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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
53/*
54 * During pageblock isolation, count the number of pages within the
55 * range [start_pfn, start_pfn + nr_pages) which are owned by code
56 * in the notifier chain.
57 */
58#define MEM_ISOLATE_COUNT (1<<0)
59
60struct memory_isolate_notify {
61 unsigned long start_pfn; /* Start of range to check */
62 unsigned int nr_pages; /* # pages in range to check */
63 unsigned int pages_found; /* # pages owned found by callbacks */
64};
65
66struct notifier_block;
67struct mem_section;
68
69/*
70 * Priorities for the hotplug memory callback routines (stored in decreasing
71 * order in the callback chain)
72 */
73#define SLAB_CALLBACK_PRI 1
74#define IPC_CALLBACK_PRI 10
75
76#ifndef CONFIG_MEMORY_HOTPLUG_SPARSE
77static inline int memory_dev_init(void)
78{
79 return 0;
80}
81static inline int register_memory_notifier(struct notifier_block *nb)
82{
83 return 0;
84}
85static inline void unregister_memory_notifier(struct notifier_block *nb)
86{
87}
88static inline int memory_notify(unsigned long val, void *v)
89{
90 return 0;
91}
92static inline int register_memory_isolate_notifier(struct notifier_block *nb)
93{
94 return 0;
95}
96static inline void unregister_memory_isolate_notifier(struct notifier_block *nb)
97{
98}
99static inline int memory_isolate_notify(unsigned long val, void *v)
100{
101 return 0;
102}
103#else
104extern int register_memory_notifier(struct notifier_block *nb);
105extern void unregister_memory_notifier(struct notifier_block *nb);
106extern int register_memory_isolate_notifier(struct notifier_block *nb);
107extern void unregister_memory_isolate_notifier(struct notifier_block *nb);
108extern int register_new_memory(int, struct mem_section *);
109extern int unregister_memory_section(struct mem_section *);
110extern int memory_dev_init(void);
111extern int remove_memory_block(unsigned long, struct mem_section *, int);
112extern int memory_notify(unsigned long val, void *v);
113extern int memory_isolate_notify(unsigned long val, void *v);
114extern struct memory_block *find_memory_block(struct mem_section *);
115#define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT)
116enum mem_add_context { BOOT, HOTPLUG };
117#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
118
119#ifdef CONFIG_MEMORY_HOTPLUG
120#define hotplug_memory_notifier(fn, pri) { \
121 static __meminitdata struct notifier_block fn##_mem_nb =\
122 { .notifier_call = fn, .priority = pri }; \
123 register_memory_notifier(&fn##_mem_nb); \
124}
125#else
126#define hotplug_memory_notifier(fn, pri) do { } while (0)
127#endif
128
129/*
130 * 'struct memory_accessor' is a generic interface to provide
131 * in-kernel access to persistent memory such as i2c or SPI EEPROMs
132 */
133struct memory_accessor {
134 ssize_t (*read)(struct memory_accessor *, char *buf, off_t offset,
135 size_t count);
136 ssize_t (*write)(struct memory_accessor *, const char *buf,
137 off_t offset, size_t count);
138};
139
140/*
141 * Kernel text modification mutex, used for code patching. Users of this lock
142 * can sleep.
143 */
144extern struct mutex text_mutex;
145
146#endif /* _LINUX_MEMORY_H_ */