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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - include/linux/cpu.h
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);
58 struct notifier_block
;
60 #define CPU_ONLINE 0x0002 /* CPU (unsigned)v is up */
61 #define CPU_UP_PREPARE 0x0003 /* CPU (unsigned)v coming up */
62 #define CPU_DEAD 0x0007 /* CPU (unsigned)v dead */
63 #define CPU_POST_DEAD 0x0009 /* CPU (unsigned)v dead, cpu_hotplug
65 #define CPU_BROKEN 0x000B /* CPU (unsigned)v did not die properly,
66 * perhaps due to preemption. */
68 /* Used for CPU hotplug events occurring while tasks are frozen due to a suspend
69 * operation in progress
71 #define CPU_TASKS_FROZEN 0x0010
73 #define CPU_ONLINE_FROZEN (CPU_ONLINE | CPU_TASKS_FROZEN)
74 #define CPU_UP_PREPARE_FROZEN (CPU_UP_PREPARE | CPU_TASKS_FROZEN)
75 #define CPU_UP_CANCELED_FROZEN (CPU_UP_CANCELED | CPU_TASKS_FROZEN)
76 #define CPU_DOWN_PREPARE_FROZEN (CPU_DOWN_PREPARE | CPU_TASKS_FROZEN)
77 #define CPU_DOWN_FAILED_FROZEN (CPU_DOWN_FAILED | CPU_TASKS_FROZEN)
78 #define CPU_DEAD_FROZEN (CPU_DEAD | CPU_TASKS_FROZEN)
81 extern bool cpuhp_tasks_frozen
;
82 int cpu_up(unsigned int cpu
);
83 void notify_cpu_starting(unsigned int cpu
);
84 extern void cpu_maps_update_begin(void);
85 extern void cpu_maps_update_done(void);
87 #else /* CONFIG_SMP */
88 #define cpuhp_tasks_frozen 0
90 static inline void cpu_maps_update_begin(void)
94 static inline void cpu_maps_update_done(void)
98 #endif /* CONFIG_SMP */
99 extern struct bus_type cpu_subsys
;
101 #ifdef CONFIG_HOTPLUG_CPU
102 extern void cpus_write_lock(void);
103 extern void cpus_write_unlock(void);
104 extern void cpus_read_lock(void);
105 extern void cpus_read_unlock(void);
106 extern void lockdep_assert_cpus_held(void);
107 extern void cpu_hotplug_disable(void);
108 extern void cpu_hotplug_enable(void);
109 void clear_tasks_mm_cpumask(int cpu
);
110 int cpu_down(unsigned int cpu
);
112 #else /* CONFIG_HOTPLUG_CPU */
114 static inline void cpus_write_lock(void) { }
115 static inline void cpus_write_unlock(void) { }
116 static inline void cpus_read_lock(void) { }
117 static inline void cpus_read_unlock(void) { }
118 static inline void lockdep_assert_cpus_held(void) { }
119 static inline void cpu_hotplug_disable(void) { }
120 static inline void cpu_hotplug_enable(void) { }
121 #endif /* !CONFIG_HOTPLUG_CPU */
123 /* Wrappers which go away once all code is converted */
124 static inline void cpu_hotplug_begin(void) { cpus_write_lock(); }
125 static inline void cpu_hotplug_done(void) { cpus_write_unlock(); }
126 static inline void get_online_cpus(void) { cpus_read_lock(); }
127 static inline void put_online_cpus(void) { cpus_read_unlock(); }
129 #ifdef CONFIG_PM_SLEEP_SMP
130 extern int freeze_secondary_cpus(int primary
);
131 static inline int disable_nonboot_cpus(void)
133 return freeze_secondary_cpus(0);
135 extern void enable_nonboot_cpus(void);
136 #else /* !CONFIG_PM_SLEEP_SMP */
137 static inline int disable_nonboot_cpus(void) { return 0; }
138 static inline void enable_nonboot_cpus(void) {}
139 #endif /* !CONFIG_PM_SLEEP_SMP */
141 void cpu_startup_entry(enum cpuhp_state state
);
143 void cpu_idle_poll_ctrl(bool enable
);
145 /* Attach to any functions which should be considered cpuidle. */
146 #define __cpuidle __attribute__((__section__(".cpuidle.text")))
148 bool cpu_in_idle(unsigned long pc
);
150 void arch_cpu_idle(void);
151 void arch_cpu_idle_prepare(void);
152 void arch_cpu_idle_enter(void);
153 void arch_cpu_idle_exit(void);
154 void arch_cpu_idle_dead(void);
156 int cpu_report_state(int cpu
);
157 int cpu_check_up_prepare(int cpu
);
158 void cpu_set_state_online(int cpu
);
159 void play_idle(unsigned long duration_ms
);
161 #ifdef CONFIG_HOTPLUG_CPU
162 bool cpu_wait_death(unsigned int cpu
, int seconds
);
163 bool cpu_report_death(void);
164 void cpuhp_report_idle_dead(void);
166 static inline void cpuhp_report_idle_dead(void) { }
167 #endif /* #ifdef CONFIG_HOTPLUG_CPU */
169 #endif /* _LINUX_CPU_H_ */