Commit | Line | Data |
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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 | 12 | * directory. |
1da177e4 LT |
13 | */ |
14 | #ifndef _LINUX_CPU_H_ | |
15 | #define _LINUX_CPU_H_ | |
16 | ||
17 | #include <linux/sysdev.h> | |
18 | #include <linux/node.h> | |
19 | #include <linux/compiler.h> | |
20 | #include <linux/cpumask.h> | |
1da177e4 LT |
21 | |
22 | struct cpu { | |
23 | int node_id; /* The node which contains the CPU */ | |
72486f1f | 24 | int hotpluggable; /* creates sysfs control file if hotpluggable */ |
1da177e4 LT |
25 | struct sys_device sysdev; |
26 | }; | |
27 | ||
76b67ed9 | 28 | extern int register_cpu(struct cpu *cpu, int num); |
a29d642a | 29 | extern struct sys_device *get_cpu_sysdev(unsigned cpu); |
0344c6c5 CK |
30 | |
31 | extern int cpu_add_sysdev_attr(struct sysdev_attribute *attr); | |
32 | extern void cpu_remove_sysdev_attr(struct sysdev_attribute *attr); | |
33 | ||
34 | extern int cpu_add_sysdev_attr_group(struct attribute_group *attrs); | |
35 | extern void cpu_remove_sysdev_attr_group(struct attribute_group *attrs); | |
36 | ||
3367b994 | 37 | extern int sched_create_sysfs_power_savings_entries(struct sysdev_class *cls); |
0344c6c5 | 38 | |
1da177e4 | 39 | #ifdef CONFIG_HOTPLUG_CPU |
76b67ed9 | 40 | extern void unregister_cpu(struct cpu *cpu); |
12633e80 NF |
41 | extern ssize_t arch_cpu_probe(const char *, size_t); |
42 | extern ssize_t arch_cpu_release(const char *, size_t); | |
1da177e4 LT |
43 | #endif |
44 | struct notifier_block; | |
45 | ||
50a323b7 TH |
46 | /* |
47 | * CPU notifier priorities. | |
48 | */ | |
49 | enum { | |
3a101d05 TH |
50 | /* |
51 | * SCHED_ACTIVE marks a cpu which is coming up active during | |
52 | * CPU_ONLINE and CPU_DOWN_FAILED and must be the first | |
53 | * notifier. CPUSET_ACTIVE adjusts cpuset according to | |
54 | * cpu_active mask right after SCHED_ACTIVE. During | |
55 | * CPU_DOWN_PREPARE, SCHED_INACTIVE and CPUSET_INACTIVE are | |
56 | * ordered in the similar way. | |
57 | * | |
58 | * This ordering guarantees consistent cpu_active mask and | |
59 | * migration behavior to all cpu notifiers. | |
60 | */ | |
61 | CPU_PRI_SCHED_ACTIVE = INT_MAX, | |
62 | CPU_PRI_CPUSET_ACTIVE = INT_MAX - 1, | |
63 | CPU_PRI_SCHED_INACTIVE = INT_MIN + 1, | |
64 | CPU_PRI_CPUSET_INACTIVE = INT_MIN, | |
65 | ||
50a323b7 TH |
66 | /* migration should happen before other stuff but after perf */ |
67 | CPU_PRI_PERF = 20, | |
68 | CPU_PRI_MIGRATION = 10, | |
db7bccf4 TH |
69 | /* prepare workqueues for other notifiers */ |
70 | CPU_PRI_WORKQUEUE = 5, | |
50a323b7 TH |
71 | }; |
72 | ||
1da177e4 LT |
73 | #ifdef CONFIG_SMP |
74 | /* Need to know about CPUs going up/down? */ | |
799e64f0 PM |
75 | #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) |
76 | #define cpu_notifier(fn, pri) { \ | |
77 | static struct notifier_block fn##_nb __cpuinitdata = \ | |
78 | { .notifier_call = fn, .priority = pri }; \ | |
79 | register_cpu_notifier(&fn##_nb); \ | |
80 | } | |
81 | #else /* #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */ | |
82 | #define cpu_notifier(fn, pri) do { (void)(fn); } while (0) | |
83 | #endif /* #else #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */ | |
65edc68c | 84 | #ifdef CONFIG_HOTPLUG_CPU |
47e627bc | 85 | extern int register_cpu_notifier(struct notifier_block *nb); |
1da177e4 | 86 | extern void unregister_cpu_notifier(struct notifier_block *nb); |
65edc68c | 87 | #else |
47e627bc AK |
88 | |
89 | #ifndef MODULE | |
90 | extern int register_cpu_notifier(struct notifier_block *nb); | |
91 | #else | |
92 | static inline int register_cpu_notifier(struct notifier_block *nb) | |
93 | { | |
94 | return 0; | |
95 | } | |
96 | #endif | |
97 | ||
65edc68c CS |
98 | static inline void unregister_cpu_notifier(struct notifier_block *nb) |
99 | { | |
100 | } | |
101 | #endif | |
1da177e4 LT |
102 | |
103 | int cpu_up(unsigned int cpu); | |
e545a614 | 104 | void notify_cpu_starting(unsigned int cpu); |
3da1c84c ON |
105 | extern void cpu_maps_update_begin(void); |
106 | extern void cpu_maps_update_done(void); | |
d0d23b54 | 107 | |
3da1c84c | 108 | #else /* CONFIG_SMP */ |
1da177e4 | 109 | |
799e64f0 PM |
110 | #define cpu_notifier(fn, pri) do { (void)(fn); } while (0) |
111 | ||
1da177e4 LT |
112 | static inline int register_cpu_notifier(struct notifier_block *nb) |
113 | { | |
114 | return 0; | |
115 | } | |
d0d23b54 | 116 | |
1da177e4 LT |
117 | static inline void unregister_cpu_notifier(struct notifier_block *nb) |
118 | { | |
119 | } | |
120 | ||
3da1c84c ON |
121 | static inline void cpu_maps_update_begin(void) |
122 | { | |
123 | } | |
124 | ||
125 | static inline void cpu_maps_update_done(void) | |
126 | { | |
127 | } | |
128 | ||
1da177e4 LT |
129 | #endif /* CONFIG_SMP */ |
130 | extern struct sysdev_class cpu_sysdev_class; | |
131 | ||
132 | #ifdef CONFIG_HOTPLUG_CPU | |
133 | /* Stop CPUs going up and down. */ | |
f7dff2b1 | 134 | |
86ef5c9a GS |
135 | extern void get_online_cpus(void); |
136 | extern void put_online_cpus(void); | |
799e64f0 | 137 | #define hotcpu_notifier(fn, pri) cpu_notifier(fn, pri) |
39f4885c CS |
138 | #define register_hotcpu_notifier(nb) register_cpu_notifier(nb) |
139 | #define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb) | |
1da177e4 | 140 | int cpu_down(unsigned int cpu); |
f7dff2b1 | 141 | |
51badebd GS |
142 | #ifdef CONFIG_ARCH_CPU_PROBE_RELEASE |
143 | extern void cpu_hotplug_driver_lock(void); | |
144 | extern void cpu_hotplug_driver_unlock(void); | |
145 | #else | |
146 | static inline void cpu_hotplug_driver_lock(void) | |
147 | { | |
148 | } | |
149 | ||
150 | static inline void cpu_hotplug_driver_unlock(void) | |
151 | { | |
152 | } | |
153 | #endif | |
154 | ||
f7dff2b1 GS |
155 | #else /* CONFIG_HOTPLUG_CPU */ |
156 | ||
86ef5c9a GS |
157 | #define get_online_cpus() do { } while (0) |
158 | #define put_online_cpus() do { } while (0) | |
02316067 | 159 | #define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0) |
761bb431 SS |
160 | /* These aren't inline functions due to a GCC bug. */ |
161 | #define register_hotcpu_notifier(nb) ({ (void)(nb); 0; }) | |
162 | #define unregister_hotcpu_notifier(nb) ({ (void)(nb); }) | |
f7dff2b1 | 163 | #endif /* CONFIG_HOTPLUG_CPU */ |
1da177e4 | 164 | |
f3de4be9 | 165 | #ifdef CONFIG_PM_SLEEP_SMP |
1d64b9cb RW |
166 | extern int suspend_cpu_hotplug; |
167 | ||
e3920fb4 RW |
168 | extern int disable_nonboot_cpus(void); |
169 | extern void enable_nonboot_cpus(void); | |
f3de4be9 | 170 | #else /* !CONFIG_PM_SLEEP_SMP */ |
1d64b9cb RW |
171 | #define suspend_cpu_hotplug 0 |
172 | ||
e3920fb4 RW |
173 | static inline int disable_nonboot_cpus(void) { return 0; } |
174 | static inline void enable_nonboot_cpus(void) {} | |
f3de4be9 | 175 | #endif /* !CONFIG_PM_SLEEP_SMP */ |
e3920fb4 | 176 | |
1da177e4 | 177 | #endif /* _LINUX_CPU_H_ */ |