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 */
57 * Restrictions for the memory hotplug:
59 * altmap: alternative allocator for memmap array
61 struct mhp_restrictions {
63 struct vmem_altmap *altmap;
67 * Zone resizing functions
69 * Note: any attempt to resize a zone should has pgdat_resize_lock()
70 * zone_span_writelock() both held. This ensure the size of a zone
71 * can't be changed while pgdat_resize_lock() held.
73 static inline unsigned zone_span_seqbegin(struct zone *zone)
75 return read_seqbegin(&zone->span_seqlock);
77 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
79 return read_seqretry(&zone->span_seqlock, iv);
81 static inline void zone_span_writelock(struct zone *zone)
83 write_seqlock(&zone->span_seqlock);
85 static inline void zone_span_writeunlock(struct zone *zone)
87 write_sequnlock(&zone->span_seqlock);
89 static inline void zone_seqlock_init(struct zone *zone)
91 seqlock_init(&zone->span_seqlock);
93 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
94 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
95 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
96 /* VM interface that may be used by firmware interface */
97 extern int online_pages(unsigned long, unsigned long, int);
98 extern int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn,
99 unsigned long *valid_start, unsigned long *valid_end);
100 extern unsigned long __offline_isolated_pages(unsigned long start_pfn,
101 unsigned long end_pfn);
103 typedef void (*online_page_callback_t)(struct page *page, unsigned int order);
105 extern int set_online_page_callback(online_page_callback_t callback);
106 extern int restore_online_page_callback(online_page_callback_t callback);
108 extern void __online_page_set_limits(struct page *page);
109 extern void __online_page_increment_counters(struct page *page);
110 extern void __online_page_free(struct page *page);
112 extern int try_online_node(int nid);
114 extern int arch_add_memory(int nid, u64 start, u64 size,
115 struct mhp_restrictions *restrictions);
116 extern u64 max_mem_size;
118 extern bool memhp_auto_online;
119 /* If movable_node boot option specified */
120 extern bool movable_node_enabled;
121 static inline bool movable_node_is_enabled(void)
123 return movable_node_enabled;
126 extern void arch_remove_memory(int nid, u64 start, u64 size,
127 struct vmem_altmap *altmap);
128 extern void __remove_pages(struct zone *zone, unsigned long start_pfn,
129 unsigned long nr_pages, struct vmem_altmap *altmap);
132 * Do we want sysfs memblock files created. This will allow userspace to online
133 * and offline memory explicitly. Lack of this bit means that the caller has to
134 * call move_pfn_range_to_zone to finish the initialization.
137 #define MHP_MEMBLOCK_API (1<<0)
139 /* reasonably generic interface to expand the physical pages */
140 extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
141 struct mhp_restrictions *restrictions);
143 #ifndef CONFIG_ARCH_HAS_ADD_PAGES
144 static inline int add_pages(int nid, unsigned long start_pfn,
145 unsigned long nr_pages, struct mhp_restrictions *restrictions)
147 return __add_pages(nid, start_pfn, nr_pages, restrictions);
149 #else /* ARCH_HAS_ADD_PAGES */
150 int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
151 struct mhp_restrictions *restrictions);
152 #endif /* ARCH_HAS_ADD_PAGES */
155 extern int memory_add_physaddr_to_nid(u64 start);
157 static inline int memory_add_physaddr_to_nid(u64 start)
163 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
165 * For supporting node-hotadd, we have to allocate a new pgdat.
167 * If an arch has generic style NODE_DATA(),
168 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
170 * In general, generic_alloc_nodedata() is used.
171 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
174 extern pg_data_t *arch_alloc_nodedata(int nid);
175 extern void arch_free_nodedata(pg_data_t *pgdat);
176 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
178 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
180 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
181 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
185 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
186 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
187 * Because, pgdat for the new node is not allocated/initialized yet itself.
188 * To use new node's memory, more consideration will be necessary.
190 #define generic_alloc_nodedata(nid) \
192 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
195 * This definition is just for error path in node hotadd.
196 * For node hotremove, we have to replace this.
198 #define generic_free_nodedata(pgdat) kfree(pgdat)
200 extern pg_data_t *node_data[];
201 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
203 node_data[nid] = pgdat;
206 #else /* !CONFIG_NUMA */
209 static inline pg_data_t *generic_alloc_nodedata(int nid)
214 static inline void generic_free_nodedata(pg_data_t *pgdat)
217 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
220 #endif /* CONFIG_NUMA */
221 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
223 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
224 extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat);
226 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
230 extern void put_page_bootmem(struct page *page);
231 extern void get_page_bootmem(unsigned long ingo, struct page *page,
234 void get_online_mems(void);
235 void put_online_mems(void);
237 void mem_hotplug_begin(void);
238 void mem_hotplug_done(void);
240 extern void set_zone_contiguous(struct zone *zone);
241 extern void clear_zone_contiguous(struct zone *zone);
243 #else /* ! CONFIG_MEMORY_HOTPLUG */
244 #define pfn_to_online_page(pfn) \
246 struct page *___page = NULL; \
247 if (pfn_valid(pfn)) \
248 ___page = pfn_to_page(pfn); \
252 static inline unsigned zone_span_seqbegin(struct zone *zone)
256 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
260 static inline void zone_span_writelock(struct zone *zone) {}
261 static inline void zone_span_writeunlock(struct zone *zone) {}
262 static inline void zone_seqlock_init(struct zone *zone) {}
264 static inline int mhp_notimplemented(const char *func)
266 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
271 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
275 static inline int try_online_node(int nid)
280 static inline void get_online_mems(void) {}
281 static inline void put_online_mems(void) {}
283 static inline void mem_hotplug_begin(void) {}
284 static inline void mem_hotplug_done(void) {}
286 static inline bool movable_node_is_enabled(void)
290 #endif /* ! CONFIG_MEMORY_HOTPLUG */
292 #if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT)
294 * pgdat resizing functions
297 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
299 spin_lock_irqsave(&pgdat->node_size_lock, *flags);
302 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
304 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
307 void pgdat_resize_init(struct pglist_data *pgdat)
309 spin_lock_init(&pgdat->node_size_lock);
311 #else /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
313 * Stub functions for when hotplug is off
315 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
316 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
317 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
318 #endif /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
320 #ifdef CONFIG_MEMORY_HOTREMOVE
322 extern bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
323 extern void try_offline_node(int nid);
324 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
325 extern int remove_memory(int nid, u64 start, u64 size);
326 extern void __remove_memory(int nid, u64 start, u64 size);
329 static inline bool is_mem_section_removable(unsigned long pfn,
330 unsigned long nr_pages)
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 __ref free_area_init_core_hotplug(int nid);
351 extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
352 void *arg, int (*func)(struct memory_block *, void *));
353 extern int __add_memory(int nid, u64 start, u64 size);
354 extern int add_memory(int nid, u64 start, u64 size);
355 extern int add_memory_resource(int nid, struct resource *resource);
356 extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
357 unsigned long nr_pages, struct vmem_altmap *altmap);
358 extern bool is_memblock_offlined(struct memory_block *mem);
359 extern int sparse_add_one_section(int nid, unsigned long start_pfn,
360 struct vmem_altmap *altmap);
361 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms,
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 */