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 int set_online_page_callback(online_page_callback_t callback);
106 extern int restore_online_page_callback(online_page_callback_t callback);
108 extern void __online_page_set_limits(struct page *page);
109 extern void __online_page_increment_counters(struct page *page);
110 extern void __online_page_free(struct page *page);
112 extern int try_online_node(int nid);
114 extern int arch_add_memory(int nid, u64 start, u64 size,
115 struct mhp_restrictions *restrictions);
116 extern u64 max_mem_size;
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 extern void arch_remove_memory(int nid, u64 start, u64 size,
127 struct vmem_altmap *altmap);
128 extern void __remove_pages(struct zone *zone, unsigned long start_pfn,
129 unsigned long nr_pages, struct vmem_altmap *altmap);
131 /* reasonably generic interface to expand the physical pages */
132 extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
133 struct mhp_restrictions *restrictions);
135 #ifndef CONFIG_ARCH_HAS_ADD_PAGES
136 static inline int add_pages(int nid, unsigned long start_pfn,
137 unsigned long nr_pages, struct mhp_restrictions *restrictions)
139 return __add_pages(nid, start_pfn, nr_pages, restrictions);
141 #else /* ARCH_HAS_ADD_PAGES */
142 int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
143 struct mhp_restrictions *restrictions);
144 #endif /* ARCH_HAS_ADD_PAGES */
147 extern int memory_add_physaddr_to_nid(u64 start);
149 static inline int memory_add_physaddr_to_nid(u64 start)
155 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
157 * For supporting node-hotadd, we have to allocate a new pgdat.
159 * If an arch has generic style NODE_DATA(),
160 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
162 * In general, generic_alloc_nodedata() is used.
163 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
166 extern pg_data_t *arch_alloc_nodedata(int nid);
167 extern void arch_free_nodedata(pg_data_t *pgdat);
168 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
170 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
172 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
173 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
177 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
178 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
179 * Because, pgdat for the new node is not allocated/initialized yet itself.
180 * To use new node's memory, more consideration will be necessary.
182 #define generic_alloc_nodedata(nid) \
184 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
187 * This definition is just for error path in node hotadd.
188 * For node hotremove, we have to replace this.
190 #define generic_free_nodedata(pgdat) kfree(pgdat)
192 extern pg_data_t *node_data[];
193 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
195 node_data[nid] = pgdat;
198 #else /* !CONFIG_NUMA */
201 static inline pg_data_t *generic_alloc_nodedata(int nid)
206 static inline void generic_free_nodedata(pg_data_t *pgdat)
209 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
212 #endif /* CONFIG_NUMA */
213 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
215 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
216 extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat);
218 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
222 extern void put_page_bootmem(struct page *page);
223 extern void get_page_bootmem(unsigned long ingo, struct page *page,
226 void get_online_mems(void);
227 void put_online_mems(void);
229 void mem_hotplug_begin(void);
230 void mem_hotplug_done(void);
232 extern void set_zone_contiguous(struct zone *zone);
233 extern void clear_zone_contiguous(struct zone *zone);
235 #else /* ! CONFIG_MEMORY_HOTPLUG */
236 #define pfn_to_online_page(pfn) \
238 struct page *___page = NULL; \
239 if (pfn_valid(pfn)) \
240 ___page = pfn_to_page(pfn); \
244 static inline unsigned zone_span_seqbegin(struct zone *zone)
248 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
252 static inline void zone_span_writelock(struct zone *zone) {}
253 static inline void zone_span_writeunlock(struct zone *zone) {}
254 static inline void zone_seqlock_init(struct zone *zone) {}
256 static inline int mhp_notimplemented(const char *func)
258 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
263 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
267 static inline int try_online_node(int nid)
272 static inline void get_online_mems(void) {}
273 static inline void put_online_mems(void) {}
275 static inline void mem_hotplug_begin(void) {}
276 static inline void mem_hotplug_done(void) {}
278 static inline bool movable_node_is_enabled(void)
282 #endif /* ! CONFIG_MEMORY_HOTPLUG */
284 #if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT)
286 * pgdat resizing functions
289 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
291 spin_lock_irqsave(&pgdat->node_size_lock, *flags);
294 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
296 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
299 void pgdat_resize_init(struct pglist_data *pgdat)
301 spin_lock_init(&pgdat->node_size_lock);
303 #else /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
305 * Stub functions for when hotplug is off
307 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
308 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
309 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
310 #endif /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
312 #ifdef CONFIG_MEMORY_HOTREMOVE
314 extern bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
315 extern void try_offline_node(int nid);
316 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
317 extern int remove_memory(int nid, u64 start, u64 size);
318 extern void __remove_memory(int nid, u64 start, u64 size);
321 static inline bool is_mem_section_removable(unsigned long pfn,
322 unsigned long nr_pages)
327 static inline void try_offline_node(int nid) {}
329 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
334 static inline int remove_memory(int nid, u64 start, u64 size)
339 static inline void __remove_memory(int nid, u64 start, u64 size) {}
340 #endif /* CONFIG_MEMORY_HOTREMOVE */
342 extern void __ref free_area_init_core_hotplug(int nid);
343 extern int __add_memory(int nid, u64 start, u64 size);
344 extern int add_memory(int nid, u64 start, u64 size);
345 extern int add_memory_resource(int nid, struct resource *resource);
346 extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
347 unsigned long nr_pages, struct vmem_altmap *altmap);
348 extern bool is_memblock_offlined(struct memory_block *mem);
349 extern int sparse_add_section(int nid, unsigned long pfn,
350 unsigned long nr_pages, struct vmem_altmap *altmap);
351 extern void sparse_remove_section(struct mem_section *ms,
352 unsigned long pfn, unsigned long nr_pages,
353 unsigned long map_offset, struct vmem_altmap *altmap);
354 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
356 extern bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long nr_pages,
358 extern struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn,
359 unsigned long nr_pages);
360 #endif /* __LINUX_MEMORY_HOTPLUG_H */