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457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
3947be19 DH |
2 | /* |
3 | * linux/mm/memory_hotplug.c | |
4 | * | |
5 | * Copyright (C) | |
6 | */ | |
7 | ||
3947be19 DH |
8 | #include <linux/stddef.h> |
9 | #include <linux/mm.h> | |
174cd4b1 | 10 | #include <linux/sched/signal.h> |
3947be19 DH |
11 | #include <linux/swap.h> |
12 | #include <linux/interrupt.h> | |
13 | #include <linux/pagemap.h> | |
3947be19 | 14 | #include <linux/compiler.h> |
b95f1b31 | 15 | #include <linux/export.h> |
3947be19 | 16 | #include <linux/pagevec.h> |
2d1d43f6 | 17 | #include <linux/writeback.h> |
3947be19 DH |
18 | #include <linux/slab.h> |
19 | #include <linux/sysctl.h> | |
20 | #include <linux/cpu.h> | |
21 | #include <linux/memory.h> | |
4b94ffdc | 22 | #include <linux/memremap.h> |
3947be19 DH |
23 | #include <linux/memory_hotplug.h> |
24 | #include <linux/highmem.h> | |
25 | #include <linux/vmalloc.h> | |
0a547039 | 26 | #include <linux/ioport.h> |
0c0e6195 KH |
27 | #include <linux/delay.h> |
28 | #include <linux/migrate.h> | |
29 | #include <linux/page-isolation.h> | |
71088785 | 30 | #include <linux/pfn.h> |
6ad696d2 | 31 | #include <linux/suspend.h> |
6d9c285a | 32 | #include <linux/mm_inline.h> |
d96ae530 | 33 | #include <linux/firmware-map.h> |
60a5a19e | 34 | #include <linux/stop_machine.h> |
c8721bbb | 35 | #include <linux/hugetlb.h> |
c5320926 | 36 | #include <linux/memblock.h> |
698b1b30 | 37 | #include <linux/compaction.h> |
b15c8726 | 38 | #include <linux/rmap.h> |
3947be19 DH |
39 | |
40 | #include <asm/tlbflush.h> | |
41 | ||
1e5ad9a3 | 42 | #include "internal.h" |
e900a918 | 43 | #include "shuffle.h" |
1e5ad9a3 | 44 | |
e3a9d9fc OS |
45 | |
46 | /* | |
47 | * memory_hotplug.memmap_on_memory parameter | |
48 | */ | |
49 | static bool memmap_on_memory __ro_after_init; | |
50 | #ifdef CONFIG_MHP_MEMMAP_ON_MEMORY | |
51 | module_param(memmap_on_memory, bool, 0444); | |
52 | MODULE_PARM_DESC(memmap_on_memory, "Enable memmap on memory for memory hotplug"); | |
53 | #endif | |
a08a2ae3 | 54 | |
9d0ad8ca DK |
55 | /* |
56 | * online_page_callback contains pointer to current page onlining function. | |
57 | * Initially it is generic_online_page(). If it is required it could be | |
58 | * changed by calling set_online_page_callback() for callback registration | |
59 | * and restore_online_page_callback() for generic callback restore. | |
60 | */ | |
61 | ||
9d0ad8ca | 62 | static online_page_callback_t online_page_callback = generic_online_page; |
bfc8c901 | 63 | static DEFINE_MUTEX(online_page_callback_lock); |
9d0ad8ca | 64 | |
3f906ba2 | 65 | DEFINE_STATIC_PERCPU_RWSEM(mem_hotplug_lock); |
bfc8c901 | 66 | |
3f906ba2 TG |
67 | void get_online_mems(void) |
68 | { | |
69 | percpu_down_read(&mem_hotplug_lock); | |
70 | } | |
bfc8c901 | 71 | |
3f906ba2 TG |
72 | void put_online_mems(void) |
73 | { | |
74 | percpu_up_read(&mem_hotplug_lock); | |
75 | } | |
bfc8c901 | 76 | |
4932381e MH |
77 | bool movable_node_enabled = false; |
78 | ||
8604d9e5 | 79 | #ifndef CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE |
1adf8b46 | 80 | int mhp_default_online_type = MMOP_OFFLINE; |
8604d9e5 | 81 | #else |
1adf8b46 | 82 | int mhp_default_online_type = MMOP_ONLINE; |
8604d9e5 | 83 | #endif |
31bc3858 | 84 | |
86dd995d VK |
85 | static int __init setup_memhp_default_state(char *str) |
86 | { | |
1adf8b46 | 87 | const int online_type = mhp_online_type_from_str(str); |
5f47adf7 DH |
88 | |
89 | if (online_type >= 0) | |
1adf8b46 | 90 | mhp_default_online_type = online_type; |
86dd995d VK |
91 | |
92 | return 1; | |
93 | } | |
94 | __setup("memhp_default_state=", setup_memhp_default_state); | |
95 | ||
30467e0b | 96 | void mem_hotplug_begin(void) |
20d6c96b | 97 | { |
3f906ba2 TG |
98 | cpus_read_lock(); |
99 | percpu_down_write(&mem_hotplug_lock); | |
20d6c96b KM |
100 | } |
101 | ||
30467e0b | 102 | void mem_hotplug_done(void) |
bfc8c901 | 103 | { |
3f906ba2 TG |
104 | percpu_up_write(&mem_hotplug_lock); |
105 | cpus_read_unlock(); | |
bfc8c901 | 106 | } |
20d6c96b | 107 | |
357b4da5 JG |
108 | u64 max_mem_size = U64_MAX; |
109 | ||
45e0b78b | 110 | /* add this memory to iomem resource */ |
7b7b2721 DH |
111 | static struct resource *register_memory_resource(u64 start, u64 size, |
112 | const char *resource_name) | |
45e0b78b | 113 | { |
2794129e DH |
114 | struct resource *res; |
115 | unsigned long flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; | |
7b7b2721 DH |
116 | |
117 | if (strcmp(resource_name, "System RAM")) | |
7cf603d1 | 118 | flags |= IORESOURCE_SYSRAM_DRIVER_MANAGED; |
357b4da5 | 119 | |
bca3feaa AK |
120 | if (!mhp_range_allowed(start, size, true)) |
121 | return ERR_PTR(-E2BIG); | |
122 | ||
f3cd4c86 BH |
123 | /* |
124 | * Make sure value parsed from 'mem=' only restricts memory adding | |
125 | * while booting, so that memory hotplug won't be impacted. Please | |
126 | * refer to document of 'mem=' in kernel-parameters.txt for more | |
127 | * details. | |
128 | */ | |
129 | if (start + size > max_mem_size && system_state < SYSTEM_RUNNING) | |
357b4da5 JG |
130 | return ERR_PTR(-E2BIG); |
131 | ||
2794129e DH |
132 | /* |
133 | * Request ownership of the new memory range. This might be | |
134 | * a child of an existing resource that was present but | |
135 | * not marked as busy. | |
136 | */ | |
137 | res = __request_region(&iomem_resource, start, size, | |
138 | resource_name, flags); | |
139 | ||
140 | if (!res) { | |
141 | pr_debug("Unable to reserve System RAM region: %016llx->%016llx\n", | |
142 | start, start + size); | |
6f754ba4 | 143 | return ERR_PTR(-EEXIST); |
45e0b78b KM |
144 | } |
145 | return res; | |
146 | } | |
147 | ||
148 | static void release_memory_resource(struct resource *res) | |
149 | { | |
150 | if (!res) | |
151 | return; | |
152 | release_resource(res); | |
153 | kfree(res); | |
45e0b78b KM |
154 | } |
155 | ||
53947027 | 156 | #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE |
7ea62160 DW |
157 | static int check_pfn_span(unsigned long pfn, unsigned long nr_pages, |
158 | const char *reason) | |
159 | { | |
160 | /* | |
161 | * Disallow all operations smaller than a sub-section and only | |
162 | * allow operations smaller than a section for | |
163 | * SPARSEMEM_VMEMMAP. Note that check_hotplug_memory_range() | |
164 | * enforces a larger memory_block_size_bytes() granularity for | |
165 | * memory that will be marked online, so this check should only | |
166 | * fire for direct arch_{add,remove}_memory() users outside of | |
167 | * add_memory_resource(). | |
168 | */ | |
169 | unsigned long min_align; | |
170 | ||
171 | if (IS_ENABLED(CONFIG_SPARSEMEM_VMEMMAP)) | |
172 | min_align = PAGES_PER_SUBSECTION; | |
173 | else | |
174 | min_align = PAGES_PER_SECTION; | |
175 | if (!IS_ALIGNED(pfn, min_align) | |
176 | || !IS_ALIGNED(nr_pages, min_align)) { | |
177 | WARN(1, "Misaligned __%s_pages start: %#lx end: #%lx\n", | |
178 | reason, pfn, pfn + nr_pages - 1); | |
179 | return -EINVAL; | |
180 | } | |
181 | return 0; | |
182 | } | |
183 | ||
9f605f26 DW |
184 | /* |
185 | * Return page for the valid pfn only if the page is online. All pfn | |
186 | * walkers which rely on the fully initialized page->flags and others | |
187 | * should use this rather than pfn_valid && pfn_to_page | |
188 | */ | |
189 | struct page *pfn_to_online_page(unsigned long pfn) | |
190 | { | |
191 | unsigned long nr = pfn_to_section_nr(pfn); | |
1f90a347 | 192 | struct dev_pagemap *pgmap; |
9f9b02e5 DW |
193 | struct mem_section *ms; |
194 | ||
195 | if (nr >= NR_MEM_SECTIONS) | |
196 | return NULL; | |
197 | ||
198 | ms = __nr_to_section(nr); | |
199 | if (!online_section(ms)) | |
200 | return NULL; | |
201 | ||
202 | /* | |
203 | * Save some code text when online_section() + | |
204 | * pfn_section_valid() are sufficient. | |
205 | */ | |
206 | if (IS_ENABLED(CONFIG_HAVE_ARCH_PFN_VALID) && !pfn_valid(pfn)) | |
207 | return NULL; | |
208 | ||
209 | if (!pfn_section_valid(ms, pfn)) | |
210 | return NULL; | |
9f605f26 | 211 | |
1f90a347 DW |
212 | if (!online_device_section(ms)) |
213 | return pfn_to_page(pfn); | |
214 | ||
215 | /* | |
216 | * Slowpath: when ZONE_DEVICE collides with | |
217 | * ZONE_{NORMAL,MOVABLE} within the same section some pfns in | |
218 | * the section may be 'offline' but 'valid'. Only | |
219 | * get_dev_pagemap() can determine sub-section online status. | |
220 | */ | |
221 | pgmap = get_dev_pagemap(pfn, NULL); | |
222 | put_dev_pagemap(pgmap); | |
223 | ||
224 | /* The presence of a pgmap indicates ZONE_DEVICE offline pfn */ | |
225 | if (pgmap) | |
226 | return NULL; | |
227 | ||
9f9b02e5 | 228 | return pfn_to_page(pfn); |
9f605f26 DW |
229 | } |
230 | EXPORT_SYMBOL_GPL(pfn_to_online_page); | |
231 | ||
4edd7cef DR |
232 | /* |
233 | * Reasonably generic function for adding memory. It is | |
234 | * expected that archs that support memory hotplug will | |
235 | * call this function after deciding the zone to which to | |
236 | * add the new pages. | |
237 | */ | |
7ea62160 | 238 | int __ref __add_pages(int nid, unsigned long pfn, unsigned long nr_pages, |
f5637d3b | 239 | struct mhp_params *params) |
4edd7cef | 240 | { |
6cdd0b30 DH |
241 | const unsigned long end_pfn = pfn + nr_pages; |
242 | unsigned long cur_nr_pages; | |
9a845030 | 243 | int err; |
f5637d3b | 244 | struct vmem_altmap *altmap = params->altmap; |
4b94ffdc | 245 | |
bfeb022f LG |
246 | if (WARN_ON_ONCE(!params->pgprot.pgprot)) |
247 | return -EINVAL; | |
248 | ||
bca3feaa | 249 | VM_BUG_ON(!mhp_range_allowed(PFN_PHYS(pfn), nr_pages * PAGE_SIZE, false)); |
dca4436d | 250 | |
4b94ffdc DW |
251 | if (altmap) { |
252 | /* | |
253 | * Validate altmap is within bounds of the total request | |
254 | */ | |
7ea62160 | 255 | if (altmap->base_pfn != pfn |
4b94ffdc DW |
256 | || vmem_altmap_offset(altmap) > nr_pages) { |
257 | pr_warn_once("memory add fail, invalid altmap\n"); | |
7ea62160 | 258 | return -EINVAL; |
4b94ffdc DW |
259 | } |
260 | altmap->alloc = 0; | |
261 | } | |
262 | ||
7ea62160 DW |
263 | err = check_pfn_span(pfn, nr_pages, "add"); |
264 | if (err) | |
265 | return err; | |
266 | ||
6cdd0b30 DH |
267 | for (; pfn < end_pfn; pfn += cur_nr_pages) { |
268 | /* Select all remaining pages up to the next section boundary */ | |
269 | cur_nr_pages = min(end_pfn - pfn, | |
270 | SECTION_ALIGN_UP(pfn + 1) - pfn); | |
271 | err = sparse_add_section(nid, pfn, cur_nr_pages, altmap); | |
ba72b4c8 DW |
272 | if (err) |
273 | break; | |
f64ac5e6 | 274 | cond_resched(); |
4edd7cef | 275 | } |
c435a390 | 276 | vmemmap_populate_print_last(); |
4edd7cef DR |
277 | return err; |
278 | } | |
4edd7cef | 279 | |
815121d2 | 280 | /* find the smallest valid pfn in the range [start_pfn, end_pfn) */ |
d09b0137 | 281 | static unsigned long find_smallest_section_pfn(int nid, struct zone *zone, |
815121d2 YI |
282 | unsigned long start_pfn, |
283 | unsigned long end_pfn) | |
284 | { | |
49ba3c6b | 285 | for (; start_pfn < end_pfn; start_pfn += PAGES_PER_SUBSECTION) { |
7ce700bf | 286 | if (unlikely(!pfn_to_online_page(start_pfn))) |
815121d2 YI |
287 | continue; |
288 | ||
289 | if (unlikely(pfn_to_nid(start_pfn) != nid)) | |
290 | continue; | |
291 | ||
9b05158f | 292 | if (zone != page_zone(pfn_to_page(start_pfn))) |
815121d2 YI |
293 | continue; |
294 | ||
295 | return start_pfn; | |
296 | } | |
297 | ||
298 | return 0; | |
299 | } | |
300 | ||
301 | /* find the biggest valid pfn in the range [start_pfn, end_pfn). */ | |
d09b0137 | 302 | static unsigned long find_biggest_section_pfn(int nid, struct zone *zone, |
815121d2 YI |
303 | unsigned long start_pfn, |
304 | unsigned long end_pfn) | |
305 | { | |
815121d2 YI |
306 | unsigned long pfn; |
307 | ||
308 | /* pfn is the end pfn of a memory section. */ | |
309 | pfn = end_pfn - 1; | |
49ba3c6b | 310 | for (; pfn >= start_pfn; pfn -= PAGES_PER_SUBSECTION) { |
7ce700bf | 311 | if (unlikely(!pfn_to_online_page(pfn))) |
815121d2 YI |
312 | continue; |
313 | ||
314 | if (unlikely(pfn_to_nid(pfn) != nid)) | |
315 | continue; | |
316 | ||
9b05158f | 317 | if (zone != page_zone(pfn_to_page(pfn))) |
815121d2 YI |
318 | continue; |
319 | ||
320 | return pfn; | |
321 | } | |
322 | ||
323 | return 0; | |
324 | } | |
325 | ||
326 | static void shrink_zone_span(struct zone *zone, unsigned long start_pfn, | |
327 | unsigned long end_pfn) | |
328 | { | |
815121d2 | 329 | unsigned long pfn; |
815121d2 YI |
330 | int nid = zone_to_nid(zone); |
331 | ||
332 | zone_span_writelock(zone); | |
5d12071c | 333 | if (zone->zone_start_pfn == start_pfn) { |
815121d2 YI |
334 | /* |
335 | * If the section is smallest section in the zone, it need | |
336 | * shrink zone->zone_start_pfn and zone->zone_spanned_pages. | |
337 | * In this case, we find second smallest valid mem_section | |
338 | * for shrinking zone. | |
339 | */ | |
340 | pfn = find_smallest_section_pfn(nid, zone, end_pfn, | |
5d12071c | 341 | zone_end_pfn(zone)); |
815121d2 | 342 | if (pfn) { |
5d12071c | 343 | zone->spanned_pages = zone_end_pfn(zone) - pfn; |
815121d2 | 344 | zone->zone_start_pfn = pfn; |
950b68d9 DH |
345 | } else { |
346 | zone->zone_start_pfn = 0; | |
347 | zone->spanned_pages = 0; | |
815121d2 | 348 | } |
5d12071c | 349 | } else if (zone_end_pfn(zone) == end_pfn) { |
815121d2 YI |
350 | /* |
351 | * If the section is biggest section in the zone, it need | |
352 | * shrink zone->spanned_pages. | |
353 | * In this case, we find second biggest valid mem_section for | |
354 | * shrinking zone. | |
355 | */ | |
5d12071c | 356 | pfn = find_biggest_section_pfn(nid, zone, zone->zone_start_pfn, |
815121d2 YI |
357 | start_pfn); |
358 | if (pfn) | |
5d12071c | 359 | zone->spanned_pages = pfn - zone->zone_start_pfn + 1; |
950b68d9 DH |
360 | else { |
361 | zone->zone_start_pfn = 0; | |
362 | zone->spanned_pages = 0; | |
363 | } | |
815121d2 | 364 | } |
815121d2 YI |
365 | zone_span_writeunlock(zone); |
366 | } | |
367 | ||
00d6c019 | 368 | static void update_pgdat_span(struct pglist_data *pgdat) |
815121d2 | 369 | { |
00d6c019 DH |
370 | unsigned long node_start_pfn = 0, node_end_pfn = 0; |
371 | struct zone *zone; | |
372 | ||
373 | for (zone = pgdat->node_zones; | |
374 | zone < pgdat->node_zones + MAX_NR_ZONES; zone++) { | |
6c922cf7 | 375 | unsigned long end_pfn = zone_end_pfn(zone); |
00d6c019 DH |
376 | |
377 | /* No need to lock the zones, they can't change. */ | |
656d5711 DH |
378 | if (!zone->spanned_pages) |
379 | continue; | |
380 | if (!node_end_pfn) { | |
381 | node_start_pfn = zone->zone_start_pfn; | |
6c922cf7 | 382 | node_end_pfn = end_pfn; |
656d5711 DH |
383 | continue; |
384 | } | |
385 | ||
6c922cf7 ML |
386 | if (end_pfn > node_end_pfn) |
387 | node_end_pfn = end_pfn; | |
00d6c019 DH |
388 | if (zone->zone_start_pfn < node_start_pfn) |
389 | node_start_pfn = zone->zone_start_pfn; | |
815121d2 YI |
390 | } |
391 | ||
00d6c019 DH |
392 | pgdat->node_start_pfn = node_start_pfn; |
393 | pgdat->node_spanned_pages = node_end_pfn - node_start_pfn; | |
815121d2 YI |
394 | } |
395 | ||
feee6b29 DH |
396 | void __ref remove_pfn_range_from_zone(struct zone *zone, |
397 | unsigned long start_pfn, | |
398 | unsigned long nr_pages) | |
815121d2 | 399 | { |
b7e3debd | 400 | const unsigned long end_pfn = start_pfn + nr_pages; |
815121d2 | 401 | struct pglist_data *pgdat = zone->zone_pgdat; |
b7e3debd | 402 | unsigned long pfn, cur_nr_pages, flags; |
815121d2 | 403 | |
d33695b1 | 404 | /* Poison struct pages because they are now uninitialized again. */ |
b7e3debd BW |
405 | for (pfn = start_pfn; pfn < end_pfn; pfn += cur_nr_pages) { |
406 | cond_resched(); | |
407 | ||
408 | /* Select all remaining pages up to the next section boundary */ | |
409 | cur_nr_pages = | |
410 | min(end_pfn - pfn, SECTION_ALIGN_UP(pfn + 1) - pfn); | |
411 | page_init_poison(pfn_to_page(pfn), | |
412 | sizeof(struct page) * cur_nr_pages); | |
413 | } | |
d33695b1 | 414 | |
7ce700bf DH |
415 | #ifdef CONFIG_ZONE_DEVICE |
416 | /* | |
417 | * Zone shrinking code cannot properly deal with ZONE_DEVICE. So | |
418 | * we will not try to shrink the zones - which is okay as | |
419 | * set_zone_contiguous() cannot deal with ZONE_DEVICE either way. | |
420 | */ | |
421 | if (zone_idx(zone) == ZONE_DEVICE) | |
422 | return; | |
423 | #endif | |
424 | ||
feee6b29 DH |
425 | clear_zone_contiguous(zone); |
426 | ||
815121d2 YI |
427 | pgdat_resize_lock(zone->zone_pgdat, &flags); |
428 | shrink_zone_span(zone, start_pfn, start_pfn + nr_pages); | |
00d6c019 | 429 | update_pgdat_span(pgdat); |
815121d2 | 430 | pgdat_resize_unlock(zone->zone_pgdat, &flags); |
feee6b29 DH |
431 | |
432 | set_zone_contiguous(zone); | |
815121d2 YI |
433 | } |
434 | ||
feee6b29 DH |
435 | static void __remove_section(unsigned long pfn, unsigned long nr_pages, |
436 | unsigned long map_offset, | |
437 | struct vmem_altmap *altmap) | |
ea01ea93 | 438 | { |
10404901 | 439 | struct mem_section *ms = __pfn_to_section(pfn); |
ea01ea93 | 440 | |
9d1d887d DH |
441 | if (WARN_ON_ONCE(!valid_section(ms))) |
442 | return; | |
ea01ea93 | 443 | |
ba72b4c8 | 444 | sparse_remove_section(ms, pfn, nr_pages, map_offset, altmap); |
ea01ea93 BP |
445 | } |
446 | ||
ea01ea93 | 447 | /** |
feee6b29 | 448 | * __remove_pages() - remove sections of pages |
7ea62160 | 449 | * @pfn: starting pageframe (must be aligned to start of a section) |
ea01ea93 | 450 | * @nr_pages: number of pages to remove (must be multiple of section size) |
e8b098fc | 451 | * @altmap: alternative device page map or %NULL if default memmap is used |
ea01ea93 BP |
452 | * |
453 | * Generic helper function to remove section mappings and sysfs entries | |
454 | * for the section of the memory we are removing. Caller needs to make | |
455 | * sure that pages are marked reserved and zones are adjust properly by | |
456 | * calling offline_pages(). | |
457 | */ | |
feee6b29 DH |
458 | void __remove_pages(unsigned long pfn, unsigned long nr_pages, |
459 | struct vmem_altmap *altmap) | |
ea01ea93 | 460 | { |
52fb87c8 DH |
461 | const unsigned long end_pfn = pfn + nr_pages; |
462 | unsigned long cur_nr_pages; | |
4b94ffdc | 463 | unsigned long map_offset = 0; |
4b94ffdc | 464 | |
96da4350 | 465 | map_offset = vmem_altmap_offset(altmap); |
ea01ea93 | 466 | |
7ea62160 DW |
467 | if (check_pfn_span(pfn, nr_pages, "remove")) |
468 | return; | |
ea01ea93 | 469 | |
52fb87c8 | 470 | for (; pfn < end_pfn; pfn += cur_nr_pages) { |
dd33ad7b | 471 | cond_resched(); |
52fb87c8 | 472 | /* Select all remaining pages up to the next section boundary */ |
a11b9419 DH |
473 | cur_nr_pages = min(end_pfn - pfn, |
474 | SECTION_ALIGN_UP(pfn + 1) - pfn); | |
52fb87c8 | 475 | __remove_section(pfn, cur_nr_pages, map_offset, altmap); |
4b94ffdc | 476 | map_offset = 0; |
ea01ea93 | 477 | } |
ea01ea93 | 478 | } |
ea01ea93 | 479 | |
9d0ad8ca DK |
480 | int set_online_page_callback(online_page_callback_t callback) |
481 | { | |
482 | int rc = -EINVAL; | |
483 | ||
bfc8c901 VD |
484 | get_online_mems(); |
485 | mutex_lock(&online_page_callback_lock); | |
9d0ad8ca DK |
486 | |
487 | if (online_page_callback == generic_online_page) { | |
488 | online_page_callback = callback; | |
489 | rc = 0; | |
490 | } | |
491 | ||
bfc8c901 VD |
492 | mutex_unlock(&online_page_callback_lock); |
493 | put_online_mems(); | |
9d0ad8ca DK |
494 | |
495 | return rc; | |
496 | } | |
497 | EXPORT_SYMBOL_GPL(set_online_page_callback); | |
498 | ||
499 | int restore_online_page_callback(online_page_callback_t callback) | |
500 | { | |
501 | int rc = -EINVAL; | |
502 | ||
bfc8c901 VD |
503 | get_online_mems(); |
504 | mutex_lock(&online_page_callback_lock); | |
9d0ad8ca DK |
505 | |
506 | if (online_page_callback == callback) { | |
507 | online_page_callback = generic_online_page; | |
508 | rc = 0; | |
509 | } | |
510 | ||
bfc8c901 VD |
511 | mutex_unlock(&online_page_callback_lock); |
512 | put_online_mems(); | |
9d0ad8ca DK |
513 | |
514 | return rc; | |
515 | } | |
516 | EXPORT_SYMBOL_GPL(restore_online_page_callback); | |
517 | ||
18db1491 | 518 | void generic_online_page(struct page *page, unsigned int order) |
9d0ad8ca | 519 | { |
c87cbc1f VB |
520 | /* |
521 | * Freeing the page with debug_pagealloc enabled will try to unmap it, | |
522 | * so we should map it first. This is better than introducing a special | |
523 | * case in page freeing fast path. | |
524 | */ | |
77bc7fd6 | 525 | debug_pagealloc_map_pages(page, 1 << order); |
a9cd410a AK |
526 | __free_pages_core(page, order); |
527 | totalram_pages_add(1UL << order); | |
528 | #ifdef CONFIG_HIGHMEM | |
529 | if (PageHighMem(page)) | |
530 | totalhigh_pages_add(1UL << order); | |
531 | #endif | |
532 | } | |
18db1491 | 533 | EXPORT_SYMBOL_GPL(generic_online_page); |
a9cd410a | 534 | |
aac65321 | 535 | static void online_pages_range(unsigned long start_pfn, unsigned long nr_pages) |
3947be19 | 536 | { |
b2c2ab20 DH |
537 | const unsigned long end_pfn = start_pfn + nr_pages; |
538 | unsigned long pfn; | |
b2c2ab20 DH |
539 | |
540 | /* | |
aac65321 DH |
541 | * Online the pages in MAX_ORDER - 1 aligned chunks. The callback might |
542 | * decide to not expose all pages to the buddy (e.g., expose them | |
543 | * later). We account all pages as being online and belonging to this | |
544 | * zone ("present"). | |
a08a2ae3 OS |
545 | * When using memmap_on_memory, the range might not be aligned to |
546 | * MAX_ORDER_NR_PAGES - 1, but pageblock aligned. __ffs() will detect | |
547 | * this and the first chunk to online will be pageblock_nr_pages. | |
b2c2ab20 | 548 | */ |
a08a2ae3 OS |
549 | for (pfn = start_pfn; pfn < end_pfn;) { |
550 | int order = min(MAX_ORDER - 1UL, __ffs(pfn)); | |
551 | ||
552 | (*online_page_callback)(pfn_to_page(pfn), order); | |
553 | pfn += (1UL << order); | |
554 | } | |
2d070eab | 555 | |
b2c2ab20 DH |
556 | /* mark all involved sections as online */ |
557 | online_mem_sections(start_pfn, end_pfn); | |
75884fb1 KH |
558 | } |
559 | ||
d9713679 LJ |
560 | /* check which state of node_states will be changed when online memory */ |
561 | static void node_states_check_changes_online(unsigned long nr_pages, | |
562 | struct zone *zone, struct memory_notify *arg) | |
563 | { | |
564 | int nid = zone_to_nid(zone); | |
d9713679 | 565 | |
98fa15f3 AK |
566 | arg->status_change_nid = NUMA_NO_NODE; |
567 | arg->status_change_nid_normal = NUMA_NO_NODE; | |
568 | arg->status_change_nid_high = NUMA_NO_NODE; | |
d9713679 | 569 | |
8efe33f4 OS |
570 | if (!node_state(nid, N_MEMORY)) |
571 | arg->status_change_nid = nid; | |
572 | if (zone_idx(zone) <= ZONE_NORMAL && !node_state(nid, N_NORMAL_MEMORY)) | |
d9713679 | 573 | arg->status_change_nid_normal = nid; |
6715ddf9 | 574 | #ifdef CONFIG_HIGHMEM |
d3ba3ae1 | 575 | if (zone_idx(zone) <= ZONE_HIGHMEM && !node_state(nid, N_HIGH_MEMORY)) |
6715ddf9 | 576 | arg->status_change_nid_high = nid; |
6715ddf9 | 577 | #endif |
d9713679 LJ |
578 | } |
579 | ||
580 | static void node_states_set_node(int node, struct memory_notify *arg) | |
581 | { | |
582 | if (arg->status_change_nid_normal >= 0) | |
583 | node_set_state(node, N_NORMAL_MEMORY); | |
584 | ||
6715ddf9 LJ |
585 | if (arg->status_change_nid_high >= 0) |
586 | node_set_state(node, N_HIGH_MEMORY); | |
587 | ||
83d83612 OS |
588 | if (arg->status_change_nid >= 0) |
589 | node_set_state(node, N_MEMORY); | |
d9713679 LJ |
590 | } |
591 | ||
f1dd2cd1 MH |
592 | static void __meminit resize_zone_range(struct zone *zone, unsigned long start_pfn, |
593 | unsigned long nr_pages) | |
594 | { | |
595 | unsigned long old_end_pfn = zone_end_pfn(zone); | |
596 | ||
597 | if (zone_is_empty(zone) || start_pfn < zone->zone_start_pfn) | |
598 | zone->zone_start_pfn = start_pfn; | |
599 | ||
600 | zone->spanned_pages = max(start_pfn + nr_pages, old_end_pfn) - zone->zone_start_pfn; | |
601 | } | |
602 | ||
603 | static void __meminit resize_pgdat_range(struct pglist_data *pgdat, unsigned long start_pfn, | |
604 | unsigned long nr_pages) | |
605 | { | |
606 | unsigned long old_end_pfn = pgdat_end_pfn(pgdat); | |
607 | ||
608 | if (!pgdat->node_spanned_pages || start_pfn < pgdat->node_start_pfn) | |
609 | pgdat->node_start_pfn = start_pfn; | |
610 | ||
611 | pgdat->node_spanned_pages = max(start_pfn + nr_pages, old_end_pfn) - pgdat->node_start_pfn; | |
f1dd2cd1 | 612 | |
3fccb74c | 613 | } |
1f90a347 DW |
614 | |
615 | static void section_taint_zone_device(unsigned long pfn) | |
616 | { | |
617 | struct mem_section *ms = __pfn_to_section(pfn); | |
618 | ||
619 | ms->section_mem_map |= SECTION_TAINT_ZONE_DEVICE; | |
620 | } | |
621 | ||
3fccb74c DH |
622 | /* |
623 | * Associate the pfn range with the given zone, initializing the memmaps | |
624 | * and resizing the pgdat/zone data to span the added pages. After this | |
625 | * call, all affected pages are PG_reserved. | |
d882c006 DH |
626 | * |
627 | * All aligned pageblocks are initialized to the specified migratetype | |
628 | * (usually MIGRATE_MOVABLE). Besides setting the migratetype, no related | |
629 | * zone stats (e.g., nr_isolate_pageblock) are touched. | |
3fccb74c | 630 | */ |
a99583e7 | 631 | void __ref move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn, |
d882c006 DH |
632 | unsigned long nr_pages, |
633 | struct vmem_altmap *altmap, int migratetype) | |
f1dd2cd1 MH |
634 | { |
635 | struct pglist_data *pgdat = zone->zone_pgdat; | |
636 | int nid = pgdat->node_id; | |
637 | unsigned long flags; | |
df429ac0 | 638 | |
f1dd2cd1 MH |
639 | clear_zone_contiguous(zone); |
640 | ||
641 | /* TODO Huh pgdat is irqsave while zone is not. It used to be like that before */ | |
642 | pgdat_resize_lock(pgdat, &flags); | |
643 | zone_span_writelock(zone); | |
fa004ab7 WY |
644 | if (zone_is_empty(zone)) |
645 | init_currently_empty_zone(zone, start_pfn, nr_pages); | |
f1dd2cd1 MH |
646 | resize_zone_range(zone, start_pfn, nr_pages); |
647 | zone_span_writeunlock(zone); | |
648 | resize_pgdat_range(pgdat, start_pfn, nr_pages); | |
649 | pgdat_resize_unlock(pgdat, &flags); | |
650 | ||
1f90a347 DW |
651 | /* |
652 | * Subsection population requires care in pfn_to_online_page(). | |
653 | * Set the taint to enable the slow path detection of | |
654 | * ZONE_DEVICE pages in an otherwise ZONE_{NORMAL,MOVABLE} | |
655 | * section. | |
656 | */ | |
657 | if (zone_is_zone_device(zone)) { | |
658 | if (!IS_ALIGNED(start_pfn, PAGES_PER_SECTION)) | |
659 | section_taint_zone_device(start_pfn); | |
660 | if (!IS_ALIGNED(start_pfn + nr_pages, PAGES_PER_SECTION)) | |
661 | section_taint_zone_device(start_pfn + nr_pages); | |
662 | } | |
663 | ||
f1dd2cd1 MH |
664 | /* |
665 | * TODO now we have a visible range of pages which are not associated | |
666 | * with their zone properly. Not nice but set_pfnblock_flags_mask | |
667 | * expects the zone spans the pfn range. All the pages in the range | |
668 | * are reserved so nobody should be touching them so we should be safe | |
669 | */ | |
ab28cb6e | 670 | memmap_init_range(nr_pages, nid, zone_idx(zone), start_pfn, 0, |
d882c006 | 671 | MEMINIT_HOTPLUG, altmap, migratetype); |
f1dd2cd1 MH |
672 | |
673 | set_zone_contiguous(zone); | |
674 | } | |
675 | ||
c246a213 MH |
676 | /* |
677 | * Returns a default kernel memory zone for the given pfn range. | |
678 | * If no kernel zone covers this pfn range it will automatically go | |
679 | * to the ZONE_NORMAL. | |
680 | */ | |
c6f03e29 | 681 | static struct zone *default_kernel_zone_for_pfn(int nid, unsigned long start_pfn, |
c246a213 MH |
682 | unsigned long nr_pages) |
683 | { | |
684 | struct pglist_data *pgdat = NODE_DATA(nid); | |
685 | int zid; | |
686 | ||
687 | for (zid = 0; zid <= ZONE_NORMAL; zid++) { | |
688 | struct zone *zone = &pgdat->node_zones[zid]; | |
689 | ||
690 | if (zone_intersects(zone, start_pfn, nr_pages)) | |
691 | return zone; | |
692 | } | |
693 | ||
694 | return &pgdat->node_zones[ZONE_NORMAL]; | |
695 | } | |
696 | ||
c6f03e29 MH |
697 | static inline struct zone *default_zone_for_pfn(int nid, unsigned long start_pfn, |
698 | unsigned long nr_pages) | |
e5e68930 | 699 | { |
c6f03e29 MH |
700 | struct zone *kernel_zone = default_kernel_zone_for_pfn(nid, start_pfn, |
701 | nr_pages); | |
702 | struct zone *movable_zone = &NODE_DATA(nid)->node_zones[ZONE_MOVABLE]; | |
703 | bool in_kernel = zone_intersects(kernel_zone, start_pfn, nr_pages); | |
704 | bool in_movable = zone_intersects(movable_zone, start_pfn, nr_pages); | |
e5e68930 MH |
705 | |
706 | /* | |
c6f03e29 MH |
707 | * We inherit the existing zone in a simple case where zones do not |
708 | * overlap in the given range | |
e5e68930 | 709 | */ |
c6f03e29 MH |
710 | if (in_kernel ^ in_movable) |
711 | return (in_kernel) ? kernel_zone : movable_zone; | |
9f123ab5 | 712 | |
c6f03e29 MH |
713 | /* |
714 | * If the range doesn't belong to any zone or two zones overlap in the | |
715 | * given range then we use movable zone only if movable_node is | |
716 | * enabled because we always online to a kernel zone by default. | |
717 | */ | |
718 | return movable_node_enabled ? movable_zone : kernel_zone; | |
9f123ab5 MH |
719 | } |
720 | ||
68d68ff6 | 721 | struct zone *zone_for_pfn_range(int online_type, int nid, unsigned start_pfn, |
e5e68930 | 722 | unsigned long nr_pages) |
f1dd2cd1 | 723 | { |
c6f03e29 MH |
724 | if (online_type == MMOP_ONLINE_KERNEL) |
725 | return default_kernel_zone_for_pfn(nid, start_pfn, nr_pages); | |
f1dd2cd1 | 726 | |
c6f03e29 MH |
727 | if (online_type == MMOP_ONLINE_MOVABLE) |
728 | return &NODE_DATA(nid)->node_zones[ZONE_MOVABLE]; | |
df429ac0 | 729 | |
c6f03e29 | 730 | return default_zone_for_pfn(nid, start_pfn, nr_pages); |
e5e68930 MH |
731 | } |
732 | ||
a08a2ae3 OS |
733 | /* |
734 | * This function should only be called by memory_block_{online,offline}, | |
735 | * and {online,offline}_pages. | |
736 | */ | |
737 | void adjust_present_page_count(struct zone *zone, long nr_pages) | |
f9901144 DH |
738 | { |
739 | unsigned long flags; | |
740 | ||
741 | zone->present_pages += nr_pages; | |
742 | pgdat_resize_lock(zone->zone_pgdat, &flags); | |
743 | zone->zone_pgdat->node_present_pages += nr_pages; | |
744 | pgdat_resize_unlock(zone->zone_pgdat, &flags); | |
745 | } | |
746 | ||
a08a2ae3 OS |
747 | int mhp_init_memmap_on_memory(unsigned long pfn, unsigned long nr_pages, |
748 | struct zone *zone) | |
749 | { | |
750 | unsigned long end_pfn = pfn + nr_pages; | |
751 | int ret; | |
752 | ||
753 | ret = kasan_add_zero_shadow(__va(PFN_PHYS(pfn)), PFN_PHYS(nr_pages)); | |
754 | if (ret) | |
755 | return ret; | |
756 | ||
757 | move_pfn_range_to_zone(zone, pfn, nr_pages, NULL, MIGRATE_UNMOVABLE); | |
758 | ||
759 | /* | |
760 | * It might be that the vmemmap_pages fully span sections. If that is | |
761 | * the case, mark those sections online here as otherwise they will be | |
762 | * left offline. | |
763 | */ | |
764 | if (nr_pages >= PAGES_PER_SECTION) | |
765 | online_mem_sections(pfn, ALIGN_DOWN(end_pfn, PAGES_PER_SECTION)); | |
766 | ||
767 | return ret; | |
768 | } | |
769 | ||
770 | void mhp_deinit_memmap_on_memory(unsigned long pfn, unsigned long nr_pages) | |
771 | { | |
772 | unsigned long end_pfn = pfn + nr_pages; | |
773 | ||
774 | /* | |
775 | * It might be that the vmemmap_pages fully span sections. If that is | |
776 | * the case, mark those sections offline here as otherwise they will be | |
777 | * left online. | |
778 | */ | |
779 | if (nr_pages >= PAGES_PER_SECTION) | |
780 | offline_mem_sections(pfn, ALIGN_DOWN(end_pfn, PAGES_PER_SECTION)); | |
781 | ||
782 | /* | |
783 | * The pages associated with this vmemmap have been offlined, so | |
784 | * we can reset its state here. | |
785 | */ | |
786 | remove_pfn_range_from_zone(page_zone(pfn_to_page(pfn)), pfn, nr_pages); | |
787 | kasan_remove_zero_shadow(__va(PFN_PHYS(pfn)), PFN_PHYS(nr_pages)); | |
788 | } | |
789 | ||
790 | int __ref online_pages(unsigned long pfn, unsigned long nr_pages, struct zone *zone) | |
75884fb1 | 791 | { |
aa47228a | 792 | unsigned long flags; |
6811378e | 793 | int need_zonelists_rebuild = 0; |
a08a2ae3 | 794 | const int nid = zone_to_nid(zone); |
7b78d335 YG |
795 | int ret; |
796 | struct memory_notify arg; | |
d0dc12e8 | 797 | |
dd8e2f23 OS |
798 | /* |
799 | * {on,off}lining is constrained to full memory sections (or more | |
800 | * precisly to memory blocks from the user space POV). | |
801 | * memmap_on_memory is an exception because it reserves initial part | |
802 | * of the physical memory space for vmemmaps. That space is pageblock | |
803 | * aligned. | |
804 | */ | |
4986fac1 | 805 | if (WARN_ON_ONCE(!nr_pages || |
dd8e2f23 OS |
806 | !IS_ALIGNED(pfn, pageblock_nr_pages) || |
807 | !IS_ALIGNED(pfn + nr_pages, PAGES_PER_SECTION))) | |
4986fac1 DH |
808 | return -EINVAL; |
809 | ||
381eab4a DH |
810 | mem_hotplug_begin(); |
811 | ||
f1dd2cd1 | 812 | /* associate pfn range with the zone */ |
b30c5927 | 813 | move_pfn_range_to_zone(zone, pfn, nr_pages, NULL, MIGRATE_ISOLATE); |
f1dd2cd1 | 814 | |
7b78d335 YG |
815 | arg.start_pfn = pfn; |
816 | arg.nr_pages = nr_pages; | |
d9713679 | 817 | node_states_check_changes_online(nr_pages, zone, &arg); |
7b78d335 | 818 | |
7b78d335 YG |
819 | ret = memory_notify(MEM_GOING_ONLINE, &arg); |
820 | ret = notifier_to_errno(ret); | |
e33e33b4 CY |
821 | if (ret) |
822 | goto failed_addition; | |
823 | ||
b30c5927 DH |
824 | /* |
825 | * Fixup the number of isolated pageblocks before marking the sections | |
826 | * onlining, such that undo_isolate_page_range() works correctly. | |
827 | */ | |
828 | spin_lock_irqsave(&zone->lock, flags); | |
829 | zone->nr_isolate_pageblock += nr_pages / pageblock_nr_pages; | |
830 | spin_unlock_irqrestore(&zone->lock, flags); | |
831 | ||
6811378e YG |
832 | /* |
833 | * If this zone is not populated, then it is not in zonelist. | |
834 | * This means the page allocator ignores this zone. | |
835 | * So, zonelist must be updated after online. | |
836 | */ | |
6dcd73d7 | 837 | if (!populated_zone(zone)) { |
6811378e | 838 | need_zonelists_rebuild = 1; |
72675e13 | 839 | setup_zone_pageset(zone); |
6dcd73d7 | 840 | } |
6811378e | 841 | |
aac65321 | 842 | online_pages_range(pfn, nr_pages); |
f9901144 | 843 | adjust_present_page_count(zone, nr_pages); |
aa47228a | 844 | |
b30c5927 DH |
845 | node_states_set_node(nid, &arg); |
846 | if (need_zonelists_rebuild) | |
847 | build_all_zonelists(NULL); | |
b30c5927 DH |
848 | |
849 | /* Basic onlining is complete, allow allocation of onlined pages. */ | |
850 | undo_isolate_page_range(pfn, pfn + nr_pages, MIGRATE_MOVABLE); | |
851 | ||
93146d98 | 852 | /* |
b86c5fc4 DH |
853 | * Freshly onlined pages aren't shuffled (e.g., all pages are placed to |
854 | * the tail of the freelist when undoing isolation). Shuffle the whole | |
855 | * zone to make sure the just onlined pages are properly distributed | |
856 | * across the whole freelist - to create an initial shuffle. | |
93146d98 | 857 | */ |
e900a918 DW |
858 | shuffle_zone(zone); |
859 | ||
b92ca18e | 860 | /* reinitialise watermarks and update pcp limits */ |
1b79acc9 KM |
861 | init_per_zone_wmark_min(); |
862 | ||
ca9a46f8 DH |
863 | kswapd_run(nid); |
864 | kcompactd_run(nid); | |
61b13993 | 865 | |
2d1d43f6 | 866 | writeback_set_ratelimit(); |
7b78d335 | 867 | |
ca9a46f8 | 868 | memory_notify(MEM_ONLINE, &arg); |
381eab4a | 869 | mem_hotplug_done(); |
30467e0b | 870 | return 0; |
e33e33b4 CY |
871 | |
872 | failed_addition: | |
873 | pr_debug("online_pages [mem %#010llx-%#010llx] failed\n", | |
874 | (unsigned long long) pfn << PAGE_SHIFT, | |
875 | (((unsigned long long) pfn + nr_pages) << PAGE_SHIFT) - 1); | |
876 | memory_notify(MEM_CANCEL_ONLINE, &arg); | |
feee6b29 | 877 | remove_pfn_range_from_zone(zone, pfn, nr_pages); |
381eab4a | 878 | mem_hotplug_done(); |
e33e33b4 | 879 | return ret; |
3947be19 | 880 | } |
53947027 | 881 | #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ |
bc02af93 | 882 | |
0bd85420 TC |
883 | static void reset_node_present_pages(pg_data_t *pgdat) |
884 | { | |
885 | struct zone *z; | |
886 | ||
887 | for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++) | |
888 | z->present_pages = 0; | |
889 | ||
890 | pgdat->node_present_pages = 0; | |
891 | } | |
892 | ||
e1319331 | 893 | /* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */ |
c68ab18c | 894 | static pg_data_t __ref *hotadd_new_pgdat(int nid) |
9af3c2de YG |
895 | { |
896 | struct pglist_data *pgdat; | |
9af3c2de | 897 | |
a1e565aa TC |
898 | pgdat = NODE_DATA(nid); |
899 | if (!pgdat) { | |
900 | pgdat = arch_alloc_nodedata(nid); | |
901 | if (!pgdat) | |
902 | return NULL; | |
9af3c2de | 903 | |
33fce011 WY |
904 | pgdat->per_cpu_nodestats = |
905 | alloc_percpu(struct per_cpu_nodestat); | |
a1e565aa | 906 | arch_refresh_nodedata(nid, pgdat); |
b0dc3a34 | 907 | } else { |
33fce011 | 908 | int cpu; |
e716f2eb | 909 | /* |
97a225e6 JK |
910 | * Reset the nr_zones, order and highest_zoneidx before reuse. |
911 | * Note that kswapd will init kswapd_highest_zoneidx properly | |
e716f2eb MG |
912 | * when it starts in the near future. |
913 | */ | |
b0dc3a34 | 914 | pgdat->nr_zones = 0; |
38087d9b | 915 | pgdat->kswapd_order = 0; |
97a225e6 | 916 | pgdat->kswapd_highest_zoneidx = 0; |
33fce011 WY |
917 | for_each_online_cpu(cpu) { |
918 | struct per_cpu_nodestat *p; | |
919 | ||
920 | p = per_cpu_ptr(pgdat->per_cpu_nodestats, cpu); | |
921 | memset(p, 0, sizeof(*p)); | |
922 | } | |
a1e565aa | 923 | } |
9af3c2de YG |
924 | |
925 | /* we can use NODE_DATA(nid) from here */ | |
03e85f9d | 926 | pgdat->node_id = nid; |
c68ab18c | 927 | pgdat->node_start_pfn = 0; |
03e85f9d | 928 | |
9af3c2de | 929 | /* init node's zones as empty zones, we don't have any present pages.*/ |
03e85f9d | 930 | free_area_init_core_hotplug(nid); |
9af3c2de | 931 | |
959ecc48 KH |
932 | /* |
933 | * The node we allocated has no zone fallback lists. For avoiding | |
934 | * to access not-initialized zonelist, build here. | |
935 | */ | |
72675e13 | 936 | build_all_zonelists(pgdat); |
959ecc48 | 937 | |
0bd85420 TC |
938 | /* |
939 | * When memory is hot-added, all the memory is in offline state. So | |
940 | * clear all zones' present_pages because they will be updated in | |
941 | * online_pages() and offline_pages(). | |
942 | */ | |
03e85f9d | 943 | reset_node_managed_pages(pgdat); |
0bd85420 TC |
944 | reset_node_present_pages(pgdat); |
945 | ||
9af3c2de YG |
946 | return pgdat; |
947 | } | |
948 | ||
b9ff0360 | 949 | static void rollback_node_hotadd(int nid) |
9af3c2de | 950 | { |
b9ff0360 OS |
951 | pg_data_t *pgdat = NODE_DATA(nid); |
952 | ||
9af3c2de | 953 | arch_refresh_nodedata(nid, NULL); |
5830169f | 954 | free_percpu(pgdat->per_cpu_nodestats); |
9af3c2de | 955 | arch_free_nodedata(pgdat); |
9af3c2de YG |
956 | } |
957 | ||
0a547039 | 958 | |
01b0f197 TK |
959 | /** |
960 | * try_online_node - online a node if offlined | |
e8b098fc | 961 | * @nid: the node ID |
b9ff0360 | 962 | * @set_node_online: Whether we want to online the node |
cf23422b | 963 | * called by cpu_up() to online a node without onlined memory. |
b9ff0360 OS |
964 | * |
965 | * Returns: | |
966 | * 1 -> a new node has been allocated | |
967 | * 0 -> the node is already online | |
968 | * -ENOMEM -> the node could not be allocated | |
cf23422b | 969 | */ |
c68ab18c | 970 | static int __try_online_node(int nid, bool set_node_online) |
cf23422b | 971 | { |
b9ff0360 OS |
972 | pg_data_t *pgdat; |
973 | int ret = 1; | |
cf23422b | 974 | |
01b0f197 TK |
975 | if (node_online(nid)) |
976 | return 0; | |
977 | ||
c68ab18c | 978 | pgdat = hotadd_new_pgdat(nid); |
7553e8f2 | 979 | if (!pgdat) { |
01b0f197 | 980 | pr_err("Cannot online node %d due to NULL pgdat\n", nid); |
cf23422b | 981 | ret = -ENOMEM; |
982 | goto out; | |
983 | } | |
b9ff0360 OS |
984 | |
985 | if (set_node_online) { | |
986 | node_set_online(nid); | |
987 | ret = register_one_node(nid); | |
988 | BUG_ON(ret); | |
989 | } | |
cf23422b | 990 | out: |
b9ff0360 OS |
991 | return ret; |
992 | } | |
993 | ||
994 | /* | |
995 | * Users of this function always want to online/register the node | |
996 | */ | |
997 | int try_online_node(int nid) | |
998 | { | |
999 | int ret; | |
1000 | ||
1001 | mem_hotplug_begin(); | |
c68ab18c | 1002 | ret = __try_online_node(nid, true); |
bfc8c901 | 1003 | mem_hotplug_done(); |
cf23422b | 1004 | return ret; |
1005 | } | |
1006 | ||
27356f54 TK |
1007 | static int check_hotplug_memory_range(u64 start, u64 size) |
1008 | { | |
ba325585 | 1009 | /* memory range must be block size aligned */ |
cec3ebd0 DH |
1010 | if (!size || !IS_ALIGNED(start, memory_block_size_bytes()) || |
1011 | !IS_ALIGNED(size, memory_block_size_bytes())) { | |
ba325585 | 1012 | pr_err("Block size [%#lx] unaligned hotplug range: start %#llx, size %#llx", |
cec3ebd0 | 1013 | memory_block_size_bytes(), start, size); |
27356f54 TK |
1014 | return -EINVAL; |
1015 | } | |
1016 | ||
1017 | return 0; | |
1018 | } | |
1019 | ||
31bc3858 VK |
1020 | static int online_memory_block(struct memory_block *mem, void *arg) |
1021 | { | |
1adf8b46 | 1022 | mem->online_type = mhp_default_online_type; |
dc18d706 | 1023 | return device_online(&mem->dev); |
31bc3858 VK |
1024 | } |
1025 | ||
a08a2ae3 OS |
1026 | bool mhp_supports_memmap_on_memory(unsigned long size) |
1027 | { | |
1028 | unsigned long nr_vmemmap_pages = size / PAGE_SIZE; | |
1029 | unsigned long vmemmap_size = nr_vmemmap_pages * sizeof(struct page); | |
1030 | unsigned long remaining_size = size - vmemmap_size; | |
1031 | ||
1032 | /* | |
1033 | * Besides having arch support and the feature enabled at runtime, we | |
1034 | * need a few more assumptions to hold true: | |
1035 | * | |
1036 | * a) We span a single memory block: memory onlining/offlinin;g happens | |
1037 | * in memory block granularity. We don't want the vmemmap of online | |
1038 | * memory blocks to reside on offline memory blocks. In the future, | |
1039 | * we might want to support variable-sized memory blocks to make the | |
1040 | * feature more versatile. | |
1041 | * | |
1042 | * b) The vmemmap pages span complete PMDs: We don't want vmemmap code | |
1043 | * to populate memory from the altmap for unrelated parts (i.e., | |
1044 | * other memory blocks) | |
1045 | * | |
1046 | * c) The vmemmap pages (and thereby the pages that will be exposed to | |
1047 | * the buddy) have to cover full pageblocks: memory onlining/offlining | |
1048 | * code requires applicable ranges to be page-aligned, for example, to | |
1049 | * set the migratetypes properly. | |
1050 | * | |
1051 | * TODO: Although we have a check here to make sure that vmemmap pages | |
1052 | * fully populate a PMD, it is not the right place to check for | |
1053 | * this. A much better solution involves improving vmemmap code | |
1054 | * to fallback to base pages when trying to populate vmemmap using | |
1055 | * altmap as an alternative source of memory, and we do not exactly | |
1056 | * populate a single PMD. | |
1057 | */ | |
1058 | return memmap_on_memory && | |
2d7a2171 | 1059 | !hugetlb_free_vmemmap_enabled && |
a08a2ae3 OS |
1060 | IS_ENABLED(CONFIG_MHP_MEMMAP_ON_MEMORY) && |
1061 | size == memory_block_size_bytes() && | |
1062 | IS_ALIGNED(vmemmap_size, PMD_SIZE) && | |
1063 | IS_ALIGNED(remaining_size, (pageblock_nr_pages << PAGE_SHIFT)); | |
1064 | } | |
1065 | ||
8df1d0e4 DH |
1066 | /* |
1067 | * NOTE: The caller must call lock_device_hotplug() to serialize hotplug | |
1068 | * and online/offline operations (triggered e.g. by sysfs). | |
1069 | * | |
1070 | * we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG | |
1071 | */ | |
b6117199 | 1072 | int __ref add_memory_resource(int nid, struct resource *res, mhp_t mhp_flags) |
bc02af93 | 1073 | { |
d15dfd31 | 1074 | struct mhp_params params = { .pgprot = pgprot_mhp(PAGE_KERNEL) }; |
a08a2ae3 | 1075 | struct vmem_altmap mhp_altmap = {}; |
62cedb9f | 1076 | u64 start, size; |
b9ff0360 | 1077 | bool new_node = false; |
bc02af93 YG |
1078 | int ret; |
1079 | ||
62cedb9f DV |
1080 | start = res->start; |
1081 | size = resource_size(res); | |
1082 | ||
27356f54 TK |
1083 | ret = check_hotplug_memory_range(start, size); |
1084 | if (ret) | |
1085 | return ret; | |
1086 | ||
fa6d9ec7 VV |
1087 | if (!node_possible(nid)) { |
1088 | WARN(1, "node %d was absent from the node_possible_map\n", nid); | |
1089 | return -EINVAL; | |
1090 | } | |
1091 | ||
bfc8c901 | 1092 | mem_hotplug_begin(); |
ac13c462 | 1093 | |
52219aea DH |
1094 | if (IS_ENABLED(CONFIG_ARCH_KEEP_MEMBLOCK)) |
1095 | memblock_add_node(start, size, nid); | |
7f36e3e5 | 1096 | |
c68ab18c | 1097 | ret = __try_online_node(nid, false); |
b9ff0360 OS |
1098 | if (ret < 0) |
1099 | goto error; | |
1100 | new_node = ret; | |
9af3c2de | 1101 | |
a08a2ae3 OS |
1102 | /* |
1103 | * Self hosted memmap array | |
1104 | */ | |
1105 | if (mhp_flags & MHP_MEMMAP_ON_MEMORY) { | |
1106 | if (!mhp_supports_memmap_on_memory(size)) { | |
1107 | ret = -EINVAL; | |
1108 | goto error; | |
1109 | } | |
1110 | mhp_altmap.free = PHYS_PFN(size); | |
1111 | mhp_altmap.base_pfn = PHYS_PFN(start); | |
1112 | params.altmap = &mhp_altmap; | |
1113 | } | |
1114 | ||
bc02af93 | 1115 | /* call arch's memory hotadd */ |
f5637d3b | 1116 | ret = arch_add_memory(nid, start, size, ¶ms); |
9af3c2de YG |
1117 | if (ret < 0) |
1118 | goto error; | |
1119 | ||
db051a0d | 1120 | /* create memory block devices after memory was added */ |
a08a2ae3 | 1121 | ret = create_memory_block_devices(start, size, mhp_altmap.alloc); |
db051a0d DH |
1122 | if (ret) { |
1123 | arch_remove_memory(nid, start, size, NULL); | |
1124 | goto error; | |
1125 | } | |
1126 | ||
a1e565aa | 1127 | if (new_node) { |
d5b6f6a3 | 1128 | /* If sysfs file of new node can't be created, cpu on the node |
0fc44159 YG |
1129 | * can't be hot-added. There is no rollback way now. |
1130 | * So, check by BUG_ON() to catch it reluctantly.. | |
d5b6f6a3 | 1131 | * We online node here. We can't roll back from here. |
0fc44159 | 1132 | */ |
d5b6f6a3 OS |
1133 | node_set_online(nid); |
1134 | ret = __register_one_node(nid); | |
0fc44159 YG |
1135 | BUG_ON(ret); |
1136 | } | |
1137 | ||
d5b6f6a3 | 1138 | /* link memory sections under this node.*/ |
90c7eaeb LD |
1139 | link_mem_sections(nid, PFN_DOWN(start), PFN_UP(start + size - 1), |
1140 | MEMINIT_HOTPLUG); | |
d5b6f6a3 | 1141 | |
d96ae530 | 1142 | /* create new memmap entry */ |
7b7b2721 DH |
1143 | if (!strcmp(res->name, "System RAM")) |
1144 | firmware_map_add_hotplug(start, start + size, "System RAM"); | |
d96ae530 | 1145 | |
381eab4a DH |
1146 | /* device_online() will take the lock when calling online_pages() */ |
1147 | mem_hotplug_done(); | |
1148 | ||
9ca6551e DH |
1149 | /* |
1150 | * In case we're allowed to merge the resource, flag it and trigger | |
1151 | * merging now that adding succeeded. | |
1152 | */ | |
26011267 | 1153 | if (mhp_flags & MHP_MERGE_RESOURCE) |
9ca6551e DH |
1154 | merge_system_ram_resource(res); |
1155 | ||
31bc3858 | 1156 | /* online pages if requested */ |
1adf8b46 | 1157 | if (mhp_default_online_type != MMOP_OFFLINE) |
fbcf73ce | 1158 | walk_memory_blocks(start, size, NULL, online_memory_block); |
31bc3858 | 1159 | |
381eab4a | 1160 | return ret; |
9af3c2de YG |
1161 | error: |
1162 | /* rollback pgdat allocation and others */ | |
b9ff0360 OS |
1163 | if (new_node) |
1164 | rollback_node_hotadd(nid); | |
52219aea DH |
1165 | if (IS_ENABLED(CONFIG_ARCH_KEEP_MEMBLOCK)) |
1166 | memblock_remove(start, size); | |
bfc8c901 | 1167 | mem_hotplug_done(); |
bc02af93 YG |
1168 | return ret; |
1169 | } | |
62cedb9f | 1170 | |
8df1d0e4 | 1171 | /* requires device_hotplug_lock, see add_memory_resource() */ |
b6117199 | 1172 | int __ref __add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags) |
62cedb9f DV |
1173 | { |
1174 | struct resource *res; | |
1175 | int ret; | |
1176 | ||
7b7b2721 | 1177 | res = register_memory_resource(start, size, "System RAM"); |
6f754ba4 VK |
1178 | if (IS_ERR(res)) |
1179 | return PTR_ERR(res); | |
62cedb9f | 1180 | |
b6117199 | 1181 | ret = add_memory_resource(nid, res, mhp_flags); |
62cedb9f DV |
1182 | if (ret < 0) |
1183 | release_memory_resource(res); | |
1184 | return ret; | |
1185 | } | |
8df1d0e4 | 1186 | |
b6117199 | 1187 | int add_memory(int nid, u64 start, u64 size, mhp_t mhp_flags) |
8df1d0e4 DH |
1188 | { |
1189 | int rc; | |
1190 | ||
1191 | lock_device_hotplug(); | |
b6117199 | 1192 | rc = __add_memory(nid, start, size, mhp_flags); |
8df1d0e4 DH |
1193 | unlock_device_hotplug(); |
1194 | ||
1195 | return rc; | |
1196 | } | |
bc02af93 | 1197 | EXPORT_SYMBOL_GPL(add_memory); |
0c0e6195 | 1198 | |
7b7b2721 DH |
1199 | /* |
1200 | * Add special, driver-managed memory to the system as system RAM. Such | |
1201 | * memory is not exposed via the raw firmware-provided memmap as system | |
1202 | * RAM, instead, it is detected and added by a driver - during cold boot, | |
1203 | * after a reboot, and after kexec. | |
1204 | * | |
1205 | * Reasons why this memory should not be used for the initial memmap of a | |
1206 | * kexec kernel or for placing kexec images: | |
1207 | * - The booting kernel is in charge of determining how this memory will be | |
1208 | * used (e.g., use persistent memory as system RAM) | |
1209 | * - Coordination with a hypervisor is required before this memory | |
1210 | * can be used (e.g., inaccessible parts). | |
1211 | * | |
1212 | * For this memory, no entries in /sys/firmware/memmap ("raw firmware-provided | |
1213 | * memory map") are created. Also, the created memory resource is flagged | |
7cf603d1 | 1214 | * with IORESOURCE_SYSRAM_DRIVER_MANAGED, so in-kernel users can special-case |
7b7b2721 DH |
1215 | * this memory as well (esp., not place kexec images onto it). |
1216 | * | |
1217 | * The resource_name (visible via /proc/iomem) has to have the format | |
1218 | * "System RAM ($DRIVER)". | |
1219 | */ | |
1220 | int add_memory_driver_managed(int nid, u64 start, u64 size, | |
b6117199 | 1221 | const char *resource_name, mhp_t mhp_flags) |
7b7b2721 DH |
1222 | { |
1223 | struct resource *res; | |
1224 | int rc; | |
1225 | ||
1226 | if (!resource_name || | |
1227 | strstr(resource_name, "System RAM (") != resource_name || | |
1228 | resource_name[strlen(resource_name) - 1] != ')') | |
1229 | return -EINVAL; | |
1230 | ||
1231 | lock_device_hotplug(); | |
1232 | ||
1233 | res = register_memory_resource(start, size, resource_name); | |
1234 | if (IS_ERR(res)) { | |
1235 | rc = PTR_ERR(res); | |
1236 | goto out_unlock; | |
1237 | } | |
1238 | ||
b6117199 | 1239 | rc = add_memory_resource(nid, res, mhp_flags); |
7b7b2721 DH |
1240 | if (rc < 0) |
1241 | release_memory_resource(res); | |
1242 | ||
1243 | out_unlock: | |
1244 | unlock_device_hotplug(); | |
1245 | return rc; | |
1246 | } | |
1247 | EXPORT_SYMBOL_GPL(add_memory_driver_managed); | |
1248 | ||
bca3feaa AK |
1249 | /* |
1250 | * Platforms should define arch_get_mappable_range() that provides | |
1251 | * maximum possible addressable physical memory range for which the | |
1252 | * linear mapping could be created. The platform returned address | |
1253 | * range must adhere to these following semantics. | |
1254 | * | |
1255 | * - range.start <= range.end | |
1256 | * - Range includes both end points [range.start..range.end] | |
1257 | * | |
1258 | * There is also a fallback definition provided here, allowing the | |
1259 | * entire possible physical address range in case any platform does | |
1260 | * not define arch_get_mappable_range(). | |
1261 | */ | |
1262 | struct range __weak arch_get_mappable_range(void) | |
1263 | { | |
1264 | struct range mhp_range = { | |
1265 | .start = 0UL, | |
1266 | .end = -1ULL, | |
1267 | }; | |
1268 | return mhp_range; | |
1269 | } | |
1270 | ||
1271 | struct range mhp_get_pluggable_range(bool need_mapping) | |
1272 | { | |
1273 | const u64 max_phys = (1ULL << MAX_PHYSMEM_BITS) - 1; | |
1274 | struct range mhp_range; | |
1275 | ||
1276 | if (need_mapping) { | |
1277 | mhp_range = arch_get_mappable_range(); | |
1278 | if (mhp_range.start > max_phys) { | |
1279 | mhp_range.start = 0; | |
1280 | mhp_range.end = 0; | |
1281 | } | |
1282 | mhp_range.end = min_t(u64, mhp_range.end, max_phys); | |
1283 | } else { | |
1284 | mhp_range.start = 0; | |
1285 | mhp_range.end = max_phys; | |
1286 | } | |
1287 | return mhp_range; | |
1288 | } | |
1289 | EXPORT_SYMBOL_GPL(mhp_get_pluggable_range); | |
1290 | ||
1291 | bool mhp_range_allowed(u64 start, u64 size, bool need_mapping) | |
1292 | { | |
1293 | struct range mhp_range = mhp_get_pluggable_range(need_mapping); | |
1294 | u64 end = start + size; | |
1295 | ||
1296 | if (start < end && start >= mhp_range.start && (end - 1) <= mhp_range.end) | |
1297 | return true; | |
1298 | ||
1299 | pr_warn("Hotplug memory [%#llx-%#llx] exceeds maximum addressable range [%#llx-%#llx]\n", | |
1300 | start, end, mhp_range.start, mhp_range.end); | |
1301 | return false; | |
1302 | } | |
1303 | ||
0c0e6195 KH |
1304 | #ifdef CONFIG_MEMORY_HOTREMOVE |
1305 | /* | |
92917998 DH |
1306 | * Confirm all pages in a range [start, end) belong to the same zone (skipping |
1307 | * memory holes). When true, return the zone. | |
0c0e6195 | 1308 | */ |
92917998 DH |
1309 | struct zone *test_pages_in_a_zone(unsigned long start_pfn, |
1310 | unsigned long end_pfn) | |
0c0e6195 | 1311 | { |
5f0f2887 | 1312 | unsigned long pfn, sec_end_pfn; |
0c0e6195 KH |
1313 | struct zone *zone = NULL; |
1314 | struct page *page; | |
1315 | int i; | |
deb88a2a | 1316 | for (pfn = start_pfn, sec_end_pfn = SECTION_ALIGN_UP(start_pfn + 1); |
0c0e6195 | 1317 | pfn < end_pfn; |
deb88a2a | 1318 | pfn = sec_end_pfn, sec_end_pfn += PAGES_PER_SECTION) { |
5f0f2887 AB |
1319 | /* Make sure the memory section is present first */ |
1320 | if (!present_section_nr(pfn_to_section_nr(pfn))) | |
0c0e6195 | 1321 | continue; |
5f0f2887 AB |
1322 | for (; pfn < sec_end_pfn && pfn < end_pfn; |
1323 | pfn += MAX_ORDER_NR_PAGES) { | |
1324 | i = 0; | |
1325 | /* This is just a CONFIG_HOLES_IN_ZONE check.*/ | |
1326 | while ((i < MAX_ORDER_NR_PAGES) && | |
1327 | !pfn_valid_within(pfn + i)) | |
1328 | i++; | |
d6d8c8a4 | 1329 | if (i == MAX_ORDER_NR_PAGES || pfn + i >= end_pfn) |
5f0f2887 | 1330 | continue; |
24feb47c MZ |
1331 | /* Check if we got outside of the zone */ |
1332 | if (zone && !zone_spans_pfn(zone, pfn + i)) | |
92917998 | 1333 | return NULL; |
5f0f2887 AB |
1334 | page = pfn_to_page(pfn + i); |
1335 | if (zone && page_zone(page) != zone) | |
92917998 | 1336 | return NULL; |
5f0f2887 AB |
1337 | zone = page_zone(page); |
1338 | } | |
0c0e6195 | 1339 | } |
deb88a2a | 1340 | |
92917998 | 1341 | return zone; |
0c0e6195 KH |
1342 | } |
1343 | ||
1344 | /* | |
0efadf48 | 1345 | * Scan pfn range [start,end) to find movable/migratable pages (LRU pages, |
aa218795 DH |
1346 | * non-lru movable pages and hugepages). Will skip over most unmovable |
1347 | * pages (esp., pages that can be skipped when offlining), but bail out on | |
1348 | * definitely unmovable pages. | |
1349 | * | |
1350 | * Returns: | |
1351 | * 0 in case a movable page is found and movable_pfn was updated. | |
1352 | * -ENOENT in case no movable page was found. | |
1353 | * -EBUSY in case a definitely unmovable page was found. | |
0c0e6195 | 1354 | */ |
aa218795 DH |
1355 | static int scan_movable_pages(unsigned long start, unsigned long end, |
1356 | unsigned long *movable_pfn) | |
0c0e6195 KH |
1357 | { |
1358 | unsigned long pfn; | |
eeb0efd0 | 1359 | |
0c0e6195 | 1360 | for (pfn = start; pfn < end; pfn++) { |
eeb0efd0 OS |
1361 | struct page *page, *head; |
1362 | unsigned long skip; | |
1363 | ||
1364 | if (!pfn_valid(pfn)) | |
1365 | continue; | |
1366 | page = pfn_to_page(pfn); | |
1367 | if (PageLRU(page)) | |
aa218795 | 1368 | goto found; |
eeb0efd0 | 1369 | if (__PageMovable(page)) |
aa218795 DH |
1370 | goto found; |
1371 | ||
1372 | /* | |
1373 | * PageOffline() pages that are not marked __PageMovable() and | |
1374 | * have a reference count > 0 (after MEM_GOING_OFFLINE) are | |
1375 | * definitely unmovable. If their reference count would be 0, | |
1376 | * they could at least be skipped when offlining memory. | |
1377 | */ | |
1378 | if (PageOffline(page) && page_count(page)) | |
1379 | return -EBUSY; | |
eeb0efd0 OS |
1380 | |
1381 | if (!PageHuge(page)) | |
1382 | continue; | |
1383 | head = compound_head(page); | |
8f251a3d MK |
1384 | /* |
1385 | * This test is racy as we hold no reference or lock. The | |
1386 | * hugetlb page could have been free'ed and head is no longer | |
1387 | * a hugetlb page before the following check. In such unlikely | |
1388 | * cases false positives and negatives are possible. Calling | |
1389 | * code must deal with these scenarios. | |
1390 | */ | |
1391 | if (HPageMigratable(head)) | |
aa218795 | 1392 | goto found; |
d8c6546b | 1393 | skip = compound_nr(head) - (page - head); |
eeb0efd0 | 1394 | pfn += skip - 1; |
0c0e6195 | 1395 | } |
aa218795 DH |
1396 | return -ENOENT; |
1397 | found: | |
1398 | *movable_pfn = pfn; | |
0c0e6195 KH |
1399 | return 0; |
1400 | } | |
1401 | ||
0c0e6195 KH |
1402 | static int |
1403 | do_migrate_range(unsigned long start_pfn, unsigned long end_pfn) | |
1404 | { | |
1405 | unsigned long pfn; | |
6c357848 | 1406 | struct page *page, *head; |
0c0e6195 KH |
1407 | int ret = 0; |
1408 | LIST_HEAD(source); | |
1409 | ||
a85009c3 | 1410 | for (pfn = start_pfn; pfn < end_pfn; pfn++) { |
0c0e6195 KH |
1411 | if (!pfn_valid(pfn)) |
1412 | continue; | |
1413 | page = pfn_to_page(pfn); | |
6c357848 | 1414 | head = compound_head(page); |
c8721bbb NH |
1415 | |
1416 | if (PageHuge(page)) { | |
d8c6546b | 1417 | pfn = page_to_pfn(head) + compound_nr(head) - 1; |
daf3538a | 1418 | isolate_huge_page(head, &source); |
c8721bbb | 1419 | continue; |
94723aaf | 1420 | } else if (PageTransHuge(page)) |
6c357848 | 1421 | pfn = page_to_pfn(head) + thp_nr_pages(page) - 1; |
c8721bbb | 1422 | |
b15c8726 MH |
1423 | /* |
1424 | * HWPoison pages have elevated reference counts so the migration would | |
1425 | * fail on them. It also doesn't make any sense to migrate them in the | |
1426 | * first place. Still try to unmap such a page in case it is still mapped | |
1427 | * (e.g. current hwpoison implementation doesn't unmap KSM pages but keep | |
1428 | * the unmap as the catch all safety net). | |
1429 | */ | |
1430 | if (PageHWPoison(page)) { | |
1431 | if (WARN_ON(PageLRU(page))) | |
1432 | isolate_lru_page(page); | |
1433 | if (page_mapped(page)) | |
013339df | 1434 | try_to_unmap(page, TTU_IGNORE_MLOCK); |
b15c8726 MH |
1435 | continue; |
1436 | } | |
1437 | ||
700c2a46 | 1438 | if (!get_page_unless_zero(page)) |
0c0e6195 KH |
1439 | continue; |
1440 | /* | |
0efadf48 YX |
1441 | * We can skip free pages. And we can deal with pages on |
1442 | * LRU and non-lru movable pages. | |
0c0e6195 | 1443 | */ |
0efadf48 YX |
1444 | if (PageLRU(page)) |
1445 | ret = isolate_lru_page(page); | |
1446 | else | |
1447 | ret = isolate_movable_page(page, ISOLATE_UNEVICTABLE); | |
0c0e6195 | 1448 | if (!ret) { /* Success */ |
62695a84 | 1449 | list_add_tail(&page->lru, &source); |
0efadf48 YX |
1450 | if (!__PageMovable(page)) |
1451 | inc_node_page_state(page, NR_ISOLATED_ANON + | |
9de4f22a | 1452 | page_is_file_lru(page)); |
6d9c285a | 1453 | |
0c0e6195 | 1454 | } else { |
2932c8b0 | 1455 | pr_warn("failed to isolate pfn %lx\n", pfn); |
0efadf48 | 1456 | dump_page(page, "isolation failed"); |
0c0e6195 | 1457 | } |
1723058e | 1458 | put_page(page); |
0c0e6195 | 1459 | } |
f3ab2636 | 1460 | if (!list_empty(&source)) { |
203e6e5c JK |
1461 | nodemask_t nmask = node_states[N_MEMORY]; |
1462 | struct migration_target_control mtc = { | |
1463 | .nmask = &nmask, | |
1464 | .gfp_mask = GFP_USER | __GFP_MOVABLE | __GFP_RETRY_MAYFAIL, | |
1465 | }; | |
1466 | ||
1467 | /* | |
1468 | * We have checked that migration range is on a single zone so | |
1469 | * we can use the nid of the first page to all the others. | |
1470 | */ | |
1471 | mtc.nid = page_to_nid(list_first_entry(&source, struct page, lru)); | |
1472 | ||
1473 | /* | |
1474 | * try to allocate from a different node but reuse this node | |
1475 | * if there are no other online nodes to be used (e.g. we are | |
1476 | * offlining a part of the only existing node) | |
1477 | */ | |
1478 | node_clear(mtc.nid, nmask); | |
1479 | if (nodes_empty(nmask)) | |
1480 | node_set(mtc.nid, nmask); | |
1481 | ret = migrate_pages(&source, alloc_migration_target, NULL, | |
1482 | (unsigned long)&mtc, MIGRATE_SYNC, MR_MEMORY_HOTPLUG); | |
2932c8b0 MH |
1483 | if (ret) { |
1484 | list_for_each_entry(page, &source, lru) { | |
1485 | pr_warn("migrating pfn %lx failed ret:%d ", | |
1486 | page_to_pfn(page), ret); | |
1487 | dump_page(page, "migration failure"); | |
1488 | } | |
c8721bbb | 1489 | putback_movable_pages(&source); |
2932c8b0 | 1490 | } |
0c0e6195 | 1491 | } |
1723058e | 1492 | |
0c0e6195 KH |
1493 | return ret; |
1494 | } | |
1495 | ||
c5320926 TC |
1496 | static int __init cmdline_parse_movable_node(char *p) |
1497 | { | |
55ac590c | 1498 | movable_node_enabled = true; |
c5320926 TC |
1499 | return 0; |
1500 | } | |
1501 | early_param("movable_node", cmdline_parse_movable_node); | |
1502 | ||
d9713679 LJ |
1503 | /* check which state of node_states will be changed when offline memory */ |
1504 | static void node_states_check_changes_offline(unsigned long nr_pages, | |
1505 | struct zone *zone, struct memory_notify *arg) | |
1506 | { | |
1507 | struct pglist_data *pgdat = zone->zone_pgdat; | |
1508 | unsigned long present_pages = 0; | |
86b27bea | 1509 | enum zone_type zt; |
d9713679 | 1510 | |
98fa15f3 AK |
1511 | arg->status_change_nid = NUMA_NO_NODE; |
1512 | arg->status_change_nid_normal = NUMA_NO_NODE; | |
1513 | arg->status_change_nid_high = NUMA_NO_NODE; | |
d9713679 LJ |
1514 | |
1515 | /* | |
86b27bea OS |
1516 | * Check whether node_states[N_NORMAL_MEMORY] will be changed. |
1517 | * If the memory to be offline is within the range | |
1518 | * [0..ZONE_NORMAL], and it is the last present memory there, | |
1519 | * the zones in that range will become empty after the offlining, | |
1520 | * thus we can determine that we need to clear the node from | |
1521 | * node_states[N_NORMAL_MEMORY]. | |
d9713679 | 1522 | */ |
86b27bea | 1523 | for (zt = 0; zt <= ZONE_NORMAL; zt++) |
d9713679 | 1524 | present_pages += pgdat->node_zones[zt].present_pages; |
86b27bea | 1525 | if (zone_idx(zone) <= ZONE_NORMAL && nr_pages >= present_pages) |
d9713679 | 1526 | arg->status_change_nid_normal = zone_to_nid(zone); |
d9713679 | 1527 | |
6715ddf9 LJ |
1528 | #ifdef CONFIG_HIGHMEM |
1529 | /* | |
86b27bea OS |
1530 | * node_states[N_HIGH_MEMORY] contains nodes which |
1531 | * have normal memory or high memory. | |
1532 | * Here we add the present_pages belonging to ZONE_HIGHMEM. | |
1533 | * If the zone is within the range of [0..ZONE_HIGHMEM), and | |
1534 | * we determine that the zones in that range become empty, | |
1535 | * we need to clear the node for N_HIGH_MEMORY. | |
6715ddf9 | 1536 | */ |
86b27bea OS |
1537 | present_pages += pgdat->node_zones[ZONE_HIGHMEM].present_pages; |
1538 | if (zone_idx(zone) <= ZONE_HIGHMEM && nr_pages >= present_pages) | |
6715ddf9 | 1539 | arg->status_change_nid_high = zone_to_nid(zone); |
6715ddf9 LJ |
1540 | #endif |
1541 | ||
d9713679 | 1542 | /* |
86b27bea OS |
1543 | * We have accounted the pages from [0..ZONE_NORMAL), and |
1544 | * in case of CONFIG_HIGHMEM the pages from ZONE_HIGHMEM | |
1545 | * as well. | |
1546 | * Here we count the possible pages from ZONE_MOVABLE. | |
1547 | * If after having accounted all the pages, we see that the nr_pages | |
1548 | * to be offlined is over or equal to the accounted pages, | |
1549 | * we know that the node will become empty, and so, we can clear | |
1550 | * it for N_MEMORY as well. | |
d9713679 | 1551 | */ |
86b27bea | 1552 | present_pages += pgdat->node_zones[ZONE_MOVABLE].present_pages; |
d9713679 | 1553 | |
d9713679 LJ |
1554 | if (nr_pages >= present_pages) |
1555 | arg->status_change_nid = zone_to_nid(zone); | |
d9713679 LJ |
1556 | } |
1557 | ||
1558 | static void node_states_clear_node(int node, struct memory_notify *arg) | |
1559 | { | |
1560 | if (arg->status_change_nid_normal >= 0) | |
1561 | node_clear_state(node, N_NORMAL_MEMORY); | |
1562 | ||
cf01f6f5 | 1563 | if (arg->status_change_nid_high >= 0) |
d9713679 | 1564 | node_clear_state(node, N_HIGH_MEMORY); |
6715ddf9 | 1565 | |
cf01f6f5 | 1566 | if (arg->status_change_nid >= 0) |
6715ddf9 | 1567 | node_clear_state(node, N_MEMORY); |
d9713679 LJ |
1568 | } |
1569 | ||
c5e79ef5 DH |
1570 | static int count_system_ram_pages_cb(unsigned long start_pfn, |
1571 | unsigned long nr_pages, void *data) | |
1572 | { | |
1573 | unsigned long *nr_system_ram_pages = data; | |
1574 | ||
1575 | *nr_system_ram_pages += nr_pages; | |
1576 | return 0; | |
1577 | } | |
1578 | ||
73a11c96 | 1579 | int __ref offline_pages(unsigned long start_pfn, unsigned long nr_pages) |
0c0e6195 | 1580 | { |
73a11c96 | 1581 | const unsigned long end_pfn = start_pfn + nr_pages; |
0a1a9a00 | 1582 | unsigned long pfn, system_ram_pages = 0; |
d702909f | 1583 | unsigned long flags; |
0c0e6195 | 1584 | struct zone *zone; |
7b78d335 | 1585 | struct memory_notify arg; |
ea15153c | 1586 | int ret, node; |
79605093 | 1587 | char *reason; |
0c0e6195 | 1588 | |
dd8e2f23 OS |
1589 | /* |
1590 | * {on,off}lining is constrained to full memory sections (or more | |
1591 | * precisly to memory blocks from the user space POV). | |
1592 | * memmap_on_memory is an exception because it reserves initial part | |
1593 | * of the physical memory space for vmemmaps. That space is pageblock | |
1594 | * aligned. | |
1595 | */ | |
4986fac1 | 1596 | if (WARN_ON_ONCE(!nr_pages || |
dd8e2f23 OS |
1597 | !IS_ALIGNED(start_pfn, pageblock_nr_pages) || |
1598 | !IS_ALIGNED(start_pfn + nr_pages, PAGES_PER_SECTION))) | |
4986fac1 DH |
1599 | return -EINVAL; |
1600 | ||
381eab4a DH |
1601 | mem_hotplug_begin(); |
1602 | ||
c5e79ef5 DH |
1603 | /* |
1604 | * Don't allow to offline memory blocks that contain holes. | |
1605 | * Consequently, memory blocks with holes can never get onlined | |
1606 | * via the hotplug path - online_pages() - as hotplugged memory has | |
1607 | * no holes. This way, we e.g., don't have to worry about marking | |
1608 | * memory holes PG_reserved, don't need pfn_valid() checks, and can | |
1609 | * avoid using walk_system_ram_range() later. | |
1610 | */ | |
73a11c96 | 1611 | walk_system_ram_range(start_pfn, nr_pages, &system_ram_pages, |
c5e79ef5 | 1612 | count_system_ram_pages_cb); |
73a11c96 | 1613 | if (system_ram_pages != nr_pages) { |
c5e79ef5 DH |
1614 | ret = -EINVAL; |
1615 | reason = "memory holes"; | |
1616 | goto failed_removal; | |
1617 | } | |
1618 | ||
0c0e6195 KH |
1619 | /* This makes hotplug much easier...and readable. |
1620 | we assume this for now. .*/ | |
92917998 DH |
1621 | zone = test_pages_in_a_zone(start_pfn, end_pfn); |
1622 | if (!zone) { | |
79605093 MH |
1623 | ret = -EINVAL; |
1624 | reason = "multizone range"; | |
1625 | goto failed_removal; | |
381eab4a | 1626 | } |
7b78d335 | 1627 | node = zone_to_nid(zone); |
7b78d335 | 1628 | |
ec6e8c7e VB |
1629 | /* |
1630 | * Disable pcplists so that page isolation cannot race with freeing | |
1631 | * in a way that pages from isolated pageblock are left on pcplists. | |
1632 | */ | |
1633 | zone_pcp_disable(zone); | |
d479960e | 1634 | lru_cache_disable(); |
ec6e8c7e | 1635 | |
0c0e6195 | 1636 | /* set above range as isolated */ |
b023f468 | 1637 | ret = start_isolate_page_range(start_pfn, end_pfn, |
d381c547 | 1638 | MIGRATE_MOVABLE, |
756d25be | 1639 | MEMORY_OFFLINE | REPORT_FAILURE); |
3fa0c7c7 | 1640 | if (ret) { |
79605093 | 1641 | reason = "failure to isolate range"; |
ec6e8c7e | 1642 | goto failed_removal_pcplists_disabled; |
381eab4a | 1643 | } |
7b78d335 YG |
1644 | |
1645 | arg.start_pfn = start_pfn; | |
1646 | arg.nr_pages = nr_pages; | |
d9713679 | 1647 | node_states_check_changes_offline(nr_pages, zone, &arg); |
7b78d335 YG |
1648 | |
1649 | ret = memory_notify(MEM_GOING_OFFLINE, &arg); | |
1650 | ret = notifier_to_errno(ret); | |
79605093 MH |
1651 | if (ret) { |
1652 | reason = "notifier failure"; | |
1653 | goto failed_removal_isolated; | |
1654 | } | |
7b78d335 | 1655 | |
bb8965bd | 1656 | do { |
aa218795 DH |
1657 | pfn = start_pfn; |
1658 | do { | |
bb8965bd MH |
1659 | if (signal_pending(current)) { |
1660 | ret = -EINTR; | |
1661 | reason = "signal backoff"; | |
1662 | goto failed_removal_isolated; | |
1663 | } | |
72b39cfc | 1664 | |
bb8965bd | 1665 | cond_resched(); |
bb8965bd | 1666 | |
aa218795 DH |
1667 | ret = scan_movable_pages(pfn, end_pfn, &pfn); |
1668 | if (!ret) { | |
bb8965bd MH |
1669 | /* |
1670 | * TODO: fatal migration failures should bail | |
1671 | * out | |
1672 | */ | |
1673 | do_migrate_range(pfn, end_pfn); | |
1674 | } | |
aa218795 DH |
1675 | } while (!ret); |
1676 | ||
1677 | if (ret != -ENOENT) { | |
1678 | reason = "unmovable page"; | |
1679 | goto failed_removal_isolated; | |
bb8965bd | 1680 | } |
0c0e6195 | 1681 | |
bb8965bd MH |
1682 | /* |
1683 | * Dissolve free hugepages in the memory block before doing | |
1684 | * offlining actually in order to make hugetlbfs's object | |
1685 | * counting consistent. | |
1686 | */ | |
1687 | ret = dissolve_free_huge_pages(start_pfn, end_pfn); | |
1688 | if (ret) { | |
1689 | reason = "failure to dissolve huge pages"; | |
1690 | goto failed_removal_isolated; | |
1691 | } | |
0a1a9a00 | 1692 | |
0a1a9a00 | 1693 | ret = test_pages_isolated(start_pfn, end_pfn, MEMORY_OFFLINE); |
ec6e8c7e | 1694 | |
5557c766 | 1695 | } while (ret); |
72b39cfc | 1696 | |
0a1a9a00 DH |
1697 | /* Mark all sections offline and remove free pages from the buddy. */ |
1698 | __offline_isolated_pages(start_pfn, end_pfn); | |
7c33023a | 1699 | pr_debug("Offlined Pages %ld\n", nr_pages); |
0a1a9a00 | 1700 | |
9b7ea46a | 1701 | /* |
b30c5927 DH |
1702 | * The memory sections are marked offline, and the pageblock flags |
1703 | * effectively stale; nobody should be touching them. Fixup the number | |
1704 | * of isolated pageblocks, memory onlining will properly revert this. | |
9b7ea46a QC |
1705 | */ |
1706 | spin_lock_irqsave(&zone->lock, flags); | |
ea15153c | 1707 | zone->nr_isolate_pageblock -= nr_pages / pageblock_nr_pages; |
9b7ea46a QC |
1708 | spin_unlock_irqrestore(&zone->lock, flags); |
1709 | ||
d479960e | 1710 | lru_cache_enable(); |
ec6e8c7e VB |
1711 | zone_pcp_enable(zone); |
1712 | ||
0c0e6195 | 1713 | /* removal success */ |
0a1a9a00 | 1714 | adjust_managed_page_count(pfn_to_page(start_pfn), -nr_pages); |
f9901144 | 1715 | adjust_present_page_count(zone, -nr_pages); |
7b78d335 | 1716 | |
b92ca18e | 1717 | /* reinitialise watermarks and update pcp limits */ |
1b79acc9 KM |
1718 | init_per_zone_wmark_min(); |
1719 | ||
1e8537ba | 1720 | if (!populated_zone(zone)) { |
340175b7 | 1721 | zone_pcp_reset(zone); |
72675e13 | 1722 | build_all_zonelists(NULL); |
b92ca18e | 1723 | } |
340175b7 | 1724 | |
d9713679 | 1725 | node_states_clear_node(node, &arg); |
698b1b30 | 1726 | if (arg.status_change_nid >= 0) { |
8fe23e05 | 1727 | kswapd_stop(node); |
698b1b30 VB |
1728 | kcompactd_stop(node); |
1729 | } | |
bce7394a | 1730 | |
0c0e6195 | 1731 | writeback_set_ratelimit(); |
7b78d335 YG |
1732 | |
1733 | memory_notify(MEM_OFFLINE, &arg); | |
feee6b29 | 1734 | remove_pfn_range_from_zone(zone, start_pfn, nr_pages); |
381eab4a | 1735 | mem_hotplug_done(); |
0c0e6195 KH |
1736 | return 0; |
1737 | ||
79605093 MH |
1738 | failed_removal_isolated: |
1739 | undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE); | |
c4efe484 | 1740 | memory_notify(MEM_CANCEL_OFFLINE, &arg); |
ec6e8c7e VB |
1741 | failed_removal_pcplists_disabled: |
1742 | zone_pcp_enable(zone); | |
0c0e6195 | 1743 | failed_removal: |
79605093 | 1744 | pr_debug("memory offlining [mem %#010llx-%#010llx] failed due to %s\n", |
e33e33b4 | 1745 | (unsigned long long) start_pfn << PAGE_SHIFT, |
79605093 MH |
1746 | ((unsigned long long) end_pfn << PAGE_SHIFT) - 1, |
1747 | reason); | |
0c0e6195 | 1748 | /* pushback to free area */ |
381eab4a | 1749 | mem_hotplug_done(); |
0c0e6195 KH |
1750 | return ret; |
1751 | } | |
71088785 | 1752 | |
d6de9d53 | 1753 | static int check_memblock_offlined_cb(struct memory_block *mem, void *arg) |
bbc76be6 WC |
1754 | { |
1755 | int ret = !is_memblock_offlined(mem); | |
1756 | ||
349daa0f RD |
1757 | if (unlikely(ret)) { |
1758 | phys_addr_t beginpa, endpa; | |
1759 | ||
1760 | beginpa = PFN_PHYS(section_nr_to_pfn(mem->start_section_nr)); | |
b6c88d3b | 1761 | endpa = beginpa + memory_block_size_bytes() - 1; |
756a025f | 1762 | pr_warn("removing memory fails, because memory [%pa-%pa] is onlined\n", |
349daa0f | 1763 | &beginpa, &endpa); |
bbc76be6 | 1764 | |
eca499ab PT |
1765 | return -EBUSY; |
1766 | } | |
1767 | return 0; | |
bbc76be6 WC |
1768 | } |
1769 | ||
a08a2ae3 OS |
1770 | static int get_nr_vmemmap_pages_cb(struct memory_block *mem, void *arg) |
1771 | { | |
1772 | /* | |
1773 | * If not set, continue with the next block. | |
1774 | */ | |
1775 | return mem->nr_vmemmap_pages; | |
1776 | } | |
1777 | ||
0f1cfe9d | 1778 | static int check_cpu_on_node(pg_data_t *pgdat) |
60a5a19e | 1779 | { |
60a5a19e TC |
1780 | int cpu; |
1781 | ||
1782 | for_each_present_cpu(cpu) { | |
1783 | if (cpu_to_node(cpu) == pgdat->node_id) | |
1784 | /* | |
1785 | * the cpu on this node isn't removed, and we can't | |
1786 | * offline this node. | |
1787 | */ | |
1788 | return -EBUSY; | |
1789 | } | |
1790 | ||
1791 | return 0; | |
1792 | } | |
1793 | ||
2c91f8fc DH |
1794 | static int check_no_memblock_for_node_cb(struct memory_block *mem, void *arg) |
1795 | { | |
1796 | int nid = *(int *)arg; | |
1797 | ||
1798 | /* | |
1799 | * If a memory block belongs to multiple nodes, the stored nid is not | |
1800 | * reliable. However, such blocks are always online (e.g., cannot get | |
1801 | * offlined) and, therefore, are still spanned by the node. | |
1802 | */ | |
1803 | return mem->nid == nid ? -EEXIST : 0; | |
1804 | } | |
1805 | ||
0f1cfe9d TK |
1806 | /** |
1807 | * try_offline_node | |
e8b098fc | 1808 | * @nid: the node ID |
0f1cfe9d TK |
1809 | * |
1810 | * Offline a node if all memory sections and cpus of the node are removed. | |
1811 | * | |
1812 | * NOTE: The caller must call lock_device_hotplug() to serialize hotplug | |
1813 | * and online/offline operations before this call. | |
1814 | */ | |
90b30cdc | 1815 | void try_offline_node(int nid) |
60a5a19e | 1816 | { |
d822b86a | 1817 | pg_data_t *pgdat = NODE_DATA(nid); |
2c91f8fc | 1818 | int rc; |
60a5a19e | 1819 | |
2c91f8fc DH |
1820 | /* |
1821 | * If the node still spans pages (especially ZONE_DEVICE), don't | |
1822 | * offline it. A node spans memory after move_pfn_range_to_zone(), | |
1823 | * e.g., after the memory block was onlined. | |
1824 | */ | |
1825 | if (pgdat->node_spanned_pages) | |
1826 | return; | |
60a5a19e | 1827 | |
2c91f8fc DH |
1828 | /* |
1829 | * Especially offline memory blocks might not be spanned by the | |
1830 | * node. They will get spanned by the node once they get onlined. | |
1831 | * However, they link to the node in sysfs and can get onlined later. | |
1832 | */ | |
1833 | rc = for_each_memory_block(&nid, check_no_memblock_for_node_cb); | |
1834 | if (rc) | |
60a5a19e | 1835 | return; |
60a5a19e | 1836 | |
46a3679b | 1837 | if (check_cpu_on_node(pgdat)) |
60a5a19e TC |
1838 | return; |
1839 | ||
1840 | /* | |
1841 | * all memory/cpu of this node are removed, we can offline this | |
1842 | * node now. | |
1843 | */ | |
1844 | node_set_offline(nid); | |
1845 | unregister_one_node(nid); | |
1846 | } | |
90b30cdc | 1847 | EXPORT_SYMBOL(try_offline_node); |
60a5a19e | 1848 | |
eca499ab | 1849 | static int __ref try_remove_memory(int nid, u64 start, u64 size) |
bbc76be6 | 1850 | { |
eca499ab | 1851 | int rc = 0; |
a08a2ae3 OS |
1852 | struct vmem_altmap mhp_altmap = {}; |
1853 | struct vmem_altmap *altmap = NULL; | |
1854 | unsigned long nr_vmemmap_pages; | |
993c1aad | 1855 | |
27356f54 TK |
1856 | BUG_ON(check_hotplug_memory_range(start, size)); |
1857 | ||
6677e3ea | 1858 | /* |
242831eb | 1859 | * All memory blocks must be offlined before removing memory. Check |
eca499ab | 1860 | * whether all memory blocks in question are offline and return error |
242831eb | 1861 | * if this is not the case. |
6677e3ea | 1862 | */ |
fbcf73ce | 1863 | rc = walk_memory_blocks(start, size, NULL, check_memblock_offlined_cb); |
eca499ab | 1864 | if (rc) |
b4223a51 | 1865 | return rc; |
6677e3ea | 1866 | |
a08a2ae3 OS |
1867 | /* |
1868 | * We only support removing memory added with MHP_MEMMAP_ON_MEMORY in | |
1869 | * the same granularity it was added - a single memory block. | |
1870 | */ | |
1871 | if (memmap_on_memory) { | |
1872 | nr_vmemmap_pages = walk_memory_blocks(start, size, NULL, | |
1873 | get_nr_vmemmap_pages_cb); | |
1874 | if (nr_vmemmap_pages) { | |
1875 | if (size != memory_block_size_bytes()) { | |
1876 | pr_warn("Refuse to remove %#llx - %#llx," | |
1877 | "wrong granularity\n", | |
1878 | start, start + size); | |
1879 | return -EINVAL; | |
1880 | } | |
1881 | ||
1882 | /* | |
1883 | * Let remove_pmd_table->free_hugepage_table do the | |
1884 | * right thing if we used vmem_altmap when hot-adding | |
1885 | * the range. | |
1886 | */ | |
1887 | mhp_altmap.alloc = nr_vmemmap_pages; | |
1888 | altmap = &mhp_altmap; | |
1889 | } | |
1890 | } | |
1891 | ||
46c66c4b YI |
1892 | /* remove memmap entry */ |
1893 | firmware_map_remove(start, start + size, "System RAM"); | |
4c4b7f9b | 1894 | |
f1037ec0 DW |
1895 | /* |
1896 | * Memory block device removal under the device_hotplug_lock is | |
1897 | * a barrier against racing online attempts. | |
1898 | */ | |
4c4b7f9b | 1899 | remove_memory_block_devices(start, size); |
46c66c4b | 1900 | |
f1037ec0 DW |
1901 | mem_hotplug_begin(); |
1902 | ||
a08a2ae3 | 1903 | arch_remove_memory(nid, start, size, altmap); |
52219aea DH |
1904 | |
1905 | if (IS_ENABLED(CONFIG_ARCH_KEEP_MEMBLOCK)) { | |
1906 | memblock_free(start, size); | |
1907 | memblock_remove(start, size); | |
1908 | } | |
1909 | ||
cb8e3c8b | 1910 | release_mem_region_adjustable(start, size); |
24d335ca | 1911 | |
60a5a19e TC |
1912 | try_offline_node(nid); |
1913 | ||
bfc8c901 | 1914 | mem_hotplug_done(); |
b4223a51 | 1915 | return 0; |
71088785 | 1916 | } |
d15e5926 | 1917 | |
eca499ab PT |
1918 | /** |
1919 | * remove_memory | |
1920 | * @nid: the node ID | |
1921 | * @start: physical address of the region to remove | |
1922 | * @size: size of the region to remove | |
1923 | * | |
1924 | * NOTE: The caller must call lock_device_hotplug() to serialize hotplug | |
1925 | * and online/offline operations before this call, as required by | |
1926 | * try_offline_node(). | |
1927 | */ | |
1928 | void __remove_memory(int nid, u64 start, u64 size) | |
1929 | { | |
1930 | ||
1931 | /* | |
29a90db9 | 1932 | * trigger BUG() if some memory is not offlined prior to calling this |
eca499ab PT |
1933 | * function |
1934 | */ | |
1935 | if (try_remove_memory(nid, start, size)) | |
1936 | BUG(); | |
1937 | } | |
1938 | ||
1939 | /* | |
1940 | * Remove memory if every memory block is offline, otherwise return -EBUSY is | |
1941 | * some memory is not offline | |
1942 | */ | |
1943 | int remove_memory(int nid, u64 start, u64 size) | |
d15e5926 | 1944 | { |
eca499ab PT |
1945 | int rc; |
1946 | ||
d15e5926 | 1947 | lock_device_hotplug(); |
eca499ab | 1948 | rc = try_remove_memory(nid, start, size); |
d15e5926 | 1949 | unlock_device_hotplug(); |
eca499ab PT |
1950 | |
1951 | return rc; | |
d15e5926 | 1952 | } |
71088785 | 1953 | EXPORT_SYMBOL_GPL(remove_memory); |
08b3acd7 | 1954 | |
8dc4bb58 DH |
1955 | static int try_offline_memory_block(struct memory_block *mem, void *arg) |
1956 | { | |
1957 | uint8_t online_type = MMOP_ONLINE_KERNEL; | |
1958 | uint8_t **online_types = arg; | |
1959 | struct page *page; | |
1960 | int rc; | |
1961 | ||
1962 | /* | |
1963 | * Sense the online_type via the zone of the memory block. Offlining | |
1964 | * with multiple zones within one memory block will be rejected | |
1965 | * by offlining code ... so we don't care about that. | |
1966 | */ | |
1967 | page = pfn_to_online_page(section_nr_to_pfn(mem->start_section_nr)); | |
1968 | if (page && zone_idx(page_zone(page)) == ZONE_MOVABLE) | |
1969 | online_type = MMOP_ONLINE_MOVABLE; | |
1970 | ||
1971 | rc = device_offline(&mem->dev); | |
1972 | /* | |
1973 | * Default is MMOP_OFFLINE - change it only if offlining succeeded, | |
1974 | * so try_reonline_memory_block() can do the right thing. | |
1975 | */ | |
1976 | if (!rc) | |
1977 | **online_types = online_type; | |
1978 | ||
1979 | (*online_types)++; | |
1980 | /* Ignore if already offline. */ | |
1981 | return rc < 0 ? rc : 0; | |
1982 | } | |
1983 | ||
1984 | static int try_reonline_memory_block(struct memory_block *mem, void *arg) | |
1985 | { | |
1986 | uint8_t **online_types = arg; | |
1987 | int rc; | |
1988 | ||
1989 | if (**online_types != MMOP_OFFLINE) { | |
1990 | mem->online_type = **online_types; | |
1991 | rc = device_online(&mem->dev); | |
1992 | if (rc < 0) | |
1993 | pr_warn("%s: Failed to re-online memory: %d", | |
1994 | __func__, rc); | |
1995 | } | |
1996 | ||
1997 | /* Continue processing all remaining memory blocks. */ | |
1998 | (*online_types)++; | |
1999 | return 0; | |
2000 | } | |
2001 | ||
08b3acd7 | 2002 | /* |
8dc4bb58 DH |
2003 | * Try to offline and remove memory. Might take a long time to finish in case |
2004 | * memory is still in use. Primarily useful for memory devices that logically | |
2005 | * unplugged all memory (so it's no longer in use) and want to offline + remove | |
2006 | * that memory. | |
08b3acd7 DH |
2007 | */ |
2008 | int offline_and_remove_memory(int nid, u64 start, u64 size) | |
2009 | { | |
8dc4bb58 DH |
2010 | const unsigned long mb_count = size / memory_block_size_bytes(); |
2011 | uint8_t *online_types, *tmp; | |
2012 | int rc; | |
08b3acd7 DH |
2013 | |
2014 | if (!IS_ALIGNED(start, memory_block_size_bytes()) || | |
8dc4bb58 DH |
2015 | !IS_ALIGNED(size, memory_block_size_bytes()) || !size) |
2016 | return -EINVAL; | |
2017 | ||
2018 | /* | |
2019 | * We'll remember the old online type of each memory block, so we can | |
2020 | * try to revert whatever we did when offlining one memory block fails | |
2021 | * after offlining some others succeeded. | |
2022 | */ | |
2023 | online_types = kmalloc_array(mb_count, sizeof(*online_types), | |
2024 | GFP_KERNEL); | |
2025 | if (!online_types) | |
2026 | return -ENOMEM; | |
2027 | /* | |
2028 | * Initialize all states to MMOP_OFFLINE, so when we abort processing in | |
2029 | * try_offline_memory_block(), we'll skip all unprocessed blocks in | |
2030 | * try_reonline_memory_block(). | |
2031 | */ | |
2032 | memset(online_types, MMOP_OFFLINE, mb_count); | |
08b3acd7 DH |
2033 | |
2034 | lock_device_hotplug(); | |
8dc4bb58 DH |
2035 | |
2036 | tmp = online_types; | |
2037 | rc = walk_memory_blocks(start, size, &tmp, try_offline_memory_block); | |
08b3acd7 DH |
2038 | |
2039 | /* | |
8dc4bb58 | 2040 | * In case we succeeded to offline all memory, remove it. |
08b3acd7 DH |
2041 | * This cannot fail as it cannot get onlined in the meantime. |
2042 | */ | |
2043 | if (!rc) { | |
2044 | rc = try_remove_memory(nid, start, size); | |
8dc4bb58 DH |
2045 | if (rc) |
2046 | pr_err("%s: Failed to remove memory: %d", __func__, rc); | |
2047 | } | |
2048 | ||
2049 | /* | |
2050 | * Rollback what we did. While memory onlining might theoretically fail | |
2051 | * (nacked by a notifier), it barely ever happens. | |
2052 | */ | |
2053 | if (rc) { | |
2054 | tmp = online_types; | |
2055 | walk_memory_blocks(start, size, &tmp, | |
2056 | try_reonline_memory_block); | |
08b3acd7 DH |
2057 | } |
2058 | unlock_device_hotplug(); | |
2059 | ||
8dc4bb58 | 2060 | kfree(online_types); |
08b3acd7 DH |
2061 | return rc; |
2062 | } | |
2063 | EXPORT_SYMBOL_GPL(offline_and_remove_memory); | |
aba6efc4 | 2064 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |