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 * Zone resizing functions
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.
63 static inline unsigned zone_span_seqbegin(struct zone *zone)
65 return read_seqbegin(&zone->span_seqlock);
67 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
69 return read_seqretry(&zone->span_seqlock, iv);
71 static inline void zone_span_writelock(struct zone *zone)
73 write_seqlock(&zone->span_seqlock);
75 static inline void zone_span_writeunlock(struct zone *zone)
77 write_sequnlock(&zone->span_seqlock);
79 static inline void zone_seqlock_init(struct zone *zone)
81 seqlock_init(&zone->span_seqlock);
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);
92 typedef void (*online_page_callback_t)(struct page *page, unsigned int order);
94 extern int set_online_page_callback(online_page_callback_t callback);
95 extern int restore_online_page_callback(online_page_callback_t callback);
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);
101 extern int try_online_node(int nid);
103 extern u64 max_mem_size;
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)
110 return movable_node_enabled;
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 */
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);
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,
129 return __add_pages(nid, start_pfn, nr_pages, altmap, want_memblock);
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 */
137 extern int memory_add_physaddr_to_nid(u64 start);
139 static inline int memory_add_physaddr_to_nid(u64 start)
145 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
147 * For supporting node-hotadd, we have to allocate a new pgdat.
149 * If an arch has generic style NODE_DATA(),
150 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
152 * In general, generic_alloc_nodedata() is used.
153 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
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);
160 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
162 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
163 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
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.
172 #define generic_alloc_nodedata(nid) \
174 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
177 * This definition is just for error path in node hotadd.
178 * For node hotremove, we have to replace this.
180 #define generic_free_nodedata(pgdat) kfree(pgdat)
182 extern pg_data_t *node_data[];
183 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
185 node_data[nid] = pgdat;
188 #else /* !CONFIG_NUMA */
191 static inline pg_data_t *generic_alloc_nodedata(int nid)
196 static inline void generic_free_nodedata(pg_data_t *pgdat)
199 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
202 #endif /* CONFIG_NUMA */
203 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
205 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
206 extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat);
208 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
212 extern void put_page_bootmem(struct page *page);
213 extern void get_page_bootmem(unsigned long ingo, struct page *page,
216 void get_online_mems(void);
217 void put_online_mems(void);
219 void mem_hotplug_begin(void);
220 void mem_hotplug_done(void);
222 extern void set_zone_contiguous(struct zone *zone);
223 extern void clear_zone_contiguous(struct zone *zone);
225 #else /* ! CONFIG_MEMORY_HOTPLUG */
226 #define pfn_to_online_page(pfn) \
228 struct page *___page = NULL; \
229 if (pfn_valid(pfn)) \
230 ___page = pfn_to_page(pfn); \
234 static inline unsigned zone_span_seqbegin(struct zone *zone)
238 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
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) {}
246 static inline int mhp_notimplemented(const char *func)
248 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
253 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
257 static inline int try_online_node(int nid)
262 static inline void get_online_mems(void) {}
263 static inline void put_online_mems(void) {}
265 static inline void mem_hotplug_begin(void) {}
266 static inline void mem_hotplug_done(void) {}
268 static inline bool movable_node_is_enabled(void)
272 #endif /* ! CONFIG_MEMORY_HOTPLUG */
274 #if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT)
276 * pgdat resizing functions
279 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
281 spin_lock_irqsave(&pgdat->node_size_lock, *flags);
284 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
286 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
289 void pgdat_resize_init(struct pglist_data *pgdat)
291 spin_lock_init(&pgdat->node_size_lock);
293 #else /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
295 * Stub functions for when hotplug is off
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) */
302 #ifdef CONFIG_MEMORY_HOTREMOVE
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);
311 static inline bool is_mem_section_removable(unsigned long pfn,
312 unsigned long nr_pages)
317 static inline void try_offline_node(int nid) {}
319 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
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 */
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,
345 extern bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long nr_pages,
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 */