include/linux/memory.h

   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
  18 #include <linux/sysdev.h>
  19 #include <linux/node.h>
  20 #include <linux/compiler.h>
  21 #include <linux/semaphore.h>
  22
  23 struct memory_block {
  24         unsigned long phys_index;
  25         unsigned long state;
  26         /*
  27          * This serializes all state change requests.  It isn't
  28          * held during creation because the control files are
  29          * created long after the critical areas during
  30          * initialization.
  31          */
  32         struct semaphore state_sem;
  33         int phys_device;                /* to which fru does this belong? */
  34         void *hw;                       /* optional pointer to fw/hw data */
  35         int (*phys_callback)(struct memory_block *);
  36         struct sys_device sysdev;
  37 };
  38
  39 /* These states are exposed to userspace as text strings in sysfs */
  40 #define MEM_ONLINE              (1<<0) /* exposed to userspace */
  41 #define MEM_GOING_OFFLINE       (1<<1) /* exposed to userspace */
  42 #define MEM_OFFLINE             (1<<2) /* exposed to userspace */
  43 #define MEM_GOING_ONLINE        (1<<3)
  44 #define MEM_CANCEL_ONLINE       (1<<4)
  45 #define MEM_CANCEL_OFFLINE      (1<<5)
  46
  47 struct memory_notify {
  48         unsigned long start_pfn;
  49         unsigned long nr_pages;
  50         int status_change_nid;
  51 };
  52
  53 struct notifier_block;
  54 struct mem_section;
  55
  56 #ifndef CONFIG_MEMORY_HOTPLUG_SPARSE
  57 static inline int memory_dev_init(void)
  58 {
  59         return 0;
  60 }
  61 static inline int register_memory_notifier(struct notifier_block *nb)
  62 {
  63         return 0;
  64 }
  65 static inline void unregister_memory_notifier(struct notifier_block *nb)
  66 {
  67 }
  68 static inline int memory_notify(unsigned long val, void *v)
  69 {
  70         return 0;
  71 }
  72 #else
  73 extern int register_memory_notifier(struct notifier_block *nb);
  74 extern void unregister_memory_notifier(struct notifier_block *nb);
  75 extern int register_new_memory(struct mem_section *);
  76 extern int unregister_memory_section(struct mem_section *);
  77 extern int memory_dev_init(void);
  78 extern int remove_memory_block(unsigned long, struct mem_section *, int);
  79 extern int memory_notify(unsigned long val, void *v);
  80 #define CONFIG_MEM_BLOCK_SIZE   (PAGES_PER_SECTION<<PAGE_SHIFT)
  81
  82
  83 #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
  84
  85 #ifdef CONFIG_MEMORY_HOTPLUG
  86 #define hotplug_memory_notifier(fn, pri) {                      \
  87         static struct notifier_block fn##_mem_nb =              \
  88                 { .notifier_call = fn, .priority = pri };       \
  89         register_memory_notifier(&fn##_mem_nb);                 \
  90 }
  91 #else
  92 #define hotplug_memory_notifier(fn, pri) do { } while (0)
  93 #endif
  94
  95 #endif /* _LINUX_MEMORY_H_ */