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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);
46extern ssize_t arch_cpu_probe(const char *, size_t);
47extern ssize_t arch_cpu_release(const char *, size_t);
48#endif
49struct notifier_block;
50
51#ifdef CONFIG_SMP
52/* Need to know about CPUs going up/down? */
53#if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE)
54#define cpu_notifier(fn, pri) { \
55 static struct notifier_block fn##_nb __cpuinitdata = \
56 { .notifier_call = fn, .priority = pri }; \
57 register_cpu_notifier(&fn##_nb); \
58}
59#else /* #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
60#define cpu_notifier(fn, pri) do { (void)(fn); } while (0)
61#endif /* #else #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
62#ifdef CONFIG_HOTPLUG_CPU
63extern int register_cpu_notifier(struct notifier_block *nb);
64extern void unregister_cpu_notifier(struct notifier_block *nb);
65#else
66
67#ifndef MODULE
68extern int register_cpu_notifier(struct notifier_block *nb);
69#else
70static inline int register_cpu_notifier(struct notifier_block *nb)
71{
72 return 0;
73}
74#endif
75
76static inline void unregister_cpu_notifier(struct notifier_block *nb)
77{
78}
79#endif
80
81int cpu_up(unsigned int cpu);
82void notify_cpu_starting(unsigned int cpu);
83extern void cpu_maps_update_begin(void);
84extern void cpu_maps_update_done(void);
85
86#else /* CONFIG_SMP */
87
88#define cpu_notifier(fn, pri) do { (void)(fn); } while (0)
89
90static inline int register_cpu_notifier(struct notifier_block *nb)
91{
92 return 0;
93}
94
95static inline void unregister_cpu_notifier(struct notifier_block *nb)
96{
97}
98
99static inline void cpu_maps_update_begin(void)
100{
101}
102
103static inline void cpu_maps_update_done(void)
104{
105}
106
107#endif /* CONFIG_SMP */
108extern struct sysdev_class cpu_sysdev_class;
109
110#ifdef CONFIG_HOTPLUG_CPU
111/* Stop CPUs going up and down. */
112
113extern void get_online_cpus(void);
114extern void put_online_cpus(void);
115#define hotcpu_notifier(fn, pri) cpu_notifier(fn, pri)
116#define register_hotcpu_notifier(nb) register_cpu_notifier(nb)
117#define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb)
118int cpu_down(unsigned int cpu);
119
120#ifdef CONFIG_ARCH_CPU_PROBE_RELEASE
121extern void cpu_hotplug_driver_lock(void);
122extern void cpu_hotplug_driver_unlock(void);
123#else
124static inline void cpu_hotplug_driver_lock(void)
125{
126}
127
128static inline void cpu_hotplug_driver_unlock(void)
129{
130}
131#endif
132
133#else /* CONFIG_HOTPLUG_CPU */
134
135#define get_online_cpus() do { } while (0)
136#define put_online_cpus() do { } while (0)
137#define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0)
138/* These aren't inline functions due to a GCC bug. */
139#define register_hotcpu_notifier(nb) ({ (void)(nb); 0; })
140#define unregister_hotcpu_notifier(nb) ({ (void)(nb); })
141#endif /* CONFIG_HOTPLUG_CPU */
142
143#ifdef CONFIG_PM_SLEEP_SMP
144extern int suspend_cpu_hotplug;
145
146extern int disable_nonboot_cpus(void);
147extern void enable_nonboot_cpus(void);
148#else /* !CONFIG_PM_SLEEP_SMP */
149#define suspend_cpu_hotplug 0
150
151static inline int disable_nonboot_cpus(void) { return 0; }
152static inline void enable_nonboot_cpus(void) {}
153#endif /* !CONFIG_PM_SLEEP_SMP */
154
155#endif /* _LINUX_CPU_H_ */