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memory_hotplug.h
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1 #ifndef __LINUX_MEMORY_HOTPLUG_H
2 #define __LINUX_MEMORY_HOTPLUG_H
3 
4 #include <linux/mmzone.h>
5 #include <linux/spinlock.h>
6 #include <linux/notifier.h>
7 #include <linux/bug.h>
8 
9 struct page;
10 struct zone;
11 struct pglist_data;
12 struct mem_section;
13 struct memory_block;
14 
15 #ifdef CONFIG_MEMORY_HOTPLUG
16 
17 /*
18  * 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.
20  */
21 enum {
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 };
28 
29 /*
30  * pgdat resizing functions
31  */
32 static inline
33 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
34 {
35  spin_lock_irqsave(&pgdat->node_size_lock, *flags);
36 }
37 static inline
38 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
39 {
40  spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
41 }
42 static inline
43 void pgdat_resize_init(struct pglist_data *pgdat)
44 {
45  spin_lock_init(&pgdat->node_size_lock);
46 }
47 /*
48  * Zone resizing functions
49  */
50 static inline unsigned zone_span_seqbegin(struct zone *zone)
51 {
52  return read_seqbegin(&zone->span_seqlock);
53 }
54 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
55 {
56  return read_seqretry(&zone->span_seqlock, iv);
57 }
58 static inline void zone_span_writelock(struct zone *zone)
59 {
60  write_seqlock(&zone->span_seqlock);
61 }
62 static inline void zone_span_writeunlock(struct zone *zone)
63 {
64  write_sequnlock(&zone->span_seqlock);
65 }
66 static inline void zone_seqlock_init(struct zone *zone)
67 {
68  seqlock_init(&zone->span_seqlock);
69 }
70 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
71 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
72 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
73 /* VM interface that may be used by firmware interface */
74 extern int online_pages(unsigned long, unsigned long);
75 extern void __offline_isolated_pages(unsigned long, unsigned long);
76 
77 typedef void (*online_page_callback_t)(struct page *page);
78 
79 extern int set_online_page_callback(online_page_callback_t callback);
80 extern int restore_online_page_callback(online_page_callback_t callback);
81 
82 extern void __online_page_set_limits(struct page *page);
83 extern void __online_page_increment_counters(struct page *page);
84 extern void __online_page_free(struct page *page);
85 
86 #ifdef CONFIG_MEMORY_HOTREMOVE
87 extern bool is_pageblock_removable_nolock(struct page *page);
88 #endif /* CONFIG_MEMORY_HOTREMOVE */
89 
90 /* reasonably generic interface to expand the physical pages in a zone */
91 extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn,
92  unsigned long nr_pages);
93 extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
94  unsigned long nr_pages);
95 
96 #ifdef CONFIG_NUMA
97 extern int memory_add_physaddr_to_nid(u64 start);
98 #else
99 static inline int memory_add_physaddr_to_nid(u64 start)
100 {
101  return 0;
102 }
103 #endif
104 
105 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
106 /*
107  * For supporting node-hotadd, we have to allocate a new pgdat.
108  *
109  * If an arch has generic style NODE_DATA(),
110  * node_data[nid] = kzalloc() works well. But it depends on the architecture.
111  *
112  * In general, generic_alloc_nodedata() is used.
113  * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
114  *
115  */
116 extern pg_data_t *arch_alloc_nodedata(int nid);
117 extern void arch_free_nodedata(pg_data_t *pgdat);
118 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
119 
120 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
121 
122 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
123 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
124 
125 #ifdef CONFIG_NUMA
126 /*
127  * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
128  * XXX: kmalloc_node() can't work well to get new node's memory at this time.
129  * Because, pgdat for the new node is not allocated/initialized yet itself.
130  * To use new node's memory, more consideration will be necessary.
131  */
132 #define generic_alloc_nodedata(nid) \
133 ({ \
134  kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
135 })
136 /*
137  * This definition is just for error path in node hotadd.
138  * For node hotremove, we have to replace this.
139  */
140 #define generic_free_nodedata(pgdat) kfree(pgdat)
141 
142 extern pg_data_t *node_data[];
143 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
144 {
145  node_data[nid] = pgdat;
146 }
147 
148 #else /* !CONFIG_NUMA */
149 
150 /* never called */
151 static inline pg_data_t *generic_alloc_nodedata(int nid)
152 {
153  BUG();
154  return NULL;
155 }
156 static inline void generic_free_nodedata(pg_data_t *pgdat)
157 {
158 }
159 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
160 {
161 }
162 #endif /* CONFIG_NUMA */
163 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
164 
165 #ifdef CONFIG_SPARSEMEM_VMEMMAP
166 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
167 {
168 }
169 static inline void put_page_bootmem(struct page *page)
170 {
171 }
172 #else
173 extern void register_page_bootmem_info_node(struct pglist_data *pgdat);
174 extern void put_page_bootmem(struct page *page);
175 #endif
176 
177 /*
178  * Lock for memory hotplug guarantees 1) all callbacks for memory hotplug
179  * notifier will be called under this. 2) offline/online/add/remove memory
180  * will not run simultaneously.
181  */
182 
183 void lock_memory_hotplug(void);
184 void unlock_memory_hotplug(void);
185 
186 #else /* ! CONFIG_MEMORY_HOTPLUG */
187 /*
188  * Stub functions for when hotplug is off
189  */
190 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
191 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
192 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
193 
194 static inline unsigned zone_span_seqbegin(struct zone *zone)
195 {
196  return 0;
197 }
198 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
199 {
200  return 0;
201 }
202 static inline void zone_span_writelock(struct zone *zone) {}
203 static inline void zone_span_writeunlock(struct zone *zone) {}
204 static inline void zone_seqlock_init(struct zone *zone) {}
205 
206 static inline int mhp_notimplemented(const char *func)
207 {
208  printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
209  dump_stack();
210  return -ENOSYS;
211 }
212 
213 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
214 {
215 }
216 
217 static inline void lock_memory_hotplug(void) {}
218 static inline void unlock_memory_hotplug(void) {}
219 
220 #endif /* ! CONFIG_MEMORY_HOTPLUG */
221 
222 #ifdef CONFIG_MEMORY_HOTREMOVE
223 
224 extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
225 
226 #else
227 static inline int is_mem_section_removable(unsigned long pfn,
228  unsigned long nr_pages)
229 {
230  return 0;
231 }
232 #endif /* CONFIG_MEMORY_HOTREMOVE */
233 
234 extern int mem_online_node(int nid);
235 extern int add_memory(int nid, u64 start, u64 size);
236 extern int arch_add_memory(int nid, u64 start, u64 size);
237 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
238 extern int offline_memory_block(struct memory_block *mem);
239 extern int remove_memory(u64 start, u64 size);
240 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
241  int nr_pages);
242 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms);
243 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
244  unsigned long pnum);
245 
246 #endif /* __LINUX_MEMORY_HOTPLUG_H */