projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
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 | * | |
| d51fe1be | 11 | * CPUs are exported via sysfs in the class/cpu/devices/ |
| 1da177e4 LT |
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 | ||
| 28 | struct cpu { | |
| 29 | int node_id; /* The node which contains the CPU */ | |
| 30 | int no_control; /* Should the sysfs control file be created? */ | |
| 31 | struct sys_device sysdev; | |
| 32 | }; | |
| 33 | ||
| 34 | extern int register_cpu(struct cpu *, int, struct node *); | |
| ad74557a | 35 | extern struct sys_device *get_cpu_sysdev(int cpu); |
| 1da177e4 LT |
36 | #ifdef CONFIG_HOTPLUG_CPU |
| 37 | extern void unregister_cpu(struct cpu *, struct node *); | |
| 38 | #endif | |
| 39 | struct notifier_block; | |
| 40 | ||
| 41 | #ifdef CONFIG_SMP | |
| 42 | /* Need to know about CPUs going up/down? */ | |
| 43 | extern int register_cpu_notifier(struct notifier_block *nb); | |
| 44 | extern void unregister_cpu_notifier(struct notifier_block *nb); | |
| 90d45d17 | 45 | extern int current_in_cpu_hotplug(void); |
| 1da177e4 LT |
46 | |
| 47 | int cpu_up(unsigned int cpu); | |
| 48 | ||
| 49 | #else | |
| 50 | ||
| 51 | static inline int register_cpu_notifier(struct notifier_block *nb) | |
| 52 | { | |
| 53 | return 0; | |
| 54 | } | |
| 55 | static inline void unregister_cpu_notifier(struct notifier_block *nb) | |
| 56 | { | |
| 57 | } | |
| 90d45d17 AR |
58 | static inline int current_in_cpu_hotplug(void) |
| 59 | { | |
| 60 | return 0; | |
| 61 | } | |
| 1da177e4 LT |
62 | |
| 63 | #endif /* CONFIG_SMP */ | |
| 64 | extern struct sysdev_class cpu_sysdev_class; | |
| 65 | ||
| 66 | #ifdef CONFIG_HOTPLUG_CPU | |
| 67 | /* Stop CPUs going up and down. */ | |
| a9d9baa1 AR |
68 | extern void lock_cpu_hotplug(void); |
| 69 | extern void unlock_cpu_hotplug(void); | |
| 70 | extern int lock_cpu_hotplug_interruptible(void); | |
| 1da177e4 LT |
71 | #define hotcpu_notifier(fn, pri) { \ |
| 72 | static struct notifier_block fn##_nb = \ | |
| 73 | { .notifier_call = fn, .priority = pri }; \ | |
| 74 | register_cpu_notifier(&fn##_nb); \ | |
| 75 | } | |
| 76 | int cpu_down(unsigned int cpu); | |
| 52a119fe | 77 | extern int __attribute__((weak)) smp_prepare_cpu(int cpu); |
| 1da177e4 LT |
78 | #define cpu_is_offline(cpu) unlikely(!cpu_online(cpu)) |
| 79 | #else | |
| 80 | #define lock_cpu_hotplug() do { } while (0) | |
| 81 | #define unlock_cpu_hotplug() do { } while (0) | |
| 82 | #define lock_cpu_hotplug_interruptible() 0 | |
| 83 | #define hotcpu_notifier(fn, pri) | |
| 84 | ||
| 85 | /* CPUs don't go offline once they're online w/o CONFIG_HOTPLUG_CPU */ | |
| 86 | static inline int cpu_is_offline(int cpu) { return 0; } | |
| 87 | #endif | |
| 88 | ||
| 89 | #endif /* _LINUX_CPU_H_ */ |