1 #ifndef __LINUX_MEMORY_HOTPLUG_H
2 #define __LINUX_MEMORY_HOTPLUG_H
4 #include <linux/mmzone.h>
5 #include <linux/spinlock.h>
6 #include <linux/notifier.h>
16 #ifdef CONFIG_MEMORY_HOTPLUG
19 * Types for free bootmem stored in page->lru.next. These have to be in
20 * some random range in unsigned long space for debugging purposes.
23 MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12,
24 SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE,
27 MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO,
30 /* Types for control the zone type of onlined and offlined memory */
39 * pgdat resizing functions
42 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
44 spin_lock_irqsave(&pgdat->node_size_lock, *flags);
47 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
49 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
52 void pgdat_resize_init(struct pglist_data *pgdat)
54 spin_lock_init(&pgdat->node_size_lock);
57 * Zone resizing functions
59 * Note: any attempt to resize a zone should has pgdat_resize_lock()
60 * zone_span_writelock() both held. This ensure the size of a zone
61 * can't be changed while pgdat_resize_lock() held.
63 static inline unsigned zone_span_seqbegin(struct zone *zone)
65 return read_seqbegin(&zone->span_seqlock);
67 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
69 return read_seqretry(&zone->span_seqlock, iv);
71 static inline void zone_span_writelock(struct zone *zone)
73 write_seqlock(&zone->span_seqlock);
75 static inline void zone_span_writeunlock(struct zone *zone)
77 write_sequnlock(&zone->span_seqlock);
79 static inline void zone_seqlock_init(struct zone *zone)
81 seqlock_init(&zone->span_seqlock);
83 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
84 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
85 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
86 /* VM interface that may be used by firmware interface */
87 extern int online_pages(unsigned long, unsigned long, int);
88 extern int test_pages_in_a_zone(unsigned long, unsigned long);
89 extern void __offline_isolated_pages(unsigned long, unsigned long);
91 typedef void (*online_page_callback_t)(struct page *page);
93 extern int set_online_page_callback(online_page_callback_t callback);
94 extern int restore_online_page_callback(online_page_callback_t callback);
96 extern void __online_page_set_limits(struct page *page);
97 extern void __online_page_increment_counters(struct page *page);
98 extern void __online_page_free(struct page *page);
100 extern int try_online_node(int nid);
102 #ifdef CONFIG_MEMORY_HOTREMOVE
103 extern bool is_pageblock_removable_nolock(struct page *page);
104 extern int arch_remove_memory(u64 start, u64 size);
105 extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
106 unsigned long nr_pages);
107 #endif /* CONFIG_MEMORY_HOTREMOVE */
109 /* reasonably generic interface to expand the physical pages in a zone */
110 extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn,
111 unsigned long nr_pages);
114 extern int memory_add_physaddr_to_nid(u64 start);
116 static inline int memory_add_physaddr_to_nid(u64 start)
122 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
124 * For supporting node-hotadd, we have to allocate a new pgdat.
126 * If an arch has generic style NODE_DATA(),
127 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
129 * In general, generic_alloc_nodedata() is used.
130 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
133 extern pg_data_t *arch_alloc_nodedata(int nid);
134 extern void arch_free_nodedata(pg_data_t *pgdat);
135 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
137 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
139 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
140 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
144 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
145 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
146 * Because, pgdat for the new node is not allocated/initialized yet itself.
147 * To use new node's memory, more consideration will be necessary.
149 #define generic_alloc_nodedata(nid) \
151 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
154 * This definition is just for error path in node hotadd.
155 * For node hotremove, we have to replace this.
157 #define generic_free_nodedata(pgdat) kfree(pgdat)
159 extern pg_data_t *node_data[];
160 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
162 node_data[nid] = pgdat;
165 #else /* !CONFIG_NUMA */
168 static inline pg_data_t *generic_alloc_nodedata(int nid)
173 static inline void generic_free_nodedata(pg_data_t *pgdat)
176 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
179 #endif /* CONFIG_NUMA */
180 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
182 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
183 extern void register_page_bootmem_info_node(struct pglist_data *pgdat);
185 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
189 extern void put_page_bootmem(struct page *page);
190 extern void get_page_bootmem(unsigned long ingo, struct page *page,
193 void get_online_mems(void);
194 void put_online_mems(void);
196 void mem_hotplug_begin(void);
197 void mem_hotplug_done(void);
199 #else /* ! CONFIG_MEMORY_HOTPLUG */
201 * Stub functions for when hotplug is off
203 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
204 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
205 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
207 static inline unsigned zone_span_seqbegin(struct zone *zone)
211 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
215 static inline void zone_span_writelock(struct zone *zone) {}
216 static inline void zone_span_writeunlock(struct zone *zone) {}
217 static inline void zone_seqlock_init(struct zone *zone) {}
219 static inline int mhp_notimplemented(const char *func)
221 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
226 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
230 static inline int try_online_node(int nid)
235 static inline void get_online_mems(void) {}
236 static inline void put_online_mems(void) {}
238 static inline void mem_hotplug_begin(void) {}
239 static inline void mem_hotplug_done(void) {}
241 #endif /* ! CONFIG_MEMORY_HOTPLUG */
243 #ifdef CONFIG_MEMORY_HOTREMOVE
245 extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
246 extern void try_offline_node(int nid);
247 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
248 extern void remove_memory(int nid, u64 start, u64 size);
251 static inline int is_mem_section_removable(unsigned long pfn,
252 unsigned long nr_pages)
257 static inline void try_offline_node(int nid) {}
259 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
264 static inline void remove_memory(int nid, u64 start, u64 size) {}
265 #endif /* CONFIG_MEMORY_HOTREMOVE */
267 extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
268 void *arg, int (*func)(struct memory_block *, void *));
269 extern int add_memory(int nid, u64 start, u64 size);
270 extern int add_memory_resource(int nid, struct resource *resource);
271 extern int zone_for_memory(int nid, u64 start, u64 size, int zone_default,
273 extern int arch_add_memory(int nid, u64 start, u64 size, bool for_device);
274 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
275 extern bool is_memblock_offlined(struct memory_block *mem);
276 extern void remove_memory(int nid, u64 start, u64 size);
277 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn);
278 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms,
279 unsigned long map_offset);
280 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
283 #endif /* __LINUX_MEMORY_HOTPLUG_H */