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Dave Hansen3947be12005-10-29 18:16:54 -07001/*
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>
Daniel Walkerda19cbc2008-02-04 23:35:47 -080021#include <linux/mutex.h>
Dave Hansen3947be12005-10-29 18:16:54 -070022
23struct 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 */
Daniel Walkerda19cbc2008-02-04 23:35:47 -080032 struct mutex state_mutex;
Dave Hansen3947be12005-10-29 18:16:54 -070033 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 */
Yasunori Goto7b78d332007-10-21 16:41:36 -070043#define MEM_GOING_ONLINE (1<<3)
44#define MEM_CANCEL_ONLINE (1<<4)
45#define MEM_CANCEL_OFFLINE (1<<5)
Dave Hansen3947be12005-10-29 18:16:54 -070046
Yasunori Goto7b78d332007-10-21 16:41:36 -070047struct memory_notify {
48 unsigned long start_pfn;
49 unsigned long nr_pages;
50 int status_change_nid;
51};
Dave Hansen3947be12005-10-29 18:16:54 -070052
Tim Schmielau8c65b4a2005-11-07 00:59:43 -080053struct notifier_block;
54struct mem_section;
55
Nadia Derbey0c40ba42008-04-29 01:00:41 -070056/*
57 * Priorities for the hotplug memory callback routines (stored in decreasing
58 * order in the callback chain)
59 */
60#define SLAB_CALLBACK_PRI 1
Nadia Derbeyb6b337a2008-04-29 01:00:42 -070061#define IPC_CALLBACK_PRI 10
Nadia Derbey0c40ba42008-04-29 01:00:41 -070062
Keith Mannthey53947022006-09-30 23:27:08 -070063#ifndef CONFIG_MEMORY_HOTPLUG_SPARSE
Dave Hansen3947be12005-10-29 18:16:54 -070064static inline int memory_dev_init(void)
65{
66 return 0;
67}
68static inline int register_memory_notifier(struct notifier_block *nb)
69{
70 return 0;
71}
72static inline void unregister_memory_notifier(struct notifier_block *nb)
73{
74}
Yasunori Goto7b78d332007-10-21 16:41:36 -070075static inline int memory_notify(unsigned long val, void *v)
76{
77 return 0;
78}
Dave Hansen3947be12005-10-29 18:16:54 -070079#else
Yasunori Goto7b78d332007-10-21 16:41:36 -070080extern int register_memory_notifier(struct notifier_block *nb);
81extern void unregister_memory_notifier(struct notifier_block *nb);
Gary Hadec04fc582009-01-06 14:39:14 -080082extern int register_new_memory(int, struct mem_section *);
Dave Hansen3947be12005-10-29 18:16:54 -070083extern int unregister_memory_section(struct mem_section *);
84extern int memory_dev_init(void);
Olaf Heringb792de32006-01-08 01:00:32 -080085extern int remove_memory_block(unsigned long, struct mem_section *, int);
Yasunori Goto7b78d332007-10-21 16:41:36 -070086extern int memory_notify(unsigned long val, void *v);
Gary Hadec04fc582009-01-06 14:39:14 -080087extern struct memory_block *find_memory_block(struct mem_section *);
Dave Hansen3947be12005-10-29 18:16:54 -070088#define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT)
Gary Hadec04fc582009-01-06 14:39:14 -080089enum mem_add_context { BOOT, HOTPLUG };
Keith Mannthey53947022006-09-30 23:27:08 -070090#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
Dave Hansen3947be12005-10-29 18:16:54 -070091
Yasunori Gotob9049e22007-10-21 16:41:37 -070092#ifdef CONFIG_MEMORY_HOTPLUG
Dave Hansen3947be12005-10-29 18:16:54 -070093#define hotplug_memory_notifier(fn, pri) { \
Al Viro02d0e672008-11-22 17:38:34 +000094 static __meminitdata struct notifier_block fn##_mem_nb =\
Dave Hansen3947be12005-10-29 18:16:54 -070095 { .notifier_call = fn, .priority = pri }; \
96 register_memory_notifier(&fn##_mem_nb); \
97}
Yasunori Gotob9049e22007-10-21 16:41:37 -070098#else
99#define hotplug_memory_notifier(fn, pri) do { } while (0)
100#endif
Dave Hansen3947be12005-10-29 18:16:54 -0700101
102#endif /* _LINUX_MEMORY_H_ */