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#include <linux/mutex.h>
  27
  28struct cpu {
  29        int node_id;            /* The node which contains the CPU */
  30        int hotpluggable;       /* creates sysfs control file if hotpluggable */
  31        struct sys_device sysdev;
  32};
  33
  34extern int register_cpu(struct cpu *cpu, int num);
  35extern struct sys_device *get_cpu_sysdev(unsigned cpu);
  36
  37extern int cpu_add_sysdev_attr(struct sysdev_attribute *attr);
  38extern void cpu_remove_sysdev_attr(struct sysdev_attribute *attr);
  39
  40extern int cpu_add_sysdev_attr_group(struct attribute_group *attrs);
  41extern void cpu_remove_sysdev_attr_group(struct attribute_group *attrs);
  42
  43extern int sched_create_sysfs_power_savings_entries(struct sysdev_class *cls);
  44
  45#ifdef CONFIG_HOTPLUG_CPU
  46extern void unregister_cpu(struct cpu *cpu);
  47#endif
  48struct notifier_block;
  49
  50#ifdef CONFIG_SMP
  51/* Need to know about CPUs going up/down? */
  52#ifdef CONFIG_HOTPLUG_CPU
  53extern int register_cpu_notifier(struct notifier_block *nb);
  54extern void unregister_cpu_notifier(struct notifier_block *nb);
  55#else
  56
  57#ifndef MODULE
  58extern int register_cpu_notifier(struct notifier_block *nb);
  59#else
  60static inline int register_cpu_notifier(struct notifier_block *nb)
  61{
  62        return 0;
  63}
  64#endif
  65
  66static inline void unregister_cpu_notifier(struct notifier_block *nb)
  67{
  68}
  69#endif
  70
  71int cpu_up(unsigned int cpu);
  72extern void cpu_hotplug_init(void);
  73extern void cpu_maps_update_begin(void);
  74extern void cpu_maps_update_done(void);
  75
  76#else   /* CONFIG_SMP */
  77
  78static inline int register_cpu_notifier(struct notifier_block *nb)
  79{
  80        return 0;
  81}
  82
  83static inline void unregister_cpu_notifier(struct notifier_block *nb)
  84{
  85}
  86
  87static inline void cpu_hotplug_init(void)
  88{
  89}
  90
  91static inline void cpu_maps_update_begin(void)
  92{
  93}
  94
  95static inline void cpu_maps_update_done(void)
  96{
  97}
  98
  99#endif /* CONFIG_SMP */
 100extern struct sysdev_class cpu_sysdev_class;
 101
 102#ifdef CONFIG_HOTPLUG_CPU
 103/* Stop CPUs going up and down. */
 104
 105static inline void cpuhotplug_mutex_lock(struct mutex *cpu_hp_mutex)
 106{
 107        mutex_lock(cpu_hp_mutex);
 108}
 109
 110static inline void cpuhotplug_mutex_unlock(struct mutex *cpu_hp_mutex)
 111{
 112        mutex_unlock(cpu_hp_mutex);
 113}
 114
 115extern void get_online_cpus(void);
 116extern void put_online_cpus(void);
 117#define hotcpu_notifier(fn, pri) {                              \
 118        static struct notifier_block fn##_nb __cpuinitdata =    \
 119                { .notifier_call = fn, .priority = pri };       \
 120        register_cpu_notifier(&fn##_nb);                        \
 121}
 122#define register_hotcpu_notifier(nb)    register_cpu_notifier(nb)
 123#define unregister_hotcpu_notifier(nb)  unregister_cpu_notifier(nb)
 124int cpu_down(unsigned int cpu);
 125
 126#else           /* CONFIG_HOTPLUG_CPU */
 127
 128static inline void cpuhotplug_mutex_lock(struct mutex *cpu_hp_mutex)
 129{ }
 130static inline void cpuhotplug_mutex_unlock(struct mutex *cpu_hp_mutex)
 131{ }
 132
 133#define get_online_cpus()       do { } while (0)
 134#define put_online_cpus()       do { } while (0)
 135#define hotcpu_notifier(fn, pri)        do { (void)(fn); } while (0)
 136/* These aren't inline functions due to a GCC bug. */
 137#define register_hotcpu_notifier(nb)    ({ (void)(nb); 0; })
 138#define unregister_hotcpu_notifier(nb)  ({ (void)(nb); })
 139#endif          /* CONFIG_HOTPLUG_CPU */
 140
 141#ifdef CONFIG_PM_SLEEP_SMP
 142extern int suspend_cpu_hotplug;
 143
 144extern int disable_nonboot_cpus(void);
 145extern void enable_nonboot_cpus(void);
 146#else /* !CONFIG_PM_SLEEP_SMP */
 147#define suspend_cpu_hotplug     0
 148
 149static inline int disable_nonboot_cpus(void) { return 0; }
 150static inline void enable_nonboot_cpus(void) {}
 151#endif /* !CONFIG_PM_SLEEP_SMP */
 152
 153#endif /* _LINUX_CPU_H_ */
 154