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.
64 /* bring up workqueues before normal notifiers and down after */
65 CPU_PRI_WORKQUEUE_UP
= 5,
66 CPU_PRI_WORKQUEUE_DOWN
= -5,
69 #define CPU_ONLINE 0x0002 /* CPU (unsigned)v is up */
70 #define CPU_UP_PREPARE 0x0003 /* CPU (unsigned)v coming up */
71 #define CPU_UP_CANCELED 0x0004 /* CPU (unsigned)v NOT coming up */
72 #define CPU_DOWN_PREPARE 0x0005 /* CPU (unsigned)v going down */
73 #define CPU_DOWN_FAILED 0x0006 /* CPU (unsigned)v NOT going down */
74 #define CPU_DEAD 0x0007 /* CPU (unsigned)v dead */
75 #define CPU_DYING 0x0008 /* CPU (unsigned)v not running any task,
76 * not handling interrupts, soon dead.
77 * Called on the dying cpu, interrupts
78 * are already disabled. Must not
79 * sleep, must not fail */
80 #define CPU_POST_DEAD 0x0009 /* CPU (unsigned)v dead, cpu_hotplug
82 #define CPU_STARTING 0x000A /* CPU (unsigned)v soon running.
83 * Called on the new cpu, just before
84 * enabling interrupts. Must not sleep,
86 #define CPU_BROKEN 0x000B /* CPU (unsigned)v did not die properly,
87 * perhaps due to preemption. */
89 /* Used for CPU hotplug events occurring while tasks are frozen due to a suspend
90 * operation in progress
92 #define CPU_TASKS_FROZEN 0x0010
94 #define CPU_ONLINE_FROZEN (CPU_ONLINE | CPU_TASKS_FROZEN)
95 #define CPU_UP_PREPARE_FROZEN (CPU_UP_PREPARE | CPU_TASKS_FROZEN)
96 #define CPU_UP_CANCELED_FROZEN (CPU_UP_CANCELED | CPU_TASKS_FROZEN)
97 #define CPU_DOWN_PREPARE_FROZEN (CPU_DOWN_PREPARE | CPU_TASKS_FROZEN)
98 #define CPU_DOWN_FAILED_FROZEN (CPU_DOWN_FAILED | CPU_TASKS_FROZEN)
99 #define CPU_DEAD_FROZEN (CPU_DEAD | CPU_TASKS_FROZEN)
100 #define CPU_DYING_FROZEN (CPU_DYING | CPU_TASKS_FROZEN)
101 #define CPU_STARTING_FROZEN (CPU_STARTING | CPU_TASKS_FROZEN)
105 extern bool cpuhp_tasks_frozen
;
106 /* Need to know about CPUs going up/down? */
107 #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE)
108 #define cpu_notifier(fn, pri) { \
109 static struct notifier_block fn##_nb = \
110 { .notifier_call = fn, .priority = pri }; \
111 register_cpu_notifier(&fn##_nb); \
114 #define __cpu_notifier(fn, pri) { \
115 static struct notifier_block fn##_nb = \
116 { .notifier_call = fn, .priority = pri }; \
117 __register_cpu_notifier(&fn##_nb); \
119 #else /* #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
120 #define cpu_notifier(fn, pri) do { (void)(fn); } while (0)
121 #define __cpu_notifier(fn, pri) do { (void)(fn); } while (0)
122 #endif /* #else #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
124 #ifdef CONFIG_HOTPLUG_CPU
125 extern int register_cpu_notifier(struct notifier_block
*nb
);
126 extern int __register_cpu_notifier(struct notifier_block
*nb
);
127 extern void unregister_cpu_notifier(struct notifier_block
*nb
);
128 extern void __unregister_cpu_notifier(struct notifier_block
*nb
);
132 extern int register_cpu_notifier(struct notifier_block
*nb
);
133 extern int __register_cpu_notifier(struct notifier_block
*nb
);
135 static inline int register_cpu_notifier(struct notifier_block
*nb
)
140 static inline int __register_cpu_notifier(struct notifier_block
*nb
)
146 static inline void unregister_cpu_notifier(struct notifier_block
*nb
)
150 static inline void __unregister_cpu_notifier(struct notifier_block
*nb
)
155 int cpu_up(unsigned int cpu
);
156 void notify_cpu_starting(unsigned int cpu
);
157 extern void cpu_maps_update_begin(void);
158 extern void cpu_maps_update_done(void);
160 #define cpu_notifier_register_begin cpu_maps_update_begin
161 #define cpu_notifier_register_done cpu_maps_update_done
163 #else /* CONFIG_SMP */
164 #define cpuhp_tasks_frozen 0
166 #define cpu_notifier(fn, pri) do { (void)(fn); } while (0)
167 #define __cpu_notifier(fn, pri) do { (void)(fn); } while (0)
169 static inline int register_cpu_notifier(struct notifier_block
*nb
)
174 static inline int __register_cpu_notifier(struct notifier_block
*nb
)
179 static inline void unregister_cpu_notifier(struct notifier_block
*nb
)
183 static inline void __unregister_cpu_notifier(struct notifier_block
*nb
)
187 static inline void cpu_maps_update_begin(void)
191 static inline void cpu_maps_update_done(void)
195 static inline void cpu_notifier_register_begin(void)
199 static inline void cpu_notifier_register_done(void)
203 #endif /* CONFIG_SMP */
204 extern struct bus_type cpu_subsys
;
206 #ifdef CONFIG_HOTPLUG_CPU
207 /* Stop CPUs going up and down. */
209 extern void cpu_hotplug_begin(void);
210 extern void cpu_hotplug_done(void);
211 extern void get_online_cpus(void);
212 extern void put_online_cpus(void);
213 extern void cpu_hotplug_disable(void);
214 extern void cpu_hotplug_enable(void);
215 #define hotcpu_notifier(fn, pri) cpu_notifier(fn, pri)
216 #define __hotcpu_notifier(fn, pri) __cpu_notifier(fn, pri)
217 #define register_hotcpu_notifier(nb) register_cpu_notifier(nb)
218 #define __register_hotcpu_notifier(nb) __register_cpu_notifier(nb)
219 #define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb)
220 #define __unregister_hotcpu_notifier(nb) __unregister_cpu_notifier(nb)
221 void clear_tasks_mm_cpumask(int cpu
);
222 int cpu_down(unsigned int cpu
);
224 #else /* CONFIG_HOTPLUG_CPU */
226 static inline void cpu_hotplug_begin(void) {}
227 static inline void cpu_hotplug_done(void) {}
228 #define get_online_cpus() do { } while (0)
229 #define put_online_cpus() do { } while (0)
230 #define cpu_hotplug_disable() do { } while (0)
231 #define cpu_hotplug_enable() do { } while (0)
232 #define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0)
233 #define __hotcpu_notifier(fn, pri) do { (void)(fn); } while (0)
234 /* These aren't inline functions due to a GCC bug. */
235 #define register_hotcpu_notifier(nb) ({ (void)(nb); 0; })
236 #define __register_hotcpu_notifier(nb) ({ (void)(nb); 0; })
237 #define unregister_hotcpu_notifier(nb) ({ (void)(nb); })
238 #define __unregister_hotcpu_notifier(nb) ({ (void)(nb); })
239 #endif /* CONFIG_HOTPLUG_CPU */
241 #ifdef CONFIG_PM_SLEEP_SMP
242 extern int disable_nonboot_cpus(void);
243 extern void enable_nonboot_cpus(void);
244 #else /* !CONFIG_PM_SLEEP_SMP */
245 static inline int disable_nonboot_cpus(void) { return 0; }
246 static inline void enable_nonboot_cpus(void) {}
247 #endif /* !CONFIG_PM_SLEEP_SMP */
249 void cpu_startup_entry(enum cpuhp_state state
);
251 void cpu_idle_poll_ctrl(bool enable
);
253 void arch_cpu_idle(void);
254 void arch_cpu_idle_prepare(void);
255 void arch_cpu_idle_enter(void);
256 void arch_cpu_idle_exit(void);
257 void arch_cpu_idle_dead(void);
259 int cpu_report_state(int cpu
);
260 int cpu_check_up_prepare(int cpu
);
261 void cpu_set_state_online(int cpu
);
262 #ifdef CONFIG_HOTPLUG_CPU
263 bool cpu_wait_death(unsigned int cpu
, int seconds
);
264 bool cpu_report_death(void);
265 void cpuhp_report_idle_dead(void);
267 static inline void cpuhp_report_idle_dead(void) { }
268 #endif /* #ifdef CONFIG_HOTPLUG_CPU */
270 #endif /* _LINUX_CPU_H_ */
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