239 строки
7.2 KiB
C
239 строки
7.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* 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
|
|
*
|
|
* CPUs are exported via sysfs in the devices/system/cpu
|
|
* directory.
|
|
*/
|
|
#ifndef _LINUX_CPU_H_
|
|
#define _LINUX_CPU_H_
|
|
|
|
#include <linux/node.h>
|
|
#include <linux/compiler.h>
|
|
#include <linux/cpumask.h>
|
|
#include <linux/cpuhotplug.h>
|
|
|
|
struct device;
|
|
struct device_node;
|
|
struct attribute_group;
|
|
|
|
struct cpu {
|
|
int node_id; /* The node which contains the CPU */
|
|
int hotpluggable; /* creates sysfs control file if hotpluggable */
|
|
struct device dev;
|
|
};
|
|
|
|
extern void boot_cpu_init(void);
|
|
extern void boot_cpu_hotplug_init(void);
|
|
extern void cpu_init(void);
|
|
extern void trap_init(void);
|
|
|
|
extern int register_cpu(struct cpu *cpu, int num);
|
|
extern struct device *get_cpu_device(unsigned cpu);
|
|
extern bool cpu_is_hotpluggable(unsigned cpu);
|
|
extern bool arch_match_cpu_phys_id(int cpu, u64 phys_id);
|
|
extern bool arch_find_n_match_cpu_physical_id(struct device_node *cpun,
|
|
int cpu, unsigned int *thread);
|
|
|
|
extern int cpu_add_dev_attr(struct device_attribute *attr);
|
|
extern void cpu_remove_dev_attr(struct device_attribute *attr);
|
|
|
|
extern int cpu_add_dev_attr_group(struct attribute_group *attrs);
|
|
extern void cpu_remove_dev_attr_group(struct attribute_group *attrs);
|
|
|
|
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);
|
|
extern ssize_t cpu_show_spec_store_bypass(struct device *dev,
|
|
struct device_attribute *attr, char *buf);
|
|
extern ssize_t cpu_show_l1tf(struct device *dev,
|
|
struct device_attribute *attr, char *buf);
|
|
extern ssize_t cpu_show_mds(struct device *dev,
|
|
struct device_attribute *attr, char *buf);
|
|
|
|
extern __printf(4, 5)
|
|
struct device *cpu_device_create(struct device *parent, void *drvdata,
|
|
const struct attribute_group **groups,
|
|
const char *fmt, ...);
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
extern void unregister_cpu(struct cpu *cpu);
|
|
extern ssize_t arch_cpu_probe(const char *, size_t);
|
|
extern ssize_t arch_cpu_release(const char *, size_t);
|
|
#endif
|
|
|
|
/*
|
|
* These states are not related to the core CPU hotplug mechanism. They are
|
|
* used by various (sub)architectures to track internal state
|
|
*/
|
|
#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 */
|
|
|
|
#ifdef CONFIG_SMP
|
|
extern bool cpuhp_tasks_frozen;
|
|
int cpu_up(unsigned int cpu);
|
|
void notify_cpu_starting(unsigned int cpu);
|
|
extern void cpu_maps_update_begin(void);
|
|
extern void cpu_maps_update_done(void);
|
|
|
|
#else /* CONFIG_SMP */
|
|
#define cpuhp_tasks_frozen 0
|
|
|
|
static inline void cpu_maps_update_begin(void)
|
|
{
|
|
}
|
|
|
|
static inline void cpu_maps_update_done(void)
|
|
{
|
|
}
|
|
|
|
#endif /* CONFIG_SMP */
|
|
extern struct bus_type cpu_subsys;
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
extern void cpus_write_lock(void);
|
|
extern void cpus_write_unlock(void);
|
|
extern void cpus_read_lock(void);
|
|
extern void cpus_read_unlock(void);
|
|
extern int cpus_read_trylock(void);
|
|
extern void lockdep_assert_cpus_held(void);
|
|
extern void cpu_hotplug_disable(void);
|
|
extern void cpu_hotplug_enable(void);
|
|
void clear_tasks_mm_cpumask(int cpu);
|
|
int cpu_down(unsigned int cpu);
|
|
|
|
#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) { }
|
|
static inline int cpus_read_trylock(void) { return true; }
|
|
static inline void lockdep_assert_cpus_held(void) { }
|
|
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(); }
|
|
|
|
#ifdef CONFIG_PM_SLEEP_SMP
|
|
extern int freeze_secondary_cpus(int primary);
|
|
static inline int disable_nonboot_cpus(void)
|
|
{
|
|
return freeze_secondary_cpus(0);
|
|
}
|
|
extern void enable_nonboot_cpus(void);
|
|
|
|
static inline int suspend_disable_secondary_cpus(void)
|
|
{
|
|
int cpu = 0;
|
|
|
|
if (IS_ENABLED(CONFIG_PM_SLEEP_SMP_NONZERO_CPU))
|
|
cpu = -1;
|
|
|
|
return freeze_secondary_cpus(cpu);
|
|
}
|
|
static inline void suspend_enable_secondary_cpus(void)
|
|
{
|
|
return enable_nonboot_cpus();
|
|
}
|
|
|
|
#else /* !CONFIG_PM_SLEEP_SMP */
|
|
static inline int disable_nonboot_cpus(void) { return 0; }
|
|
static inline void enable_nonboot_cpus(void) {}
|
|
static inline int suspend_disable_secondary_cpus(void) { return 0; }
|
|
static inline void suspend_enable_secondary_cpus(void) { }
|
|
#endif /* !CONFIG_PM_SLEEP_SMP */
|
|
|
|
void cpu_startup_entry(enum cpuhp_state state);
|
|
|
|
void cpu_idle_poll_ctrl(bool enable);
|
|
|
|
/* Attach to any functions which should be considered cpuidle. */
|
|
#define __cpuidle __attribute__((__section__(".cpuidle.text")))
|
|
|
|
bool cpu_in_idle(unsigned long pc);
|
|
|
|
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);
|
|
|
|
int cpu_report_state(int cpu);
|
|
int cpu_check_up_prepare(int cpu);
|
|
void cpu_set_state_online(int cpu);
|
|
void play_idle(unsigned long duration_ms);
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
bool cpu_wait_death(unsigned int cpu, int seconds);
|
|
bool cpu_report_death(void);
|
|
void cpuhp_report_idle_dead(void);
|
|
#else
|
|
static inline void cpuhp_report_idle_dead(void) { }
|
|
#endif /* #ifdef CONFIG_HOTPLUG_CPU */
|
|
|
|
enum cpuhp_smt_control {
|
|
CPU_SMT_ENABLED,
|
|
CPU_SMT_DISABLED,
|
|
CPU_SMT_FORCE_DISABLED,
|
|
CPU_SMT_NOT_SUPPORTED,
|
|
CPU_SMT_NOT_IMPLEMENTED,
|
|
};
|
|
|
|
#if defined(CONFIG_SMP) && defined(CONFIG_HOTPLUG_SMT)
|
|
extern enum cpuhp_smt_control cpu_smt_control;
|
|
extern void cpu_smt_disable(bool force);
|
|
extern void cpu_smt_check_topology(void);
|
|
extern int cpuhp_smt_enable(void);
|
|
extern int cpuhp_smt_disable(enum cpuhp_smt_control ctrlval);
|
|
#else
|
|
# define cpu_smt_control (CPU_SMT_NOT_IMPLEMENTED)
|
|
static inline void cpu_smt_disable(bool force) { }
|
|
static inline void cpu_smt_check_topology(void) { }
|
|
static inline int cpuhp_smt_enable(void) { return 0; }
|
|
static inline int cpuhp_smt_disable(enum cpuhp_smt_control ctrlval) { return 0; }
|
|
#endif
|
|
|
|
/*
|
|
* These are used for a global "mitigations=" cmdline option for toggling
|
|
* optional CPU mitigations.
|
|
*/
|
|
enum cpu_mitigations {
|
|
CPU_MITIGATIONS_OFF,
|
|
CPU_MITIGATIONS_AUTO,
|
|
CPU_MITIGATIONS_AUTO_NOSMT,
|
|
};
|
|
|
|
extern enum cpu_mitigations cpu_mitigations;
|
|
|
|
/* mitigations=off */
|
|
static inline bool cpu_mitigations_off(void)
|
|
{
|
|
return cpu_mitigations == CPU_MITIGATIONS_OFF;
|
|
}
|
|
|
|
/* mitigations=auto,nosmt */
|
|
static inline bool cpu_mitigations_auto_nosmt(void)
|
|
{
|
|
return cpu_mitigations == CPU_MITIGATIONS_AUTO_NOSMT;
|
|
}
|
|
|
|
#endif /* _LINUX_CPU_H_ */
|