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 ___pfn = pfn; \
27 unsigned long ___nr = pfn_to_section_nr(___pfn); \
29 if (___nr < NR_MEM_SECTIONS && online_section_nr(___nr) && \
30 pfn_valid_within(___pfn)) \
31 ___page = pfn_to_page(___pfn); \
36 * Types for free bootmem stored in page->lru.next. These have to be in
37 * some random range in unsigned long space for debugging purposes.
40 MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE
= 12,
41 SECTION_INFO
= MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE
,
44 MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE
= NODE_INFO
,
47 /* Types for control the zone type of onlined and offlined memory */
56 * pgdat resizing functions
59 void pgdat_resize_lock(struct pglist_data
*pgdat
, unsigned long *flags
)
61 spin_lock_irqsave(&pgdat
->node_size_lock
, *flags
);
64 void pgdat_resize_unlock(struct pglist_data
*pgdat
, unsigned long *flags
)
66 spin_unlock_irqrestore(&pgdat
->node_size_lock
, *flags
);
69 void pgdat_resize_init(struct pglist_data
*pgdat
)
71 spin_lock_init(&pgdat
->node_size_lock
);
74 * Zone resizing functions
76 * Note: any attempt to resize a zone should has pgdat_resize_lock()
77 * zone_span_writelock() both held. This ensure the size of a zone
78 * can't be changed while pgdat_resize_lock() held.
80 static inline unsigned zone_span_seqbegin(struct zone
*zone
)
82 return read_seqbegin(&zone
->span_seqlock
);
84 static inline int zone_span_seqretry(struct zone
*zone
, unsigned iv
)
86 return read_seqretry(&zone
->span_seqlock
, iv
);
88 static inline void zone_span_writelock(struct zone
*zone
)
90 write_seqlock(&zone
->span_seqlock
);
92 static inline void zone_span_writeunlock(struct zone
*zone
)
94 write_sequnlock(&zone
->span_seqlock
);
96 static inline void zone_seqlock_init(struct zone
*zone
)
98 seqlock_init(&zone
->span_seqlock
);
100 extern int zone_grow_free_lists(struct zone
*zone
, unsigned long new_nr_pages
);
101 extern int zone_grow_waitqueues(struct zone
*zone
, unsigned long nr_pages
);
102 extern int add_one_highpage(struct page
*page
, int pfn
, int bad_ppro
);
103 /* VM interface that may be used by firmware interface */
104 extern int online_pages(unsigned long, unsigned long, int);
105 extern int test_pages_in_a_zone(unsigned long start_pfn
, unsigned long end_pfn
,
106 unsigned long *valid_start
, unsigned long *valid_end
);
107 extern void __offline_isolated_pages(unsigned long, unsigned long);
109 typedef void (*online_page_callback_t
)(struct page
*page
);
111 extern int set_online_page_callback(online_page_callback_t callback
);
112 extern int restore_online_page_callback(online_page_callback_t callback
);
114 extern void __online_page_set_limits(struct page
*page
);
115 extern void __online_page_increment_counters(struct page
*page
);
116 extern void __online_page_free(struct page
*page
);
118 extern int try_online_node(int nid
);
120 extern bool memhp_auto_online
;
121 /* If movable_node boot option specified */
122 extern bool movable_node_enabled
;
123 static inline bool movable_node_is_enabled(void)
125 return movable_node_enabled
;
128 #ifdef CONFIG_MEMORY_HOTREMOVE
129 extern bool is_pageblock_removable_nolock(struct page
*page
);
130 extern int arch_remove_memory(u64 start
, u64 size
);
131 extern int __remove_pages(struct zone
*zone
, unsigned long start_pfn
,
132 unsigned long nr_pages
);
133 #endif /* CONFIG_MEMORY_HOTREMOVE */
135 /* reasonably generic interface to expand the physical pages */
136 extern int __add_pages(int nid
, unsigned long start_pfn
,
137 unsigned long nr_pages
, bool want_memblock
);
139 #ifndef CONFIG_ARCH_HAS_ADD_PAGES
140 static inline int add_pages(int nid
, unsigned long start_pfn
,
141 unsigned long nr_pages
, bool want_memblock
)
143 return __add_pages(nid
, start_pfn
, nr_pages
, want_memblock
);
145 #else /* ARCH_HAS_ADD_PAGES */
146 int add_pages(int nid
, unsigned long start_pfn
,
147 unsigned long nr_pages
, bool want_memblock
);
148 #endif /* ARCH_HAS_ADD_PAGES */
151 extern int memory_add_physaddr_to_nid(u64 start
);
153 static inline int memory_add_physaddr_to_nid(u64 start
)
159 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
161 * For supporting node-hotadd, we have to allocate a new pgdat.
163 * If an arch has generic style NODE_DATA(),
164 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
166 * In general, generic_alloc_nodedata() is used.
167 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
170 extern pg_data_t
*arch_alloc_nodedata(int nid
);
171 extern void arch_free_nodedata(pg_data_t
*pgdat
);
172 extern void arch_refresh_nodedata(int nid
, pg_data_t
*pgdat
);
174 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
176 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
177 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
181 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
182 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
183 * Because, pgdat for the new node is not allocated/initialized yet itself.
184 * To use new node's memory, more consideration will be necessary.
186 #define generic_alloc_nodedata(nid) \
188 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
191 * This definition is just for error path in node hotadd.
192 * For node hotremove, we have to replace this.
194 #define generic_free_nodedata(pgdat) kfree(pgdat)
196 extern pg_data_t
*node_data
[];
197 static inline void arch_refresh_nodedata(int nid
, pg_data_t
*pgdat
)
199 node_data
[nid
] = pgdat
;
202 #else /* !CONFIG_NUMA */
205 static inline pg_data_t
*generic_alloc_nodedata(int nid
)
210 static inline void generic_free_nodedata(pg_data_t
*pgdat
)
213 static inline void arch_refresh_nodedata(int nid
, pg_data_t
*pgdat
)
216 #endif /* CONFIG_NUMA */
217 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
219 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
220 extern void __init
register_page_bootmem_info_node(struct pglist_data
*pgdat
);
222 static inline void register_page_bootmem_info_node(struct pglist_data
*pgdat
)
226 extern void put_page_bootmem(struct page
*page
);
227 extern void get_page_bootmem(unsigned long ingo
, struct page
*page
,
230 void get_online_mems(void);
231 void put_online_mems(void);
233 void mem_hotplug_begin(void);
234 void mem_hotplug_done(void);
236 void set_default_mem_hotplug_zone(enum zone_type zone
);
238 extern void set_zone_contiguous(struct zone
*zone
);
239 extern void clear_zone_contiguous(struct zone
*zone
);
241 #else /* ! CONFIG_MEMORY_HOTPLUG */
242 #define pfn_to_online_page(pfn) \
244 struct page *___page = NULL; \
245 if (pfn_valid(pfn)) \
246 ___page = pfn_to_page(pfn); \
251 * Stub functions for when hotplug is off
253 static inline void pgdat_resize_lock(struct pglist_data
*p
, unsigned long *f
) {}
254 static inline void pgdat_resize_unlock(struct pglist_data
*p
, unsigned long *f
) {}
255 static inline void pgdat_resize_init(struct pglist_data
*pgdat
) {}
257 static inline unsigned zone_span_seqbegin(struct zone
*zone
)
261 static inline int zone_span_seqretry(struct zone
*zone
, unsigned iv
)
265 static inline void zone_span_writelock(struct zone
*zone
) {}
266 static inline void zone_span_writeunlock(struct zone
*zone
) {}
267 static inline void zone_seqlock_init(struct zone
*zone
) {}
269 static inline int mhp_notimplemented(const char *func
)
271 printk(KERN_WARNING
"%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func
);
276 static inline void register_page_bootmem_info_node(struct pglist_data
*pgdat
)
280 static inline int try_online_node(int nid
)
285 static inline void get_online_mems(void) {}
286 static inline void put_online_mems(void) {}
288 static inline void mem_hotplug_begin(void) {}
289 static inline void mem_hotplug_done(void) {}
291 static inline void set_default_mem_hotplug_zone(enum zone_type zone
) {}
293 static inline bool movable_node_is_enabled(void)
297 #endif /* ! CONFIG_MEMORY_HOTPLUG */
299 #ifdef CONFIG_MEMORY_HOTREMOVE
301 extern bool is_mem_section_removable(unsigned long pfn
, unsigned long nr_pages
);
302 extern void try_offline_node(int nid
);
303 extern int offline_pages(unsigned long start_pfn
, unsigned long nr_pages
);
304 extern void remove_memory(int nid
, u64 start
, u64 size
);
307 static inline bool is_mem_section_removable(unsigned long pfn
,
308 unsigned long nr_pages
)
313 static inline void try_offline_node(int nid
) {}
315 static inline int offline_pages(unsigned long start_pfn
, unsigned long nr_pages
)
320 static inline void remove_memory(int nid
, u64 start
, u64 size
) {}
321 #endif /* CONFIG_MEMORY_HOTREMOVE */
323 extern int walk_memory_range(unsigned long start_pfn
, unsigned long end_pfn
,
324 void *arg
, int (*func
)(struct memory_block
*, void *));
325 extern int __add_memory(int nid
, u64 start
, u64 size
);
326 extern int add_memory(int nid
, u64 start
, u64 size
);
327 extern int add_memory_resource(int nid
, struct resource
*resource
, bool online
);
328 extern int arch_add_memory(int nid
, u64 start
, u64 size
, bool want_memblock
);
329 extern void move_pfn_range_to_zone(struct zone
*zone
, unsigned long start_pfn
,
330 unsigned long nr_pages
);
331 extern int offline_pages(unsigned long start_pfn
, unsigned long nr_pages
);
332 extern bool is_memblock_offlined(struct memory_block
*mem
);
333 extern void remove_memory(int nid
, u64 start
, u64 size
);
334 extern int sparse_add_one_section(struct pglist_data
*pgdat
, unsigned long start_pfn
);
335 extern void sparse_remove_one_section(struct zone
*zone
, struct mem_section
*ms
,
336 unsigned long map_offset
);
337 extern struct page
*sparse_decode_mem_map(unsigned long coded_mem_map
,
339 extern bool allow_online_pfn_range(int nid
, unsigned long pfn
, unsigned long nr_pages
,
341 extern struct zone
*zone_for_pfn_range(int online_type
, int nid
, unsigned start_pfn
,
342 unsigned long nr_pages
);
343 #endif /* __LINUX_MEMORY_HOTPLUG_H */