2 * include/linux/cpu.h - generic cpu definition
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.
8 * Basic handling of the devices is done in drivers/base/cpu.c
10 * CPUs are exported via sysfs in the devices/system/cpu
16 #include <linux/node.h>
17 #include <linux/compiler.h>
18 #include <linux/cpumask.h>
19 #include <linux/cpuhotplug.h>
23 struct attribute_group;
26 int node_id; /* The node which contains the CPU */
27 int hotpluggable; /* creates sysfs control file if hotpluggable */
31 extern void boot_cpu_init(void);
32 extern void boot_cpu_state_init(void);
34 extern int register_cpu(struct cpu *cpu, int num);
35 extern struct device *get_cpu_device(unsigned cpu);
36 extern bool cpu_is_hotpluggable(unsigned cpu);
37 extern bool arch_match_cpu_phys_id(int cpu, u64 phys_id);
38 extern bool arch_find_n_match_cpu_physical_id(struct device_node *cpun,
39 int cpu, unsigned int *thread);
41 extern int cpu_add_dev_attr(struct device_attribute *attr);
42 extern void cpu_remove_dev_attr(struct device_attribute *attr);
44 extern int cpu_add_dev_attr_group(struct attribute_group *attrs);
45 extern void cpu_remove_dev_attr_group(struct attribute_group *attrs);
48 struct device *cpu_device_create(struct device *parent, void *drvdata,
49 const struct attribute_group **groups,
50 const char *fmt, ...);
51 #ifdef CONFIG_HOTPLUG_CPU
52 extern void unregister_cpu(struct cpu *cpu);
53 extern ssize_t arch_cpu_probe(const char *, size_t);
54 extern ssize_t arch_cpu_release(const char *, size_t);
56 struct notifier_block;
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_POST_DEAD 0x0009 /* CPU (unsigned)v dead, cpu_hotplug
66 #define CPU_BROKEN 0x000B /* CPU (unsigned)v did not die properly,
67 * perhaps due to preemption. */
69 /* Used for CPU hotplug events occurring while tasks are frozen due to a suspend
70 * operation in progress
72 #define CPU_TASKS_FROZEN 0x0010
74 #define CPU_ONLINE_FROZEN (CPU_ONLINE | CPU_TASKS_FROZEN)
75 #define CPU_UP_PREPARE_FROZEN (CPU_UP_PREPARE | CPU_TASKS_FROZEN)
76 #define CPU_UP_CANCELED_FROZEN (CPU_UP_CANCELED | CPU_TASKS_FROZEN)
77 #define CPU_DOWN_PREPARE_FROZEN (CPU_DOWN_PREPARE | CPU_TASKS_FROZEN)
78 #define CPU_DOWN_FAILED_FROZEN (CPU_DOWN_FAILED | CPU_TASKS_FROZEN)
79 #define CPU_DEAD_FROZEN (CPU_DEAD | CPU_TASKS_FROZEN)
82 extern bool cpuhp_tasks_frozen;
83 /* Need to know about CPUs going up/down? */
84 #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE)
85 #define cpu_notifier(fn, pri) { \
86 static struct notifier_block fn##_nb = \
87 { .notifier_call = fn, .priority = pri }; \
88 register_cpu_notifier(&fn##_nb); \
91 #define __cpu_notifier(fn, pri) { \
92 static struct notifier_block fn##_nb = \
93 { .notifier_call = fn, .priority = pri }; \
94 __register_cpu_notifier(&fn##_nb); \
97 extern int register_cpu_notifier(struct notifier_block *nb);
98 extern int __register_cpu_notifier(struct notifier_block *nb);
99 extern void unregister_cpu_notifier(struct notifier_block *nb);
100 extern void __unregister_cpu_notifier(struct notifier_block *nb);
102 #else /* #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
103 #define cpu_notifier(fn, pri) do { (void)(fn); } while (0)
104 #define __cpu_notifier(fn, pri) do { (void)(fn); } while (0)
106 static inline int register_cpu_notifier(struct notifier_block *nb)
111 static inline int __register_cpu_notifier(struct notifier_block *nb)
116 static inline void unregister_cpu_notifier(struct notifier_block *nb)
120 static inline void __unregister_cpu_notifier(struct notifier_block *nb)
125 int cpu_up(unsigned int cpu);
126 void notify_cpu_starting(unsigned int cpu);
127 extern void cpu_maps_update_begin(void);
128 extern void cpu_maps_update_done(void);
130 #define cpu_notifier_register_begin cpu_maps_update_begin
131 #define cpu_notifier_register_done cpu_maps_update_done
133 #else /* CONFIG_SMP */
134 #define cpuhp_tasks_frozen 0
136 #define cpu_notifier(fn, pri) do { (void)(fn); } while (0)
137 #define __cpu_notifier(fn, pri) do { (void)(fn); } while (0)
139 static inline int register_cpu_notifier(struct notifier_block *nb)
144 static inline int __register_cpu_notifier(struct notifier_block *nb)
149 static inline void unregister_cpu_notifier(struct notifier_block *nb)
153 static inline void __unregister_cpu_notifier(struct notifier_block *nb)
157 static inline void cpu_maps_update_begin(void)
161 static inline void cpu_maps_update_done(void)
165 static inline void cpu_notifier_register_begin(void)
169 static inline void cpu_notifier_register_done(void)
173 #endif /* CONFIG_SMP */
174 extern struct bus_type cpu_subsys;
176 #ifdef CONFIG_HOTPLUG_CPU
177 /* Stop CPUs going up and down. */
179 extern void cpu_hotplug_begin(void);
180 extern void cpu_hotplug_done(void);
181 extern void get_online_cpus(void);
182 extern void put_online_cpus(void);
183 extern void cpu_hotplug_disable(void);
184 extern void cpu_hotplug_enable(void);
185 #define hotcpu_notifier(fn, pri) cpu_notifier(fn, pri)
186 #define __hotcpu_notifier(fn, pri) __cpu_notifier(fn, pri)
187 #define register_hotcpu_notifier(nb) register_cpu_notifier(nb)
188 #define __register_hotcpu_notifier(nb) __register_cpu_notifier(nb)
189 #define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb)
190 #define __unregister_hotcpu_notifier(nb) __unregister_cpu_notifier(nb)
191 void clear_tasks_mm_cpumask(int cpu);
192 int cpu_down(unsigned int cpu);
194 #else /* CONFIG_HOTPLUG_CPU */
196 static inline void cpu_hotplug_begin(void) {}
197 static inline void cpu_hotplug_done(void) {}
198 #define get_online_cpus() do { } while (0)
199 #define put_online_cpus() do { } while (0)
200 #define cpu_hotplug_disable() do { } while (0)
201 #define cpu_hotplug_enable() do { } while (0)
202 #define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0)
203 #define __hotcpu_notifier(fn, pri) do { (void)(fn); } while (0)
204 /* These aren't inline functions due to a GCC bug. */
205 #define register_hotcpu_notifier(nb) ({ (void)(nb); 0; })
206 #define __register_hotcpu_notifier(nb) ({ (void)(nb); 0; })
207 #define unregister_hotcpu_notifier(nb) ({ (void)(nb); })
208 #define __unregister_hotcpu_notifier(nb) ({ (void)(nb); })
209 #endif /* CONFIG_HOTPLUG_CPU */
211 #ifdef CONFIG_PM_SLEEP_SMP
212 extern int freeze_secondary_cpus(int primary);
213 static inline int disable_nonboot_cpus(void)
215 return freeze_secondary_cpus(0);
217 extern void enable_nonboot_cpus(void);
218 #else /* !CONFIG_PM_SLEEP_SMP */
219 static inline int disable_nonboot_cpus(void) { return 0; }
220 static inline void enable_nonboot_cpus(void) {}
221 #endif /* !CONFIG_PM_SLEEP_SMP */
223 void cpu_startup_entry(enum cpuhp_state state);
225 void cpu_idle_poll_ctrl(bool enable);
227 /* Attach to any functions which should be considered cpuidle. */
228 #define __cpuidle __attribute__((__section__(".cpuidle.text")))
230 bool cpu_in_idle(unsigned long pc);
232 void arch_cpu_idle(void);
233 void arch_cpu_idle_prepare(void);
234 void arch_cpu_idle_enter(void);
235 void arch_cpu_idle_exit(void);
236 void arch_cpu_idle_dead(void);
238 int cpu_report_state(int cpu);
239 int cpu_check_up_prepare(int cpu);
240 void cpu_set_state_online(int cpu);
241 #ifdef CONFIG_HOTPLUG_CPU
242 bool cpu_wait_death(unsigned int cpu, int seconds);
243 bool cpu_report_death(void);
244 void cpuhp_report_idle_dead(void);
246 static inline void cpuhp_report_idle_dead(void) { }
247 #endif /* #ifdef CONFIG_HOTPLUG_CPU */
249 #endif /* _LINUX_CPU_H_ */