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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 *); | |
35 | #ifdef CONFIG_HOTPLUG_CPU | |
36 | extern void unregister_cpu(struct cpu *, struct node *); | |
37 | #endif | |
38 | struct notifier_block; | |
39 | ||
40 | #ifdef CONFIG_SMP | |
41 | /* Need to know about CPUs going up/down? */ | |
42 | extern int register_cpu_notifier(struct notifier_block *nb); | |
43 | extern void unregister_cpu_notifier(struct notifier_block *nb); | |
44 | ||
45 | int cpu_up(unsigned int cpu); | |
46 | ||
47 | #else | |
48 | ||
49 | static inline int register_cpu_notifier(struct notifier_block *nb) | |
50 | { | |
51 | return 0; | |
52 | } | |
53 | static inline void unregister_cpu_notifier(struct notifier_block *nb) | |
54 | { | |
55 | } | |
56 | ||
57 | #endif /* CONFIG_SMP */ | |
58 | extern struct sysdev_class cpu_sysdev_class; | |
59 | ||
60 | #ifdef CONFIG_HOTPLUG_CPU | |
61 | /* Stop CPUs going up and down. */ | |
62 | extern struct semaphore cpucontrol; | |
63 | #define lock_cpu_hotplug() down(&cpucontrol) | |
64 | #define unlock_cpu_hotplug() up(&cpucontrol) | |
65 | #define lock_cpu_hotplug_interruptible() down_interruptible(&cpucontrol) | |
66 | #define hotcpu_notifier(fn, pri) { \ | |
67 | static struct notifier_block fn##_nb = \ | |
68 | { .notifier_call = fn, .priority = pri }; \ | |
69 | register_cpu_notifier(&fn##_nb); \ | |
70 | } | |
71 | int cpu_down(unsigned int cpu); | |
52a119fe | 72 | extern int __attribute__((weak)) smp_prepare_cpu(int cpu); |
1da177e4 LT |
73 | #define cpu_is_offline(cpu) unlikely(!cpu_online(cpu)) |
74 | #else | |
75 | #define lock_cpu_hotplug() do { } while (0) | |
76 | #define unlock_cpu_hotplug() do { } while (0) | |
77 | #define lock_cpu_hotplug_interruptible() 0 | |
78 | #define hotcpu_notifier(fn, pri) | |
79 | ||
80 | /* CPUs don't go offline once they're online w/o CONFIG_HOTPLUG_CPU */ | |
81 | static inline int cpu_is_offline(int cpu) { return 0; } | |
82 | #endif | |
83 | ||
84 | #endif /* _LINUX_CPU_H_ */ |