xref: /linux-6.15/include/linux/memory_hotplug.h (revision 5693fa74)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __LINUX_MEMORY_HOTPLUG_H
3 #define __LINUX_MEMORY_HOTPLUG_H
4 
5 #include <linux/mmzone.h>
6 #include <linux/spinlock.h>
7 #include <linux/notifier.h>
8 #include <linux/bug.h>
9 
10 struct page;
11 struct zone;
12 struct pglist_data;
13 struct mem_section;
14 struct memory_block;
15 struct memory_group;
16 struct resource;
17 struct vmem_altmap;
18 
19 #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION
20 /*
21  * For supporting node-hotadd, we have to allocate a new pgdat.
22  *
23  * If an arch has generic style NODE_DATA(),
24  * node_data[nid] = kzalloc() works well. But it depends on the architecture.
25  *
26  * In general, generic_alloc_nodedata() is used.
27  *
28  */
29 extern pg_data_t *arch_alloc_nodedata(int nid);
30 extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat);
31 
32 #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
33 
34 #define arch_alloc_nodedata(nid)	generic_alloc_nodedata(nid)
35 
36 #ifdef CONFIG_NUMA
37 /*
38  * XXX: node aware allocation can't work well to get new node's memory at this time.
39  *	Because, pgdat for the new node is not allocated/initialized yet itself.
40  *	To use new node's memory, more consideration will be necessary.
41  */
42 #define generic_alloc_nodedata(nid)				\
43 ({								\
44 	memblock_alloc(sizeof(*pgdat), SMP_CACHE_BYTES);	\
45 })
46 /*
47  * This definition is just for error path in node hotadd.
48  * For node hotremove, we have to replace this.
49  */
50 #define generic_free_nodedata(pgdat)	kfree(pgdat)
51 
52 extern pg_data_t *node_data[];
53 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
54 {
55 	node_data[nid] = pgdat;
56 }
57 
58 #else /* !CONFIG_NUMA */
59 
60 /* never called */
61 static inline pg_data_t *generic_alloc_nodedata(int nid)
62 {
63 	BUG();
64 	return NULL;
65 }
66 static inline void generic_free_nodedata(pg_data_t *pgdat)
67 {
68 }
69 static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat)
70 {
71 }
72 #endif /* CONFIG_NUMA */
73 #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */
74 
75 #ifdef CONFIG_MEMORY_HOTPLUG
76 struct page *pfn_to_online_page(unsigned long pfn);
77 
78 /* Types for control the zone type of onlined and offlined memory */
79 enum {
80 	/* Offline the memory. */
81 	MMOP_OFFLINE = 0,
82 	/* Online the memory. Zone depends, see default_zone_for_pfn(). */
83 	MMOP_ONLINE,
84 	/* Online the memory to ZONE_NORMAL. */
85 	MMOP_ONLINE_KERNEL,
86 	/* Online the memory to ZONE_MOVABLE. */
87 	MMOP_ONLINE_MOVABLE,
88 };
89 
90 /* Flags for add_memory() and friends to specify memory hotplug details. */
91 typedef int __bitwise mhp_t;
92 
93 /* No special request */
94 #define MHP_NONE		((__force mhp_t)0)
95 /*
96  * Allow merging of the added System RAM resource with adjacent,
97  * mergeable resources. After a successful call to add_memory_resource()
98  * with this flag set, the resource pointer must no longer be used as it
99  * might be stale, or the resource might have changed.
100  */
101 #define MHP_MERGE_RESOURCE	((__force mhp_t)BIT(0))
102 
103 /*
104  * We want memmap (struct page array) to be self contained.
105  * To do so, we will use the beginning of the hot-added range to build
106  * the page tables for the memmap array that describes the entire range.
107  * Only selected architectures support it with SPARSE_VMEMMAP.
108  */
109 #define MHP_MEMMAP_ON_MEMORY   ((__force mhp_t)BIT(1))
110 /*
111  * The nid field specifies a memory group id (mgid) instead. The memory group
112  * implies the node id (nid).
113  */
114 #define MHP_NID_IS_MGID		((__force mhp_t)BIT(2))
115 
116 /*
117  * Extended parameters for memory hotplug:
118  * altmap: alternative allocator for memmap array (optional)
119  * pgprot: page protection flags to apply to newly created page tables
120  *	(required)
121  */
122 struct mhp_params {
123 	struct vmem_altmap *altmap;
124 	pgprot_t pgprot;
125 };
126 
127 bool mhp_range_allowed(u64 start, u64 size, bool need_mapping);
128 struct range mhp_get_pluggable_range(bool need_mapping);
129 
130 /*
131  * Zone resizing functions
132  *
133  * Note: any attempt to resize a zone should has pgdat_resize_lock()
134  * zone_span_writelock() both held. This ensure the size of a zone
135  * can't be changed while pgdat_resize_lock() held.
136  */
137 static inline unsigned zone_span_seqbegin(struct zone *zone)
138 {
139 	return read_seqbegin(&zone->span_seqlock);
140 }
141 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
142 {
143 	return read_seqretry(&zone->span_seqlock, iv);
144 }
145 static inline void zone_span_writelock(struct zone *zone)
146 {
147 	write_seqlock(&zone->span_seqlock);
148 }
149 static inline void zone_span_writeunlock(struct zone *zone)
150 {
151 	write_sequnlock(&zone->span_seqlock);
152 }
153 static inline void zone_seqlock_init(struct zone *zone)
154 {
155 	seqlock_init(&zone->span_seqlock);
156 }
157 extern void adjust_present_page_count(struct page *page,
158 				      struct memory_group *group,
159 				      long nr_pages);
160 /* VM interface that may be used by firmware interface */
161 extern int mhp_init_memmap_on_memory(unsigned long pfn, unsigned long nr_pages,
162 				     struct zone *zone);
163 extern void mhp_deinit_memmap_on_memory(unsigned long pfn, unsigned long nr_pages);
164 extern int online_pages(unsigned long pfn, unsigned long nr_pages,
165 			struct zone *zone, struct memory_group *group);
166 extern void __offline_isolated_pages(unsigned long start_pfn,
167 				     unsigned long end_pfn);
168 
169 typedef void (*online_page_callback_t)(struct page *page, unsigned int order);
170 
171 extern void generic_online_page(struct page *page, unsigned int order);
172 extern int set_online_page_callback(online_page_callback_t callback);
173 extern int restore_online_page_callback(online_page_callback_t callback);
174 
175 extern int try_online_node(int nid);
176 
177 extern int arch_add_memory(int nid, u64 start, u64 size,
178 			   struct mhp_params *params);
179 extern u64 max_mem_size;
180 
181 extern int mhp_online_type_from_str(const char *str);
182 
183 /* Default online_type (MMOP_*) when new memory blocks are added. */
184 extern int mhp_default_online_type;
185 /* If movable_node boot option specified */
186 extern bool movable_node_enabled;
187 static inline bool movable_node_is_enabled(void)
188 {
189 	return movable_node_enabled;
190 }
191 
192 extern void arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap);
193 extern void __remove_pages(unsigned long start_pfn, unsigned long nr_pages,
194 			   struct vmem_altmap *altmap);
195 
196 /* reasonably generic interface to expand the physical pages */
197 extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
198 		       struct mhp_params *params);
199 
200 #ifndef CONFIG_ARCH_HAS_ADD_PAGES
201 static inline int add_pages(int nid, unsigned long start_pfn,
202 		unsigned long nr_pages, struct mhp_params *params)
203 {
204 	return __add_pages(nid, start_pfn, nr_pages, params);
205 }
206 #else /* ARCH_HAS_ADD_PAGES */
207 int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages,
208 	      struct mhp_params *params);
209 #endif /* ARCH_HAS_ADD_PAGES */
210 
211 void get_online_mems(void);
212 void put_online_mems(void);
213 
214 void mem_hotplug_begin(void);
215 void mem_hotplug_done(void);
216 
217 #else /* ! CONFIG_MEMORY_HOTPLUG */
218 #define pfn_to_online_page(pfn)			\
219 ({						\
220 	struct page *___page = NULL;		\
221 	if (pfn_valid(pfn))			\
222 		___page = pfn_to_page(pfn);	\
223 	___page;				\
224  })
225 
226 static inline unsigned zone_span_seqbegin(struct zone *zone)
227 {
228 	return 0;
229 }
230 static inline int zone_span_seqretry(struct zone *zone, unsigned iv)
231 {
232 	return 0;
233 }
234 static inline void zone_span_writelock(struct zone *zone) {}
235 static inline void zone_span_writeunlock(struct zone *zone) {}
236 static inline void zone_seqlock_init(struct zone *zone) {}
237 
238 static inline int try_online_node(int nid)
239 {
240 	return 0;
241 }
242 
243 static inline void get_online_mems(void) {}
244 static inline void put_online_mems(void) {}
245 
246 static inline void mem_hotplug_begin(void) {}
247 static inline void mem_hotplug_done(void) {}
248 
249 static inline bool movable_node_is_enabled(void)
250 {
251 	return false;
252 }
253 #endif /* ! CONFIG_MEMORY_HOTPLUG */
254 
255 /*
256  * Keep this declaration outside CONFIG_MEMORY_HOTPLUG as some
257  * platforms might override and use arch_get_mappable_range()
258  * for internal non memory hotplug purposes.
259  */
260 struct range arch_get_mappable_range(void);
261 
262 #if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT)
263 /*
264  * pgdat resizing functions
265  */
266 static inline
267 void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags)
268 {
269 	spin_lock_irqsave(&pgdat->node_size_lock, *flags);
270 }
271 static inline
272 void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags)
273 {
274 	spin_unlock_irqrestore(&pgdat->node_size_lock, *flags);
275 }
276 static inline
277 void pgdat_resize_init(struct pglist_data *pgdat)
278 {
279 	spin_lock_init(&pgdat->node_size_lock);
280 }
281 #else /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
282 /*
283  * Stub functions for when hotplug is off
284  */
285 static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {}
286 static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {}
287 static inline void pgdat_resize_init(struct pglist_data *pgdat) {}
288 #endif /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */
289 
290 #ifdef CONFIG_MEMORY_HOTREMOVE
291 
292 extern void try_offline_node(int nid);
293 extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages,
294 			 struct zone *zone, struct memory_group *group);
295 extern int remove_memory(u64 start, u64 size);
296 extern void __remove_memory(u64 start, u64 size);
297 extern int offline_and_remove_memory(u64 start, u64 size);
298 
299 #else
300 static inline void try_offline_node(int nid) {}
301 
302 static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages,
303 				struct zone *zone, struct memory_group *group)
304 {
305 	return -EINVAL;
306 }
307 
308 static inline int remove_memory(u64 start, u64 size)
309 {
310 	return -EBUSY;
311 }
312 
313 static inline void __remove_memory(u64 start, u64 size) {}
314 #endif /* CONFIG_MEMORY_HOTREMOVE */
315 
316 extern void set_zone_contiguous(struct zone *zone);
317 extern void clear_zone_contiguous(struct zone *zone);
318 
319 #ifdef CONFIG_MEMORY_HOTPLUG
320 extern void __ref free_area_init_core_hotplug(struct pglist_data *pgdat);
321 extern int __add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags);
322 extern int add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags);
323 extern int add_memory_resource(int nid, struct resource *resource,
324 			       mhp_t mhp_flags);
325 extern int add_memory_driver_managed(int nid, u64 start, u64 size,
326 				     const char *resource_name,
327 				     mhp_t mhp_flags);
328 extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn,
329 				   unsigned long nr_pages,
330 				   struct vmem_altmap *altmap, int migratetype);
331 extern void remove_pfn_range_from_zone(struct zone *zone,
332 				       unsigned long start_pfn,
333 				       unsigned long nr_pages);
334 extern bool is_memblock_offlined(struct memory_block *mem);
335 extern int sparse_add_section(int nid, unsigned long pfn,
336 		unsigned long nr_pages, struct vmem_altmap *altmap);
337 extern void sparse_remove_section(struct mem_section *ms,
338 		unsigned long pfn, unsigned long nr_pages,
339 		unsigned long map_offset, struct vmem_altmap *altmap);
340 extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map,
341 					  unsigned long pnum);
342 extern struct zone *zone_for_pfn_range(int online_type, int nid,
343 		struct memory_group *group, unsigned long start_pfn,
344 		unsigned long nr_pages);
345 extern int arch_create_linear_mapping(int nid, u64 start, u64 size,
346 				      struct mhp_params *params);
347 void arch_remove_linear_mapping(u64 start, u64 size);
348 extern bool mhp_supports_memmap_on_memory(unsigned long size);
349 #endif /* CONFIG_MEMORY_HOTPLUG */
350 
351 #endif /* __LINUX_MEMORY_HOTPLUG_H */
352