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
19 struct page *pfn_to_online_page(unsigned long pfn);
22 * Types for free bootmem stored in page->lru.next. These have to be in
23 * some random range in unsigned long space for debugging purposes.
26 MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12,
27 SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE,
30 MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO,
33 /* Types for control the zone type of onlined and offlined memory */
35 /* Offline the memory. */
37 /* Online the memory. Zone depends, see default_zone_for_pfn(). */
39 /* Online the memory to ZONE_NORMAL. */
41 /* Online the memory to ZONE_MOVABLE. */
45 /* Flags for add_memory() and friends to specify memory hotplug details. */
46 typedef int __bitwise mhp_t;
48 /* No special request */
49 #define MHP_NONE ((__force mhp_t)0)
51 * Allow merging of the added System RAM resource with adjacent,
52 * mergeable resources. After a successful call to add_memory_resource()
53 * with this flag set, the resource pointer must no longer be used as it
54 * might be stale, or the resource might have changed.
56 #define MHP_MERGE_RESOURCE ((__force mhp_t)BIT(0))
59 * Extended parameters for memory hotplug:
60 * altmap: alternative allocator for memmap array (optional)
61 * pgprot: page protection flags to apply to newly created page tables
65 struct vmem_altmap *altmap;
69 bool mhp_range_allowed(u64 start, u64 size, bool need_mapping);
70 struct range mhp_get_pluggable_range(bool need_mapping);
73 * Zone resizing functions
75 * Note: any attempt to resize a zone should has pgdat_resize_lock()
76 * zone_span_writelock() both held. This ensure the size of a zone
77 * can't be changed while pgdat_resize_lock() held.
79 static inline unsigned zone_span_seqbegin(struct zone *zone)
81 return read_seqbegin(&zone->span_seqlock);
83 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
85 return read_seqretry(&zone->span_seqlock, iv);
87 static inline void zone_span_writelock(struct zone *zone)
89 write_seqlock(&zone->span_seqlock);
91 static inline void zone_span_writeunlock(struct zone *zone)
93 write_sequnlock(&zone->span_seqlock);
95 static inline void zone_seqlock_init(struct zone *zone)
97 seqlock_init(&zone->span_seqlock);
99 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
100 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
101 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
102 /* VM interface that may be used by firmware interface */
103 extern int online_pages(unsigned long pfn, unsigned long nr_pages,
104 int online_type, int nid);
105 extern struct zone *test_pages_in_a_zone(unsigned long start_pfn,
106 unsigned long end_pfn);
107 extern void __offline_isolated_pages(unsigned long start_pfn,
108 unsigned long end_pfn);
110 typedef void (*online_page_callback_t)(struct page *page, unsigned int order);
112 extern void generic_online_page(struct page *page, unsigned int order);
113 extern int set_online_page_callback(online_page_callback_t callback);
114 extern int restore_online_page_callback(online_page_callback_t callback);
116 extern int try_online_node(int nid);
118 extern int arch_add_memory(int nid, u64 start, u64 size,
119 struct mhp_params *params);
120 extern u64 max_mem_size;
122 extern int mhp_online_type_from_str(const char *str);
124 /* Default online_type (MMOP_*) when new memory blocks are added. */
125 extern int mhp_default_online_type;
126 /* If movable_node boot option specified */
127 extern bool movable_node_enabled;
128 static inline bool movable_node_is_enabled(void)
130 return movable_node_enabled;
133 extern void arch_remove_memory(int nid, u64 start, u64 size,
134 struct vmem_altmap *altmap);
135 extern void __remove_pages(unsigned long start_pfn, unsigned long nr_pages,
136 struct vmem_altmap *altmap);
138 /* reasonably generic interface to expand the physical pages */
139 extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
140 struct mhp_params *params);
142 #ifndef CONFIG_ARCH_HAS_ADD_PAGES
143 static inline int add_pages(int nid, unsigned long start_pfn,
144 unsigned long nr_pages, struct mhp_params *params)
146 return __add_pages(nid, start_pfn, nr_pages, params);
148 #else /* ARCH_HAS_ADD_PAGES */
149 int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
150 struct mhp_params *params);
151 #endif /* ARCH_HAS_ADD_PAGES */
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 void register_page_bootmem_info_node(struct pglist_data *pgdat)
255 static inline int try_online_node(int nid)
260 static inline void get_online_mems(void) {}
261 static inline void put_online_mems(void) {}
263 static inline void mem_hotplug_begin(void) {}
264 static inline void mem_hotplug_done(void) {}
266 static inline bool movable_node_is_enabled(void)
270 #endif /* ! CONFIG_MEMORY_HOTPLUG */
273 * Keep this declaration outside CONFIG_MEMORY_HOTPLUG as some
274 * platforms might override and use arch_get_mappable_range()
275 * for internal non memory hotplug purposes.
277 struct range arch_get_mappable_range(void);
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 void try_offline_node(int nid);
310 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
311 extern int remove_memory(int nid, u64 start, u64 size);
312 extern void __remove_memory(int nid, u64 start, u64 size);
313 extern int offline_and_remove_memory(int nid, u64 start, u64 size);
316 static inline void try_offline_node(int nid) {}
318 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
323 static inline int remove_memory(int nid, u64 start, u64 size)
328 static inline void __remove_memory(int nid, u64 start, u64 size) {}
329 #endif /* CONFIG_MEMORY_HOTREMOVE */
331 extern void set_zone_contiguous(struct zone *zone);
332 extern void clear_zone_contiguous(struct zone *zone);
334 #ifdef CONFIG_MEMORY_HOTPLUG
335 extern void __ref free_area_init_core_hotplug(int nid);
336 extern int __add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags);
337 extern int add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags);
338 extern int add_memory_resource(int nid, struct resource *resource,
340 extern int add_memory_driver_managed(int nid, u64 start, u64 size,
341 const char *resource_name,
343 extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
344 unsigned long nr_pages,
345 struct vmem_altmap *altmap, int migratetype);
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 struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn,
358 unsigned long nr_pages);
359 extern int arch_create_linear_mapping(int nid, u64 start, u64 size,
360 struct mhp_params *params);
361 void arch_remove_linear_mapping(u64 start, u64 size);
362 #endif /* CONFIG_MEMORY_HOTPLUG */
364 #endif /* __LINUX_MEMORY_HOTPLUG_H */