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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
Dave Hansen3947be12005-10-29 18:16:54 -070018#include <linux/node.h>
19#include <linux/compiler.h>
Daniel Walkerda19cbc2008-02-04 23:35:47 -080020#include <linux/mutex.h>
Dave Hansen3947be12005-10-29 18:16:54 -070021
Jianguo Wu05cf9632012-09-17 14:08:56 -070022#define MIN_MEMORY_BLOCK_SIZE (1UL << SECTION_SIZE_BITS)
Benjamin Herrenschmidta63fdc52011-06-14 10:57:50 +100023
Dave Hansen3947be12005-10-29 18:16:54 -070024struct memory_block {
Nathan Fontenotd3360162011-01-20 10:44:29 -060025 unsigned long start_section_nr;
26 unsigned long end_section_nr;
Dave Hansen3947be12005-10-29 18:16:54 -070027 unsigned long state;
Nathan Fontenot07681212010-10-19 12:46:19 -050028 int section_count;
29
Dave Hansen3947be12005-10-29 18:16:54 -070030 /*
31 * This serializes all state change requests. It isn't
32 * held during creation because the control files are
33 * created long after the critical areas during
34 * initialization.
35 */
Daniel Walkerda19cbc2008-02-04 23:35:47 -080036 struct mutex state_mutex;
Dave Hansen3947be12005-10-29 18:16:54 -070037 int phys_device; /* to which fru does this belong? */
38 void *hw; /* optional pointer to fw/hw data */
39 int (*phys_callback)(struct memory_block *);
Kay Sievers10fbcf42011-12-21 14:48:43 -080040 struct device dev;
Dave Hansen3947be12005-10-29 18:16:54 -070041};
42
Heiko Carstensbc32df02010-03-15 00:35:03 -040043int arch_get_memory_phys_device(unsigned long start_pfn);
44
Dave Hansen3947be12005-10-29 18:16:54 -070045/* These states are exposed to userspace as text strings in sysfs */
46#define MEM_ONLINE (1<<0) /* exposed to userspace */
47#define MEM_GOING_OFFLINE (1<<1) /* exposed to userspace */
48#define MEM_OFFLINE (1<<2) /* exposed to userspace */
Yasunori Goto7b78d332007-10-21 16:41:36 -070049#define MEM_GOING_ONLINE (1<<3)
50#define MEM_CANCEL_ONLINE (1<<4)
51#define MEM_CANCEL_OFFLINE (1<<5)
Dave Hansen3947be12005-10-29 18:16:54 -070052
Yasunori Goto7b78d332007-10-21 16:41:36 -070053struct memory_notify {
54 unsigned long start_pfn;
55 unsigned long nr_pages;
56 int status_change_nid;
57};
Dave Hansen3947be12005-10-29 18:16:54 -070058
Robert Jennings925cc712009-12-17 14:44:38 +000059/*
60 * During pageblock isolation, count the number of pages within the
61 * range [start_pfn, start_pfn + nr_pages) which are owned by code
62 * in the notifier chain.
63 */
64#define MEM_ISOLATE_COUNT (1<<0)
65
66struct memory_isolate_notify {
67 unsigned long start_pfn; /* Start of range to check */
68 unsigned int nr_pages; /* # pages in range to check */
69 unsigned int pages_found; /* # pages owned found by callbacks */
70};
71
Tim Schmielau8c65b4a2005-11-07 00:59:43 -080072struct notifier_block;
73struct mem_section;
74
Nadia Derbey0c40ba42008-04-29 01:00:41 -070075/*
76 * Priorities for the hotplug memory callback routines (stored in decreasing
77 * order in the callback chain)
78 */
79#define SLAB_CALLBACK_PRI 1
Nadia Derbeyb6b337a2008-04-29 01:00:42 -070080#define IPC_CALLBACK_PRI 10
Nadia Derbey0c40ba42008-04-29 01:00:41 -070081
Keith Mannthey53947022006-09-30 23:27:08 -070082#ifndef CONFIG_MEMORY_HOTPLUG_SPARSE
Dave Hansen3947be12005-10-29 18:16:54 -070083static inline int memory_dev_init(void)
84{
85 return 0;
86}
87static inline int register_memory_notifier(struct notifier_block *nb)
88{
89 return 0;
90}
91static inline void unregister_memory_notifier(struct notifier_block *nb)
92{
93}
Yasunori Goto7b78d332007-10-21 16:41:36 -070094static inline int memory_notify(unsigned long val, void *v)
95{
96 return 0;
97}
Robert Jennings925cc712009-12-17 14:44:38 +000098static inline int register_memory_isolate_notifier(struct notifier_block *nb)
99{
100 return 0;
101}
102static inline void unregister_memory_isolate_notifier(struct notifier_block *nb)
103{
104}
105static inline int memory_isolate_notify(unsigned long val, void *v)
106{
107 return 0;
108}
Dave Hansen3947be12005-10-29 18:16:54 -0700109#else
Yasunori Goto7b78d332007-10-21 16:41:36 -0700110extern int register_memory_notifier(struct notifier_block *nb);
111extern void unregister_memory_notifier(struct notifier_block *nb);
Robert Jennings925cc712009-12-17 14:44:38 +0000112extern int register_memory_isolate_notifier(struct notifier_block *nb);
113extern void unregister_memory_isolate_notifier(struct notifier_block *nb);
Gary Hadec04fc582009-01-06 14:39:14 -0800114extern int register_new_memory(int, struct mem_section *);
Dave Hansen3947be12005-10-29 18:16:54 -0700115extern int unregister_memory_section(struct mem_section *);
116extern int memory_dev_init(void);
Olaf Heringb792de32006-01-08 01:00:32 -0800117extern int remove_memory_block(unsigned long, struct mem_section *, int);
Yasunori Goto7b78d332007-10-21 16:41:36 -0700118extern int memory_notify(unsigned long val, void *v);
Robert Jennings925cc712009-12-17 14:44:38 +0000119extern int memory_isolate_notify(unsigned long val, void *v);
Robin Holt98383032010-09-29 14:00:55 -0500120extern struct memory_block *find_memory_block_hinted(struct mem_section *,
121 struct memory_block *);
Gary Hadec04fc582009-01-06 14:39:14 -0800122extern struct memory_block *find_memory_block(struct mem_section *);
Dave Hansen3947be12005-10-29 18:16:54 -0700123#define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT)
Gary Hadec04fc582009-01-06 14:39:14 -0800124enum mem_add_context { BOOT, HOTPLUG };
Keith Mannthey53947022006-09-30 23:27:08 -0700125#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
Dave Hansen3947be12005-10-29 18:16:54 -0700126
Yasunori Gotob9049e22007-10-21 16:41:37 -0700127#ifdef CONFIG_MEMORY_HOTPLUG
Dave Hansen3947be12005-10-29 18:16:54 -0700128#define hotplug_memory_notifier(fn, pri) { \
Al Viro02d0e672008-11-22 17:38:34 +0000129 static __meminitdata struct notifier_block fn##_mem_nb =\
Dave Hansen3947be12005-10-29 18:16:54 -0700130 { .notifier_call = fn, .priority = pri }; \
131 register_memory_notifier(&fn##_mem_nb); \
132}
Yasunori Gotob9049e22007-10-21 16:41:37 -0700133#else
134#define hotplug_memory_notifier(fn, pri) do { } while (0)
135#endif
Dave Hansen3947be12005-10-29 18:16:54 -0700136
Kevin Hilman06c421e2009-04-02 16:56:56 -0700137/*
138 * 'struct memory_accessor' is a generic interface to provide
139 * in-kernel access to persistent memory such as i2c or SPI EEPROMs
140 */
141struct memory_accessor {
142 ssize_t (*read)(struct memory_accessor *, char *buf, off_t offset,
143 size_t count);
144 ssize_t (*write)(struct memory_accessor *, const char *buf,
145 off_t offset, size_t count);
146};
147
Linus Torvalds714f83d2009-04-05 11:04:19 -0700148/*
Mathieu Desnoyers0e39ac42009-03-06 10:35:52 -0500149 * Kernel text modification mutex, used for code patching. Users of this lock
150 * can sleep.
151 */
152extern struct mutex text_mutex;
153
Dave Hansen3947be12005-10-29 18:16:54 -0700154#endif /* _LINUX_MEMORY_H_ */