2 * include/linux/cpu.h - generic cpu definition
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.
8 * Basic handling of the devices is done in drivers/base/cpu.c
9 * and system devices are handled in drivers/base/sys.c.
11 * CPUs are exported via sysfs in the class/cpu/devices/
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
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>
29 int node_id; /* The node which contains the CPU */
30 int hotpluggable; /* creates sysfs control file if hotpluggable */
31 struct sys_device sysdev;
34 extern int register_cpu(struct cpu *cpu, int num);
35 extern struct sys_device *get_cpu_sysdev(unsigned cpu);
37 extern int cpu_add_sysdev_attr(struct sysdev_attribute *attr);
38 extern void cpu_remove_sysdev_attr(struct sysdev_attribute *attr);
40 extern int cpu_add_sysdev_attr_group(struct attribute_group *attrs);
41 extern void cpu_remove_sysdev_attr_group(struct attribute_group *attrs);
43 extern int sched_create_sysfs_power_savings_entries(struct sysdev_class *cls);
45 #ifdef CONFIG_HOTPLUG_CPU
46 extern void unregister_cpu(struct cpu *cpu);
48 struct notifier_block;
51 /* Need to know about CPUs going up/down? */
52 #ifdef CONFIG_HOTPLUG_CPU
53 extern int register_cpu_notifier(struct notifier_block *nb);
54 extern void unregister_cpu_notifier(struct notifier_block *nb);
58 extern int register_cpu_notifier(struct notifier_block *nb);
60 static inline int register_cpu_notifier(struct notifier_block *nb)
66 static inline void unregister_cpu_notifier(struct notifier_block *nb)
71 int cpu_up(unsigned int cpu);
73 extern void cpu_hotplug_init(void);
77 static inline int register_cpu_notifier(struct notifier_block *nb)
82 static inline void unregister_cpu_notifier(struct notifier_block *nb)
86 static inline void cpu_hotplug_init(void)
90 #endif /* CONFIG_SMP */
91 extern struct sysdev_class cpu_sysdev_class;
92 extern void cpu_maps_update_begin(void);
93 extern void cpu_maps_update_done(void);
95 #ifdef CONFIG_HOTPLUG_CPU
96 /* Stop CPUs going up and down. */
98 static inline void cpuhotplug_mutex_lock(struct mutex *cpu_hp_mutex)
100 mutex_lock(cpu_hp_mutex);
103 static inline void cpuhotplug_mutex_unlock(struct mutex *cpu_hp_mutex)
105 mutex_unlock(cpu_hp_mutex);
108 extern void get_online_cpus(void);
109 extern void put_online_cpus(void);
110 #define hotcpu_notifier(fn, pri) { \
111 static struct notifier_block fn##_nb = \
112 { .notifier_call = fn, .priority = pri }; \
113 register_cpu_notifier(&fn##_nb); \
115 #define register_hotcpu_notifier(nb) register_cpu_notifier(nb)
116 #define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb)
117 int cpu_down(unsigned int cpu);
119 #else /* CONFIG_HOTPLUG_CPU */
121 static inline void cpuhotplug_mutex_lock(struct mutex *cpu_hp_mutex)
123 static inline void cpuhotplug_mutex_unlock(struct mutex *cpu_hp_mutex)
126 #define get_online_cpus() do { } while (0)
127 #define put_online_cpus() do { } while (0)
128 #define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0)
129 /* These aren't inline functions due to a GCC bug. */
130 #define register_hotcpu_notifier(nb) ({ (void)(nb); 0; })
131 #define unregister_hotcpu_notifier(nb) ({ (void)(nb); })
132 #endif /* CONFIG_HOTPLUG_CPU */
134 #ifdef CONFIG_PM_SLEEP_SMP
135 extern int suspend_cpu_hotplug;
137 extern int disable_nonboot_cpus(void);
138 extern void enable_nonboot_cpus(void);
139 #else /* !CONFIG_PM_SLEEP_SMP */
140 #define suspend_cpu_hotplug 0
142 static inline int disable_nonboot_cpus(void) { return 0; }
143 static inline void enable_nonboot_cpus(void) {}
144 #endif /* !CONFIG_PM_SLEEP_SMP */
146 #endif /* _LINUX_CPU_H_ */