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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#include <linux/notifier.h>
22
23#define MIN_MEMORY_BLOCK_SIZE (1UL << 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 device dev;
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_normal;
58 int status_change_nid_high;
59 int status_change_nid;
60};
61
62/*
63 * During pageblock isolation, count the number of pages within the
64 * range [start_pfn, start_pfn + nr_pages) which are owned by code
65 * in the notifier chain.
66 */
67#define MEM_ISOLATE_COUNT (1<<0)
68
69struct memory_isolate_notify {
70 unsigned long start_pfn; /* Start of range to check */
71 unsigned int nr_pages; /* # pages in range to check */
72 unsigned int pages_found; /* # pages owned found by callbacks */
73};
74
75struct notifier_block;
76struct mem_section;
77
78/*
79 * Priorities for the hotplug memory callback routines (stored in decreasing
80 * order in the callback chain)
81 */
82#define SLAB_CALLBACK_PRI 1
83#define IPC_CALLBACK_PRI 10
84
85#ifndef CONFIG_MEMORY_HOTPLUG_SPARSE
86static inline int memory_dev_init(void)
87{
88 return 0;
89}
90static inline int register_memory_notifier(struct notifier_block *nb)
91{
92 return 0;
93}
94static inline void unregister_memory_notifier(struct notifier_block *nb)
95{
96}
97static inline int memory_notify(unsigned long val, void *v)
98{
99 return 0;
100}
101static inline int register_memory_isolate_notifier(struct notifier_block *nb)
102{
103 return 0;
104}
105static inline void unregister_memory_isolate_notifier(struct notifier_block *nb)
106{
107}
108static inline int memory_isolate_notify(unsigned long val, void *v)
109{
110 return 0;
111}
112#else
113extern int register_memory_notifier(struct notifier_block *nb);
114extern void unregister_memory_notifier(struct notifier_block *nb);
115extern int register_memory_isolate_notifier(struct notifier_block *nb);
116extern void unregister_memory_isolate_notifier(struct notifier_block *nb);
117extern int register_new_memory(int, struct mem_section *);
118#ifdef CONFIG_MEMORY_HOTREMOVE
119extern int unregister_memory_section(struct mem_section *);
120#endif
121extern int memory_dev_init(void);
122extern int memory_notify(unsigned long val, void *v);
123extern int memory_isolate_notify(unsigned long val, void *v);
124extern struct memory_block *find_memory_block_hinted(struct mem_section *,
125 struct memory_block *);
126extern struct memory_block *find_memory_block(struct mem_section *);
127#define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT)
128enum mem_add_context { BOOT, HOTPLUG };
129#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
130
131#ifdef CONFIG_MEMORY_HOTPLUG
132#define hotplug_memory_notifier(fn, pri) ({ \
133 static __meminitdata struct notifier_block fn##_mem_nb =\
134 { .notifier_call = fn, .priority = pri };\
135 register_memory_notifier(&fn##_mem_nb); \
136})
137#define register_hotmemory_notifier(nb) register_memory_notifier(nb)
138#define unregister_hotmemory_notifier(nb) unregister_memory_notifier(nb)
139#else
140#define hotplug_memory_notifier(fn, pri) ({ 0; })
141/* These aren't inline functions due to a GCC bug. */
142#define register_hotmemory_notifier(nb) ({ (void)(nb); 0; })
143#define unregister_hotmemory_notifier(nb) ({ (void)(nb); })
144#endif
145
146/*
147 * 'struct memory_accessor' is a generic interface to provide
148 * in-kernel access to persistent memory such as i2c or SPI EEPROMs
149 */
150struct memory_accessor {
151 ssize_t (*read)(struct memory_accessor *, char *buf, off_t offset,
152 size_t count);
153 ssize_t (*write)(struct memory_accessor *, const char *buf,
154 off_t offset, size_t count);
155};
156
157/*
158 * Kernel text modification mutex, used for code patching. Users of this lock
159 * can sleep.
160 */
161extern struct mutex text_mutex;
162
163#endif /* _LINUX_MEMORY_H_ */