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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 | * |
11 | * CPUs are exported via sysfs in the class/cpu/devices/ |
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 | |
27 | struct cpu { |
28 | int node_id; /* The node which contains the CPU */ |
29 | int hotpluggable; /* creates sysfs control file if hotpluggable */ |
30 | struct sys_device sysdev; |
31 | }; |
32 | |
33 | extern int register_cpu(struct cpu *cpu, int num); |
34 | extern struct sys_device *get_cpu_sysdev(unsigned cpu); |
35 | |
36 | extern int cpu_add_sysdev_attr(struct sysdev_attribute *attr); |
37 | extern void cpu_remove_sysdev_attr(struct sysdev_attribute *attr); |
38 | |
39 | extern int cpu_add_sysdev_attr_group(struct attribute_group *attrs); |
40 | extern void cpu_remove_sysdev_attr_group(struct attribute_group *attrs); |
41 | |
42 | extern int sched_create_sysfs_power_savings_entries(struct sysdev_class *cls); |
43 | |
44 | #ifdef CONFIG_HOTPLUG_CPU |
45 | extern void unregister_cpu(struct cpu *cpu); |
46 | #endif |
47 | struct notifier_block; |
48 | |
49 | #ifdef CONFIG_SMP |
50 | /* Need to know about CPUs going up/down? */ |
51 | #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) |
52 | #define cpu_notifier(fn, pri) { \ |
53 | static struct notifier_block fn##_nb __cpuinitdata = \ |
54 | { .notifier_call = fn, .priority = pri }; \ |
55 | register_cpu_notifier(&fn##_nb); \ |
56 | } |
57 | #else /* #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */ |
58 | #define cpu_notifier(fn, pri) do { (void)(fn); } while (0) |
59 | #endif /* #else #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */ |
60 | #ifdef CONFIG_HOTPLUG_CPU |
61 | extern int register_cpu_notifier(struct notifier_block *nb); |
62 | extern void unregister_cpu_notifier(struct notifier_block *nb); |
63 | #else |
64 | |
65 | #ifndef MODULE |
66 | extern int register_cpu_notifier(struct notifier_block *nb); |
67 | #else |
68 | static inline int register_cpu_notifier(struct notifier_block *nb) |
69 | { |
70 | return 0; |
71 | } |
72 | #endif |
73 | |
74 | static inline void unregister_cpu_notifier(struct notifier_block *nb) |
75 | { |
76 | } |
77 | #endif |
78 | |
79 | int cpu_up(unsigned int cpu); |
80 | void notify_cpu_starting(unsigned int cpu); |
81 | extern void cpu_maps_update_begin(void); |
82 | extern void cpu_maps_update_done(void); |
83 | |
84 | #else /* CONFIG_SMP */ |
85 | |
86 | #define cpu_notifier(fn, pri) do { (void)(fn); } while (0) |
87 | |
88 | static inline int register_cpu_notifier(struct notifier_block *nb) |
89 | { |
90 | return 0; |
91 | } |
92 | |
93 | static inline void unregister_cpu_notifier(struct notifier_block *nb) |
94 | { |
95 | } |
96 | |
97 | static inline void cpu_maps_update_begin(void) |
98 | { |
99 | } |
100 | |
101 | static inline void cpu_maps_update_done(void) |
102 | { |
103 | } |
104 | |
105 | #endif /* CONFIG_SMP */ |
106 | extern struct sysdev_class cpu_sysdev_class; |
107 | |
108 | #ifdef CONFIG_HOTPLUG_CPU |
109 | /* Stop CPUs going up and down. */ |
110 | |
111 | extern void get_online_cpus(void); |
112 | extern void put_online_cpus(void); |
113 | #define hotcpu_notifier(fn, pri) cpu_notifier(fn, pri) |
114 | #define register_hotcpu_notifier(nb) register_cpu_notifier(nb) |
115 | #define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb) |
116 | int cpu_down(unsigned int cpu); |
117 | |
118 | #else /* CONFIG_HOTPLUG_CPU */ |
119 | |
120 | #define get_online_cpus() do { } while (0) |
121 | #define put_online_cpus() do { } while (0) |
122 | #define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0) |
123 | /* These aren't inline functions due to a GCC bug. */ |
124 | #define register_hotcpu_notifier(nb) ({ (void)(nb); 0; }) |
125 | #define unregister_hotcpu_notifier(nb) ({ (void)(nb); }) |
126 | #endif /* CONFIG_HOTPLUG_CPU */ |
127 | |
128 | #ifdef CONFIG_PM_SLEEP_SMP |
129 | extern int suspend_cpu_hotplug; |
130 | |
131 | extern int disable_nonboot_cpus(void); |
132 | extern void enable_nonboot_cpus(void); |
133 | #else /* !CONFIG_PM_SLEEP_SMP */ |
134 | #define suspend_cpu_hotplug 0 |
135 | |
136 | static inline int disable_nonboot_cpus(void) { return 0; } |
137 | static inline void enable_nonboot_cpus(void) {} |
138 | #endif /* !CONFIG_PM_SLEEP_SMP */ |
139 | |
140 | #endif /* _LINUX_CPU_H_ */ |
141 |
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