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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;
David Vrabel62cedb92015-06-25 16:35:49 +010014struct resource;
KAMEZAWA Hiroyuki78679302006-03-06 15:42:49 -080015
Dave Hansen208d54e2005-10-29 18:16:52 -070016#ifdef CONFIG_MEMORY_HOTPLUG
Yasunori Goto04753272008-04-28 02:13:31 -070017
18/*
Andrea Arcangeli5f24ce52011-01-13 15:47:00 -080019 * Types for free bootmem stored in page->lru.next. These have to be in
20 * some random range in unsigned long space for debugging purposes.
Yasunori Goto04753272008-04-28 02:13:31 -070021 */
Andrea Arcangeli5f24ce52011-01-13 15:47:00 -080022enum {
23 MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12,
24 SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE,
25 MIX_SECTION_INFO,
26 NODE_INFO,
27 MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO,
28};
Yasunori Goto04753272008-04-28 02:13:31 -070029
Tang Chen4f7c6b42014-08-06 16:05:13 -070030/* Types for control the zone type of onlined and offlined memory */
Lai Jiangshan511c2ab2012-12-11 16:03:16 -080031enum {
Tang Chen4f7c6b42014-08-06 16:05:13 -070032 MMOP_OFFLINE = -1,
33 MMOP_ONLINE_KEEP,
34 MMOP_ONLINE_KERNEL,
35 MMOP_ONLINE_MOVABLE,
Lai Jiangshan511c2ab2012-12-11 16:03:16 -080036};
37
Dave Hansen208d54e2005-10-29 18:16:52 -070038/*
39 * pgdat resizing functions
40 */
41static inline
42void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
43{
44 spin_lock_irqsave(&pgdat->node_size_lock, *flags);
45}
46static inline
47void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
48{
Dave Hansenbdc8cb92005-10-29 18:16:53 -070049 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
Dave Hansen208d54e2005-10-29 18:16:52 -070050}
51static inline
52void pgdat_resize_init(struct pglist_data *pgdat)
53{
54 spin_lock_init(&pgdat->node_size_lock);
55}
Dave Hansenbdc8cb92005-10-29 18:16:53 -070056/*
57 * Zone resizing functions
Lai Jiangshan511c2ab2012-12-11 16:03:16 -080058 *
59 * Note: any attempt to resize a zone should has pgdat_resize_lock()
60 * zone_span_writelock() both held. This ensure the size of a zone
61 * can't be changed while pgdat_resize_lock() held.
Dave Hansenbdc8cb92005-10-29 18:16:53 -070062 */
63static inline unsigned zone_span_seqbegin(struct zone *zone)
64{
65 return read_seqbegin(&zone->span_seqlock);
66}
67static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
68{
69 return read_seqretry(&zone->span_seqlock, iv);
70}
71static inline void zone_span_writelock(struct zone *zone)
72{
73 write_seqlock(&zone->span_seqlock);
74}
75static inline void zone_span_writeunlock(struct zone *zone)
76{
77 write_sequnlock(&zone->span_seqlock);
78}
79static inline void zone_seqlock_init(struct zone *zone)
80{
81 seqlock_init(&zone->span_seqlock);
82}
Dave Hansen3947be12005-10-29 18:16:54 -070083extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
84extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
85extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
Dave Hansen3947be12005-10-29 18:16:54 -070086/* VM interface that may be used by firmware interface */
Lai Jiangshan511c2ab2012-12-11 16:03:16 -080087extern int online_pages(unsigned long, unsigned long, int);
Zhang Zhened2f2402014-10-09 15:26:31 -070088extern int test_pages_in_a_zone(unsigned long, unsigned long);
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -070089extern void __offline_isolated_pages(unsigned long, unsigned long);
KAMEZAWA Hiroyuki48e94192007-10-16 01:26:14 -070090
Daniel Kiper9d0ad8c2011-07-25 17:12:05 -070091typedef void (*online_page_callback_t)(struct page *page);
92
93extern int set_online_page_callback(online_page_callback_t callback);
94extern int restore_online_page_callback(online_page_callback_t callback);
95
96extern void __online_page_set_limits(struct page *page);
97extern void __online_page_increment_counters(struct page *page);
98extern void __online_page_free(struct page *page);
99
Toshi Kani01b0f192013-11-12 15:07:25 -0800100extern int try_online_node(int nid);
101
Vitaly Kuznetsov31bc3852016-03-15 14:56:48 -0700102extern bool memhp_auto_online;
103
KAMEZAWA Hiroyuki49ac8252010-10-26 14:21:30 -0700104#ifdef CONFIG_MEMORY_HOTREMOVE
105extern bool is_pageblock_removable_nolock(struct page *page);
Wen Congyang24d335c2013-02-22 16:32:58 -0800106extern int arch_remove_memory(u64 start, u64 size);
David Rientjes4edd7ce2013-04-29 15:08:22 -0700107extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
108 unsigned long nr_pages);
KAMEZAWA Hiroyuki49ac8252010-10-26 14:21:30 -0700109#endif /* CONFIG_MEMORY_HOTREMOVE */
110
Dave Hansen3947be12005-10-29 18:16:54 -0700111/* reasonably generic interface to expand the physical pages in a zone */
Gary Hadec04fc582009-01-06 14:39:14 -0800112extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn,
Dave Hansen3947be12005-10-29 18:16:54 -0700113 unsigned long nr_pages);
Yasunori Gotobc02af92006-06-27 02:53:30 -0700114
115#ifdef CONFIG_NUMA
116extern int memory_add_physaddr_to_nid(u64 start);
117#else
118static inline int memory_add_physaddr_to_nid(u64 start)
119{
120 return 0;
121}
122#endif
123
Yasunori Goto306d6cb2006-06-27 02:53:32 -0700124#ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
125/*
126 * For supporting node-hotadd, we have to allocate a new pgdat.
127 *
128 * If an arch has generic style NODE_DATA(),
129 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
130 *
131 * In general, generic_alloc_nodedata() is used.
132 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
133 *
134 */
Yasunori Gotodd0932d2006-06-27 02:53:40 -0700135extern pg_data_t *arch_alloc_nodedata(int nid);
136extern void arch_free_nodedata(pg_data_t *pgdat);
Yasunori Goto70490272006-06-27 02:53:39 -0700137extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
Yasunori Goto306d6cb2006-06-27 02:53:32 -0700138
139#else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
140
141#define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
142#define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
143
144#ifdef CONFIG_NUMA
145/*
146 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
147 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
148 * Because, pgdat for the new node is not allocated/initialized yet itself.
149 * To use new node's memory, more consideration will be necessary.
150 */
151#define generic_alloc_nodedata(nid) \
152({ \
153 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
154})
155/*
156 * This definition is just for error path in node hotadd.
157 * For node hotremove, we have to replace this.
158 */
159#define generic_free_nodedata(pgdat) kfree(pgdat)
160
Yasunori Goto10ad4002006-06-27 02:53:33 -0700161extern pg_data_t *node_data[];
162static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
163{
164 node_data[nid] = pgdat;
165}
166
Yasunori Goto306d6cb2006-06-27 02:53:32 -0700167#else /* !CONFIG_NUMA */
168
169/* never called */
170static inline pg_data_t *generic_alloc_nodedata(int nid)
171{
172 BUG();
173 return NULL;
174}
175static inline void generic_free_nodedata(pg_data_t *pgdat)
176{
177}
Yasunori Goto10ad4002006-06-27 02:53:33 -0700178static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
179{
180}
Yasunori Goto306d6cb2006-06-27 02:53:32 -0700181#endif /* CONFIG_NUMA */
182#endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
183
Yasuaki Ishimatsu46723bf2013-02-22 16:33:00 -0800184#ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
Linus Torvalds7ded3842016-05-27 15:23:32 -0700185extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat);
Yasuaki Ishimatsu46723bf2013-02-22 16:33:00 -0800186#else
Yasunori Goto04753272008-04-28 02:13:31 -0700187static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
188{
189}
Yasunori Goto04753272008-04-28 02:13:31 -0700190#endif
Yasuaki Ishimatsu46723bf2013-02-22 16:33:00 -0800191extern void put_page_bootmem(struct page *page);
192extern void get_page_bootmem(unsigned long ingo, struct page *page,
193 unsigned long type);
Yasunori Goto04753272008-04-28 02:13:31 -0700194
Vladimir Davydovbfc8c902014-06-04 16:07:18 -0700195void get_online_mems(void);
196void put_online_mems(void);
KOSAKI Motohiro20d6c962010-12-02 14:31:19 -0800197
David Rientjes30467e02015-04-14 15:45:11 -0700198void mem_hotplug_begin(void);
199void mem_hotplug_done(void);
200
Joonsoo Kim7cf91a92016-03-15 14:57:51 -0700201extern void set_zone_contiguous(struct zone *zone);
202extern void clear_zone_contiguous(struct zone *zone);
203
Dave Hansen208d54e2005-10-29 18:16:52 -0700204#else /* ! CONFIG_MEMORY_HOTPLUG */
205/*
206 * Stub functions for when hotplug is off
207 */
208static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
209static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
210static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
Dave Hansenbdc8cb92005-10-29 18:16:53 -0700211
212static inline unsigned zone_span_seqbegin(struct zone *zone)
213{
214 return 0;
215}
216static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
217{
218 return 0;
219}
220static inline void zone_span_writelock(struct zone *zone) {}
221static inline void zone_span_writeunlock(struct zone *zone) {}
222static inline void zone_seqlock_init(struct zone *zone) {}
Dave Hansen3947be12005-10-29 18:16:54 -0700223
224static inline int mhp_notimplemented(const char *func)
225{
226 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
227 dump_stack();
228 return -ENOSYS;
229}
230
Yasunori Goto04753272008-04-28 02:13:31 -0700231static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
232{
233}
234
Toshi Kani01b0f192013-11-12 15:07:25 -0800235static inline int try_online_node(int nid)
236{
237 return 0;
238}
239
Vladimir Davydovbfc8c902014-06-04 16:07:18 -0700240static inline void get_online_mems(void) {}
241static inline void put_online_mems(void) {}
KOSAKI Motohiro20d6c962010-12-02 14:31:19 -0800242
David Rientjes30467e02015-04-14 15:45:11 -0700243static inline void mem_hotplug_begin(void) {}
244static inline void mem_hotplug_done(void) {}
245
Dave Hansenbdc8cb92005-10-29 18:16:53 -0700246#endif /* ! CONFIG_MEMORY_HOTPLUG */
Andi Kleen9d99aaa2006-04-07 19:49:15 +0200247
Badari Pulavarty5c755e92008-07-23 21:28:19 -0700248#ifdef CONFIG_MEMORY_HOTREMOVE
249
Yaowei Baic98940f2016-05-19 17:11:26 -0700250extern bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
Wen Congyang90b30cd2013-02-22 16:33:27 -0800251extern void try_offline_node(int nid);
Rafael J. Wysockiaba6efc2013-06-01 22:24:07 +0200252extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
253extern void remove_memory(int nid, u64 start, u64 size);
Badari Pulavarty5c755e92008-07-23 21:28:19 -0700254
255#else
Yaowei Baic98940f2016-05-19 17:11:26 -0700256static inline bool is_mem_section_removable(unsigned long pfn,
Badari Pulavarty5c755e92008-07-23 21:28:19 -0700257 unsigned long nr_pages)
258{
Yaowei Baic98940f2016-05-19 17:11:26 -0700259 return false;
Badari Pulavarty5c755e92008-07-23 21:28:19 -0700260}
Wen Congyang90b30cd2013-02-22 16:33:27 -0800261
262static inline void try_offline_node(int nid) {}
Rafael J. Wysockiaba6efc2013-06-01 22:24:07 +0200263
264static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
265{
266 return -EINVAL;
267}
268
269static inline void remove_memory(int nid, u64 start, u64 size) {}
Badari Pulavarty5c755e92008-07-23 21:28:19 -0700270#endif /* CONFIG_MEMORY_HOTREMOVE */
271
Rafael J. Wysockie2ff3942013-05-08 00:29:49 +0200272extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
273 void *arg, int (*func)(struct memory_block *, void *));
Yasunori Gotobc02af92006-06-27 02:53:30 -0700274extern int add_memory(int nid, u64 start, u64 size);
Vitaly Kuznetsov31bc3852016-03-15 14:56:48 -0700275extern int add_memory_resource(int nid, struct resource *resource, bool online);
Dan Williams033fbae2015-08-09 15:29:06 -0400276extern int zone_for_memory(int nid, u64 start, u64 size, int zone_default,
277 bool for_device);
278extern int arch_add_memory(int nid, u64 start, u64 size, bool for_device);
Wen Congyanga16cee12012-10-08 16:33:58 -0700279extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
Yasuaki Ishimatsu6677e3e2013-02-22 16:32:52 -0800280extern bool is_memblock_offlined(struct memory_block *mem);
Rafael J. Wysocki242831e2013-05-27 12:58:46 +0200281extern void remove_memory(int nid, u64 start, u64 size);
Zhang Yanfei85b35fe2013-11-12 15:07:42 -0800282extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn);
Dan Williams4b94ffd2016-01-15 16:56:22 -0800283extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms,
284 unsigned long map_offset);
Yasunori Goto04753272008-04-28 02:13:31 -0700285extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
286 unsigned long pnum);
Andi Kleen9d99aaa2006-04-07 19:49:15 +0200287
Dave Hansen208d54e2005-10-29 18:16:52 -0700288#endif /* __LINUX_MEMORY_HOTPLUG_H */