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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
3947be19 DH |
2 | /* |
3 | * include/linux/memory.h - generic memory definition | |
4 | * | |
5 | * This is mainly for topological representation. We define the | |
6 | * basic "struct memory_block" here, which can be embedded in per-arch | |
7 | * definitions or NUMA information. | |
8 | * | |
9 | * Basic handling of the devices is done in drivers/base/memory.c | |
10 | * and system devices are handled in drivers/base/sys.c. | |
11 | * | |
12 | * Memory block are exported via sysfs in the class/memory/devices/ | |
13 | * directory. | |
14 | * | |
15 | */ | |
16 | #ifndef _LINUX_MEMORY_H_ | |
17 | #define _LINUX_MEMORY_H_ | |
18 | ||
3947be19 DH |
19 | #include <linux/node.h> |
20 | #include <linux/compiler.h> | |
da19cbcf | 21 | #include <linux/mutex.h> |
f02c6968 | 22 | #include <linux/notifier.h> |
3947be19 | 23 | |
05cf9639 | 24 | #define MIN_MEMORY_BLOCK_SIZE (1UL << SECTION_SIZE_BITS) |
a63fdc51 | 25 | |
3947be19 | 26 | struct memory_block { |
d3360164 NF |
27 | unsigned long start_section_nr; |
28 | unsigned long end_section_nr; | |
fa2be40f SJ |
29 | unsigned long state; /* serialized by the dev->lock */ |
30 | int section_count; /* serialized by mem_sysfs_mutex */ | |
31 | int online_type; /* for passing data to online routine */ | |
3947be19 DH |
32 | int phys_device; /* to which fru does this belong? */ |
33 | void *hw; /* optional pointer to fw/hw data */ | |
34 | int (*phys_callback)(struct memory_block *); | |
10fbcf4c | 35 | struct device dev; |
3947be19 DH |
36 | }; |
37 | ||
bc32df00 | 38 | int arch_get_memory_phys_device(unsigned long start_pfn); |
e0a8400c | 39 | unsigned long memory_block_size_bytes(void); |
bc32df00 | 40 | |
3947be19 DH |
41 | /* These states are exposed to userspace as text strings in sysfs */ |
42 | #define MEM_ONLINE (1<<0) /* exposed to userspace */ | |
43 | #define MEM_GOING_OFFLINE (1<<1) /* exposed to userspace */ | |
44 | #define MEM_OFFLINE (1<<2) /* exposed to userspace */ | |
7b78d335 YG |
45 | #define MEM_GOING_ONLINE (1<<3) |
46 | #define MEM_CANCEL_ONLINE (1<<4) | |
47 | #define MEM_CANCEL_OFFLINE (1<<5) | |
3947be19 | 48 | |
7b78d335 YG |
49 | struct memory_notify { |
50 | unsigned long start_pfn; | |
51 | unsigned long nr_pages; | |
d9713679 | 52 | int status_change_nid_normal; |
6715ddf9 | 53 | int status_change_nid_high; |
7b78d335 YG |
54 | int status_change_nid; |
55 | }; | |
3947be19 | 56 | |
925cc71e RJ |
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 | ||
64 | struct 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 | ||
8c65b4a6 TS |
70 | struct notifier_block; |
71 | struct mem_section; | |
72 | ||
0c40ba4f ND |
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 | |
b6b337ad | 78 | #define IPC_CALLBACK_PRI 10 |
0c40ba4f | 79 | |
53947027 | 80 | #ifndef CONFIG_MEMORY_HOTPLUG_SPARSE |
3947be19 DH |
81 | static inline int memory_dev_init(void) |
82 | { | |
83 | return 0; | |
84 | } | |
85 | static inline int register_memory_notifier(struct notifier_block *nb) | |
86 | { | |
87 | return 0; | |
88 | } | |
89 | static inline void unregister_memory_notifier(struct notifier_block *nb) | |
90 | { | |
91 | } | |
7b78d335 YG |
92 | static inline int memory_notify(unsigned long val, void *v) |
93 | { | |
94 | return 0; | |
95 | } | |
925cc71e RJ |
96 | static inline int register_memory_isolate_notifier(struct notifier_block *nb) |
97 | { | |
98 | return 0; | |
99 | } | |
100 | static inline void unregister_memory_isolate_notifier(struct notifier_block *nb) | |
101 | { | |
102 | } | |
103 | static inline int memory_isolate_notify(unsigned long val, void *v) | |
104 | { | |
105 | return 0; | |
106 | } | |
3947be19 | 107 | #else |
7b78d335 YG |
108 | extern int register_memory_notifier(struct notifier_block *nb); |
109 | extern void unregister_memory_notifier(struct notifier_block *nb); | |
925cc71e RJ |
110 | extern int register_memory_isolate_notifier(struct notifier_block *nb); |
111 | extern void unregister_memory_isolate_notifier(struct notifier_block *nb); | |
c04fc586 | 112 | extern int register_new_memory(int, struct mem_section *); |
4edd7cef | 113 | #ifdef CONFIG_MEMORY_HOTREMOVE |
3947be19 | 114 | extern int unregister_memory_section(struct mem_section *); |
4edd7cef | 115 | #endif |
3947be19 | 116 | extern int memory_dev_init(void); |
7b78d335 | 117 | extern int memory_notify(unsigned long val, void *v); |
925cc71e | 118 | extern int memory_isolate_notify(unsigned long val, void *v); |
98383031 RH |
119 | extern struct memory_block *find_memory_block_hinted(struct mem_section *, |
120 | struct memory_block *); | |
c04fc586 | 121 | extern struct memory_block *find_memory_block(struct mem_section *); |
3947be19 | 122 | #define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT) |
53947027 | 123 | #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ |
3947be19 | 124 | |
b9049e23 | 125 | #ifdef CONFIG_MEMORY_HOTPLUG |
f02c6968 | 126 | #define hotplug_memory_notifier(fn, pri) ({ \ |
02d0e675 | 127 | static __meminitdata struct notifier_block fn##_mem_nb =\ |
f02c6968 | 128 | { .notifier_call = fn, .priority = pri };\ |
3947be19 | 129 | register_memory_notifier(&fn##_mem_nb); \ |
f02c6968 AM |
130 | }) |
131 | #define register_hotmemory_notifier(nb) register_memory_notifier(nb) | |
132 | #define unregister_hotmemory_notifier(nb) unregister_memory_notifier(nb) | |
b9049e23 | 133 | #else |
ace6128d | 134 | #define hotplug_memory_notifier(fn, pri) ({ 0; }) |
f02c6968 AM |
135 | /* These aren't inline functions due to a GCC bug. */ |
136 | #define register_hotmemory_notifier(nb) ({ (void)(nb); 0; }) | |
137 | #define unregister_hotmemory_notifier(nb) ({ (void)(nb); }) | |
b9049e23 | 138 | #endif |
3947be19 | 139 | |
0e39ac44 MD |
140 | /* |
141 | * Kernel text modification mutex, used for code patching. Users of this lock | |
142 | * can sleep. | |
143 | */ | |
144 | extern struct mutex text_mutex; | |
145 | ||
3947be19 | 146 | #endif /* _LINUX_MEMORY_H_ */ |