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 | |
1da177e4 | 9 | * |
611a75e1 | 10 | * CPUs are exported via sysfs in the devices/system/cpu |
1da177e4 | 11 | * directory. |
1da177e4 LT |
12 | */ |
13 | #ifndef _LINUX_CPU_H_ | |
14 | #define _LINUX_CPU_H_ | |
15 | ||
1da177e4 LT |
16 | #include <linux/node.h> |
17 | #include <linux/compiler.h> | |
18 | #include <linux/cpumask.h> | |
1da177e4 | 19 | |
313162d0 | 20 | struct device; |
d1cb9d1a | 21 | struct device_node; |
313162d0 | 22 | |
1da177e4 LT |
23 | struct cpu { |
24 | int node_id; /* The node which contains the CPU */ | |
72486f1f | 25 | int hotpluggable; /* creates sysfs control file if hotpluggable */ |
8a25a2fd | 26 | struct device dev; |
1da177e4 LT |
27 | }; |
28 | ||
76b67ed9 | 29 | extern int register_cpu(struct cpu *cpu, int num); |
8a25a2fd | 30 | extern struct device *get_cpu_device(unsigned cpu); |
2987557f | 31 | extern bool cpu_is_hotpluggable(unsigned cpu); |
183912d3 | 32 | extern bool arch_match_cpu_phys_id(int cpu, u64 phys_id); |
d1cb9d1a DM |
33 | extern bool arch_find_n_match_cpu_physical_id(struct device_node *cpun, |
34 | int cpu, unsigned int *thread); | |
0344c6c5 | 35 | |
8a25a2fd KS |
36 | extern int cpu_add_dev_attr(struct device_attribute *attr); |
37 | extern void cpu_remove_dev_attr(struct device_attribute *attr); | |
0344c6c5 | 38 | |
8a25a2fd KS |
39 | extern int cpu_add_dev_attr_group(struct attribute_group *attrs); |
40 | extern void cpu_remove_dev_attr_group(struct attribute_group *attrs); | |
0344c6c5 | 41 | |
1da177e4 | 42 | #ifdef CONFIG_HOTPLUG_CPU |
76b67ed9 | 43 | extern void unregister_cpu(struct cpu *cpu); |
12633e80 NF |
44 | extern ssize_t arch_cpu_probe(const char *, size_t); |
45 | extern ssize_t arch_cpu_release(const char *, size_t); | |
1da177e4 LT |
46 | #endif |
47 | struct notifier_block; | |
48 | ||
fad12ac8 TR |
49 | #ifdef CONFIG_ARCH_HAS_CPU_AUTOPROBE |
50 | extern int arch_cpu_uevent(struct device *dev, struct kobj_uevent_env *env); | |
51 | extern ssize_t arch_print_cpu_modalias(struct device *dev, | |
52 | struct device_attribute *attr, | |
53 | char *bufptr); | |
54 | #endif | |
55 | ||
50a323b7 TH |
56 | /* |
57 | * CPU notifier priorities. | |
58 | */ | |
59 | enum { | |
3a101d05 TH |
60 | /* |
61 | * SCHED_ACTIVE marks a cpu which is coming up active during | |
62 | * CPU_ONLINE and CPU_DOWN_FAILED and must be the first | |
63 | * notifier. CPUSET_ACTIVE adjusts cpuset according to | |
64 | * cpu_active mask right after SCHED_ACTIVE. During | |
65 | * CPU_DOWN_PREPARE, SCHED_INACTIVE and CPUSET_INACTIVE are | |
66 | * ordered in the similar way. | |
67 | * | |
68 | * This ordering guarantees consistent cpu_active mask and | |
69 | * migration behavior to all cpu notifiers. | |
70 | */ | |
71 | CPU_PRI_SCHED_ACTIVE = INT_MAX, | |
72 | CPU_PRI_CPUSET_ACTIVE = INT_MAX - 1, | |
73 | CPU_PRI_SCHED_INACTIVE = INT_MIN + 1, | |
74 | CPU_PRI_CPUSET_INACTIVE = INT_MIN, | |
75 | ||
50a323b7 TH |
76 | /* migration should happen before other stuff but after perf */ |
77 | CPU_PRI_PERF = 20, | |
78 | CPU_PRI_MIGRATION = 10, | |
65758202 TH |
79 | /* bring up workqueues before normal notifiers and down after */ |
80 | CPU_PRI_WORKQUEUE_UP = 5, | |
81 | CPU_PRI_WORKQUEUE_DOWN = -5, | |
50a323b7 TH |
82 | }; |
83 | ||
80f1ff97 AW |
84 | #define CPU_ONLINE 0x0002 /* CPU (unsigned)v is up */ |
85 | #define CPU_UP_PREPARE 0x0003 /* CPU (unsigned)v coming up */ | |
86 | #define CPU_UP_CANCELED 0x0004 /* CPU (unsigned)v NOT coming up */ | |
87 | #define CPU_DOWN_PREPARE 0x0005 /* CPU (unsigned)v going down */ | |
88 | #define CPU_DOWN_FAILED 0x0006 /* CPU (unsigned)v NOT going down */ | |
89 | #define CPU_DEAD 0x0007 /* CPU (unsigned)v dead */ | |
90 | #define CPU_DYING 0x0008 /* CPU (unsigned)v not running any task, | |
91 | * not handling interrupts, soon dead. | |
92 | * Called on the dying cpu, interrupts | |
93 | * are already disabled. Must not | |
94 | * sleep, must not fail */ | |
95 | #define CPU_POST_DEAD 0x0009 /* CPU (unsigned)v dead, cpu_hotplug | |
96 | * lock is dropped */ | |
97 | #define CPU_STARTING 0x000A /* CPU (unsigned)v soon running. | |
98 | * Called on the new cpu, just before | |
99 | * enabling interrupts. Must not sleep, | |
100 | * must not fail */ | |
101 | ||
102 | /* Used for CPU hotplug events occurring while tasks are frozen due to a suspend | |
103 | * operation in progress | |
104 | */ | |
105 | #define CPU_TASKS_FROZEN 0x0010 | |
106 | ||
107 | #define CPU_ONLINE_FROZEN (CPU_ONLINE | CPU_TASKS_FROZEN) | |
108 | #define CPU_UP_PREPARE_FROZEN (CPU_UP_PREPARE | CPU_TASKS_FROZEN) | |
109 | #define CPU_UP_CANCELED_FROZEN (CPU_UP_CANCELED | CPU_TASKS_FROZEN) | |
110 | #define CPU_DOWN_PREPARE_FROZEN (CPU_DOWN_PREPARE | CPU_TASKS_FROZEN) | |
111 | #define CPU_DOWN_FAILED_FROZEN (CPU_DOWN_FAILED | CPU_TASKS_FROZEN) | |
112 | #define CPU_DEAD_FROZEN (CPU_DEAD | CPU_TASKS_FROZEN) | |
113 | #define CPU_DYING_FROZEN (CPU_DYING | CPU_TASKS_FROZEN) | |
114 | #define CPU_STARTING_FROZEN (CPU_STARTING | CPU_TASKS_FROZEN) | |
115 | ||
116 | ||
1da177e4 LT |
117 | #ifdef CONFIG_SMP |
118 | /* Need to know about CPUs going up/down? */ | |
799e64f0 PM |
119 | #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) |
120 | #define cpu_notifier(fn, pri) { \ | |
0db0628d | 121 | static struct notifier_block fn##_nb = \ |
799e64f0 PM |
122 | { .notifier_call = fn, .priority = pri }; \ |
123 | register_cpu_notifier(&fn##_nb); \ | |
124 | } | |
125 | #else /* #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */ | |
126 | #define cpu_notifier(fn, pri) do { (void)(fn); } while (0) | |
127 | #endif /* #else #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */ | |
65edc68c | 128 | #ifdef CONFIG_HOTPLUG_CPU |
47e627bc | 129 | extern int register_cpu_notifier(struct notifier_block *nb); |
1da177e4 | 130 | extern void unregister_cpu_notifier(struct notifier_block *nb); |
65edc68c | 131 | #else |
47e627bc AK |
132 | |
133 | #ifndef MODULE | |
134 | extern int register_cpu_notifier(struct notifier_block *nb); | |
135 | #else | |
136 | static inline int register_cpu_notifier(struct notifier_block *nb) | |
137 | { | |
138 | return 0; | |
139 | } | |
140 | #endif | |
141 | ||
65edc68c CS |
142 | static inline void unregister_cpu_notifier(struct notifier_block *nb) |
143 | { | |
144 | } | |
145 | #endif | |
1da177e4 LT |
146 | |
147 | int cpu_up(unsigned int cpu); | |
e545a614 | 148 | void notify_cpu_starting(unsigned int cpu); |
3da1c84c ON |
149 | extern void cpu_maps_update_begin(void); |
150 | extern void cpu_maps_update_done(void); | |
d0d23b54 | 151 | |
3da1c84c | 152 | #else /* CONFIG_SMP */ |
1da177e4 | 153 | |
799e64f0 PM |
154 | #define cpu_notifier(fn, pri) do { (void)(fn); } while (0) |
155 | ||
1da177e4 LT |
156 | static inline int register_cpu_notifier(struct notifier_block *nb) |
157 | { | |
158 | return 0; | |
159 | } | |
d0d23b54 | 160 | |
1da177e4 LT |
161 | static inline void unregister_cpu_notifier(struct notifier_block *nb) |
162 | { | |
163 | } | |
164 | ||
3da1c84c ON |
165 | static inline void cpu_maps_update_begin(void) |
166 | { | |
167 | } | |
168 | ||
169 | static inline void cpu_maps_update_done(void) | |
170 | { | |
171 | } | |
172 | ||
1da177e4 | 173 | #endif /* CONFIG_SMP */ |
8a25a2fd | 174 | extern struct bus_type cpu_subsys; |
1da177e4 LT |
175 | |
176 | #ifdef CONFIG_HOTPLUG_CPU | |
177 | /* Stop CPUs going up and down. */ | |
f7dff2b1 | 178 | |
b9d10be7 TK |
179 | extern void cpu_hotplug_begin(void); |
180 | extern void cpu_hotplug_done(void); | |
86ef5c9a GS |
181 | extern void get_online_cpus(void); |
182 | extern void put_online_cpus(void); | |
16e53dbf SB |
183 | extern void cpu_hotplug_disable(void); |
184 | extern void cpu_hotplug_enable(void); | |
799e64f0 | 185 | #define hotcpu_notifier(fn, pri) cpu_notifier(fn, pri) |
39f4885c CS |
186 | #define register_hotcpu_notifier(nb) register_cpu_notifier(nb) |
187 | #define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb) | |
cb79295e | 188 | void clear_tasks_mm_cpumask(int cpu); |
1da177e4 | 189 | int cpu_down(unsigned int cpu); |
f7dff2b1 GS |
190 | |
191 | #else /* CONFIG_HOTPLUG_CPU */ | |
192 | ||
b9d10be7 TK |
193 | static inline void cpu_hotplug_begin(void) {} |
194 | static inline void cpu_hotplug_done(void) {} | |
86ef5c9a GS |
195 | #define get_online_cpus() do { } while (0) |
196 | #define put_online_cpus() do { } while (0) | |
16e53dbf SB |
197 | #define cpu_hotplug_disable() do { } while (0) |
198 | #define cpu_hotplug_enable() do { } while (0) | |
02316067 | 199 | #define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0) |
761bb431 SS |
200 | /* These aren't inline functions due to a GCC bug. */ |
201 | #define register_hotcpu_notifier(nb) ({ (void)(nb); 0; }) | |
202 | #define unregister_hotcpu_notifier(nb) ({ (void)(nb); }) | |
f7dff2b1 | 203 | #endif /* CONFIG_HOTPLUG_CPU */ |
1da177e4 | 204 | |
f3de4be9 | 205 | #ifdef CONFIG_PM_SLEEP_SMP |
e3920fb4 RW |
206 | extern int disable_nonboot_cpus(void); |
207 | extern void enable_nonboot_cpus(void); | |
f3de4be9 | 208 | #else /* !CONFIG_PM_SLEEP_SMP */ |
e3920fb4 RW |
209 | static inline int disable_nonboot_cpus(void) { return 0; } |
210 | static inline void enable_nonboot_cpus(void) {} | |
f3de4be9 | 211 | #endif /* !CONFIG_PM_SLEEP_SMP */ |
e3920fb4 | 212 | |
a1a04ec3 TG |
213 | enum cpuhp_state { |
214 | CPUHP_OFFLINE, | |
215 | CPUHP_ONLINE, | |
216 | }; | |
217 | ||
218 | void cpu_startup_entry(enum cpuhp_state state); | |
219 | void cpu_idle(void); | |
220 | ||
d1669912 TG |
221 | void cpu_idle_poll_ctrl(bool enable); |
222 | ||
223 | void arch_cpu_idle(void); | |
224 | void arch_cpu_idle_prepare(void); | |
225 | void arch_cpu_idle_enter(void); | |
226 | void arch_cpu_idle_exit(void); | |
227 | void arch_cpu_idle_dead(void); | |
228 | ||
1da177e4 | 229 | #endif /* _LINUX_CPU_H_ */ |