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