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git.ipfire.org Git - thirdparty/kernel/stable.git/blob - include/linux/cpu.h
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
);
58 struct device
*cpu_device_create(struct device
*parent
, void *drvdata
,
59 const struct attribute_group
**groups
,
60 const char *fmt
, ...);
61 #ifdef CONFIG_HOTPLUG_CPU
62 extern void unregister_cpu(struct cpu
*cpu
);
63 extern ssize_t
arch_cpu_probe(const char *, size_t);
64 extern ssize_t
arch_cpu_release(const char *, size_t);
66 struct notifier_block
;
68 #define CPU_ONLINE 0x0002 /* CPU (unsigned)v is up */
69 #define CPU_UP_PREPARE 0x0003 /* CPU (unsigned)v coming up */
70 #define CPU_DEAD 0x0007 /* CPU (unsigned)v dead */
71 #define CPU_POST_DEAD 0x0009 /* CPU (unsigned)v dead, cpu_hotplug
73 #define CPU_BROKEN 0x000B /* CPU (unsigned)v did not die properly,
74 * perhaps due to preemption. */
76 /* Used for CPU hotplug events occurring while tasks are frozen due to a suspend
77 * operation in progress
79 #define CPU_TASKS_FROZEN 0x0010
81 #define CPU_ONLINE_FROZEN (CPU_ONLINE | CPU_TASKS_FROZEN)
82 #define CPU_UP_PREPARE_FROZEN (CPU_UP_PREPARE | CPU_TASKS_FROZEN)
83 #define CPU_UP_CANCELED_FROZEN (CPU_UP_CANCELED | CPU_TASKS_FROZEN)
84 #define CPU_DOWN_PREPARE_FROZEN (CPU_DOWN_PREPARE | CPU_TASKS_FROZEN)
85 #define CPU_DOWN_FAILED_FROZEN (CPU_DOWN_FAILED | CPU_TASKS_FROZEN)
86 #define CPU_DEAD_FROZEN (CPU_DEAD | CPU_TASKS_FROZEN)
89 extern bool cpuhp_tasks_frozen
;
90 int cpu_up(unsigned int cpu
);
91 void notify_cpu_starting(unsigned int cpu
);
92 extern void cpu_maps_update_begin(void);
93 extern void cpu_maps_update_done(void);
95 #else /* CONFIG_SMP */
96 #define cpuhp_tasks_frozen 0
98 static inline void cpu_maps_update_begin(void)
102 static inline void cpu_maps_update_done(void)
106 #endif /* CONFIG_SMP */
107 extern struct bus_type cpu_subsys
;
109 #ifdef CONFIG_HOTPLUG_CPU
110 extern void cpus_write_lock(void);
111 extern void cpus_write_unlock(void);
112 extern void cpus_read_lock(void);
113 extern void cpus_read_unlock(void);
114 extern void lockdep_assert_cpus_held(void);
115 extern void cpu_hotplug_disable(void);
116 extern void cpu_hotplug_enable(void);
117 void clear_tasks_mm_cpumask(int cpu
);
118 int cpu_down(unsigned int cpu
);
120 #else /* CONFIG_HOTPLUG_CPU */
122 static inline void cpus_write_lock(void) { }
123 static inline void cpus_write_unlock(void) { }
124 static inline void cpus_read_lock(void) { }
125 static inline void cpus_read_unlock(void) { }
126 static inline void lockdep_assert_cpus_held(void) { }
127 static inline void cpu_hotplug_disable(void) { }
128 static inline void cpu_hotplug_enable(void) { }
129 #endif /* !CONFIG_HOTPLUG_CPU */
131 /* Wrappers which go away once all code is converted */
132 static inline void cpu_hotplug_begin(void) { cpus_write_lock(); }
133 static inline void cpu_hotplug_done(void) { cpus_write_unlock(); }
134 static inline void get_online_cpus(void) { cpus_read_lock(); }
135 static inline void put_online_cpus(void) { cpus_read_unlock(); }
137 #ifdef CONFIG_PM_SLEEP_SMP
138 extern int freeze_secondary_cpus(int primary
);
139 static inline int disable_nonboot_cpus(void)
141 return freeze_secondary_cpus(0);
143 extern void enable_nonboot_cpus(void);
144 #else /* !CONFIG_PM_SLEEP_SMP */
145 static inline int disable_nonboot_cpus(void) { return 0; }
146 static inline void enable_nonboot_cpus(void) {}
147 #endif /* !CONFIG_PM_SLEEP_SMP */
149 void cpu_startup_entry(enum cpuhp_state state
);
151 void cpu_idle_poll_ctrl(bool enable
);
153 /* Attach to any functions which should be considered cpuidle. */
154 #define __cpuidle __attribute__((__section__(".cpuidle.text")))
156 bool cpu_in_idle(unsigned long pc
);
158 void arch_cpu_idle(void);
159 void arch_cpu_idle_prepare(void);
160 void arch_cpu_idle_enter(void);
161 void arch_cpu_idle_exit(void);
162 void arch_cpu_idle_dead(void);
164 int cpu_report_state(int cpu
);
165 int cpu_check_up_prepare(int cpu
);
166 void cpu_set_state_online(int cpu
);
167 void play_idle(unsigned long duration_ms
);
169 #ifdef CONFIG_HOTPLUG_CPU
170 bool cpu_wait_death(unsigned int cpu
, int seconds
);
171 bool cpu_report_death(void);
172 void cpuhp_report_idle_dead(void);
174 static inline void cpuhp_report_idle_dead(void) { }
175 #endif /* #ifdef CONFIG_HOTPLUG_CPU */
177 #endif /* _LINUX_CPU_H_ */