cpu.h 7.91 KB
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/*
 * 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
 *
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 * CPUs are exported via sysfs in the devices/system/cpu
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 * directory. 
 */
#ifndef _LINUX_CPU_H_
#define _LINUX_CPU_H_

#include <linux/node.h>
#include <linux/compiler.h>
#include <linux/cpumask.h>
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#include <linux/cpuhotplug.h>
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struct device;
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struct device_node;
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struct attribute_group;
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struct cpu {
	int node_id;		/* The node which contains the CPU */
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	int hotpluggable;	/* creates sysfs control file if hotpluggable */
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	struct device dev;
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};

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extern void boot_cpu_init(void);
extern void boot_cpu_state_init(void);

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extern int register_cpu(struct cpu *cpu, int num);
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extern struct device *get_cpu_device(unsigned cpu);
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extern bool cpu_is_hotpluggable(unsigned cpu);
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extern bool arch_match_cpu_phys_id(int cpu, u64 phys_id);
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extern bool arch_find_n_match_cpu_physical_id(struct device_node *cpun,
					      int cpu, unsigned int *thread);
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extern int cpu_add_dev_attr(struct device_attribute *attr);
extern void cpu_remove_dev_attr(struct device_attribute *attr);
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extern int cpu_add_dev_attr_group(struct attribute_group *attrs);
extern void cpu_remove_dev_attr_group(struct attribute_group *attrs);
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extern __printf(4, 5)
struct device *cpu_device_create(struct device *parent, void *drvdata,
				 const struct attribute_group **groups,
				 const char *fmt, ...);
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#ifdef CONFIG_HOTPLUG_CPU
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extern void unregister_cpu(struct cpu *cpu);
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extern ssize_t arch_cpu_probe(const char *, size_t);
extern ssize_t arch_cpu_release(const char *, size_t);
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#endif
struct notifier_block;

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#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 */
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#define CPU_BROKEN		0x000B /* CPU (unsigned)v did not die properly,
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					* perhaps due to preemption. */
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/* 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)

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#ifdef CONFIG_SMP
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extern bool cpuhp_tasks_frozen;
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/* Need to know about CPUs going up/down? */
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#if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE)
#define cpu_notifier(fn, pri) {					\
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	static struct notifier_block fn##_nb =			\
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		{ .notifier_call = fn, .priority = pri };	\
	register_cpu_notifier(&fn##_nb);			\
}
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#define __cpu_notifier(fn, pri) {				\
	static struct notifier_block fn##_nb =			\
		{ .notifier_call = fn, .priority = pri };	\
	__register_cpu_notifier(&fn##_nb);			\
}
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#else /* #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
#define cpu_notifier(fn, pri)	do { (void)(fn); } while (0)
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#define __cpu_notifier(fn, pri)	do { (void)(fn); } while (0)
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#endif /* #else #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
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#ifdef CONFIG_HOTPLUG_CPU
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extern int register_cpu_notifier(struct notifier_block *nb);
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extern int __register_cpu_notifier(struct notifier_block *nb);
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extern void unregister_cpu_notifier(struct notifier_block *nb);
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extern void __unregister_cpu_notifier(struct notifier_block *nb);
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#else
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#ifndef MODULE
extern int register_cpu_notifier(struct notifier_block *nb);
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extern int __register_cpu_notifier(struct notifier_block *nb);
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#else
static inline int register_cpu_notifier(struct notifier_block *nb)
{
	return 0;
}
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static inline int __register_cpu_notifier(struct notifier_block *nb)
{
	return 0;
}
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#endif

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static inline void unregister_cpu_notifier(struct notifier_block *nb)
{
}
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static inline void __unregister_cpu_notifier(struct notifier_block *nb)
{
}
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#endif
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int cpu_up(unsigned int cpu);
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void notify_cpu_starting(unsigned int cpu);
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extern void cpu_maps_update_begin(void);
extern void cpu_maps_update_done(void);
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#define cpu_notifier_register_begin	cpu_maps_update_begin
#define cpu_notifier_register_done	cpu_maps_update_done

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#else	/* CONFIG_SMP */
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#define cpuhp_tasks_frozen	0
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#define cpu_notifier(fn, pri)	do { (void)(fn); } while (0)
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#define __cpu_notifier(fn, pri)	do { (void)(fn); } while (0)
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static inline int register_cpu_notifier(struct notifier_block *nb)
{
	return 0;
}
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static inline int __register_cpu_notifier(struct notifier_block *nb)
{
	return 0;
}

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static inline void unregister_cpu_notifier(struct notifier_block *nb)
{
}

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static inline void __unregister_cpu_notifier(struct notifier_block *nb)
{
}

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static inline void cpu_maps_update_begin(void)
{
}

static inline void cpu_maps_update_done(void)
{
}

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static inline void cpu_notifier_register_begin(void)
{
}

static inline void cpu_notifier_register_done(void)
{
}

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#endif /* CONFIG_SMP */
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extern struct bus_type cpu_subsys;
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#ifdef CONFIG_HOTPLUG_CPU
/* Stop CPUs going up and down. */
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extern void cpu_hotplug_begin(void);
extern void cpu_hotplug_done(void);
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extern void get_online_cpus(void);
extern void put_online_cpus(void);
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extern void cpu_hotplug_disable(void);
extern void cpu_hotplug_enable(void);
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#define hotcpu_notifier(fn, pri)	cpu_notifier(fn, pri)
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#define __hotcpu_notifier(fn, pri)	__cpu_notifier(fn, pri)
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#define register_hotcpu_notifier(nb)	register_cpu_notifier(nb)
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#define __register_hotcpu_notifier(nb)	__register_cpu_notifier(nb)
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#define unregister_hotcpu_notifier(nb)	unregister_cpu_notifier(nb)
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#define __unregister_hotcpu_notifier(nb)	__unregister_cpu_notifier(nb)
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void clear_tasks_mm_cpumask(int cpu);
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int cpu_down(unsigned int cpu);
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#else		/* CONFIG_HOTPLUG_CPU */

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static inline void cpu_hotplug_begin(void) {}
static inline void cpu_hotplug_done(void) {}
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#define get_online_cpus()	do { } while (0)
#define put_online_cpus()	do { } while (0)
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#define cpu_hotplug_disable()	do { } while (0)
#define cpu_hotplug_enable()	do { } while (0)
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#define hotcpu_notifier(fn, pri)	do { (void)(fn); } while (0)
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#define __hotcpu_notifier(fn, pri)	do { (void)(fn); } while (0)
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/* These aren't inline functions due to a GCC bug. */
#define register_hotcpu_notifier(nb)	({ (void)(nb); 0; })
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#define __register_hotcpu_notifier(nb)	({ (void)(nb); 0; })
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#define unregister_hotcpu_notifier(nb)	({ (void)(nb); })
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#define __unregister_hotcpu_notifier(nb)	({ (void)(nb); })
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#endif		/* CONFIG_HOTPLUG_CPU */
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#ifdef CONFIG_PM_SLEEP_SMP
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extern int freeze_secondary_cpus(int primary);
static inline int disable_nonboot_cpus(void)
{
	return freeze_secondary_cpus(0);
}
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extern void enable_nonboot_cpus(void);
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#else /* !CONFIG_PM_SLEEP_SMP */
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static inline int disable_nonboot_cpus(void) { return 0; }
static inline void enable_nonboot_cpus(void) {}
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#endif /* !CONFIG_PM_SLEEP_SMP */
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void cpu_startup_entry(enum cpuhp_state state);

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void cpu_idle_poll_ctrl(bool enable);

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

bool cpu_in_idle(unsigned long pc);

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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);

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int cpu_report_state(int cpu);
int cpu_check_up_prepare(int cpu);
void cpu_set_state_online(int cpu);
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void play_idle(unsigned long duration_ms);

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#ifdef CONFIG_HOTPLUG_CPU
bool cpu_wait_death(unsigned int cpu, int seconds);
bool cpu_report_death(void);
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void cpuhp_report_idle_dead(void);
#else
static inline void cpuhp_report_idle_dead(void) { }
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#endif /* #ifdef CONFIG_HOTPLUG_CPU */

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#endif /* _LINUX_CPU_H_ */