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1/*
2 * include/linux/cpu.h - generic cpu definition
3 *
4 * This is mainly for topological representation. We define the
5 * basic 'struct cpu' here, which can be embedded in per-arch
6 * definitions of processors.
7 *
8 * Basic handling of the devices is done in drivers/base/cpu.c
9 * and system devices are handled in drivers/base/sys.c.
10 *
11 * CPUs are exported via sysfs in the class/cpu/devices/
12 * directory.
13 *
14 * Per-cpu interfaces can be implemented using a struct device_interface.
15 * See the following for how to do this:
16 * - drivers/base/intf.c
17 * - Documentation/driver-model/interface.txt
18 */
19#ifndef _LINUX_CPU_H_
20#define _LINUX_CPU_H_
21
22#include <linux/sysdev.h>
23#include <linux/node.h>
24#include <linux/compiler.h>
25#include <linux/cpumask.h>
26#include <linux/mutex.h>
27
28struct cpu {
29 int node_id; /* The node which contains the CPU */
30 int hotpluggable; /* creates sysfs control file if hotpluggable */
31 struct sys_device sysdev;
32};
33
34extern int register_cpu(struct cpu *cpu, int num);
35extern struct sys_device *get_cpu_sysdev(unsigned cpu);
36
37extern int cpu_add_sysdev_attr(struct sysdev_attribute *attr);
38extern void cpu_remove_sysdev_attr(struct sysdev_attribute *attr);
39
40extern int cpu_add_sysdev_attr_group(struct attribute_group *attrs);
41extern void cpu_remove_sysdev_attr_group(struct attribute_group *attrs);
42
43extern int sched_create_sysfs_power_savings_entries(struct sysdev_class *cls);
44
45#ifdef CONFIG_HOTPLUG_CPU
46extern void unregister_cpu(struct cpu *cpu);
47#endif
48struct notifier_block;
49
50#ifdef CONFIG_SMP
51/* Need to know about CPUs going up/down? */
52#ifdef CONFIG_HOTPLUG_CPU
53extern int register_cpu_notifier(struct notifier_block *nb);
54extern void unregister_cpu_notifier(struct notifier_block *nb);
55#else
56
57#ifndef MODULE
58extern int register_cpu_notifier(struct notifier_block *nb);
59#else
60static inline int register_cpu_notifier(struct notifier_block *nb)
61{
62 return 0;
63}
64#endif
65
66static inline void unregister_cpu_notifier(struct notifier_block *nb)
67{
68}
69#endif
70
71int cpu_up(unsigned int cpu);
72void notify_cpu_starting(unsigned int cpu);
73extern void cpu_hotplug_init(void);
74extern void cpu_maps_update_begin(void);
75extern void cpu_maps_update_done(void);
76
77#else /* CONFIG_SMP */
78
79static inline int register_cpu_notifier(struct notifier_block *nb)
80{
81 return 0;
82}
83
84static inline void unregister_cpu_notifier(struct notifier_block *nb)
85{
86}
87
88static inline void cpu_hotplug_init(void)
89{
90}
91
92static inline void cpu_maps_update_begin(void)
93{
94}
95
96static inline void cpu_maps_update_done(void)
97{
98}
99
100#endif /* CONFIG_SMP */
101extern struct sysdev_class cpu_sysdev_class;
102
103#ifdef CONFIG_HOTPLUG_CPU
104/* Stop CPUs going up and down. */
105
106static inline void cpuhotplug_mutex_lock(struct mutex *cpu_hp_mutex)
107{
108 mutex_lock(cpu_hp_mutex);
109}
110
111static inline void cpuhotplug_mutex_unlock(struct mutex *cpu_hp_mutex)
112{
113 mutex_unlock(cpu_hp_mutex);
114}
115
116extern void get_online_cpus(void);
117extern void put_online_cpus(void);
118#define hotcpu_notifier(fn, pri) { \
119 static struct notifier_block fn##_nb __cpuinitdata = \
120 { .notifier_call = fn, .priority = pri }; \
121 register_cpu_notifier(&fn##_nb); \
122}
123#define register_hotcpu_notifier(nb) register_cpu_notifier(nb)
124#define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb)
125int cpu_down(unsigned int cpu);
126
127#else /* CONFIG_HOTPLUG_CPU */
128
129static inline void cpuhotplug_mutex_lock(struct mutex *cpu_hp_mutex)
130{ }
131static inline void cpuhotplug_mutex_unlock(struct mutex *cpu_hp_mutex)
132{ }
133
134#define get_online_cpus() do { } while (0)
135#define put_online_cpus() do { } while (0)
136#define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0)
137/* These aren't inline functions due to a GCC bug. */
138#define register_hotcpu_notifier(nb) ({ (void)(nb); 0; })
139#define unregister_hotcpu_notifier(nb) ({ (void)(nb); })
140#endif /* CONFIG_HOTPLUG_CPU */
141
142#ifdef CONFIG_PM_SLEEP_SMP
143extern int suspend_cpu_hotplug;
144
145extern int disable_nonboot_cpus(void);
146extern void enable_nonboot_cpus(void);
147#else /* !CONFIG_PM_SLEEP_SMP */
148#define suspend_cpu_hotplug 0
149
150static inline int disable_nonboot_cpus(void) { return 0; }
151static inline void enable_nonboot_cpus(void) {}
152#endif /* !CONFIG_PM_SLEEP_SMP */
153
154#endif /* _LINUX_CPU_H_ */