LXR linux/include/linux/cpu.h

   1/*
   2 * include/linux/cpu.h - generic cpu definition
   3 *
   4 * This is mainly for topological representation. We define the 
   5 * basic 'struct cpu' here, which can be embedded in per-arch 
   6 * definitions of processors.
   7 *
   8 * Basic handling of the devices is done in drivers/base/cpu.c
   9 * and system devices are handled in drivers/base/sys.c. 
  10 *
  11 * CPUs are exported via sysfs in the class/cpu/devices/
  12 * directory. 
  13 *
  14 * Per-cpu interfaces can be implemented using a struct device_interface. 
  15 * See the following for how to do this: 
  16 * - drivers/base/intf.c 
  17 * - Documentation/driver-model/interface.txt
  18 */
  19#ifndef _LINUX_CPU_H_
  20#define _LINUX_CPU_H_
  21
  22#include <linux/sysdev.h>
  23#include <linux/node.h>
  24#include <linux/compiler.h>
  25#include <linux/cpumask.h>
  26
  27struct cpu {
  28        int node_id;            /* The node which contains the CPU */
  29        int hotpluggable;       /* creates sysfs control file if hotpluggable */
  30        struct sys_device sysdev;
  31};
  32
  33extern int register_cpu(struct cpu *cpu, int num);
  34extern struct sys_device *get_cpu_sysdev(unsigned cpu);
  35
  36extern int cpu_add_sysdev_attr(struct sysdev_attribute *attr);
  37extern void cpu_remove_sysdev_attr(struct sysdev_attribute *attr);
  38
  39extern int cpu_add_sysdev_attr_group(struct attribute_group *attrs);
  40extern void cpu_remove_sysdev_attr_group(struct attribute_group *attrs);
  41
  42extern int sched_create_sysfs_power_savings_entries(struct sysdev_class *cls);
  43
  44#ifdef CONFIG_HOTPLUG_CPU
  45extern void unregister_cpu(struct cpu *cpu);
  46#endif
  47struct notifier_block;
  48
  49#ifdef CONFIG_SMP
  50/* Need to know about CPUs going up/down? */
  51#if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE)
  52#define cpu_notifier(fn, pri) {                                 \
  53        static struct notifier_block fn##_nb __cpuinitdata =    \
  54                { .notifier_call = fn, .priority = pri };       \
  55        register_cpu_notifier(&fn##_nb);                        \
  56}
  57#else /* #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
  58#define cpu_notifier(fn, pri)   do { (void)(fn); } while (0)
  59#endif /* #else #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
  60#ifdef CONFIG_HOTPLUG_CPU
  61extern int register_cpu_notifier(struct notifier_block *nb);
  62extern void unregister_cpu_notifier(struct notifier_block *nb);
  63#else
  64
  65#ifndef MODULE
  66extern int register_cpu_notifier(struct notifier_block *nb);
  67#else
  68static inline int register_cpu_notifier(struct notifier_block *nb)
  69{
  70        return 0;
  71}
  72#endif
  73
  74static inline void unregister_cpu_notifier(struct notifier_block *nb)
  75{
  76}
  77#endif
  78
  79int cpu_up(unsigned int cpu);
  80void notify_cpu_starting(unsigned int cpu);
  81extern void cpu_maps_update_begin(void);
  82extern void cpu_maps_update_done(void);
  83
  84#else   /* CONFIG_SMP */
  85
  86#define cpu_notifier(fn, pri)   do { (void)(fn); } while (0)
  87
  88static inline int register_cpu_notifier(struct notifier_block *nb)
  89{
  90        return 0;
  91}
  92
  93static inline void unregister_cpu_notifier(struct notifier_block *nb)
  94{
  95}
  96
  97static inline void cpu_maps_update_begin(void)
  98{
  99}
 100
 101static inline void cpu_maps_update_done(void)
 102{
 103}
 104
 105#endif /* CONFIG_SMP */
 106extern struct sysdev_class cpu_sysdev_class;
 107
 108#ifdef CONFIG_HOTPLUG_CPU
 109/* Stop CPUs going up and down. */
 110
 111extern void get_online_cpus(void);
 112extern void put_online_cpus(void);
 113#define hotcpu_notifier(fn, pri)        cpu_notifier(fn, pri)
 114#define register_hotcpu_notifier(nb)    register_cpu_notifier(nb)
 115#define unregister_hotcpu_notifier(nb)  unregister_cpu_notifier(nb)
 116int cpu_down(unsigned int cpu);
 117
 118#else           /* CONFIG_HOTPLUG_CPU */
 119
 120#define get_online_cpus()       do { } while (0)
 121#define put_online_cpus()       do { } while (0)
 122#define hotcpu_notifier(fn, pri)        do { (void)(fn); } while (0)
 123/* These aren't inline functions due to a GCC bug. */
 124#define register_hotcpu_notifier(nb)    ({ (void)(nb); 0; })
 125#define unregister_hotcpu_notifier(nb)  ({ (void)(nb); })
 126#endif          /* CONFIG_HOTPLUG_CPU */
 127
 128#ifdef CONFIG_PM_SLEEP_SMP
 129extern int suspend_cpu_hotplug;
 130
 131extern int disable_nonboot_cpus(void);
 132extern void enable_nonboot_cpus(void);
 133#else /* !CONFIG_PM_SLEEP_SMP */
 134#define suspend_cpu_hotplug     0
 135
 136static inline int disable_nonboot_cpus(void) { return 0; }
 137static inline void enable_nonboot_cpus(void) {}
 138#endif /* !CONFIG_PM_SLEEP_SMP */
 139
 140#endif /* _LINUX_CPU_H_ */
 141