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>
15 #ifdef CONFIG_MEMORY_HOTPLUG
18 * Types for free bootmem stored in page->lru.next. These have to be in
19 * some random range in unsigned long space for debugging purposes.
22 MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12,
23 SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE,
26 MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO,
29 /* Types for control the zone type of onlined memory */
37 * pgdat resizing functions
40 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
42 spin_lock_irqsave(&pgdat->node_size_lock, *flags);
45 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
47 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
50 void pgdat_resize_init(struct pglist_data *pgdat)
52 spin_lock_init(&pgdat->node_size_lock);
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 void __offline_isolated_pages(unsigned long, unsigned long);
88 typedef void (*online_page_callback_t)(struct page *page);
90 extern int set_online_page_callback(online_page_callback_t callback);
91 extern int restore_online_page_callback(online_page_callback_t callback);
93 extern void __online_page_set_limits(struct page *page);
94 extern void __online_page_increment_counters(struct page *page);
95 extern void __online_page_free(struct page *page);
97 #ifdef CONFIG_MEMORY_HOTREMOVE
98 extern bool is_pageblock_removable_nolock(struct page *page);
99 #endif /* CONFIG_MEMORY_HOTREMOVE */
101 /* reasonably generic interface to expand the physical pages in a zone */
102 extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn,
103 unsigned long nr_pages);
104 extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
105 unsigned long nr_pages);
108 extern int memory_add_physaddr_to_nid(u64 start);
110 static inline int memory_add_physaddr_to_nid(u64 start)
116 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
118 * For supporting node-hotadd, we have to allocate a new pgdat.
120 * If an arch has generic style NODE_DATA(),
121 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
123 * In general, generic_alloc_nodedata() is used.
124 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
127 extern pg_data_t *arch_alloc_nodedata(int nid);
128 extern void arch_free_nodedata(pg_data_t *pgdat);
129 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
131 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
133 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
134 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
138 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
139 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
140 * Because, pgdat for the new node is not allocated/initialized yet itself.
141 * To use new node's memory, more consideration will be necessary.
143 #define generic_alloc_nodedata(nid) \
145 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
148 * This definition is just for error path in node hotadd.
149 * For node hotremove, we have to replace this.
151 #define generic_free_nodedata(pgdat) kfree(pgdat)
153 extern pg_data_t *node_data[];
154 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
156 node_data[nid] = pgdat;
159 #else /* !CONFIG_NUMA */
162 static inline pg_data_t *generic_alloc_nodedata(int nid)
167 static inline void generic_free_nodedata(pg_data_t *pgdat)
170 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
173 #endif /* CONFIG_NUMA */
174 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
176 #ifdef CONFIG_SPARSEMEM_VMEMMAP
177 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
180 static inline void put_page_bootmem(struct page *page)
184 extern void register_page_bootmem_info_node(struct pglist_data *pgdat);
185 extern void put_page_bootmem(struct page *page);
189 * Lock for memory hotplug guarantees 1) all callbacks for memory hotplug
190 * notifier will be called under this. 2) offline/online/add/remove memory
191 * will not run simultaneously.
194 void lock_memory_hotplug(void);
195 void unlock_memory_hotplug(void);
197 #else /* ! CONFIG_MEMORY_HOTPLUG */
199 * Stub functions for when hotplug is off
201 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
202 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
203 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
205 static inline unsigned zone_span_seqbegin(struct zone *zone)
209 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
213 static inline void zone_span_writelock(struct zone *zone) {}
214 static inline void zone_span_writeunlock(struct zone *zone) {}
215 static inline void zone_seqlock_init(struct zone *zone) {}
217 static inline int mhp_notimplemented(const char *func)
219 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
224 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
228 static inline void lock_memory_hotplug(void) {}
229 static inline void unlock_memory_hotplug(void) {}
231 #endif /* ! CONFIG_MEMORY_HOTPLUG */
233 #ifdef CONFIG_MEMORY_HOTREMOVE
235 extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
238 static inline int is_mem_section_removable(unsigned long pfn,
239 unsigned long nr_pages)
243 #endif /* CONFIG_MEMORY_HOTREMOVE */
245 extern int mem_online_node(int nid);
246 extern int add_memory(int nid, u64 start, u64 size);
247 extern int arch_add_memory(int nid, u64 start, u64 size);
248 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
249 extern int offline_memory_block(struct memory_block *mem);
250 extern int remove_memory(u64 start, u64 size);
251 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
253 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms);
254 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
257 #endif /* __LINUX_MEMORY_HOTPLUG_H */