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>
14 #ifdef CONFIG_MEMORY_HOTPLUG
17 * Types for free bootmem stored in page->lru.next. These have to be in
18 * some random range in unsigned long space for debugging purposes.
21 MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12,
22 SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE,
25 MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO,
29 * pgdat resizing functions
32 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
34 spin_lock_irqsave(&pgdat->node_size_lock, *flags);
37 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
39 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
42 void pgdat_resize_init(struct pglist_data *pgdat)
44 spin_lock_init(&pgdat->node_size_lock);
47 * Zone resizing functions
49 static inline unsigned zone_span_seqbegin(struct zone *zone)
51 return read_seqbegin(&zone->span_seqlock);
53 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
55 return read_seqretry(&zone->span_seqlock, iv);
57 static inline void zone_span_writelock(struct zone *zone)
59 write_seqlock(&zone->span_seqlock);
61 static inline void zone_span_writeunlock(struct zone *zone)
63 write_sequnlock(&zone->span_seqlock);
65 static inline void zone_seqlock_init(struct zone *zone)
67 seqlock_init(&zone->span_seqlock);
69 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
70 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
71 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
72 /* VM interface that may be used by firmware interface */
73 extern int online_pages(unsigned long, unsigned long);
74 extern void __offline_isolated_pages(unsigned long, unsigned long);
76 typedef void (*online_page_callback_t)(struct page *page);
78 extern int set_online_page_callback(online_page_callback_t callback);
79 extern int restore_online_page_callback(online_page_callback_t callback);
81 extern void __online_page_set_limits(struct page *page);
82 extern void __online_page_increment_counters(struct page *page);
83 extern void __online_page_free(struct page *page);
85 #ifdef CONFIG_MEMORY_HOTREMOVE
86 extern bool is_pageblock_removable_nolock(struct page *page);
87 #endif /* CONFIG_MEMORY_HOTREMOVE */
89 /* reasonably generic interface to expand the physical pages in a zone */
90 extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn,
91 unsigned long nr_pages);
92 extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
93 unsigned long nr_pages);
96 extern int memory_add_physaddr_to_nid(u64 start);
98 static inline int memory_add_physaddr_to_nid(u64 start)
104 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
106 * For supporting node-hotadd, we have to allocate a new pgdat.
108 * If an arch has generic style NODE_DATA(),
109 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
111 * In general, generic_alloc_nodedata() is used.
112 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
115 extern pg_data_t *arch_alloc_nodedata(int nid);
116 extern void arch_free_nodedata(pg_data_t *pgdat);
117 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
119 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
121 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
122 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
126 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
127 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
128 * Because, pgdat for the new node is not allocated/initialized yet itself.
129 * To use new node's memory, more consideration will be necessary.
131 #define generic_alloc_nodedata(nid) \
133 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
136 * This definition is just for error path in node hotadd.
137 * For node hotremove, we have to replace this.
139 #define generic_free_nodedata(pgdat) kfree(pgdat)
141 extern pg_data_t *node_data[];
142 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
144 node_data[nid] = pgdat;
147 #else /* !CONFIG_NUMA */
150 static inline pg_data_t *generic_alloc_nodedata(int nid)
155 static inline void generic_free_nodedata(pg_data_t *pgdat)
158 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
161 #endif /* CONFIG_NUMA */
162 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
164 #ifdef CONFIG_SPARSEMEM_VMEMMAP
165 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
168 static inline void put_page_bootmem(struct page *page)
172 extern void register_page_bootmem_info_node(struct pglist_data *pgdat);
173 extern void put_page_bootmem(struct page *page);
177 * Lock for memory hotplug guarantees 1) all callbacks for memory hotplug
178 * notifier will be called under this. 2) offline/online/add/remove memory
179 * will not run simultaneously.
182 void lock_memory_hotplug(void);
183 void unlock_memory_hotplug(void);
185 #else /* ! CONFIG_MEMORY_HOTPLUG */
187 * Stub functions for when hotplug is off
189 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
190 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
191 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
193 static inline unsigned zone_span_seqbegin(struct zone *zone)
197 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
201 static inline void zone_span_writelock(struct zone *zone) {}
202 static inline void zone_span_writeunlock(struct zone *zone) {}
203 static inline void zone_seqlock_init(struct zone *zone) {}
205 static inline int mhp_notimplemented(const char *func)
207 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
212 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
216 static inline void lock_memory_hotplug(void) {}
217 static inline void unlock_memory_hotplug(void) {}
219 #endif /* ! CONFIG_MEMORY_HOTPLUG */
221 #ifdef CONFIG_MEMORY_HOTREMOVE
223 extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
226 static inline int is_mem_section_removable(unsigned long pfn,
227 unsigned long nr_pages)
231 #endif /* CONFIG_MEMORY_HOTREMOVE */
233 extern int mem_online_node(int nid);
234 extern int add_memory(int nid, u64 start, u64 size);
235 extern int arch_add_memory(int nid, u64 start, u64 size);
236 extern int remove_memory(u64 start, u64 size);
237 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
239 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms);
240 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
243 #endif /* __LINUX_MEMORY_HOTPLUG_H */