Merge branch 'for-3.11' of git://linux-nfs.org/~bfields/linux
[linux-2.6.git] / include / linux / memory.h
blob85c31a8e290459c6f3d89fd517ccb2e6d748f095
1 /*
2 * include/linux/memory.h - generic memory definition
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.
8 * Basic handling of the devices is done in drivers/base/memory.c
9 * and system devices are handled in drivers/base/sys.c.
11 * Memory block are exported via sysfs in the class/memory/devices/
12 * directory.
15 #ifndef _LINUX_MEMORY_H_
16 #define _LINUX_MEMORY_H_
18 #include <linux/node.h>
19 #include <linux/compiler.h>
20 #include <linux/mutex.h>
21 #include <linux/notifier.h>
23 #define MIN_MEMORY_BLOCK_SIZE (1UL << SECTION_SIZE_BITS)
25 struct memory_block {
26 unsigned long start_section_nr;
27 unsigned long end_section_nr;
28 unsigned long state;
29 int section_count;
32 * This serializes all state change requests. It isn't
33 * held during creation because the control files are
34 * created long after the critical areas during
35 * initialization.
37 struct mutex state_mutex;
38 int phys_device; /* to which fru does this belong? */
39 void *hw; /* optional pointer to fw/hw data */
40 int (*phys_callback)(struct memory_block *);
41 struct device dev;
44 int arch_get_memory_phys_device(unsigned long start_pfn);
46 /* These states are exposed to userspace as text strings in sysfs */
47 #define MEM_ONLINE (1<<0) /* exposed to userspace */
48 #define MEM_GOING_OFFLINE (1<<1) /* exposed to userspace */
49 #define MEM_OFFLINE (1<<2) /* exposed to userspace */
50 #define MEM_GOING_ONLINE (1<<3)
51 #define MEM_CANCEL_ONLINE (1<<4)
52 #define MEM_CANCEL_OFFLINE (1<<5)
54 struct memory_notify {
55 unsigned long start_pfn;
56 unsigned long nr_pages;
57 int status_change_nid_normal;
58 int status_change_nid_high;
59 int status_change_nid;
63 * During pageblock isolation, count the number of pages within the
64 * range [start_pfn, start_pfn + nr_pages) which are owned by code
65 * in the notifier chain.
67 #define MEM_ISOLATE_COUNT (1<<0)
69 struct memory_isolate_notify {
70 unsigned long start_pfn; /* Start of range to check */
71 unsigned int nr_pages; /* # pages in range to check */
72 unsigned int pages_found; /* # pages owned found by callbacks */
75 struct notifier_block;
76 struct mem_section;
79 * Priorities for the hotplug memory callback routines (stored in decreasing
80 * order in the callback chain)
82 #define SLAB_CALLBACK_PRI 1
83 #define IPC_CALLBACK_PRI 10
85 #ifndef CONFIG_MEMORY_HOTPLUG_SPARSE
86 static inline int memory_dev_init(void)
88 return 0;
90 static inline int register_memory_notifier(struct notifier_block *nb)
92 return 0;
94 static inline void unregister_memory_notifier(struct notifier_block *nb)
97 static inline int memory_notify(unsigned long val, void *v)
99 return 0;
101 static inline int register_memory_isolate_notifier(struct notifier_block *nb)
103 return 0;
105 static inline void unregister_memory_isolate_notifier(struct notifier_block *nb)
108 static inline int memory_isolate_notify(unsigned long val, void *v)
110 return 0;
112 #else
113 extern int register_memory_notifier(struct notifier_block *nb);
114 extern void unregister_memory_notifier(struct notifier_block *nb);
115 extern int register_memory_isolate_notifier(struct notifier_block *nb);
116 extern void unregister_memory_isolate_notifier(struct notifier_block *nb);
117 extern int register_new_memory(int, struct mem_section *);
118 #ifdef CONFIG_MEMORY_HOTREMOVE
119 extern int unregister_memory_section(struct mem_section *);
120 #endif
121 extern int memory_dev_init(void);
122 extern int memory_notify(unsigned long val, void *v);
123 extern int memory_isolate_notify(unsigned long val, void *v);
124 extern struct memory_block *find_memory_block_hinted(struct mem_section *,
125 struct memory_block *);
126 extern struct memory_block *find_memory_block(struct mem_section *);
127 #define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT)
128 enum mem_add_context { BOOT, HOTPLUG };
129 #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
131 #ifdef CONFIG_MEMORY_HOTPLUG
132 #define hotplug_memory_notifier(fn, pri) ({ \
133 static __meminitdata struct notifier_block fn##_mem_nb =\
134 { .notifier_call = fn, .priority = pri };\
135 register_memory_notifier(&fn##_mem_nb); \
137 #define register_hotmemory_notifier(nb) register_memory_notifier(nb)
138 #define unregister_hotmemory_notifier(nb) unregister_memory_notifier(nb)
139 #else
140 #define hotplug_memory_notifier(fn, pri) ({ 0; })
141 /* These aren't inline functions due to a GCC bug. */
142 #define register_hotmemory_notifier(nb) ({ (void)(nb); 0; })
143 #define unregister_hotmemory_notifier(nb) ({ (void)(nb); })
144 #endif
147 * 'struct memory_accessor' is a generic interface to provide
148 * in-kernel access to persistent memory such as i2c or SPI EEPROMs
150 struct memory_accessor {
151 ssize_t (*read)(struct memory_accessor *, char *buf, off_t offset,
152 size_t count);
153 ssize_t (*write)(struct memory_accessor *, const char *buf,
154 off_t offset, size_t count);
158 * Kernel text modification mutex, used for code patching. Users of this lock
159 * can sleep.
161 extern struct mutex text_mutex;
163 #endif /* _LINUX_MEMORY_H_ */