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);
21 /* Types for control the zone type of onlined and offlined memory */
23 /* Offline the memory. */
25 /* Online the memory. Zone depends, see default_zone_for_pfn(). */
27 /* Online the memory to ZONE_NORMAL. */
29 /* Online the memory to ZONE_MOVABLE. */
33 /* Flags for add_memory() and friends to specify memory hotplug details. */
34 typedef int __bitwise mhp_t;
36 /* No special request */
37 #define MHP_NONE ((__force mhp_t)0)
39 * Allow merging of the added System RAM resource with adjacent,
40 * mergeable resources. After a successful call to add_memory_resource()
41 * with this flag set, the resource pointer must no longer be used as it
42 * might be stale, or the resource might have changed.
44 #define MHP_MERGE_RESOURCE ((__force mhp_t)BIT(0))
47 * We want memmap (struct page array) to be self contained.
48 * To do so, we will use the beginning of the hot-added range to build
49 * the page tables for the memmap array that describes the entire range.
50 * Only selected architectures support it with SPARSE_VMEMMAP.
52 #define MHP_MEMMAP_ON_MEMORY ((__force mhp_t)BIT(1))
55 * Extended parameters for memory hotplug:
56 * altmap: alternative allocator for memmap array (optional)
57 * pgprot: page protection flags to apply to newly created page tables
61 struct vmem_altmap *altmap;
65 bool mhp_range_allowed(u64 start, u64 size, bool need_mapping);
66 struct range mhp_get_pluggable_range(bool need_mapping);
69 * Zone resizing functions
71 * Note: any attempt to resize a zone should has pgdat_resize_lock()
72 * zone_span_writelock() both held. This ensure the size of a zone
73 * can't be changed while pgdat_resize_lock() held.
75 static inline unsigned zone_span_seqbegin(struct zone *zone)
77 return read_seqbegin(&zone->span_seqlock);
79 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
81 return read_seqretry(&zone->span_seqlock, iv);
83 static inline void zone_span_writelock(struct zone *zone)
85 write_seqlock(&zone->span_seqlock);
87 static inline void zone_span_writeunlock(struct zone *zone)
89 write_sequnlock(&zone->span_seqlock);
91 static inline void zone_seqlock_init(struct zone *zone)
93 seqlock_init(&zone->span_seqlock);
95 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
96 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
97 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
98 extern void adjust_present_page_count(struct zone *zone, long nr_pages);
99 /* VM interface that may be used by firmware interface */
100 extern int mhp_init_memmap_on_memory(unsigned long pfn, unsigned long nr_pages,
102 extern void mhp_deinit_memmap_on_memory(unsigned long pfn, unsigned long nr_pages);
103 extern int online_pages(unsigned long pfn, unsigned long nr_pages,
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(u64 start, u64 size, struct vmem_altmap *altmap);
134 extern void __remove_pages(unsigned long start_pfn, unsigned long nr_pages,
135 struct vmem_altmap *altmap);
137 /* reasonably generic interface to expand the physical pages */
138 extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
139 struct mhp_params *params);
141 #ifndef CONFIG_ARCH_HAS_ADD_PAGES
142 static inline int add_pages(int nid, unsigned long start_pfn,
143 unsigned long nr_pages, struct mhp_params *params)
145 return __add_pages(nid, start_pfn, nr_pages, params);
147 #else /* ARCH_HAS_ADD_PAGES */
148 int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
149 struct mhp_params *params);
150 #endif /* ARCH_HAS_ADD_PAGES */
152 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
154 * For supporting node-hotadd, we have to allocate a new pgdat.
156 * If an arch has generic style NODE_DATA(),
157 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
159 * In general, generic_alloc_nodedata() is used.
160 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
163 extern pg_data_t *arch_alloc_nodedata(int nid);
164 extern void arch_free_nodedata(pg_data_t *pgdat);
165 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
167 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
169 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
170 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
174 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
175 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
176 * Because, pgdat for the new node is not allocated/initialized yet itself.
177 * To use new node's memory, more consideration will be necessary.
179 #define generic_alloc_nodedata(nid) \
181 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
184 * This definition is just for error path in node hotadd.
185 * For node hotremove, we have to replace this.
187 #define generic_free_nodedata(pgdat) kfree(pgdat)
189 extern pg_data_t *node_data[];
190 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
192 node_data[nid] = pgdat;
195 #else /* !CONFIG_NUMA */
198 static inline pg_data_t *generic_alloc_nodedata(int nid)
203 static inline void generic_free_nodedata(pg_data_t *pgdat)
206 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
209 #endif /* CONFIG_NUMA */
210 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
212 void get_online_mems(void);
213 void put_online_mems(void);
215 void mem_hotplug_begin(void);
216 void mem_hotplug_done(void);
218 #else /* ! CONFIG_MEMORY_HOTPLUG */
219 #define pfn_to_online_page(pfn) \
221 struct page *___page = NULL; \
222 if (pfn_valid(pfn)) \
223 ___page = pfn_to_page(pfn); \
227 static inline unsigned zone_span_seqbegin(struct zone *zone)
231 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
235 static inline void zone_span_writelock(struct zone *zone) {}
236 static inline void zone_span_writeunlock(struct zone *zone) {}
237 static inline void zone_seqlock_init(struct zone *zone) {}
239 static inline int try_online_node(int nid)
244 static inline void get_online_mems(void) {}
245 static inline void put_online_mems(void) {}
247 static inline void mem_hotplug_begin(void) {}
248 static inline void mem_hotplug_done(void) {}
250 static inline bool movable_node_is_enabled(void)
254 #endif /* ! CONFIG_MEMORY_HOTPLUG */
257 * Keep this declaration outside CONFIG_MEMORY_HOTPLUG as some
258 * platforms might override and use arch_get_mappable_range()
259 * for internal non memory hotplug purposes.
261 struct range arch_get_mappable_range(void);
263 #if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT)
265 * pgdat resizing functions
268 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
270 spin_lock_irqsave(&pgdat->node_size_lock, *flags);
273 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
275 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
278 void pgdat_resize_init(struct pglist_data *pgdat)
280 spin_lock_init(&pgdat->node_size_lock);
282 #else /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
284 * Stub functions for when hotplug is off
286 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
287 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
288 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
289 #endif /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
291 #ifdef CONFIG_MEMORY_HOTREMOVE
293 extern void try_offline_node(int nid);
294 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
295 extern int remove_memory(u64 start, u64 size);
296 extern void __remove_memory(u64 start, u64 size);
297 extern int offline_and_remove_memory(u64 start, u64 size);
300 static inline void try_offline_node(int nid) {}
302 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
307 static inline int remove_memory(u64 start, u64 size)
312 static inline void __remove_memory(u64 start, u64 size) {}
313 #endif /* CONFIG_MEMORY_HOTREMOVE */
315 extern void set_zone_contiguous(struct zone *zone);
316 extern void clear_zone_contiguous(struct zone *zone);
318 #ifdef CONFIG_MEMORY_HOTPLUG
319 extern void __ref free_area_init_core_hotplug(int nid);
320 extern int __add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags);
321 extern int add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags);
322 extern int add_memory_resource(int nid, struct resource *resource,
324 extern int add_memory_driver_managed(int nid, u64 start, u64 size,
325 const char *resource_name,
327 extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
328 unsigned long nr_pages,
329 struct vmem_altmap *altmap, int migratetype);
330 extern void remove_pfn_range_from_zone(struct zone *zone,
331 unsigned long start_pfn,
332 unsigned long nr_pages);
333 extern bool is_memblock_offlined(struct memory_block *mem);
334 extern int sparse_add_section(int nid, unsigned long pfn,
335 unsigned long nr_pages, struct vmem_altmap *altmap);
336 extern void sparse_remove_section(struct mem_section *ms,
337 unsigned long pfn, unsigned long nr_pages,
338 unsigned long map_offset, struct vmem_altmap *altmap);
339 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
341 extern struct zone *zone_for_pfn_range(int online_type, int nid,
342 unsigned long start_pfn, unsigned long nr_pages);
343 extern int arch_create_linear_mapping(int nid, u64 start, u64 size,
344 struct mhp_params *params);
345 void arch_remove_linear_mapping(u64 start, u64 size);
346 extern bool mhp_supports_memmap_on_memory(unsigned long size);
347 #endif /* CONFIG_MEMORY_HOTPLUG */
349 #endif /* __LINUX_MEMORY_HOTPLUG_H */