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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
27struct cpu {
28 int node_id; /* The node which contains the CPU */
29 int hotpluggable; /* creates sysfs control file if hotpluggable */
30 struct sys_device sysdev;
31};
32
33extern int register_cpu(struct cpu *cpu, int num);
34extern struct sys_device *get_cpu_sysdev(unsigned cpu);
35
36extern int cpu_add_sysdev_attr(struct sysdev_attribute *attr);
37extern void cpu_remove_sysdev_attr(struct sysdev_attribute *attr);
38
39extern int cpu_add_sysdev_attr_group(struct attribute_group *attrs);
40extern void cpu_remove_sysdev_attr_group(struct attribute_group *attrs);
41
42extern int sched_create_sysfs_power_savings_entries(struct sysdev_class *cls);
43
44#ifdef CONFIG_HOTPLUG_CPU
45extern void unregister_cpu(struct cpu *cpu);
46#endif
47struct notifier_block;
48
49#ifdef CONFIG_SMP
50/* Need to know about CPUs going up/down? */
51#ifdef CONFIG_HOTPLUG_CPU
52extern int register_cpu_notifier(struct notifier_block *nb);
53extern void unregister_cpu_notifier(struct notifier_block *nb);
54#else
55
56#ifndef MODULE
57extern int register_cpu_notifier(struct notifier_block *nb);
58#else
59static inline int register_cpu_notifier(struct notifier_block *nb)
60{
61 return 0;
62}
63#endif
64
65static inline void unregister_cpu_notifier(struct notifier_block *nb)
66{
67}
68#endif
69
70int cpu_up(unsigned int cpu);
71void notify_cpu_starting(unsigned int cpu);
72extern void cpu_hotplug_init(void);
73extern void cpu_maps_update_begin(void);
74extern void cpu_maps_update_done(void);
75
76#else /* CONFIG_SMP */
77
78static inline int register_cpu_notifier(struct notifier_block *nb)
79{
80 return 0;
81}
82
83static inline void unregister_cpu_notifier(struct notifier_block *nb)
84{
85}
86
87static inline void cpu_hotplug_init(void)
88{
89}
90
91static inline void cpu_maps_update_begin(void)
92{
93}
94
95static inline void cpu_maps_update_done(void)
96{
97}
98
99#endif /* CONFIG_SMP */
100extern struct sysdev_class cpu_sysdev_class;
101
102#ifdef CONFIG_HOTPLUG_CPU
103/* Stop CPUs going up and down. */
104
105extern void get_online_cpus(void);
106extern void put_online_cpus(void);
107#define hotcpu_notifier(fn, pri) { \
108 static struct notifier_block fn##_nb __cpuinitdata = \
109 { .notifier_call = fn, .priority = pri }; \
110 register_cpu_notifier(&fn##_nb); \
111}
112#define register_hotcpu_notifier(nb) register_cpu_notifier(nb)
113#define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb)
114int cpu_down(unsigned int cpu);
115
116#else /* CONFIG_HOTPLUG_CPU */
117
118#define get_online_cpus() do { } while (0)
119#define put_online_cpus() do { } while (0)
120#define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0)
121/* These aren't inline functions due to a GCC bug. */
122#define register_hotcpu_notifier(nb) ({ (void)(nb); 0; })
123#define unregister_hotcpu_notifier(nb) ({ (void)(nb); })
124#endif /* CONFIG_HOTPLUG_CPU */
125
126#ifdef CONFIG_PM_SLEEP_SMP
127extern int suspend_cpu_hotplug;
128
129extern int disable_nonboot_cpus(void);
130extern void enable_nonboot_cpus(void);
131#else /* !CONFIG_PM_SLEEP_SMP */
132#define suspend_cpu_hotplug 0
133
134static inline int disable_nonboot_cpus(void) { return 0; }
135static inline void enable_nonboot_cpus(void) {}
136#endif /* !CONFIG_PM_SLEEP_SMP */
137
138#endif /* _LINUX_CPU_H_ */