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 ___nr = pfn_to_section_nr(pfn); \
29 if (___nr < NR_MEM_SECTIONS && online_section_nr(___nr))\
30 ___page = pfn_to_page(pfn); \
35 * Types for free bootmem stored in page->lru.next. These have to be in
36 * some random range in unsigned long space for debugging purposes.
39 MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12,
40 SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE,
43 MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO,
46 /* Types for control the zone type of onlined and offlined memory */
55 * Zone resizing functions
57 * Note: any attempt to resize a zone should has pgdat_resize_lock()
58 * zone_span_writelock() both held. This ensure the size of a zone
59 * can't be changed while pgdat_resize_lock() held.
61 static inline unsigned zone_span_seqbegin(struct zone *zone)
63 return read_seqbegin(&zone->span_seqlock);
65 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
67 return read_seqretry(&zone->span_seqlock, iv);
69 static inline void zone_span_writelock(struct zone *zone)
71 write_seqlock(&zone->span_seqlock);
73 static inline void zone_span_writeunlock(struct zone *zone)
75 write_sequnlock(&zone->span_seqlock);
77 static inline void zone_seqlock_init(struct zone *zone)
79 seqlock_init(&zone->span_seqlock);
81 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
82 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
83 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
84 /* VM interface that may be used by firmware interface */
85 extern int online_pages(unsigned long, unsigned long, int);
86 extern int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn,
87 unsigned long *valid_start, unsigned long *valid_end);
88 extern void __offline_isolated_pages(unsigned long, unsigned long);
90 typedef void (*online_page_callback_t)(struct page *page);
92 extern int set_online_page_callback(online_page_callback_t callback);
93 extern int restore_online_page_callback(online_page_callback_t callback);
95 extern void __online_page_set_limits(struct page *page);
96 extern void __online_page_increment_counters(struct page *page);
97 extern void __online_page_free(struct page *page);
99 extern int try_online_node(int nid);
101 extern bool memhp_auto_online;
102 /* If movable_node boot option specified */
103 extern bool movable_node_enabled;
104 static inline bool movable_node_is_enabled(void)
106 return movable_node_enabled;
109 #ifdef CONFIG_MEMORY_HOTREMOVE
110 extern bool is_pageblock_removable_nolock(struct page *page);
111 extern int arch_remove_memory(u64 start, u64 size,
112 struct vmem_altmap *altmap);
113 extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
114 unsigned long nr_pages, struct vmem_altmap *altmap);
115 #endif /* CONFIG_MEMORY_HOTREMOVE */
117 /* reasonably generic interface to expand the physical pages */
118 extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
119 struct vmem_altmap *altmap, bool want_memblock);
121 #ifndef CONFIG_ARCH_HAS_ADD_PAGES
122 static inline int add_pages(int nid, unsigned long start_pfn,
123 unsigned long nr_pages, struct vmem_altmap *altmap,
126 return __add_pages(nid, start_pfn, nr_pages, altmap, want_memblock);
128 #else /* ARCH_HAS_ADD_PAGES */
129 int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
130 struct vmem_altmap *altmap, bool want_memblock);
131 #endif /* ARCH_HAS_ADD_PAGES */
134 extern int memory_add_physaddr_to_nid(u64 start);
136 static inline int memory_add_physaddr_to_nid(u64 start)
142 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
144 * For supporting node-hotadd, we have to allocate a new pgdat.
146 * If an arch has generic style NODE_DATA(),
147 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
149 * In general, generic_alloc_nodedata() is used.
150 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
153 extern pg_data_t *arch_alloc_nodedata(int nid);
154 extern void arch_free_nodedata(pg_data_t *pgdat);
155 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
157 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
159 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
160 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
164 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
165 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
166 * Because, pgdat for the new node is not allocated/initialized yet itself.
167 * To use new node's memory, more consideration will be necessary.
169 #define generic_alloc_nodedata(nid) \
171 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
174 * This definition is just for error path in node hotadd.
175 * For node hotremove, we have to replace this.
177 #define generic_free_nodedata(pgdat) kfree(pgdat)
179 extern pg_data_t *node_data[];
180 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
182 node_data[nid] = pgdat;
185 #else /* !CONFIG_NUMA */
188 static inline pg_data_t *generic_alloc_nodedata(int nid)
193 static inline void generic_free_nodedata(pg_data_t *pgdat)
196 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
199 #endif /* CONFIG_NUMA */
200 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
202 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
203 extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat);
205 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
209 extern void put_page_bootmem(struct page *page);
210 extern void get_page_bootmem(unsigned long ingo, struct page *page,
213 void get_online_mems(void);
214 void put_online_mems(void);
216 void mem_hotplug_begin(void);
217 void mem_hotplug_done(void);
219 #else /* ! CONFIG_MEMORY_HOTPLUG */
220 #define pfn_to_online_page(pfn) \
222 struct page *___page = NULL; \
223 if (pfn_valid(pfn)) \
224 ___page = pfn_to_page(pfn); \
228 static inline unsigned zone_span_seqbegin(struct zone *zone)
232 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
236 static inline void zone_span_writelock(struct zone *zone) {}
237 static inline void zone_span_writeunlock(struct zone *zone) {}
238 static inline void zone_seqlock_init(struct zone *zone) {}
240 static inline int mhp_notimplemented(const char *func)
242 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
247 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
251 static inline int try_online_node(int nid)
256 static inline void get_online_mems(void) {}
257 static inline void put_online_mems(void) {}
259 static inline void mem_hotplug_begin(void) {}
260 static inline void mem_hotplug_done(void) {}
262 static inline bool movable_node_is_enabled(void)
266 #endif /* ! CONFIG_MEMORY_HOTPLUG */
268 #if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT)
270 * pgdat resizing functions
273 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
275 spin_lock_irqsave(&pgdat->node_size_lock, *flags);
278 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
280 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
283 void pgdat_resize_init(struct pglist_data *pgdat)
285 spin_lock_init(&pgdat->node_size_lock);
287 #else /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
289 * Stub functions for when hotplug is off
291 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
292 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
293 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
294 #endif /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
296 #ifdef CONFIG_MEMORY_HOTREMOVE
298 extern bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
299 extern void try_offline_node(int nid);
300 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
301 extern void remove_memory(int nid, u64 start, u64 size);
304 static inline bool is_mem_section_removable(unsigned long pfn,
305 unsigned long nr_pages)
310 static inline void try_offline_node(int nid) {}
312 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
317 static inline void remove_memory(int nid, u64 start, u64 size) {}
318 #endif /* CONFIG_MEMORY_HOTREMOVE */
320 extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
321 void *arg, int (*func)(struct memory_block *, void *));
322 extern int add_memory(int nid, u64 start, u64 size);
323 extern int add_memory_resource(int nid, struct resource *resource, bool online);
324 extern int arch_add_memory(int nid, u64 start, u64 size,
325 struct vmem_altmap *altmap, bool want_memblock);
326 extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
327 unsigned long nr_pages, struct vmem_altmap *altmap);
328 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
329 extern bool is_memblock_offlined(struct memory_block *mem);
330 extern void remove_memory(int nid, u64 start, u64 size);
331 extern int sparse_add_one_section(struct pglist_data *pgdat,
332 unsigned long start_pfn, struct vmem_altmap *altmap);
333 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms,
334 unsigned long map_offset, struct vmem_altmap *altmap);
335 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
337 extern bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long nr_pages,
339 extern struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn,
340 unsigned long nr_pages);
341 #endif /* __LINUX_MEMORY_HOTPLUG_H */