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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 | 27 | unsigned long start_section_nr; |
fa2be40f | 28 | unsigned long state; /* serialized by the dev->lock */ |
fa2be40f | 29 | int online_type; /* for passing data to online routine */ |
d0dc12e8 | 30 | int nid; /* NID for this memory block */ |
e9a2e48e | 31 | struct device dev; |
a08a2ae3 OS |
32 | /* |
33 | * Number of vmemmap pages. These pages | |
34 | * lay at the beginning of the memory block. | |
35 | */ | |
36 | unsigned long nr_vmemmap_pages; | |
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 | |
8c65b4a6 TS |
59 | struct notifier_block; |
60 | struct mem_section; | |
61 | ||
0c40ba4f ND |
62 | /* |
63 | * Priorities for the hotplug memory callback routines (stored in decreasing | |
64 | * order in the callback chain) | |
65 | */ | |
66 | #define SLAB_CALLBACK_PRI 1 | |
b6b337ad | 67 | #define IPC_CALLBACK_PRI 10 |
0c40ba4f | 68 | |
53947027 | 69 | #ifndef CONFIG_MEMORY_HOTPLUG_SPARSE |
902ce63b | 70 | static inline void memory_dev_init(void) |
3947be19 | 71 | { |
902ce63b | 72 | return; |
3947be19 DH |
73 | } |
74 | static inline int register_memory_notifier(struct notifier_block *nb) | |
75 | { | |
76 | return 0; | |
77 | } | |
78 | static inline void unregister_memory_notifier(struct notifier_block *nb) | |
79 | { | |
80 | } | |
7b78d335 YG |
81 | static inline int memory_notify(unsigned long val, void *v) |
82 | { | |
83 | return 0; | |
84 | } | |
3947be19 | 85 | #else |
7b78d335 YG |
86 | extern int register_memory_notifier(struct notifier_block *nb); |
87 | extern void unregister_memory_notifier(struct notifier_block *nb); | |
a08a2ae3 OS |
88 | int create_memory_block_devices(unsigned long start, unsigned long size, |
89 | unsigned long vmemmap_pages); | |
4c4b7f9b | 90 | void remove_memory_block_devices(unsigned long start, unsigned long size); |
902ce63b | 91 | extern void memory_dev_init(void); |
7b78d335 | 92 | extern int memory_notify(unsigned long val, void *v); |
c04fc586 | 93 | extern struct memory_block *find_memory_block(struct mem_section *); |
ea884641 DH |
94 | typedef int (*walk_memory_blocks_func_t)(struct memory_block *, void *); |
95 | extern int walk_memory_blocks(unsigned long start, unsigned long size, | |
96 | void *arg, walk_memory_blocks_func_t func); | |
2c91f8fc | 97 | extern int for_each_memory_block(void *arg, walk_memory_blocks_func_t func); |
3947be19 | 98 | #define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT) |
53947027 | 99 | #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ |
3947be19 | 100 | |
b9049e23 | 101 | #ifdef CONFIG_MEMORY_HOTPLUG |
f02c6968 | 102 | #define hotplug_memory_notifier(fn, pri) ({ \ |
02d0e675 | 103 | static __meminitdata struct notifier_block fn##_mem_nb =\ |
f02c6968 | 104 | { .notifier_call = fn, .priority = pri };\ |
3947be19 | 105 | register_memory_notifier(&fn##_mem_nb); \ |
f02c6968 AM |
106 | }) |
107 | #define register_hotmemory_notifier(nb) register_memory_notifier(nb) | |
108 | #define unregister_hotmemory_notifier(nb) unregister_memory_notifier(nb) | |
b9049e23 | 109 | #else |
ace6128d | 110 | #define hotplug_memory_notifier(fn, pri) ({ 0; }) |
f02c6968 AM |
111 | /* These aren't inline functions due to a GCC bug. */ |
112 | #define register_hotmemory_notifier(nb) ({ (void)(nb); 0; }) | |
113 | #define unregister_hotmemory_notifier(nb) ({ (void)(nb); }) | |
b9049e23 | 114 | #endif |
3947be19 | 115 | |
0e39ac44 MD |
116 | /* |
117 | * Kernel text modification mutex, used for code patching. Users of this lock | |
118 | * can sleep. | |
119 | */ | |
120 | extern struct mutex text_mutex; | |
121 | ||
3947be19 | 122 | #endif /* _LINUX_MEMORY_H_ */ |