1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __LINUX_MEMORY_HOTPLUG_H
3 #define __LINUX_MEMORY_HOTPLUG_H
5 #include <linux/mmzone.h>
6 #include <linux/spinlock.h>
7 #include <linux/notifier.h>
17 #ifdef CONFIG_MEMORY_HOTPLUG
19 * Return page for the valid pfn only if the page is online. All pfn
20 * walkers which rely on the fully initialized page->flags and others
21 * should use this rather than pfn_valid && pfn_to_page
23 #define pfn_to_online_page(pfn) \
25 struct page *___page = NULL; \
26 unsigned long ___nr = pfn_to_section_nr(pfn); \
28 if (___nr < NR_MEM_SECTIONS && online_section_nr(___nr))\
29 ___page = pfn_to_page(pfn); \
34 * Types for free bootmem stored in page->lru.next. These have to be in
35 * some random range in unsigned long space for debugging purposes.
38 MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12,
39 SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE,
42 MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO,
45 /* Types for control the zone type of onlined and offlined memory */
54 * pgdat resizing functions
57 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
59 spin_lock_irqsave(&pgdat->node_size_lock, *flags);
62 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
64 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
67 void pgdat_resize_init(struct pglist_data *pgdat)
69 spin_lock_init(&pgdat->node_size_lock);
72 * Zone resizing functions
74 * Note: any attempt to resize a zone should has pgdat_resize_lock()
75 * zone_span_writelock() both held. This ensure the size of a zone
76 * can't be changed while pgdat_resize_lock() held.
78 static inline unsigned zone_span_seqbegin(struct zone *zone)
80 return read_seqbegin(&zone->span_seqlock);
82 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
84 return read_seqretry(&zone->span_seqlock, iv);
86 static inline void zone_span_writelock(struct zone *zone)
88 write_seqlock(&zone->span_seqlock);
90 static inline void zone_span_writeunlock(struct zone *zone)
92 write_sequnlock(&zone->span_seqlock);
94 static inline void zone_seqlock_init(struct zone *zone)
96 seqlock_init(&zone->span_seqlock);
98 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
99 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
100 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
101 /* VM interface that may be used by firmware interface */
102 extern int online_pages(unsigned long, unsigned long, int);
103 extern int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn,
104 unsigned long *valid_start, unsigned long *valid_end);
105 extern void __offline_isolated_pages(unsigned long, unsigned long);
107 typedef void (*online_page_callback_t)(struct page *page);
109 extern int set_online_page_callback(online_page_callback_t callback);
110 extern int restore_online_page_callback(online_page_callback_t callback);
112 extern void __online_page_set_limits(struct page *page);
113 extern void __online_page_increment_counters(struct page *page);
114 extern void __online_page_free(struct page *page);
116 extern int try_online_node(int nid);
118 extern bool memhp_auto_online;
119 /* If movable_node boot option specified */
120 extern bool movable_node_enabled;
121 static inline bool movable_node_is_enabled(void)
123 return movable_node_enabled;
126 #ifdef CONFIG_MEMORY_HOTREMOVE
127 extern bool is_pageblock_removable_nolock(struct page *page);
128 extern int arch_remove_memory(u64 start, u64 size);
129 extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
130 unsigned long nr_pages);
131 #endif /* CONFIG_MEMORY_HOTREMOVE */
133 /* reasonably generic interface to expand the physical pages */
134 extern int __add_pages(int nid, unsigned long start_pfn,
135 unsigned long nr_pages, bool want_memblock);
137 #ifndef CONFIG_ARCH_HAS_ADD_PAGES
138 static inline int add_pages(int nid, unsigned long start_pfn,
139 unsigned long nr_pages, bool want_memblock)
141 return __add_pages(nid, start_pfn, nr_pages, want_memblock);
143 #else /* ARCH_HAS_ADD_PAGES */
144 int add_pages(int nid, unsigned long start_pfn,
145 unsigned long nr_pages, bool want_memblock);
146 #endif /* ARCH_HAS_ADD_PAGES */
149 extern int memory_add_physaddr_to_nid(u64 start);
151 static inline int memory_add_physaddr_to_nid(u64 start)
157 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
159 * For supporting node-hotadd, we have to allocate a new pgdat.
161 * If an arch has generic style NODE_DATA(),
162 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
164 * In general, generic_alloc_nodedata() is used.
165 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
168 extern pg_data_t *arch_alloc_nodedata(int nid);
169 extern void arch_free_nodedata(pg_data_t *pgdat);
170 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
172 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
174 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
175 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
179 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
180 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
181 * Because, pgdat for the new node is not allocated/initialized yet itself.
182 * To use new node's memory, more consideration will be necessary.
184 #define generic_alloc_nodedata(nid) \
186 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
189 * This definition is just for error path in node hotadd.
190 * For node hotremove, we have to replace this.
192 #define generic_free_nodedata(pgdat) kfree(pgdat)
194 extern pg_data_t *node_data[];
195 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
197 node_data[nid] = pgdat;
200 #else /* !CONFIG_NUMA */
203 static inline pg_data_t *generic_alloc_nodedata(int nid)
208 static inline void generic_free_nodedata(pg_data_t *pgdat)
211 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
214 #endif /* CONFIG_NUMA */
215 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
217 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
218 extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat);
220 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
224 extern void put_page_bootmem(struct page *page);
225 extern void get_page_bootmem(unsigned long ingo, struct page *page,
228 void get_online_mems(void);
229 void put_online_mems(void);
231 void mem_hotplug_begin(void);
232 void mem_hotplug_done(void);
234 extern void set_zone_contiguous(struct zone *zone);
235 extern void clear_zone_contiguous(struct zone *zone);
237 #else /* ! CONFIG_MEMORY_HOTPLUG */
238 #define pfn_to_online_page(pfn) \
240 struct page *___page = NULL; \
241 if (pfn_valid(pfn)) \
242 ___page = pfn_to_page(pfn); \
247 * Stub functions for when hotplug is off
249 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
250 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
251 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
253 static inline unsigned zone_span_seqbegin(struct zone *zone)
257 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
261 static inline void zone_span_writelock(struct zone *zone) {}
262 static inline void zone_span_writeunlock(struct zone *zone) {}
263 static inline void zone_seqlock_init(struct zone *zone) {}
265 static inline int mhp_notimplemented(const char *func)
267 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
272 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
276 static inline int try_online_node(int nid)
281 static inline void get_online_mems(void) {}
282 static inline void put_online_mems(void) {}
284 static inline void mem_hotplug_begin(void) {}
285 static inline void mem_hotplug_done(void) {}
287 static inline bool movable_node_is_enabled(void)
291 #endif /* ! CONFIG_MEMORY_HOTPLUG */
293 #ifdef CONFIG_MEMORY_HOTREMOVE
295 extern bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
296 extern void try_offline_node(int nid);
297 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
298 extern void remove_memory(int nid, u64 start, u64 size);
301 static inline bool is_mem_section_removable(unsigned long pfn,
302 unsigned long nr_pages)
307 static inline void try_offline_node(int nid) {}
309 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
314 static inline void remove_memory(int nid, u64 start, u64 size) {}
315 #endif /* CONFIG_MEMORY_HOTREMOVE */
317 extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
318 void *arg, int (*func)(struct memory_block *, void *));
319 extern int add_memory(int nid, u64 start, u64 size);
320 extern int add_memory_resource(int nid, struct resource *resource, bool online);
321 extern int arch_add_memory(int nid, u64 start, u64 size, bool want_memblock);
322 extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
323 unsigned long nr_pages);
324 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
325 extern bool is_memblock_offlined(struct memory_block *mem);
326 extern void remove_memory(int nid, u64 start, u64 size);
327 extern int sparse_add_one_section(struct pglist_data *pgdat, unsigned long start_pfn);
328 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms,
329 unsigned long map_offset);
330 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
332 extern bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long nr_pages,
334 extern struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn,
335 unsigned long nr_pages);
336 #endif /* __LINUX_MEMORY_HOTPLUG_H */