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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);
33
34extern int register_cpu(struct cpu *cpu, int num);
35extern struct device *get_cpu_device(unsigned cpu);
36extern bool cpu_is_hotpluggable(unsigned cpu);
37extern bool arch_match_cpu_phys_id(int cpu, u64 phys_id);
38extern bool arch_find_n_match_cpu_physical_id(struct device_node *cpun,
39 int cpu, unsigned int *thread);
40
41extern int cpu_add_dev_attr(struct device_attribute *attr);
42extern void cpu_remove_dev_attr(struct device_attribute *attr);
43
44extern int cpu_add_dev_attr_group(struct attribute_group *attrs);
45extern void cpu_remove_dev_attr_group(struct attribute_group *attrs);
46
47extern __printf(4, 5)
48struct device *cpu_device_create(struct device *parent, void *drvdata,
49 const struct attribute_group **groups,
50 const char *fmt, ...);
51#ifdef CONFIG_HOTPLUG_CPU
52extern void unregister_cpu(struct cpu *cpu);
53extern ssize_t arch_cpu_probe(const char *, size_t);
54extern ssize_t arch_cpu_release(const char *, size_t);
55#endif
56struct notifier_block;
57
58#define CPU_ONLINE 0x0002 /* CPU (unsigned)v is up */
59#define CPU_UP_PREPARE 0x0003 /* CPU (unsigned)v coming up */
60#define CPU_DEAD 0x0007 /* CPU (unsigned)v dead */
61#define CPU_POST_DEAD 0x0009 /* CPU (unsigned)v dead, cpu_hotplug
62 * lock is dropped */
63#define CPU_BROKEN 0x000B /* CPU (unsigned)v did not die properly,
64 * perhaps due to preemption. */
65
66/* Used for CPU hotplug events occurring while tasks are frozen due to a suspend
67 * operation in progress
68 */
69#define CPU_TASKS_FROZEN 0x0010
70
71#define CPU_ONLINE_FROZEN (CPU_ONLINE | CPU_TASKS_FROZEN)
72#define CPU_UP_PREPARE_FROZEN (CPU_UP_PREPARE | CPU_TASKS_FROZEN)
73#define CPU_UP_CANCELED_FROZEN (CPU_UP_CANCELED | CPU_TASKS_FROZEN)
74#define CPU_DOWN_PREPARE_FROZEN (CPU_DOWN_PREPARE | CPU_TASKS_FROZEN)
75#define CPU_DOWN_FAILED_FROZEN (CPU_DOWN_FAILED | CPU_TASKS_FROZEN)
76#define CPU_DEAD_FROZEN (CPU_DEAD | CPU_TASKS_FROZEN)
77
78#ifdef CONFIG_SMP
79extern bool cpuhp_tasks_frozen;
80int cpu_up(unsigned int cpu);
81void notify_cpu_starting(unsigned int cpu);
82extern void cpu_maps_update_begin(void);
83extern void cpu_maps_update_done(void);
84
85#else /* CONFIG_SMP */
86#define cpuhp_tasks_frozen 0
87
88static inline void cpu_maps_update_begin(void)
89{
90}
91
92static inline void cpu_maps_update_done(void)
93{
94}
95
96#endif /* CONFIG_SMP */
97extern struct bus_type cpu_subsys;
98
99#ifdef CONFIG_HOTPLUG_CPU
100/* Stop CPUs going up and down. */
101
102extern void cpu_hotplug_begin(void);
103extern void cpu_hotplug_done(void);
104extern void get_online_cpus(void);
105extern void put_online_cpus(void);
106extern void cpu_hotplug_disable(void);
107extern void cpu_hotplug_enable(void);
108void clear_tasks_mm_cpumask(int cpu);
109int cpu_down(unsigned int cpu);
110
111#else /* CONFIG_HOTPLUG_CPU */
112
113static inline void cpu_hotplug_begin(void) {}
114static inline void cpu_hotplug_done(void) {}
115#define get_online_cpus() do { } while (0)
116#define put_online_cpus() do { } while (0)
117#define cpu_hotplug_disable() do { } while (0)
118#define cpu_hotplug_enable() do { } while (0)
119#endif /* CONFIG_HOTPLUG_CPU */
120
121#ifdef CONFIG_PM_SLEEP_SMP
122extern int freeze_secondary_cpus(int primary);
123static inline int disable_nonboot_cpus(void)
124{
125 return freeze_secondary_cpus(0);
126}
127extern void enable_nonboot_cpus(void);
128#else /* !CONFIG_PM_SLEEP_SMP */
129static inline int disable_nonboot_cpus(void) { return 0; }
130static inline void enable_nonboot_cpus(void) {}
131#endif /* !CONFIG_PM_SLEEP_SMP */
132
133void cpu_startup_entry(enum cpuhp_state state);
134
135void cpu_idle_poll_ctrl(bool enable);
136
137/* Attach to any functions which should be considered cpuidle. */
138#define __cpuidle __attribute__((__section__(".cpuidle.text")))
139
140bool cpu_in_idle(unsigned long pc);
141
142void arch_cpu_idle(void);
143void arch_cpu_idle_prepare(void);
144void arch_cpu_idle_enter(void);
145void arch_cpu_idle_exit(void);
146void arch_cpu_idle_dead(void);
147
148int cpu_report_state(int cpu);
149int cpu_check_up_prepare(int cpu);
150void cpu_set_state_online(int cpu);
151void play_idle(unsigned long duration_ms);
152
153#ifdef CONFIG_HOTPLUG_CPU
154bool cpu_wait_death(unsigned int cpu, int seconds);
155bool cpu_report_death(void);
156void cpuhp_report_idle_dead(void);
157#else
158static inline void cpuhp_report_idle_dead(void) { }
159#endif /* #ifdef CONFIG_HOTPLUG_CPU */
160
161#endif /* _LINUX_CPU_H_ */