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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 | ||
18 | #include <linux/sysdev.h> | |
19 | #include <linux/node.h> | |
20 | #include <linux/compiler.h> | |
da19cbcf | 21 | #include <linux/mutex.h> |
3947be19 | 22 | |
a63fdc51 BH |
23 | #define MIN_MEMORY_BLOCK_SIZE (1 << SECTION_SIZE_BITS) |
24 | ||
3947be19 | 25 | struct memory_block { |
d3360164 NF |
26 | unsigned long start_section_nr; |
27 | unsigned long end_section_nr; | |
3947be19 | 28 | unsigned long state; |
07681215 NF |
29 | int section_count; |
30 | ||
3947be19 DH |
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 | */ | |
da19cbcf | 37 | struct mutex state_mutex; |
3947be19 DH |
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 sys_device sysdev; | |
42 | }; | |
43 | ||
bc32df00 HC |
44 | int arch_get_memory_phys_device(unsigned long start_pfn); |
45 | ||
3947be19 DH |
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 */ | |
7b78d335 YG |
50 | #define MEM_GOING_ONLINE (1<<3) |
51 | #define MEM_CANCEL_ONLINE (1<<4) | |
52 | #define MEM_CANCEL_OFFLINE (1<<5) | |
3947be19 | 53 | |
7b78d335 YG |
54 | struct memory_notify { |
55 | unsigned long start_pfn; | |
56 | unsigned long nr_pages; | |
57 | int status_change_nid; | |
58 | }; | |
3947be19 | 59 | |
925cc71e RJ |
60 | /* |
61 | * During pageblock isolation, count the number of pages within the | |
62 | * range [start_pfn, start_pfn + nr_pages) which are owned by code | |
63 | * in the notifier chain. | |
64 | */ | |
65 | #define MEM_ISOLATE_COUNT (1<<0) | |
66 | ||
67 | struct memory_isolate_notify { | |
68 | unsigned long start_pfn; /* Start of range to check */ | |
69 | unsigned int nr_pages; /* # pages in range to check */ | |
70 | unsigned int pages_found; /* # pages owned found by callbacks */ | |
71 | }; | |
72 | ||
8c65b4a6 TS |
73 | struct notifier_block; |
74 | struct mem_section; | |
75 | ||
0c40ba4f ND |
76 | /* |
77 | * Priorities for the hotplug memory callback routines (stored in decreasing | |
78 | * order in the callback chain) | |
79 | */ | |
80 | #define SLAB_CALLBACK_PRI 1 | |
b6b337ad | 81 | #define IPC_CALLBACK_PRI 10 |
0c40ba4f | 82 | |
53947027 | 83 | #ifndef CONFIG_MEMORY_HOTPLUG_SPARSE |
3947be19 DH |
84 | static inline int memory_dev_init(void) |
85 | { | |
86 | return 0; | |
87 | } | |
88 | static inline int register_memory_notifier(struct notifier_block *nb) | |
89 | { | |
90 | return 0; | |
91 | } | |
92 | static inline void unregister_memory_notifier(struct notifier_block *nb) | |
93 | { | |
94 | } | |
7b78d335 YG |
95 | static inline int memory_notify(unsigned long val, void *v) |
96 | { | |
97 | return 0; | |
98 | } | |
925cc71e RJ |
99 | static inline int register_memory_isolate_notifier(struct notifier_block *nb) |
100 | { | |
101 | return 0; | |
102 | } | |
103 | static inline void unregister_memory_isolate_notifier(struct notifier_block *nb) | |
104 | { | |
105 | } | |
106 | static inline int memory_isolate_notify(unsigned long val, void *v) | |
107 | { | |
108 | return 0; | |
109 | } | |
3947be19 | 110 | #else |
7b78d335 YG |
111 | extern int register_memory_notifier(struct notifier_block *nb); |
112 | extern void unregister_memory_notifier(struct notifier_block *nb); | |
925cc71e RJ |
113 | extern int register_memory_isolate_notifier(struct notifier_block *nb); |
114 | extern void unregister_memory_isolate_notifier(struct notifier_block *nb); | |
c04fc586 | 115 | extern int register_new_memory(int, struct mem_section *); |
3947be19 DH |
116 | extern int unregister_memory_section(struct mem_section *); |
117 | extern int memory_dev_init(void); | |
b792de39 | 118 | extern int remove_memory_block(unsigned long, struct mem_section *, int); |
7b78d335 | 119 | extern int memory_notify(unsigned long val, void *v); |
925cc71e | 120 | extern int memory_isolate_notify(unsigned long val, void *v); |
98383031 RH |
121 | extern struct memory_block *find_memory_block_hinted(struct mem_section *, |
122 | struct memory_block *); | |
c04fc586 | 123 | extern struct memory_block *find_memory_block(struct mem_section *); |
3947be19 | 124 | #define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT) |
c04fc586 | 125 | enum mem_add_context { BOOT, HOTPLUG }; |
53947027 | 126 | #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ |
3947be19 | 127 | |
b9049e23 | 128 | #ifdef CONFIG_MEMORY_HOTPLUG |
3947be19 | 129 | #define hotplug_memory_notifier(fn, pri) { \ |
02d0e675 | 130 | static __meminitdata struct notifier_block fn##_mem_nb =\ |
3947be19 DH |
131 | { .notifier_call = fn, .priority = pri }; \ |
132 | register_memory_notifier(&fn##_mem_nb); \ | |
133 | } | |
b9049e23 YG |
134 | #else |
135 | #define hotplug_memory_notifier(fn, pri) do { } while (0) | |
136 | #endif | |
3947be19 | 137 | |
06c421ee KH |
138 | /* |
139 | * 'struct memory_accessor' is a generic interface to provide | |
140 | * in-kernel access to persistent memory such as i2c or SPI EEPROMs | |
141 | */ | |
142 | struct memory_accessor { | |
143 | ssize_t (*read)(struct memory_accessor *, char *buf, off_t offset, | |
144 | size_t count); | |
145 | ssize_t (*write)(struct memory_accessor *, const char *buf, | |
146 | off_t offset, size_t count); | |
147 | }; | |
148 | ||
0e39ac44 MD |
149 | /* |
150 | * Kernel text modification mutex, used for code patching. Users of this lock | |
151 | * can sleep. | |
152 | */ | |
153 | extern struct mutex text_mutex; | |
154 | ||
3947be19 | 155 | #endif /* _LINUX_MEMORY_H_ */ |