1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __LINUX_MEMORY_HOTPLUG_H
3 #define __LINUX_MEMORY_HOTPLUG_H
5 #include <linux/mmzone.h>
6 #include <linux/spinlock.h>
7 #include <linux/notifier.h>
17 #ifdef CONFIG_MEMORY_HOTPLUG
19 * Return page for the valid pfn only if the page is online. All pfn
20 * walkers which rely on the fully initialized page->flags and others
21 * should use this rather than pfn_valid && pfn_to_page
23 #define pfn_to_online_page(pfn) \
25 struct page *___page = NULL; \
26 unsigned long ___nr = pfn_to_section_nr(pfn); \
28 if (___nr < NR_MEM_SECTIONS && online_section_nr(___nr))\
29 ___page = pfn_to_page(pfn); \
34 * Types for free bootmem stored in page->lru.next. These have to be in
35 * some random range in unsigned long space for debugging purposes.
38 MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE
= 12,
39 SECTION_INFO
= MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE
,
42 MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE
= NODE_INFO
,
45 /* Types for control the zone type of onlined and offlined memory */
54 * pgdat resizing functions
57 void pgdat_resize_lock(struct pglist_data
*pgdat
, unsigned long *flags
)
59 spin_lock_irqsave(&pgdat
->node_size_lock
, *flags
);
62 void pgdat_resize_unlock(struct pglist_data
*pgdat
, unsigned long *flags
)
64 spin_unlock_irqrestore(&pgdat
->node_size_lock
, *flags
);
67 void pgdat_resize_init(struct pglist_data
*pgdat
)
69 spin_lock_init(&pgdat
->node_size_lock
);
72 * Zone resizing functions
74 * Note: any attempt to resize a zone should has pgdat_resize_lock()
75 * zone_span_writelock() both held. This ensure the size of a zone
76 * can't be changed while pgdat_resize_lock() held.
78 static inline unsigned zone_span_seqbegin(struct zone
*zone
)
80 return read_seqbegin(&zone
->span_seqlock
);
82 static inline int zone_span_seqretry(struct zone
*zone
, unsigned iv
)
84 return read_seqretry(&zone
->span_seqlock
, iv
);
86 static inline void zone_span_writelock(struct zone
*zone
)
88 write_seqlock(&zone
->span_seqlock
);
90 static inline void zone_span_writeunlock(struct zone
*zone
)
92 write_sequnlock(&zone
->span_seqlock
);
94 static inline void zone_seqlock_init(struct zone
*zone
)
96 seqlock_init(&zone
->span_seqlock
);
98 extern int zone_grow_free_lists(struct zone
*zone
, unsigned long new_nr_pages
);
99 extern int zone_grow_waitqueues(struct zone
*zone
, unsigned long nr_pages
);
100 extern int add_one_highpage(struct page
*page
, int pfn
, int bad_ppro
);
101 /* VM interface that may be used by firmware interface */
102 extern int online_pages(unsigned long, unsigned long, int);
103 extern int test_pages_in_a_zone(unsigned long start_pfn
, unsigned long end_pfn
,
104 unsigned long *valid_start
, unsigned long *valid_end
);
105 extern void __offline_isolated_pages(unsigned long, unsigned long);
107 typedef void (*online_page_callback_t
)(struct page
*page
);
109 extern int set_online_page_callback(online_page_callback_t callback
);
110 extern int restore_online_page_callback(online_page_callback_t callback
);
112 extern void __online_page_set_limits(struct page
*page
);
113 extern void __online_page_increment_counters(struct page
*page
);
114 extern void __online_page_free(struct page
*page
);
116 extern int try_online_node(int nid
);
118 extern bool memhp_auto_online
;
119 /* If movable_node boot option specified */
120 extern bool movable_node_enabled
;
121 static inline bool movable_node_is_enabled(void)
123 return movable_node_enabled
;
126 #ifdef CONFIG_MEMORY_HOTREMOVE
127 extern bool is_pageblock_removable_nolock(struct page
*page
);
128 extern int arch_remove_memory(u64 start
, u64 size
);
129 extern int __remove_pages(struct zone
*zone
, unsigned long start_pfn
,
130 unsigned long nr_pages
);
131 #endif /* CONFIG_MEMORY_HOTREMOVE */
133 /* reasonably generic interface to expand the physical pages */
134 extern int __add_pages(int nid
, unsigned long start_pfn
,
135 unsigned long nr_pages
, bool want_memblock
);
137 #ifndef CONFIG_ARCH_HAS_ADD_PAGES
138 static inline int add_pages(int nid
, unsigned long start_pfn
,
139 unsigned long nr_pages
, bool want_memblock
)
141 return __add_pages(nid
, start_pfn
, nr_pages
, want_memblock
);
143 #else /* ARCH_HAS_ADD_PAGES */
144 int add_pages(int nid
, unsigned long start_pfn
,
145 unsigned long nr_pages
, bool want_memblock
);
146 #endif /* ARCH_HAS_ADD_PAGES */
149 extern int memory_add_physaddr_to_nid(u64 start
);
151 static inline int memory_add_physaddr_to_nid(u64 start
)
157 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
159 * For supporting node-hotadd, we have to allocate a new pgdat.
161 * If an arch has generic style NODE_DATA(),
162 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
164 * In general, generic_alloc_nodedata() is used.
165 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
168 extern pg_data_t
*arch_alloc_nodedata(int nid
);
169 extern void arch_free_nodedata(pg_data_t
*pgdat
);
170 extern void arch_refresh_nodedata(int nid
, pg_data_t
*pgdat
);
172 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
174 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
175 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
179 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
180 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
181 * Because, pgdat for the new node is not allocated/initialized yet itself.
182 * To use new node's memory, more consideration will be necessary.
184 #define generic_alloc_nodedata(nid) \
186 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
189 * This definition is just for error path in node hotadd.
190 * For node hotremove, we have to replace this.
192 #define generic_free_nodedata(pgdat) kfree(pgdat)
194 extern pg_data_t
*node_data
[];
195 static inline void arch_refresh_nodedata(int nid
, pg_data_t
*pgdat
)
197 node_data
[nid
] = pgdat
;
200 #else /* !CONFIG_NUMA */
203 static inline pg_data_t
*generic_alloc_nodedata(int nid
)
208 static inline void generic_free_nodedata(pg_data_t
*pgdat
)
211 static inline void arch_refresh_nodedata(int nid
, pg_data_t
*pgdat
)
214 #endif /* CONFIG_NUMA */
215 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
217 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
218 extern void __init
register_page_bootmem_info_node(struct pglist_data
*pgdat
);
220 static inline void register_page_bootmem_info_node(struct pglist_data
*pgdat
)
224 extern void put_page_bootmem(struct page
*page
);
225 extern void get_page_bootmem(unsigned long ingo
, struct page
*page
,
228 void get_online_mems(void);
229 void put_online_mems(void);
231 void mem_hotplug_begin(void);
232 void mem_hotplug_done(void);
234 void set_default_mem_hotplug_zone(enum zone_type zone
);
236 extern void set_zone_contiguous(struct zone
*zone
);
237 extern void clear_zone_contiguous(struct zone
*zone
);
239 #else /* ! CONFIG_MEMORY_HOTPLUG */
240 #define pfn_to_online_page(pfn) \
242 struct page *___page = NULL; \
243 if (pfn_valid(pfn)) \
244 ___page = pfn_to_page(pfn); \
249 * Stub functions for when hotplug is off
251 static inline void pgdat_resize_lock(struct pglist_data
*p
, unsigned long *f
) {}
252 static inline void pgdat_resize_unlock(struct pglist_data
*p
, unsigned long *f
) {}
253 static inline void pgdat_resize_init(struct pglist_data
*pgdat
) {}
255 static inline unsigned zone_span_seqbegin(struct zone
*zone
)
259 static inline int zone_span_seqretry(struct zone
*zone
, unsigned iv
)
263 static inline void zone_span_writelock(struct zone
*zone
) {}
264 static inline void zone_span_writeunlock(struct zone
*zone
) {}
265 static inline void zone_seqlock_init(struct zone
*zone
) {}
267 static inline int mhp_notimplemented(const char *func
)
269 printk(KERN_WARNING
"%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func
);
274 static inline void register_page_bootmem_info_node(struct pglist_data
*pgdat
)
278 static inline int try_online_node(int nid
)
283 static inline void get_online_mems(void) {}
284 static inline void put_online_mems(void) {}
286 static inline void mem_hotplug_begin(void) {}
287 static inline void mem_hotplug_done(void) {}
289 static inline void set_default_mem_hotplug_zone(enum zone_type zone
) {}
291 static inline bool movable_node_is_enabled(void)
295 #endif /* ! CONFIG_MEMORY_HOTPLUG */
297 #ifdef CONFIG_MEMORY_HOTREMOVE
299 extern bool is_mem_section_removable(unsigned long pfn
, unsigned long nr_pages
);
300 extern void try_offline_node(int nid
);
301 extern int offline_pages(unsigned long start_pfn
, unsigned long nr_pages
);
302 extern void remove_memory(int nid
, u64 start
, u64 size
);
305 static inline bool is_mem_section_removable(unsigned long pfn
,
306 unsigned long nr_pages
)
311 static inline void try_offline_node(int nid
) {}
313 static inline int offline_pages(unsigned long start_pfn
, unsigned long nr_pages
)
318 static inline void remove_memory(int nid
, u64 start
, u64 size
) {}
319 #endif /* CONFIG_MEMORY_HOTREMOVE */
321 extern int walk_memory_range(unsigned long start_pfn
, unsigned long end_pfn
,
322 void *arg
, int (*func
)(struct memory_block
*, void *));
323 extern int add_memory(int nid
, u64 start
, u64 size
);
324 extern int add_memory_resource(int nid
, struct resource
*resource
, bool online
);
325 extern int arch_add_memory(int nid
, u64 start
, u64 size
, bool want_memblock
);
326 extern void move_pfn_range_to_zone(struct zone
*zone
, unsigned long start_pfn
,
327 unsigned long nr_pages
);
328 extern int offline_pages(unsigned long start_pfn
, unsigned long nr_pages
);
329 extern bool is_memblock_offlined(struct memory_block
*mem
);
330 extern void remove_memory(int nid
, u64 start
, u64 size
);
331 extern int sparse_add_one_section(struct pglist_data
*pgdat
, unsigned long start_pfn
);
332 extern void sparse_remove_one_section(struct zone
*zone
, struct mem_section
*ms
,
333 unsigned long map_offset
);
334 extern struct page
*sparse_decode_mem_map(unsigned long coded_mem_map
,
336 extern bool allow_online_pfn_range(int nid
, unsigned long pfn
, unsigned long nr_pages
,
338 extern struct zone
*zone_for_pfn_range(int online_type
, int nid
, unsigned start_pfn
,
339 unsigned long nr_pages
);
340 #endif /* __LINUX_MEMORY_HOTPLUG_H */