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 void __offline_isolated_pages(unsigned long, unsigned long);
89 typedef void (*online_page_callback_t
)(struct page
*page
);
91 extern int set_online_page_callback(online_page_callback_t callback
);
92 extern int restore_online_page_callback(online_page_callback_t callback
);
94 extern void __online_page_set_limits(struct page
*page
);
95 extern void __online_page_increment_counters(struct page
*page
);
96 extern void __online_page_free(struct page
*page
);
98 extern int try_online_node(int nid
);
100 #ifdef CONFIG_MEMORY_HOTREMOVE
101 extern bool is_pageblock_removable_nolock(struct page
*page
);
102 extern int arch_remove_memory(u64 start
, u64 size
);
103 extern int __remove_pages(struct zone
*zone
, unsigned long start_pfn
,
104 unsigned long nr_pages
);
105 #endif /* CONFIG_MEMORY_HOTREMOVE */
107 /* reasonably generic interface to expand the physical pages in a zone */
108 extern int __add_pages(int nid
, struct zone
*zone
, unsigned long start_pfn
,
109 unsigned long nr_pages
);
112 extern int memory_add_physaddr_to_nid(u64 start
);
114 static inline int memory_add_physaddr_to_nid(u64 start
)
120 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
122 * For supporting node-hotadd, we have to allocate a new pgdat.
124 * If an arch has generic style NODE_DATA(),
125 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
127 * In general, generic_alloc_nodedata() is used.
128 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
131 extern pg_data_t
*arch_alloc_nodedata(int nid
);
132 extern void arch_free_nodedata(pg_data_t
*pgdat
);
133 extern void arch_refresh_nodedata(int nid
, pg_data_t
*pgdat
);
135 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
137 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
138 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
142 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
143 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
144 * Because, pgdat for the new node is not allocated/initialized yet itself.
145 * To use new node's memory, more consideration will be necessary.
147 #define generic_alloc_nodedata(nid) \
149 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
152 * This definition is just for error path in node hotadd.
153 * For node hotremove, we have to replace this.
155 #define generic_free_nodedata(pgdat) kfree(pgdat)
157 extern pg_data_t
*node_data
[];
158 static inline void arch_refresh_nodedata(int nid
, pg_data_t
*pgdat
)
160 node_data
[nid
] = pgdat
;
163 #else /* !CONFIG_NUMA */
166 static inline pg_data_t
*generic_alloc_nodedata(int nid
)
171 static inline void generic_free_nodedata(pg_data_t
*pgdat
)
174 static inline void arch_refresh_nodedata(int nid
, pg_data_t
*pgdat
)
177 #endif /* CONFIG_NUMA */
178 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
180 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
181 extern void register_page_bootmem_info_node(struct pglist_data
*pgdat
);
183 static inline void register_page_bootmem_info_node(struct pglist_data
*pgdat
)
187 extern void put_page_bootmem(struct page
*page
);
188 extern void get_page_bootmem(unsigned long ingo
, struct page
*page
,
191 void get_online_mems(void);
192 void put_online_mems(void);
194 #else /* ! CONFIG_MEMORY_HOTPLUG */
196 * Stub functions for when hotplug is off
198 static inline void pgdat_resize_lock(struct pglist_data
*p
, unsigned long *f
) {}
199 static inline void pgdat_resize_unlock(struct pglist_data
*p
, unsigned long *f
) {}
200 static inline void pgdat_resize_init(struct pglist_data
*pgdat
) {}
202 static inline unsigned zone_span_seqbegin(struct zone
*zone
)
206 static inline int zone_span_seqretry(struct zone
*zone
, unsigned iv
)
210 static inline void zone_span_writelock(struct zone
*zone
) {}
211 static inline void zone_span_writeunlock(struct zone
*zone
) {}
212 static inline void zone_seqlock_init(struct zone
*zone
) {}
214 static inline int mhp_notimplemented(const char *func
)
216 printk(KERN_WARNING
"%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func
);
221 static inline void register_page_bootmem_info_node(struct pglist_data
*pgdat
)
225 static inline int try_online_node(int nid
)
230 static inline void get_online_mems(void) {}
231 static inline void put_online_mems(void) {}
233 #endif /* ! CONFIG_MEMORY_HOTPLUG */
235 #ifdef CONFIG_MEMORY_HOTREMOVE
237 extern int is_mem_section_removable(unsigned long pfn
, unsigned long nr_pages
);
238 extern void try_offline_node(int nid
);
239 extern int offline_pages(unsigned long start_pfn
, unsigned long nr_pages
);
240 extern void remove_memory(int nid
, u64 start
, u64 size
);
243 static inline int is_mem_section_removable(unsigned long pfn
,
244 unsigned long nr_pages
)
249 static inline void try_offline_node(int nid
) {}
251 static inline int offline_pages(unsigned long start_pfn
, unsigned long nr_pages
)
256 static inline void remove_memory(int nid
, u64 start
, u64 size
) {}
257 #endif /* CONFIG_MEMORY_HOTREMOVE */
259 extern int walk_memory_range(unsigned long start_pfn
, unsigned long end_pfn
,
260 void *arg
, int (*func
)(struct memory_block
*, void *));
261 extern int add_memory(int nid
, u64 start
, u64 size
);
262 extern int zone_for_memory(int nid
, u64 start
, u64 size
, int zone_default
);
263 extern int arch_add_memory(int nid
, u64 start
, u64 size
);
264 extern int offline_pages(unsigned long start_pfn
, unsigned long nr_pages
);
265 extern bool is_memblock_offlined(struct memory_block
*mem
);
266 extern void remove_memory(int nid
, u64 start
, u64 size
);
267 extern int sparse_add_one_section(struct zone
*zone
, unsigned long start_pfn
);
268 extern void sparse_remove_one_section(struct zone
*zone
, struct mem_section
*ms
);
269 extern struct page
*sparse_decode_mem_map(unsigned long coded_mem_map
,
272 #endif /* __LINUX_MEMORY_HOTPLUG_H */