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
19 * Types for free bootmem stored in page->lru.next. These have to be in
20 * some random range in unsigned long space for debugging purposes.
23 MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE
= 12,
24 SECTION_INFO
= MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE
,
27 MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE
= NODE_INFO
,
30 /* Types for control the zone type of onlined and offlined memory */
39 * pgdat resizing functions
42 void pgdat_resize_lock(struct pglist_data
*pgdat
, unsigned long *flags
)
44 spin_lock_irqsave(&pgdat
->node_size_lock
, *flags
);
47 void pgdat_resize_unlock(struct pglist_data
*pgdat
, unsigned long *flags
)
49 spin_unlock_irqrestore(&pgdat
->node_size_lock
, *flags
);
52 void pgdat_resize_init(struct pglist_data
*pgdat
)
54 spin_lock_init(&pgdat
->node_size_lock
);
57 * Zone resizing functions
59 * Note: any attempt to resize a zone should has pgdat_resize_lock()
60 * zone_span_writelock() both held. This ensure the size of a zone
61 * can't be changed while pgdat_resize_lock() held.
63 static inline unsigned zone_span_seqbegin(struct zone
*zone
)
65 return read_seqbegin(&zone
->span_seqlock
);
67 static inline int zone_span_seqretry(struct zone
*zone
, unsigned iv
)
69 return read_seqretry(&zone
->span_seqlock
, iv
);
71 static inline void zone_span_writelock(struct zone
*zone
)
73 write_seqlock(&zone
->span_seqlock
);
75 static inline void zone_span_writeunlock(struct zone
*zone
)
77 write_sequnlock(&zone
->span_seqlock
);
79 static inline void zone_seqlock_init(struct zone
*zone
)
81 seqlock_init(&zone
->span_seqlock
);
83 extern int zone_grow_free_lists(struct zone
*zone
, unsigned long new_nr_pages
);
84 extern int zone_grow_waitqueues(struct zone
*zone
, unsigned long nr_pages
);
85 extern int add_one_highpage(struct page
*page
, int pfn
, int bad_ppro
);
86 /* VM interface that may be used by firmware interface */
87 extern int online_pages(unsigned long, unsigned long, int);
88 extern int test_pages_in_a_zone(unsigned long, unsigned long);
89 extern void __offline_isolated_pages(unsigned long, unsigned long);
91 typedef void (*online_page_callback_t
)(struct page
*page
);
93 extern int set_online_page_callback(online_page_callback_t callback
);
94 extern int restore_online_page_callback(online_page_callback_t callback
);
96 extern void __online_page_set_limits(struct page
*page
);
97 extern void __online_page_increment_counters(struct page
*page
);
98 extern void __online_page_free(struct page
*page
);
100 extern int try_online_node(int nid
);
102 #ifdef CONFIG_MEMORY_HOTREMOVE
103 extern bool is_pageblock_removable_nolock(struct page
*page
);
104 extern int arch_remove_memory(u64 start
, u64 size
);
105 extern int __remove_pages(struct zone
*zone
, unsigned long start_pfn
,
106 unsigned long nr_pages
);
107 #endif /* CONFIG_MEMORY_HOTREMOVE */
109 /* reasonably generic interface to expand the physical pages in a zone */
110 extern int __add_pages(int nid
, struct zone
*zone
, unsigned long start_pfn
,
111 unsigned long nr_pages
);
114 extern int memory_add_physaddr_to_nid(u64 start
);
116 static inline int memory_add_physaddr_to_nid(u64 start
)
122 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
124 * For supporting node-hotadd, we have to allocate a new pgdat.
126 * If an arch has generic style NODE_DATA(),
127 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
129 * In general, generic_alloc_nodedata() is used.
130 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
133 extern pg_data_t
*arch_alloc_nodedata(int nid
);
134 extern void arch_free_nodedata(pg_data_t
*pgdat
);
135 extern void arch_refresh_nodedata(int nid
, pg_data_t
*pgdat
);
137 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
139 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
140 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
144 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
145 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
146 * Because, pgdat for the new node is not allocated/initialized yet itself.
147 * To use new node's memory, more consideration will be necessary.
149 #define generic_alloc_nodedata(nid) \
151 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
154 * This definition is just for error path in node hotadd.
155 * For node hotremove, we have to replace this.
157 #define generic_free_nodedata(pgdat) kfree(pgdat)
159 extern pg_data_t
*node_data
[];
160 static inline void arch_refresh_nodedata(int nid
, pg_data_t
*pgdat
)
162 node_data
[nid
] = pgdat
;
165 #else /* !CONFIG_NUMA */
168 static inline pg_data_t
*generic_alloc_nodedata(int nid
)
173 static inline void generic_free_nodedata(pg_data_t
*pgdat
)
176 static inline void arch_refresh_nodedata(int nid
, pg_data_t
*pgdat
)
179 #endif /* CONFIG_NUMA */
180 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
182 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
183 extern void register_page_bootmem_info_node(struct pglist_data
*pgdat
);
185 static inline void register_page_bootmem_info_node(struct pglist_data
*pgdat
)
189 extern void put_page_bootmem(struct page
*page
);
190 extern void get_page_bootmem(unsigned long ingo
, struct page
*page
,
193 void get_online_mems(void);
194 void put_online_mems(void);
196 void mem_hotplug_begin(void);
197 void mem_hotplug_done(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 get_online_mems(void) {}
236 static inline void put_online_mems(void) {}
238 static inline void mem_hotplug_begin(void) {}
239 static inline void mem_hotplug_done(void) {}
241 #endif /* ! CONFIG_MEMORY_HOTPLUG */
243 #ifdef CONFIG_MEMORY_HOTREMOVE
245 extern int is_mem_section_removable(unsigned long pfn
, unsigned long nr_pages
);
246 extern void try_offline_node(int nid
);
247 extern int offline_pages(unsigned long start_pfn
, unsigned long nr_pages
);
248 extern void remove_memory(int nid
, u64 start
, u64 size
);
251 static inline int is_mem_section_removable(unsigned long pfn
,
252 unsigned long nr_pages
)
257 static inline void try_offline_node(int nid
) {}
259 static inline int offline_pages(unsigned long start_pfn
, unsigned long nr_pages
)
264 static inline void remove_memory(int nid
, u64 start
, u64 size
) {}
265 #endif /* CONFIG_MEMORY_HOTREMOVE */
267 extern int walk_memory_range(unsigned long start_pfn
, unsigned long end_pfn
,
268 void *arg
, int (*func
)(struct memory_block
*, void *));
269 extern int add_memory(int nid
, u64 start
, u64 size
);
270 extern int add_memory_resource(int nid
, struct resource
*resource
);
271 extern int zone_for_memory(int nid
, u64 start
, u64 size
, int zone_default
,
273 extern int arch_add_memory(int nid
, u64 start
, u64 size
, bool for_device
);
274 extern int offline_pages(unsigned long start_pfn
, unsigned long nr_pages
);
275 extern bool is_memblock_offlined(struct memory_block
*mem
);
276 extern void remove_memory(int nid
, u64 start
, u64 size
);
277 extern int sparse_add_one_section(struct zone
*zone
, unsigned long start_pfn
);
278 extern void sparse_remove_one_section(struct zone
*zone
, struct mem_section
*ms
,
279 unsigned long map_offset
);
280 extern struct page
*sparse_decode_mem_map(unsigned long coded_mem_map
,
283 #endif /* __LINUX_MEMORY_HOTPLUG_H */