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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#if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE)
52#define cpu_notifier(fn, pri) { \
53 static struct notifier_block fn##_nb __cpuinitdata = \
54 { .notifier_call = fn, .priority = pri }; \
55 register_cpu_notifier(&fn##_nb); \
56}
57#else /* #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
58#define cpu_notifier(fn, pri) do { (void)(fn); } while (0)
59#endif /* #else #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
60#ifdef CONFIG_HOTPLUG_CPU
61extern int register_cpu_notifier(struct notifier_block *nb);
62extern void unregister_cpu_notifier(struct notifier_block *nb);
63#else
64
65#ifndef MODULE
66extern int register_cpu_notifier(struct notifier_block *nb);
67#else
68static inline int register_cpu_notifier(struct notifier_block *nb)
69{
70 return 0;
71}
72#endif
73
74static inline void unregister_cpu_notifier(struct notifier_block *nb)
75{
76}
77#endif
78
79int cpu_up(unsigned int cpu);
80void notify_cpu_starting(unsigned int cpu);
81extern void cpu_maps_update_begin(void);
82extern void cpu_maps_update_done(void);
83
84#else /* CONFIG_SMP */
85
86#define cpu_notifier(fn, pri) do { (void)(fn); } while (0)
87
88static inline int register_cpu_notifier(struct notifier_block *nb)
89{
90 return 0;
91}
92
93static inline void unregister_cpu_notifier(struct notifier_block *nb)
94{
95}
96
97static inline void cpu_maps_update_begin(void)
98{
99}
100
101static inline void cpu_maps_update_done(void)
102{
103}
104
105#endif /* CONFIG_SMP */
106extern struct sysdev_class cpu_sysdev_class;
107
108#ifdef CONFIG_HOTPLUG_CPU
109/* Stop CPUs going up and down. */
110
111extern void get_online_cpus(void);
112extern void put_online_cpus(void);
113#define hotcpu_notifier(fn, pri) cpu_notifier(fn, pri)
114#define register_hotcpu_notifier(nb) register_cpu_notifier(nb)
115#define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb)
116int cpu_down(unsigned int cpu);
117
118#else /* CONFIG_HOTPLUG_CPU */
119
120#define get_online_cpus() do { } while (0)
121#define put_online_cpus() do { } while (0)
122#define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0)
123/* These aren't inline functions due to a GCC bug. */
124#define register_hotcpu_notifier(nb) ({ (void)(nb); 0; })
125#define unregister_hotcpu_notifier(nb) ({ (void)(nb); })
126#endif /* CONFIG_HOTPLUG_CPU */
127
128#ifdef CONFIG_PM_SLEEP_SMP
129extern int suspend_cpu_hotplug;
130
131extern int disable_nonboot_cpus(void);
132extern void enable_nonboot_cpus(void);
133#else /* !CONFIG_PM_SLEEP_SMP */
134#define suspend_cpu_hotplug 0
135
136static inline int disable_nonboot_cpus(void) { return 0; }
137static inline void enable_nonboot_cpus(void) {}
138#endif /* !CONFIG_PM_SLEEP_SMP */
139
140#endif /* _LINUX_CPU_H_ */