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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 struct memory_block;
 14 struct resource;
 15 
 16 #ifdef CONFIG_MEMORY_HOTPLUG
 17 
 18 /*
 19  * 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.
 21  */
 22 enum {
 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 };
 29 
 30 /* Types for control the zone type of onlined and offlined memory */
 31 enum {
 32         MMOP_OFFLINE = -1,
 33         MMOP_ONLINE_KEEP,
 34         MMOP_ONLINE_KERNEL,
 35         MMOP_ONLINE_MOVABLE,
 36 };
 37 
 38 /*
 39  * pgdat resizing functions
 40  */
 41 static inline
 42 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
 43 {
 44         spin_lock_irqsave(&pgdat->node_size_lock, *flags);
 45 }
 46 static inline
 47 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
 48 {
 49         spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
 50 }
 51 static inline
 52 void pgdat_resize_init(struct pglist_data *pgdat)
 53 {
 54         spin_lock_init(&pgdat->node_size_lock);
 55 }
 56 /*
 57  * Zone resizing functions
 58  *
 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.
 62  */
 63 static inline unsigned zone_span_seqbegin(struct zone *zone)
 64 {
 65         return read_seqbegin(&zone->span_seqlock);
 66 }
 67 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
 68 {
 69         return read_seqretry(&zone->span_seqlock, iv);
 70 }
 71 static inline void zone_span_writelock(struct zone *zone)
 72 {
 73         write_seqlock(&zone->span_seqlock);
 74 }
 75 static inline void zone_span_writeunlock(struct zone *zone)
 76 {
 77         write_sequnlock(&zone->span_seqlock);
 78 }
 79 static inline void zone_seqlock_init(struct zone *zone)
 80 {
 81         seqlock_init(&zone->span_seqlock);
 82 }
 83 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
 84 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
 85 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
 86 /* VM interface that may be used by firmware interface */
 87 extern int online_pages(unsigned long, unsigned long, int);
 88 extern int test_pages_in_a_zone(unsigned long, unsigned long);
 89 extern void __offline_isolated_pages(unsigned long, unsigned long);
 90 
 91 typedef void (*online_page_callback_t)(struct page *page);
 92 
 93 extern int set_online_page_callback(online_page_callback_t callback);
 94 extern int restore_online_page_callback(online_page_callback_t callback);
 95 
 96 extern void __online_page_set_limits(struct page *page);
 97 extern void __online_page_increment_counters(struct page *page);
 98 extern void __online_page_free(struct page *page);
 99 
100 extern int try_online_node(int nid);
101 
102 extern bool memhp_auto_online;
103 
104 #ifdef CONFIG_MEMORY_HOTREMOVE
105 extern bool is_pageblock_removable_nolock(struct page *page);
106 extern int arch_remove_memory(u64 start, u64 size);
107 extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
108         unsigned long nr_pages);
109 #endif /* CONFIG_MEMORY_HOTREMOVE */
110 
111 /* reasonably generic interface to expand the physical pages in a zone  */
112 extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn,
113         unsigned long nr_pages);
114 
115 #ifdef CONFIG_NUMA
116 extern int memory_add_physaddr_to_nid(u64 start);
117 #else
118 static inline int memory_add_physaddr_to_nid(u64 start)
119 {
120         return 0;
121 }
122 #endif
123 
124 #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  */
135 extern pg_data_t *arch_alloc_nodedata(int nid);
136 extern void arch_free_nodedata(pg_data_t *pgdat);
137 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
138 
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 
161 extern pg_data_t *node_data[];
162 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
163 {
164         node_data[nid] = pgdat;
165 }
166 
167 #else /* !CONFIG_NUMA */
168 
169 /* never called */
170 static inline pg_data_t *generic_alloc_nodedata(int nid)
171 {
172         BUG();
173         return NULL;
174 }
175 static inline void generic_free_nodedata(pg_data_t *pgdat)
176 {
177 }
178 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
179 {
180 }
181 #endif /* CONFIG_NUMA */
182 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
183 
184 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
185 extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat);
186 #else
187 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
188 {
189 }
190 #endif
191 extern void put_page_bootmem(struct page *page);
192 extern void get_page_bootmem(unsigned long ingo, struct page *page,
193                              unsigned long type);
194 
195 void get_online_mems(void);
196 void put_online_mems(void);
197 
198 void mem_hotplug_begin(void);
199 void mem_hotplug_done(void);
200 
201 extern void set_zone_contiguous(struct zone *zone);
202 extern void clear_zone_contiguous(struct zone *zone);
203 
204 #else /* ! CONFIG_MEMORY_HOTPLUG */
205 /*
206  * Stub functions for when hotplug is off
207  */
208 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
209 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
210 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
211 
212 static inline unsigned zone_span_seqbegin(struct zone *zone)
213 {
214         return 0;
215 }
216 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
217 {
218         return 0;
219 }
220 static inline void zone_span_writelock(struct zone *zone) {}
221 static inline void zone_span_writeunlock(struct zone *zone) {}
222 static inline void zone_seqlock_init(struct zone *zone) {}
223 
224 static 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 
231 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
232 {
233 }
234 
235 static inline int try_online_node(int nid)
236 {
237         return 0;
238 }
239 
240 static inline void get_online_mems(void) {}
241 static inline void put_online_mems(void) {}
242 
243 static inline void mem_hotplug_begin(void) {}
244 static inline void mem_hotplug_done(void) {}
245 
246 #endif /* ! CONFIG_MEMORY_HOTPLUG */
247 
248 #ifdef CONFIG_MEMORY_HOTREMOVE
249 
250 extern bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
251 extern void try_offline_node(int nid);
252 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
253 extern void remove_memory(int nid, u64 start, u64 size);
254 
255 #else
256 static inline bool is_mem_section_removable(unsigned long pfn,
257                                         unsigned long nr_pages)
258 {
259         return false;
260 }
261 
262 static inline void try_offline_node(int nid) {}
263 
264 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
265 {
266         return -EINVAL;
267 }
268 
269 static inline void remove_memory(int nid, u64 start, u64 size) {}
270 #endif /* CONFIG_MEMORY_HOTREMOVE */
271 
272 extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
273                 void *arg, int (*func)(struct memory_block *, void *));
274 extern int add_memory(int nid, u64 start, u64 size);
275 extern int add_memory_resource(int nid, struct resource *resource, bool online);
276 extern int zone_for_memory(int nid, u64 start, u64 size, int zone_default,
277                 bool for_device);
278 extern int arch_add_memory(int nid, u64 start, u64 size, bool for_device);
279 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
280 extern bool is_memblock_offlined(struct memory_block *mem);
281 extern void remove_memory(int nid, u64 start, u64 size);
282 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn);
283 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms,
284                 unsigned long map_offset);
285 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
286                                           unsigned long pnum);
287 
288 #endif /* __LINUX_MEMORY_HOTPLUG_H */
289 

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