/* * include/linux/cpu.h - generic cpu definition * * This is mainly for topological representation. We define the * basic 'struct cpu' here, which can be embedded in per-arch * definitions of processors. * * Basic handling of the devices is done in drivers/base/cpu.c * and system devices are handled in drivers/base/sys.c. * * CPUs are exported via sysfs in the class/cpu/devices/ * directory. * * Per-cpu interfaces can be implemented using a struct device_interface. * See the following for how to do this: * - drivers/base/intf.c * - Documentation/driver-model/interface.txt */ #ifndef _LINUX_CPU_H_ #define _LINUX_CPU_H_ #include <linux/sysdev.h> #include <linux/node.h> #include <linux/compiler.h> #include <linux/cpumask.h> struct cpu { int node_id; /* The node which contains the CPU */ int hotpluggable; /* creates sysfs control file if hotpluggable */ struct sys_device sysdev; }; extern int register_cpu(struct cpu *cpu, int num); extern struct sys_device *get_cpu_sysdev(unsigned cpu); extern int cpu_add_sysdev_attr(struct sysdev_attribute *attr); extern void cpu_remove_sysdev_attr(struct sysdev_attribute *attr); extern int cpu_add_sysdev_attr_group(struct attribute_group *attrs); extern void cpu_remove_sysdev_attr_group(struct attribute_group *attrs); extern int sched_create_sysfs_power_savings_entries(struct sysdev_class *cls); #ifdef CONFIG_HOTPLUG_CPU extern void unregister_cpu(struct cpu *cpu); #endif struct notifier_block; #ifdef CONFIG_SMP /* Need to know about CPUs going up/down? */ #ifdef CONFIG_HOTPLUG_CPU extern int register_cpu_notifier(struct notifier_block *nb); extern void unregister_cpu_notifier(struct notifier_block *nb); #else #ifndef MODULE extern int register_cpu_notifier(struct notifier_block *nb); #else static inline int register_cpu_notifier(struct notifier_block *nb) { return 0; } #endif static inline void unregister_cpu_notifier(struct notifier_block *nb) { } #endif int cpu_up(unsigned int cpu); void notify_cpu_starting(unsigned int cpu); extern void cpu_maps_update_begin(void); extern void cpu_maps_update_done(void); #else /* CONFIG_SMP */ static inline int register_cpu_notifier(struct notifier_block *nb) { return 0; } static inline void unregister_cpu_notifier(struct notifier_block *nb) { } static inline void cpu_maps_update_begin(void) { } static inline void cpu_maps_update_done(void) { } #endif /* CONFIG_SMP */ extern struct sysdev_class cpu_sysdev_class; #ifdef CONFIG_HOTPLUG_CPU /* Stop CPUs going up and down. */ extern void get_online_cpus(void); extern void put_online_cpus(void); #define hotcpu_notifier(fn, pri) { \ static struct notifier_block fn##_nb __cpuinitdata = \ { .notifier_call = fn, .priority = pri }; \ register_cpu_notifier(&fn##_nb); \ } #define register_hotcpu_notifier(nb) register_cpu_notifier(nb) #define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb) int cpu_down(unsigned int cpu); #else /* CONFIG_HOTPLUG_CPU */ #define get_online_cpus() do { } while (0) #define put_online_cpus() do { } while (0) #define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0) /* These aren't inline functions due to a GCC bug. */ #define register_hotcpu_notifier(nb) ({ (void)(nb); 0; }) #define unregister_hotcpu_notifier(nb) ({ (void)(nb); }) #endif /* CONFIG_HOTPLUG_CPU */ #ifdef CONFIG_PM_SLEEP_SMP extern int suspend_cpu_hotplug; extern int disable_nonboot_cpus(void); extern void enable_nonboot_cpus(void); #else /* !CONFIG_PM_SLEEP_SMP */ #define suspend_cpu_hotplug 0 static inline int disable_nonboot_cpus(void) { return 0; } static inline void enable_nonboot_cpus(void) {} #endif /* !CONFIG_PM_SLEEP_SMP */ #endif /* _LINUX_CPU_H_ */