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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> | |
f7dff2b1 | 26 | #include <linux/mutex.h> |
1da177e4 LT |
27 | |
28 | struct cpu { | |
29 | int node_id; /* The node which contains the CPU */ | |
72486f1f | 30 | int hotpluggable; /* creates sysfs control file if hotpluggable */ |
1da177e4 LT |
31 | struct sys_device sysdev; |
32 | }; | |
33 | ||
76b67ed9 | 34 | extern int register_cpu(struct cpu *cpu, int num); |
a29d642a | 35 | extern struct sys_device *get_cpu_sysdev(unsigned cpu); |
0344c6c5 CK |
36 | |
37 | extern int cpu_add_sysdev_attr(struct sysdev_attribute *attr); | |
38 | extern void cpu_remove_sysdev_attr(struct sysdev_attribute *attr); | |
39 | ||
40 | extern int cpu_add_sysdev_attr_group(struct attribute_group *attrs); | |
41 | extern void cpu_remove_sysdev_attr_group(struct attribute_group *attrs); | |
42 | ||
3367b994 | 43 | extern int sched_create_sysfs_power_savings_entries(struct sysdev_class *cls); |
0344c6c5 | 44 | |
1da177e4 | 45 | #ifdef CONFIG_HOTPLUG_CPU |
76b67ed9 | 46 | extern void unregister_cpu(struct cpu *cpu); |
1da177e4 LT |
47 | #endif |
48 | struct notifier_block; | |
49 | ||
50 | #ifdef CONFIG_SMP | |
51 | /* Need to know about CPUs going up/down? */ | |
65edc68c | 52 | #ifdef CONFIG_HOTPLUG_CPU |
47e627bc | 53 | extern int register_cpu_notifier(struct notifier_block *nb); |
1da177e4 | 54 | extern void unregister_cpu_notifier(struct notifier_block *nb); |
65edc68c | 55 | #else |
47e627bc AK |
56 | |
57 | #ifndef MODULE | |
58 | extern int register_cpu_notifier(struct notifier_block *nb); | |
59 | #else | |
60 | static inline int register_cpu_notifier(struct notifier_block *nb) | |
61 | { | |
62 | return 0; | |
63 | } | |
64 | #endif | |
65 | ||
65edc68c CS |
66 | static inline void unregister_cpu_notifier(struct notifier_block *nb) |
67 | { | |
68 | } | |
69 | #endif | |
1da177e4 LT |
70 | |
71 | int cpu_up(unsigned int cpu); | |
d0d23b54 | 72 | extern void cpu_hotplug_init(void); |
3da1c84c ON |
73 | extern void cpu_maps_update_begin(void); |
74 | extern void cpu_maps_update_done(void); | |
d0d23b54 | 75 | |
3da1c84c | 76 | #else /* CONFIG_SMP */ |
1da177e4 LT |
77 | |
78 | static inline int register_cpu_notifier(struct notifier_block *nb) | |
79 | { | |
80 | return 0; | |
81 | } | |
d0d23b54 | 82 | |
1da177e4 LT |
83 | static inline void unregister_cpu_notifier(struct notifier_block *nb) |
84 | { | |
85 | } | |
86 | ||
d0d23b54 IM |
87 | static inline void cpu_hotplug_init(void) |
88 | { | |
89 | } | |
90 | ||
3da1c84c ON |
91 | static inline void cpu_maps_update_begin(void) |
92 | { | |
93 | } | |
94 | ||
95 | static inline void cpu_maps_update_done(void) | |
96 | { | |
97 | } | |
98 | ||
1da177e4 LT |
99 | #endif /* CONFIG_SMP */ |
100 | extern struct sysdev_class cpu_sysdev_class; | |
101 | ||
102 | #ifdef CONFIG_HOTPLUG_CPU | |
103 | /* Stop CPUs going up and down. */ | |
f7dff2b1 GS |
104 | |
105 | static inline void cpuhotplug_mutex_lock(struct mutex *cpu_hp_mutex) | |
106 | { | |
107 | mutex_lock(cpu_hp_mutex); | |
108 | } | |
109 | ||
110 | static inline void cpuhotplug_mutex_unlock(struct mutex *cpu_hp_mutex) | |
111 | { | |
112 | mutex_unlock(cpu_hp_mutex); | |
113 | } | |
114 | ||
86ef5c9a GS |
115 | extern void get_online_cpus(void); |
116 | extern void put_online_cpus(void); | |
1da177e4 | 117 | #define hotcpu_notifier(fn, pri) { \ |
f718e318 | 118 | static struct notifier_block fn##_nb __cpuinitdata = \ |
1da177e4 LT |
119 | { .notifier_call = fn, .priority = pri }; \ |
120 | register_cpu_notifier(&fn##_nb); \ | |
121 | } | |
39f4885c CS |
122 | #define register_hotcpu_notifier(nb) register_cpu_notifier(nb) |
123 | #define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb) | |
1da177e4 | 124 | int cpu_down(unsigned int cpu); |
f7dff2b1 GS |
125 | |
126 | #else /* CONFIG_HOTPLUG_CPU */ | |
127 | ||
128 | static inline void cpuhotplug_mutex_lock(struct mutex *cpu_hp_mutex) | |
129 | { } | |
130 | static inline void cpuhotplug_mutex_unlock(struct mutex *cpu_hp_mutex) | |
131 | { } | |
132 | ||
86ef5c9a GS |
133 | #define get_online_cpus() do { } while (0) |
134 | #define put_online_cpus() do { } while (0) | |
02316067 | 135 | #define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0) |
761bb431 SS |
136 | /* These aren't inline functions due to a GCC bug. */ |
137 | #define register_hotcpu_notifier(nb) ({ (void)(nb); 0; }) | |
138 | #define unregister_hotcpu_notifier(nb) ({ (void)(nb); }) | |
f7dff2b1 | 139 | #endif /* CONFIG_HOTPLUG_CPU */ |
1da177e4 | 140 | |
f3de4be9 | 141 | #ifdef CONFIG_PM_SLEEP_SMP |
1d64b9cb RW |
142 | extern int suspend_cpu_hotplug; |
143 | ||
e3920fb4 RW |
144 | extern int disable_nonboot_cpus(void); |
145 | extern void enable_nonboot_cpus(void); | |
f3de4be9 | 146 | #else /* !CONFIG_PM_SLEEP_SMP */ |
1d64b9cb RW |
147 | #define suspend_cpu_hotplug 0 |
148 | ||
e3920fb4 RW |
149 | static inline int disable_nonboot_cpus(void) { return 0; } |
150 | static inline void enable_nonboot_cpus(void) {} | |
f3de4be9 | 151 | #endif /* !CONFIG_PM_SLEEP_SMP */ |
e3920fb4 | 152 | |
1da177e4 | 153 | #endif /* _LINUX_CPU_H_ */ |