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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 <asm/semaphore.h>
27 #include <linux/mutex.h>
28
29 struct cpu {
30 int node_id; /* The node which contains the CPU */
31 int hotpluggable; /* creates sysfs control file if hotpluggable */
32 struct sys_device sysdev;
33 };
34
35 extern int register_cpu(struct cpu *cpu, int num);
36 extern struct sys_device *get_cpu_sysdev(unsigned cpu);
37
38 extern int cpu_add_sysdev_attr(struct sysdev_attribute *attr);
39 extern void cpu_remove_sysdev_attr(struct sysdev_attribute *attr);
40
41 extern int cpu_add_sysdev_attr_group(struct attribute_group *attrs);
42 extern void cpu_remove_sysdev_attr_group(struct attribute_group *attrs);
43
44 extern int sched_create_sysfs_power_savings_entries(struct sysdev_class *cls);
45
46 #ifdef CONFIG_HOTPLUG_CPU
47 extern void unregister_cpu(struct cpu *cpu);
48 #endif
49 struct notifier_block;
50
51 #ifdef CONFIG_SMP
52 /* Need to know about CPUs going up/down? */
53 #ifdef CONFIG_HOTPLUG_CPU
54 extern int register_cpu_notifier(struct notifier_block *nb);
55 extern void unregister_cpu_notifier(struct notifier_block *nb);
56 #else
57
58 #ifndef MODULE
59 extern int register_cpu_notifier(struct notifier_block *nb);
60 #else
61 static inline int register_cpu_notifier(struct notifier_block *nb)
62 {
63 return 0;
64 }
65 #endif
66
67 static inline void unregister_cpu_notifier(struct notifier_block *nb)
68 {
69 }
70 #endif
71
72 int cpu_up(unsigned int cpu);
73
74 extern void cpu_hotplug_init(void);
75
76 #else
77
78 static inline int register_cpu_notifier(struct notifier_block *nb)
79 {
80 return 0;
81 }
82
83 static inline void unregister_cpu_notifier(struct notifier_block *nb)
84 {
85 }
86
87 static inline void cpu_hotplug_init(void)
88 {
89 }
90
91 #endif /* CONFIG_SMP */
92 extern struct sysdev_class cpu_sysdev_class;
93 extern void cpu_maps_update_begin(void);
94 extern void cpu_maps_update_done(void);
95
96 #ifdef CONFIG_HOTPLUG_CPU
97 /* Stop CPUs going up and down. */
98
99 static inline void cpuhotplug_mutex_lock(struct mutex *cpu_hp_mutex)
100 {
101 mutex_lock(cpu_hp_mutex);
102 }
103
104 static inline void cpuhotplug_mutex_unlock(struct mutex *cpu_hp_mutex)
105 {
106 mutex_unlock(cpu_hp_mutex);
107 }
108
109 extern void get_online_cpus(void);
110 extern void put_online_cpus(void);
111 #define hotcpu_notifier(fn, pri) { \
112 static struct notifier_block fn##_nb = \
113 { .notifier_call = fn, .priority = pri }; \
114 register_cpu_notifier(&fn##_nb); \
115 }
116 #define register_hotcpu_notifier(nb) register_cpu_notifier(nb)
117 #define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb)
118 int cpu_down(unsigned int cpu);
119
120 #else /* CONFIG_HOTPLUG_CPU */
121
122 static inline void cpuhotplug_mutex_lock(struct mutex *cpu_hp_mutex)
123 { }
124 static inline void cpuhotplug_mutex_unlock(struct mutex *cpu_hp_mutex)
125 { }
126
127 #define get_online_cpus() do { } while (0)
128 #define put_online_cpus() do { } while (0)
129 #define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0)
130 /* These aren't inline functions due to a GCC bug. */
131 #define register_hotcpu_notifier(nb) ({ (void)(nb); 0; })
132 #define unregister_hotcpu_notifier(nb) ({ (void)(nb); })
133 #endif /* CONFIG_HOTPLUG_CPU */
134
135 #ifdef CONFIG_PM_SLEEP_SMP
136 extern int suspend_cpu_hotplug;
137
138 extern int disable_nonboot_cpus(void);
139 extern void enable_nonboot_cpus(void);
140 #else /* !CONFIG_PM_SLEEP_SMP */
141 #define suspend_cpu_hotplug 0
142
143 static inline int disable_nonboot_cpus(void) { return 0; }
144 static inline void enable_nonboot_cpus(void) {}
145 #endif /* !CONFIG_PM_SLEEP_SMP */
146
147 #endif /* _LINUX_CPU_H_ */