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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
208d54e5 DH |
2 | #ifndef __LINUX_MEMORY_HOTPLUG_H |
3 | #define __LINUX_MEMORY_HOTPLUG_H | |
4 | ||
5 | #include <linux/mmzone.h> | |
6 | #include <linux/spinlock.h> | |
3947be19 | 7 | #include <linux/notifier.h> |
187f1882 | 8 | #include <linux/bug.h> |
208d54e5 | 9 | |
78679302 KH |
10 | struct page; |
11 | struct zone; | |
12 | struct pglist_data; | |
ea01ea93 | 13 | struct mem_section; |
e90bdb7f | 14 | struct memory_block; |
62cedb9f | 15 | struct resource; |
24e6d5a5 | 16 | struct vmem_altmap; |
78679302 | 17 | |
208d54e5 | 18 | #ifdef CONFIG_MEMORY_HOTPLUG |
9f605f26 | 19 | struct page *pfn_to_online_page(unsigned long pfn); |
04753278 YG |
20 | |
21 | /* | |
5f24ce5f AA |
22 | * Types for free bootmem stored in page->lru.next. These have to be in |
23 | * some random range in unsigned long space for debugging purposes. | |
04753278 | 24 | */ |
5f24ce5f AA |
25 | enum { |
26 | MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12, | |
27 | SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE, | |
28 | MIX_SECTION_INFO, | |
29 | NODE_INFO, | |
30 | MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO, | |
31 | }; | |
04753278 | 32 | |
4f7c6b49 | 33 | /* Types for control the zone type of onlined and offlined memory */ |
511c2aba | 34 | enum { |
956f8b44 | 35 | /* Offline the memory. */ |
efc978ad | 36 | MMOP_OFFLINE = 0, |
956f8b44 DH |
37 | /* Online the memory. Zone depends, see default_zone_for_pfn(). */ |
38 | MMOP_ONLINE, | |
39 | /* Online the memory to ZONE_NORMAL. */ | |
4f7c6b49 | 40 | MMOP_ONLINE_KERNEL, |
956f8b44 | 41 | /* Online the memory to ZONE_MOVABLE. */ |
4f7c6b49 | 42 | MMOP_ONLINE_MOVABLE, |
511c2aba LJ |
43 | }; |
44 | ||
b6117199 DH |
45 | /* Flags for add_memory() and friends to specify memory hotplug details. */ |
46 | typedef int __bitwise mhp_t; | |
47 | ||
48 | /* No special request */ | |
49 | #define MHP_NONE ((__force mhp_t)0) | |
9ca6551e DH |
50 | /* |
51 | * Allow merging of the added System RAM resource with adjacent, | |
52 | * mergeable resources. After a successful call to add_memory_resource() | |
53 | * with this flag set, the resource pointer must no longer be used as it | |
54 | * might be stale, or the resource might have changed. | |
55 | */ | |
26011267 | 56 | #define MHP_MERGE_RESOURCE ((__force mhp_t)BIT(0)) |
b6117199 | 57 | |
a08a2ae3 OS |
58 | /* |
59 | * We want memmap (struct page array) to be self contained. | |
60 | * To do so, we will use the beginning of the hot-added range to build | |
61 | * the page tables for the memmap array that describes the entire range. | |
62 | * Only selected architectures support it with SPARSE_VMEMMAP. | |
63 | */ | |
64 | #define MHP_MEMMAP_ON_MEMORY ((__force mhp_t)BIT(1)) | |
65 | ||
940519f0 | 66 | /* |
f5637d3b LG |
67 | * Extended parameters for memory hotplug: |
68 | * altmap: alternative allocator for memmap array (optional) | |
bfeb022f LG |
69 | * pgprot: page protection flags to apply to newly created page tables |
70 | * (required) | |
940519f0 | 71 | */ |
f5637d3b | 72 | struct mhp_params { |
940519f0 | 73 | struct vmem_altmap *altmap; |
bfeb022f | 74 | pgprot_t pgprot; |
940519f0 MH |
75 | }; |
76 | ||
bca3feaa AK |
77 | bool mhp_range_allowed(u64 start, u64 size, bool need_mapping); |
78 | struct range mhp_get_pluggable_range(bool need_mapping); | |
79 | ||
bdc8cb98 DH |
80 | /* |
81 | * Zone resizing functions | |
511c2aba LJ |
82 | * |
83 | * Note: any attempt to resize a zone should has pgdat_resize_lock() | |
84 | * zone_span_writelock() both held. This ensure the size of a zone | |
85 | * can't be changed while pgdat_resize_lock() held. | |
bdc8cb98 DH |
86 | */ |
87 | static inline unsigned zone_span_seqbegin(struct zone *zone) | |
88 | { | |
89 | return read_seqbegin(&zone->span_seqlock); | |
90 | } | |
91 | static inline int zone_span_seqretry(struct zone *zone, unsigned iv) | |
92 | { | |
93 | return read_seqretry(&zone->span_seqlock, iv); | |
94 | } | |
95 | static inline void zone_span_writelock(struct zone *zone) | |
96 | { | |
97 | write_seqlock(&zone->span_seqlock); | |
98 | } | |
99 | static inline void zone_span_writeunlock(struct zone *zone) | |
100 | { | |
101 | write_sequnlock(&zone->span_seqlock); | |
102 | } | |
103 | static inline void zone_seqlock_init(struct zone *zone) | |
104 | { | |
105 | seqlock_init(&zone->span_seqlock); | |
106 | } | |
3947be19 DH |
107 | extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages); |
108 | extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages); | |
109 | extern int add_one_highpage(struct page *page, int pfn, int bad_ppro); | |
a08a2ae3 | 110 | extern void adjust_present_page_count(struct zone *zone, long nr_pages); |
3947be19 | 111 | /* VM interface that may be used by firmware interface */ |
a08a2ae3 OS |
112 | extern int mhp_init_memmap_on_memory(unsigned long pfn, unsigned long nr_pages, |
113 | struct zone *zone); | |
114 | extern void mhp_deinit_memmap_on_memory(unsigned long pfn, unsigned long nr_pages); | |
bd5c2344 | 115 | extern int online_pages(unsigned long pfn, unsigned long nr_pages, |
a08a2ae3 | 116 | struct zone *zone); |
92917998 DH |
117 | extern struct zone *test_pages_in_a_zone(unsigned long start_pfn, |
118 | unsigned long end_pfn); | |
257bea71 DH |
119 | extern void __offline_isolated_pages(unsigned long start_pfn, |
120 | unsigned long end_pfn); | |
48e94196 | 121 | |
a9cd410a | 122 | typedef void (*online_page_callback_t)(struct page *page, unsigned int order); |
9d0ad8ca | 123 | |
18db1491 | 124 | extern void generic_online_page(struct page *page, unsigned int order); |
9d0ad8ca DK |
125 | extern int set_online_page_callback(online_page_callback_t callback); |
126 | extern int restore_online_page_callback(online_page_callback_t callback); | |
127 | ||
01b0f197 TK |
128 | extern int try_online_node(int nid); |
129 | ||
940519f0 | 130 | extern int arch_add_memory(int nid, u64 start, u64 size, |
f5637d3b | 131 | struct mhp_params *params); |
357b4da5 JG |
132 | extern u64 max_mem_size; |
133 | ||
1adf8b46 | 134 | extern int mhp_online_type_from_str(const char *str); |
5f47adf7 | 135 | |
862919e5 | 136 | /* Default online_type (MMOP_*) when new memory blocks are added. */ |
1adf8b46 | 137 | extern int mhp_default_online_type; |
4932381e MH |
138 | /* If movable_node boot option specified */ |
139 | extern bool movable_node_enabled; | |
140 | static inline bool movable_node_is_enabled(void) | |
141 | { | |
142 | return movable_node_enabled; | |
143 | } | |
31bc3858 | 144 | |
ac5c9426 DH |
145 | extern void arch_remove_memory(int nid, u64 start, u64 size, |
146 | struct vmem_altmap *altmap); | |
feee6b29 DH |
147 | extern void __remove_pages(unsigned long start_pfn, unsigned long nr_pages, |
148 | struct vmem_altmap *altmap); | |
49ac8255 | 149 | |
f1dd2cd1 | 150 | /* reasonably generic interface to expand the physical pages */ |
24e6d5a5 | 151 | extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages, |
f5637d3b | 152 | struct mhp_params *params); |
bc02af93 | 153 | |
3072e413 MH |
154 | #ifndef CONFIG_ARCH_HAS_ADD_PAGES |
155 | static inline int add_pages(int nid, unsigned long start_pfn, | |
f5637d3b | 156 | unsigned long nr_pages, struct mhp_params *params) |
3072e413 | 157 | { |
f5637d3b | 158 | return __add_pages(nid, start_pfn, nr_pages, params); |
3072e413 MH |
159 | } |
160 | #else /* ARCH_HAS_ADD_PAGES */ | |
24e6d5a5 | 161 | int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages, |
f5637d3b | 162 | struct mhp_params *params); |
3072e413 MH |
163 | #endif /* ARCH_HAS_ADD_PAGES */ |
164 | ||
306d6cbe YG |
165 | #ifdef CONFIG_HAVE_ARCH_NODEDATA_EXTENSION |
166 | /* | |
167 | * For supporting node-hotadd, we have to allocate a new pgdat. | |
168 | * | |
169 | * If an arch has generic style NODE_DATA(), | |
170 | * node_data[nid] = kzalloc() works well. But it depends on the architecture. | |
171 | * | |
172 | * In general, generic_alloc_nodedata() is used. | |
173 | * Now, arch_free_nodedata() is just defined for error path of node_hot_add. | |
174 | * | |
175 | */ | |
dd0932d9 YG |
176 | extern pg_data_t *arch_alloc_nodedata(int nid); |
177 | extern void arch_free_nodedata(pg_data_t *pgdat); | |
7049027c | 178 | extern void arch_refresh_nodedata(int nid, pg_data_t *pgdat); |
306d6cbe YG |
179 | |
180 | #else /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ | |
181 | ||
182 | #define arch_alloc_nodedata(nid) generic_alloc_nodedata(nid) | |
183 | #define arch_free_nodedata(pgdat) generic_free_nodedata(pgdat) | |
184 | ||
185 | #ifdef CONFIG_NUMA | |
186 | /* | |
187 | * If ARCH_HAS_NODEDATA_EXTENSION=n, this func is used to allocate pgdat. | |
188 | * XXX: kmalloc_node() can't work well to get new node's memory at this time. | |
189 | * Because, pgdat for the new node is not allocated/initialized yet itself. | |
190 | * To use new node's memory, more consideration will be necessary. | |
191 | */ | |
192 | #define generic_alloc_nodedata(nid) \ | |
193 | ({ \ | |
194 | kzalloc(sizeof(pg_data_t), GFP_KERNEL); \ | |
195 | }) | |
196 | /* | |
197 | * This definition is just for error path in node hotadd. | |
198 | * For node hotremove, we have to replace this. | |
199 | */ | |
200 | #define generic_free_nodedata(pgdat) kfree(pgdat) | |
201 | ||
10ad400b YG |
202 | extern pg_data_t *node_data[]; |
203 | static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) | |
204 | { | |
205 | node_data[nid] = pgdat; | |
206 | } | |
207 | ||
306d6cbe YG |
208 | #else /* !CONFIG_NUMA */ |
209 | ||
210 | /* never called */ | |
211 | static inline pg_data_t *generic_alloc_nodedata(int nid) | |
212 | { | |
213 | BUG(); | |
214 | return NULL; | |
215 | } | |
216 | static inline void generic_free_nodedata(pg_data_t *pgdat) | |
217 | { | |
218 | } | |
10ad400b YG |
219 | static inline void arch_refresh_nodedata(int nid, pg_data_t *pgdat) |
220 | { | |
221 | } | |
306d6cbe YG |
222 | #endif /* CONFIG_NUMA */ |
223 | #endif /* CONFIG_HAVE_ARCH_NODEDATA_EXTENSION */ | |
224 | ||
46723bfa | 225 | #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE |
7ded384a | 226 | extern void __init register_page_bootmem_info_node(struct pglist_data *pgdat); |
46723bfa | 227 | #else |
04753278 YG |
228 | static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) |
229 | { | |
230 | } | |
04753278 | 231 | #endif |
46723bfa YI |
232 | extern void put_page_bootmem(struct page *page); |
233 | extern void get_page_bootmem(unsigned long ingo, struct page *page, | |
234 | unsigned long type); | |
04753278 | 235 | |
bfc8c901 VD |
236 | void get_online_mems(void); |
237 | void put_online_mems(void); | |
20d6c96b | 238 | |
30467e0b DR |
239 | void mem_hotplug_begin(void); |
240 | void mem_hotplug_done(void); | |
241 | ||
208d54e5 | 242 | #else /* ! CONFIG_MEMORY_HOTPLUG */ |
2d070eab MH |
243 | #define pfn_to_online_page(pfn) \ |
244 | ({ \ | |
245 | struct page *___page = NULL; \ | |
246 | if (pfn_valid(pfn)) \ | |
247 | ___page = pfn_to_page(pfn); \ | |
248 | ___page; \ | |
249 | }) | |
250 | ||
bdc8cb98 DH |
251 | static inline unsigned zone_span_seqbegin(struct zone *zone) |
252 | { | |
253 | return 0; | |
254 | } | |
255 | static inline int zone_span_seqretry(struct zone *zone, unsigned iv) | |
256 | { | |
257 | return 0; | |
258 | } | |
259 | static inline void zone_span_writelock(struct zone *zone) {} | |
260 | static inline void zone_span_writeunlock(struct zone *zone) {} | |
261 | static inline void zone_seqlock_init(struct zone *zone) {} | |
3947be19 | 262 | |
04753278 YG |
263 | static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) |
264 | { | |
265 | } | |
266 | ||
01b0f197 TK |
267 | static inline int try_online_node(int nid) |
268 | { | |
269 | return 0; | |
270 | } | |
271 | ||
bfc8c901 VD |
272 | static inline void get_online_mems(void) {} |
273 | static inline void put_online_mems(void) {} | |
20d6c96b | 274 | |
30467e0b DR |
275 | static inline void mem_hotplug_begin(void) {} |
276 | static inline void mem_hotplug_done(void) {} | |
277 | ||
4932381e MH |
278 | static inline bool movable_node_is_enabled(void) |
279 | { | |
280 | return false; | |
281 | } | |
bdc8cb98 | 282 | #endif /* ! CONFIG_MEMORY_HOTPLUG */ |
9d99aaa3 | 283 | |
bca3feaa AK |
284 | /* |
285 | * Keep this declaration outside CONFIG_MEMORY_HOTPLUG as some | |
286 | * platforms might override and use arch_get_mappable_range() | |
287 | * for internal non memory hotplug purposes. | |
288 | */ | |
289 | struct range arch_get_mappable_range(void); | |
290 | ||
3a2d7fa8 PT |
291 | #if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT) |
292 | /* | |
293 | * pgdat resizing functions | |
294 | */ | |
295 | static inline | |
296 | void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags) | |
297 | { | |
298 | spin_lock_irqsave(&pgdat->node_size_lock, *flags); | |
299 | } | |
300 | static inline | |
301 | void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags) | |
302 | { | |
303 | spin_unlock_irqrestore(&pgdat->node_size_lock, *flags); | |
304 | } | |
305 | static inline | |
306 | void pgdat_resize_init(struct pglist_data *pgdat) | |
307 | { | |
308 | spin_lock_init(&pgdat->node_size_lock); | |
309 | } | |
310 | #else /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */ | |
311 | /* | |
312 | * Stub functions for when hotplug is off | |
313 | */ | |
314 | static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {} | |
315 | static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {} | |
316 | static inline void pgdat_resize_init(struct pglist_data *pgdat) {} | |
317 | #endif /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */ | |
318 | ||
5c755e9f BP |
319 | #ifdef CONFIG_MEMORY_HOTREMOVE |
320 | ||
90b30cdc | 321 | extern void try_offline_node(int nid); |
aba6efc4 | 322 | extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages); |
eca499ab | 323 | extern int remove_memory(int nid, u64 start, u64 size); |
d15e5926 | 324 | extern void __remove_memory(int nid, u64 start, u64 size); |
08b3acd7 | 325 | extern int offline_and_remove_memory(int nid, u64 start, u64 size); |
5c755e9f BP |
326 | |
327 | #else | |
90b30cdc | 328 | static inline void try_offline_node(int nid) {} |
aba6efc4 RW |
329 | |
330 | static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages) | |
331 | { | |
332 | return -EINVAL; | |
333 | } | |
334 | ||
eca499ab PT |
335 | static inline int remove_memory(int nid, u64 start, u64 size) |
336 | { | |
337 | return -EBUSY; | |
338 | } | |
339 | ||
d15e5926 | 340 | static inline void __remove_memory(int nid, u64 start, u64 size) {} |
5c755e9f BP |
341 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
342 | ||
aba9817d BDC |
343 | extern void set_zone_contiguous(struct zone *zone); |
344 | extern void clear_zone_contiguous(struct zone *zone); | |
345 | ||
3a0aaefe | 346 | #ifdef CONFIG_MEMORY_HOTPLUG |
03e85f9d | 347 | extern void __ref free_area_init_core_hotplug(int nid); |
b6117199 DH |
348 | extern int __add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags); |
349 | extern int add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags); | |
350 | extern int add_memory_resource(int nid, struct resource *resource, | |
351 | mhp_t mhp_flags); | |
7b7b2721 | 352 | extern int add_memory_driver_managed(int nid, u64 start, u64 size, |
b6117199 DH |
353 | const char *resource_name, |
354 | mhp_t mhp_flags); | |
f1dd2cd1 | 355 | extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn, |
d882c006 DH |
356 | unsigned long nr_pages, |
357 | struct vmem_altmap *altmap, int migratetype); | |
feee6b29 DH |
358 | extern void remove_pfn_range_from_zone(struct zone *zone, |
359 | unsigned long start_pfn, | |
360 | unsigned long nr_pages); | |
6677e3ea | 361 | extern bool is_memblock_offlined(struct memory_block *mem); |
7ea62160 DW |
362 | extern int sparse_add_section(int nid, unsigned long pfn, |
363 | unsigned long nr_pages, struct vmem_altmap *altmap); | |
ba72b4c8 | 364 | extern void sparse_remove_section(struct mem_section *ms, |
7ea62160 | 365 | unsigned long pfn, unsigned long nr_pages, |
24b6d416 | 366 | unsigned long map_offset, struct vmem_altmap *altmap); |
04753278 YG |
367 | extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map, |
368 | unsigned long pnum); | |
e5e68930 | 369 | extern struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn, |
c246a213 | 370 | unsigned long nr_pages); |
4abb1e5b DH |
371 | extern int arch_create_linear_mapping(int nid, u64 start, u64 size, |
372 | struct mhp_params *params); | |
373 | void arch_remove_linear_mapping(u64 start, u64 size); | |
a08a2ae3 | 374 | extern bool mhp_supports_memmap_on_memory(unsigned long size); |
3a0aaefe DH |
375 | #endif /* CONFIG_MEMORY_HOTPLUG */ |
376 | ||
208d54e5 | 377 | #endif /* __LINUX_MEMORY_HOTPLUG_H */ |