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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
23#define MIN_MEMORY_BLOCK_SIZE (1 << SECTION_SIZE_BITS)
24
25struct memory_block {
26 unsigned long start_section_nr;
27 unsigned long end_section_nr;
28 unsigned long state;
29 int section_count;
30
31 /*
32 * This serializes all state change requests. It isn't
33 * held during creation because the control files are
34 * created long after the critical areas during
35 * initialization.
36 */
37 struct mutex state_mutex;
38 int phys_device; /* to which fru does this belong? */
39 void *hw; /* optional pointer to fw/hw data */
40 int (*phys_callback)(struct memory_block *);
41 struct sys_device sysdev;
42};
43
44int arch_get_memory_phys_device(unsigned long start_pfn);
45
46/* These states are exposed to userspace as text strings in sysfs */
47#define MEM_ONLINE (1<<0) /* exposed to userspace */
48#define MEM_GOING_OFFLINE (1<<1) /* exposed to userspace */
49#define MEM_OFFLINE (1<<2) /* exposed to userspace */
50#define MEM_GOING_ONLINE (1<<3)
51#define MEM_CANCEL_ONLINE (1<<4)
52#define MEM_CANCEL_OFFLINE (1<<5)
53
54struct memory_notify {
55 unsigned long start_pfn;
56 unsigned long nr_pages;
57 int status_change_nid;
58};
59
60/*
61 * During pageblock isolation, count the number of pages within the
62 * range [start_pfn, start_pfn + nr_pages) which are owned by code
63 * in the notifier chain.
64 */
65#define MEM_ISOLATE_COUNT (1<<0)
66
67struct memory_isolate_notify {
68 unsigned long start_pfn; /* Start of range to check */
69 unsigned int nr_pages; /* # pages in range to check */
70 unsigned int pages_found; /* # pages owned found by callbacks */
71};
72
73struct notifier_block;
74struct mem_section;
75
76/*
77 * Priorities for the hotplug memory callback routines (stored in decreasing
78 * order in the callback chain)
79 */
80#define SLAB_CALLBACK_PRI 1
81#define IPC_CALLBACK_PRI 10
82
83#ifndef CONFIG_MEMORY_HOTPLUG_SPARSE
84static inline int memory_dev_init(void)
85{
86 return 0;
87}
88static inline int register_memory_notifier(struct notifier_block *nb)
89{
90 return 0;
91}
92static inline void unregister_memory_notifier(struct notifier_block *nb)
93{
94}
95static inline int memory_notify(unsigned long val, void *v)
96{
97 return 0;
98}
99static inline int register_memory_isolate_notifier(struct notifier_block *nb)
100{
101 return 0;
102}
103static inline void unregister_memory_isolate_notifier(struct notifier_block *nb)
104{
105}
106static inline int memory_isolate_notify(unsigned long val, void *v)
107{
108 return 0;
109}
110#else
111extern int register_memory_notifier(struct notifier_block *nb);
112extern void unregister_memory_notifier(struct notifier_block *nb);
113extern int register_memory_isolate_notifier(struct notifier_block *nb);
114extern void unregister_memory_isolate_notifier(struct notifier_block *nb);
115extern int register_new_memory(int, struct mem_section *);
116extern int unregister_memory_section(struct mem_section *);
117extern int memory_dev_init(void);
118extern int remove_memory_block(unsigned long, struct mem_section *, int);
119extern int memory_notify(unsigned long val, void *v);
120extern int memory_isolate_notify(unsigned long val, void *v);
121extern struct memory_block *find_memory_block_hinted(struct mem_section *,
122 struct memory_block *);
123extern struct memory_block *find_memory_block(struct mem_section *);
124#define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT)
125enum mem_add_context { BOOT, HOTPLUG };
126#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
127
128#ifdef CONFIG_MEMORY_HOTPLUG
129#define hotplug_memory_notifier(fn, pri) { \
130 static __meminitdata struct notifier_block fn##_mem_nb =\
131 { .notifier_call = fn, .priority = pri }; \
132 register_memory_notifier(&fn##_mem_nb); \
133}
134#else
135#define hotplug_memory_notifier(fn, pri) do { } while (0)
136#endif
137
138/*
139 * 'struct memory_accessor' is a generic interface to provide
140 * in-kernel access to persistent memory such as i2c or SPI EEPROMs
141 */
142struct memory_accessor {
143 ssize_t (*read)(struct memory_accessor *, char *buf, off_t offset,
144 size_t count);
145 ssize_t (*write)(struct memory_accessor *, const char *buf,
146 off_t offset, size_t count);
147};
148
149/*
150 * Kernel text modification mutex, used for code patching. Users of this lock
151 * can sleep.
152 */
153extern struct mutex text_mutex;
154
155#endif /* _LINUX_MEMORY_H_ */