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 * Restrictions for the memory hotplug:
63 * altmap: alternative allocator for memmap array
65 struct mhp_restrictions {
67 struct vmem_altmap *altmap;
71 * Zone resizing functions
73 * Note: any attempt to resize a zone should has pgdat_resize_lock()
74 * zone_span_writelock() both held. This ensure the size of a zone
75 * can't be changed while pgdat_resize_lock() held.
77 static inline unsigned zone_span_seqbegin(struct zone *zone)
79 return read_seqbegin(&zone->span_seqlock);
81 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
83 return read_seqretry(&zone->span_seqlock, iv);
85 static inline void zone_span_writelock(struct zone *zone)
87 write_seqlock(&zone->span_seqlock);
89 static inline void zone_span_writeunlock(struct zone *zone)
91 write_sequnlock(&zone->span_seqlock);
93 static inline void zone_seqlock_init(struct zone *zone)
95 seqlock_init(&zone->span_seqlock);
97 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
98 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
99 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
100 /* VM interface that may be used by firmware interface */
101 extern int online_pages(unsigned long pfn, unsigned long nr_pages,
102 int online_type, int nid);
103 extern struct zone *test_pages_in_a_zone(unsigned long start_pfn,
104 unsigned long end_pfn);
105 extern unsigned long __offline_isolated_pages(unsigned long start_pfn,
106 unsigned long end_pfn);
108 typedef void (*online_page_callback_t)(struct page *page, unsigned int order);
110 extern void generic_online_page(struct page *page, unsigned int order);
111 extern int set_online_page_callback(online_page_callback_t callback);
112 extern int restore_online_page_callback(online_page_callback_t callback);
114 extern int try_online_node(int nid);
116 extern int arch_add_memory(int nid, u64 start, u64 size,
117 struct mhp_restrictions *restrictions);
118 extern u64 max_mem_size;
120 extern int memhp_online_type_from_str(const char *str);
122 /* Default online_type (MMOP_*) when new memory blocks are added. */
123 extern int memhp_default_online_type;
124 /* If movable_node boot option specified */
125 extern bool movable_node_enabled;
126 static inline bool movable_node_is_enabled(void)
128 return movable_node_enabled;
131 extern void arch_remove_memory(int nid, u64 start, u64 size,
132 struct vmem_altmap *altmap);
133 extern void __remove_pages(unsigned long start_pfn, unsigned long nr_pages,
134 struct vmem_altmap *altmap);
136 /* reasonably generic interface to expand the physical pages */
137 extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
138 struct mhp_restrictions *restrictions);
140 #ifndef CONFIG_ARCH_HAS_ADD_PAGES
141 static inline int add_pages(int nid, unsigned long start_pfn,
142 unsigned long nr_pages, struct mhp_restrictions *restrictions)
144 return __add_pages(nid, start_pfn, nr_pages, restrictions);
146 #else /* ARCH_HAS_ADD_PAGES */
147 int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
148 struct mhp_restrictions *restrictions);
149 #endif /* ARCH_HAS_ADD_PAGES */
152 extern int memory_add_physaddr_to_nid(u64 start);
154 static inline int memory_add_physaddr_to_nid(u64 start)
160 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
162 * For supporting node-hotadd, we have to allocate a new pgdat.
164 * If an arch has generic style NODE_DATA(),
165 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
167 * In general, generic_alloc_nodedata() is used.
168 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
171 extern pg_data_t *arch_alloc_nodedata(int nid);
172 extern void arch_free_nodedata(pg_data_t *pgdat);
173 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
175 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
177 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
178 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
182 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
183 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
184 * Because, pgdat for the new node is not allocated/initialized yet itself.
185 * To use new node's memory, more consideration will be necessary.
187 #define generic_alloc_nodedata(nid) \
189 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
192 * This definition is just for error path in node hotadd.
193 * For node hotremove, we have to replace this.
195 #define generic_free_nodedata(pgdat) kfree(pgdat)
197 extern pg_data_t *node_data[];
198 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
200 node_data[nid] = pgdat;
203 #else /* !CONFIG_NUMA */
206 static inline pg_data_t *generic_alloc_nodedata(int nid)
211 static inline void generic_free_nodedata(pg_data_t *pgdat)
214 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
217 #endif /* CONFIG_NUMA */
218 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
220 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
221 extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat);
223 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
227 extern void put_page_bootmem(struct page *page);
228 extern void get_page_bootmem(unsigned long ingo, struct page *page,
231 void get_online_mems(void);
232 void put_online_mems(void);
234 void mem_hotplug_begin(void);
235 void mem_hotplug_done(void);
237 #else /* ! CONFIG_MEMORY_HOTPLUG */
238 #define pfn_to_online_page(pfn) \
240 struct page *___page = NULL; \
241 if (pfn_valid(pfn)) \
242 ___page = pfn_to_page(pfn); \
246 static inline unsigned zone_span_seqbegin(struct zone *zone)
250 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
254 static inline void zone_span_writelock(struct zone *zone) {}
255 static inline void zone_span_writeunlock(struct zone *zone) {}
256 static inline void zone_seqlock_init(struct zone *zone) {}
258 static inline int mhp_notimplemented(const char *func)
260 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
265 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
269 static inline int try_online_node(int nid)
274 static inline void get_online_mems(void) {}
275 static inline void put_online_mems(void) {}
277 static inline void mem_hotplug_begin(void) {}
278 static inline void mem_hotplug_done(void) {}
280 static inline bool movable_node_is_enabled(void)
284 #endif /* ! CONFIG_MEMORY_HOTPLUG */
286 #if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT)
288 * pgdat resizing functions
291 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
293 spin_lock_irqsave(&pgdat->node_size_lock, *flags);
296 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
298 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
301 void pgdat_resize_init(struct pglist_data *pgdat)
303 spin_lock_init(&pgdat->node_size_lock);
305 #else /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
307 * Stub functions for when hotplug is off
309 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
310 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
311 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
312 #endif /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
314 #ifdef CONFIG_MEMORY_HOTREMOVE
316 extern bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
317 extern void try_offline_node(int nid);
318 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
319 extern int remove_memory(int nid, u64 start, u64 size);
320 extern void __remove_memory(int nid, u64 start, u64 size);
323 static inline bool is_mem_section_removable(unsigned long pfn,
324 unsigned long nr_pages)
329 static inline void try_offline_node(int nid) {}
331 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
336 static inline int remove_memory(int nid, u64 start, u64 size)
341 static inline void __remove_memory(int nid, u64 start, u64 size) {}
342 #endif /* CONFIG_MEMORY_HOTREMOVE */
344 extern void set_zone_contiguous(struct zone *zone);
345 extern void clear_zone_contiguous(struct zone *zone);
347 extern void __ref free_area_init_core_hotplug(int nid);
348 extern int __add_memory(int nid, u64 start, u64 size);
349 extern int add_memory(int nid, u64 start, u64 size);
350 extern int add_memory_resource(int nid, struct resource *resource);
351 extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
352 unsigned long nr_pages, struct vmem_altmap *altmap);
353 extern void remove_pfn_range_from_zone(struct zone *zone,
354 unsigned long start_pfn,
355 unsigned long nr_pages);
356 extern bool is_memblock_offlined(struct memory_block *mem);
357 extern int sparse_add_section(int nid, unsigned long pfn,
358 unsigned long nr_pages, struct vmem_altmap *altmap);
359 extern void sparse_remove_section(struct mem_section *ms,
360 unsigned long pfn, unsigned long nr_pages,
361 unsigned long map_offset, struct vmem_altmap *altmap);
362 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
364 extern bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long nr_pages,
366 extern struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn,
367 unsigned long nr_pages);
368 #endif /* __LINUX_MEMORY_HOTPLUG_H */