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> | |
f7dff2b1 | 27 | #include <linux/mutex.h> |
1da177e4 LT |
28 | |
29 | struct cpu { | |
30 | int node_id; /* The node which contains the CPU */ | |
72486f1f | 31 | int hotpluggable; /* creates sysfs control file if hotpluggable */ |
1da177e4 LT |
32 | struct sys_device sysdev; |
33 | }; | |
34 | ||
76b67ed9 | 35 | extern int register_cpu(struct cpu *cpu, int num); |
a29d642a | 36 | extern struct sys_device *get_cpu_sysdev(unsigned cpu); |
0344c6c5 CK |
37 | |
38 | extern int cpu_add_sysdev_attr(struct sysdev_attribute *attr); | |
39 | extern void cpu_remove_sysdev_attr(struct sysdev_attribute *attr); | |
40 | ||
41 | extern int cpu_add_sysdev_attr_group(struct attribute_group *attrs); | |
42 | extern void cpu_remove_sysdev_attr_group(struct attribute_group *attrs); | |
43 | ||
3367b994 RB |
44 | extern struct sysdev_attribute attr_sched_mc_power_savings; |
45 | extern struct sysdev_attribute attr_sched_smt_power_savings; | |
46 | extern int sched_create_sysfs_power_savings_entries(struct sysdev_class *cls); | |
0344c6c5 | 47 | |
1da177e4 | 48 | #ifdef CONFIG_HOTPLUG_CPU |
76b67ed9 | 49 | extern void unregister_cpu(struct cpu *cpu); |
1da177e4 LT |
50 | #endif |
51 | struct notifier_block; | |
52 | ||
53 | #ifdef CONFIG_SMP | |
54 | /* Need to know about CPUs going up/down? */ | |
65edc68c | 55 | #ifdef CONFIG_HOTPLUG_CPU |
47e627bc | 56 | extern int register_cpu_notifier(struct notifier_block *nb); |
1da177e4 | 57 | extern void unregister_cpu_notifier(struct notifier_block *nb); |
65edc68c | 58 | #else |
47e627bc AK |
59 | |
60 | #ifndef MODULE | |
61 | extern int register_cpu_notifier(struct notifier_block *nb); | |
62 | #else | |
63 | static inline int register_cpu_notifier(struct notifier_block *nb) | |
64 | { | |
65 | return 0; | |
66 | } | |
67 | #endif | |
68 | ||
65edc68c CS |
69 | static inline void unregister_cpu_notifier(struct notifier_block *nb) |
70 | { | |
71 | } | |
72 | #endif | |
1da177e4 LT |
73 | |
74 | int cpu_up(unsigned int cpu); | |
75 | ||
76 | #else | |
77 | ||
78 | static inline int register_cpu_notifier(struct notifier_block *nb) | |
79 | { | |
80 | return 0; | |
81 | } | |
82 | static inline void unregister_cpu_notifier(struct notifier_block *nb) | |
83 | { | |
84 | } | |
85 | ||
86 | #endif /* CONFIG_SMP */ | |
87 | extern struct sysdev_class cpu_sysdev_class; | |
88 | ||
89 | #ifdef CONFIG_HOTPLUG_CPU | |
90 | /* Stop CPUs going up and down. */ | |
f7dff2b1 GS |
91 | |
92 | static inline void cpuhotplug_mutex_lock(struct mutex *cpu_hp_mutex) | |
93 | { | |
94 | mutex_lock(cpu_hp_mutex); | |
95 | } | |
96 | ||
97 | static inline void cpuhotplug_mutex_unlock(struct mutex *cpu_hp_mutex) | |
98 | { | |
99 | mutex_unlock(cpu_hp_mutex); | |
100 | } | |
101 | ||
a9d9baa1 AR |
102 | extern void lock_cpu_hotplug(void); |
103 | extern void unlock_cpu_hotplug(void); | |
1da177e4 LT |
104 | #define hotcpu_notifier(fn, pri) { \ |
105 | static struct notifier_block fn##_nb = \ | |
106 | { .notifier_call = fn, .priority = pri }; \ | |
107 | register_cpu_notifier(&fn##_nb); \ | |
108 | } | |
39f4885c CS |
109 | #define register_hotcpu_notifier(nb) register_cpu_notifier(nb) |
110 | #define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb) | |
1da177e4 LT |
111 | int cpu_down(unsigned int cpu); |
112 | #define cpu_is_offline(cpu) unlikely(!cpu_online(cpu)) | |
f7dff2b1 GS |
113 | |
114 | #else /* CONFIG_HOTPLUG_CPU */ | |
115 | ||
116 | static inline void cpuhotplug_mutex_lock(struct mutex *cpu_hp_mutex) | |
117 | { } | |
118 | static inline void cpuhotplug_mutex_unlock(struct mutex *cpu_hp_mutex) | |
119 | { } | |
120 | ||
1da177e4 LT |
121 | #define lock_cpu_hotplug() do { } while (0) |
122 | #define unlock_cpu_hotplug() do { } while (0) | |
123 | #define lock_cpu_hotplug_interruptible() 0 | |
02316067 IM |
124 | #define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0) |
125 | #define register_hotcpu_notifier(nb) do { (void)(nb); } while (0) | |
126 | #define unregister_hotcpu_notifier(nb) do { (void)(nb); } while (0) | |
1da177e4 LT |
127 | |
128 | /* CPUs don't go offline once they're online w/o CONFIG_HOTPLUG_CPU */ | |
129 | static inline int cpu_is_offline(int cpu) { return 0; } | |
f7dff2b1 | 130 | #endif /* CONFIG_HOTPLUG_CPU */ |
1da177e4 | 131 | |
e3920fb4 | 132 | #ifdef CONFIG_SUSPEND_SMP |
1d64b9cb RW |
133 | extern int suspend_cpu_hotplug; |
134 | ||
e3920fb4 RW |
135 | extern int disable_nonboot_cpus(void); |
136 | extern void enable_nonboot_cpus(void); | |
137 | #else | |
1d64b9cb RW |
138 | #define suspend_cpu_hotplug 0 |
139 | ||
e3920fb4 RW |
140 | static inline int disable_nonboot_cpus(void) { return 0; } |
141 | static inline void enable_nonboot_cpus(void) {} | |
142 | #endif | |
143 | ||
1da177e4 | 144 | #endif /* _LINUX_CPU_H_ */ |