cpu.h 6.6 KB
Newer Older
1
/* SPDX-License-Identifier: GPL-2.0 */
L
Linus Torvalds 已提交
2 3 4 5 6 7 8 9 10
/*
 * include/linux/cpu.h - generic cpu definition
 *
 * This is mainly for topological representation. We define the 
 * basic 'struct cpu' here, which can be embedded in per-arch 
 * definitions of processors.
 *
 * Basic handling of the devices is done in drivers/base/cpu.c
 *
11
 * CPUs are exported via sysfs in the devices/system/cpu
L
Linus Torvalds 已提交
12 13 14 15 16 17 18 19
 * directory. 
 */
#ifndef _LINUX_CPU_H_
#define _LINUX_CPU_H_

#include <linux/node.h>
#include <linux/compiler.h>
#include <linux/cpumask.h>
20
#include <linux/cpuhotplug.h>
L
Linus Torvalds 已提交
21

22
struct device;
23
struct device_node;
24
struct attribute_group;
25

L
Linus Torvalds 已提交
26 27
struct cpu {
	int node_id;		/* The node which contains the CPU */
28
	int hotpluggable;	/* creates sysfs control file if hotpluggable */
29
	struct device dev;
L
Linus Torvalds 已提交
30 31
};

32
extern void boot_cpu_init(void);
33
extern void boot_cpu_hotplug_init(void);
34 35
extern void cpu_init(void);
extern void trap_init(void);
36

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 42
extern bool arch_find_n_match_cpu_physical_id(struct device_node *cpun,
					      int cpu, unsigned int *thread);
43

44 45
extern int cpu_add_dev_attr(struct device_attribute *attr);
extern void cpu_remove_dev_attr(struct device_attribute *attr);
46

47 48
extern int cpu_add_dev_attr_group(struct attribute_group *attrs);
extern void cpu_remove_dev_attr_group(struct attribute_group *attrs);
49

50 51 52 53 54 55
extern ssize_t cpu_show_meltdown(struct device *dev,
				 struct device_attribute *attr, char *buf);
extern ssize_t cpu_show_spectre_v1(struct device *dev,
				   struct device_attribute *attr, char *buf);
extern ssize_t cpu_show_spectre_v2(struct device *dev,
				   struct device_attribute *attr, char *buf);
56 57
extern ssize_t cpu_show_spec_store_bypass(struct device *dev,
					  struct device_attribute *attr, char *buf);
58 59
extern ssize_t cpu_show_l1tf(struct device *dev,
			     struct device_attribute *attr, char *buf);
60 61
extern ssize_t cpu_show_mds(struct device *dev,
			    struct device_attribute *attr, char *buf);
62 63 64
extern ssize_t cpu_show_tsx_async_abort(struct device *dev,
					struct device_attribute *attr,
					char *buf);
65 66
extern ssize_t cpu_show_itlb_multihit(struct device *dev,
				      struct device_attribute *attr, char *buf);
67

68 69 70 71
extern __printf(4, 5)
struct device *cpu_device_create(struct device *parent, void *drvdata,
				 const struct attribute_group **groups,
				 const char *fmt, ...);
L
Linus Torvalds 已提交
72
#ifdef CONFIG_HOTPLUG_CPU
73
extern void unregister_cpu(struct cpu *cpu);
74 75
extern ssize_t arch_cpu_probe(const char *, size_t);
extern ssize_t arch_cpu_release(const char *, size_t);
L
Linus Torvalds 已提交
76 77
#endif

78 79 80
/*
 * These states are not related to the core CPU hotplug mechanism. They are
 * used by various (sub)architectures to track internal state
81
 */
82 83 84 85 86 87
#define CPU_ONLINE		0x0002 /* CPU is up */
#define CPU_UP_PREPARE		0x0003 /* CPU coming up */
#define CPU_DEAD		0x0007 /* CPU dead */
#define CPU_DEAD_FROZEN		0x0008 /* CPU timed out on unplug */
#define CPU_POST_DEAD		0x0009 /* CPU successfully unplugged */
#define CPU_BROKEN		0x000B /* CPU did not die properly */
88

L
Linus Torvalds 已提交
89
#ifdef CONFIG_SMP
90
extern bool cpuhp_tasks_frozen;
L
Linus Torvalds 已提交
91
int cpu_up(unsigned int cpu);
92
void notify_cpu_starting(unsigned int cpu);
93 94
extern void cpu_maps_update_begin(void);
extern void cpu_maps_update_done(void);
95

96
#else	/* CONFIG_SMP */
97
#define cpuhp_tasks_frozen	0
L
Linus Torvalds 已提交
98

99 100 101 102 103 104 105 106
static inline void cpu_maps_update_begin(void)
{
}

static inline void cpu_maps_update_done(void)
{
}

L
Linus Torvalds 已提交
107
#endif /* CONFIG_SMP */
108
extern struct bus_type cpu_subsys;
L
Linus Torvalds 已提交
109 110

#ifdef CONFIG_HOTPLUG_CPU
111 112 113 114
extern void cpus_write_lock(void);
extern void cpus_write_unlock(void);
extern void cpus_read_lock(void);
extern void cpus_read_unlock(void);
115
extern int  cpus_read_trylock(void);
116
extern void lockdep_assert_cpus_held(void);
117 118
extern void cpu_hotplug_disable(void);
extern void cpu_hotplug_enable(void);
119
void clear_tasks_mm_cpumask(int cpu);
L
Linus Torvalds 已提交
120
int cpu_down(unsigned int cpu);
121

122 123 124 125 126 127
#else /* CONFIG_HOTPLUG_CPU */

static inline void cpus_write_lock(void) { }
static inline void cpus_write_unlock(void) { }
static inline void cpus_read_lock(void) { }
static inline void cpus_read_unlock(void) { }
128
static inline int  cpus_read_trylock(void) { return true; }
129
static inline void lockdep_assert_cpus_held(void) { }
130 131 132 133 134 135 136 137 138
static inline void cpu_hotplug_disable(void) { }
static inline void cpu_hotplug_enable(void) { }
#endif	/* !CONFIG_HOTPLUG_CPU */

/* Wrappers which go away once all code is converted */
static inline void cpu_hotplug_begin(void) { cpus_write_lock(); }
static inline void cpu_hotplug_done(void) { cpus_write_unlock(); }
static inline void get_online_cpus(void) { cpus_read_lock(); }
static inline void put_online_cpus(void) { cpus_read_unlock(); }
L
Linus Torvalds 已提交
139

140
#ifdef CONFIG_PM_SLEEP_SMP
141 142 143 144 145
extern int freeze_secondary_cpus(int primary);
static inline int disable_nonboot_cpus(void)
{
	return freeze_secondary_cpus(0);
}
146
extern void enable_nonboot_cpus(void);
147
#else /* !CONFIG_PM_SLEEP_SMP */
148 149
static inline int disable_nonboot_cpus(void) { return 0; }
static inline void enable_nonboot_cpus(void) {}
150
#endif /* !CONFIG_PM_SLEEP_SMP */
151

152 153
void cpu_startup_entry(enum cpuhp_state state);

154 155
void cpu_idle_poll_ctrl(bool enable);

156 157 158 159 160
/* Attach to any functions which should be considered cpuidle. */
#define __cpuidle	__attribute__((__section__(".cpuidle.text")))

bool cpu_in_idle(unsigned long pc);

161 162 163 164 165 166
void arch_cpu_idle(void);
void arch_cpu_idle_prepare(void);
void arch_cpu_idle_enter(void);
void arch_cpu_idle_exit(void);
void arch_cpu_idle_dead(void);

167 168 169
int cpu_report_state(int cpu);
int cpu_check_up_prepare(int cpu);
void cpu_set_state_online(int cpu);
170 171
void play_idle(unsigned long duration_ms);

172 173 174
#ifdef CONFIG_HOTPLUG_CPU
bool cpu_wait_death(unsigned int cpu, int seconds);
bool cpu_report_death(void);
175 176 177
void cpuhp_report_idle_dead(void);
#else
static inline void cpuhp_report_idle_dead(void) { }
178 179
#endif /* #ifdef CONFIG_HOTPLUG_CPU */

180 181 182 183 184 185 186 187 188
enum cpuhp_smt_control {
	CPU_SMT_ENABLED,
	CPU_SMT_DISABLED,
	CPU_SMT_FORCE_DISABLED,
	CPU_SMT_NOT_SUPPORTED,
};

#if defined(CONFIG_SMP) && defined(CONFIG_HOTPLUG_SMT)
extern enum cpuhp_smt_control cpu_smt_control;
189
extern void cpu_smt_disable(bool force);
190
extern void cpu_smt_check_topology(void);
191 192
extern int cpuhp_smt_enable(void);
extern int cpuhp_smt_disable(enum cpuhp_smt_control ctrlval);
193 194
#else
# define cpu_smt_control		(CPU_SMT_ENABLED)
195
static inline void cpu_smt_disable(bool force) { }
196
static inline void cpu_smt_check_topology(void) { }
197 198
static inline int cpuhp_smt_enable(void) { return 0; }
static inline int cpuhp_smt_disable(enum cpuhp_smt_control ctrlval) { return 0; }
199 200
#endif

201 202
extern bool cpu_mitigations_off(void);
extern bool cpu_mitigations_auto_nosmt(void);
203

L
Linus Torvalds 已提交
204
#endif /* _LINUX_CPU_H_ */