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TOMOYO Linux Cross Reference
Linux/include/linux/memory_hotplug.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef __LINUX_MEMORY_HOTPLUG_H
  3 #define __LINUX_MEMORY_HOTPLUG_H
  4 
  5 #include <linux/mmzone.h>
  6 #include <linux/spinlock.h>
  7 #include <linux/notifier.h>
  8 #include <linux/bug.h>
  9 
 10 struct page;
 11 struct zone;
 12 struct pglist_data;
 13 struct mem_section;
 14 struct memory_block;
 15 struct resource;
 16 struct vmem_altmap;
 17 
 18 #ifdef CONFIG_MEMORY_HOTPLUG
 19 /*
 20  * Return page for the valid pfn only if the page is online. All pfn
 21  * walkers which rely on the fully initialized page->flags and others
 22  * should use this rather than pfn_valid && pfn_to_page
 23  */
 24 #define pfn_to_online_page(pfn)                                    \
 25 ({                                                                 \
 26         struct page *___page = NULL;                               \
 27         unsigned long ___pfn = pfn;                                \
 28         unsigned long ___nr = pfn_to_section_nr(___pfn);           \
 29                                                                    \
 30         if (___nr < NR_MEM_SECTIONS && online_section_nr(___nr) && \
 31             pfn_valid_within(___pfn))                              \
 32                 ___page = pfn_to_page(___pfn);                     \
 33         ___page;                                                   \
 34 })
 35 
 36 /*
 37  * Types for free bootmem stored in page->lru.next. These have to be in
 38  * some random range in unsigned long space for debugging purposes.
 39  */
 40 enum {
 41         MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12,
 42         SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE,
 43         MIX_SECTION_INFO,
 44         NODE_INFO,
 45         MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO,
 46 };
 47 
 48 /* Types for control the zone type of onlined and offlined memory */
 49 enum {
 50         MMOP_OFFLINE = -1,
 51         MMOP_ONLINE_KEEP,
 52         MMOP_ONLINE_KERNEL,
 53         MMOP_ONLINE_MOVABLE,
 54 };
 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 start_pfn, unsigned long end_pfn,
 89         unsigned long *valid_start, unsigned long *valid_end);
 90 extern void __offline_isolated_pages(unsigned long, unsigned long);
 91 
 92 typedef void (*online_page_callback_t)(struct page *page, unsigned int order);
 93 
 94 extern int set_online_page_callback(online_page_callback_t callback);
 95 extern int restore_online_page_callback(online_page_callback_t callback);
 96 
 97 extern void __online_page_set_limits(struct page *page);
 98 extern void __online_page_increment_counters(struct page *page);
 99 extern void __online_page_free(struct page *page);
100 
101 extern int try_online_node(int nid);
102 
103 extern u64 max_mem_size;
104 
105 extern bool memhp_auto_online;
106 /* If movable_node boot option specified */
107 extern bool movable_node_enabled;
108 static inline bool movable_node_is_enabled(void)
109 {
110         return movable_node_enabled;
111 }
112 
113 #ifdef CONFIG_MEMORY_HOTREMOVE
114 extern int arch_remove_memory(int nid, u64 start, u64 size,
115                                 struct vmem_altmap *altmap);
116 extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
117         unsigned long nr_pages, struct vmem_altmap *altmap);
118 #endif /* CONFIG_MEMORY_HOTREMOVE */
119 
120 /* reasonably generic interface to expand the physical pages */
121 extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
122                 struct vmem_altmap *altmap, bool want_memblock);
123 
124 #ifndef CONFIG_ARCH_HAS_ADD_PAGES
125 static inline int add_pages(int nid, unsigned long start_pfn,
126                 unsigned long nr_pages, struct vmem_altmap *altmap,
127                 bool want_memblock)
128 {
129         return __add_pages(nid, start_pfn, nr_pages, altmap, want_memblock);
130 }
131 #else /* ARCH_HAS_ADD_PAGES */
132 int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
133                 struct vmem_altmap *altmap, bool want_memblock);
134 #endif /* ARCH_HAS_ADD_PAGES */
135 
136 #ifdef CONFIG_NUMA
137 extern int memory_add_physaddr_to_nid(u64 start);
138 #else
139 static inline int memory_add_physaddr_to_nid(u64 start)
140 {
141         return 0;
142 }
143 #endif
144 
145 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
146 /*
147  * For supporting node-hotadd, we have to allocate a new pgdat.
148  *
149  * If an arch has generic style NODE_DATA(),
150  * node_data[nid] = kzalloc() works well. But it depends on the architecture.
151  *
152  * In general, generic_alloc_nodedata() is used.
153  * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
154  *
155  */
156 extern pg_data_t *arch_alloc_nodedata(int nid);
157 extern void arch_free_nodedata(pg_data_t *pgdat);
158 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
159 
160 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
161 
162 #define arch_alloc_nodedata(nid)        generic_alloc_nodedata(nid)
163 #define arch_free_nodedata(pgdat)       generic_free_nodedata(pgdat)
164 
165 #ifdef CONFIG_NUMA
166 /*
167  * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
168  * XXX: kmalloc_node() can't work well to get new node's memory at this time.
169  *      Because, pgdat for the new node is not allocated/initialized yet itself.
170  *      To use new node's memory, more consideration will be necessary.
171  */
172 #define generic_alloc_nodedata(nid)                             \
173 ({                                                              \
174         kzalloc(sizeof(pg_data_t), GFP_KERNEL);                 \
175 })
176 /*
177  * This definition is just for error path in node hotadd.
178  * For node hotremove, we have to replace this.
179  */
180 #define generic_free_nodedata(pgdat)    kfree(pgdat)
181 
182 extern pg_data_t *node_data[];
183 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
184 {
185         node_data[nid] = pgdat;
186 }
187 
188 #else /* !CONFIG_NUMA */
189 
190 /* never called */
191 static inline pg_data_t *generic_alloc_nodedata(int nid)
192 {
193         BUG();
194         return NULL;
195 }
196 static inline void generic_free_nodedata(pg_data_t *pgdat)
197 {
198 }
199 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
200 {
201 }
202 #endif /* CONFIG_NUMA */
203 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
204 
205 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
206 extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat);
207 #else
208 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
209 {
210 }
211 #endif
212 extern void put_page_bootmem(struct page *page);
213 extern void get_page_bootmem(unsigned long ingo, struct page *page,
214                              unsigned long type);
215 
216 void get_online_mems(void);
217 void put_online_mems(void);
218 
219 void mem_hotplug_begin(void);
220 void mem_hotplug_done(void);
221 
222 extern void set_zone_contiguous(struct zone *zone);
223 extern void clear_zone_contiguous(struct zone *zone);
224 
225 #else /* ! CONFIG_MEMORY_HOTPLUG */
226 #define pfn_to_online_page(pfn)                 \
227 ({                                              \
228         struct page *___page = NULL;            \
229         if (pfn_valid(pfn))                     \
230                 ___page = pfn_to_page(pfn);     \
231         ___page;                                \
232  })
233 
234 static inline unsigned zone_span_seqbegin(struct zone *zone)
235 {
236         return 0;
237 }
238 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
239 {
240         return 0;
241 }
242 static inline void zone_span_writelock(struct zone *zone) {}
243 static inline void zone_span_writeunlock(struct zone *zone) {}
244 static inline void zone_seqlock_init(struct zone *zone) {}
245 
246 static inline int mhp_notimplemented(const char *func)
247 {
248         printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
249         dump_stack();
250         return -ENOSYS;
251 }
252 
253 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
254 {
255 }
256 
257 static inline int try_online_node(int nid)
258 {
259         return 0;
260 }
261 
262 static inline void get_online_mems(void) {}
263 static inline void put_online_mems(void) {}
264 
265 static inline void mem_hotplug_begin(void) {}
266 static inline void mem_hotplug_done(void) {}
267 
268 static inline bool movable_node_is_enabled(void)
269 {
270         return false;
271 }
272 #endif /* ! CONFIG_MEMORY_HOTPLUG */
273 
274 #if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT)
275 /*
276  * pgdat resizing functions
277  */
278 static inline
279 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
280 {
281         spin_lock_irqsave(&pgdat->node_size_lock, *flags);
282 }
283 static inline
284 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
285 {
286         spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
287 }
288 static inline
289 void pgdat_resize_init(struct pglist_data *pgdat)
290 {
291         spin_lock_init(&pgdat->node_size_lock);
292 }
293 #else /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
294 /*
295  * Stub functions for when hotplug is off
296  */
297 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
298 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
299 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
300 #endif /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
301 
302 #ifdef CONFIG_MEMORY_HOTREMOVE
303 
304 extern bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
305 extern void try_offline_node(int nid);
306 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
307 extern void remove_memory(int nid, u64 start, u64 size);
308 extern void __remove_memory(int nid, u64 start, u64 size);
309 
310 #else
311 static inline bool is_mem_section_removable(unsigned long pfn,
312                                         unsigned long nr_pages)
313 {
314         return false;
315 }
316 
317 static inline void try_offline_node(int nid) {}
318 
319 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
320 {
321         return -EINVAL;
322 }
323 
324 static inline void remove_memory(int nid, u64 start, u64 size) {}
325 static inline void __remove_memory(int nid, u64 start, u64 size) {}
326 #endif /* CONFIG_MEMORY_HOTREMOVE */
327 
328 extern void __ref free_area_init_core_hotplug(int nid);
329 extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
330                 void *arg, int (*func)(struct memory_block *, void *));
331 extern int __add_memory(int nid, u64 start, u64 size);
332 extern int add_memory(int nid, u64 start, u64 size);
333 extern int add_memory_resource(int nid, struct resource *resource);
334 extern int arch_add_memory(int nid, u64 start, u64 size,
335                 struct vmem_altmap *altmap, bool want_memblock);
336 extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
337                 unsigned long nr_pages, struct vmem_altmap *altmap);
338 extern bool is_memblock_offlined(struct memory_block *mem);
339 extern int sparse_add_one_section(int nid, unsigned long start_pfn,
340                                   struct vmem_altmap *altmap);
341 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms,
342                 unsigned long map_offset, struct vmem_altmap *altmap);
343 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
344                                           unsigned long pnum);
345 extern bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long nr_pages,
346                 int online_type);
347 extern struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn,
348                 unsigned long nr_pages);
349 #endif /* __LINUX_MEMORY_HOTPLUG_H */
350 

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