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