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 #include <linux/mutex.h>
22
23 struct memory_block {
24 unsigned long phys_index;
25 unsigned long state;
26 /*
27 * This serializes all state change requests. It isn't
28 * held during creation because the control files are
29 * created long after the critical areas during
30 * initialization.
31 */
32 struct mutex state_mutex;
33 int phys_device; /* to which fru does this belong? */
34 void *hw; /* optional pointer to fw/hw data */
35 int (*phys_callback)(struct memory_block *);
36 struct sys_device sysdev;
37 };
38
39 /* These states are exposed to userspace as text strings in sysfs */
40 #define MEM_ONLINE (1<<0) /* exposed to userspace */
41 #define MEM_GOING_OFFLINE (1<<1) /* exposed to userspace */
42 #define MEM_OFFLINE (1<<2) /* exposed to userspace */
43 #define MEM_GOING_ONLINE (1<<3)
44 #define MEM_CANCEL_ONLINE (1<<4)
45 #define MEM_CANCEL_OFFLINE (1<<5)
46
47 struct memory_notify {
48 unsigned long start_pfn;
49 unsigned long nr_pages;
50 int status_change_nid;
51 };
52
53 struct notifier_block;
54 struct mem_section;
55
56 /*
57 * Priorities for the hotplug memory callback routines (stored in decreasing
58 * order in the callback chain)
59 */
60 #define SLAB_CALLBACK_PRI 1
61 #define IPC_CALLBACK_PRI 10
62
63 #ifndef CONFIG_MEMORY_HOTPLUG_SPARSE
memory_dev_init(void)64 static inline int memory_dev_init(void)
65 {
66 return 0;
67 }
register_memory_notifier(struct notifier_block * nb)68 static inline int register_memory_notifier(struct notifier_block *nb)
69 {
70 return 0;
71 }
unregister_memory_notifier(struct notifier_block * nb)72 static inline void unregister_memory_notifier(struct notifier_block *nb)
73 {
74 }
memory_notify(unsigned long val,void * v)75 static inline int memory_notify(unsigned long val, void *v)
76 {
77 return 0;
78 }
79 #else
80 extern int register_memory_notifier(struct notifier_block *nb);
81 extern void unregister_memory_notifier(struct notifier_block *nb);
82 extern int register_new_memory(int, struct mem_section *);
83 extern int unregister_memory_section(struct mem_section *);
84 extern int memory_dev_init(void);
85 extern int remove_memory_block(unsigned long, struct mem_section *, int);
86 extern int memory_notify(unsigned long val, void *v);
87 extern struct memory_block *find_memory_block(struct mem_section *);
88 #define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT)
89 enum mem_add_context { BOOT, HOTPLUG };
90 #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
91
92 #ifdef CONFIG_MEMORY_HOTPLUG
93 #define hotplug_memory_notifier(fn, pri) { \
94 static __meminitdata struct notifier_block fn##_mem_nb =\
95 { .notifier_call = fn, .priority = pri }; \
96 register_memory_notifier(&fn##_mem_nb); \
97 }
98 #else
99 #define hotplug_memory_notifier(fn, pri) do { } while (0)
100 #endif
101
102 #endif /* _LINUX_MEMORY_H_ */
103