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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 | ||
50a323b7 TH |
58 | /* |
59 | * CPU notifier priorities. | |
60 | */ | |
61 | enum { | |
3a101d05 TH |
62 | /* |
63 | * SCHED_ACTIVE marks a cpu which is coming up active during | |
64 | * CPU_ONLINE and CPU_DOWN_FAILED and must be the first | |
65 | * notifier. CPUSET_ACTIVE adjusts cpuset according to | |
66 | * cpu_active mask right after SCHED_ACTIVE. During | |
67 | * CPU_DOWN_PREPARE, SCHED_INACTIVE and CPUSET_INACTIVE are | |
68 | * ordered in the similar way. | |
69 | * | |
70 | * This ordering guarantees consistent cpu_active mask and | |
71 | * migration behavior to all cpu notifiers. | |
72 | */ | |
73 | CPU_PRI_SCHED_ACTIVE = INT_MAX, | |
74 | CPU_PRI_CPUSET_ACTIVE = INT_MAX - 1, | |
75 | CPU_PRI_SCHED_INACTIVE = INT_MIN + 1, | |
76 | CPU_PRI_CPUSET_INACTIVE = INT_MIN, | |
77 | ||
50a323b7 TH |
78 | /* migration should happen before other stuff but after perf */ |
79 | CPU_PRI_PERF = 20, | |
80 | CPU_PRI_MIGRATION = 10, | |
931ef163 | 81 | |
65758202 TH |
82 | /* bring up workqueues before normal notifiers and down after */ |
83 | CPU_PRI_WORKQUEUE_UP = 5, | |
84 | CPU_PRI_WORKQUEUE_DOWN = -5, | |
50a323b7 TH |
85 | }; |
86 | ||
80f1ff97 AW |
87 | #define CPU_ONLINE 0x0002 /* CPU (unsigned)v is up */ |
88 | #define CPU_UP_PREPARE 0x0003 /* CPU (unsigned)v coming up */ | |
89 | #define CPU_UP_CANCELED 0x0004 /* CPU (unsigned)v NOT coming up */ | |
90 | #define CPU_DOWN_PREPARE 0x0005 /* CPU (unsigned)v going down */ | |
91 | #define CPU_DOWN_FAILED 0x0006 /* CPU (unsigned)v NOT going down */ | |
92 | #define CPU_DEAD 0x0007 /* CPU (unsigned)v dead */ | |
93 | #define CPU_DYING 0x0008 /* CPU (unsigned)v not running any task, | |
94 | * not handling interrupts, soon dead. | |
95 | * Called on the dying cpu, interrupts | |
96 | * are already disabled. Must not | |
97 | * sleep, must not fail */ | |
98 | #define CPU_POST_DEAD 0x0009 /* CPU (unsigned)v dead, cpu_hotplug | |
99 | * lock is dropped */ | |
100 | #define CPU_STARTING 0x000A /* CPU (unsigned)v soon running. | |
101 | * Called on the new cpu, just before | |
102 | * enabling interrupts. Must not sleep, | |
103 | * must not fail */ | |
27d50c7e | 104 | #define CPU_BROKEN 0x000B /* CPU (unsigned)v did not die properly, |
8038dad7 | 105 | * perhaps due to preemption. */ |
80f1ff97 AW |
106 | |
107 | /* Used for CPU hotplug events occurring while tasks are frozen due to a suspend | |
108 | * operation in progress | |
109 | */ | |
110 | #define CPU_TASKS_FROZEN 0x0010 | |
111 | ||
112 | #define CPU_ONLINE_FROZEN (CPU_ONLINE | CPU_TASKS_FROZEN) | |
113 | #define CPU_UP_PREPARE_FROZEN (CPU_UP_PREPARE | CPU_TASKS_FROZEN) | |
114 | #define CPU_UP_CANCELED_FROZEN (CPU_UP_CANCELED | CPU_TASKS_FROZEN) | |
115 | #define CPU_DOWN_PREPARE_FROZEN (CPU_DOWN_PREPARE | CPU_TASKS_FROZEN) | |
116 | #define CPU_DOWN_FAILED_FROZEN (CPU_DOWN_FAILED | CPU_TASKS_FROZEN) | |
117 | #define CPU_DEAD_FROZEN (CPU_DEAD | CPU_TASKS_FROZEN) | |
118 | #define CPU_DYING_FROZEN (CPU_DYING | CPU_TASKS_FROZEN) | |
119 | #define CPU_STARTING_FROZEN (CPU_STARTING | CPU_TASKS_FROZEN) | |
120 | ||
121 | ||
1da177e4 | 122 | #ifdef CONFIG_SMP |
090e77c3 | 123 | extern bool cpuhp_tasks_frozen; |
1da177e4 | 124 | /* Need to know about CPUs going up/down? */ |
799e64f0 PM |
125 | #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) |
126 | #define cpu_notifier(fn, pri) { \ | |
0db0628d | 127 | static struct notifier_block fn##_nb = \ |
799e64f0 PM |
128 | { .notifier_call = fn, .priority = pri }; \ |
129 | register_cpu_notifier(&fn##_nb); \ | |
130 | } | |
93ae4f97 SB |
131 | |
132 | #define __cpu_notifier(fn, pri) { \ | |
133 | static struct notifier_block fn##_nb = \ | |
134 | { .notifier_call = fn, .priority = pri }; \ | |
135 | __register_cpu_notifier(&fn##_nb); \ | |
136 | } | |
799e64f0 PM |
137 | #else /* #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */ |
138 | #define cpu_notifier(fn, pri) do { (void)(fn); } while (0) | |
93ae4f97 | 139 | #define __cpu_notifier(fn, pri) do { (void)(fn); } while (0) |
799e64f0 | 140 | #endif /* #else #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */ |
93ae4f97 | 141 | |
65edc68c | 142 | #ifdef CONFIG_HOTPLUG_CPU |
47e627bc | 143 | extern int register_cpu_notifier(struct notifier_block *nb); |
93ae4f97 | 144 | extern int __register_cpu_notifier(struct notifier_block *nb); |
1da177e4 | 145 | extern void unregister_cpu_notifier(struct notifier_block *nb); |
93ae4f97 | 146 | extern void __unregister_cpu_notifier(struct notifier_block *nb); |
65edc68c | 147 | #else |
47e627bc AK |
148 | |
149 | #ifndef MODULE | |
150 | extern int register_cpu_notifier(struct notifier_block *nb); | |
93ae4f97 | 151 | extern int __register_cpu_notifier(struct notifier_block *nb); |
47e627bc AK |
152 | #else |
153 | static inline int register_cpu_notifier(struct notifier_block *nb) | |
154 | { | |
155 | return 0; | |
156 | } | |
93ae4f97 SB |
157 | |
158 | static inline int __register_cpu_notifier(struct notifier_block *nb) | |
159 | { | |
160 | return 0; | |
161 | } | |
47e627bc AK |
162 | #endif |
163 | ||
65edc68c CS |
164 | static inline void unregister_cpu_notifier(struct notifier_block *nb) |
165 | { | |
166 | } | |
93ae4f97 SB |
167 | |
168 | static inline void __unregister_cpu_notifier(struct notifier_block *nb) | |
169 | { | |
170 | } | |
65edc68c | 171 | #endif |
1da177e4 LT |
172 | |
173 | int cpu_up(unsigned int cpu); | |
e545a614 | 174 | void notify_cpu_starting(unsigned int cpu); |
3da1c84c ON |
175 | extern void cpu_maps_update_begin(void); |
176 | extern void cpu_maps_update_done(void); | |
d0d23b54 | 177 | |
93ae4f97 SB |
178 | #define cpu_notifier_register_begin cpu_maps_update_begin |
179 | #define cpu_notifier_register_done cpu_maps_update_done | |
180 | ||
3da1c84c | 181 | #else /* CONFIG_SMP */ |
090e77c3 | 182 | #define cpuhp_tasks_frozen 0 |
1da177e4 | 183 | |
799e64f0 | 184 | #define cpu_notifier(fn, pri) do { (void)(fn); } while (0) |
93ae4f97 | 185 | #define __cpu_notifier(fn, pri) do { (void)(fn); } while (0) |
799e64f0 | 186 | |
1da177e4 LT |
187 | static inline int register_cpu_notifier(struct notifier_block *nb) |
188 | { | |
189 | return 0; | |
190 | } | |
d0d23b54 | 191 | |
93ae4f97 SB |
192 | static inline int __register_cpu_notifier(struct notifier_block *nb) |
193 | { | |
194 | return 0; | |
195 | } | |
196 | ||
1da177e4 LT |
197 | static inline void unregister_cpu_notifier(struct notifier_block *nb) |
198 | { | |
199 | } | |
200 | ||
93ae4f97 SB |
201 | static inline void __unregister_cpu_notifier(struct notifier_block *nb) |
202 | { | |
203 | } | |
204 | ||
3da1c84c ON |
205 | static inline void cpu_maps_update_begin(void) |
206 | { | |
207 | } | |
208 | ||
209 | static inline void cpu_maps_update_done(void) | |
210 | { | |
211 | } | |
212 | ||
93ae4f97 SB |
213 | static inline void cpu_notifier_register_begin(void) |
214 | { | |
215 | } | |
216 | ||
217 | static inline void cpu_notifier_register_done(void) | |
218 | { | |
219 | } | |
220 | ||
1da177e4 | 221 | #endif /* CONFIG_SMP */ |
8a25a2fd | 222 | extern struct bus_type cpu_subsys; |
1da177e4 LT |
223 | |
224 | #ifdef CONFIG_HOTPLUG_CPU | |
225 | /* Stop CPUs going up and down. */ | |
f7dff2b1 | 226 | |
b9d10be7 TK |
227 | extern void cpu_hotplug_begin(void); |
228 | extern void cpu_hotplug_done(void); | |
86ef5c9a GS |
229 | extern void get_online_cpus(void); |
230 | extern void put_online_cpus(void); | |
16e53dbf SB |
231 | extern void cpu_hotplug_disable(void); |
232 | extern void cpu_hotplug_enable(void); | |
799e64f0 | 233 | #define hotcpu_notifier(fn, pri) cpu_notifier(fn, pri) |
93ae4f97 | 234 | #define __hotcpu_notifier(fn, pri) __cpu_notifier(fn, pri) |
39f4885c | 235 | #define register_hotcpu_notifier(nb) register_cpu_notifier(nb) |
93ae4f97 | 236 | #define __register_hotcpu_notifier(nb) __register_cpu_notifier(nb) |
39f4885c | 237 | #define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb) |
93ae4f97 | 238 | #define __unregister_hotcpu_notifier(nb) __unregister_cpu_notifier(nb) |
cb79295e | 239 | void clear_tasks_mm_cpumask(int cpu); |
1da177e4 | 240 | int cpu_down(unsigned int cpu); |
f7dff2b1 GS |
241 | |
242 | #else /* CONFIG_HOTPLUG_CPU */ | |
243 | ||
b9d10be7 TK |
244 | static inline void cpu_hotplug_begin(void) {} |
245 | static inline void cpu_hotplug_done(void) {} | |
86ef5c9a GS |
246 | #define get_online_cpus() do { } while (0) |
247 | #define put_online_cpus() do { } while (0) | |
16e53dbf SB |
248 | #define cpu_hotplug_disable() do { } while (0) |
249 | #define cpu_hotplug_enable() do { } while (0) | |
02316067 | 250 | #define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0) |
93ae4f97 | 251 | #define __hotcpu_notifier(fn, pri) do { (void)(fn); } while (0) |
761bb431 SS |
252 | /* These aren't inline functions due to a GCC bug. */ |
253 | #define register_hotcpu_notifier(nb) ({ (void)(nb); 0; }) | |
93ae4f97 | 254 | #define __register_hotcpu_notifier(nb) ({ (void)(nb); 0; }) |
761bb431 | 255 | #define unregister_hotcpu_notifier(nb) ({ (void)(nb); }) |
93ae4f97 | 256 | #define __unregister_hotcpu_notifier(nb) ({ (void)(nb); }) |
f7dff2b1 | 257 | #endif /* CONFIG_HOTPLUG_CPU */ |
1da177e4 | 258 | |
f3de4be9 | 259 | #ifdef CONFIG_PM_SLEEP_SMP |
e3920fb4 RW |
260 | extern int disable_nonboot_cpus(void); |
261 | extern void enable_nonboot_cpus(void); | |
f3de4be9 | 262 | #else /* !CONFIG_PM_SLEEP_SMP */ |
e3920fb4 RW |
263 | static inline int disable_nonboot_cpus(void) { return 0; } |
264 | static inline void enable_nonboot_cpus(void) {} | |
f3de4be9 | 265 | #endif /* !CONFIG_PM_SLEEP_SMP */ |
e3920fb4 | 266 | |
a1a04ec3 | 267 | void cpu_startup_entry(enum cpuhp_state state); |
a1a04ec3 | 268 | |
d1669912 TG |
269 | void cpu_idle_poll_ctrl(bool enable); |
270 | ||
271 | void arch_cpu_idle(void); | |
272 | void arch_cpu_idle_prepare(void); | |
273 | void arch_cpu_idle_enter(void); | |
274 | void arch_cpu_idle_exit(void); | |
275 | void arch_cpu_idle_dead(void); | |
276 | ||
8038dad7 PM |
277 | int cpu_report_state(int cpu); |
278 | int cpu_check_up_prepare(int cpu); | |
279 | void cpu_set_state_online(int cpu); | |
280 | #ifdef CONFIG_HOTPLUG_CPU | |
281 | bool cpu_wait_death(unsigned int cpu, int seconds); | |
282 | bool cpu_report_death(void); | |
e69aab13 TG |
283 | void cpuhp_report_idle_dead(void); |
284 | #else | |
285 | static inline void cpuhp_report_idle_dead(void) { } | |
8038dad7 PM |
286 | #endif /* #ifdef CONFIG_HOTPLUG_CPU */ |
287 | ||
1da177e4 | 288 | #endif /* _LINUX_CPU_H_ */ |