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. */
61 * Extended parameters for memory hotplug:
62 * altmap: alternative allocator for memmap array (optional)
63 * pgprot: page protection flags to apply to newly created page tables
67 struct vmem_altmap *altmap;
72 * Zone resizing functions
74 * Note: any attempt to resize a zone should has pgdat_resize_lock()
75 * zone_span_writelock() both held. This ensure the size of a zone
76 * can't be changed while pgdat_resize_lock() held.
78 static inline unsigned zone_span_seqbegin(struct zone *zone)
80 return read_seqbegin(&zone->span_seqlock);
82 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
84 return read_seqretry(&zone->span_seqlock, iv);
86 static inline void zone_span_writelock(struct zone *zone)
88 write_seqlock(&zone->span_seqlock);
90 static inline void zone_span_writeunlock(struct zone *zone)
92 write_sequnlock(&zone->span_seqlock);
94 static inline void zone_seqlock_init(struct zone *zone)
96 seqlock_init(&zone->span_seqlock);
98 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
99 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
100 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
101 /* VM interface that may be used by firmware interface */
102 extern int online_pages(unsigned long pfn, unsigned long nr_pages,
103 int online_type, int nid);
104 extern struct zone *test_pages_in_a_zone(unsigned long start_pfn,
105 unsigned long end_pfn);
106 extern unsigned long __offline_isolated_pages(unsigned long start_pfn,
107 unsigned long end_pfn);
109 typedef void (*online_page_callback_t)(struct page *page, unsigned int order);
111 extern void generic_online_page(struct page *page, unsigned int order);
112 extern int set_online_page_callback(online_page_callback_t callback);
113 extern int restore_online_page_callback(online_page_callback_t callback);
115 extern int try_online_node(int nid);
117 extern int arch_add_memory(int nid, u64 start, u64 size,
118 struct mhp_params *params);
119 extern u64 max_mem_size;
121 extern int memhp_online_type_from_str(const char *str);
123 /* Default online_type (MMOP_*) when new memory blocks are added. */
124 extern int memhp_default_online_type;
125 /* If movable_node boot option specified */
126 extern bool movable_node_enabled;
127 static inline bool movable_node_is_enabled(void)
129 return movable_node_enabled;
132 extern void arch_remove_memory(int nid, u64 start, u64 size,
133 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 */
153 extern int memory_add_physaddr_to_nid(u64 start);
155 static inline int memory_add_physaddr_to_nid(u64 start)
161 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
163 * For supporting node-hotadd, we have to allocate a new pgdat.
165 * If an arch has generic style NODE_DATA(),
166 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
168 * In general, generic_alloc_nodedata() is used.
169 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
172 extern pg_data_t *arch_alloc_nodedata(int nid);
173 extern void arch_free_nodedata(pg_data_t *pgdat);
174 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
176 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
178 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
179 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
183 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
184 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
185 * Because, pgdat for the new node is not allocated/initialized yet itself.
186 * To use new node's memory, more consideration will be necessary.
188 #define generic_alloc_nodedata(nid) \
190 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
193 * This definition is just for error path in node hotadd.
194 * For node hotremove, we have to replace this.
196 #define generic_free_nodedata(pgdat) kfree(pgdat)
198 extern pg_data_t *node_data[];
199 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
201 node_data[nid] = pgdat;
204 #else /* !CONFIG_NUMA */
207 static inline pg_data_t *generic_alloc_nodedata(int nid)
212 static inline void generic_free_nodedata(pg_data_t *pgdat)
215 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
218 #endif /* CONFIG_NUMA */
219 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
221 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
222 extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat);
224 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
228 extern void put_page_bootmem(struct page *page);
229 extern void get_page_bootmem(unsigned long ingo, struct page *page,
232 void get_online_mems(void);
233 void put_online_mems(void);
235 void mem_hotplug_begin(void);
236 void mem_hotplug_done(void);
238 #else /* ! CONFIG_MEMORY_HOTPLUG */
239 #define pfn_to_online_page(pfn) \
241 struct page *___page = NULL; \
242 if (pfn_valid(pfn)) \
243 ___page = pfn_to_page(pfn); \
247 static inline unsigned zone_span_seqbegin(struct zone *zone)
251 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
255 static inline void zone_span_writelock(struct zone *zone) {}
256 static inline void zone_span_writeunlock(struct zone *zone) {}
257 static inline void zone_seqlock_init(struct zone *zone) {}
259 static inline int mhp_notimplemented(const char *func)
261 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
266 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
270 static inline int try_online_node(int nid)
275 static inline void get_online_mems(void) {}
276 static inline void put_online_mems(void) {}
278 static inline void mem_hotplug_begin(void) {}
279 static inline void mem_hotplug_done(void) {}
281 static inline bool movable_node_is_enabled(void)
285 #endif /* ! CONFIG_MEMORY_HOTPLUG */
287 #if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT)
289 * pgdat resizing functions
292 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
294 spin_lock_irqsave(&pgdat->node_size_lock, *flags);
297 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
299 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
302 void pgdat_resize_init(struct pglist_data *pgdat)
304 spin_lock_init(&pgdat->node_size_lock);
306 #else /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
308 * Stub functions for when hotplug is off
310 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
311 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
312 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
313 #endif /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
315 #ifdef CONFIG_MEMORY_HOTREMOVE
317 extern bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
318 extern void try_offline_node(int nid);
319 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
320 extern int remove_memory(int nid, u64 start, u64 size);
321 extern void __remove_memory(int nid, u64 start, u64 size);
324 static inline bool is_mem_section_removable(unsigned long pfn,
325 unsigned long nr_pages)
330 static inline void try_offline_node(int nid) {}
332 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
337 static inline int remove_memory(int nid, u64 start, u64 size)
342 static inline void __remove_memory(int nid, u64 start, u64 size) {}
343 #endif /* CONFIG_MEMORY_HOTREMOVE */
345 extern void set_zone_contiguous(struct zone *zone);
346 extern void clear_zone_contiguous(struct zone *zone);
348 extern void __ref free_area_init_core_hotplug(int nid);
349 extern int __add_memory(int nid, u64 start, u64 size);
350 extern int add_memory(int nid, u64 start, u64 size);
351 extern int add_memory_resource(int nid, struct resource *resource);
352 extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
353 unsigned long nr_pages, struct vmem_altmap *altmap);
354 extern void remove_pfn_range_from_zone(struct zone *zone,
355 unsigned long start_pfn,
356 unsigned long nr_pages);
357 extern bool is_memblock_offlined(struct memory_block *mem);
358 extern int sparse_add_section(int nid, unsigned long pfn,
359 unsigned long nr_pages, struct vmem_altmap *altmap);
360 extern void sparse_remove_section(struct mem_section *ms,
361 unsigned long pfn, unsigned long nr_pages,
362 unsigned long map_offset, struct vmem_altmap *altmap);
363 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
365 extern bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long nr_pages,
367 extern struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn,
368 unsigned long nr_pages);
369 #endif /* __LINUX_MEMORY_HOTPLUG_H */