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 int test_pages_in_a_zone(unsigned long, unsigned long);
88 extern void __offline_isolated_pages(unsigned long, unsigned long);
90 typedef void (*online_page_callback_t
)(struct page
*page
);
92 extern int set_online_page_callback(online_page_callback_t callback
);
93 extern int restore_online_page_callback(online_page_callback_t callback
);
95 extern void __online_page_set_limits(struct page
*page
);
96 extern void __online_page_increment_counters(struct page
*page
);
97 extern void __online_page_free(struct page
*page
);
99 extern int try_online_node(int nid
);
101 #ifdef CONFIG_MEMORY_HOTREMOVE
102 extern bool is_pageblock_removable_nolock(struct page
*page
);
103 extern int arch_remove_memory(u64 start
, u64 size
);
104 extern int __remove_pages(struct zone
*zone
, unsigned long start_pfn
,
105 unsigned long nr_pages
);
106 #endif /* CONFIG_MEMORY_HOTREMOVE */
108 /* reasonably generic interface to expand the physical pages in a zone */
109 extern int __add_pages(int nid
, struct zone
*zone
, unsigned long start_pfn
,
110 unsigned long nr_pages
);
113 extern int memory_add_physaddr_to_nid(u64 start
);
115 static inline int memory_add_physaddr_to_nid(u64 start
)
121 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
123 * For supporting node-hotadd, we have to allocate a new pgdat.
125 * If an arch has generic style NODE_DATA(),
126 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
128 * In general, generic_alloc_nodedata() is used.
129 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
132 extern pg_data_t
*arch_alloc_nodedata(int nid
);
133 extern void arch_free_nodedata(pg_data_t
*pgdat
);
134 extern void arch_refresh_nodedata(int nid
, pg_data_t
*pgdat
);
136 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
138 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
139 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
143 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
144 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
145 * Because, pgdat for the new node is not allocated/initialized yet itself.
146 * To use new node's memory, more consideration will be necessary.
148 #define generic_alloc_nodedata(nid) \
150 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
153 * This definition is just for error path in node hotadd.
154 * For node hotremove, we have to replace this.
156 #define generic_free_nodedata(pgdat) kfree(pgdat)
158 extern pg_data_t
*node_data
[];
159 static inline void arch_refresh_nodedata(int nid
, pg_data_t
*pgdat
)
161 node_data
[nid
] = pgdat
;
164 #else /* !CONFIG_NUMA */
167 static inline pg_data_t
*generic_alloc_nodedata(int nid
)
172 static inline void generic_free_nodedata(pg_data_t
*pgdat
)
175 static inline void arch_refresh_nodedata(int nid
, pg_data_t
*pgdat
)
178 #endif /* CONFIG_NUMA */
179 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
181 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
182 extern void register_page_bootmem_info_node(struct pglist_data
*pgdat
);
184 static inline void register_page_bootmem_info_node(struct pglist_data
*pgdat
)
188 extern void put_page_bootmem(struct page
*page
);
189 extern void get_page_bootmem(unsigned long ingo
, struct page
*page
,
192 void get_online_mems(void);
193 void put_online_mems(void);
195 #else /* ! CONFIG_MEMORY_HOTPLUG */
197 * Stub functions for when hotplug is off
199 static inline void pgdat_resize_lock(struct pglist_data
*p
, unsigned long *f
) {}
200 static inline void pgdat_resize_unlock(struct pglist_data
*p
, unsigned long *f
) {}
201 static inline void pgdat_resize_init(struct pglist_data
*pgdat
) {}
203 static inline unsigned zone_span_seqbegin(struct zone
*zone
)
207 static inline int zone_span_seqretry(struct zone
*zone
, unsigned iv
)
211 static inline void zone_span_writelock(struct zone
*zone
) {}
212 static inline void zone_span_writeunlock(struct zone
*zone
) {}
213 static inline void zone_seqlock_init(struct zone
*zone
) {}
215 static inline int mhp_notimplemented(const char *func
)
217 printk(KERN_WARNING
"%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func
);
222 static inline void register_page_bootmem_info_node(struct pglist_data
*pgdat
)
226 static inline int try_online_node(int nid
)
231 static inline void get_online_mems(void) {}
232 static inline void put_online_mems(void) {}
234 #endif /* ! CONFIG_MEMORY_HOTPLUG */
236 #ifdef CONFIG_MEMORY_HOTREMOVE
238 extern int is_mem_section_removable(unsigned long pfn
, unsigned long nr_pages
);
239 extern void try_offline_node(int nid
);
240 extern int offline_pages(unsigned long start_pfn
, unsigned long nr_pages
);
241 extern void remove_memory(int nid
, u64 start
, u64 size
);
244 static inline int is_mem_section_removable(unsigned long pfn
,
245 unsigned long nr_pages
)
250 static inline void try_offline_node(int nid
) {}
252 static inline int offline_pages(unsigned long start_pfn
, unsigned long nr_pages
)
257 static inline void remove_memory(int nid
, u64 start
, u64 size
) {}
258 #endif /* CONFIG_MEMORY_HOTREMOVE */
260 extern int walk_memory_range(unsigned long start_pfn
, unsigned long end_pfn
,
261 void *arg
, int (*func
)(struct memory_block
*, void *));
262 extern int add_memory(int nid
, u64 start
, u64 size
);
263 extern int zone_for_memory(int nid
, u64 start
, u64 size
, int zone_default
);
264 extern int arch_add_memory(int nid
, u64 start
, u64 size
);
265 extern int offline_pages(unsigned long start_pfn
, unsigned long nr_pages
);
266 extern bool is_memblock_offlined(struct memory_block
*mem
);
267 extern void remove_memory(int nid
, u64 start
, u64 size
);
268 extern int sparse_add_one_section(struct zone
*zone
, unsigned long start_pfn
);
269 extern void sparse_remove_one_section(struct zone
*zone
, struct mem_section
*ms
);
270 extern struct page
*sparse_decode_mem_map(unsigned long coded_mem_map
,
273 #endif /* __LINUX_MEMORY_HOTPLUG_H */