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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#include <linux/mutex.h>
22
23struct 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 mutex state_mutex;
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
47struct memory_notify {
48 unsigned long start_pfn;
49 unsigned long nr_pages;
50 int status_change_nid;
51};
52
53struct notifier_block;
54struct mem_section;
55
56/*
57 * Priorities for the hotplug memory callback routines (stored in decreasing
58 * order in the callback chain)
59 */
60#define SLAB_CALLBACK_PRI 1
61#define IPC_CALLBACK_PRI 10
62
63#ifndef CONFIG_MEMORY_HOTPLUG_SPARSE
64static inline int memory_dev_init(void)
65{
66 return 0;
67}
68static inline int register_memory_notifier(struct notifier_block *nb)
69{
70 return 0;
71}
72static inline void unregister_memory_notifier(struct notifier_block *nb)
73{
74}
75static inline int memory_notify(unsigned long val, void *v)
76{
77 return 0;
78}
79#else
80extern int register_memory_notifier(struct notifier_block *nb);
81extern void unregister_memory_notifier(struct notifier_block *nb);
82extern int register_new_memory(int, struct mem_section *);
83extern int unregister_memory_section(struct mem_section *);
84extern int memory_dev_init(void);
85extern int remove_memory_block(unsigned long, struct mem_section *, int);
86extern int memory_notify(unsigned long val, void *v);
87extern struct memory_block *find_memory_block(struct mem_section *);
88#define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT)
89enum mem_add_context { BOOT, HOTPLUG };
90#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
91
92#ifdef CONFIG_MEMORY_HOTPLUG
93#define hotplug_memory_notifier(fn, pri) { \
94 static __meminitdata struct notifier_block fn##_mem_nb =\
95 { .notifier_call = fn, .priority = pri }; \
96 register_memory_notifier(&fn##_mem_nb); \
97}
98#else
99#define hotplug_memory_notifier(fn, pri) do { } while (0)
100#endif
101
102/*
103 * 'struct memory_accessor' is a generic interface to provide
104 * in-kernel access to persistent memory such as i2c or SPI EEPROMs
105 */
106struct memory_accessor {
107 ssize_t (*read)(struct memory_accessor *, char *buf, off_t offset,
108 size_t count);
109 ssize_t (*write)(struct memory_accessor *, const char *buf,
110 off_t offset, size_t count);
111};
112
113/*
114 * Kernel text modification mutex, used for code patching. Users of this lock
115 * can sleep.
116 */
117extern struct mutex text_mutex;
118
119#endif /* _LINUX_MEMORY_H_ */