_full_enabled())
148 cpumask_or(mask, mask, tick_nohz_full_mask);
149 }
150
housekeeping_any_cpu(void)151 static inline int housekeeping_any_cpu(void)
152 {
153 return cpumask_any_and(housekeeping_mask, cpu_online_mask);
154 }
155
156 extern void tick_nohz_full_kick(void);
157 extern void tick_nohz_full_kick_cpu(int cpu);
158 extern void tick_nohz_full_kick_all(void);
159 extern void __tick_nohz_task_switch(void);
160 #else
housekeeping_any_cpu(void)161 static inline int housekeeping_any_cpu(void)
162 {
163 return smp_processor_id();
164 }
tick_nohz_full_enabled(void)165 static inline bool tick_nohz_full_enabled(void) { return false; }
tick_nohz_full_cpu(int cpu)166 static inline bool tick_nohz_full_cpu(int cpu) { return false; }
tick_nohz_full_add_cpus_to(struct cpumask * mask)167 static inline void tick_nohz_full_add_cpus_to(struct cpumask *mask) { }
tick_nohz_full_kick_cpu(int cpu)168 static inline void tick_nohz_full_kick_cpu(int cpu) { }
tick_nohz_full_kick(void)169 static inline void tick_nohz_full_kick(void) { }
tick_nohz_full_kick_all(void)170 static inline void tick_nohz_full_kick_all(void) { }
__tick_nohz_task_switch(void)171 static inline void __tick_nohz_task_switch(void) { }
172 #endif
173
housekeeping_cpumask(void)174 static inline const struct cpumask *housekeeping_cpumask(void)
175 {
176 #ifdef CONFIG_NO_HZ_FULL
177 if (tick_nohz_full_enabled())
178 return housekeeping_mask;
179 #endif
180 return cpu_possible_mask;
181 }
182
is_housekeeping_cpu(int cpu)183 static inline bool is_housekeeping_cpu(int cpu)
184 {
185 #ifdef CONFIG_NO_HZ_FULL
186 if (tick_nohz_full_enabled())
187 return cpumask_test_cpu(cpu, housekeeping_mask);
188 #endif
189 return true;
190 }
191
housekeeping_affine(struct task_struct * t)192 static inline void housekeeping_affine(struct task_struct *t)
193 {
194 #ifdef CONFIG_NO_HZ_FULL
195 if (tick_nohz_full_enabled())
196 set_cpus_allowed_ptr(t, housekeeping_mask);
197
198 #endif
199 }
200
tick_nohz_task_switch(void)201 static inline void tick_nohz_task_switch(void)
202 {
203 if (tick_nohz_full_enabled())
204 __tick_nohz_task_switch();
205 }
206
207 #endif
208