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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/node.h>
19#include <linux/compiler.h>
20#include <linux/mutex.h>
21
22#define MIN_MEMORY_BLOCK_SIZE (1UL << SECTION_SIZE_BITS)
23
24struct memory_block {
25 unsigned long start_section_nr;
26 unsigned long end_section_nr;
27 unsigned long state;
28 int section_count;
29
30 /*
31 * This serializes all state change requests. It isn't
32 * held during creation because the control files are
33 * created long after the critical areas during
34 * initialization.
35 */
36 struct mutex state_mutex;
37 int phys_device; /* to which fru does this belong? */
38 void *hw; /* optional pointer to fw/hw data */
39 int (*phys_callback)(struct memory_block *);
40 struct device dev;
41};
42
43int arch_get_memory_phys_device(unsigned long start_pfn);
44
45/* These states are exposed to userspace as text strings in sysfs */
46#define MEM_ONLINE (1<<0) /* exposed to userspace */
47#define MEM_GOING_OFFLINE (1<<1) /* exposed to userspace */
48#define MEM_OFFLINE (1<<2) /* exposed to userspace */
49#define MEM_GOING_ONLINE (1<<3)
50#define MEM_CANCEL_ONLINE (1<<4)
51#define MEM_CANCEL_OFFLINE (1<<5)
52
53struct memory_notify {
54 unsigned long start_pfn;
55 unsigned long nr_pages;
56 int status_change_nid_normal;
57 int status_change_nid_high;
58 int status_change_nid;
59};
60
61/*
62 * During pageblock isolation, count the number of pages within the
63 * range [start_pfn, start_pfn + nr_pages) which are owned by code
64 * in the notifier chain.
65 */
66#define MEM_ISOLATE_COUNT (1<<0)
67
68struct memory_isolate_notify {
69 unsigned long start_pfn; /* Start of range to check */
70 unsigned int nr_pages; /* # pages in range to check */
71 unsigned int pages_found; /* # pages owned found by callbacks */
72};
73
74struct notifier_block;
75struct mem_section;
76
77/*
78 * Priorities for the hotplug memory callback routines (stored in decreasing
79 * order in the callback chain)
80 */
81#define SLAB_CALLBACK_PRI 1
82#define IPC_CALLBACK_PRI 10
83
84#ifndef CONFIG_MEMORY_HOTPLUG_SPARSE
85static inline int memory_dev_init(void)
86{
87 return 0;
88}
89static inline int register_memory_notifier(struct notifier_block *nb)
90{
91 return 0;
92}
93static inline void unregister_memory_notifier(struct notifier_block *nb)
94{
95}
96static inline int memory_notify(unsigned long val, void *v)
97{
98 return 0;
99}
100static inline int register_memory_isolate_notifier(struct notifier_block *nb)
101{
102 return 0;
103}
104static inline void unregister_memory_isolate_notifier(struct notifier_block *nb)
105{
106}
107static inline int memory_isolate_notify(unsigned long val, void *v)
108{
109 return 0;
110}
111#else
112extern int register_memory_notifier(struct notifier_block *nb);
113extern void unregister_memory_notifier(struct notifier_block *nb);
114extern int register_memory_isolate_notifier(struct notifier_block *nb);
115extern void unregister_memory_isolate_notifier(struct notifier_block *nb);
116extern int register_new_memory(int, struct mem_section *);
117extern int unregister_memory_section(struct mem_section *);
118extern int memory_dev_init(void);
119extern int remove_memory_block(unsigned long, struct mem_section *, int);
120extern int memory_notify(unsigned long val, void *v);
121extern int memory_isolate_notify(unsigned long val, void *v);
122extern struct memory_block *find_memory_block_hinted(struct mem_section *,
123 struct memory_block *);
124extern struct memory_block *find_memory_block(struct mem_section *);
125#define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT)
126enum mem_add_context { BOOT, HOTPLUG };
127#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
128
129#ifdef CONFIG_MEMORY_HOTPLUG
130#define hotplug_memory_notifier(fn, pri) { \
131 static __meminitdata struct notifier_block fn##_mem_nb =\
132 { .notifier_call = fn, .priority = pri }; \
133 register_memory_notifier(&fn##_mem_nb); \
134}
135#else
136#define hotplug_memory_notifier(fn, pri) do { } while (0)
137#endif
138
139/*
140 * 'struct memory_accessor' is a generic interface to provide
141 * in-kernel access to persistent memory such as i2c or SPI EEPROMs
142 */
143struct memory_accessor {
144 ssize_t (*read)(struct memory_accessor *, char *buf, off_t offset,
145 size_t count);
146 ssize_t (*write)(struct memory_accessor *, const char *buf,
147 off_t offset, size_t count);
148};
149
150/*
151 * Kernel text modification mutex, used for code patching. Users of this lock
152 * can sleep.
153 */
154extern struct mutex text_mutex;
155
156#endif /* _LINUX_MEMORY_H_ */