1c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* 2c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * include/linux/cpu.h - generic cpu definition 3c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 4c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * This is mainly for topological representation. We define the 5c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * basic 'struct cpu' here, which can be embedded in per-arch 6c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * definitions of processors. 7c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 8c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Basic handling of the devices is done in drivers/base/cpu.c 9c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * and system devices are handled in drivers/base/sys.c. 10c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 11c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * CPUs are exported via sysfs in the class/cpu/devices/ 12c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * directory. 13c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * 14c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * Per-cpu interfaces can be implemented using a struct device_interface. 15c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * See the following for how to do this: 16c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * - drivers/base/intf.c 17c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru * - Documentation/driver-model/interface.txt 18c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru */ 19c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifndef _LINUX_CPU_H_ 20c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define _LINUX_CPU_H_ 21c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 22c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/sysdev.h> 23c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/node.h> 24c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/compiler.h> 25c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <linux/cpumask.h> 26c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#include <asm/semaphore.h> 27c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 28c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct cpu { 29c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int node_id; /* The node which contains the CPU */ 30c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru int no_control; /* Should the sysfs control file be created? */ 31c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru struct sys_device sysdev; 32c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru}; 33c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 34c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int register_cpu(struct cpu *cpu, int num); 35c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct sys_device *get_cpu_sysdev(unsigned cpu); 36c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifdef CONFIG_HOTPLUG_CPU 37c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void unregister_cpu(struct cpu *cpu); 38c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 39c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustruct notifier_block; 40c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 41c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifdef CONFIG_SMP 42c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* Need to know about CPUs going up/down? */ 43c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern int register_cpu_notifier(struct notifier_block *nb); 44c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifdef CONFIG_HOTPLUG_CPU 45c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void unregister_cpu_notifier(struct notifier_block *nb); 46c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#else 47c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline void unregister_cpu_notifier(struct notifier_block *nb) 48c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 49c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 50c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 51c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 52c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruint cpu_up(unsigned int cpu); 53c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 54c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#else 55c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 56c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline int register_cpu_notifier(struct notifier_block *nb) 57c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 58c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru return 0; 59c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 60c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline void unregister_cpu_notifier(struct notifier_block *nb) 61c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru{ 62c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 63c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 64c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif /* CONFIG_SMP */ 65c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern struct sysdev_class cpu_sysdev_class; 66c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 67c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#ifdef CONFIG_HOTPLUG_CPU 68c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* Stop CPUs going up and down. */ 69c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void lock_cpu_hotplug(void); 70c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruextern void unlock_cpu_hotplug(void); 71c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define hotcpu_notifier(fn, pri) { \ 72c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru static struct notifier_block fn##_nb = \ 73c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru { .notifier_call = fn, .priority = pri }; \ 74c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru register_cpu_notifier(&fn##_nb); \ 75c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru} 76c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define register_hotcpu_notifier(nb) register_cpu_notifier(nb) 77c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb) 78c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queruint cpu_down(unsigned int cpu); 79c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define cpu_is_offline(cpu) unlikely(!cpu_online(cpu)) 80c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#else 81c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define lock_cpu_hotplug() do { } while (0) 82c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define unlock_cpu_hotplug() do { } while (0) 83c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define lock_cpu_hotplug_interruptible() 0 84c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define hotcpu_notifier(fn, pri) do { } while (0) 85c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define register_hotcpu_notifier(nb) do { } while (0) 86c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#define unregister_hotcpu_notifier(nb) do { } while (0) 87c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 88c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru/* CPUs don't go offline once they're online w/o CONFIG_HOTPLUG_CPU */ 89c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Querustatic inline int cpu_is_offline(int cpu) { return 0; } 90c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif 91c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru 92c559cd81139f97cecad1ad91a0b2e25a5936d53Jean-Baptiste Queru#endif /* _LINUX_CPU_H_ */ 93