cpu.h 4.0 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
 * and system devices are handled in drivers/base/sys.c. 
 *
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 * CPUs are exported via sysfs in the class/cpu/devices/
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 * directory. 
 *
 * Per-cpu interfaces can be implemented using a struct device_interface. 
 * See the following for how to do this: 
 * - drivers/base/intf.c 
 * - Documentation/driver-model/interface.txt
 */
#ifndef _LINUX_CPU_H_
#define _LINUX_CPU_H_

#include <linux/sysdev.h>
#include <linux/node.h>
#include <linux/compiler.h>
#include <linux/cpumask.h>

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 sys_device sysdev;
};

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extern int register_cpu(struct cpu *cpu, int num);
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extern struct sys_device *get_cpu_sysdev(unsigned cpu);
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extern int cpu_add_sysdev_attr(struct sysdev_attribute *attr);
extern void cpu_remove_sysdev_attr(struct sysdev_attribute *attr);

extern int cpu_add_sysdev_attr_group(struct attribute_group *attrs);
extern void cpu_remove_sysdev_attr_group(struct attribute_group *attrs);

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extern int sched_create_sysfs_power_savings_entries(struct sysdev_class *cls);
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#ifdef CONFIG_HOTPLUG_CPU
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extern void unregister_cpu(struct cpu *cpu);
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#endif
struct notifier_block;

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

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static inline void unregister_cpu_notifier(struct notifier_block *nb)
{
}
#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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#else	/* CONFIG_SMP */
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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 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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#endif /* CONFIG_SMP */
extern struct sysdev_class cpu_sysdev_class;

#ifdef CONFIG_HOTPLUG_CPU
/* Stop CPUs going up and down. */
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extern void get_online_cpus(void);
extern void put_online_cpus(void);
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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)
#define unregister_hotcpu_notifier(nb)	unregister_cpu_notifier(nb)
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int cpu_down(unsigned int cpu);
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#else		/* CONFIG_HOTPLUG_CPU */

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#define get_online_cpus()	do { } while (0)
#define put_online_cpus()	do { } 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; })
#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 suspend_cpu_hotplug;

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extern int disable_nonboot_cpus(void);
extern void enable_nonboot_cpus(void);
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#else /* !CONFIG_PM_SLEEP_SMP */
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#define suspend_cpu_hotplug	0

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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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#endif /* _LINUX_CPU_H_ */