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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 | #define MEM_GOING_ONLINE (1<<3) | |
45 | #define MEM_CANCEL_ONLINE (1<<4) | |
46 | #define MEM_CANCEL_OFFLINE (1<<5) | |
47 | ||
48 | struct memory_notify { | |
49 | unsigned long start_pfn; | |
50 | unsigned long nr_pages; | |
51 | int status_change_nid; | |
52 | }; | |
53 | ||
54 | struct notifier_block; | |
55 | struct mem_section; | |
56 | ||
57 | #ifndef CONFIG_MEMORY_HOTPLUG_SPARSE | |
58 | static inline int memory_dev_init(void) | |
59 | { | |
60 | return 0; | |
61 | } | |
62 | static inline int register_memory_notifier(struct notifier_block *nb) | |
63 | { | |
64 | return 0; | |
65 | } | |
66 | static inline void unregister_memory_notifier(struct notifier_block *nb) | |
67 | { | |
68 | } | |
69 | static inline int memory_notify(unsigned long val, void *v) | |
70 | { | |
71 | return 0; | |
72 | } | |
73 | #else | |
74 | extern int register_memory_notifier(struct notifier_block *nb); | |
75 | extern void unregister_memory_notifier(struct notifier_block *nb); | |
76 | extern int register_new_memory(struct mem_section *); | |
77 | extern int unregister_memory_section(struct mem_section *); | |
78 | extern int memory_dev_init(void); | |
79 | extern int remove_memory_block(unsigned long, struct mem_section *, int); | |
80 | extern int memory_notify(unsigned long val, void *v); | |
81 | #define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT) | |
82 | ||
83 | ||
84 | #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ | |
85 | ||
86 | #ifdef CONFIG_MEMORY_HOTPLUG | |
87 | #define hotplug_memory_notifier(fn, pri) { \ | |
88 | static struct notifier_block fn##_mem_nb = \ | |
89 | { .notifier_call = fn, .priority = pri }; \ | |
90 | register_memory_notifier(&fn##_mem_nb); \ | |
91 | } | |
92 | #else | |
93 | #define hotplug_memory_notifier(fn, pri) do { } while (0) | |
94 | #endif | |
95 | ||
96 | #endif /* _LINUX_MEMORY_H_ */ |