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 and offlined memory */
38 * pgdat resizing functions
41 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
43 spin_lock_irqsave(&pgdat->node_size_lock, *flags);
46 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
48 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
51 void pgdat_resize_init(struct pglist_data *pgdat)
53 spin_lock_init(&pgdat->node_size_lock);
56 * Zone resizing functions
58 * Note: any attempt to resize a zone should has pgdat_resize_lock()
59 * zone_span_writelock() both held. This ensure the size of a zone
60 * can't be changed while pgdat_resize_lock() held.
62 static inline unsigned zone_span_seqbegin(struct zone *zone)
64 return read_seqbegin(&zone->span_seqlock);
66 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
68 return read_seqretry(&zone->span_seqlock, iv);
70 static inline void zone_span_writelock(struct zone *zone)
72 write_seqlock(&zone->span_seqlock);
74 static inline void zone_span_writeunlock(struct zone *zone)
76 write_sequnlock(&zone->span_seqlock);
78 static inline void zone_seqlock_init(struct zone *zone)
80 seqlock_init(&zone->span_seqlock);
82 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
83 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
84 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
85 /* VM interface that may be used by firmware interface */
86 extern int online_pages(unsigned long, unsigned long, int);
87 extern int test_pages_in_a_zone(unsigned long, unsigned long);
88 extern void __offline_isolated_pages(unsigned long, unsigned long);
90 typedef void (*online_page_callback_t)(struct page *page);
92 extern int set_online_page_callback(online_page_callback_t callback);
93 extern int restore_online_page_callback(online_page_callback_t callback);
95 extern void __online_page_set_limits(struct page *page);
96 extern void __online_page_increment_counters(struct page *page);
97 extern void __online_page_free(struct page *page);
99 extern int try_online_node(int nid);
101 #ifdef CONFIG_MEMORY_HOTREMOVE
102 extern bool is_pageblock_removable_nolock(struct page *page);
103 extern int arch_remove_memory(u64 start, u64 size);
104 extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
105 unsigned long nr_pages);
106 #endif /* CONFIG_MEMORY_HOTREMOVE */
108 /* reasonably generic interface to expand the physical pages in a zone */
109 extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn,
110 unsigned long nr_pages);
113 extern int memory_add_physaddr_to_nid(u64 start);
115 static inline int memory_add_physaddr_to_nid(u64 start)
121 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
123 * For supporting node-hotadd, we have to allocate a new pgdat.
125 * If an arch has generic style NODE_DATA(),
126 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
128 * In general, generic_alloc_nodedata() is used.
129 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
132 extern pg_data_t *arch_alloc_nodedata(int nid);
133 extern void arch_free_nodedata(pg_data_t *pgdat);
134 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
136 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
138 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
139 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
143 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
144 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
145 * Because, pgdat for the new node is not allocated/initialized yet itself.
146 * To use new node's memory, more consideration will be necessary.
148 #define generic_alloc_nodedata(nid) \
150 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
153 * This definition is just for error path in node hotadd.
154 * For node hotremove, we have to replace this.
156 #define generic_free_nodedata(pgdat) kfree(pgdat)
158 extern pg_data_t *node_data[];
159 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
161 node_data[nid] = pgdat;
164 #else /* !CONFIG_NUMA */
167 static inline pg_data_t *generic_alloc_nodedata(int nid)
172 static inline void generic_free_nodedata(pg_data_t *pgdat)
175 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
178 #endif /* CONFIG_NUMA */
179 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
181 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
182 extern void register_page_bootmem_info_node(struct pglist_data *pgdat);
184 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
188 extern void put_page_bootmem(struct page *page);
189 extern void get_page_bootmem(unsigned long ingo, struct page *page,
192 void get_online_mems(void);
193 void put_online_mems(void);
195 void mem_hotplug_begin(void);
196 void mem_hotplug_done(void);
198 #else /* ! CONFIG_MEMORY_HOTPLUG */
200 * Stub functions for when hotplug is off
202 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
203 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
204 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
206 static inline unsigned zone_span_seqbegin(struct zone *zone)
210 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
214 static inline void zone_span_writelock(struct zone *zone) {}
215 static inline void zone_span_writeunlock(struct zone *zone) {}
216 static inline void zone_seqlock_init(struct zone *zone) {}
218 static inline int mhp_notimplemented(const char *func)
220 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
225 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
229 static inline int try_online_node(int nid)
234 static inline void get_online_mems(void) {}
235 static inline void put_online_mems(void) {}
237 static inline void mem_hotplug_begin(void) {}
238 static inline void mem_hotplug_done(void) {}
240 #endif /* ! CONFIG_MEMORY_HOTPLUG */
242 #ifdef CONFIG_MEMORY_HOTREMOVE
244 extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
245 extern void try_offline_node(int nid);
246 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
247 extern void remove_memory(int nid, u64 start, u64 size);
250 static inline int is_mem_section_removable(unsigned long pfn,
251 unsigned long nr_pages)
256 static inline void try_offline_node(int nid) {}
258 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
263 static inline void remove_memory(int nid, u64 start, u64 size) {}
264 #endif /* CONFIG_MEMORY_HOTREMOVE */
266 extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
267 void *arg, int (*func)(struct memory_block *, void *));
268 extern int add_memory(int nid, u64 start, u64 size);
269 extern int zone_for_memory(int nid, u64 start, u64 size, int zone_default);
270 extern int arch_add_memory(int nid, u64 start, u64 size);
271 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
272 extern bool is_memblock_offlined(struct memory_block *mem);
273 extern void remove_memory(int nid, u64 start, u64 size);
274 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn);
275 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms);
276 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
279 #endif /* __LINUX_MEMORY_HOTPLUG_H */