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>
18 #ifdef CONFIG_MEMORY_HOTPLUG
20 * Return page for the valid pfn only if the page is online. All pfn
21 * walkers which rely on the fully initialized page->flags and others
22 * should use this rather than pfn_valid && pfn_to_page
24 #define pfn_to_online_page(pfn) \
26 struct page *___page = NULL; \
27 unsigned long ___pfn = pfn; \
28 unsigned long ___nr = pfn_to_section_nr(___pfn); \
30 if (___nr < NR_MEM_SECTIONS && online_section_nr(___nr) && \
31 pfn_valid_within(___pfn)) \
32 ___page = pfn_to_page(___pfn); \
37 * Types for free bootmem stored in page->lru.next. These have to be in
38 * some random range in unsigned long space for debugging purposes.
41 MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE
= 12,
42 SECTION_INFO
= MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE
,
45 MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE
= NODE_INFO
,
48 /* Types for control the zone type of onlined and offlined memory */
57 * Zone resizing functions
59 * Note: any attempt to resize a zone should has pgdat_resize_lock()
60 * zone_span_writelock() both held. This ensure the size of a zone
61 * can't be changed while pgdat_resize_lock() held.
63 static inline unsigned zone_span_seqbegin(struct zone
*zone
)
65 return read_seqbegin(&zone
->span_seqlock
);
67 static inline int zone_span_seqretry(struct zone
*zone
, unsigned iv
)
69 return read_seqretry(&zone
->span_seqlock
, iv
);
71 static inline void zone_span_writelock(struct zone
*zone
)
73 write_seqlock(&zone
->span_seqlock
);
75 static inline void zone_span_writeunlock(struct zone
*zone
)
77 write_sequnlock(&zone
->span_seqlock
);
79 static inline void zone_seqlock_init(struct zone
*zone
)
81 seqlock_init(&zone
->span_seqlock
);
83 extern int zone_grow_free_lists(struct zone
*zone
, unsigned long new_nr_pages
);
84 extern int zone_grow_waitqueues(struct zone
*zone
, unsigned long nr_pages
);
85 extern int add_one_highpage(struct page
*page
, int pfn
, int bad_ppro
);
86 /* VM interface that may be used by firmware interface */
87 extern int online_pages(unsigned long, unsigned long, int);
88 extern int test_pages_in_a_zone(unsigned long start_pfn
, unsigned long end_pfn
,
89 unsigned long *valid_start
, unsigned long *valid_end
);
90 extern void __offline_isolated_pages(unsigned long, unsigned long);
92 typedef void (*online_page_callback_t
)(struct page
*page
);
94 extern int set_online_page_callback(online_page_callback_t callback
);
95 extern int restore_online_page_callback(online_page_callback_t callback
);
97 extern void __online_page_set_limits(struct page
*page
);
98 extern void __online_page_increment_counters(struct page
*page
);
99 extern void __online_page_free(struct page
*page
);
101 extern int try_online_node(int nid
);
103 extern bool memhp_auto_online
;
104 /* If movable_node boot option specified */
105 extern bool movable_node_enabled
;
106 static inline bool movable_node_is_enabled(void)
108 return movable_node_enabled
;
111 #ifdef CONFIG_MEMORY_HOTREMOVE
112 extern int arch_remove_memory(int nid
, u64 start
, u64 size
,
113 struct vmem_altmap
*altmap
);
114 extern int __remove_pages(struct zone
*zone
, unsigned long start_pfn
,
115 unsigned long nr_pages
, struct vmem_altmap
*altmap
);
116 #endif /* CONFIG_MEMORY_HOTREMOVE */
118 /* reasonably generic interface to expand the physical pages */
119 extern int __add_pages(int nid
, unsigned long start_pfn
, unsigned long nr_pages
,
120 struct vmem_altmap
*altmap
, bool want_memblock
);
122 #ifndef CONFIG_ARCH_HAS_ADD_PAGES
123 static inline int add_pages(int nid
, unsigned long start_pfn
,
124 unsigned long nr_pages
, struct vmem_altmap
*altmap
,
127 return __add_pages(nid
, start_pfn
, nr_pages
, altmap
, want_memblock
);
129 #else /* ARCH_HAS_ADD_PAGES */
130 int add_pages(int nid
, unsigned long start_pfn
, unsigned long nr_pages
,
131 struct vmem_altmap
*altmap
, bool want_memblock
);
132 #endif /* ARCH_HAS_ADD_PAGES */
135 extern int memory_add_physaddr_to_nid(u64 start
);
137 static inline int memory_add_physaddr_to_nid(u64 start
)
143 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
145 * For supporting node-hotadd, we have to allocate a new pgdat.
147 * If an arch has generic style NODE_DATA(),
148 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
150 * In general, generic_alloc_nodedata() is used.
151 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
154 extern pg_data_t
*arch_alloc_nodedata(int nid
);
155 extern void arch_free_nodedata(pg_data_t
*pgdat
);
156 extern void arch_refresh_nodedata(int nid
, pg_data_t
*pgdat
);
158 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
160 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
161 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
165 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
166 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
167 * Because, pgdat for the new node is not allocated/initialized yet itself.
168 * To use new node's memory, more consideration will be necessary.
170 #define generic_alloc_nodedata(nid) \
172 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
175 * This definition is just for error path in node hotadd.
176 * For node hotremove, we have to replace this.
178 #define generic_free_nodedata(pgdat) kfree(pgdat)
180 extern pg_data_t
*node_data
[];
181 static inline void arch_refresh_nodedata(int nid
, pg_data_t
*pgdat
)
183 node_data
[nid
] = pgdat
;
186 #else /* !CONFIG_NUMA */
189 static inline pg_data_t
*generic_alloc_nodedata(int nid
)
194 static inline void generic_free_nodedata(pg_data_t
*pgdat
)
197 static inline void arch_refresh_nodedata(int nid
, pg_data_t
*pgdat
)
200 #endif /* CONFIG_NUMA */
201 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
203 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
204 extern void __init
register_page_bootmem_info_node(struct pglist_data
*pgdat
);
206 static inline void register_page_bootmem_info_node(struct pglist_data
*pgdat
)
210 extern void put_page_bootmem(struct page
*page
);
211 extern void get_page_bootmem(unsigned long ingo
, struct page
*page
,
214 void get_online_mems(void);
215 void put_online_mems(void);
217 void mem_hotplug_begin(void);
218 void mem_hotplug_done(void);
220 extern void set_zone_contiguous(struct zone
*zone
);
221 extern void clear_zone_contiguous(struct zone
*zone
);
223 #else /* ! CONFIG_MEMORY_HOTPLUG */
224 #define pfn_to_online_page(pfn) \
226 struct page *___page = NULL; \
227 if (pfn_valid(pfn)) \
228 ___page = pfn_to_page(pfn); \
232 static inline unsigned zone_span_seqbegin(struct zone
*zone
)
236 static inline int zone_span_seqretry(struct zone
*zone
, unsigned iv
)
240 static inline void zone_span_writelock(struct zone
*zone
) {}
241 static inline void zone_span_writeunlock(struct zone
*zone
) {}
242 static inline void zone_seqlock_init(struct zone
*zone
) {}
244 static inline int mhp_notimplemented(const char *func
)
246 printk(KERN_WARNING
"%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func
);
251 static inline void register_page_bootmem_info_node(struct pglist_data
*pgdat
)
255 static inline int try_online_node(int nid
)
260 static inline void get_online_mems(void) {}
261 static inline void put_online_mems(void) {}
263 static inline void mem_hotplug_begin(void) {}
264 static inline void mem_hotplug_done(void) {}
266 static inline bool movable_node_is_enabled(void)
270 #endif /* ! CONFIG_MEMORY_HOTPLUG */
272 #if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT)
274 * pgdat resizing functions
277 void pgdat_resize_lock(struct pglist_data
*pgdat
, unsigned long *flags
)
279 spin_lock_irqsave(&pgdat
->node_size_lock
, *flags
);
282 void pgdat_resize_unlock(struct pglist_data
*pgdat
, unsigned long *flags
)
284 spin_unlock_irqrestore(&pgdat
->node_size_lock
, *flags
);
287 void pgdat_resize_init(struct pglist_data
*pgdat
)
289 spin_lock_init(&pgdat
->node_size_lock
);
291 #else /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
293 * Stub functions for when hotplug is off
295 static inline void pgdat_resize_lock(struct pglist_data
*p
, unsigned long *f
) {}
296 static inline void pgdat_resize_unlock(struct pglist_data
*p
, unsigned long *f
) {}
297 static inline void pgdat_resize_init(struct pglist_data
*pgdat
) {}
298 #endif /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
300 #ifdef CONFIG_MEMORY_HOTREMOVE
302 extern bool is_mem_section_removable(unsigned long pfn
, unsigned long nr_pages
);
303 extern void try_offline_node(int nid
);
304 extern int offline_pages(unsigned long start_pfn
, unsigned long nr_pages
);
305 extern void remove_memory(int nid
, u64 start
, u64 size
);
306 extern void __remove_memory(int nid
, u64 start
, u64 size
);
309 static inline bool is_mem_section_removable(unsigned long pfn
,
310 unsigned long nr_pages
)
315 static inline void try_offline_node(int nid
) {}
317 static inline int offline_pages(unsigned long start_pfn
, unsigned long nr_pages
)
322 static inline void remove_memory(int nid
, u64 start
, u64 size
) {}
323 static inline void __remove_memory(int nid
, u64 start
, u64 size
) {}
324 #endif /* CONFIG_MEMORY_HOTREMOVE */
326 extern void __ref
free_area_init_core_hotplug(int nid
);
327 extern int walk_memory_range(unsigned long start_pfn
, unsigned long end_pfn
,
328 void *arg
, int (*func
)(struct memory_block
*, void *));
329 extern int __add_memory(int nid
, u64 start
, u64 size
);
330 extern int add_memory(int nid
, u64 start
, u64 size
);
331 extern int add_memory_resource(int nid
, struct resource
*resource
);
332 extern int arch_add_memory(int nid
, u64 start
, u64 size
,
333 struct vmem_altmap
*altmap
, bool want_memblock
);
334 extern void move_pfn_range_to_zone(struct zone
*zone
, unsigned long start_pfn
,
335 unsigned long nr_pages
, struct vmem_altmap
*altmap
);
336 extern bool is_memblock_offlined(struct memory_block
*mem
);
337 extern int sparse_add_one_section(int nid
, unsigned long start_pfn
,
338 struct vmem_altmap
*altmap
);
339 extern void sparse_remove_one_section(struct zone
*zone
, struct mem_section
*ms
,
340 unsigned long map_offset
, struct vmem_altmap
*altmap
);
341 extern struct page
*sparse_decode_mem_map(unsigned long coded_mem_map
,
343 extern bool allow_online_pfn_range(int nid
, unsigned long pfn
, unsigned long nr_pages
,
345 extern struct zone
*zone_for_pfn_range(int online_type
, int nid
, unsigned start_pfn
,
346 unsigned long nr_pages
);
347 #endif /* __LINUX_MEMORY_HOTPLUG_H */