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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>
Andrew Mortonf02c6962013-04-29 15:08:04 -070021#include <linux/notifier.h>
Dave Hansen3947be12005-10-29 18:16:54 -070022
Jianguo Wu05cf9632012-09-17 14:08:56 -070023#define MIN_MEMORY_BLOCK_SIZE (1UL << SECTION_SIZE_BITS)
Benjamin Herrenschmidta63fdc52011-06-14 10:57:50 +100024
Dave Hansen3947be12005-10-29 18:16:54 -070025struct memory_block {
Nathan Fontenotd3360162011-01-20 10:44:29 -060026 unsigned long start_section_nr;
27 unsigned long end_section_nr;
Seth Jenningsfa2be402013-08-20 16:05:05 -050028 unsigned long state; /* serialized by the dev->lock */
29 int section_count; /* serialized by mem_sysfs_mutex */
30 int online_type; /* for passing data to online routine */
Dave Hansen3947be12005-10-29 18:16:54 -070031 int phys_device; /* to which fru does this belong? */
32 void *hw; /* optional pointer to fw/hw data */
33 int (*phys_callback)(struct memory_block *);
Kay Sievers10fbcf42011-12-21 14:48:43 -080034 struct device dev;
Dave Hansen3947be12005-10-29 18:16:54 -070035};
36
Heiko Carstensbc32df02010-03-15 00:35:03 -040037int arch_get_memory_phys_device(unsigned long start_pfn);
Bjorn Helgaase0a84002014-10-13 19:00:47 -060038unsigned long memory_block_size_bytes(void);
Heiko Carstensbc32df02010-03-15 00:35:03 -040039
Dave Hansen3947be12005-10-29 18:16:54 -070040/* 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 */
Yasunori Goto7b78d332007-10-21 16:41:36 -070044#define MEM_GOING_ONLINE (1<<3)
45#define MEM_CANCEL_ONLINE (1<<4)
46#define MEM_CANCEL_OFFLINE (1<<5)
Dave Hansen3947be12005-10-29 18:16:54 -070047
Yasunori Goto7b78d332007-10-21 16:41:36 -070048struct memory_notify {
49 unsigned long start_pfn;
50 unsigned long nr_pages;
Lai Jiangshand9713672012-12-11 16:01:03 -080051 int status_change_nid_normal;
Lai Jiangshan6715ddf2012-12-12 13:51:49 -080052 int status_change_nid_high;
Yasunori Goto7b78d332007-10-21 16:41:36 -070053 int status_change_nid;
54};
Dave Hansen3947be12005-10-29 18:16:54 -070055
Robert Jennings925cc712009-12-17 14:44:38 +000056/*
57 * During pageblock isolation, count the number of pages within the
58 * range [start_pfn, start_pfn + nr_pages) which are owned by code
59 * in the notifier chain.
60 */
61#define MEM_ISOLATE_COUNT (1<<0)
62
63struct memory_isolate_notify {
64 unsigned long start_pfn; /* Start of range to check */
65 unsigned int nr_pages; /* # pages in range to check */
66 unsigned int pages_found; /* # pages owned found by callbacks */
67};
68
Tim Schmielau8c65b4a2005-11-07 00:59:43 -080069struct notifier_block;
70struct mem_section;
71
Nadia Derbey0c40ba42008-04-29 01:00:41 -070072/*
73 * Priorities for the hotplug memory callback routines (stored in decreasing
74 * order in the callback chain)
75 */
76#define SLAB_CALLBACK_PRI 1
Nadia Derbeyb6b337a2008-04-29 01:00:42 -070077#define IPC_CALLBACK_PRI 10
Nadia Derbey0c40ba42008-04-29 01:00:41 -070078
Keith Mannthey53947022006-09-30 23:27:08 -070079#ifndef CONFIG_MEMORY_HOTPLUG_SPARSE
Dave Hansen3947be12005-10-29 18:16:54 -070080static inline int memory_dev_init(void)
81{
82 return 0;
83}
84static inline int register_memory_notifier(struct notifier_block *nb)
85{
86 return 0;
87}
88static inline void unregister_memory_notifier(struct notifier_block *nb)
89{
90}
Yasunori Goto7b78d332007-10-21 16:41:36 -070091static inline int memory_notify(unsigned long val, void *v)
92{
93 return 0;
94}
Robert Jennings925cc712009-12-17 14:44:38 +000095static inline int register_memory_isolate_notifier(struct notifier_block *nb)
96{
97 return 0;
98}
99static inline void unregister_memory_isolate_notifier(struct notifier_block *nb)
100{
101}
102static inline int memory_isolate_notify(unsigned long val, void *v)
103{
104 return 0;
105}
Dave Hansen3947be12005-10-29 18:16:54 -0700106#else
Yasunori Goto7b78d332007-10-21 16:41:36 -0700107extern int register_memory_notifier(struct notifier_block *nb);
108extern void unregister_memory_notifier(struct notifier_block *nb);
Robert Jennings925cc712009-12-17 14:44:38 +0000109extern int register_memory_isolate_notifier(struct notifier_block *nb);
110extern void unregister_memory_isolate_notifier(struct notifier_block *nb);
Gary Hadec04fc582009-01-06 14:39:14 -0800111extern int register_new_memory(int, struct mem_section *);
David Rientjes4edd7ce2013-04-29 15:08:22 -0700112#ifdef CONFIG_MEMORY_HOTREMOVE
Dave Hansen3947be12005-10-29 18:16:54 -0700113extern int unregister_memory_section(struct mem_section *);
David Rientjes4edd7ce2013-04-29 15:08:22 -0700114#endif
Dave Hansen3947be12005-10-29 18:16:54 -0700115extern int memory_dev_init(void);
Yasunori Goto7b78d332007-10-21 16:41:36 -0700116extern int memory_notify(unsigned long val, void *v);
Robert Jennings925cc712009-12-17 14:44:38 +0000117extern int memory_isolate_notify(unsigned long val, void *v);
Robin Holt98383032010-09-29 14:00:55 -0500118extern struct memory_block *find_memory_block_hinted(struct mem_section *,
119 struct memory_block *);
Gary Hadec04fc582009-01-06 14:39:14 -0800120extern struct memory_block *find_memory_block(struct mem_section *);
Dave Hansen3947be12005-10-29 18:16:54 -0700121#define CONFIG_MEM_BLOCK_SIZE (PAGES_PER_SECTION<<PAGE_SHIFT)
Keith Mannthey53947022006-09-30 23:27:08 -0700122#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
Dave Hansen3947be12005-10-29 18:16:54 -0700123
Yasunori Gotob9049e22007-10-21 16:41:37 -0700124#ifdef CONFIG_MEMORY_HOTPLUG
Andrew Mortonf02c6962013-04-29 15:08:04 -0700125#define hotplug_memory_notifier(fn, pri) ({ \
Al Viro02d0e672008-11-22 17:38:34 +0000126 static __meminitdata struct notifier_block fn##_mem_nb =\
Andrew Mortonf02c6962013-04-29 15:08:04 -0700127 { .notifier_call = fn, .priority = pri };\
Dave Hansen3947be12005-10-29 18:16:54 -0700128 register_memory_notifier(&fn##_mem_nb); \
Andrew Mortonf02c6962013-04-29 15:08:04 -0700129})
130#define register_hotmemory_notifier(nb) register_memory_notifier(nb)
131#define unregister_hotmemory_notifier(nb) unregister_memory_notifier(nb)
Yasunori Gotob9049e22007-10-21 16:41:37 -0700132#else
Vincent Stehléace61282013-04-30 15:26:45 -0700133#define hotplug_memory_notifier(fn, pri) ({ 0; })
Andrew Mortonf02c6962013-04-29 15:08:04 -0700134/* These aren't inline functions due to a GCC bug. */
135#define register_hotmemory_notifier(nb) ({ (void)(nb); 0; })
136#define unregister_hotmemory_notifier(nb) ({ (void)(nb); })
Yasunori Gotob9049e22007-10-21 16:41:37 -0700137#endif
Dave Hansen3947be12005-10-29 18:16:54 -0700138
Kevin Hilman06c421e2009-04-02 16:56:56 -0700139/*
140 * 'struct memory_accessor' is a generic interface to provide
141 * in-kernel access to persistent memory such as i2c or SPI EEPROMs
142 */
143struct memory_accessor {
144 ssize_t (*read)(struct memory_accessor *, char *buf, off_t offset,
145 size_t count);
146 ssize_t (*write)(struct memory_accessor *, const char *buf,
147 off_t offset, size_t count);
148};
149
Linus Torvalds714f83d2009-04-05 11:04:19 -0700150/*
Mathieu Desnoyers0e39ac42009-03-06 10:35:52 -0500151 * Kernel text modification mutex, used for code patching. Users of this lock
152 * can sleep.
153 */
154extern struct mutex text_mutex;
155
Dave Hansen3947be12005-10-29 18:16:54 -0700156#endif /* _LINUX_MEMORY_H_ */