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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * drivers/base/cpu.c - basic CPU class support | |
3 | */ | |
4 | ||
5 | #include <linux/sysdev.h> | |
6 | #include <linux/module.h> | |
7 | #include <linux/init.h> | |
8 | #include <linux/cpu.h> | |
9 | #include <linux/topology.h> | |
10 | #include <linux/device.h> | |
11 | ||
12 | ||
13 | struct sysdev_class cpu_sysdev_class = { | |
14 | set_kset_name("cpu"), | |
15 | }; | |
16 | EXPORT_SYMBOL(cpu_sysdev_class); | |
17 | ||
18 | #ifdef CONFIG_HOTPLUG_CPU | |
19 | static ssize_t show_online(struct sys_device *dev, char *buf) | |
20 | { | |
21 | struct cpu *cpu = container_of(dev, struct cpu, sysdev); | |
22 | ||
23 | return sprintf(buf, "%u\n", !!cpu_online(cpu->sysdev.id)); | |
24 | } | |
25 | ||
26 | static ssize_t store_online(struct sys_device *dev, const char *buf, | |
27 | size_t count) | |
28 | { | |
29 | struct cpu *cpu = container_of(dev, struct cpu, sysdev); | |
30 | ssize_t ret; | |
31 | ||
32 | switch (buf[0]) { | |
33 | case '0': | |
34 | ret = cpu_down(cpu->sysdev.id); | |
35 | if (!ret) | |
36 | kobject_hotplug(&dev->kobj, KOBJ_OFFLINE); | |
37 | break; | |
38 | case '1': | |
39 | ret = cpu_up(cpu->sysdev.id); | |
40 | break; | |
41 | default: | |
42 | ret = -EINVAL; | |
43 | } | |
44 | ||
45 | if (ret >= 0) | |
46 | ret = count; | |
47 | return ret; | |
48 | } | |
49 | static SYSDEV_ATTR(online, 0600, show_online, store_online); | |
50 | ||
51 | static void __devinit register_cpu_control(struct cpu *cpu) | |
52 | { | |
53 | sysdev_create_file(&cpu->sysdev, &attr_online); | |
54 | } | |
55 | void unregister_cpu(struct cpu *cpu, struct node *root) | |
56 | { | |
57 | ||
58 | if (root) | |
59 | sysfs_remove_link(&root->sysdev.kobj, | |
60 | kobject_name(&cpu->sysdev.kobj)); | |
61 | sysdev_remove_file(&cpu->sysdev, &attr_online); | |
62 | ||
63 | sysdev_unregister(&cpu->sysdev); | |
64 | ||
65 | return; | |
66 | } | |
67 | #else /* ... !CONFIG_HOTPLUG_CPU */ | |
68 | static inline void register_cpu_control(struct cpu *cpu) | |
69 | { | |
70 | } | |
71 | #endif /* CONFIG_HOTPLUG_CPU */ | |
72 | ||
73 | /* | |
74 | * register_cpu - Setup a driverfs device for a CPU. | |
75 | * @cpu - Callers can set the cpu->no_control field to 1, to indicate not to | |
76 | * generate a control file in sysfs for this CPU. | |
77 | * @num - CPU number to use when creating the device. | |
78 | * | |
79 | * Initialize and register the CPU device. | |
80 | */ | |
81 | int __devinit register_cpu(struct cpu *cpu, int num, struct node *root) | |
82 | { | |
83 | int error; | |
84 | ||
85 | cpu->node_id = cpu_to_node(num); | |
86 | cpu->sysdev.id = num; | |
87 | cpu->sysdev.cls = &cpu_sysdev_class; | |
88 | ||
89 | error = sysdev_register(&cpu->sysdev); | |
90 | if (!error && root) | |
91 | error = sysfs_create_link(&root->sysdev.kobj, | |
92 | &cpu->sysdev.kobj, | |
93 | kobject_name(&cpu->sysdev.kobj)); | |
94 | if (!error && !cpu->no_control) | |
95 | register_cpu_control(cpu); | |
96 | return error; | |
97 | } | |
98 | ||
99 | ||
100 | ||
101 | int __init cpu_dev_init(void) | |
102 | { | |
103 | return sysdev_class_register(&cpu_sysdev_class); | |
104 | } |