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 */
50 /* Offline the memory. */
52 /* Online the memory. Zone depends, see default_zone_for_pfn(). */
54 /* Online the memory to ZONE_NORMAL. */
56 /* Online the memory to ZONE_MOVABLE. */
60 /* Flags for add_memory() and friends to specify memory hotplug details. */
61 typedef int __bitwise mhp_t;
63 /* No special request */
64 #define MHP_NONE ((__force mhp_t)0)
66 * Allow merging of the added System RAM resource with adjacent,
67 * mergeable resources. After a successful call to add_memory_resource()
68 * with this flag set, the resource pointer must no longer be used as it
69 * might be stale, or the resource might have changed.
71 #define MEMHP_MERGE_RESOURCE ((__force mhp_t)BIT(0))
74 * Extended parameters for memory hotplug:
75 * altmap: alternative allocator for memmap array (optional)
76 * pgprot: page protection flags to apply to newly created page tables
80 struct vmem_altmap *altmap;
85 * Zone resizing functions
87 * Note: any attempt to resize a zone should has pgdat_resize_lock()
88 * zone_span_writelock() both held. This ensure the size of a zone
89 * can't be changed while pgdat_resize_lock() held.
91 static inline unsigned zone_span_seqbegin(struct zone *zone)
93 return read_seqbegin(&zone->span_seqlock);
95 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
97 return read_seqretry(&zone->span_seqlock, iv);
99 static inline void zone_span_writelock(struct zone *zone)
101 write_seqlock(&zone->span_seqlock);
103 static inline void zone_span_writeunlock(struct zone *zone)
105 write_sequnlock(&zone->span_seqlock);
107 static inline void zone_seqlock_init(struct zone *zone)
109 seqlock_init(&zone->span_seqlock);
111 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
112 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
113 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
114 /* VM interface that may be used by firmware interface */
115 extern int online_pages(unsigned long pfn, unsigned long nr_pages,
116 int online_type, int nid);
117 extern struct zone *test_pages_in_a_zone(unsigned long start_pfn,
118 unsigned long end_pfn);
119 extern void __offline_isolated_pages(unsigned long start_pfn,
120 unsigned long end_pfn);
122 typedef void (*online_page_callback_t)(struct page *page, unsigned int order);
124 extern void generic_online_page(struct page *page, unsigned int order);
125 extern int set_online_page_callback(online_page_callback_t callback);
126 extern int restore_online_page_callback(online_page_callback_t callback);
128 extern int try_online_node(int nid);
130 extern int arch_add_memory(int nid, u64 start, u64 size,
131 struct mhp_params *params);
132 extern u64 max_mem_size;
134 extern int memhp_online_type_from_str(const char *str);
136 /* Default online_type (MMOP_*) when new memory blocks are added. */
137 extern int memhp_default_online_type;
138 /* If movable_node boot option specified */
139 extern bool movable_node_enabled;
140 static inline bool movable_node_is_enabled(void)
142 return movable_node_enabled;
145 extern void arch_remove_memory(int nid, u64 start, u64 size,
146 struct vmem_altmap *altmap);
147 extern void __remove_pages(unsigned long start_pfn, unsigned long nr_pages,
148 struct vmem_altmap *altmap);
150 /* reasonably generic interface to expand the physical pages */
151 extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
152 struct mhp_params *params);
154 #ifndef CONFIG_ARCH_HAS_ADD_PAGES
155 static inline int add_pages(int nid, unsigned long start_pfn,
156 unsigned long nr_pages, struct mhp_params *params)
158 return __add_pages(nid, start_pfn, nr_pages, params);
160 #else /* ARCH_HAS_ADD_PAGES */
161 int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
162 struct mhp_params *params);
163 #endif /* ARCH_HAS_ADD_PAGES */
165 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
167 * For supporting node-hotadd, we have to allocate a new pgdat.
169 * If an arch has generic style NODE_DATA(),
170 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
172 * In general, generic_alloc_nodedata() is used.
173 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
176 extern pg_data_t *arch_alloc_nodedata(int nid);
177 extern void arch_free_nodedata(pg_data_t *pgdat);
178 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
180 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
182 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
183 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
187 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
188 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
189 * Because, pgdat for the new node is not allocated/initialized yet itself.
190 * To use new node's memory, more consideration will be necessary.
192 #define generic_alloc_nodedata(nid) \
194 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
197 * This definition is just for error path in node hotadd.
198 * For node hotremove, we have to replace this.
200 #define generic_free_nodedata(pgdat) kfree(pgdat)
202 extern pg_data_t *node_data[];
203 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
205 node_data[nid] = pgdat;
208 #else /* !CONFIG_NUMA */
211 static inline pg_data_t *generic_alloc_nodedata(int nid)
216 static inline void generic_free_nodedata(pg_data_t *pgdat)
219 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
222 #endif /* CONFIG_NUMA */
223 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
225 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
226 extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat);
228 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
232 extern void put_page_bootmem(struct page *page);
233 extern void get_page_bootmem(unsigned long ingo, struct page *page,
236 void get_online_mems(void);
237 void put_online_mems(void);
239 void mem_hotplug_begin(void);
240 void mem_hotplug_done(void);
242 #else /* ! CONFIG_MEMORY_HOTPLUG */
243 #define pfn_to_online_page(pfn) \
245 struct page *___page = NULL; \
246 if (pfn_valid(pfn)) \
247 ___page = pfn_to_page(pfn); \
251 static inline unsigned zone_span_seqbegin(struct zone *zone)
255 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
259 static inline void zone_span_writelock(struct zone *zone) {}
260 static inline void zone_span_writeunlock(struct zone *zone) {}
261 static inline void zone_seqlock_init(struct zone *zone) {}
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 */
285 extern int memory_add_physaddr_to_nid(u64 start);
286 extern int phys_to_target_node(u64 start);
288 static inline int memory_add_physaddr_to_nid(u64 start)
292 static inline int phys_to_target_node(u64 start)
298 #if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT)
300 * pgdat resizing functions
303 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
305 spin_lock_irqsave(&pgdat->node_size_lock, *flags);
308 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
310 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
313 void pgdat_resize_init(struct pglist_data *pgdat)
315 spin_lock_init(&pgdat->node_size_lock);
317 #else /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
319 * Stub functions for when hotplug is off
321 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
322 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
323 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
324 #endif /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
326 #ifdef CONFIG_MEMORY_HOTREMOVE
328 extern void try_offline_node(int nid);
329 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
330 extern int remove_memory(int nid, u64 start, u64 size);
331 extern void __remove_memory(int nid, u64 start, u64 size);
332 extern int offline_and_remove_memory(int nid, u64 start, u64 size);
335 static inline void try_offline_node(int nid) {}
337 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
342 static inline int remove_memory(int nid, u64 start, u64 size)
347 static inline void __remove_memory(int nid, u64 start, u64 size) {}
348 #endif /* CONFIG_MEMORY_HOTREMOVE */
350 extern void set_zone_contiguous(struct zone *zone);
351 extern void clear_zone_contiguous(struct zone *zone);
353 #ifdef CONFIG_MEMORY_HOTPLUG
354 extern void __ref free_area_init_core_hotplug(int nid);
355 extern int __add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags);
356 extern int add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags);
357 extern int add_memory_resource(int nid, struct resource *resource,
359 extern int add_memory_driver_managed(int nid, u64 start, u64 size,
360 const char *resource_name,
362 extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
363 unsigned long nr_pages,
364 struct vmem_altmap *altmap, int migratetype);
365 extern void remove_pfn_range_from_zone(struct zone *zone,
366 unsigned long start_pfn,
367 unsigned long nr_pages);
368 extern bool is_memblock_offlined(struct memory_block *mem);
369 extern int sparse_add_section(int nid, unsigned long pfn,
370 unsigned long nr_pages, struct vmem_altmap *altmap);
371 extern void sparse_remove_section(struct mem_section *ms,
372 unsigned long pfn, unsigned long nr_pages,
373 unsigned long map_offset, struct vmem_altmap *altmap);
374 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
376 extern struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn,
377 unsigned long nr_pages);
378 #endif /* CONFIG_MEMORY_HOTPLUG */
380 #endif /* __LINUX_MEMORY_HOTPLUG_H */