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Linux/include/linux/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 
 14 #ifdef CONFIG_MEMORY_HOTPLUG
 15 
 16 /*
 17  * Types for free bootmem stored in page->lru.next. These have to be in
 18  * some random range in unsigned long space for debugging purposes.
 19  */
 20 enum {
 21         MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12,
 22         SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE,
 23         MIX_SECTION_INFO,
 24         NODE_INFO,
 25         MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO,
 26 };
 27 
 28 /*
 29  * pgdat resizing functions
 30  */
 31 static inline
 32 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
 33 {
 34         spin_lock_irqsave(&pgdat->node_size_lock, *flags);
 35 }
 36 static inline
 37 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
 38 {
 39         spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
 40 }
 41 static inline
 42 void pgdat_resize_init(struct pglist_data *pgdat)
 43 {
 44         spin_lock_init(&pgdat->node_size_lock);
 45 }
 46 /*
 47  * Zone resizing functions
 48  */
 49 static inline unsigned zone_span_seqbegin(struct zone *zone)
 50 {
 51         return read_seqbegin(&zone->span_seqlock);
 52 }
 53 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
 54 {
 55         return read_seqretry(&zone->span_seqlock, iv);
 56 }
 57 static inline void zone_span_writelock(struct zone *zone)
 58 {
 59         write_seqlock(&zone->span_seqlock);
 60 }
 61 static inline void zone_span_writeunlock(struct zone *zone)
 62 {
 63         write_sequnlock(&zone->span_seqlock);
 64 }
 65 static inline void zone_seqlock_init(struct zone *zone)
 66 {
 67         seqlock_init(&zone->span_seqlock);
 68 }
 69 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
 70 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
 71 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
 72 /* VM interface that may be used by firmware interface */
 73 extern int online_pages(unsigned long, unsigned long);
 74 extern void __offline_isolated_pages(unsigned long, unsigned long);
 75 
 76 typedef void (*online_page_callback_t)(struct page *page);
 77 
 78 extern int set_online_page_callback(online_page_callback_t callback);
 79 extern int restore_online_page_callback(online_page_callback_t callback);
 80 
 81 extern void __online_page_set_limits(struct page *page);
 82 extern void __online_page_increment_counters(struct page *page);
 83 extern void __online_page_free(struct page *page);
 84 
 85 #ifdef CONFIG_MEMORY_HOTREMOVE
 86 extern bool is_pageblock_removable_nolock(struct page *page);
 87 #endif /* CONFIG_MEMORY_HOTREMOVE */
 88 
 89 /* reasonably generic interface to expand the physical pages in a zone  */
 90 extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn,
 91         unsigned long nr_pages);
 92 extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
 93         unsigned long nr_pages);
 94 
 95 #ifdef CONFIG_NUMA
 96 extern int memory_add_physaddr_to_nid(u64 start);
 97 #else
 98 static inline int memory_add_physaddr_to_nid(u64 start)
 99 {
100         return 0;
101 }
102 #endif
103 
104 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
105 /*
106  * For supporting node-hotadd, we have to allocate a new pgdat.
107  *
108  * If an arch has generic style NODE_DATA(),
109  * node_data[nid] = kzalloc() works well. But it depends on the architecture.
110  *
111  * In general, generic_alloc_nodedata() is used.
112  * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
113  *
114  */
115 extern pg_data_t *arch_alloc_nodedata(int nid);
116 extern void arch_free_nodedata(pg_data_t *pgdat);
117 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
118 
119 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
120 
121 #define arch_alloc_nodedata(nid)        generic_alloc_nodedata(nid)
122 #define arch_free_nodedata(pgdat)       generic_free_nodedata(pgdat)
123 
124 #ifdef CONFIG_NUMA
125 /*
126  * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
127  * XXX: kmalloc_node() can't work well to get new node's memory at this time.
128  *      Because, pgdat for the new node is not allocated/initialized yet itself.
129  *      To use new node's memory, more consideration will be necessary.
130  */
131 #define generic_alloc_nodedata(nid)                             \
132 ({                                                              \
133         kzalloc(sizeof(pg_data_t), GFP_KERNEL);                 \
134 })
135 /*
136  * This definition is just for error path in node hotadd.
137  * For node hotremove, we have to replace this.
138  */
139 #define generic_free_nodedata(pgdat)    kfree(pgdat)
140 
141 extern pg_data_t *node_data[];
142 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
143 {
144         node_data[nid] = pgdat;
145 }
146 
147 #else /* !CONFIG_NUMA */
148 
149 /* never called */
150 static inline pg_data_t *generic_alloc_nodedata(int nid)
151 {
152         BUG();
153         return NULL;
154 }
155 static inline void generic_free_nodedata(pg_data_t *pgdat)
156 {
157 }
158 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
159 {
160 }
161 #endif /* CONFIG_NUMA */
162 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
163 
164 #ifdef CONFIG_SPARSEMEM_VMEMMAP
165 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
166 {
167 }
168 static inline void put_page_bootmem(struct page *page)
169 {
170 }
171 #else
172 extern void register_page_bootmem_info_node(struct pglist_data *pgdat);
173 extern void put_page_bootmem(struct page *page);
174 #endif
175 
176 /*
177  * Lock for memory hotplug guarantees 1) all callbacks for memory hotplug
178  * notifier will be called under this. 2) offline/online/add/remove memory
179  * will not run simultaneously.
180  */
181 
182 void lock_memory_hotplug(void);
183 void unlock_memory_hotplug(void);
184 
185 #else /* ! CONFIG_MEMORY_HOTPLUG */
186 /*
187  * Stub functions for when hotplug is off
188  */
189 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
190 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
191 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
192 
193 static inline unsigned zone_span_seqbegin(struct zone *zone)
194 {
195         return 0;
196 }
197 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
198 {
199         return 0;
200 }
201 static inline void zone_span_writelock(struct zone *zone) {}
202 static inline void zone_span_writeunlock(struct zone *zone) {}
203 static inline void zone_seqlock_init(struct zone *zone) {}
204 
205 static inline int mhp_notimplemented(const char *func)
206 {
207         printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
208         dump_stack();
209         return -ENOSYS;
210 }
211 
212 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
213 {
214 }
215 
216 static inline void lock_memory_hotplug(void) {}
217 static inline void unlock_memory_hotplug(void) {}
218 
219 #endif /* ! CONFIG_MEMORY_HOTPLUG */
220 
221 #ifdef CONFIG_MEMORY_HOTREMOVE
222 
223 extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
224 
225 #else
226 static inline int is_mem_section_removable(unsigned long pfn,
227                                         unsigned long nr_pages)
228 {
229         return 0;
230 }
231 #endif /* CONFIG_MEMORY_HOTREMOVE */
232 
233 extern int mem_online_node(int nid);
234 extern int add_memory(int nid, u64 start, u64 size);
235 extern int arch_add_memory(int nid, u64 start, u64 size);
236 extern int remove_memory(u64 start, u64 size);
237 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
238                                                                 int nr_pages);
239 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms);
240 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
241                                           unsigned long pnum);
242 
243 #endif /* __LINUX_MEMORY_HOTPLUG_H */
244 

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