cpu.h 3.8 KB

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  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. #include <linux/sysdev.h>
  22. #include <linux/node.h>
  23. #include <linux/compiler.h>
  24. #include <linux/cpumask.h>
  25. #include <asm/semaphore.h>
  26. #include <linux/mutex.h>
  27. struct 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. extern int register_cpu(struct cpu *cpu, int num);
  33. extern struct sys_device *get_cpu_sysdev(unsigned cpu);
  34. extern int cpu_add_sysdev_attr(struct sysdev_attribute *attr);
  35. extern void cpu_remove_sysdev_attr(struct sysdev_attribute *attr);
  36. extern int cpu_add_sysdev_attr_group(struct attribute_group *attrs);
  37. extern void cpu_remove_sysdev_attr_group(struct attribute_group *attrs);
  38. #ifdef CONFIG_HOTPLUG_CPU
  39. extern void unregister_cpu(struct cpu *cpu);
  40. #endif
  41. struct notifier_block;
  42. #ifdef CONFIG_SMP
  43. /* Need to know about CPUs going up/down? */
  44. #ifdef CONFIG_HOTPLUG_CPU
  45. extern int register_cpu_notifier(struct notifier_block *nb);
  46. extern void unregister_cpu_notifier(struct notifier_block *nb);
  47. #else
  48. #ifndef MODULE
  49. extern int register_cpu_notifier(struct notifier_block *nb);
  50. #else
  51. static inline int register_cpu_notifier(struct notifier_block *nb)
  52. {
  53. return 0;
  54. }
  55. #endif
  56. static inline void unregister_cpu_notifier(struct notifier_block *nb)
  57. {
  58. }
  59. #endif
  60. int cpu_up(unsigned int cpu);
  61. #else
  62. static inline int register_cpu_notifier(struct notifier_block *nb)
  63. {
  64. return 0;
  65. }
  66. static inline void unregister_cpu_notifier(struct notifier_block *nb)
  67. {
  68. }
  69. #endif /* CONFIG_SMP */
  70. extern struct sysdev_class cpu_sysdev_class;
  71. #ifdef CONFIG_HOTPLUG_CPU
  72. /* Stop CPUs going up and down. */
  73. static inline void cpuhotplug_mutex_lock(struct mutex *cpu_hp_mutex)
  74. {
  75. mutex_lock(cpu_hp_mutex);
  76. }
  77. static inline void cpuhotplug_mutex_unlock(struct mutex *cpu_hp_mutex)
  78. {
  79. mutex_unlock(cpu_hp_mutex);
  80. }
  81. extern void lock_cpu_hotplug(void);
  82. extern void unlock_cpu_hotplug(void);
  83. #define hotcpu_notifier(fn, pri) { \
  84. static struct notifier_block fn##_nb = \
  85. { .notifier_call = fn, .priority = pri }; \
  86. register_cpu_notifier(&fn##_nb); \
  87. }
  88. #define register_hotcpu_notifier(nb) register_cpu_notifier(nb)
  89. #define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb)
  90. int cpu_down(unsigned int cpu);
  91. #define cpu_is_offline(cpu) unlikely(!cpu_online(cpu))
  92. #else /* CONFIG_HOTPLUG_CPU */
  93. static inline void cpuhotplug_mutex_lock(struct mutex *cpu_hp_mutex)
  94. { }
  95. static inline void cpuhotplug_mutex_unlock(struct mutex *cpu_hp_mutex)
  96. { }
  97. #define lock_cpu_hotplug() do { } while (0)
  98. #define unlock_cpu_hotplug() do { } while (0)
  99. #define lock_cpu_hotplug_interruptible() 0
  100. #define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0)
  101. #define register_hotcpu_notifier(nb) do { (void)(nb); } while (0)
  102. #define unregister_hotcpu_notifier(nb) do { (void)(nb); } while (0)
  103. /* CPUs don't go offline once they're online w/o CONFIG_HOTPLUG_CPU */
  104. static inline int cpu_is_offline(int cpu) { return 0; }
  105. #endif /* CONFIG_HOTPLUG_CPU */
  106. #ifdef CONFIG_SUSPEND_SMP
  107. extern int suspend_cpu_hotplug;
  108. extern int disable_nonboot_cpus(void);
  109. extern void enable_nonboot_cpus(void);
  110. #else
  111. #define suspend_cpu_hotplug 0
  112. static inline int disable_nonboot_cpus(void) { return 0; }
  113. static inline void enable_nonboot_cpus(void) {}
  114. #endif
  115. #endif /* _LINUX_CPU_H_ */