Linux v2.6.15-rc6
[pohmelfs.git] / include / linux / memory.h
blobdc4081b6f161e3f697c3280bbf9547aed9bfbea1
1 /*
2 * include/linux/memory.h - generic memory definition
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.
8 * Basic handling of the devices is done in drivers/base/memory.c
9 * and system devices are handled in drivers/base/sys.c.
11 * Memory block are exported via sysfs in the class/memory/devices/
12 * directory.
15 #ifndef _LINUX_MEMORY_H_
16 #define _LINUX_MEMORY_H_
18 #include <linux/sysdev.h>
19 #include <linux/node.h>
20 #include <linux/compiler.h>
22 #include <asm/semaphore.h>
24 struct memory_block {
25 unsigned long phys_index;
26 unsigned long state;
28 * This serializes all state change requests. It isn't
29 * held during creation because the control files are
30 * created long after the critical areas during
31 * initialization.
33 struct semaphore state_sem;
34 int phys_device; /* to which fru does this belong? */
35 void *hw; /* optional pointer to fw/hw data */
36 int (*phys_callback)(struct memory_block *);
37 struct sys_device sysdev;
40 /* These states are exposed to userspace as text strings in sysfs */
41 #define MEM_ONLINE (1<<0) /* exposed to userspace */
42 #define MEM_GOING_OFFLINE (1<<1) /* exposed to userspace */
43 #define MEM_OFFLINE (1<<2) /* exposed to userspace */
46 * All of these states are currently kernel-internal for notifying
47 * kernel components and architectures.
49 * For MEM_MAPPING_INVALID, all notifier chains with priority >0
50 * are called before pfn_to_page() becomes invalid. The priority=0
51 * entry is reserved for the function that actually makes
52 * pfn_to_page() stop working. Any notifiers that want to be called
53 * after that should have priority <0.
55 #define MEM_MAPPING_INVALID (1<<3)
57 struct notifier_block;
58 struct mem_section;
60 #ifndef CONFIG_MEMORY_HOTPLUG
61 static inline int memory_dev_init(void)
63 return 0;
65 static inline int register_memory_notifier(struct notifier_block *nb)
67 return 0;
69 static inline void unregister_memory_notifier(struct notifier_block *nb)
72 #else
73 extern int register_memory(struct memory_block *, struct mem_section *section, struct node *);
74 extern int register_new_memory(struct mem_section *);
75 extern int unregister_memory_section(struct mem_section *);
76 extern int memory_dev_init(void);
77 extern int register_memory_notifier(struct notifier_block *nb);
78 extern void unregister_memory_notifier(struct notifier_block *nb);
80 #define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT)
82 extern int invalidate_phys_mapping(unsigned long, unsigned long);
83 struct notifier_block;
85 extern int register_memory_notifier(struct notifier_block *nb);
86 extern void unregister_memory_notifier(struct notifier_block *nb);
88 #endif /* CONFIG_MEMORY_HOTPLUG */
90 #define hotplug_memory_notifier(fn, pri) { \
91 static struct notifier_block fn##_mem_nb = \
92 { .notifier_call = fn, .priority = pri }; \
93 register_memory_notifier(&fn##_mem_nb); \
96 #endif /* _LINUX_MEMORY_H_ */