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>
13 #ifdef CONFIG_MEMORY_HOTPLUG
16 * Types for free bootmem.
17 * The normal smallest mapcount is -1. Here is smaller value than it.
19 #define SECTION_INFO (-1 - 1)
20 #define MIX_SECTION_INFO (-1 - 2)
21 #define NODE_INFO (-1 - 3)
24 * pgdat resizing functions
27 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
29 spin_lock_irqsave(&pgdat->node_size_lock, *flags);
32 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
34 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
37 void pgdat_resize_init(struct pglist_data *pgdat)
39 spin_lock_init(&pgdat->node_size_lock);
42 * Zone resizing functions
44 static inline unsigned zone_span_seqbegin(struct zone *zone)
46 return read_seqbegin(&zone->span_seqlock);
48 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
50 return read_seqretry(&zone->span_seqlock, iv);
52 static inline void zone_span_writelock(struct zone *zone)
54 write_seqlock(&zone->span_seqlock);
56 static inline void zone_span_writeunlock(struct zone *zone)
58 write_sequnlock(&zone->span_seqlock);
60 static inline void zone_seqlock_init(struct zone *zone)
62 seqlock_init(&zone->span_seqlock);
64 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
65 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
66 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
67 /* need some defines for these for archs that don't support it */
68 extern void online_page(struct page *page);
69 /* VM interface that may be used by firmware interface */
70 extern int online_pages(unsigned long, unsigned long);
71 extern void __offline_isolated_pages(unsigned long, unsigned long);
72 extern int offline_pages(unsigned long, unsigned long, unsigned long);
74 /* reasonably generic interface to expand the physical pages in a zone */
75 extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn,
76 unsigned long nr_pages);
77 extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
78 unsigned long nr_pages);
81 extern int memory_add_physaddr_to_nid(u64 start);
83 static inline int memory_add_physaddr_to_nid(u64 start)
89 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
91 * For supporting node-hotadd, we have to allocate a new pgdat.
93 * If an arch has generic style NODE_DATA(),
94 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
96 * In general, generic_alloc_nodedata() is used.
97 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
100 extern pg_data_t *arch_alloc_nodedata(int nid);
101 extern void arch_free_nodedata(pg_data_t *pgdat);
102 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
104 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
106 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
107 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
111 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
112 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
113 * Because, pgdat for the new node is not allocated/initialized yet itself.
114 * To use new node's memory, more consideration will be necessary.
116 #define generic_alloc_nodedata(nid) \
118 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
121 * This definition is just for error path in node hotadd.
122 * For node hotremove, we have to replace this.
124 #define generic_free_nodedata(pgdat) kfree(pgdat)
126 extern pg_data_t *node_data[];
127 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
129 node_data[nid] = pgdat;
132 #else /* !CONFIG_NUMA */
135 static inline pg_data_t *generic_alloc_nodedata(int nid)
140 static inline void generic_free_nodedata(pg_data_t *pgdat)
143 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
146 #endif /* CONFIG_NUMA */
147 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
149 #ifdef CONFIG_SPARSEMEM_VMEMMAP
150 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
153 static inline void put_page_bootmem(struct page *page)
157 extern void register_page_bootmem_info_node(struct pglist_data *pgdat);
158 extern void put_page_bootmem(struct page *page);
161 #else /* ! CONFIG_MEMORY_HOTPLUG */
163 * Stub functions for when hotplug is off
165 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
166 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
167 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
169 static inline unsigned zone_span_seqbegin(struct zone *zone)
173 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
177 static inline void zone_span_writelock(struct zone *zone) {}
178 static inline void zone_span_writeunlock(struct zone *zone) {}
179 static inline void zone_seqlock_init(struct zone *zone) {}
181 static inline int mhp_notimplemented(const char *func)
183 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
188 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
192 #endif /* ! CONFIG_MEMORY_HOTPLUG */
195 * Walk through all memory which is registered as resource.
196 * arg is (start_pfn, nr_pages, private_arg_pointer)
198 extern int walk_memory_resource(unsigned long start_pfn,
199 unsigned long nr_pages, void *arg,
200 int (*func)(unsigned long, unsigned long, void *));
202 #ifdef CONFIG_MEMORY_HOTREMOVE
204 extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
207 static inline int is_mem_section_removable(unsigned long pfn,
208 unsigned long nr_pages)
212 #endif /* CONFIG_MEMORY_HOTREMOVE */
214 extern int add_memory(int nid, u64 start, u64 size);
215 extern int arch_add_memory(int nid, u64 start, u64 size);
216 extern int remove_memory(u64 start, u64 size);
217 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn,
219 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms);
220 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
223 #endif /* __LINUX_MEMORY_HOTPLUG_H */