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13#ifndef _LINUX_CPU_H_
14#define _LINUX_CPU_H_
15
16#include <linux/node.h>
17#include <linux/compiler.h>
18#include <linux/cpumask.h>
19
20struct device;
21
22struct cpu {
23 int node_id;
24 int hotpluggable;
25 struct device dev;
26};
27
28extern int register_cpu(struct cpu *cpu, int num);
29extern struct device *get_cpu_device(unsigned cpu);
30extern bool cpu_is_hotpluggable(unsigned cpu);
31extern bool arch_match_cpu_phys_id(int cpu, u64 phys_id);
32
33extern int cpu_add_dev_attr(struct device_attribute *attr);
34extern void cpu_remove_dev_attr(struct device_attribute *attr);
35
36extern int cpu_add_dev_attr_group(struct attribute_group *attrs);
37extern void cpu_remove_dev_attr_group(struct attribute_group *attrs);
38
39#ifdef CONFIG_HOTPLUG_CPU
40extern void unregister_cpu(struct cpu *cpu);
41extern ssize_t arch_cpu_probe(const char *, size_t);
42extern ssize_t arch_cpu_release(const char *, size_t);
43#endif
44struct notifier_block;
45
46#ifdef CONFIG_ARCH_HAS_CPU_AUTOPROBE
47extern int arch_cpu_uevent(struct device *dev, struct kobj_uevent_env *env);
48extern ssize_t arch_print_cpu_modalias(struct device *dev,
49 struct device_attribute *attr,
50 char *bufptr);
51#endif
52
53
54
55
56enum {
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67
68 CPU_PRI_SCHED_ACTIVE = INT_MAX,
69 CPU_PRI_CPUSET_ACTIVE = INT_MAX - 1,
70 CPU_PRI_SCHED_INACTIVE = INT_MIN + 1,
71 CPU_PRI_CPUSET_INACTIVE = INT_MIN,
72
73
74 CPU_PRI_PERF = 20,
75 CPU_PRI_MIGRATION = 10,
76
77 CPU_PRI_WORKQUEUE_UP = 5,
78 CPU_PRI_WORKQUEUE_DOWN = -5,
79};
80
81#define CPU_ONLINE 0x0002
82#define CPU_UP_PREPARE 0x0003
83#define CPU_UP_CANCELED 0x0004
84#define CPU_DOWN_PREPARE 0x0005
85#define CPU_DOWN_FAILED 0x0006
86#define CPU_DEAD 0x0007
87#define CPU_DYING 0x0008
88
89
90
91
92#define CPU_POST_DEAD 0x0009
93
94#define CPU_STARTING 0x000A
95
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100
101
102#define CPU_TASKS_FROZEN 0x0010
103
104#define CPU_ONLINE_FROZEN (CPU_ONLINE | CPU_TASKS_FROZEN)
105#define CPU_UP_PREPARE_FROZEN (CPU_UP_PREPARE | CPU_TASKS_FROZEN)
106#define CPU_UP_CANCELED_FROZEN (CPU_UP_CANCELED | CPU_TASKS_FROZEN)
107#define CPU_DOWN_PREPARE_FROZEN (CPU_DOWN_PREPARE | CPU_TASKS_FROZEN)
108#define CPU_DOWN_FAILED_FROZEN (CPU_DOWN_FAILED | CPU_TASKS_FROZEN)
109#define CPU_DEAD_FROZEN (CPU_DEAD | CPU_TASKS_FROZEN)
110#define CPU_DYING_FROZEN (CPU_DYING | CPU_TASKS_FROZEN)
111#define CPU_STARTING_FROZEN (CPU_STARTING | CPU_TASKS_FROZEN)
112
113
114#ifdef CONFIG_SMP
115
116#if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE)
117#define cpu_notifier(fn, pri) { \
118 static struct notifier_block fn##_nb = \
119 { .notifier_call = fn, .priority = pri }; \
120 register_cpu_notifier(&fn##_nb); \
121}
122#else
123#define cpu_notifier(fn, pri) do { (void)(fn); } while (0)
124#endif
125#ifdef CONFIG_HOTPLUG_CPU
126extern int register_cpu_notifier(struct notifier_block *nb);
127extern void unregister_cpu_notifier(struct notifier_block *nb);
128#else
129
130#ifndef MODULE
131extern int register_cpu_notifier(struct notifier_block *nb);
132#else
133static inline int register_cpu_notifier(struct notifier_block *nb)
134{
135 return 0;
136}
137#endif
138
139static inline void unregister_cpu_notifier(struct notifier_block *nb)
140{
141}
142#endif
143
144int cpu_up(unsigned int cpu);
145void notify_cpu_starting(unsigned int cpu);
146extern void cpu_maps_update_begin(void);
147extern void cpu_maps_update_done(void);
148
149#else
150
151#define cpu_notifier(fn, pri) do { (void)(fn); } while (0)
152
153static inline int register_cpu_notifier(struct notifier_block *nb)
154{
155 return 0;
156}
157
158static inline void unregister_cpu_notifier(struct notifier_block *nb)
159{
160}
161
162static inline void cpu_maps_update_begin(void)
163{
164}
165
166static inline void cpu_maps_update_done(void)
167{
168}
169
170#endif
171extern struct bus_type cpu_subsys;
172
173#ifdef CONFIG_HOTPLUG_CPU
174
175
176extern void cpu_hotplug_begin(void);
177extern void cpu_hotplug_done(void);
178extern void get_online_cpus(void);
179extern void put_online_cpus(void);
180extern void cpu_hotplug_disable(void);
181extern void cpu_hotplug_enable(void);
182#define hotcpu_notifier(fn, pri) cpu_notifier(fn, pri)
183#define register_hotcpu_notifier(nb) register_cpu_notifier(nb)
184#define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb)
185void clear_tasks_mm_cpumask(int cpu);
186int cpu_down(unsigned int cpu);
187
188#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
189extern void cpu_hotplug_driver_lock(void);
190extern void cpu_hotplug_driver_unlock(void);
191#else
192static inline void cpu_hotplug_driver_lock(void)
193{
194}
195
196static inline void cpu_hotplug_driver_unlock(void)
197{
198}
199#endif
200
201#else
202
203static inline void cpu_hotplug_begin(void) {}
204static inline void cpu_hotplug_done(void) {}
205#define get_online_cpus() do { } while (0)
206#define put_online_cpus() do { } while (0)
207#define cpu_hotplug_disable() do { } while (0)
208#define cpu_hotplug_enable() do { } while (0)
209#define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0)
210
211#define register_hotcpu_notifier(nb) ({ (void)(nb); 0; })
212#define unregister_hotcpu_notifier(nb) ({ (void)(nb); })
213#endif
214
215#ifdef CONFIG_PM_SLEEP_SMP
216extern int disable_nonboot_cpus(void);
217extern void enable_nonboot_cpus(void);
218#else
219static inline int disable_nonboot_cpus(void) { return 0; }
220static inline void enable_nonboot_cpus(void) {}
221#endif
222
223enum cpuhp_state {
224 CPUHP_OFFLINE,
225 CPUHP_ONLINE,
226};
227
228void cpu_startup_entry(enum cpuhp_state state);
229void cpu_idle(void);
230
231void cpu_idle_poll_ctrl(bool enable);
232
233void arch_cpu_idle(void);
234void arch_cpu_idle_prepare(void);
235void arch_cpu_idle_enter(void);
236void arch_cpu_idle_exit(void);
237void arch_cpu_idle_dead(void);
238
239#endif
240