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 extern int try_online_node(int nid
);
99 #ifdef CONFIG_MEMORY_HOTREMOVE
100 extern bool is_pageblock_removable_nolock(struct page
*page
);
101 extern int arch_remove_memory(u64 start
, u64 size
);
102 extern int __remove_pages(struct zone
*zone
, unsigned long start_pfn
,
103 unsigned long nr_pages
);
104 #endif /* CONFIG_MEMORY_HOTREMOVE */
106 /* reasonably generic interface to expand the physical pages in a zone */
107 extern int __add_pages(int nid
, struct zone
*zone
, unsigned long start_pfn
,
108 unsigned long nr_pages
);
111 extern int memory_add_physaddr_to_nid(u64 start
);
113 static inline int memory_add_physaddr_to_nid(u64 start
)
119 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
121 * For supporting node-hotadd, we have to allocate a new pgdat.
123 * If an arch has generic style NODE_DATA(),
124 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
126 * In general, generic_alloc_nodedata() is used.
127 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
130 extern pg_data_t
*arch_alloc_nodedata(int nid
);
131 extern void arch_free_nodedata(pg_data_t
*pgdat
);
132 extern void arch_refresh_nodedata(int nid
, pg_data_t
*pgdat
);
134 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
136 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
137 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
141 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
142 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
143 * Because, pgdat for the new node is not allocated/initialized yet itself.
144 * To use new node's memory, more consideration will be necessary.
146 #define generic_alloc_nodedata(nid) \
148 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
151 * This definition is just for error path in node hotadd.
152 * For node hotremove, we have to replace this.
154 #define generic_free_nodedata(pgdat) kfree(pgdat)
156 extern pg_data_t
*node_data
[];
157 static inline void arch_refresh_nodedata(int nid
, pg_data_t
*pgdat
)
159 node_data
[nid
] = pgdat
;
162 #else /* !CONFIG_NUMA */
165 static inline pg_data_t
*generic_alloc_nodedata(int nid
)
170 static inline void generic_free_nodedata(pg_data_t
*pgdat
)
173 static inline void arch_refresh_nodedata(int nid
, pg_data_t
*pgdat
)
176 #endif /* CONFIG_NUMA */
177 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
179 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
180 extern void register_page_bootmem_info_node(struct pglist_data
*pgdat
);
182 static inline void register_page_bootmem_info_node(struct pglist_data
*pgdat
)
186 extern void put_page_bootmem(struct page
*page
);
187 extern void get_page_bootmem(unsigned long ingo
, struct page
*page
,
190 void get_online_mems(void);
191 void put_online_mems(void);
193 #else /* ! CONFIG_MEMORY_HOTPLUG */
195 * Stub functions for when hotplug is off
197 static inline void pgdat_resize_lock(struct pglist_data
*p
, unsigned long *f
) {}
198 static inline void pgdat_resize_unlock(struct pglist_data
*p
, unsigned long *f
) {}
199 static inline void pgdat_resize_init(struct pglist_data
*pgdat
) {}
201 static inline unsigned zone_span_seqbegin(struct zone
*zone
)
205 static inline int zone_span_seqretry(struct zone
*zone
, unsigned iv
)
209 static inline void zone_span_writelock(struct zone
*zone
) {}
210 static inline void zone_span_writeunlock(struct zone
*zone
) {}
211 static inline void zone_seqlock_init(struct zone
*zone
) {}
213 static inline int mhp_notimplemented(const char *func
)
215 printk(KERN_WARNING
"%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func
);
220 static inline void register_page_bootmem_info_node(struct pglist_data
*pgdat
)
224 static inline int try_online_node(int nid
)
229 static inline void get_online_mems(void) {}
230 static inline void put_online_mems(void) {}
232 #endif /* ! CONFIG_MEMORY_HOTPLUG */
234 #ifdef CONFIG_MEMORY_HOTREMOVE
236 extern int is_mem_section_removable(unsigned long pfn
, unsigned long nr_pages
);
237 extern void try_offline_node(int nid
);
238 extern int offline_pages(unsigned long start_pfn
, unsigned long nr_pages
);
239 extern void remove_memory(int nid
, u64 start
, u64 size
);
242 static inline int is_mem_section_removable(unsigned long pfn
,
243 unsigned long nr_pages
)
248 static inline void try_offline_node(int nid
) {}
250 static inline int offline_pages(unsigned long start_pfn
, unsigned long nr_pages
)
255 static inline void remove_memory(int nid
, u64 start
, u64 size
) {}
256 #endif /* CONFIG_MEMORY_HOTREMOVE */
258 extern int walk_memory_range(unsigned long start_pfn
, unsigned long end_pfn
,
259 void *arg
, int (*func
)(struct memory_block
*, void *));
260 extern int add_memory(int nid
, u64 start
, u64 size
);
261 extern int arch_add_memory(int nid
, u64 start
, u64 size
);
262 extern int offline_pages(unsigned long start_pfn
, unsigned long nr_pages
);
263 extern bool is_memblock_offlined(struct memory_block
*mem
);
264 extern void remove_memory(int nid
, u64 start
, u64 size
);
265 extern int sparse_add_one_section(struct zone
*zone
, unsigned long start_pfn
);
266 extern void sparse_remove_one_section(struct zone
*zone
, struct mem_section
*ms
);
267 extern struct page
*sparse_decode_mem_map(unsigned long coded_mem_map
,
270 #endif /* __LINUX_MEMORY_HOTPLUG_H */