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8021q: fix a potential memory leak
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3947be19
DH
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
3947be19
DH
18#include <linux/node.h>
19#include <linux/compiler.h>
da19cbcf 20#include <linux/mutex.h>
f02c6968 21#include <linux/notifier.h>
3947be19 22
05cf9639 23#define MIN_MEMORY_BLOCK_SIZE (1UL << SECTION_SIZE_BITS)
a63fdc51 24
3947be19 25struct memory_block {
d3360164
NF
26 unsigned long start_section_nr;
27 unsigned long end_section_nr;
fa2be40f
SJ
28 unsigned long state; /* serialized by the dev->lock */
29 int section_count; /* serialized by mem_sysfs_mutex */
30 int online_type; /* for passing data to online routine */
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DH
31 int phys_device; /* to which fru does this belong? */
32 void *hw; /* optional pointer to fw/hw data */
33 int (*phys_callback)(struct memory_block *);
10fbcf4c 34 struct device dev;
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DH
35};
36
bc32df00 37int arch_get_memory_phys_device(unsigned long start_pfn);
41f10726 38unsigned long __weak memory_block_size_bytes(void);
bc32df00 39
3947be19
DH
40/* These states are exposed to userspace as text strings in sysfs */
41#define MEM_ONLINE (1<<0) /* exposed to userspace */
42#define MEM_GOING_OFFLINE (1<<1) /* exposed to userspace */
43#define MEM_OFFLINE (1<<2) /* exposed to userspace */
7b78d335
YG
44#define MEM_GOING_ONLINE (1<<3)
45#define MEM_CANCEL_ONLINE (1<<4)
46#define MEM_CANCEL_OFFLINE (1<<5)
3947be19 47
7b78d335
YG
48struct memory_notify {
49 unsigned long start_pfn;
50 unsigned long nr_pages;
d9713679 51 int status_change_nid_normal;
6715ddf9 52 int status_change_nid_high;
7b78d335
YG
53 int status_change_nid;
54};
3947be19 55
925cc71e
RJ
56/*
57 * During pageblock isolation, count the number of pages within the
58 * range [start_pfn, start_pfn + nr_pages) which are owned by code
59 * in the notifier chain.
60 */
61#define MEM_ISOLATE_COUNT (1<<0)
62
63struct memory_isolate_notify {
64 unsigned long start_pfn; /* Start of range to check */
65 unsigned int nr_pages; /* # pages in range to check */
66 unsigned int pages_found; /* # pages owned found by callbacks */
67};
68
8c65b4a6
TS
69struct notifier_block;
70struct mem_section;
71
0c40ba4f
ND
72/*
73 * Priorities for the hotplug memory callback routines (stored in decreasing
74 * order in the callback chain)
75 */
76#define SLAB_CALLBACK_PRI 1
b6b337ad 77#define IPC_CALLBACK_PRI 10
0c40ba4f 78
53947027 79#ifndef CONFIG_MEMORY_HOTPLUG_SPARSE
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DH
80static inline int memory_dev_init(void)
81{
82 return 0;
83}
84static inline int register_memory_notifier(struct notifier_block *nb)
85{
86 return 0;
87}
88static inline void unregister_memory_notifier(struct notifier_block *nb)
89{
90}
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YG
91static inline int memory_notify(unsigned long val, void *v)
92{
93 return 0;
94}
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RJ
95static inline int register_memory_isolate_notifier(struct notifier_block *nb)
96{
97 return 0;
98}
99static inline void unregister_memory_isolate_notifier(struct notifier_block *nb)
100{
101}
102static inline int memory_isolate_notify(unsigned long val, void *v)
103{
104 return 0;
105}
3947be19 106#else
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107extern int register_memory_notifier(struct notifier_block *nb);
108extern void unregister_memory_notifier(struct notifier_block *nb);
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109extern int register_memory_isolate_notifier(struct notifier_block *nb);
110extern void unregister_memory_isolate_notifier(struct notifier_block *nb);
c04fc586 111extern int register_new_memory(int, struct mem_section *);
4edd7cef 112#ifdef CONFIG_MEMORY_HOTREMOVE
3947be19 113extern int unregister_memory_section(struct mem_section *);
4edd7cef 114#endif
3947be19 115extern int memory_dev_init(void);
7b78d335 116extern int memory_notify(unsigned long val, void *v);
925cc71e 117extern int memory_isolate_notify(unsigned long val, void *v);
98383031
RH
118extern struct memory_block *find_memory_block_hinted(struct mem_section *,
119 struct memory_block *);
c04fc586 120extern struct memory_block *find_memory_block(struct mem_section *);
3947be19 121#define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT)
53947027 122#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
3947be19 123
b9049e23 124#ifdef CONFIG_MEMORY_HOTPLUG
f02c6968 125#define hotplug_memory_notifier(fn, pri) ({ \
02d0e675 126 static __meminitdata struct notifier_block fn##_mem_nb =\
f02c6968 127 { .notifier_call = fn, .priority = pri };\
3947be19 128 register_memory_notifier(&fn##_mem_nb); \
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AM
129})
130#define register_hotmemory_notifier(nb) register_memory_notifier(nb)
131#define unregister_hotmemory_notifier(nb) unregister_memory_notifier(nb)
b9049e23 132#else
ace6128d 133#define hotplug_memory_notifier(fn, pri) ({ 0; })
f02c6968
AM
134/* These aren't inline functions due to a GCC bug. */
135#define register_hotmemory_notifier(nb) ({ (void)(nb); 0; })
136#define unregister_hotmemory_notifier(nb) ({ (void)(nb); })
b9049e23 137#endif
3947be19 138
06c421ee
KH
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
0e39ac44
MD
150/*
151 * Kernel text modification mutex, used for code patching. Users of this lock
152 * can sleep.
153 */
154extern struct mutex text_mutex;
155
3947be19 156#endif /* _LINUX_MEMORY_H_ */