Commit | Line | Data |
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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; |
d0dc12e8 | 36 | int nid; /* NID for this memory block */ |
3947be19 DH |
37 | }; |
38 | ||
bc32df00 | 39 | int arch_get_memory_phys_device(unsigned long start_pfn); |
e0a8400c | 40 | unsigned long memory_block_size_bytes(void); |
f642fb58 | 41 | int set_memory_block_size_order(unsigned int order); |
bc32df00 | 42 | |
3947be19 DH |
43 | /* These states are exposed to userspace as text strings in sysfs */ |
44 | #define MEM_ONLINE (1<<0) /* exposed to userspace */ | |
45 | #define MEM_GOING_OFFLINE (1<<1) /* exposed to userspace */ | |
46 | #define MEM_OFFLINE (1<<2) /* exposed to userspace */ | |
7b78d335 YG |
47 | #define MEM_GOING_ONLINE (1<<3) |
48 | #define MEM_CANCEL_ONLINE (1<<4) | |
49 | #define MEM_CANCEL_OFFLINE (1<<5) | |
3947be19 | 50 | |
7b78d335 YG |
51 | struct memory_notify { |
52 | unsigned long start_pfn; | |
53 | unsigned long nr_pages; | |
d9713679 | 54 | int status_change_nid_normal; |
6715ddf9 | 55 | int status_change_nid_high; |
7b78d335 YG |
56 | int status_change_nid; |
57 | }; | |
3947be19 | 58 | |
925cc71e RJ |
59 | /* |
60 | * During pageblock isolation, count the number of pages within the | |
61 | * range [start_pfn, start_pfn + nr_pages) which are owned by code | |
62 | * in the notifier chain. | |
63 | */ | |
64 | #define MEM_ISOLATE_COUNT (1<<0) | |
65 | ||
66 | struct memory_isolate_notify { | |
67 | unsigned long start_pfn; /* Start of range to check */ | |
68 | unsigned int nr_pages; /* # pages in range to check */ | |
69 | unsigned int pages_found; /* # pages owned found by callbacks */ | |
70 | }; | |
71 | ||
8c65b4a6 TS |
72 | struct notifier_block; |
73 | struct mem_section; | |
74 | ||
0c40ba4f ND |
75 | /* |
76 | * Priorities for the hotplug memory callback routines (stored in decreasing | |
77 | * order in the callback chain) | |
78 | */ | |
79 | #define SLAB_CALLBACK_PRI 1 | |
b6b337ad | 80 | #define IPC_CALLBACK_PRI 10 |
0c40ba4f | 81 | |
53947027 | 82 | #ifndef CONFIG_MEMORY_HOTPLUG_SPARSE |
3947be19 DH |
83 | static inline int memory_dev_init(void) |
84 | { | |
85 | return 0; | |
86 | } | |
87 | static inline int register_memory_notifier(struct notifier_block *nb) | |
88 | { | |
89 | return 0; | |
90 | } | |
91 | static inline void unregister_memory_notifier(struct notifier_block *nb) | |
92 | { | |
93 | } | |
7b78d335 YG |
94 | static inline int memory_notify(unsigned long val, void *v) |
95 | { | |
96 | return 0; | |
97 | } | |
925cc71e RJ |
98 | static inline int register_memory_isolate_notifier(struct notifier_block *nb) |
99 | { | |
100 | return 0; | |
101 | } | |
102 | static inline void unregister_memory_isolate_notifier(struct notifier_block *nb) | |
103 | { | |
104 | } | |
105 | static inline int memory_isolate_notify(unsigned long val, void *v) | |
106 | { | |
107 | return 0; | |
108 | } | |
3947be19 | 109 | #else |
7b78d335 YG |
110 | extern int register_memory_notifier(struct notifier_block *nb); |
111 | extern void unregister_memory_notifier(struct notifier_block *nb); | |
925cc71e RJ |
112 | extern int register_memory_isolate_notifier(struct notifier_block *nb); |
113 | extern void unregister_memory_isolate_notifier(struct notifier_block *nb); | |
db051a0d | 114 | int create_memory_block_devices(unsigned long start, unsigned long size); |
4c4b7f9b | 115 | void remove_memory_block_devices(unsigned long start, unsigned long size); |
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); |
c04fc586 | 119 | extern struct memory_block *find_memory_block(struct mem_section *); |
ea884641 DH |
120 | typedef int (*walk_memory_blocks_func_t)(struct memory_block *, void *); |
121 | extern int walk_memory_blocks(unsigned long start, unsigned long size, | |
122 | void *arg, walk_memory_blocks_func_t func); | |
3947be19 | 123 | #define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT) |
53947027 | 124 | #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ |
3947be19 | 125 | |
b9049e23 | 126 | #ifdef CONFIG_MEMORY_HOTPLUG |
f02c6968 | 127 | #define hotplug_memory_notifier(fn, pri) ({ \ |
02d0e675 | 128 | static __meminitdata struct notifier_block fn##_mem_nb =\ |
f02c6968 | 129 | { .notifier_call = fn, .priority = pri };\ |
3947be19 | 130 | register_memory_notifier(&fn##_mem_nb); \ |
f02c6968 AM |
131 | }) |
132 | #define register_hotmemory_notifier(nb) register_memory_notifier(nb) | |
133 | #define unregister_hotmemory_notifier(nb) unregister_memory_notifier(nb) | |
b9049e23 | 134 | #else |
ace6128d | 135 | #define hotplug_memory_notifier(fn, pri) ({ 0; }) |
f02c6968 AM |
136 | /* These aren't inline functions due to a GCC bug. */ |
137 | #define register_hotmemory_notifier(nb) ({ (void)(nb); 0; }) | |
138 | #define unregister_hotmemory_notifier(nb) ({ (void)(nb); }) | |
b9049e23 | 139 | #endif |
3947be19 | 140 | |
0e39ac44 MD |
141 | /* |
142 | * Kernel text modification mutex, used for code patching. Users of this lock | |
143 | * can sleep. | |
144 | */ | |
145 | extern struct mutex text_mutex; | |
146 | ||
3947be19 | 147 | #endif /* _LINUX_MEMORY_H_ */ |