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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> | |
21 | ||
22 | #include <asm/semaphore.h> | |
23 | ||
24 | struct memory_block { | |
25 | unsigned long phys_index; | |
26 | unsigned long state; | |
27 | /* | |
28 | * This serializes all state change requests. It isn't | |
29 | * held during creation because the control files are | |
30 | * created long after the critical areas during | |
31 | * initialization. | |
32 | */ | |
33 | struct semaphore state_sem; | |
34 | int phys_device; /* to which fru does this belong? */ | |
35 | void *hw; /* optional pointer to fw/hw data */ | |
36 | int (*phys_callback)(struct memory_block *); | |
37 | struct sys_device sysdev; | |
38 | }; | |
39 | ||
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 */ | |
44 | ||
45 | /* | |
46 | * All of these states are currently kernel-internal for notifying | |
47 | * kernel components and architectures. | |
48 | * | |
49 | * For MEM_MAPPING_INVALID, all notifier chains with priority >0 | |
50 | * are called before pfn_to_page() becomes invalid. The priority=0 | |
51 | * entry is reserved for the function that actually makes | |
52 | * pfn_to_page() stop working. Any notifiers that want to be called | |
53 | * after that should have priority <0. | |
54 | */ | |
55 | #define MEM_MAPPING_INVALID (1<<3) | |
56 | ||
8c65b4a6 TS |
57 | struct notifier_block; |
58 | struct mem_section; | |
59 | ||
3947be19 DH |
60 | #ifndef CONFIG_MEMORY_HOTPLUG |
61 | static inline int memory_dev_init(void) | |
62 | { | |
63 | return 0; | |
64 | } | |
65 | static inline int register_memory_notifier(struct notifier_block *nb) | |
66 | { | |
67 | return 0; | |
68 | } | |
69 | static inline void unregister_memory_notifier(struct notifier_block *nb) | |
70 | { | |
71 | } | |
72 | #else | |
73 | extern int register_memory(struct memory_block *, struct mem_section *section, struct node *); | |
74 | extern int register_new_memory(struct mem_section *); | |
75 | extern int unregister_memory_section(struct mem_section *); | |
76 | extern int memory_dev_init(void); | |
77 | extern int register_memory_notifier(struct notifier_block *nb); | |
78 | extern void unregister_memory_notifier(struct notifier_block *nb); | |
79 | ||
80 | #define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT) | |
81 | ||
82 | extern int invalidate_phys_mapping(unsigned long, unsigned long); | |
83 | struct notifier_block; | |
84 | ||
85 | extern int register_memory_notifier(struct notifier_block *nb); | |
86 | extern void unregister_memory_notifier(struct notifier_block *nb); | |
87 | ||
88 | extern struct sysdev_class memory_sysdev_class; | |
89 | #endif /* CONFIG_MEMORY_HOTPLUG */ | |
90 | ||
91 | #define hotplug_memory_notifier(fn, pri) { \ | |
92 | static struct notifier_block fn##_mem_nb = \ | |
93 | { .notifier_call = fn, .priority = pri }; \ | |
94 | register_memory_notifier(&fn##_mem_nb); \ | |
95 | } | |
96 | ||
97 | #endif /* _LINUX_MEMORY_H_ */ |