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 ___nr = pfn_to_section_nr(pfn); \
29 if (___nr < NR_MEM_SECTIONS && online_section_nr(___nr))\
30 ___page = pfn_to_page(pfn); \
35 * Types for free bootmem stored in page->lru.next. These have to be in
36 * some random range in unsigned long space for debugging purposes.
39 MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE
= 12,
40 SECTION_INFO
= MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE
,
43 MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE
= NODE_INFO
,
46 /* Types for control the zone type of onlined and offlined memory */
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 int test_pages_in_a_zone(unsigned long start_pfn
, unsigned long end_pfn
,
87 unsigned long *valid_start
, unsigned long *valid_end
);
88 extern void __offline_isolated_pages(unsigned long, unsigned long);
90 typedef void (*online_page_callback_t
)(struct page
*page
);
92 extern int set_online_page_callback(online_page_callback_t callback
);
93 extern int restore_online_page_callback(online_page_callback_t callback
);
95 extern void __online_page_set_limits(struct page
*page
);
96 extern void __online_page_increment_counters(struct page
*page
);
97 extern void __online_page_free(struct page
*page
);
99 extern int try_online_node(int nid
);
101 extern bool memhp_auto_online
;
102 /* If movable_node boot option specified */
103 extern bool movable_node_enabled
;
104 static inline bool movable_node_is_enabled(void)
106 return movable_node_enabled
;
109 #ifdef CONFIG_MEMORY_HOTREMOVE
110 extern int arch_remove_memory(int nid
, u64 start
, u64 size
,
111 struct vmem_altmap
*altmap
);
112 extern int __remove_pages(struct zone
*zone
, unsigned long start_pfn
,
113 unsigned long nr_pages
, struct vmem_altmap
*altmap
);
114 #endif /* CONFIG_MEMORY_HOTREMOVE */
116 /* reasonably generic interface to expand the physical pages */
117 extern int __add_pages(int nid
, unsigned long start_pfn
, unsigned long nr_pages
,
118 struct vmem_altmap
*altmap
, bool want_memblock
);
120 #ifndef CONFIG_ARCH_HAS_ADD_PAGES
121 static inline int add_pages(int nid
, unsigned long start_pfn
,
122 unsigned long nr_pages
, struct vmem_altmap
*altmap
,
125 return __add_pages(nid
, start_pfn
, nr_pages
, altmap
, want_memblock
);
127 #else /* ARCH_HAS_ADD_PAGES */
128 int add_pages(int nid
, unsigned long start_pfn
, unsigned long nr_pages
,
129 struct vmem_altmap
*altmap
, bool want_memblock
);
130 #endif /* ARCH_HAS_ADD_PAGES */
133 extern int memory_add_physaddr_to_nid(u64 start
);
135 static inline int memory_add_physaddr_to_nid(u64 start
)
141 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
143 * For supporting node-hotadd, we have to allocate a new pgdat.
145 * If an arch has generic style NODE_DATA(),
146 * node_data[nid] = kzalloc() works well. But it depends on the architecture.
148 * In general, generic_alloc_nodedata() is used.
149 * Now, arch_free_nodedata() is just defined for error path of node_hot_add.
152 extern pg_data_t
*arch_alloc_nodedata(int nid
);
153 extern void arch_free_nodedata(pg_data_t
*pgdat
);
154 extern void arch_refresh_nodedata(int nid
, pg_data_t
*pgdat
);
156 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
158 #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid)
159 #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat)
163 * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat.
164 * XXX: kmalloc_node() can't work well to get new node's memory at this time.
165 * Because, pgdat for the new node is not allocated/initialized yet itself.
166 * To use new node's memory, more consideration will be necessary.
168 #define generic_alloc_nodedata(nid) \
170 kzalloc(sizeof(pg_data_t), GFP_KERNEL); \
173 * This definition is just for error path in node hotadd.
174 * For node hotremove, we have to replace this.
176 #define generic_free_nodedata(pgdat) kfree(pgdat)
178 extern pg_data_t
*node_data
[];
179 static inline void arch_refresh_nodedata(int nid
, pg_data_t
*pgdat
)
181 node_data
[nid
] = pgdat
;
184 #else /* !CONFIG_NUMA */
187 static inline pg_data_t
*generic_alloc_nodedata(int nid
)
192 static inline void generic_free_nodedata(pg_data_t
*pgdat
)
195 static inline void arch_refresh_nodedata(int nid
, pg_data_t
*pgdat
)
198 #endif /* CONFIG_NUMA */
199 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
201 #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
202 extern void __init
register_page_bootmem_info_node(struct pglist_data
*pgdat
);
204 static inline void register_page_bootmem_info_node(struct pglist_data
*pgdat
)
208 extern void put_page_bootmem(struct page
*page
);
209 extern void get_page_bootmem(unsigned long ingo
, struct page
*page
,
212 void get_online_mems(void);
213 void put_online_mems(void);
215 void mem_hotplug_begin(void);
216 void mem_hotplug_done(void);
218 extern void set_zone_contiguous(struct zone
*zone
);
219 extern void clear_zone_contiguous(struct zone
*zone
);
221 #else /* ! CONFIG_MEMORY_HOTPLUG */
222 #define pfn_to_online_page(pfn) \
224 struct page *___page = NULL; \
225 if (pfn_valid(pfn)) \
226 ___page = pfn_to_page(pfn); \
230 static inline unsigned zone_span_seqbegin(struct zone
*zone
)
234 static inline int zone_span_seqretry(struct zone
*zone
, unsigned iv
)
238 static inline void zone_span_writelock(struct zone
*zone
) {}
239 static inline void zone_span_writeunlock(struct zone
*zone
) {}
240 static inline void zone_seqlock_init(struct zone
*zone
) {}
242 static inline int mhp_notimplemented(const char *func
)
244 printk(KERN_WARNING
"%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func
);
249 static inline void register_page_bootmem_info_node(struct pglist_data
*pgdat
)
253 static inline int try_online_node(int nid
)
258 static inline void get_online_mems(void) {}
259 static inline void put_online_mems(void) {}
261 static inline void mem_hotplug_begin(void) {}
262 static inline void mem_hotplug_done(void) {}
264 static inline bool movable_node_is_enabled(void)
268 #endif /* ! CONFIG_MEMORY_HOTPLUG */
270 #if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT)
272 * pgdat resizing functions
275 void pgdat_resize_lock(struct pglist_data
*pgdat
, unsigned long *flags
)
277 spin_lock_irqsave(&pgdat
->node_size_lock
, *flags
);
280 void pgdat_resize_unlock(struct pglist_data
*pgdat
, unsigned long *flags
)
282 spin_unlock_irqrestore(&pgdat
->node_size_lock
, *flags
);
285 void pgdat_resize_init(struct pglist_data
*pgdat
)
287 spin_lock_init(&pgdat
->node_size_lock
);
289 #else /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
291 * Stub functions for when hotplug is off
293 static inline void pgdat_resize_lock(struct pglist_data
*p
, unsigned long *f
) {}
294 static inline void pgdat_resize_unlock(struct pglist_data
*p
, unsigned long *f
) {}
295 static inline void pgdat_resize_init(struct pglist_data
*pgdat
) {}
296 #endif /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
298 #ifdef CONFIG_MEMORY_HOTREMOVE
300 extern bool is_mem_section_removable(unsigned long pfn
, unsigned long nr_pages
);
301 extern void try_offline_node(int nid
);
302 extern int offline_pages(unsigned long start_pfn
, unsigned long nr_pages
);
303 extern void remove_memory(int nid
, u64 start
, u64 size
);
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 static inline void __remove_memory(int nid
, u64 start
, u64 size
) {}
322 #endif /* CONFIG_MEMORY_HOTREMOVE */
324 extern void __ref
free_area_init_core_hotplug(int nid
);
325 extern int walk_memory_range(unsigned long start_pfn
, unsigned long end_pfn
,
326 void *arg
, int (*func
)(struct memory_block
*, void *));
327 extern int __add_memory(int nid
, u64 start
, u64 size
);
328 extern int add_memory(int nid
, u64 start
, u64 size
);
329 extern int add_memory_resource(int nid
, struct resource
*resource
);
330 extern int arch_add_memory(int nid
, u64 start
, u64 size
,
331 struct vmem_altmap
*altmap
, bool want_memblock
);
332 extern void move_pfn_range_to_zone(struct zone
*zone
, unsigned long start_pfn
,
333 unsigned long nr_pages
, struct vmem_altmap
*altmap
);
334 extern bool is_memblock_offlined(struct memory_block
*mem
);
335 extern int sparse_add_one_section(int nid
, unsigned long start_pfn
,
336 struct vmem_altmap
*altmap
);
337 extern void sparse_remove_one_section(struct zone
*zone
, struct mem_section
*ms
,
338 unsigned long map_offset
, struct vmem_altmap
*altmap
);
339 extern struct page
*sparse_decode_mem_map(unsigned long coded_mem_map
,
341 extern bool allow_online_pfn_range(int nid
, unsigned long pfn
, unsigned long nr_pages
,
343 extern struct zone
*zone_for_pfn_range(int online_type
, int nid
, unsigned start_pfn
,
344 unsigned long nr_pages
);
345 #endif /* __LINUX_MEMORY_HOTPLUG_H */