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 #ifdef CONFIG_MEMORY_HOTREMOVE
98 extern bool is_pageblock_removable_nolock(struct page
*page
);
99 extern int arch_remove_memory(u64 start
, u64 size
);
100 #endif /* CONFIG_MEMORY_HOTREMOVE */
102 /* reasonably generic interface to expand the physical pages in a zone */
103 extern int __add_pages(int nid
, struct zone
*zone
, unsigned long start_pfn
,
104 unsigned long nr_pages
);
105 extern int __remove_pages(struct zone
*zone
, unsigned long start_pfn
,
106 unsigned long nr_pages
);
109 extern int memory_add_physaddr_to_nid(u64 start
);
111 static inline int memory_add_physaddr_to_nid(u64 start
)
117 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
119 * For supporting node-hotadd, we have to allocate a new pgdat.
121 * If an arch has generic style NODE_DATA(),
122 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
124 * In general, generic_alloc_nodedata() is used.
125 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
128 extern pg_data_t
*arch_alloc_nodedata(int nid
);
129 extern void arch_free_nodedata(pg_data_t
*pgdat
);
130 extern void arch_refresh_nodedata(int nid
, pg_data_t
*pgdat
);
132 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
134 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
135 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
139 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
140 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
141 * Because, pgdat for the new node is not allocated/initialized yet itself.
142 * To use new node's memory, more consideration will be necessary.
144 #define generic_alloc_nodedata(nid) \
146 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
149 * This definition is just for error path in node hotadd.
150 * For node hotremove, we have to replace this.
152 #define generic_free_nodedata(pgdat) kfree(pgdat)
154 extern pg_data_t
*node_data
[];
155 static inline void arch_refresh_nodedata(int nid
, pg_data_t
*pgdat
)
157 node_data
[nid
] = pgdat
;
160 #else /* !CONFIG_NUMA */
163 static inline pg_data_t
*generic_alloc_nodedata(int nid
)
168 static inline void generic_free_nodedata(pg_data_t
*pgdat
)
171 static inline void arch_refresh_nodedata(int nid
, pg_data_t
*pgdat
)
174 #endif /* CONFIG_NUMA */
175 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
177 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
178 extern void register_page_bootmem_info_node(struct pglist_data
*pgdat
);
180 static inline void register_page_bootmem_info_node(struct pglist_data
*pgdat
)
184 extern void put_page_bootmem(struct page
*page
);
185 extern void get_page_bootmem(unsigned long ingo
, struct page
*page
,
189 * Lock for memory hotplug guarantees 1) all callbacks for memory hotplug
190 * notifier will be called under this. 2) offline/online/add/remove memory
191 * will not run simultaneously.
194 void lock_memory_hotplug(void);
195 void unlock_memory_hotplug(void);
197 #else /* ! CONFIG_MEMORY_HOTPLUG */
199 * Stub functions for when hotplug is off
201 static inline void pgdat_resize_lock(struct pglist_data
*p
, unsigned long *f
) {}
202 static inline void pgdat_resize_unlock(struct pglist_data
*p
, unsigned long *f
) {}
203 static inline void pgdat_resize_init(struct pglist_data
*pgdat
) {}
205 static inline unsigned zone_span_seqbegin(struct zone
*zone
)
209 static inline int zone_span_seqretry(struct zone
*zone
, unsigned iv
)
213 static inline void zone_span_writelock(struct zone
*zone
) {}
214 static inline void zone_span_writeunlock(struct zone
*zone
) {}
215 static inline void zone_seqlock_init(struct zone
*zone
) {}
217 static inline int mhp_notimplemented(const char *func
)
219 printk(KERN_WARNING
"%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func
);
224 static inline void register_page_bootmem_info_node(struct pglist_data
*pgdat
)
228 static inline void lock_memory_hotplug(void) {}
229 static inline void unlock_memory_hotplug(void) {}
231 #endif /* ! CONFIG_MEMORY_HOTPLUG */
233 #ifdef CONFIG_MEMORY_HOTREMOVE
235 extern int is_mem_section_removable(unsigned long pfn
, unsigned long nr_pages
);
236 extern void try_offline_node(int nid
);
239 static inline int is_mem_section_removable(unsigned long pfn
,
240 unsigned long nr_pages
)
245 static inline void try_offline_node(int nid
) {}
246 #endif /* CONFIG_MEMORY_HOTREMOVE */
248 extern int mem_online_node(int nid
);
249 extern int add_memory(int nid
, u64 start
, u64 size
);
250 extern int arch_add_memory(int nid
, u64 start
, u64 size
);
251 extern int offline_pages(unsigned long start_pfn
, unsigned long nr_pages
);
252 extern int offline_memory_block(struct memory_block
*mem
);
253 extern bool is_memblock_offlined(struct memory_block
*mem
);
254 extern int remove_memory(int nid
, u64 start
, u64 size
);
255 extern int sparse_add_one_section(struct zone
*zone
, unsigned long start_pfn
,
257 extern void sparse_remove_one_section(struct zone
*zone
, struct mem_section
*ms
);
258 extern struct page
*sparse_decode_mem_map(unsigned long coded_mem_map
,
261 #endif /* __LINUX_MEMORY_HOTPLUG_H */