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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
Tang Chen4f7c6b42014-08-06 16:05:13 -070029/* Types for control the zone type of onlined and offlined memory */
Lai Jiangshan511c2ab2012-12-11 16:03:16 -080030enum {
Tang Chen4f7c6b42014-08-06 16:05:13 -070031 MMOP_OFFLINE = -1,
32 MMOP_ONLINE_KEEP,
33 MMOP_ONLINE_KERNEL,
34 MMOP_ONLINE_MOVABLE,
Lai Jiangshan511c2ab2012-12-11 16:03:16 -080035};
36
Dave Hansen208d54e2005-10-29 18:16:52 -070037/*
38 * pgdat resizing functions
39 */
40static inline
41void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
42{
43 spin_lock_irqsave(&pgdat->node_size_lock, *flags);
44}
45static inline
46void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
47{
Dave Hansenbdc8cb92005-10-29 18:16:53 -070048 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
Dave Hansen208d54e2005-10-29 18:16:52 -070049}
50static inline
51void pgdat_resize_init(struct pglist_data *pgdat)
52{
53 spin_lock_init(&pgdat->node_size_lock);
54}
Dave Hansenbdc8cb92005-10-29 18:16:53 -070055/*
56 * Zone resizing functions
Lai Jiangshan511c2ab2012-12-11 16:03:16 -080057 *
58 * Note: any attempt to resize a zone should has pgdat_resize_lock()
59 * zone_span_writelock() both held. This ensure the size of a zone
60 * can't be changed while pgdat_resize_lock() held.
Dave Hansenbdc8cb92005-10-29 18:16:53 -070061 */
62static inline unsigned zone_span_seqbegin(struct zone *zone)
63{
64 return read_seqbegin(&zone->span_seqlock);
65}
66static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
67{
68 return read_seqretry(&zone->span_seqlock, iv);
69}
70static inline void zone_span_writelock(struct zone *zone)
71{
72 write_seqlock(&zone->span_seqlock);
73}
74static inline void zone_span_writeunlock(struct zone *zone)
75{
76 write_sequnlock(&zone->span_seqlock);
77}
78static inline void zone_seqlock_init(struct zone *zone)
79{
80 seqlock_init(&zone->span_seqlock);
81}
Dave Hansen3947be12005-10-29 18:16:54 -070082extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
83extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
84extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
Dave Hansen3947be12005-10-29 18:16:54 -070085/* VM interface that may be used by firmware interface */
Lai Jiangshan511c2ab2012-12-11 16:03:16 -080086extern int online_pages(unsigned long, unsigned long, int);
Zhang Zhened2f2402014-10-09 15:26:31 -070087extern int test_pages_in_a_zone(unsigned long, unsigned long);
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -070088extern void __offline_isolated_pages(unsigned long, unsigned long);
KAMEZAWA Hiroyuki48e94192007-10-16 01:26:14 -070089
Daniel Kiper9d0ad8c2011-07-25 17:12:05 -070090typedef void (*online_page_callback_t)(struct page *page);
91
92extern int set_online_page_callback(online_page_callback_t callback);
93extern int restore_online_page_callback(online_page_callback_t callback);
94
95extern void __online_page_set_limits(struct page *page);
96extern void __online_page_increment_counters(struct page *page);
97extern void __online_page_free(struct page *page);
98
Toshi Kani01b0f192013-11-12 15:07:25 -080099extern int try_online_node(int nid);
100
KAMEZAWA Hiroyuki49ac8252010-10-26 14:21:30 -0700101#ifdef CONFIG_MEMORY_HOTREMOVE
102extern bool is_pageblock_removable_nolock(struct page *page);
Wen Congyang24d335c2013-02-22 16:32:58 -0800103extern int arch_remove_memory(u64 start, u64 size);
David Rientjes4edd7ce2013-04-29 15:08:22 -0700104extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
105 unsigned long nr_pages);
KAMEZAWA Hiroyuki49ac8252010-10-26 14:21:30 -0700106#endif /* CONFIG_MEMORY_HOTREMOVE */
107
Dave Hansen3947be12005-10-29 18:16:54 -0700108/* reasonably generic interface to expand the physical pages in a zone */
Gary Hadec04fc582009-01-06 14:39:14 -0800109extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn,
Dave Hansen3947be12005-10-29 18:16:54 -0700110 unsigned long nr_pages);
Yasunori Gotobc02af92006-06-27 02:53:30 -0700111
112#ifdef CONFIG_NUMA
113extern int memory_add_physaddr_to_nid(u64 start);
114#else
115static inline int memory_add_physaddr_to_nid(u64 start)
116{
117 return 0;
118}
119#endif
120
Yasunori Goto306d6cb2006-06-27 02:53:32 -0700121#ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
122/*
123 * For supporting node-hotadd, we have to allocate a new pgdat.
124 *
125 * If an arch has generic style NODE_DATA(),
126 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
127 *
128 * In general, generic_alloc_nodedata() is used.
129 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
130 *
131 */
Yasunori Gotodd0932d2006-06-27 02:53:40 -0700132extern pg_data_t *arch_alloc_nodedata(int nid);
133extern void arch_free_nodedata(pg_data_t *pgdat);
Yasunori Goto70490272006-06-27 02:53:39 -0700134extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
Yasunori Goto306d6cb2006-06-27 02:53:32 -0700135
136#else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
137
138#define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
139#define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
140
141#ifdef CONFIG_NUMA
142/*
143 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
144 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
145 * Because, pgdat for the new node is not allocated/initialized yet itself.
146 * To use new node's memory, more consideration will be necessary.
147 */
148#define generic_alloc_nodedata(nid) \
149({ \
150 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
151})
152/*
153 * This definition is just for error path in node hotadd.
154 * For node hotremove, we have to replace this.
155 */
156#define generic_free_nodedata(pgdat) kfree(pgdat)
157
Yasunori Goto10ad4002006-06-27 02:53:33 -0700158extern pg_data_t *node_data[];
159static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
160{
161 node_data[nid] = pgdat;
162}
163
Yasunori Goto306d6cb2006-06-27 02:53:32 -0700164#else /* !CONFIG_NUMA */
165
166/* never called */
167static inline pg_data_t *generic_alloc_nodedata(int nid)
168{
169 BUG();
170 return NULL;
171}
172static inline void generic_free_nodedata(pg_data_t *pgdat)
173{
174}
Yasunori Goto10ad4002006-06-27 02:53:33 -0700175static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
176{
177}
Yasunori Goto306d6cb2006-06-27 02:53:32 -0700178#endif /* CONFIG_NUMA */
179#endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
180
Yasuaki Ishimatsu46723bf2013-02-22 16:33:00 -0800181#ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
182extern void register_page_bootmem_info_node(struct pglist_data *pgdat);
183#else
Yasunori Goto04753272008-04-28 02:13:31 -0700184static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
185{
186}
Yasunori Goto04753272008-04-28 02:13:31 -0700187#endif
Yasuaki Ishimatsu46723bf2013-02-22 16:33:00 -0800188extern void put_page_bootmem(struct page *page);
189extern void get_page_bootmem(unsigned long ingo, struct page *page,
190 unsigned long type);
Yasunori Goto04753272008-04-28 02:13:31 -0700191
Vladimir Davydovbfc8c902014-06-04 16:07:18 -0700192void get_online_mems(void);
193void put_online_mems(void);
KOSAKI Motohiro20d6c962010-12-02 14:31:19 -0800194
Dave Hansen208d54e2005-10-29 18:16:52 -0700195#else /* ! CONFIG_MEMORY_HOTPLUG */
196/*
197 * Stub functions for when hotplug is off
198 */
199static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
200static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
201static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
Dave Hansenbdc8cb92005-10-29 18:16:53 -0700202
203static inline unsigned zone_span_seqbegin(struct zone *zone)
204{
205 return 0;
206}
207static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
208{
209 return 0;
210}
211static inline void zone_span_writelock(struct zone *zone) {}
212static inline void zone_span_writeunlock(struct zone *zone) {}
213static inline void zone_seqlock_init(struct zone *zone) {}
Dave Hansen3947be12005-10-29 18:16:54 -0700214
215static inline int mhp_notimplemented(const char *func)
216{
217 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
218 dump_stack();
219 return -ENOSYS;
220}
221
Yasunori Goto04753272008-04-28 02:13:31 -0700222static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
223{
224}
225
Toshi Kani01b0f192013-11-12 15:07:25 -0800226static inline int try_online_node(int nid)
227{
228 return 0;
229}
230
Vladimir Davydovbfc8c902014-06-04 16:07:18 -0700231static inline void get_online_mems(void) {}
232static inline void put_online_mems(void) {}
KOSAKI Motohiro20d6c962010-12-02 14:31:19 -0800233
Dave Hansenbdc8cb92005-10-29 18:16:53 -0700234#endif /* ! CONFIG_MEMORY_HOTPLUG */
Andi Kleen9d99aaa2006-04-07 19:49:15 +0200235
Badari Pulavarty5c755e92008-07-23 21:28:19 -0700236#ifdef CONFIG_MEMORY_HOTREMOVE
237
238extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
Wen Congyang90b30cd2013-02-22 16:33:27 -0800239extern void try_offline_node(int nid);
Rafael J. Wysockiaba6efc2013-06-01 22:24:07 +0200240extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
241extern void remove_memory(int nid, u64 start, u64 size);
Badari Pulavarty5c755e92008-07-23 21:28:19 -0700242
243#else
244static inline int is_mem_section_removable(unsigned long pfn,
245 unsigned long nr_pages)
246{
247 return 0;
248}
Wen Congyang90b30cd2013-02-22 16:33:27 -0800249
250static inline void try_offline_node(int nid) {}
Rafael J. Wysockiaba6efc2013-06-01 22:24:07 +0200251
252static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
253{
254 return -EINVAL;
255}
256
257static inline void remove_memory(int nid, u64 start, u64 size) {}
Badari Pulavarty5c755e92008-07-23 21:28:19 -0700258#endif /* CONFIG_MEMORY_HOTREMOVE */
259
Rafael J. Wysockie2ff3942013-05-08 00:29:49 +0200260extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
261 void *arg, int (*func)(struct memory_block *, void *));
Yasunori Gotobc02af92006-06-27 02:53:30 -0700262extern int add_memory(int nid, u64 start, u64 size);
Wang Nan63264402014-08-06 16:07:36 -0700263extern int zone_for_memory(int nid, u64 start, u64 size, int zone_default);
Yasunori Gotobc02af92006-06-27 02:53:30 -0700264extern int arch_add_memory(int nid, u64 start, u64 size);
Wen Congyanga16cee12012-10-08 16:33:58 -0700265extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
Yasuaki Ishimatsu6677e3e2013-02-22 16:32:52 -0800266extern bool is_memblock_offlined(struct memory_block *mem);
Rafael J. Wysocki242831e2013-05-27 12:58:46 +0200267extern void remove_memory(int nid, u64 start, u64 size);
Zhang Yanfei85b35fe2013-11-12 15:07:42 -0800268extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn);
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700269extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms);
Yasunori Goto04753272008-04-28 02:13:31 -0700270extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
271 unsigned long pnum);
Andi Kleen9d99aaa2006-04-07 19:49:15 +0200272
Dave Hansen208d54e2005-10-29 18:16:52 -0700273#endif /* __LINUX_MEMORY_HOTPLUG_H */