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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
102extern void cpus_write_lock(void);
103extern void cpus_write_unlock(void);
104extern void cpus_read_lock(void);
105extern void cpus_read_unlock(void);
106extern void lockdep_assert_cpus_held(void);
107extern void cpu_hotplug_disable(void);
108extern void cpu_hotplug_enable(void);
109void clear_tasks_mm_cpumask(int cpu);
110int cpu_down(unsigned int cpu);
111
112#else /* CONFIG_HOTPLUG_CPU */
113
114static inline void cpus_write_lock(void) { }
115static inline void cpus_write_unlock(void) { }
116static inline void cpus_read_lock(void) { }
117static inline void cpus_read_unlock(void) { }
118static inline void lockdep_assert_cpus_held(void) { }
119static inline void cpu_hotplug_disable(void) { }
120static inline void cpu_hotplug_enable(void) { }
121#endif /* !CONFIG_HOTPLUG_CPU */
122
123/* Wrappers which go away once all code is converted */
124static inline void cpu_hotplug_begin(void) { cpus_write_lock(); }
125static inline void cpu_hotplug_done(void) { cpus_write_unlock(); }
126static inline void get_online_cpus(void) { cpus_read_lock(); }
127static inline void put_online_cpus(void) { cpus_read_unlock(); }
128
129#ifdef CONFIG_PM_SLEEP_SMP
130extern int freeze_secondary_cpus(int primary);
131static inline int disable_nonboot_cpus(void)
132{
133 return freeze_secondary_cpus(0);
134}
135extern void enable_nonboot_cpus(void);
136#else /* !CONFIG_PM_SLEEP_SMP */
137static inline int disable_nonboot_cpus(void) { return 0; }
138static inline void enable_nonboot_cpus(void) {}
139#endif /* !CONFIG_PM_SLEEP_SMP */
140
141void cpu_startup_entry(enum cpuhp_state state);
142
143void cpu_idle_poll_ctrl(bool enable);
144
145/* Attach to any functions which should be considered cpuidle. */
146#define __cpuidle __attribute__((__section__(".cpuidle.text")))
147
148bool cpu_in_idle(unsigned long pc);
149
150void arch_cpu_idle(void);
151void arch_cpu_idle_prepare(void);
152void arch_cpu_idle_enter(void);
153void arch_cpu_idle_exit(void);
154void arch_cpu_idle_dead(void);
155
156int cpu_report_state(int cpu);
157int cpu_check_up_prepare(int cpu);
158void cpu_set_state_online(int cpu);
159void play_idle(unsigned long duration_ms);
160
161#ifdef CONFIG_HOTPLUG_CPU
162bool cpu_wait_death(unsigned int cpu, int seconds);
163bool cpu_report_death(void);
164void cpuhp_report_idle_dead(void);
165#else
166static inline void cpuhp_report_idle_dead(void) { }
167#endif /* #ifdef CONFIG_HOTPLUG_CPU */
168
169#endif /* _LINUX_CPU_H_ */