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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
18#include <linux/sysdev.h>
19#include <linux/node.h>
20#include <linux/compiler.h>
21
22#include <asm/semaphore.h>
23
24struct 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
45/*
46 * All of these states are currently kernel-internal for notifying
47 * kernel components and architectures.
48 *
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.
54 */
55#define MEM_MAPPING_INVALID (1<<3)
56
57struct notifier_block;
58struct mem_section;
59
60#ifndef CONFIG_MEMORY_HOTPLUG
61static inline int memory_dev_init(void)
62{
63 return 0;
64}
65static inline int register_memory_notifier(struct notifier_block *nb)
66{
67 return 0;
68}
69static inline void unregister_memory_notifier(struct notifier_block *nb)
70{
71}
72#else
73extern int register_new_memory(struct mem_section *);
74extern int unregister_memory_section(struct mem_section *);
75extern int memory_dev_init(void);
76extern int remove_memory_block(unsigned long, struct mem_section *, int);
77
78#define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT)
79
80struct notifier_block;
81
82#endif /* CONFIG_MEMORY_HOTPLUG */
83
84#define hotplug_memory_notifier(fn, pri) { \
85 static struct notifier_block fn##_mem_nb = \
86 { .notifier_call = fn, .priority = pri }; \
87 register_memory_notifier(&fn##_mem_nb); \
88}
89
90#endif /* _LINUX_MEMORY_H_ */