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;
59 * CPU notifier priorities.
62 /* bring up workqueues before normal notifiers and down after */
63 CPU_PRI_WORKQUEUE_UP = 5,
64 CPU_PRI_WORKQUEUE_DOWN = -5,
67 #define CPU_ONLINE 0x0002 /* CPU (unsigned)v is up */
68 #define CPU_UP_PREPARE 0x0003 /* CPU (unsigned)v coming up */
69 #define CPU_UP_CANCELED 0x0004 /* CPU (unsigned)v NOT coming up */
70 #define CPU_DOWN_PREPARE 0x0005 /* CPU (unsigned)v going down */
71 #define CPU_DOWN_FAILED 0x0006 /* CPU (unsigned)v NOT going down */
72 #define CPU_DEAD 0x0007 /* CPU (unsigned)v dead */
73 #define CPU_DYING 0x0008 /* CPU (unsigned)v not running any task,
74 * not handling interrupts, soon dead.
75 * Called on the dying cpu, interrupts
76 * are already disabled. Must not
77 * sleep, must not fail */
78 #define CPU_POST_DEAD 0x0009 /* CPU (unsigned)v dead, cpu_hotplug
80 #define CPU_STARTING 0x000A /* CPU (unsigned)v soon running.
81 * Called on the new cpu, just before
82 * enabling interrupts. Must not sleep,
84 #define CPU_BROKEN 0x000B /* CPU (unsigned)v did not die properly,
85 * perhaps due to preemption. */
87 /* Used for CPU hotplug events occurring while tasks are frozen due to a suspend
88 * operation in progress
90 #define CPU_TASKS_FROZEN 0x0010
92 #define CPU_ONLINE_FROZEN (CPU_ONLINE | CPU_TASKS_FROZEN)
93 #define CPU_UP_PREPARE_FROZEN (CPU_UP_PREPARE | CPU_TASKS_FROZEN)
94 #define CPU_UP_CANCELED_FROZEN (CPU_UP_CANCELED | CPU_TASKS_FROZEN)
95 #define CPU_DOWN_PREPARE_FROZEN (CPU_DOWN_PREPARE | CPU_TASKS_FROZEN)
96 #define CPU_DOWN_FAILED_FROZEN (CPU_DOWN_FAILED | CPU_TASKS_FROZEN)
97 #define CPU_DEAD_FROZEN (CPU_DEAD | CPU_TASKS_FROZEN)
98 #define CPU_DYING_FROZEN (CPU_DYING | CPU_TASKS_FROZEN)
99 #define CPU_STARTING_FROZEN (CPU_STARTING | CPU_TASKS_FROZEN)
103 extern bool cpuhp_tasks_frozen;
104 /* Need to know about CPUs going up/down? */
105 #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE)
106 #define cpu_notifier(fn, pri) { \
107 static struct notifier_block fn##_nb = \
108 { .notifier_call = fn, .priority = pri }; \
109 register_cpu_notifier(&fn##_nb); \
112 #define __cpu_notifier(fn, pri) { \
113 static struct notifier_block fn##_nb = \
114 { .notifier_call = fn, .priority = pri }; \
115 __register_cpu_notifier(&fn##_nb); \
117 #else /* #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
118 #define cpu_notifier(fn, pri) do { (void)(fn); } while (0)
119 #define __cpu_notifier(fn, pri) do { (void)(fn); } while (0)
120 #endif /* #else #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
122 #ifdef CONFIG_HOTPLUG_CPU
123 extern int register_cpu_notifier(struct notifier_block *nb);
124 extern int __register_cpu_notifier(struct notifier_block *nb);
125 extern void unregister_cpu_notifier(struct notifier_block *nb);
126 extern void __unregister_cpu_notifier(struct notifier_block *nb);
130 extern int register_cpu_notifier(struct notifier_block *nb);
131 extern int __register_cpu_notifier(struct notifier_block *nb);
133 static inline int register_cpu_notifier(struct notifier_block *nb)
138 static inline int __register_cpu_notifier(struct notifier_block *nb)
144 static inline void unregister_cpu_notifier(struct notifier_block *nb)
148 static inline void __unregister_cpu_notifier(struct notifier_block *nb)
153 int cpu_up(unsigned int cpu);
154 void notify_cpu_starting(unsigned int cpu);
155 extern void cpu_maps_update_begin(void);
156 extern void cpu_maps_update_done(void);
158 #define cpu_notifier_register_begin cpu_maps_update_begin
159 #define cpu_notifier_register_done cpu_maps_update_done
161 #else /* CONFIG_SMP */
162 #define cpuhp_tasks_frozen 0
164 #define cpu_notifier(fn, pri) do { (void)(fn); } while (0)
165 #define __cpu_notifier(fn, pri) do { (void)(fn); } while (0)
167 static inline int register_cpu_notifier(struct notifier_block *nb)
172 static inline int __register_cpu_notifier(struct notifier_block *nb)
177 static inline void unregister_cpu_notifier(struct notifier_block *nb)
181 static inline void __unregister_cpu_notifier(struct notifier_block *nb)
185 static inline void cpu_maps_update_begin(void)
189 static inline void cpu_maps_update_done(void)
193 static inline void cpu_notifier_register_begin(void)
197 static inline void cpu_notifier_register_done(void)
201 #endif /* CONFIG_SMP */
202 extern struct bus_type cpu_subsys;
204 #ifdef CONFIG_HOTPLUG_CPU
205 /* Stop CPUs going up and down. */
207 extern void cpu_hotplug_begin(void);
208 extern void cpu_hotplug_done(void);
209 extern void get_online_cpus(void);
210 extern void put_online_cpus(void);
211 extern void cpu_hotplug_disable(void);
212 extern void cpu_hotplug_enable(void);
213 #define hotcpu_notifier(fn, pri) cpu_notifier(fn, pri)
214 #define __hotcpu_notifier(fn, pri) __cpu_notifier(fn, pri)
215 #define register_hotcpu_notifier(nb) register_cpu_notifier(nb)
216 #define __register_hotcpu_notifier(nb) __register_cpu_notifier(nb)
217 #define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb)
218 #define __unregister_hotcpu_notifier(nb) __unregister_cpu_notifier(nb)
219 void clear_tasks_mm_cpumask(int cpu);
220 int cpu_down(unsigned int cpu);
222 #else /* CONFIG_HOTPLUG_CPU */
224 static inline void cpu_hotplug_begin(void) {}
225 static inline void cpu_hotplug_done(void) {}
226 #define get_online_cpus() do { } while (0)
227 #define put_online_cpus() do { } while (0)
228 #define cpu_hotplug_disable() do { } while (0)
229 #define cpu_hotplug_enable() do { } while (0)
230 #define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0)
231 #define __hotcpu_notifier(fn, pri) do { (void)(fn); } while (0)
232 /* These aren't inline functions due to a GCC bug. */
233 #define register_hotcpu_notifier(nb) ({ (void)(nb); 0; })
234 #define __register_hotcpu_notifier(nb) ({ (void)(nb); 0; })
235 #define unregister_hotcpu_notifier(nb) ({ (void)(nb); })
236 #define __unregister_hotcpu_notifier(nb) ({ (void)(nb); })
237 #endif /* CONFIG_HOTPLUG_CPU */
239 #ifdef CONFIG_PM_SLEEP_SMP
240 extern int disable_nonboot_cpus(void);
241 extern void enable_nonboot_cpus(void);
242 #else /* !CONFIG_PM_SLEEP_SMP */
243 static inline int disable_nonboot_cpus(void) { return 0; }
244 static inline void enable_nonboot_cpus(void) {}
245 #endif /* !CONFIG_PM_SLEEP_SMP */
247 void cpu_startup_entry(enum cpuhp_state state);
249 void cpu_idle_poll_ctrl(bool enable);
251 void arch_cpu_idle(void);
252 void arch_cpu_idle_prepare(void);
253 void arch_cpu_idle_enter(void);
254 void arch_cpu_idle_exit(void);
255 void arch_cpu_idle_dead(void);
257 int cpu_report_state(int cpu);
258 int cpu_check_up_prepare(int cpu);
259 void cpu_set_state_online(int cpu);
260 #ifdef CONFIG_HOTPLUG_CPU
261 bool cpu_wait_death(unsigned int cpu, int seconds);
262 bool cpu_report_death(void);
263 void cpuhp_report_idle_dead(void);
265 static inline void cpuhp_report_idle_dead(void) { }
266 #endif /* #ifdef CONFIG_HOTPLUG_CPU */
268 #endif /* _LINUX_CPU_H_ */