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 extern int try_online_node(int nid);
99 #ifdef CONFIG_MEMORY_HOTREMOVE
100 extern bool is_pageblock_removable_nolock(struct page *page);
101 extern int arch_remove_memory(u64 start, u64 size);
102 extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
103 unsigned long nr_pages);
104 #endif /* CONFIG_MEMORY_HOTREMOVE */
106 /* reasonably generic interface to expand the physical pages in a zone */
107 extern int __add_pages(int nid, struct zone *zone, unsigned long start_pfn,
108 unsigned long nr_pages);
111 extern int memory_add_physaddr_to_nid(u64 start);
113 static inline int memory_add_physaddr_to_nid(u64 start)
119 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
121 * For supporting node-hotadd, we have to allocate a new pgdat.
123 * If an arch has generic style NODE_DATA(),
124 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
126 * In general, generic_alloc_nodedata() is used.
127 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
130 extern pg_data_t *arch_alloc_nodedata(int nid);
131 extern void arch_free_nodedata(pg_data_t *pgdat);
132 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
134 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
136 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
137 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
141 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
142 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
143 * Because, pgdat for the new node is not allocated/initialized yet itself.
144 * To use new node's memory, more consideration will be necessary.
146 #define generic_alloc_nodedata(nid) \
148 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
151 * This definition is just for error path in node hotadd.
152 * For node hotremove, we have to replace this.
154 #define generic_free_nodedata(pgdat) kfree(pgdat)
156 extern pg_data_t *node_data[];
157 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
159 node_data[nid] = pgdat;
162 #else /* !CONFIG_NUMA */
165 static inline pg_data_t *generic_alloc_nodedata(int nid)
170 static inline void generic_free_nodedata(pg_data_t *pgdat)
173 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
176 #endif /* CONFIG_NUMA */
177 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
179 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
180 extern void register_page_bootmem_info_node(struct pglist_data *pgdat);
182 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
186 extern void put_page_bootmem(struct page *page);
187 extern void get_page_bootmem(unsigned long ingo, struct page *page,
191 * Lock for memory hotplug guarantees 1) all callbacks for memory hotplug
192 * notifier will be called under this. 2) offline/online/add/remove memory
193 * will not run simultaneously.
196 void lock_memory_hotplug(void);
197 void unlock_memory_hotplug(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 lock_memory_hotplug(void) {}
236 static inline void unlock_memory_hotplug(void) {}
238 #endif /* ! CONFIG_MEMORY_HOTPLUG */
240 #ifdef CONFIG_MEMORY_HOTREMOVE
242 extern int is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
243 extern void try_offline_node(int nid);
244 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
245 extern void remove_memory(int nid, u64 start, u64 size);
248 static inline int is_mem_section_removable(unsigned long pfn,
249 unsigned long nr_pages)
254 static inline void try_offline_node(int nid) {}
256 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
261 static inline void remove_memory(int nid, u64 start, u64 size) {}
262 #endif /* CONFIG_MEMORY_HOTREMOVE */
264 extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
265 void *arg, int (*func)(struct memory_block *, void *));
266 extern int add_memory(int nid, u64 start, u64 size);
267 extern int arch_add_memory(int nid, u64 start, u64 size);
268 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
269 extern bool is_memblock_offlined(struct memory_block *mem);
270 extern void remove_memory(int nid, u64 start, u64 size);
271 extern int sparse_add_one_section(struct zone *zone, unsigned long start_pfn);
272 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms);
273 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
276 #endif /* __LINUX_MEMORY_HOTPLUG_H */