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>
16 #ifdef CONFIG_MEMORY_HOTPLUG
18 * Return page for the valid pfn only if the page is online. All pfn
19 * walkers which rely on the fully initialized page->flags and others
20 * should use this rather than pfn_valid && pfn_to_page
22 #define pfn_to_online_page(pfn) \
24 struct page *___page = NULL; \
25 unsigned long ___nr = pfn_to_section_nr(pfn); \
27 if (___nr < NR_MEM_SECTIONS && online_section_nr(___nr))\
28 ___page = pfn_to_page(pfn); \
33 * Types for free bootmem stored in page->lru.next. These have to be in
34 * some random range in unsigned long space for debugging purposes.
37 MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12,
38 SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE,
41 MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO,
44 /* Types for control the zone type of onlined and offlined memory */
53 * pgdat resizing functions
56 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
58 spin_lock_irqsave(&pgdat->node_size_lock, *flags);
61 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
63 spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
66 void pgdat_resize_init(struct pglist_data *pgdat)
68 spin_lock_init(&pgdat->node_size_lock);
71 * Zone resizing functions
73 * Note: any attempt to resize a zone should has pgdat_resize_lock()
74 * zone_span_writelock() both held. This ensure the size of a zone
75 * can't be changed while pgdat_resize_lock() held.
77 static inline unsigned zone_span_seqbegin(struct zone *zone)
79 return read_seqbegin(&zone->span_seqlock);
81 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
83 return read_seqretry(&zone->span_seqlock, iv);
85 static inline void zone_span_writelock(struct zone *zone)
87 write_seqlock(&zone->span_seqlock);
89 static inline void zone_span_writeunlock(struct zone *zone)
91 write_sequnlock(&zone->span_seqlock);
93 static inline void zone_seqlock_init(struct zone *zone)
95 seqlock_init(&zone->span_seqlock);
97 extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages);
98 extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages);
99 extern int add_one_highpage(struct page *page, int pfn, int bad_ppro);
100 /* VM interface that may be used by firmware interface */
101 extern int online_pages(unsigned long, unsigned long, int);
102 extern int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn,
103 unsigned long *valid_start, unsigned long *valid_end);
104 extern void __offline_isolated_pages(unsigned long, unsigned long);
106 typedef void (*online_page_callback_t)(struct page *page);
108 extern int set_online_page_callback(online_page_callback_t callback);
109 extern int restore_online_page_callback(online_page_callback_t callback);
111 extern void __online_page_set_limits(struct page *page);
112 extern void __online_page_increment_counters(struct page *page);
113 extern void __online_page_free(struct page *page);
115 extern int try_online_node(int nid);
117 extern bool memhp_auto_online;
119 #ifdef CONFIG_MEMORY_HOTREMOVE
120 extern bool is_pageblock_removable_nolock(struct page *page);
121 extern int arch_remove_memory(u64 start, u64 size);
122 extern int __remove_pages(struct zone *zone, unsigned long start_pfn,
123 unsigned long nr_pages);
124 #endif /* CONFIG_MEMORY_HOTREMOVE */
126 /* reasonably generic interface to expand the physical pages */
127 extern int __add_pages(int nid, unsigned long start_pfn,
128 unsigned long nr_pages, bool want_memblock);
131 extern int memory_add_physaddr_to_nid(u64 start);
133 static inline int memory_add_physaddr_to_nid(u64 start)
139 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
141 * For supporting node-hotadd, we have to allocate a new pgdat.
143 * If an arch has generic style NODE_DATA(),
144 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
146 * In general, generic_alloc_nodedata() is used.
147 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
150 extern pg_data_t *arch_alloc_nodedata(int nid);
151 extern void arch_free_nodedata(pg_data_t *pgdat);
152 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
154 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
156 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
157 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
161 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
162 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
163 * Because, pgdat for the new node is not allocated/initialized yet itself.
164 * To use new node's memory, more consideration will be necessary.
166 #define generic_alloc_nodedata(nid) \
168 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
171 * This definition is just for error path in node hotadd.
172 * For node hotremove, we have to replace this.
174 #define generic_free_nodedata(pgdat) kfree(pgdat)
176 extern pg_data_t *node_data[];
177 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
179 node_data[nid] = pgdat;
182 #else /* !CONFIG_NUMA */
185 static inline pg_data_t *generic_alloc_nodedata(int nid)
190 static inline void generic_free_nodedata(pg_data_t *pgdat)
193 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
196 #endif /* CONFIG_NUMA */
197 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
199 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
200 extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat);
202 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
206 extern void put_page_bootmem(struct page *page);
207 extern void get_page_bootmem(unsigned long ingo, struct page *page,
210 void get_online_mems(void);
211 void put_online_mems(void);
213 void mem_hotplug_begin(void);
214 void mem_hotplug_done(void);
216 extern void set_zone_contiguous(struct zone *zone);
217 extern void clear_zone_contiguous(struct zone *zone);
219 #else /* ! CONFIG_MEMORY_HOTPLUG */
220 #define pfn_to_online_page(pfn) \
222 struct page *___page = NULL; \
223 if (pfn_valid(pfn)) \
224 ___page = pfn_to_page(pfn); \
229 * Stub functions for when hotplug is off
231 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
232 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
233 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
235 static inline unsigned zone_span_seqbegin(struct zone *zone)
239 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
243 static inline void zone_span_writelock(struct zone *zone) {}
244 static inline void zone_span_writeunlock(struct zone *zone) {}
245 static inline void zone_seqlock_init(struct zone *zone) {}
247 static inline int mhp_notimplemented(const char *func)
249 printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func);
254 static inline void register_page_bootmem_info_node(struct pglist_data *pgdat)
258 static inline int try_online_node(int nid)
263 static inline void get_online_mems(void) {}
264 static inline void put_online_mems(void) {}
266 static inline void mem_hotplug_begin(void) {}
267 static inline void mem_hotplug_done(void) {}
269 #endif /* ! CONFIG_MEMORY_HOTPLUG */
271 #ifdef CONFIG_MEMORY_HOTREMOVE
273 extern bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages);
274 extern void try_offline_node(int nid);
275 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
276 extern void remove_memory(int nid, u64 start, u64 size);
279 static inline bool is_mem_section_removable(unsigned long pfn,
280 unsigned long nr_pages)
285 static inline void try_offline_node(int nid) {}
287 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
292 static inline void remove_memory(int nid, u64 start, u64 size) {}
293 #endif /* CONFIG_MEMORY_HOTREMOVE */
295 extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
296 void *arg, int (*func)(struct memory_block *, void *));
297 extern int add_memory(int nid, u64 start, u64 size);
298 extern int add_memory_resource(int nid, struct resource *resource, bool online);
299 extern int zone_for_memory(int nid, u64 start, u64 size, int zone_default,
301 extern int arch_add_memory(int nid, u64 start, u64 size, bool for_device);
302 extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
303 unsigned long nr_pages);
304 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages);
305 extern bool is_memblock_offlined(struct memory_block *mem);
306 extern void remove_memory(int nid, u64 start, u64 size);
307 extern int sparse_add_one_section(struct pglist_data *pgdat, unsigned long start_pfn);
308 extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms,
309 unsigned long map_offset);
310 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
312 extern bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long nr_pages,
314 #endif /* __LINUX_MEMORY_HOTPLUG_H */