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Dave Hansen208d54e2005-10-29 18:16:52 -07001#ifndef __LINUX_MEMORY_HOTPLUG_H
2#define __LINUX_MEMORY_HOTPLUG_H
3
4#include <linux/mmzone.h>
5#include <linux/spinlock.h>
Dave Hansen3947be12005-10-29 18:16:54 -07006#include <linux/notifier.h>
Paul Gortmaker187f1882011-11-23 20:12:59 -05007#include <linux/bug.h>
Dave Hansen208d54e2005-10-29 18:16:52 -07008
KAMEZAWA Hiroyuki78679302006-03-06 15:42:49 -08009struct page;
10struct zone;
11struct pglist_data;
Badari Pulavartyea01ea92008-04-28 02:12:01 -070012struct mem_section;
Wen Congyange90bdb72012-10-08 16:34:01 -070013struct memory_block;
KAMEZAWA Hiroyuki78679302006-03-06 15:42:49 -080014
Dave Hansen208d54e2005-10-29 18:16:52 -070015#ifdef CONFIG_MEMORY_HOTPLUG
Yasunori Goto04753272008-04-28 02:13:31 -070016
17/*
Andrea Arcangeli5f24ce52011-01-13 15:47:00 -080018 * Types for free bootmem stored in page->lru.next. These have to be in
19 * some random range in unsigned long space for debugging purposes.
Yasunori Goto04753272008-04-28 02:13:31 -070020 */
Andrea Arcangeli5f24ce52011-01-13 15:47:00 -080021enum {
22 MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12,
23 SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE,
24 MIX_SECTION_INFO,
25 NODE_INFO,
26 MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO,
27};
Yasunori Goto04753272008-04-28 02:13:31 -070028
Lai Jiangshan511c2ab2012-12-11 16:03:16 -080029/* Types for control the zone type of onlined memory */
30enum {
31 ONLINE_KEEP,
32 ONLINE_KERNEL,
33 ONLINE_MOVABLE,
34};
35
Dave Hansen208d54e2005-10-29 18:16:52 -070036/*
37 * pgdat resizing functions
38 */
39static inline
40void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
41{
42 spin_lock_irqsave(&pgdat->node_size_lock, *flags);
43}
44static inline
45void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
46{
Dave Hansenbdc8cb92005-10-29 18:16:53 -070047 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
Dave Hansen208d54e2005-10-29 18:16:52 -070048}
49static inline
50void pgdat_resize_init(struct pglist_data *pgdat)
51{
52 spin_lock_init(&pgdat->node_size_lock);
53}
Dave Hansenbdc8cb92005-10-29 18:16:53 -070054/*
55 * Zone resizing functions
Lai Jiangshan511c2ab2012-12-11 16:03:16 -080056 *
57 * Note: any attempt to resize a zone should has pgdat_resize_lock()
58 * zone_span_writelock() both held. This ensure the size of a zone
59 * can't be changed while pgdat_resize_lock() held.
Dave Hansenbdc8cb92005-10-29 18:16:53 -070060 */
61static inline unsigned zone_span_seqbegin(struct zone *zone)
62{
63 return read_seqbegin(&zone->span_seqlock);
64}
65static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
66{
67 return read_seqretry(&zone->span_seqlock, iv);
68}
69static inline void zone_span_writelock(struct zone *zone)
70{
71 write_seqlock(&zone->span_seqlock);
72}
73static inline void zone_span_writeunlock(struct zone *zone)
74{
75 write_sequnlock(&zone->span_seqlock);
76}
77static inline void zone_seqlock_init(struct zone *zone)
78{
79 seqlock_init(&zone->span_seqlock);
80}
Dave Hansen3947be12005-10-29 18:16:54 -070081extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
82extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
83extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
Dave Hansen3947be12005-10-29 18:16:54 -070084/* VM interface that may be used by firmware interface */
Lai Jiangshan511c2ab2012-12-11 16:03:16 -080085extern int online_pages(unsigned long, unsigned long, int);
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -070086extern void __offline_isolated_pages(unsigned long, unsigned long);
KAMEZAWA Hiroyuki48e94192007-10-16 01:26:14 -070087
Daniel Kiper9d0ad8c2011-07-25 17:12:05 -070088typedef void (*online_page_callback_t)(struct page *page);
89
90extern int set_online_page_callback(online_page_callback_t callback);
91extern int restore_online_page_callback(online_page_callback_t callback);
92
93extern void __online_page_set_limits(struct page *page);
94extern void __online_page_increment_counters(struct page *page);
95extern void __online_page_free(struct page *page);
96
KAMEZAWA Hiroyuki49ac8252010-10-26 14:21:30 -070097#ifdef CONFIG_MEMORY_HOTREMOVE
98extern bool is_pageblock_removable_nolock(struct page *page);
Wen Congyang24d335c2013-02-22 16:32:58 -080099extern int arch_remove_memory(u64 start, u64 size);
KAMEZAWA Hiroyuki49ac8252010-10-26 14:21:30 -0700100#endif /* CONFIG_MEMORY_HOTREMOVE */
101
Dave Hansen3947be12005-10-29 18:16:54 -0700102/* reasonably generic interface to expand the physical pages in a zone */
Gary Hadec04fc582009-01-06 14:39:14 -0800103extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn,
Dave Hansen3947be12005-10-29 18:16:54 -0700104 unsigned long nr_pages);
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700105extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
106 unsigned long nr_pages);
Yasunori Gotobc02af92006-06-27 02:53:30 -0700107
108#ifdef CONFIG_NUMA
109extern int memory_add_physaddr_to_nid(u64 start);
110#else
111static inline int memory_add_physaddr_to_nid(u64 start)
112{
113 return 0;
114}
115#endif
116
Yasunori Goto306d6cb2006-06-27 02:53:32 -0700117#ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
118/*
119 * For supporting node-hotadd, we have to allocate a new pgdat.
120 *
121 * If an arch has generic style NODE_DATA(),
122 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
123 *
124 * In general, generic_alloc_nodedata() is used.
125 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
126 *
127 */
Yasunori Gotodd0932d2006-06-27 02:53:40 -0700128extern pg_data_t *arch_alloc_nodedata(int nid);
129extern void arch_free_nodedata(pg_data_t *pgdat);
Yasunori Goto70490272006-06-27 02:53:39 -0700130extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
Yasunori Goto306d6cb2006-06-27 02:53:32 -0700131
132#else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
133
134#define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
135#define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
136
137#ifdef CONFIG_NUMA
138/*
139 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
140 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
141 * Because, pgdat for the new node is not allocated/initialized yet itself.
142 * To use new node's memory, more consideration will be necessary.
143 */
144#define generic_alloc_nodedata(nid) \
145({ \
146 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
147})
148/*
149 * This definition is just for error path in node hotadd.
150 * For node hotremove, we have to replace this.
151 */
152#define generic_free_nodedata(pgdat) kfree(pgdat)
153
Yasunori Goto10ad4002006-06-27 02:53:33 -0700154extern pg_data_t *node_data[];
155static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
156{
157 node_data[nid] = pgdat;
158}
159
Yasunori Goto306d6cb2006-06-27 02:53:32 -0700160#else /* !CONFIG_NUMA */
161
162/* never called */
163static inline pg_data_t *generic_alloc_nodedata(int nid)
164{
165 BUG();
166 return NULL;
167}
168static inline void generic_free_nodedata(pg_data_t *pgdat)
169{
170}
Yasunori Goto10ad4002006-06-27 02:53:33 -0700171static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
172{
173}
Yasunori Goto306d6cb2006-06-27 02:53:32 -0700174#endif /* CONFIG_NUMA */
175#endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
176
Yasuaki Ishimatsu46723bf2013-02-22 16:33:00 -0800177#ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
178extern void register_page_bootmem_info_node(struct pglist_data *pgdat);
179#else
Yasunori Goto04753272008-04-28 02:13:31 -0700180static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
181{
182}
Yasunori Goto04753272008-04-28 02:13:31 -0700183#endif
Yasuaki Ishimatsu46723bf2013-02-22 16:33:00 -0800184extern void put_page_bootmem(struct page *page);
185extern void get_page_bootmem(unsigned long ingo, struct page *page,
186 unsigned long type);
Yasunori Goto04753272008-04-28 02:13:31 -0700187
KAMEZAWA Hiroyuki925268a2011-01-11 16:44:01 +0900188/*
189 * Lock for memory hotplug guarantees 1) all callbacks for memory hotplug
190 * notifier will be called under this. 2) offline/online/add/remove memory
191 * will not run simultaneously.
192 */
193
KOSAKI Motohiro20d6c962010-12-02 14:31:19 -0800194void lock_memory_hotplug(void);
195void unlock_memory_hotplug(void);
196
Dave Hansen208d54e2005-10-29 18:16:52 -0700197#else /* ! CONFIG_MEMORY_HOTPLUG */
198/*
199 * Stub functions for when hotplug is off
200 */
201static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
202static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
203static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
Dave Hansenbdc8cb92005-10-29 18:16:53 -0700204
205static inline unsigned zone_span_seqbegin(struct zone *zone)
206{
207 return 0;
208}
209static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
210{
211 return 0;
212}
213static inline void zone_span_writelock(struct zone *zone) {}
214static inline void zone_span_writeunlock(struct zone *zone) {}
215static inline void zone_seqlock_init(struct zone *zone) {}
Dave Hansen3947be12005-10-29 18:16:54 -0700216
217static inline int mhp_notimplemented(const char *func)
218{
219 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
220 dump_stack();
221 return -ENOSYS;
222}
223
Yasunori Goto04753272008-04-28 02:13:31 -0700224static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
225{
226}
227
KOSAKI Motohiro20d6c962010-12-02 14:31:19 -0800228static inline void lock_memory_hotplug(void) {}
229static inline void unlock_memory_hotplug(void) {}
230
Dave Hansenbdc8cb92005-10-29 18:16:53 -0700231#endif /* ! CONFIG_MEMORY_HOTPLUG */
Andi Kleen9d99aaa2006-04-07 19:49:15 +0200232
Badari Pulavarty5c755e92008-07-23 21:28:19 -0700233#ifdef CONFIG_MEMORY_HOTREMOVE
234
235extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
Wen Congyang90b30cd2013-02-22 16:33:27 -0800236extern void try_offline_node(int nid);
Badari Pulavarty5c755e92008-07-23 21:28:19 -0700237
238#else
239static inline int is_mem_section_removable(unsigned long pfn,
240 unsigned long nr_pages)
241{
242 return 0;
243}
Wen Congyang90b30cd2013-02-22 16:33:27 -0800244
245static inline void try_offline_node(int nid) {}
Badari Pulavarty5c755e92008-07-23 21:28:19 -0700246#endif /* CONFIG_MEMORY_HOTREMOVE */
247
minskey guocf234222010-05-24 14:32:41 -0700248extern int mem_online_node(int nid);
Yasunori Gotobc02af92006-06-27 02:53:30 -0700249extern int add_memory(int nid, u64 start, u64 size);
250extern int arch_add_memory(int nid, u64 start, u64 size);
Wen Congyanga16cee12012-10-08 16:33:58 -0700251extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
Wen Congyange90bdb72012-10-08 16:34:01 -0700252extern int offline_memory_block(struct memory_block *mem);
Yasuaki Ishimatsu6677e3e2013-02-22 16:32:52 -0800253extern bool is_memblock_offlined(struct memory_block *mem);
Tang Chen60a5a192013-02-22 16:33:14 -0800254extern int remove_memory(int nid, u64 start, u64 size);
Keith Manntheyf28c5ed2006-09-30 23:27:04 -0700255extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
256 int nr_pages);
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700257extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms);
Yasunori Goto04753272008-04-28 02:13:31 -0700258extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
259 unsigned long pnum);
Andi Kleen9d99aaa2006-04-07 19:49:15 +0200260
Dave Hansen208d54e2005-10-29 18:16:52 -0700261#endif /* __LINUX_MEMORY_HOTPLUG_H */