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1 /* SPDX-License-Identifier: GPL-2.0 */
3 * include/linux/cpu.h - generic cpu definition
5 * This is mainly for topological representation. We define the
6 * basic 'struct cpu' here, which can be embedded in per-arch
7 * definitions of processors.
9 * Basic handling of the devices is done in drivers/base/cpu.c
11 * CPUs are exported via sysfs in the devices/system/cpu
17 #include <linux/node.h>
18 #include <linux/compiler.h>
19 #include <linux/cpumask.h>
20 #include <linux/cpuhotplug.h>
24 struct attribute_group
;
27 int node_id
; /* The node which contains the CPU */
28 int hotpluggable
; /* creates sysfs control file if hotpluggable */
32 extern void boot_cpu_init(void);
33 extern void boot_cpu_state_init(void);
34 extern void cpu_init(void);
35 extern void trap_init(void);
37 extern int register_cpu(struct cpu
*cpu
, int num
);
38 extern struct device
*get_cpu_device(unsigned cpu
);
39 extern bool cpu_is_hotpluggable(unsigned cpu
);
40 extern bool arch_match_cpu_phys_id(int cpu
, u64 phys_id
);
41 extern bool arch_find_n_match_cpu_physical_id(struct device_node
*cpun
,
42 int cpu
, unsigned int *thread
);
44 extern int cpu_add_dev_attr(struct device_attribute
*attr
);
45 extern void cpu_remove_dev_attr(struct device_attribute
*attr
);
47 extern int cpu_add_dev_attr_group(struct attribute_group
*attrs
);
48 extern void cpu_remove_dev_attr_group(struct attribute_group
*attrs
);
50 extern ssize_t
cpu_show_meltdown(struct device
*dev
,
51 struct device_attribute
*attr
, char *buf
);
52 extern ssize_t
cpu_show_spectre_v1(struct device
*dev
,
53 struct device_attribute
*attr
, char *buf
);
54 extern ssize_t
cpu_show_spectre_v2(struct device
*dev
,
55 struct device_attribute
*attr
, char *buf
);
56 extern ssize_t
cpu_show_spec_store_bypass(struct device
*dev
,
57 struct device_attribute
*attr
, char *buf
);
60 struct device
*cpu_device_create(struct device
*parent
, void *drvdata
,
61 const struct attribute_group
**groups
,
62 const char *fmt
, ...);
63 #ifdef CONFIG_HOTPLUG_CPU
64 extern void unregister_cpu(struct cpu
*cpu
);
65 extern ssize_t
arch_cpu_probe(const char *, size_t);
66 extern ssize_t
arch_cpu_release(const char *, size_t);
70 * These states are not related to the core CPU hotplug mechanism. They are
71 * used by various (sub)architectures to track internal state
73 #define CPU_ONLINE 0x0002 /* CPU is up */
74 #define CPU_UP_PREPARE 0x0003 /* CPU coming up */
75 #define CPU_DEAD 0x0007 /* CPU dead */
76 #define CPU_DEAD_FROZEN 0x0008 /* CPU timed out on unplug */
77 #define CPU_POST_DEAD 0x0009 /* CPU successfully unplugged */
78 #define CPU_BROKEN 0x000B /* CPU did not die properly */
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_ */