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> | |
cff7d378 | 19 | #include <linux/cpuhotplug.h> |
1da177e4 | 20 | |
313162d0 | 21 | struct device; |
d1cb9d1a | 22 | struct device_node; |
3d52943b | 23 | struct attribute_group; |
313162d0 | 24 | |
1da177e4 LT |
25 | struct cpu { |
26 | int node_id; /* The node which contains the CPU */ | |
72486f1f | 27 | int hotpluggable; /* creates sysfs control file if hotpluggable */ |
8a25a2fd | 28 | struct device dev; |
1da177e4 LT |
29 | }; |
30 | ||
cff7d378 TG |
31 | extern void boot_cpu_init(void); |
32 | extern void boot_cpu_state_init(void); | |
33 | ||
76b67ed9 | 34 | extern int register_cpu(struct cpu *cpu, int num); |
8a25a2fd | 35 | extern struct device *get_cpu_device(unsigned cpu); |
2987557f | 36 | extern bool cpu_is_hotpluggable(unsigned cpu); |
183912d3 | 37 | extern bool arch_match_cpu_phys_id(int cpu, u64 phys_id); |
d1cb9d1a DM |
38 | extern bool arch_find_n_match_cpu_physical_id(struct device_node *cpun, |
39 | int cpu, unsigned int *thread); | |
0344c6c5 | 40 | |
8a25a2fd KS |
41 | extern int cpu_add_dev_attr(struct device_attribute *attr); |
42 | extern void cpu_remove_dev_attr(struct device_attribute *attr); | |
0344c6c5 | 43 | |
8a25a2fd KS |
44 | extern int cpu_add_dev_attr_group(struct attribute_group *attrs); |
45 | extern void cpu_remove_dev_attr_group(struct attribute_group *attrs); | |
0344c6c5 | 46 | |
8db14860 NI |
47 | extern __printf(4, 5) |
48 | struct device *cpu_device_create(struct device *parent, void *drvdata, | |
49 | const struct attribute_group **groups, | |
50 | const char *fmt, ...); | |
1da177e4 | 51 | #ifdef CONFIG_HOTPLUG_CPU |
76b67ed9 | 52 | extern void unregister_cpu(struct cpu *cpu); |
12633e80 NF |
53 | extern ssize_t arch_cpu_probe(const char *, size_t); |
54 | extern ssize_t arch_cpu_release(const char *, size_t); | |
1da177e4 LT |
55 | #endif |
56 | struct notifier_block; | |
57 | ||
80f1ff97 AW |
58 | #define CPU_ONLINE 0x0002 /* CPU (unsigned)v is up */ |
59 | #define CPU_UP_PREPARE 0x0003 /* CPU (unsigned)v coming up */ | |
60 | #define CPU_UP_CANCELED 0x0004 /* CPU (unsigned)v NOT coming up */ | |
61 | #define CPU_DOWN_PREPARE 0x0005 /* CPU (unsigned)v going down */ | |
62 | #define CPU_DOWN_FAILED 0x0006 /* CPU (unsigned)v NOT going down */ | |
63 | #define CPU_DEAD 0x0007 /* CPU (unsigned)v dead */ | |
64 | #define CPU_DYING 0x0008 /* CPU (unsigned)v not running any task, | |
65 | * not handling interrupts, soon dead. | |
66 | * Called on the dying cpu, interrupts | |
67 | * are already disabled. Must not | |
68 | * sleep, must not fail */ | |
69 | #define CPU_POST_DEAD 0x0009 /* CPU (unsigned)v dead, cpu_hotplug | |
70 | * lock is dropped */ | |
71 | #define CPU_STARTING 0x000A /* CPU (unsigned)v soon running. | |
72 | * Called on the new cpu, just before | |
73 | * enabling interrupts. Must not sleep, | |
74 | * must not fail */ | |
27d50c7e | 75 | #define CPU_BROKEN 0x000B /* CPU (unsigned)v did not die properly, |
8038dad7 | 76 | * perhaps due to preemption. */ |
80f1ff97 AW |
77 | |
78 | /* Used for CPU hotplug events occurring while tasks are frozen due to a suspend | |
79 | * operation in progress | |
80 | */ | |
81 | #define CPU_TASKS_FROZEN 0x0010 | |
82 | ||
83 | #define CPU_ONLINE_FROZEN (CPU_ONLINE | CPU_TASKS_FROZEN) | |
84 | #define CPU_UP_PREPARE_FROZEN (CPU_UP_PREPARE | CPU_TASKS_FROZEN) | |
85 | #define CPU_UP_CANCELED_FROZEN (CPU_UP_CANCELED | CPU_TASKS_FROZEN) | |
86 | #define CPU_DOWN_PREPARE_FROZEN (CPU_DOWN_PREPARE | CPU_TASKS_FROZEN) | |
87 | #define CPU_DOWN_FAILED_FROZEN (CPU_DOWN_FAILED | CPU_TASKS_FROZEN) | |
88 | #define CPU_DEAD_FROZEN (CPU_DEAD | CPU_TASKS_FROZEN) | |
89 | #define CPU_DYING_FROZEN (CPU_DYING | CPU_TASKS_FROZEN) | |
90 | #define CPU_STARTING_FROZEN (CPU_STARTING | CPU_TASKS_FROZEN) | |
91 | ||
92 | ||
1da177e4 | 93 | #ifdef CONFIG_SMP |
090e77c3 | 94 | extern bool cpuhp_tasks_frozen; |
1da177e4 | 95 | /* Need to know about CPUs going up/down? */ |
799e64f0 PM |
96 | #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) |
97 | #define cpu_notifier(fn, pri) { \ | |
0db0628d | 98 | static struct notifier_block fn##_nb = \ |
799e64f0 PM |
99 | { .notifier_call = fn, .priority = pri }; \ |
100 | register_cpu_notifier(&fn##_nb); \ | |
101 | } | |
93ae4f97 SB |
102 | |
103 | #define __cpu_notifier(fn, pri) { \ | |
104 | static struct notifier_block fn##_nb = \ | |
105 | { .notifier_call = fn, .priority = pri }; \ | |
106 | __register_cpu_notifier(&fn##_nb); \ | |
107 | } | |
799e64f0 PM |
108 | #else /* #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */ |
109 | #define cpu_notifier(fn, pri) do { (void)(fn); } while (0) | |
93ae4f97 | 110 | #define __cpu_notifier(fn, pri) do { (void)(fn); } while (0) |
799e64f0 | 111 | #endif /* #else #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */ |
93ae4f97 | 112 | |
65edc68c | 113 | #ifdef CONFIG_HOTPLUG_CPU |
47e627bc | 114 | extern int register_cpu_notifier(struct notifier_block *nb); |
93ae4f97 | 115 | extern int __register_cpu_notifier(struct notifier_block *nb); |
1da177e4 | 116 | extern void unregister_cpu_notifier(struct notifier_block *nb); |
93ae4f97 | 117 | extern void __unregister_cpu_notifier(struct notifier_block *nb); |
65edc68c | 118 | #else |
47e627bc AK |
119 | |
120 | #ifndef MODULE | |
121 | extern int register_cpu_notifier(struct notifier_block *nb); | |
93ae4f97 | 122 | extern int __register_cpu_notifier(struct notifier_block *nb); |
47e627bc AK |
123 | #else |
124 | static inline int register_cpu_notifier(struct notifier_block *nb) | |
125 | { | |
126 | return 0; | |
127 | } | |
93ae4f97 SB |
128 | |
129 | static inline int __register_cpu_notifier(struct notifier_block *nb) | |
130 | { | |
131 | return 0; | |
132 | } | |
47e627bc AK |
133 | #endif |
134 | ||
65edc68c CS |
135 | static inline void unregister_cpu_notifier(struct notifier_block *nb) |
136 | { | |
137 | } | |
93ae4f97 SB |
138 | |
139 | static inline void __unregister_cpu_notifier(struct notifier_block *nb) | |
140 | { | |
141 | } | |
65edc68c | 142 | #endif |
1da177e4 LT |
143 | |
144 | int cpu_up(unsigned int cpu); | |
e545a614 | 145 | void notify_cpu_starting(unsigned int cpu); |
3da1c84c ON |
146 | extern void cpu_maps_update_begin(void); |
147 | extern void cpu_maps_update_done(void); | |
d0d23b54 | 148 | |
93ae4f97 SB |
149 | #define cpu_notifier_register_begin cpu_maps_update_begin |
150 | #define cpu_notifier_register_done cpu_maps_update_done | |
151 | ||
3da1c84c | 152 | #else /* CONFIG_SMP */ |
090e77c3 | 153 | #define cpuhp_tasks_frozen 0 |
1da177e4 | 154 | |
799e64f0 | 155 | #define cpu_notifier(fn, pri) do { (void)(fn); } while (0) |
93ae4f97 | 156 | #define __cpu_notifier(fn, pri) do { (void)(fn); } while (0) |
799e64f0 | 157 | |
1da177e4 LT |
158 | static inline int register_cpu_notifier(struct notifier_block *nb) |
159 | { | |
160 | return 0; | |
161 | } | |
d0d23b54 | 162 | |
93ae4f97 SB |
163 | static inline int __register_cpu_notifier(struct notifier_block *nb) |
164 | { | |
165 | return 0; | |
166 | } | |
167 | ||
1da177e4 LT |
168 | static inline void unregister_cpu_notifier(struct notifier_block *nb) |
169 | { | |
170 | } | |
171 | ||
93ae4f97 SB |
172 | static inline void __unregister_cpu_notifier(struct notifier_block *nb) |
173 | { | |
174 | } | |
175 | ||
3da1c84c ON |
176 | static inline void cpu_maps_update_begin(void) |
177 | { | |
178 | } | |
179 | ||
180 | static inline void cpu_maps_update_done(void) | |
181 | { | |
182 | } | |
183 | ||
93ae4f97 SB |
184 | static inline void cpu_notifier_register_begin(void) |
185 | { | |
186 | } | |
187 | ||
188 | static inline void cpu_notifier_register_done(void) | |
189 | { | |
190 | } | |
191 | ||
1da177e4 | 192 | #endif /* CONFIG_SMP */ |
8a25a2fd | 193 | extern struct bus_type cpu_subsys; |
1da177e4 LT |
194 | |
195 | #ifdef CONFIG_HOTPLUG_CPU | |
196 | /* Stop CPUs going up and down. */ | |
f7dff2b1 | 197 | |
b9d10be7 TK |
198 | extern void cpu_hotplug_begin(void); |
199 | extern void cpu_hotplug_done(void); | |
86ef5c9a GS |
200 | extern void get_online_cpus(void); |
201 | extern void put_online_cpus(void); | |
16e53dbf SB |
202 | extern void cpu_hotplug_disable(void); |
203 | extern void cpu_hotplug_enable(void); | |
799e64f0 | 204 | #define hotcpu_notifier(fn, pri) cpu_notifier(fn, pri) |
93ae4f97 | 205 | #define __hotcpu_notifier(fn, pri) __cpu_notifier(fn, pri) |
39f4885c | 206 | #define register_hotcpu_notifier(nb) register_cpu_notifier(nb) |
93ae4f97 | 207 | #define __register_hotcpu_notifier(nb) __register_cpu_notifier(nb) |
39f4885c | 208 | #define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb) |
93ae4f97 | 209 | #define __unregister_hotcpu_notifier(nb) __unregister_cpu_notifier(nb) |
cb79295e | 210 | void clear_tasks_mm_cpumask(int cpu); |
1da177e4 | 211 | int cpu_down(unsigned int cpu); |
f7dff2b1 GS |
212 | |
213 | #else /* CONFIG_HOTPLUG_CPU */ | |
214 | ||
b9d10be7 TK |
215 | static inline void cpu_hotplug_begin(void) {} |
216 | static inline void cpu_hotplug_done(void) {} | |
86ef5c9a GS |
217 | #define get_online_cpus() do { } while (0) |
218 | #define put_online_cpus() do { } while (0) | |
16e53dbf SB |
219 | #define cpu_hotplug_disable() do { } while (0) |
220 | #define cpu_hotplug_enable() do { } while (0) | |
02316067 | 221 | #define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0) |
93ae4f97 | 222 | #define __hotcpu_notifier(fn, pri) do { (void)(fn); } while (0) |
761bb431 SS |
223 | /* These aren't inline functions due to a GCC bug. */ |
224 | #define register_hotcpu_notifier(nb) ({ (void)(nb); 0; }) | |
93ae4f97 | 225 | #define __register_hotcpu_notifier(nb) ({ (void)(nb); 0; }) |
761bb431 | 226 | #define unregister_hotcpu_notifier(nb) ({ (void)(nb); }) |
93ae4f97 | 227 | #define __unregister_hotcpu_notifier(nb) ({ (void)(nb); }) |
f7dff2b1 | 228 | #endif /* CONFIG_HOTPLUG_CPU */ |
1da177e4 | 229 | |
f3de4be9 | 230 | #ifdef CONFIG_PM_SLEEP_SMP |
d391e552 JM |
231 | extern int freeze_secondary_cpus(int primary); |
232 | static inline int disable_nonboot_cpus(void) | |
233 | { | |
234 | return freeze_secondary_cpus(0); | |
235 | } | |
e3920fb4 | 236 | extern void enable_nonboot_cpus(void); |
f3de4be9 | 237 | #else /* !CONFIG_PM_SLEEP_SMP */ |
e3920fb4 RW |
238 | static inline int disable_nonboot_cpus(void) { return 0; } |
239 | static inline void enable_nonboot_cpus(void) {} | |
f3de4be9 | 240 | #endif /* !CONFIG_PM_SLEEP_SMP */ |
e3920fb4 | 241 | |
a1a04ec3 | 242 | void cpu_startup_entry(enum cpuhp_state state); |
a1a04ec3 | 243 | |
d1669912 TG |
244 | void cpu_idle_poll_ctrl(bool enable); |
245 | ||
246 | void arch_cpu_idle(void); | |
247 | void arch_cpu_idle_prepare(void); | |
248 | void arch_cpu_idle_enter(void); | |
249 | void arch_cpu_idle_exit(void); | |
250 | void arch_cpu_idle_dead(void); | |
251 | ||
8038dad7 PM |
252 | int cpu_report_state(int cpu); |
253 | int cpu_check_up_prepare(int cpu); | |
254 | void cpu_set_state_online(int cpu); | |
255 | #ifdef CONFIG_HOTPLUG_CPU | |
256 | bool cpu_wait_death(unsigned int cpu, int seconds); | |
257 | bool cpu_report_death(void); | |
e69aab13 TG |
258 | void cpuhp_report_idle_dead(void); |
259 | #else | |
260 | static inline void cpuhp_report_idle_dead(void) { } | |
8038dad7 PM |
261 | #endif /* #ifdef CONFIG_HOTPLUG_CPU */ |
262 | ||
1da177e4 | 263 | #endif /* _LINUX_CPU_H_ */ |