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);
33 extern void cpu_init(void);
34 extern void trap_init(void);
36 extern int register_cpu(struct cpu *cpu, int num);
37 extern struct device *get_cpu_device(unsigned cpu);
38 extern bool cpu_is_hotpluggable(unsigned cpu);
39 extern bool arch_match_cpu_phys_id(int cpu, u64 phys_id);
40 extern bool arch_find_n_match_cpu_physical_id(struct device_node *cpun,
41 int cpu, unsigned int *thread);
43 extern int cpu_add_dev_attr(struct device_attribute *attr);
44 extern void cpu_remove_dev_attr(struct device_attribute *attr);
46 extern int cpu_add_dev_attr_group(struct attribute_group *attrs);
47 extern void cpu_remove_dev_attr_group(struct attribute_group *attrs);
50 struct device *cpu_device_create(struct device *parent, void *drvdata,
51 const struct attribute_group **groups,
52 const char *fmt, ...);
53 #ifdef CONFIG_HOTPLUG_CPU
54 extern void unregister_cpu(struct cpu *cpu);
55 extern ssize_t arch_cpu_probe(const char *, size_t);
56 extern ssize_t arch_cpu_release(const char *, size_t);
60 * These states are not related to the core CPU hotplug mechanism. They are
61 * used by various (sub)architectures to track internal state
63 #define CPU_ONLINE 0x0002 /* CPU is up */
64 #define CPU_UP_PREPARE 0x0003 /* CPU coming up */
65 #define CPU_DEAD 0x0007 /* CPU dead */
66 #define CPU_DEAD_FROZEN 0x0008 /* CPU timed out on unplug */
67 #define CPU_POST_DEAD 0x0009 /* CPU successfully unplugged */
68 #define CPU_BROKEN 0x000B /* CPU did not die properly */
71 extern bool cpuhp_tasks_frozen;
72 int cpu_up(unsigned int cpu);
73 void notify_cpu_starting(unsigned int cpu);
74 extern void cpu_maps_update_begin(void);
75 extern void cpu_maps_update_done(void);
77 #else /* CONFIG_SMP */
78 #define cpuhp_tasks_frozen 0
80 static inline void cpu_maps_update_begin(void)
84 static inline void cpu_maps_update_done(void)
88 #endif /* CONFIG_SMP */
89 extern struct bus_type cpu_subsys;
91 #ifdef CONFIG_HOTPLUG_CPU
92 extern void cpus_write_lock(void);
93 extern void cpus_write_unlock(void);
94 extern void cpus_read_lock(void);
95 extern void cpus_read_unlock(void);
96 extern void lockdep_assert_cpus_held(void);
97 extern void cpu_hotplug_disable(void);
98 extern void cpu_hotplug_enable(void);
99 void clear_tasks_mm_cpumask(int cpu);
100 int cpu_down(unsigned int cpu);
102 #else /* CONFIG_HOTPLUG_CPU */
104 static inline void cpus_write_lock(void) { }
105 static inline void cpus_write_unlock(void) { }
106 static inline void cpus_read_lock(void) { }
107 static inline void cpus_read_unlock(void) { }
108 static inline void lockdep_assert_cpus_held(void) { }
109 static inline void cpu_hotplug_disable(void) { }
110 static inline void cpu_hotplug_enable(void) { }
111 #endif /* !CONFIG_HOTPLUG_CPU */
113 /* Wrappers which go away once all code is converted */
114 static inline void cpu_hotplug_begin(void) { cpus_write_lock(); }
115 static inline void cpu_hotplug_done(void) { cpus_write_unlock(); }
116 static inline void get_online_cpus(void) { cpus_read_lock(); }
117 static inline void put_online_cpus(void) { cpus_read_unlock(); }
119 #ifdef CONFIG_PM_SLEEP_SMP
120 extern int freeze_secondary_cpus(int primary);
121 static inline int disable_nonboot_cpus(void)
123 return freeze_secondary_cpus(0);
125 extern void enable_nonboot_cpus(void);
126 #else /* !CONFIG_PM_SLEEP_SMP */
127 static inline int disable_nonboot_cpus(void) { return 0; }
128 static inline void enable_nonboot_cpus(void) {}
129 #endif /* !CONFIG_PM_SLEEP_SMP */
131 void cpu_startup_entry(enum cpuhp_state state);
133 void cpu_idle_poll_ctrl(bool enable);
135 /* Attach to any functions which should be considered cpuidle. */
136 #define __cpuidle __attribute__((__section__(".cpuidle.text")))
138 bool cpu_in_idle(unsigned long pc);
140 void arch_cpu_idle(void);
141 void arch_cpu_idle_prepare(void);
142 void arch_cpu_idle_enter(void);
143 void arch_cpu_idle_exit(void);
144 void arch_cpu_idle_dead(void);
146 int cpu_report_state(int cpu);
147 int cpu_check_up_prepare(int cpu);
148 void cpu_set_state_online(int cpu);
149 void play_idle(unsigned long duration_ms);
151 #ifdef CONFIG_HOTPLUG_CPU
152 bool cpu_wait_death(unsigned int cpu, int seconds);
153 bool cpu_report_death(void);
154 void cpuhp_report_idle_dead(void);
156 static inline void cpuhp_report_idle_dead(void) { }
157 #endif /* #ifdef CONFIG_HOTPLUG_CPU */
159 #endif /* _LINUX_CPU_H_ */