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>
18 #ifdef CONFIG_MEMORY_HOTPLUG
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
24 #define pfn_to_online_page(pfn) \
26 struct page *___page = NULL; \
27 unsigned long ___pfn = pfn; \
28 unsigned long ___nr = pfn_to_section_nr(___pfn); \
30 if (___nr < NR_MEM_SECTIONS && online_section_nr(___nr) && \
31 pfn_valid_within(___pfn)) \
32 ___page = pfn_to_page(___pfn); \
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.
41 MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12,
42 SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE,
45 MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO,
48 /* Types for control the zone type of onlined and offlined memory */
57 * Restrictions for the memory hotplug:
59 * altmap: alternative allocator for memmap array
61 struct mhp_restrictions {
63 struct vmem_altmap *altmap;
67 * Zone resizing functions
69 * Note: any attempt to resize a zone should has pgdat_resize_lock()
70 * zone_span_writelock() both held. This ensure the size of a zone
71 * can't be changed while pgdat_resize_lock() held.
73 static inline unsigned zone_span_seqbegin(struct zone *zone)
75 return read_seqbegin(&zone->span_seqlock);
77 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
79 return read_seqretry(&zone->span_seqlock, iv);
81 static inline void zone_span_writelock(struct zone *zone)
83 write_seqlock(&zone->span_seqlock);
85 static inline void zone_span_writeunlock(struct zone *zone)
87 write_sequnlock(&zone->span_seqlock);
89 static inline void zone_seqlock_init(struct zone *zone)
91 seqlock_init(&zone->span_seqlock);
93 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
94 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
95 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
96 /* VM interface that may be used by firmware interface */
97 extern int online_pages(unsigned long pfn, unsigned long nr_pages,
98 int online_type, int nid);
99 extern struct zone *test_pages_in_a_zone(unsigned long start_pfn,
100 unsigned long end_pfn);
101 extern unsigned long __offline_isolated_pages(unsigned long start_pfn,
102 unsigned long end_pfn);
104 typedef void (*online_page_callback_t)(struct page *page, unsigned int order);
106 extern void generic_online_page(struct page *page, unsigned int order);
107 extern int set_online_page_callback(online_page_callback_t callback);
108 extern int restore_online_page_callback(online_page_callback_t callback);
110 extern int try_online_node(int nid);
112 extern int arch_add_memory(int nid, u64 start, u64 size,
113 struct mhp_restrictions *restrictions);
114 extern u64 max_mem_size;
116 extern bool memhp_auto_online;
117 /* If movable_node boot option specified */
118 extern bool movable_node_enabled;
119 static inline bool movable_node_is_enabled(void)
121 return movable_node_enabled;
124 extern void arch_remove_memory(int nid, u64 start, u64 size,
125 struct vmem_altmap *altmap);
126 extern void __remove_pages(unsigned long start_pfn, unsigned long nr_pages,
127 struct vmem_altmap *altmap);
129 /* reasonably generic interface to expand the physical pages */
130 extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
131 struct mhp_restrictions *restrictions);
133 #ifndef CONFIG_ARCH_HAS_ADD_PAGES
134 static inline int add_pages(int nid, unsigned long start_pfn,
135 unsigned long nr_pages, struct mhp_restrictions *restrictions)
137 return __add_pages(nid, start_pfn, nr_pages, restrictions);
139 #else /* ARCH_HAS_ADD_PAGES */
140 int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
141 struct mhp_restrictions *restrictions);
142 #endif /* ARCH_HAS_ADD_PAGES */
145 extern int memory_add_physaddr_to_nid(u64 start);
147 static inline int memory_add_physaddr_to_nid(u64 start)
153 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
155 * For supporting node-hotadd, we have to allocate a new pgdat.
157 * If an arch has generic style NODE_DATA(),
158 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
160 * In general, generic_alloc_nodedata() is used.
161 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
164 extern pg_data_t *arch_alloc_nodedata(int nid);
165 extern void arch_free_nodedata(pg_data_t *pgdat);
166 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
168 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
170 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
171 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
175 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
176 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
177 * Because, pgdat for the new node is not allocated/initialized yet itself.
178 * To use new node's memory, more consideration will be necessary.
180 #define generic_alloc_nodedata(nid) \
182 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
185 * This definition is just for error path in node hotadd.
186 * For node hotremove, we have to replace this.
188 #define generic_free_nodedata(pgdat) kfree(pgdat)
190 extern pg_data_t *node_data[];
191 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
193 node_data[nid] = pgdat;
196 #else /* !CONFIG_NUMA */
199 static inline pg_data_t *generic_alloc_nodedata(int nid)
204 static inline void generic_free_nodedata(pg_data_t *pgdat)
207 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
210 #endif /* CONFIG_NUMA */
211 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
213 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
214 extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat);
216 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
220 extern void put_page_bootmem(struct page *page);
221 extern void get_page_bootmem(unsigned long ingo, struct page *page,
224 void get_online_mems(void);
225 void put_online_mems(void);
227 void mem_hotplug_begin(void);
228 void mem_hotplug_done(void);
230 #else /* ! CONFIG_MEMORY_HOTPLUG */
231 #define pfn_to_online_page(pfn) \
233 struct page *___page = NULL; \
234 if (pfn_valid(pfn)) \
235 ___page = pfn_to_page(pfn); \
239 static inline unsigned zone_span_seqbegin(struct zone *zone)
243 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
247 static inline void zone_span_writelock(struct zone *zone) {}
248 static inline void zone_span_writeunlock(struct zone *zone) {}
249 static inline void zone_seqlock_init(struct zone *zone) {}
251 static inline int mhp_notimplemented(const char *func)
253 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
258 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
262 static inline int try_online_node(int nid)
267 static inline void get_online_mems(void) {}
268 static inline void put_online_mems(void) {}
270 static inline void mem_hotplug_begin(void) {}
271 static inline void mem_hotplug_done(void) {}
273 static inline bool movable_node_is_enabled(void)
277 #endif /* ! CONFIG_MEMORY_HOTPLUG */
279 #if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT)
281 * pgdat resizing functions
284 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
286 spin_lock_irqsave(&pgdat->node_size_lock, *flags);
289 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
291 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
294 void pgdat_resize_init(struct pglist_data *pgdat)
296 spin_lock_init(&pgdat->node_size_lock);
298 #else /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
300 * Stub functions for when hotplug is off
302 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
303 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
304 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
305 #endif /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
307 #ifdef CONFIG_MEMORY_HOTREMOVE
309 extern bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
310 extern void try_offline_node(int nid);
311 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
312 extern int remove_memory(int nid, u64 start, u64 size);
313 extern void __remove_memory(int nid, u64 start, u64 size);
316 static inline bool is_mem_section_removable(unsigned long pfn,
317 unsigned long nr_pages)
322 static inline void try_offline_node(int nid) {}
324 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
329 static inline int remove_memory(int nid, u64 start, u64 size)
334 static inline void __remove_memory(int nid, u64 start, u64 size) {}
335 #endif /* CONFIG_MEMORY_HOTREMOVE */
337 extern void set_zone_contiguous(struct zone *zone);
338 extern void clear_zone_contiguous(struct zone *zone);
340 extern void __ref free_area_init_core_hotplug(int nid);
341 extern int __add_memory(int nid, u64 start, u64 size);
342 extern int add_memory(int nid, u64 start, u64 size);
343 extern int add_memory_resource(int nid, struct resource *resource);
344 extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
345 unsigned long nr_pages, struct vmem_altmap *altmap);
346 extern void remove_pfn_range_from_zone(struct zone *zone,
347 unsigned long start_pfn,
348 unsigned long nr_pages);
349 extern bool is_memblock_offlined(struct memory_block *mem);
350 extern int sparse_add_section(int nid, unsigned long pfn,
351 unsigned long nr_pages, struct vmem_altmap *altmap);
352 extern void sparse_remove_section(struct mem_section *ms,
353 unsigned long pfn, unsigned long nr_pages,
354 unsigned long map_offset, struct vmem_altmap *altmap);
355 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
357 extern bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long nr_pages,
359 extern struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn,
360 unsigned long nr_pages);
361 #endif /* __LINUX_MEMORY_HOTPLUG_H */