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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> | |
1da177e4 LT |
26 | |
27 | struct cpu { | |
28 | int node_id; /* The node which contains the CPU */ | |
72486f1f | 29 | int hotpluggable; /* creates sysfs control file if hotpluggable */ |
1da177e4 LT |
30 | struct sys_device sysdev; |
31 | }; | |
32 | ||
76b67ed9 | 33 | extern int register_cpu(struct cpu *cpu, int num); |
a29d642a | 34 | extern struct sys_device *get_cpu_sysdev(unsigned cpu); |
0344c6c5 CK |
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 | ||
3367b994 | 42 | extern int sched_create_sysfs_power_savings_entries(struct sysdev_class *cls); |
0344c6c5 | 43 | |
1da177e4 | 44 | #ifdef CONFIG_HOTPLUG_CPU |
76b67ed9 | 45 | extern void unregister_cpu(struct cpu *cpu); |
12633e80 NF |
46 | extern ssize_t arch_cpu_probe(const char *, size_t); |
47 | extern ssize_t arch_cpu_release(const char *, size_t); | |
1da177e4 LT |
48 | #endif |
49 | struct notifier_block; | |
50 | ||
50a323b7 TH |
51 | /* |
52 | * CPU notifier priorities. | |
53 | */ | |
54 | enum { | |
3a101d05 TH |
55 | /* |
56 | * SCHED_ACTIVE marks a cpu which is coming up active during | |
57 | * CPU_ONLINE and CPU_DOWN_FAILED and must be the first | |
58 | * notifier. CPUSET_ACTIVE adjusts cpuset according to | |
59 | * cpu_active mask right after SCHED_ACTIVE. During | |
60 | * CPU_DOWN_PREPARE, SCHED_INACTIVE and CPUSET_INACTIVE are | |
61 | * ordered in the similar way. | |
62 | * | |
63 | * This ordering guarantees consistent cpu_active mask and | |
64 | * migration behavior to all cpu notifiers. | |
65 | */ | |
66 | CPU_PRI_SCHED_ACTIVE = INT_MAX, | |
67 | CPU_PRI_CPUSET_ACTIVE = INT_MAX - 1, | |
68 | CPU_PRI_SCHED_INACTIVE = INT_MIN + 1, | |
69 | CPU_PRI_CPUSET_INACTIVE = INT_MIN, | |
70 | ||
50a323b7 TH |
71 | /* migration should happen before other stuff but after perf */ |
72 | CPU_PRI_PERF = 20, | |
73 | CPU_PRI_MIGRATION = 10, | |
db7bccf4 TH |
74 | /* prepare workqueues for other notifiers */ |
75 | CPU_PRI_WORKQUEUE = 5, | |
50a323b7 TH |
76 | }; |
77 | ||
1da177e4 LT |
78 | #ifdef CONFIG_SMP |
79 | /* Need to know about CPUs going up/down? */ | |
799e64f0 PM |
80 | #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) |
81 | #define cpu_notifier(fn, pri) { \ | |
82 | static struct notifier_block fn##_nb __cpuinitdata = \ | |
83 | { .notifier_call = fn, .priority = pri }; \ | |
84 | register_cpu_notifier(&fn##_nb); \ | |
85 | } | |
86 | #else /* #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */ | |
87 | #define cpu_notifier(fn, pri) do { (void)(fn); } while (0) | |
88 | #endif /* #else #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */ | |
65edc68c | 89 | #ifdef CONFIG_HOTPLUG_CPU |
47e627bc | 90 | extern int register_cpu_notifier(struct notifier_block *nb); |
1da177e4 | 91 | extern void unregister_cpu_notifier(struct notifier_block *nb); |
65edc68c | 92 | #else |
47e627bc AK |
93 | |
94 | #ifndef MODULE | |
95 | extern int register_cpu_notifier(struct notifier_block *nb); | |
96 | #else | |
97 | static inline int register_cpu_notifier(struct notifier_block *nb) | |
98 | { | |
99 | return 0; | |
100 | } | |
101 | #endif | |
102 | ||
65edc68c CS |
103 | static inline void unregister_cpu_notifier(struct notifier_block *nb) |
104 | { | |
105 | } | |
106 | #endif | |
1da177e4 LT |
107 | |
108 | int cpu_up(unsigned int cpu); | |
e545a614 | 109 | void notify_cpu_starting(unsigned int cpu); |
3da1c84c ON |
110 | extern void cpu_maps_update_begin(void); |
111 | extern void cpu_maps_update_done(void); | |
d0d23b54 | 112 | |
3da1c84c | 113 | #else /* CONFIG_SMP */ |
1da177e4 | 114 | |
799e64f0 PM |
115 | #define cpu_notifier(fn, pri) do { (void)(fn); } while (0) |
116 | ||
1da177e4 LT |
117 | static inline int register_cpu_notifier(struct notifier_block *nb) |
118 | { | |
119 | return 0; | |
120 | } | |
d0d23b54 | 121 | |
1da177e4 LT |
122 | static inline void unregister_cpu_notifier(struct notifier_block *nb) |
123 | { | |
124 | } | |
125 | ||
3da1c84c ON |
126 | static inline void cpu_maps_update_begin(void) |
127 | { | |
128 | } | |
129 | ||
130 | static inline void cpu_maps_update_done(void) | |
131 | { | |
132 | } | |
133 | ||
1da177e4 LT |
134 | #endif /* CONFIG_SMP */ |
135 | extern struct sysdev_class cpu_sysdev_class; | |
136 | ||
137 | #ifdef CONFIG_HOTPLUG_CPU | |
138 | /* Stop CPUs going up and down. */ | |
f7dff2b1 | 139 | |
86ef5c9a GS |
140 | extern void get_online_cpus(void); |
141 | extern void put_online_cpus(void); | |
799e64f0 | 142 | #define hotcpu_notifier(fn, pri) cpu_notifier(fn, pri) |
39f4885c CS |
143 | #define register_hotcpu_notifier(nb) register_cpu_notifier(nb) |
144 | #define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb) | |
1da177e4 | 145 | int cpu_down(unsigned int cpu); |
f7dff2b1 | 146 | |
51badebd GS |
147 | #ifdef CONFIG_ARCH_CPU_PROBE_RELEASE |
148 | extern void cpu_hotplug_driver_lock(void); | |
149 | extern void cpu_hotplug_driver_unlock(void); | |
150 | #else | |
151 | static inline void cpu_hotplug_driver_lock(void) | |
152 | { | |
153 | } | |
154 | ||
155 | static inline void cpu_hotplug_driver_unlock(void) | |
156 | { | |
157 | } | |
158 | #endif | |
159 | ||
f7dff2b1 GS |
160 | #else /* CONFIG_HOTPLUG_CPU */ |
161 | ||
86ef5c9a GS |
162 | #define get_online_cpus() do { } while (0) |
163 | #define put_online_cpus() do { } while (0) | |
02316067 | 164 | #define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0) |
761bb431 SS |
165 | /* These aren't inline functions due to a GCC bug. */ |
166 | #define register_hotcpu_notifier(nb) ({ (void)(nb); 0; }) | |
167 | #define unregister_hotcpu_notifier(nb) ({ (void)(nb); }) | |
f7dff2b1 | 168 | #endif /* CONFIG_HOTPLUG_CPU */ |
1da177e4 | 169 | |
f3de4be9 | 170 | #ifdef CONFIG_PM_SLEEP_SMP |
1d64b9cb RW |
171 | extern int suspend_cpu_hotplug; |
172 | ||
e3920fb4 RW |
173 | extern int disable_nonboot_cpus(void); |
174 | extern void enable_nonboot_cpus(void); | |
f3de4be9 | 175 | #else /* !CONFIG_PM_SLEEP_SMP */ |
1d64b9cb RW |
176 | #define suspend_cpu_hotplug 0 |
177 | ||
e3920fb4 RW |
178 | static inline int disable_nonboot_cpus(void) { return 0; } |
179 | static inline void enable_nonboot_cpus(void) {} | |
f3de4be9 | 180 | #endif /* !CONFIG_PM_SLEEP_SMP */ |
e3920fb4 | 181 | |
1da177e4 | 182 | #endif /* _LINUX_CPU_H_ */ |