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>
14 #ifdef CONFIG_MEMORY_HOTPLUG
17 * Types for free bootmem stored in page->lru.next. These have to be in
18 * some random range in unsigned long space for debugging purposes.
21 MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE
= 12,
22 SECTION_INFO
= MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE
,
25 MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE
= NODE_INFO
,
29 * pgdat resizing functions
32 void pgdat_resize_lock(struct pglist_data
*pgdat
, unsigned long *flags
)
34 spin_lock_irqsave(&pgdat
->node_size_lock
, *flags
);
37 void pgdat_resize_unlock(struct pglist_data
*pgdat
, unsigned long *flags
)
39 spin_unlock_irqrestore(&pgdat
->node_size_lock
, *flags
);
42 void pgdat_resize_init(struct pglist_data
*pgdat
)
44 spin_lock_init(&pgdat
->node_size_lock
);
47 * Zone resizing functions
49 static inline unsigned zone_span_seqbegin(struct zone
*zone
)
51 return read_seqbegin(&zone
->span_seqlock
);
53 static inline int zone_span_seqretry(struct zone
*zone
, unsigned iv
)
55 return read_seqretry(&zone
->span_seqlock
, iv
);
57 static inline void zone_span_writelock(struct zone
*zone
)
59 write_seqlock(&zone
->span_seqlock
);
61 static inline void zone_span_writeunlock(struct zone
*zone
)
63 write_sequnlock(&zone
->span_seqlock
);
65 static inline void zone_seqlock_init(struct zone
*zone
)
67 seqlock_init(&zone
->span_seqlock
);
69 extern int zone_grow_free_lists(struct zone
*zone
, unsigned long new_nr_pages
);
70 extern int zone_grow_waitqueues(struct zone
*zone
, unsigned long nr_pages
);
71 extern int add_one_highpage(struct page
*page
, int pfn
, int bad_ppro
);
72 /* VM interface that may be used by firmware interface */
73 extern int online_pages(unsigned long, unsigned long);
74 extern void __offline_isolated_pages(unsigned long, unsigned long);
76 typedef void (*online_page_callback_t
)(struct page
*page
);
78 extern int set_online_page_callback(online_page_callback_t callback
);
79 extern int restore_online_page_callback(online_page_callback_t callback
);
81 extern void __online_page_set_limits(struct page
*page
);
82 extern void __online_page_increment_counters(struct page
*page
);
83 extern void __online_page_free(struct page
*page
);
85 #ifdef CONFIG_MEMORY_HOTREMOVE
86 extern bool is_pageblock_removable_nolock(struct page
*page
);
87 #endif /* CONFIG_MEMORY_HOTREMOVE */
89 /* reasonably generic interface to expand the physical pages in a zone */
90 extern int __add_pages(int nid
, struct zone
*zone
, unsigned long start_pfn
,
91 unsigned long nr_pages
);
92 extern int __remove_pages(struct zone
*zone
, unsigned long start_pfn
,
93 unsigned long nr_pages
);
96 extern int memory_add_physaddr_to_nid(u64 start
);
98 static inline int memory_add_physaddr_to_nid(u64 start
)
104 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
106 * For supporting node-hotadd, we have to allocate a new pgdat.
108 * If an arch has generic style NODE_DATA(),
109 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
111 * In general, generic_alloc_nodedata() is used.
112 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
115 extern pg_data_t
*arch_alloc_nodedata(int nid
);
116 extern void arch_free_nodedata(pg_data_t
*pgdat
);
117 extern void arch_refresh_nodedata(int nid
, pg_data_t
*pgdat
);
119 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
121 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
122 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
126 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
127 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
128 * Because, pgdat for the new node is not allocated/initialized yet itself.
129 * To use new node's memory, more consideration will be necessary.
131 #define generic_alloc_nodedata(nid) \
133 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
136 * This definition is just for error path in node hotadd.
137 * For node hotremove, we have to replace this.
139 #define generic_free_nodedata(pgdat) kfree(pgdat)
141 extern pg_data_t
*node_data
[];
142 static inline void arch_refresh_nodedata(int nid
, pg_data_t
*pgdat
)
144 node_data
[nid
] = pgdat
;
147 #else /* !CONFIG_NUMA */
150 static inline pg_data_t
*generic_alloc_nodedata(int nid
)
155 static inline void generic_free_nodedata(pg_data_t
*pgdat
)
158 static inline void arch_refresh_nodedata(int nid
, pg_data_t
*pgdat
)
161 #endif /* CONFIG_NUMA */
162 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
164 #ifdef CONFIG_SPARSEMEM_VMEMMAP
165 static inline void register_page_bootmem_info_node(struct pglist_data
*pgdat
)
168 static inline void put_page_bootmem(struct page
*page
)
172 extern void register_page_bootmem_info_node(struct pglist_data
*pgdat
);
173 extern void put_page_bootmem(struct page
*page
);
177 * Lock for memory hotplug guarantees 1) all callbacks for memory hotplug
178 * notifier will be called under this. 2) offline/online/add/remove memory
179 * will not run simultaneously.
182 void lock_memory_hotplug(void);
183 void unlock_memory_hotplug(void);
185 #else /* ! CONFIG_MEMORY_HOTPLUG */
187 * Stub functions for when hotplug is off
189 static inline void pgdat_resize_lock(struct pglist_data
*p
, unsigned long *f
) {}
190 static inline void pgdat_resize_unlock(struct pglist_data
*p
, unsigned long *f
) {}
191 static inline void pgdat_resize_init(struct pglist_data
*pgdat
) {}
193 static inline unsigned zone_span_seqbegin(struct zone
*zone
)
197 static inline int zone_span_seqretry(struct zone
*zone
, unsigned iv
)
201 static inline void zone_span_writelock(struct zone
*zone
) {}
202 static inline void zone_span_writeunlock(struct zone
*zone
) {}
203 static inline void zone_seqlock_init(struct zone
*zone
) {}
205 static inline int mhp_notimplemented(const char *func
)
207 printk(KERN_WARNING
"%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func
);
212 static inline void register_page_bootmem_info_node(struct pglist_data
*pgdat
)
216 static inline void lock_memory_hotplug(void) {}
217 static inline void unlock_memory_hotplug(void) {}
219 #endif /* ! CONFIG_MEMORY_HOTPLUG */
221 #ifdef CONFIG_MEMORY_HOTREMOVE
223 extern int is_mem_section_removable(unsigned long pfn
, unsigned long nr_pages
);
226 static inline int is_mem_section_removable(unsigned long pfn
,
227 unsigned long nr_pages
)
231 #endif /* CONFIG_MEMORY_HOTREMOVE */
233 extern int mem_online_node(int nid
);
234 extern int add_memory(int nid
, u64 start
, u64 size
);
235 extern int arch_add_memory(int nid
, u64 start
, u64 size
);
236 extern int remove_memory(u64 start
, u64 size
);
237 extern int sparse_add_one_section(struct zone
*zone
, unsigned long start_pfn
,
239 extern void sparse_remove_one_section(struct zone
*zone
, struct mem_section
*ms
);
240 extern struct page
*sparse_decode_mem_map(unsigned long coded_mem_map
,
243 #endif /* __LINUX_MEMORY_HOTPLUG_H */