/*
   * 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_state_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 __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);			\
  }

  #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)

  #endif /* #else #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */

  #ifdef CONFIG_HOTPLUG_CPU

  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

  
  #ifndef MODULE
  extern int register_cpu_notifier(struct notifier_block *nb);

  extern int __register_cpu_notifier(struct notifier_block *nb);

  #else
  static inline int register_cpu_notifier(struct notifier_block *nb)
  {
  	return 0;
  }

  
  static inline int __register_cpu_notifier(struct notifier_block *nb)
  {
  	return 0;
  }

  #endif

  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 */

  #endif /* _LINUX_CPU_H_ */