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, unsigned long, int);
98 extern int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn,
99 unsigned long *valid_start, unsigned long *valid_end);
100 extern unsigned long __offline_isolated_pages(unsigned long start_pfn,
101 unsigned long end_pfn);
103 typedef void (*online_page_callback_t)(struct page *page, unsigned int order);
105 extern void generic_online_page(struct page *page, unsigned int order);
106 extern int set_online_page_callback(online_page_callback_t callback);
107 extern int restore_online_page_callback(online_page_callback_t callback);
109 extern void __online_page_set_limits(struct page *page);
111 extern int try_online_node(int nid);
113 extern int arch_add_memory(int nid, u64 start, u64 size,
114 struct mhp_restrictions *restrictions);
115 extern u64 max_mem_size;
117 extern bool memhp_auto_online;
118 /* If movable_node boot option specified */
119 extern bool movable_node_enabled;
120 static inline bool movable_node_is_enabled(void)
122 return movable_node_enabled;
125 extern void arch_remove_memory(int nid, u64 start, u64 size,
126 struct vmem_altmap *altmap);
127 extern void __remove_pages(struct zone *zone, unsigned long start_pfn,
128 unsigned long nr_pages, struct vmem_altmap *altmap);
130 /* reasonably generic interface to expand the physical pages */
131 extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
132 struct mhp_restrictions *restrictions);
134 #ifndef CONFIG_ARCH_HAS_ADD_PAGES
135 static inline int add_pages(int nid, unsigned long start_pfn,
136 unsigned long nr_pages, struct mhp_restrictions *restrictions)
138 return __add_pages(nid, start_pfn, nr_pages, restrictions);
140 #else /* ARCH_HAS_ADD_PAGES */
141 int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
142 struct mhp_restrictions *restrictions);
143 #endif /* ARCH_HAS_ADD_PAGES */
146 extern int memory_add_physaddr_to_nid(u64 start);
148 static inline int memory_add_physaddr_to_nid(u64 start)
154 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
156 * For supporting node-hotadd, we have to allocate a new pgdat.
158 * If an arch has generic style NODE_DATA(),
159 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
161 * In general, generic_alloc_nodedata() is used.
162 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
165 extern pg_data_t *arch_alloc_nodedata(int nid);
166 extern void arch_free_nodedata(pg_data_t *pgdat);
167 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
169 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
171 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
172 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
176 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
177 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
178 * Because, pgdat for the new node is not allocated/initialized yet itself.
179 * To use new node's memory, more consideration will be necessary.
181 #define generic_alloc_nodedata(nid) \
183 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
186 * This definition is just for error path in node hotadd.
187 * For node hotremove, we have to replace this.
189 #define generic_free_nodedata(pgdat) kfree(pgdat)
191 extern pg_data_t *node_data[];
192 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
194 node_data[nid] = pgdat;
197 #else /* !CONFIG_NUMA */
200 static inline pg_data_t *generic_alloc_nodedata(int nid)
205 static inline void generic_free_nodedata(pg_data_t *pgdat)
208 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
211 #endif /* CONFIG_NUMA */
212 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
214 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
215 extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat);
217 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
221 extern void put_page_bootmem(struct page *page);
222 extern void get_page_bootmem(unsigned long ingo, struct page *page,
225 void get_online_mems(void);
226 void put_online_mems(void);
228 void mem_hotplug_begin(void);
229 void mem_hotplug_done(void);
231 #else /* ! CONFIG_MEMORY_HOTPLUG */
232 #define pfn_to_online_page(pfn) \
234 struct page *___page = NULL; \
235 if (pfn_valid(pfn)) \
236 ___page = pfn_to_page(pfn); \
240 static inline unsigned zone_span_seqbegin(struct zone *zone)
244 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
248 static inline void zone_span_writelock(struct zone *zone) {}
249 static inline void zone_span_writeunlock(struct zone *zone) {}
250 static inline void zone_seqlock_init(struct zone *zone) {}
252 static inline int mhp_notimplemented(const char *func)
254 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
259 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
263 static inline int try_online_node(int nid)
268 static inline void get_online_mems(void) {}
269 static inline void put_online_mems(void) {}
271 static inline void mem_hotplug_begin(void) {}
272 static inline void mem_hotplug_done(void) {}
274 static inline bool movable_node_is_enabled(void)
278 #endif /* ! CONFIG_MEMORY_HOTPLUG */
280 #if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT)
282 * pgdat resizing functions
285 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
287 spin_lock_irqsave(&pgdat->node_size_lock, *flags);
290 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
292 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
295 void pgdat_resize_init(struct pglist_data *pgdat)
297 spin_lock_init(&pgdat->node_size_lock);
299 #else /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
301 * Stub functions for when hotplug is off
303 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
304 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
305 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
306 #endif /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
308 #ifdef CONFIG_MEMORY_HOTREMOVE
310 extern bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
311 extern void try_offline_node(int nid);
312 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
313 extern int remove_memory(int nid, u64 start, u64 size);
314 extern void __remove_memory(int nid, u64 start, u64 size);
317 static inline bool is_mem_section_removable(unsigned long pfn,
318 unsigned long nr_pages)
323 static inline void try_offline_node(int nid) {}
325 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
330 static inline int remove_memory(int nid, u64 start, u64 size)
335 static inline void __remove_memory(int nid, u64 start, u64 size) {}
336 #endif /* CONFIG_MEMORY_HOTREMOVE */
338 extern void set_zone_contiguous(struct zone *zone);
339 extern void clear_zone_contiguous(struct zone *zone);
341 extern void __ref free_area_init_core_hotplug(int nid);
342 extern int __add_memory(int nid, u64 start, u64 size);
343 extern int add_memory(int nid, u64 start, u64 size);
344 extern int add_memory_resource(int nid, struct resource *resource);
345 extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
346 unsigned long nr_pages, struct vmem_altmap *altmap);
347 extern bool is_memblock_offlined(struct memory_block *mem);
348 extern int sparse_add_section(int nid, unsigned long pfn,
349 unsigned long nr_pages, struct vmem_altmap *altmap);
350 extern void sparse_remove_section(struct mem_section *ms,
351 unsigned long pfn, unsigned long nr_pages,
352 unsigned long map_offset, struct vmem_altmap *altmap);
353 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
355 extern bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long nr_pages,
357 extern struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn,
358 unsigned long nr_pages);
359 #endif /* __LINUX_MEMORY_HOTPLUG_H */