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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 |
2d070eab MH |
19 | /* |
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 | |
23 | */ | |
b13bc351 QC |
24 | #define pfn_to_online_page(pfn) \ |
25 | ({ \ | |
26 | struct page *___page = NULL; \ | |
27 | unsigned long ___pfn = pfn; \ | |
28 | unsigned long ___nr = pfn_to_section_nr(___pfn); \ | |
29 | \ | |
30 | if (___nr < NR_MEM_SECTIONS && online_section_nr(___nr) && \ | |
31 | pfn_valid_within(___pfn)) \ | |
32 | ___page = pfn_to_page(___pfn); \ | |
33 | ___page; \ | |
2d070eab | 34 | }) |
04753278 YG |
35 | |
36 | /* | |
5f24ce5f AA |
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. | |
04753278 | 39 | */ |
5f24ce5f AA |
40 | enum { |
41 | MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE = 12, | |
42 | SECTION_INFO = MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE, | |
43 | MIX_SECTION_INFO, | |
44 | NODE_INFO, | |
45 | MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE = NODE_INFO, | |
46 | }; | |
04753278 | 47 | |
4f7c6b49 | 48 | /* Types for control the zone type of onlined and offlined memory */ |
511c2aba | 49 | enum { |
4f7c6b49 TC |
50 | MMOP_OFFLINE = -1, |
51 | MMOP_ONLINE_KEEP, | |
52 | MMOP_ONLINE_KERNEL, | |
53 | MMOP_ONLINE_MOVABLE, | |
511c2aba LJ |
54 | }; |
55 | ||
940519f0 MH |
56 | /* |
57 | * Restrictions for the memory hotplug: | |
58 | * flags: MHP_ flags | |
59 | * altmap: alternative allocator for memmap array | |
60 | */ | |
61 | struct mhp_restrictions { | |
62 | unsigned long flags; | |
63 | struct vmem_altmap *altmap; | |
64 | }; | |
65 | ||
bdc8cb98 DH |
66 | /* |
67 | * Zone resizing functions | |
511c2aba LJ |
68 | * |
69 | * Note: any attempt to resize a zone should has pgdat_resize_lock() | |
70 | * zone_span_writelock() both held. This ensure the size of a zone | |
71 | * can't be changed while pgdat_resize_lock() held. | |
bdc8cb98 DH |
72 | */ |
73 | static inline unsigned zone_span_seqbegin(struct zone *zone) | |
74 | { | |
75 | return read_seqbegin(&zone->span_seqlock); | |
76 | } | |
77 | static inline int zone_span_seqretry(struct zone *zone, unsigned iv) | |
78 | { | |
79 | return read_seqretry(&zone->span_seqlock, iv); | |
80 | } | |
81 | static inline void zone_span_writelock(struct zone *zone) | |
82 | { | |
83 | write_seqlock(&zone->span_seqlock); | |
84 | } | |
85 | static inline void zone_span_writeunlock(struct zone *zone) | |
86 | { | |
87 | write_sequnlock(&zone->span_seqlock); | |
88 | } | |
89 | static inline void zone_seqlock_init(struct zone *zone) | |
90 | { | |
91 | seqlock_init(&zone->span_seqlock); | |
92 | } | |
3947be19 DH |
93 | extern int zone_grow_free_lists(struct zone *zone, unsigned long new_nr_pages); |
94 | extern int zone_grow_waitqueues(struct zone *zone, unsigned long nr_pages); | |
95 | extern int add_one_highpage(struct page *page, int pfn, int bad_ppro); | |
3947be19 | 96 | /* VM interface that may be used by firmware interface */ |
511c2aba | 97 | extern int online_pages(unsigned long, unsigned long, int); |
a96dfddb TK |
98 | extern int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn, |
99 | unsigned long *valid_start, unsigned long *valid_end); | |
5557c766 MH |
100 | extern unsigned long __offline_isolated_pages(unsigned long start_pfn, |
101 | unsigned long end_pfn); | |
48e94196 | 102 | |
a9cd410a | 103 | typedef void (*online_page_callback_t)(struct page *page, unsigned int order); |
9d0ad8ca DK |
104 | |
105 | extern int set_online_page_callback(online_page_callback_t callback); | |
106 | extern int restore_online_page_callback(online_page_callback_t callback); | |
107 | ||
108 | extern void __online_page_set_limits(struct page *page); | |
109 | extern void __online_page_increment_counters(struct page *page); | |
110 | extern void __online_page_free(struct page *page); | |
111 | ||
01b0f197 TK |
112 | extern int try_online_node(int nid); |
113 | ||
940519f0 MH |
114 | extern int arch_add_memory(int nid, u64 start, u64 size, |
115 | struct mhp_restrictions *restrictions); | |
357b4da5 JG |
116 | extern u64 max_mem_size; |
117 | ||
31bc3858 | 118 | extern bool memhp_auto_online; |
4932381e MH |
119 | /* If movable_node boot option specified */ |
120 | extern bool movable_node_enabled; | |
121 | static inline bool movable_node_is_enabled(void) | |
122 | { | |
123 | return movable_node_enabled; | |
124 | } | |
31bc3858 | 125 | |
49ac8255 | 126 | #ifdef CONFIG_MEMORY_HOTREMOVE |
ac5c9426 DH |
127 | extern void arch_remove_memory(int nid, u64 start, u64 size, |
128 | struct vmem_altmap *altmap); | |
129 | extern void __remove_pages(struct zone *zone, unsigned long start_pfn, | |
130 | unsigned long nr_pages, struct vmem_altmap *altmap); | |
49ac8255 KH |
131 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
132 | ||
940519f0 MH |
133 | /* |
134 | * Do we want sysfs memblock files created. This will allow userspace to online | |
135 | * and offline memory explicitly. Lack of this bit means that the caller has to | |
136 | * call move_pfn_range_to_zone to finish the initialization. | |
137 | */ | |
138 | ||
139 | #define MHP_MEMBLOCK_API (1<<0) | |
140 | ||
f1dd2cd1 | 141 | /* reasonably generic interface to expand the physical pages */ |
24e6d5a5 | 142 | extern int __add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages, |
940519f0 | 143 | struct mhp_restrictions *restrictions); |
bc02af93 | 144 | |
3072e413 MH |
145 | #ifndef CONFIG_ARCH_HAS_ADD_PAGES |
146 | static inline int add_pages(int nid, unsigned long start_pfn, | |
940519f0 | 147 | unsigned long nr_pages, struct mhp_restrictions *restrictions) |
3072e413 | 148 | { |
940519f0 | 149 | return __add_pages(nid, start_pfn, nr_pages, restrictions); |
3072e413 MH |
150 | } |
151 | #else /* ARCH_HAS_ADD_PAGES */ | |
24e6d5a5 | 152 | int add_pages(int nid, unsigned long start_pfn, unsigned long nr_pages, |
940519f0 | 153 | struct mhp_restrictions *restrictions); |
3072e413 MH |
154 | #endif /* ARCH_HAS_ADD_PAGES */ |
155 | ||
bc02af93 YG |
156 | #ifdef CONFIG_NUMA |
157 | extern int memory_add_physaddr_to_nid(u64 start); | |
158 | #else | |
159 | static inline int memory_add_physaddr_to_nid(u64 start) | |
160 | { | |
161 | return 0; | |
162 | } | |
163 | #endif | |
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 | ||
d883c6cf JK |
242 | extern void set_zone_contiguous(struct zone *zone); |
243 | extern void clear_zone_contiguous(struct zone *zone); | |
244 | ||
208d54e5 | 245 | #else /* ! CONFIG_MEMORY_HOTPLUG */ |
2d070eab MH |
246 | #define pfn_to_online_page(pfn) \ |
247 | ({ \ | |
248 | struct page *___page = NULL; \ | |
249 | if (pfn_valid(pfn)) \ | |
250 | ___page = pfn_to_page(pfn); \ | |
251 | ___page; \ | |
252 | }) | |
253 | ||
bdc8cb98 DH |
254 | static inline unsigned zone_span_seqbegin(struct zone *zone) |
255 | { | |
256 | return 0; | |
257 | } | |
258 | static inline int zone_span_seqretry(struct zone *zone, unsigned iv) | |
259 | { | |
260 | return 0; | |
261 | } | |
262 | static inline void zone_span_writelock(struct zone *zone) {} | |
263 | static inline void zone_span_writeunlock(struct zone *zone) {} | |
264 | static inline void zone_seqlock_init(struct zone *zone) {} | |
3947be19 DH |
265 | |
266 | static inline int mhp_notimplemented(const char *func) | |
267 | { | |
268 | printk(KERN_WARNING "%s() called, with CONFIG_MEMORY_HOTPLUG disabled\n", func); | |
269 | dump_stack(); | |
270 | return -ENOSYS; | |
271 | } | |
272 | ||
04753278 YG |
273 | static inline void register_page_bootmem_info_node(struct pglist_data *pgdat) |
274 | { | |
275 | } | |
276 | ||
01b0f197 TK |
277 | static inline int try_online_node(int nid) |
278 | { | |
279 | return 0; | |
280 | } | |
281 | ||
bfc8c901 VD |
282 | static inline void get_online_mems(void) {} |
283 | static inline void put_online_mems(void) {} | |
20d6c96b | 284 | |
30467e0b DR |
285 | static inline void mem_hotplug_begin(void) {} |
286 | static inline void mem_hotplug_done(void) {} | |
287 | ||
4932381e MH |
288 | static inline bool movable_node_is_enabled(void) |
289 | { | |
290 | return false; | |
291 | } | |
bdc8cb98 | 292 | #endif /* ! CONFIG_MEMORY_HOTPLUG */ |
9d99aaa3 | 293 | |
3a2d7fa8 PT |
294 | #if defined(CONFIG_MEMORY_HOTPLUG) || defined(CONFIG_DEFERRED_STRUCT_PAGE_INIT) |
295 | /* | |
296 | * pgdat resizing functions | |
297 | */ | |
298 | static inline | |
299 | void pgdat_resize_lock(struct pglist_data *pgdat, unsigned long *flags) | |
300 | { | |
301 | spin_lock_irqsave(&pgdat->node_size_lock, *flags); | |
302 | } | |
303 | static inline | |
304 | void pgdat_resize_unlock(struct pglist_data *pgdat, unsigned long *flags) | |
305 | { | |
306 | spin_unlock_irqrestore(&pgdat->node_size_lock, *flags); | |
307 | } | |
308 | static inline | |
309 | void pgdat_resize_init(struct pglist_data *pgdat) | |
310 | { | |
311 | spin_lock_init(&pgdat->node_size_lock); | |
312 | } | |
313 | #else /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */ | |
314 | /* | |
315 | * Stub functions for when hotplug is off | |
316 | */ | |
317 | static inline void pgdat_resize_lock(struct pglist_data *p, unsigned long *f) {} | |
318 | static inline void pgdat_resize_unlock(struct pglist_data *p, unsigned long *f) {} | |
319 | static inline void pgdat_resize_init(struct pglist_data *pgdat) {} | |
320 | #endif /* !(CONFIG_MEMORY_HOTPLUG || CONFIG_DEFERRED_STRUCT_PAGE_INIT) */ | |
321 | ||
5c755e9f BP |
322 | #ifdef CONFIG_MEMORY_HOTREMOVE |
323 | ||
c98940f6 | 324 | extern bool is_mem_section_removable(unsigned long pfn, unsigned long nr_pages); |
90b30cdc | 325 | extern void try_offline_node(int nid); |
aba6efc4 RW |
326 | extern int offline_pages(unsigned long start_pfn, unsigned long nr_pages); |
327 | extern void remove_memory(int nid, u64 start, u64 size); | |
d15e5926 | 328 | extern void __remove_memory(int nid, u64 start, u64 size); |
5c755e9f BP |
329 | |
330 | #else | |
c98940f6 | 331 | static inline bool is_mem_section_removable(unsigned long pfn, |
5c755e9f BP |
332 | unsigned long nr_pages) |
333 | { | |
c98940f6 | 334 | return false; |
5c755e9f | 335 | } |
90b30cdc WC |
336 | |
337 | static inline void try_offline_node(int nid) {} | |
aba6efc4 RW |
338 | |
339 | static inline int offline_pages(unsigned long start_pfn, unsigned long nr_pages) | |
340 | { | |
341 | return -EINVAL; | |
342 | } | |
343 | ||
344 | static inline void remove_memory(int nid, u64 start, u64 size) {} | |
d15e5926 | 345 | static inline void __remove_memory(int nid, u64 start, u64 size) {} |
5c755e9f BP |
346 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
347 | ||
03e85f9d | 348 | extern void __ref free_area_init_core_hotplug(int nid); |
e2ff3940 RW |
349 | extern int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn, |
350 | void *arg, int (*func)(struct memory_block *, void *)); | |
8df1d0e4 | 351 | extern int __add_memory(int nid, u64 start, u64 size); |
bc02af93 | 352 | extern int add_memory(int nid, u64 start, u64 size); |
f29d8e9c | 353 | extern int add_memory_resource(int nid, struct resource *resource); |
f1dd2cd1 | 354 | extern void move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn, |
a99583e7 | 355 | unsigned long nr_pages, struct vmem_altmap *altmap); |
6677e3ea | 356 | extern bool is_memblock_offlined(struct memory_block *mem); |
4e0d2e7e WY |
357 | extern int sparse_add_one_section(int nid, unsigned long start_pfn, |
358 | struct vmem_altmap *altmap); | |
4b94ffdc | 359 | extern void sparse_remove_one_section(struct zone *zone, struct mem_section *ms, |
24b6d416 | 360 | unsigned long map_offset, struct vmem_altmap *altmap); |
04753278 YG |
361 | extern struct page *sparse_decode_mem_map(unsigned long coded_mem_map, |
362 | unsigned long pnum); | |
f1dd2cd1 MH |
363 | extern bool allow_online_pfn_range(int nid, unsigned long pfn, unsigned long nr_pages, |
364 | int online_type); | |
e5e68930 | 365 | extern struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn, |
c246a213 | 366 | unsigned long nr_pages); |
208d54e5 | 367 | #endif /* __LINUX_MEMORY_HOTPLUG_H */ |