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 | ||
8a25a2fd | 17 | #include <linux/device.h> |
1da177e4 LT |
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 */ |
8a25a2fd | 25 | struct device dev; |
1da177e4 LT |
26 | }; |
27 | ||
76b67ed9 | 28 | extern int register_cpu(struct cpu *cpu, int num); |
8a25a2fd | 29 | extern struct device *get_cpu_device(unsigned cpu); |
2987557f | 30 | extern bool cpu_is_hotpluggable(unsigned cpu); |
0344c6c5 | 31 | |
8a25a2fd KS |
32 | extern int cpu_add_dev_attr(struct device_attribute *attr); |
33 | extern void cpu_remove_dev_attr(struct device_attribute *attr); | |
0344c6c5 | 34 | |
8a25a2fd KS |
35 | extern int cpu_add_dev_attr_group(struct attribute_group *attrs); |
36 | extern void cpu_remove_dev_attr_group(struct attribute_group *attrs); | |
0344c6c5 | 37 | |
8a25a2fd | 38 | extern int sched_create_sysfs_power_savings_entries(struct device *dev); |
0344c6c5 | 39 | |
1da177e4 | 40 | #ifdef CONFIG_HOTPLUG_CPU |
76b67ed9 | 41 | extern void unregister_cpu(struct cpu *cpu); |
12633e80 NF |
42 | extern ssize_t arch_cpu_probe(const char *, size_t); |
43 | extern ssize_t arch_cpu_release(const char *, size_t); | |
1da177e4 LT |
44 | #endif |
45 | struct notifier_block; | |
46 | ||
50a323b7 TH |
47 | /* |
48 | * CPU notifier priorities. | |
49 | */ | |
50 | enum { | |
3a101d05 TH |
51 | /* |
52 | * SCHED_ACTIVE marks a cpu which is coming up active during | |
53 | * CPU_ONLINE and CPU_DOWN_FAILED and must be the first | |
54 | * notifier. CPUSET_ACTIVE adjusts cpuset according to | |
55 | * cpu_active mask right after SCHED_ACTIVE. During | |
56 | * CPU_DOWN_PREPARE, SCHED_INACTIVE and CPUSET_INACTIVE are | |
57 | * ordered in the similar way. | |
58 | * | |
59 | * This ordering guarantees consistent cpu_active mask and | |
60 | * migration behavior to all cpu notifiers. | |
61 | */ | |
62 | CPU_PRI_SCHED_ACTIVE = INT_MAX, | |
63 | CPU_PRI_CPUSET_ACTIVE = INT_MAX - 1, | |
64 | CPU_PRI_SCHED_INACTIVE = INT_MIN + 1, | |
65 | CPU_PRI_CPUSET_INACTIVE = INT_MIN, | |
66 | ||
50a323b7 TH |
67 | /* migration should happen before other stuff but after perf */ |
68 | CPU_PRI_PERF = 20, | |
69 | CPU_PRI_MIGRATION = 10, | |
db7bccf4 TH |
70 | /* prepare workqueues for other notifiers */ |
71 | CPU_PRI_WORKQUEUE = 5, | |
50a323b7 TH |
72 | }; |
73 | ||
80f1ff97 AW |
74 | #define CPU_ONLINE 0x0002 /* CPU (unsigned)v is up */ |
75 | #define CPU_UP_PREPARE 0x0003 /* CPU (unsigned)v coming up */ | |
76 | #define CPU_UP_CANCELED 0x0004 /* CPU (unsigned)v NOT coming up */ | |
77 | #define CPU_DOWN_PREPARE 0x0005 /* CPU (unsigned)v going down */ | |
78 | #define CPU_DOWN_FAILED 0x0006 /* CPU (unsigned)v NOT going down */ | |
79 | #define CPU_DEAD 0x0007 /* CPU (unsigned)v dead */ | |
80 | #define CPU_DYING 0x0008 /* CPU (unsigned)v not running any task, | |
81 | * not handling interrupts, soon dead. | |
82 | * Called on the dying cpu, interrupts | |
83 | * are already disabled. Must not | |
84 | * sleep, must not fail */ | |
85 | #define CPU_POST_DEAD 0x0009 /* CPU (unsigned)v dead, cpu_hotplug | |
86 | * lock is dropped */ | |
87 | #define CPU_STARTING 0x000A /* CPU (unsigned)v soon running. | |
88 | * Called on the new cpu, just before | |
89 | * enabling interrupts. Must not sleep, | |
90 | * must not fail */ | |
91 | ||
92 | /* Used for CPU hotplug events occurring while tasks are frozen due to a suspend | |
93 | * operation in progress | |
94 | */ | |
95 | #define CPU_TASKS_FROZEN 0x0010 | |
96 | ||
97 | #define CPU_ONLINE_FROZEN (CPU_ONLINE | CPU_TASKS_FROZEN) | |
98 | #define CPU_UP_PREPARE_FROZEN (CPU_UP_PREPARE | CPU_TASKS_FROZEN) | |
99 | #define CPU_UP_CANCELED_FROZEN (CPU_UP_CANCELED | CPU_TASKS_FROZEN) | |
100 | #define CPU_DOWN_PREPARE_FROZEN (CPU_DOWN_PREPARE | CPU_TASKS_FROZEN) | |
101 | #define CPU_DOWN_FAILED_FROZEN (CPU_DOWN_FAILED | CPU_TASKS_FROZEN) | |
102 | #define CPU_DEAD_FROZEN (CPU_DEAD | CPU_TASKS_FROZEN) | |
103 | #define CPU_DYING_FROZEN (CPU_DYING | CPU_TASKS_FROZEN) | |
104 | #define CPU_STARTING_FROZEN (CPU_STARTING | CPU_TASKS_FROZEN) | |
105 | ||
106 | ||
1da177e4 LT |
107 | #ifdef CONFIG_SMP |
108 | /* Need to know about CPUs going up/down? */ | |
799e64f0 PM |
109 | #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) |
110 | #define cpu_notifier(fn, pri) { \ | |
111 | static struct notifier_block fn##_nb __cpuinitdata = \ | |
112 | { .notifier_call = fn, .priority = pri }; \ | |
113 | register_cpu_notifier(&fn##_nb); \ | |
114 | } | |
115 | #else /* #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */ | |
116 | #define cpu_notifier(fn, pri) do { (void)(fn); } while (0) | |
117 | #endif /* #else #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */ | |
65edc68c | 118 | #ifdef CONFIG_HOTPLUG_CPU |
47e627bc | 119 | extern int register_cpu_notifier(struct notifier_block *nb); |
1da177e4 | 120 | extern void unregister_cpu_notifier(struct notifier_block *nb); |
65edc68c | 121 | #else |
47e627bc AK |
122 | |
123 | #ifndef MODULE | |
124 | extern int register_cpu_notifier(struct notifier_block *nb); | |
125 | #else | |
126 | static inline int register_cpu_notifier(struct notifier_block *nb) | |
127 | { | |
128 | return 0; | |
129 | } | |
130 | #endif | |
131 | ||
65edc68c CS |
132 | static inline void unregister_cpu_notifier(struct notifier_block *nb) |
133 | { | |
134 | } | |
135 | #endif | |
1da177e4 LT |
136 | |
137 | int cpu_up(unsigned int cpu); | |
e545a614 | 138 | void notify_cpu_starting(unsigned int cpu); |
3da1c84c ON |
139 | extern void cpu_maps_update_begin(void); |
140 | extern void cpu_maps_update_done(void); | |
d0d23b54 | 141 | |
3da1c84c | 142 | #else /* CONFIG_SMP */ |
1da177e4 | 143 | |
799e64f0 PM |
144 | #define cpu_notifier(fn, pri) do { (void)(fn); } while (0) |
145 | ||
1da177e4 LT |
146 | static inline int register_cpu_notifier(struct notifier_block *nb) |
147 | { | |
148 | return 0; | |
149 | } | |
d0d23b54 | 150 | |
1da177e4 LT |
151 | static inline void unregister_cpu_notifier(struct notifier_block *nb) |
152 | { | |
153 | } | |
154 | ||
3da1c84c ON |
155 | static inline void cpu_maps_update_begin(void) |
156 | { | |
157 | } | |
158 | ||
159 | static inline void cpu_maps_update_done(void) | |
160 | { | |
161 | } | |
162 | ||
1da177e4 | 163 | #endif /* CONFIG_SMP */ |
8a25a2fd | 164 | extern struct bus_type cpu_subsys; |
1da177e4 LT |
165 | |
166 | #ifdef CONFIG_HOTPLUG_CPU | |
167 | /* Stop CPUs going up and down. */ | |
f7dff2b1 | 168 | |
86ef5c9a GS |
169 | extern void get_online_cpus(void); |
170 | extern void put_online_cpus(void); | |
799e64f0 | 171 | #define hotcpu_notifier(fn, pri) cpu_notifier(fn, pri) |
39f4885c CS |
172 | #define register_hotcpu_notifier(nb) register_cpu_notifier(nb) |
173 | #define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb) | |
1da177e4 | 174 | int cpu_down(unsigned int cpu); |
f7dff2b1 | 175 | |
51badebd GS |
176 | #ifdef CONFIG_ARCH_CPU_PROBE_RELEASE |
177 | extern void cpu_hotplug_driver_lock(void); | |
178 | extern void cpu_hotplug_driver_unlock(void); | |
179 | #else | |
180 | static inline void cpu_hotplug_driver_lock(void) | |
181 | { | |
182 | } | |
183 | ||
184 | static inline void cpu_hotplug_driver_unlock(void) | |
185 | { | |
186 | } | |
187 | #endif | |
188 | ||
f7dff2b1 GS |
189 | #else /* CONFIG_HOTPLUG_CPU */ |
190 | ||
86ef5c9a GS |
191 | #define get_online_cpus() do { } while (0) |
192 | #define put_online_cpus() do { } while (0) | |
02316067 | 193 | #define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0) |
761bb431 SS |
194 | /* These aren't inline functions due to a GCC bug. */ |
195 | #define register_hotcpu_notifier(nb) ({ (void)(nb); 0; }) | |
196 | #define unregister_hotcpu_notifier(nb) ({ (void)(nb); }) | |
f7dff2b1 | 197 | #endif /* CONFIG_HOTPLUG_CPU */ |
1da177e4 | 198 | |
f3de4be9 | 199 | #ifdef CONFIG_PM_SLEEP_SMP |
e3920fb4 RW |
200 | extern int disable_nonboot_cpus(void); |
201 | extern void enable_nonboot_cpus(void); | |
f3de4be9 | 202 | #else /* !CONFIG_PM_SLEEP_SMP */ |
e3920fb4 RW |
203 | static inline int disable_nonboot_cpus(void) { return 0; } |
204 | static inline void enable_nonboot_cpus(void) {} | |
f3de4be9 | 205 | #endif /* !CONFIG_PM_SLEEP_SMP */ |
e3920fb4 | 206 | |
1da177e4 | 207 | #endif /* _LINUX_CPU_H_ */ |