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
22 #include <asm/semaphore.h>
23
24 struct memory_block {
25 unsigned long phys_index;
26 unsigned long state;
27 /*
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.
32 */
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;
38 };
39
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 */
44 #define MEM_GOING_ONLINE (1<<3)
45 #define MEM_CANCEL_ONLINE (1<<4)
46 #define MEM_CANCEL_OFFLINE (1<<5)
47
48 struct memory_notify {
49 unsigned long start_pfn;
50 unsigned long nr_pages;
51 int status_change_nid;
52 };
53
54 struct notifier_block;
55 struct mem_section;
56
57 #ifndef CONFIG_MEMORY_HOTPLUG_SPARSE
58 static inline int memory_dev_init(void)
59 {
60 return 0;
61 }
62 static inline int register_memory_notifier(struct notifier_block *nb)
63 {
64 return 0;
65 }
66 static inline void unregister_memory_notifier(struct notifier_block *nb)
67 {
68 }
69 static inline int memory_notify(unsigned long val, void *v)
70 {
71 return 0;
72 }
73 #else
74 extern int register_memory_notifier(struct notifier_block *nb);
75 extern void unregister_memory_notifier(struct notifier_block *nb);
76 extern int register_new_memory(struct mem_section *);
77 extern int unregister_memory_section(struct mem_section *);
78 extern int memory_dev_init(void);
79 extern int remove_memory_block(unsigned long, struct mem_section *, int);
80 extern int memory_notify(unsigned long val, void *v);
81 #define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT)
82
83
84 #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
85
86 #ifdef CONFIG_MEMORY_HOTPLUG
87 #define hotplug_memory_notifier(fn, pri) { \
88 static struct notifier_block fn##_mem_nb = \
89 { .notifier_call = fn, .priority = pri }; \
90 register_memory_notifier(&fn##_mem_nb); \
91 }
92 #else
93 #define hotplug_memory_notifier(fn, pri) do { } while (0)
94 #endif
95
96 #endif /* _LINUX_MEMORY_H_ */
97
|
This page was automatically generated by the
LXR engine.
|