301 lines
9.5 KiB
C
301 lines
9.5 KiB
C
/*
|
|
* 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 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 ssize_t cpu_show_tsx_async_abort(struct device *dev,
|
|
struct device_attribute *attr,
|
|
char *buf);
|
|
extern ssize_t cpu_show_itlb_multihit(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
|
|
struct notifier_block;
|
|
|
|
#define CPU_ONLINE 0x0002 /* CPU (unsigned)v is up */
|
|
#define CPU_UP_PREPARE 0x0003 /* CPU (unsigned)v coming up */
|
|
#define CPU_UP_CANCELED 0x0004 /* CPU (unsigned)v NOT coming up */
|
|
#define CPU_DOWN_PREPARE 0x0005 /* CPU (unsigned)v going down */
|
|
#define CPU_DOWN_FAILED 0x0006 /* CPU (unsigned)v NOT going down */
|
|
#define CPU_DEAD 0x0007 /* CPU (unsigned)v dead */
|
|
#define CPU_POST_DEAD 0x0009 /* CPU (unsigned)v dead, cpu_hotplug
|
|
* lock is dropped */
|
|
#define CPU_BROKEN 0x000B /* CPU (unsigned)v did not die properly,
|
|
* perhaps due to preemption. */
|
|
|
|
/* Used for CPU hotplug events occurring while tasks are frozen due to a suspend
|
|
* operation in progress
|
|
*/
|
|
#define CPU_TASKS_FROZEN 0x0010
|
|
|
|
#define CPU_ONLINE_FROZEN (CPU_ONLINE | CPU_TASKS_FROZEN)
|
|
#define CPU_UP_PREPARE_FROZEN (CPU_UP_PREPARE | CPU_TASKS_FROZEN)
|
|
#define CPU_UP_CANCELED_FROZEN (CPU_UP_CANCELED | CPU_TASKS_FROZEN)
|
|
#define CPU_DOWN_PREPARE_FROZEN (CPU_DOWN_PREPARE | CPU_TASKS_FROZEN)
|
|
#define CPU_DOWN_FAILED_FROZEN (CPU_DOWN_FAILED | CPU_TASKS_FROZEN)
|
|
#define CPU_DEAD_FROZEN (CPU_DEAD | CPU_TASKS_FROZEN)
|
|
|
|
#ifdef CONFIG_SMP
|
|
extern bool cpuhp_tasks_frozen;
|
|
/* Need to know about CPUs going up/down? */
|
|
#if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE)
|
|
#define cpu_notifier(fn, pri) { \
|
|
static struct notifier_block fn##_nb = \
|
|
{ .notifier_call = fn, .priority = pri }; \
|
|
register_cpu_notifier(&fn##_nb); \
|
|
}
|
|
|
|
#define __cpu_notifier(fn, pri) { \
|
|
static struct notifier_block fn##_nb = \
|
|
{ .notifier_call = fn, .priority = pri }; \
|
|
__register_cpu_notifier(&fn##_nb); \
|
|
}
|
|
|
|
extern int register_cpu_notifier(struct notifier_block *nb);
|
|
extern int __register_cpu_notifier(struct notifier_block *nb);
|
|
extern void unregister_cpu_notifier(struct notifier_block *nb);
|
|
extern void __unregister_cpu_notifier(struct notifier_block *nb);
|
|
|
|
#else /* #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
|
|
#define cpu_notifier(fn, pri) do { (void)(fn); } while (0)
|
|
#define __cpu_notifier(fn, pri) do { (void)(fn); } while (0)
|
|
|
|
static inline int register_cpu_notifier(struct notifier_block *nb)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline int __register_cpu_notifier(struct notifier_block *nb)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void unregister_cpu_notifier(struct notifier_block *nb)
|
|
{
|
|
}
|
|
|
|
static inline void __unregister_cpu_notifier(struct notifier_block *nb)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
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);
|
|
|
|
#define cpu_notifier_register_begin cpu_maps_update_begin
|
|
#define cpu_notifier_register_done cpu_maps_update_done
|
|
|
|
#else /* CONFIG_SMP */
|
|
#define cpuhp_tasks_frozen 0
|
|
|
|
#define cpu_notifier(fn, pri) do { (void)(fn); } while (0)
|
|
#define __cpu_notifier(fn, pri) do { (void)(fn); } while (0)
|
|
|
|
static inline int register_cpu_notifier(struct notifier_block *nb)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline int __register_cpu_notifier(struct notifier_block *nb)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void unregister_cpu_notifier(struct notifier_block *nb)
|
|
{
|
|
}
|
|
|
|
static inline void __unregister_cpu_notifier(struct notifier_block *nb)
|
|
{
|
|
}
|
|
|
|
static inline void cpu_maps_update_begin(void)
|
|
{
|
|
}
|
|
|
|
static inline void cpu_maps_update_done(void)
|
|
{
|
|
}
|
|
|
|
static inline void cpu_notifier_register_begin(void)
|
|
{
|
|
}
|
|
|
|
static inline void cpu_notifier_register_done(void)
|
|
{
|
|
}
|
|
|
|
#endif /* CONFIG_SMP */
|
|
extern struct bus_type cpu_subsys;
|
|
|
|
#ifdef CONFIG_HOTPLUG_CPU
|
|
/* Stop CPUs going up and down. */
|
|
|
|
extern void cpu_hotplug_begin(void);
|
|
extern void cpu_hotplug_done(void);
|
|
extern void get_online_cpus(void);
|
|
extern void put_online_cpus(void);
|
|
extern void cpu_hotplug_disable(void);
|
|
extern void cpu_hotplug_enable(void);
|
|
#define hotcpu_notifier(fn, pri) cpu_notifier(fn, pri)
|
|
#define __hotcpu_notifier(fn, pri) __cpu_notifier(fn, pri)
|
|
#define register_hotcpu_notifier(nb) register_cpu_notifier(nb)
|
|
#define __register_hotcpu_notifier(nb) __register_cpu_notifier(nb)
|
|
#define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb)
|
|
#define __unregister_hotcpu_notifier(nb) __unregister_cpu_notifier(nb)
|
|
void clear_tasks_mm_cpumask(int cpu);
|
|
int cpu_down(unsigned int cpu);
|
|
|
|
#else /* CONFIG_HOTPLUG_CPU */
|
|
|
|
static inline void cpu_hotplug_begin(void) {}
|
|
static inline void cpu_hotplug_done(void) {}
|
|
#define get_online_cpus() do { } while (0)
|
|
#define put_online_cpus() do { } while (0)
|
|
#define cpu_hotplug_disable() do { } while (0)
|
|
#define cpu_hotplug_enable() do { } while (0)
|
|
#define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0)
|
|
#define __hotcpu_notifier(fn, pri) do { (void)(fn); } while (0)
|
|
/* These aren't inline functions due to a GCC bug. */
|
|
#define register_hotcpu_notifier(nb) ({ (void)(nb); 0; })
|
|
#define __register_hotcpu_notifier(nb) ({ (void)(nb); 0; })
|
|
#define unregister_hotcpu_notifier(nb) ({ (void)(nb); })
|
|
#define __unregister_hotcpu_notifier(nb) ({ (void)(nb); })
|
|
#endif /* CONFIG_HOTPLUG_CPU */
|
|
|
|
#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);
|
|
#else /* !CONFIG_PM_SLEEP_SMP */
|
|
static inline int disable_nonboot_cpus(void) { return 0; }
|
|
static inline void enable_nonboot_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);
|
|
#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,
|
|
};
|
|
|
|
#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_early(void);
|
|
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_ENABLED)
|
|
static inline void cpu_smt_disable(bool force) { }
|
|
static inline void cpu_smt_check_topology_early(void) { }
|
|
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
|
|
|
|
extern bool cpu_mitigations_off(void);
|
|
extern bool cpu_mitigations_auto_nosmt(void);
|
|
|
|
#define IDLE_START 1
|
|
#define IDLE_END 2
|
|
|
|
void idle_notifier_register(struct notifier_block *n);
|
|
void idle_notifier_unregister(struct notifier_block *n);
|
|
void idle_notifier_call_chain(unsigned long val);
|
|
|
|
#endif /* _LINUX_CPU_H_ */
|