memory.h 2.6 KB

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  1. /*
  2. * include/linux/memory.h - generic memory definition
  3. *
  4. * This is mainly for topological representation. We define the
  5. * basic "struct memory_block" here, which can be embedded in per-arch
  6. * definitions or NUMA information.
  7. *
  8. * Basic handling of the devices is done in drivers/base/memory.c
  9. * and system devices are handled in drivers/base/sys.c.
  10. *
  11. * Memory block are exported via sysfs in the class/memory/devices/
  12. * directory.
  13. *
  14. */
  15. #ifndef _LINUX_MEMORY_H_
  16. #define _LINUX_MEMORY_H_
  17. #include <linux/sysdev.h>
  18. #include <linux/node.h>
  19. #include <linux/compiler.h>
  20. #include <asm/semaphore.h>
  21. struct memory_block {
  22. unsigned long phys_index;
  23. unsigned long state;
  24. /*
  25. * This serializes all state change requests. It isn't
  26. * held during creation because the control files are
  27. * created long after the critical areas during
  28. * initialization.
  29. */
  30. struct semaphore state_sem;
  31. int phys_device; /* to which fru does this belong? */
  32. void *hw; /* optional pointer to fw/hw data */
  33. int (*phys_callback)(struct memory_block *);
  34. struct sys_device sysdev;
  35. };
  36. /* These states are exposed to userspace as text strings in sysfs */
  37. #define MEM_ONLINE (1<<0) /* exposed to userspace */
  38. #define MEM_GOING_OFFLINE (1<<1) /* exposed to userspace */
  39. #define MEM_OFFLINE (1<<2) /* exposed to userspace */
  40. /*
  41. * All of these states are currently kernel-internal for notifying
  42. * kernel components and architectures.
  43. *
  44. * For MEM_MAPPING_INVALID, all notifier chains with priority >0
  45. * are called before pfn_to_page() becomes invalid. The priority=0
  46. * entry is reserved for the function that actually makes
  47. * pfn_to_page() stop working. Any notifiers that want to be called
  48. * after that should have priority <0.
  49. */
  50. #define MEM_MAPPING_INVALID (1<<3)
  51. struct notifier_block;
  52. struct mem_section;
  53. #ifndef CONFIG_MEMORY_HOTPLUG_SPARSE
  54. static inline int memory_dev_init(void)
  55. {
  56. return 0;
  57. }
  58. static inline int register_memory_notifier(struct notifier_block *nb)
  59. {
  60. return 0;
  61. }
  62. static inline void unregister_memory_notifier(struct notifier_block *nb)
  63. {
  64. }
  65. #else
  66. extern int register_new_memory(struct mem_section *);
  67. extern int unregister_memory_section(struct mem_section *);
  68. extern int memory_dev_init(void);
  69. extern int remove_memory_block(unsigned long, struct mem_section *, int);
  70. #define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT)
  71. #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
  72. #define hotplug_memory_notifier(fn, pri) { \
  73. static struct notifier_block fn##_mem_nb = \
  74. { .notifier_call = fn, .priority = pri }; \
  75. register_memory_notifier(&fn##_mem_nb); \
  76. }
  77. #endif /* _LINUX_MEMORY_H_ */