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1/*
2 * include/linux/cpu.h - generic cpu definition
3 *
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.
7 *
8 * Basic handling of the devices is done in drivers/base/cpu.c
9 *
10 * CPUs are exported via sysfs in the devices/system/cpu
11 * directory.
12 */
13#ifndef _LINUX_CPU_H_
14#define _LINUX_CPU_H_
15
16#include <linux/node.h>
17#include <linux/compiler.h>
18#include <linux/cpumask.h>
19#include <linux/cpuhotplug.h>
20
21struct device;
22struct device_node;
23struct attribute_group;
24
25struct cpu {
26 int node_id; /* The node which contains the CPU */
27 int hotpluggable; /* creates sysfs control file if hotpluggable */
28 struct device dev;
29};
30
31extern void boot_cpu_init(void);
32extern void boot_cpu_state_init(void);
33extern void cpu_init(void);
34extern void trap_init(void);
35
36extern int register_cpu(struct cpu *cpu, int num);
37extern struct device *get_cpu_device(unsigned cpu);
38extern bool cpu_is_hotpluggable(unsigned cpu);
39extern bool arch_match_cpu_phys_id(int cpu, u64 phys_id);
40extern bool arch_find_n_match_cpu_physical_id(struct device_node *cpun,
41 int cpu, unsigned int *thread);
42
43extern int cpu_add_dev_attr(struct device_attribute *attr);
44extern void cpu_remove_dev_attr(struct device_attribute *attr);
45
46extern int cpu_add_dev_attr_group(struct attribute_group *attrs);
47extern void cpu_remove_dev_attr_group(struct attribute_group *attrs);
48
49extern __printf(4, 5)
50struct device *cpu_device_create(struct device *parent, void *drvdata,
51 const struct attribute_group **groups,
52 const char *fmt, ...);
53#ifdef CONFIG_HOTPLUG_CPU
54extern void unregister_cpu(struct cpu *cpu);
55extern ssize_t arch_cpu_probe(const char *, size_t);
56extern ssize_t arch_cpu_release(const char *, size_t);
57#endif
58struct notifier_block;
59
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
64 * lock is dropped */
65#define CPU_BROKEN 0x000B /* CPU (unsigned)v did not die properly,
66 * perhaps due to preemption. */
67
68/* Used for CPU hotplug events occurring while tasks are frozen due to a suspend
69 * operation in progress
70 */
71#define CPU_TASKS_FROZEN 0x0010
72
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)
79
80#ifdef CONFIG_SMP
81extern bool cpuhp_tasks_frozen;
82int cpu_up(unsigned int cpu);
83void notify_cpu_starting(unsigned int cpu);
84extern void cpu_maps_update_begin(void);
85extern void cpu_maps_update_done(void);
86
87#else /* CONFIG_SMP */
88#define cpuhp_tasks_frozen 0
89
90static inline void cpu_maps_update_begin(void)
91{
92}
93
94static inline void cpu_maps_update_done(void)
95{
96}
97
98#endif /* CONFIG_SMP */
99extern struct bus_type cpu_subsys;
100
101#ifdef CONFIG_HOTPLUG_CPU
102/* Stop CPUs going up and down. */
103
104extern void cpu_hotplug_begin(void);
105extern void cpu_hotplug_done(void);
106extern void get_online_cpus(void);
107extern void put_online_cpus(void);
108extern void cpu_hotplug_disable(void);
109extern void cpu_hotplug_enable(void);
110void clear_tasks_mm_cpumask(int cpu);
111int cpu_down(unsigned int cpu);
112
113#else /* CONFIG_HOTPLUG_CPU */
114
115static inline void cpu_hotplug_begin(void) {}
116static inline void cpu_hotplug_done(void) {}
117#define get_online_cpus() do { } while (0)
118#define put_online_cpus() do { } while (0)
119#define cpu_hotplug_disable() do { } while (0)
120#define cpu_hotplug_enable() do { } while (0)
121#endif /* CONFIG_HOTPLUG_CPU */
122
123#ifdef CONFIG_PM_SLEEP_SMP
124extern int freeze_secondary_cpus(int primary);
125static inline int disable_nonboot_cpus(void)
126{
127 return freeze_secondary_cpus(0);
128}
129extern void enable_nonboot_cpus(void);
130#else /* !CONFIG_PM_SLEEP_SMP */
131static inline int disable_nonboot_cpus(void) { return 0; }
132static inline void enable_nonboot_cpus(void) {}
133#endif /* !CONFIG_PM_SLEEP_SMP */
134
135void cpu_startup_entry(enum cpuhp_state state);
136
137void cpu_idle_poll_ctrl(bool enable);
138
139/* Attach to any functions which should be considered cpuidle. */
140#define __cpuidle __attribute__((__section__(".cpuidle.text")))
141
142bool cpu_in_idle(unsigned long pc);
143
144void arch_cpu_idle(void);
145void arch_cpu_idle_prepare(void);
146void arch_cpu_idle_enter(void);
147void arch_cpu_idle_exit(void);
148void arch_cpu_idle_dead(void);
149
150int cpu_report_state(int cpu);
151int cpu_check_up_prepare(int cpu);
152void cpu_set_state_online(int cpu);
153void play_idle(unsigned long duration_ms);
154
155#ifdef CONFIG_HOTPLUG_CPU
156bool cpu_wait_death(unsigned int cpu, int seconds);
157bool cpu_report_death(void);
158void cpuhp_report_idle_dead(void);
159#else
160static inline void cpuhp_report_idle_dead(void) { }
161#endif /* #ifdef CONFIG_HOTPLUG_CPU */
162
163#endif /* _LINUX_CPU_H_ */