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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 | |
9d0ad8ca DK |
45 | /* |
46 | * online_page_callback contains pointer to current page onlining function. | |
47 | * Initially it is generic_online_page(). If it is required it could be | |
48 | * changed by calling set_online_page_callback() for callback registration | |
49 | * and restore_online_page_callback() for generic callback restore. | |
50 | */ | |
51 | ||
9d0ad8ca | 52 | static online_page_callback_t online_page_callback = generic_online_page; |
bfc8c901 | 53 | static DEFINE_MUTEX(online_page_callback_lock); |
9d0ad8ca | 54 | |
3f906ba2 | 55 | DEFINE_STATIC_PERCPU_RWSEM(mem_hotplug_lock); |
bfc8c901 | 56 | |
3f906ba2 TG |
57 | void get_online_mems(void) |
58 | { | |
59 | percpu_down_read(&mem_hotplug_lock); | |
60 | } | |
bfc8c901 | 61 | |
3f906ba2 TG |
62 | void put_online_mems(void) |
63 | { | |
64 | percpu_up_read(&mem_hotplug_lock); | |
65 | } | |
bfc8c901 | 66 | |
4932381e MH |
67 | bool movable_node_enabled = false; |
68 | ||
8604d9e5 | 69 | #ifndef CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE |
862919e5 | 70 | int memhp_default_online_type = MMOP_OFFLINE; |
8604d9e5 | 71 | #else |
862919e5 | 72 | int memhp_default_online_type = MMOP_ONLINE; |
8604d9e5 | 73 | #endif |
31bc3858 | 74 | |
86dd995d VK |
75 | static int __init setup_memhp_default_state(char *str) |
76 | { | |
5f47adf7 DH |
77 | const int online_type = memhp_online_type_from_str(str); |
78 | ||
79 | if (online_type >= 0) | |
80 | memhp_default_online_type = online_type; | |
86dd995d VK |
81 | |
82 | return 1; | |
83 | } | |
84 | __setup("memhp_default_state=", setup_memhp_default_state); | |
85 | ||
30467e0b | 86 | void mem_hotplug_begin(void) |
20d6c96b | 87 | { |
3f906ba2 TG |
88 | cpus_read_lock(); |
89 | percpu_down_write(&mem_hotplug_lock); | |
20d6c96b KM |
90 | } |
91 | ||
30467e0b | 92 | void mem_hotplug_done(void) |
bfc8c901 | 93 | { |
3f906ba2 TG |
94 | percpu_up_write(&mem_hotplug_lock); |
95 | cpus_read_unlock(); | |
bfc8c901 | 96 | } |
20d6c96b | 97 | |
357b4da5 JG |
98 | u64 max_mem_size = U64_MAX; |
99 | ||
45e0b78b | 100 | /* add this memory to iomem resource */ |
7b7b2721 DH |
101 | static struct resource *register_memory_resource(u64 start, u64 size, |
102 | const char *resource_name) | |
45e0b78b | 103 | { |
2794129e DH |
104 | struct resource *res; |
105 | unsigned long flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; | |
7b7b2721 DH |
106 | |
107 | if (strcmp(resource_name, "System RAM")) | |
108 | flags |= IORESOURCE_MEM_DRIVER_MANAGED; | |
357b4da5 | 109 | |
f3cd4c86 BH |
110 | /* |
111 | * Make sure value parsed from 'mem=' only restricts memory adding | |
112 | * while booting, so that memory hotplug won't be impacted. Please | |
113 | * refer to document of 'mem=' in kernel-parameters.txt for more | |
114 | * details. | |
115 | */ | |
116 | if (start + size > max_mem_size && system_state < SYSTEM_RUNNING) | |
357b4da5 JG |
117 | return ERR_PTR(-E2BIG); |
118 | ||
2794129e DH |
119 | /* |
120 | * Request ownership of the new memory range. This might be | |
121 | * a child of an existing resource that was present but | |
122 | * not marked as busy. | |
123 | */ | |
124 | res = __request_region(&iomem_resource, start, size, | |
125 | resource_name, flags); | |
126 | ||
127 | if (!res) { | |
128 | pr_debug("Unable to reserve System RAM region: %016llx->%016llx\n", | |
129 | start, start + size); | |
6f754ba4 | 130 | return ERR_PTR(-EEXIST); |
45e0b78b KM |
131 | } |
132 | return res; | |
133 | } | |
134 | ||
135 | static void release_memory_resource(struct resource *res) | |
136 | { | |
137 | if (!res) | |
138 | return; | |
139 | release_resource(res); | |
140 | kfree(res); | |
45e0b78b KM |
141 | } |
142 | ||
53947027 | 143 | #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE |
46723bfa YI |
144 | void get_page_bootmem(unsigned long info, struct page *page, |
145 | unsigned long type) | |
04753278 | 146 | { |
ddffe98d | 147 | page->freelist = (void *)type; |
04753278 YG |
148 | SetPagePrivate(page); |
149 | set_page_private(page, info); | |
fe896d18 | 150 | page_ref_inc(page); |
04753278 YG |
151 | } |
152 | ||
170a5a7e | 153 | void put_page_bootmem(struct page *page) |
04753278 | 154 | { |
5f24ce5f | 155 | unsigned long type; |
04753278 | 156 | |
ddffe98d | 157 | type = (unsigned long) page->freelist; |
5f24ce5f AA |
158 | BUG_ON(type < MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE || |
159 | type > MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE); | |
04753278 | 160 | |
fe896d18 | 161 | if (page_ref_dec_return(page) == 1) { |
ddffe98d | 162 | page->freelist = NULL; |
04753278 YG |
163 | ClearPagePrivate(page); |
164 | set_page_private(page, 0); | |
5f24ce5f | 165 | INIT_LIST_HEAD(&page->lru); |
170a5a7e | 166 | free_reserved_page(page); |
04753278 | 167 | } |
04753278 YG |
168 | } |
169 | ||
46723bfa YI |
170 | #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE |
171 | #ifndef CONFIG_SPARSEMEM_VMEMMAP | |
d92bc318 | 172 | static void register_page_bootmem_info_section(unsigned long start_pfn) |
04753278 | 173 | { |
f1eca35a | 174 | unsigned long mapsize, section_nr, i; |
04753278 YG |
175 | struct mem_section *ms; |
176 | struct page *page, *memmap; | |
f1eca35a | 177 | struct mem_section_usage *usage; |
04753278 | 178 | |
04753278 YG |
179 | section_nr = pfn_to_section_nr(start_pfn); |
180 | ms = __nr_to_section(section_nr); | |
181 | ||
182 | /* Get section's memmap address */ | |
183 | memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); | |
184 | ||
185 | /* | |
186 | * Get page for the memmap's phys address | |
187 | * XXX: need more consideration for sparse_vmemmap... | |
188 | */ | |
189 | page = virt_to_page(memmap); | |
190 | mapsize = sizeof(struct page) * PAGES_PER_SECTION; | |
191 | mapsize = PAGE_ALIGN(mapsize) >> PAGE_SHIFT; | |
192 | ||
193 | /* remember memmap's page */ | |
194 | for (i = 0; i < mapsize; i++, page++) | |
195 | get_page_bootmem(section_nr, page, SECTION_INFO); | |
196 | ||
f1eca35a DW |
197 | usage = ms->usage; |
198 | page = virt_to_page(usage); | |
04753278 | 199 | |
f1eca35a | 200 | mapsize = PAGE_ALIGN(mem_section_usage_size()) >> PAGE_SHIFT; |
04753278 YG |
201 | |
202 | for (i = 0; i < mapsize; i++, page++) | |
af370fb8 | 203 | get_page_bootmem(section_nr, page, MIX_SECTION_INFO); |
04753278 YG |
204 | |
205 | } | |
46723bfa YI |
206 | #else /* CONFIG_SPARSEMEM_VMEMMAP */ |
207 | static void register_page_bootmem_info_section(unsigned long start_pfn) | |
208 | { | |
f1eca35a | 209 | unsigned long mapsize, section_nr, i; |
46723bfa YI |
210 | struct mem_section *ms; |
211 | struct page *page, *memmap; | |
f1eca35a | 212 | struct mem_section_usage *usage; |
46723bfa | 213 | |
46723bfa YI |
214 | section_nr = pfn_to_section_nr(start_pfn); |
215 | ms = __nr_to_section(section_nr); | |
216 | ||
217 | memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); | |
218 | ||
219 | register_page_bootmem_memmap(section_nr, memmap, PAGES_PER_SECTION); | |
220 | ||
f1eca35a DW |
221 | usage = ms->usage; |
222 | page = virt_to_page(usage); | |
46723bfa | 223 | |
f1eca35a | 224 | mapsize = PAGE_ALIGN(mem_section_usage_size()) >> PAGE_SHIFT; |
46723bfa YI |
225 | |
226 | for (i = 0; i < mapsize; i++, page++) | |
227 | get_page_bootmem(section_nr, page, MIX_SECTION_INFO); | |
228 | } | |
229 | #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ | |
04753278 | 230 | |
7ded384a | 231 | void __init register_page_bootmem_info_node(struct pglist_data *pgdat) |
04753278 YG |
232 | { |
233 | unsigned long i, pfn, end_pfn, nr_pages; | |
234 | int node = pgdat->node_id; | |
235 | struct page *page; | |
04753278 YG |
236 | |
237 | nr_pages = PAGE_ALIGN(sizeof(struct pglist_data)) >> PAGE_SHIFT; | |
238 | page = virt_to_page(pgdat); | |
239 | ||
240 | for (i = 0; i < nr_pages; i++, page++) | |
241 | get_page_bootmem(node, page, NODE_INFO); | |
242 | ||
04753278 | 243 | pfn = pgdat->node_start_pfn; |
c1f19495 | 244 | end_pfn = pgdat_end_pfn(pgdat); |
04753278 | 245 | |
7e9f5eb0 | 246 | /* register section info */ |
f14851af | 247 | for (; pfn < end_pfn; pfn += PAGES_PER_SECTION) { |
248 | /* | |
249 | * Some platforms can assign the same pfn to multiple nodes - on | |
250 | * node0 as well as nodeN. To avoid registering a pfn against | |
251 | * multiple nodes we check that this pfn does not already | |
7e9f5eb0 | 252 | * reside in some other nodes. |
f14851af | 253 | */ |
f65e91df | 254 | if (pfn_valid(pfn) && (early_pfn_to_nid(pfn) == node)) |
f14851af | 255 | register_page_bootmem_info_section(pfn); |
256 | } | |
04753278 | 257 | } |
46723bfa | 258 | #endif /* CONFIG_HAVE_BOOTMEM_INFO_NODE */ |
04753278 | 259 | |
7ea62160 DW |
260 | static int check_pfn_span(unsigned long pfn, unsigned long nr_pages, |
261 | const char *reason) | |
262 | { | |
263 | /* | |
264 | * Disallow all operations smaller than a sub-section and only | |
265 | * allow operations smaller than a section for | |
266 | * SPARSEMEM_VMEMMAP. Note that check_hotplug_memory_range() | |
267 | * enforces a larger memory_block_size_bytes() granularity for | |
268 | * memory that will be marked online, so this check should only | |
269 | * fire for direct arch_{add,remove}_memory() users outside of | |
270 | * add_memory_resource(). | |
271 | */ | |
272 | unsigned long min_align; | |
273 | ||
274 | if (IS_ENABLED(CONFIG_SPARSEMEM_VMEMMAP)) | |
275 | min_align = PAGES_PER_SUBSECTION; | |
276 | else | |
277 | min_align = PAGES_PER_SECTION; | |
278 | if (!IS_ALIGNED(pfn, min_align) | |
279 | || !IS_ALIGNED(nr_pages, min_align)) { | |
280 | WARN(1, "Misaligned __%s_pages start: %#lx end: #%lx\n", | |
281 | reason, pfn, pfn + nr_pages - 1); | |
282 | return -EINVAL; | |
283 | } | |
284 | return 0; | |
285 | } | |
286 | ||
dca4436d AS |
287 | static int check_hotplug_memory_addressable(unsigned long pfn, |
288 | unsigned long nr_pages) | |
289 | { | |
290 | const u64 max_addr = PFN_PHYS(pfn + nr_pages) - 1; | |
291 | ||
292 | if (max_addr >> MAX_PHYSMEM_BITS) { | |
293 | const u64 max_allowed = (1ull << (MAX_PHYSMEM_BITS + 1)) - 1; | |
294 | WARN(1, | |
295 | "Hotplugged memory exceeds maximum addressable address, range=%#llx-%#llx, maximum=%#llx\n", | |
296 | (u64)PFN_PHYS(pfn), max_addr, max_allowed); | |
297 | return -E2BIG; | |
298 | } | |
299 | ||
300 | return 0; | |
301 | } | |
302 | ||
4edd7cef DR |
303 | /* |
304 | * Reasonably generic function for adding memory. It is | |
305 | * expected that archs that support memory hotplug will | |
306 | * call this function after deciding the zone to which to | |
307 | * add the new pages. | |
308 | */ | |
7ea62160 | 309 | int __ref __add_pages(int nid, unsigned long pfn, unsigned long nr_pages, |
f5637d3b | 310 | struct mhp_params *params) |
4edd7cef | 311 | { |
6cdd0b30 DH |
312 | const unsigned long end_pfn = pfn + nr_pages; |
313 | unsigned long cur_nr_pages; | |
9a845030 | 314 | int err; |
f5637d3b | 315 | struct vmem_altmap *altmap = params->altmap; |
4b94ffdc | 316 | |
bfeb022f LG |
317 | if (WARN_ON_ONCE(!params->pgprot.pgprot)) |
318 | return -EINVAL; | |
319 | ||
dca4436d AS |
320 | err = check_hotplug_memory_addressable(pfn, nr_pages); |
321 | if (err) | |
322 | return err; | |
323 | ||
4b94ffdc DW |
324 | if (altmap) { |
325 | /* | |
326 | * Validate altmap is within bounds of the total request | |
327 | */ | |
7ea62160 | 328 | if (altmap->base_pfn != pfn |
4b94ffdc DW |
329 | || vmem_altmap_offset(altmap) > nr_pages) { |
330 | pr_warn_once("memory add fail, invalid altmap\n"); | |
7ea62160 | 331 | return -EINVAL; |
4b94ffdc DW |
332 | } |
333 | altmap->alloc = 0; | |
334 | } | |
335 | ||
7ea62160 DW |
336 | err = check_pfn_span(pfn, nr_pages, "add"); |
337 | if (err) | |
338 | return err; | |
339 | ||
6cdd0b30 DH |
340 | for (; pfn < end_pfn; pfn += cur_nr_pages) { |
341 | /* Select all remaining pages up to the next section boundary */ | |
342 | cur_nr_pages = min(end_pfn - pfn, | |
343 | SECTION_ALIGN_UP(pfn + 1) - pfn); | |
344 | err = sparse_add_section(nid, pfn, cur_nr_pages, altmap); | |
ba72b4c8 DW |
345 | if (err) |
346 | break; | |
f64ac5e6 | 347 | cond_resched(); |
4edd7cef | 348 | } |
c435a390 | 349 | vmemmap_populate_print_last(); |
4edd7cef DR |
350 | return err; |
351 | } | |
4edd7cef | 352 | |
d622ecec JH |
353 | #ifdef CONFIG_NUMA |
354 | int __weak memory_add_physaddr_to_nid(u64 start) | |
355 | { | |
356 | pr_info_once("Unknown target node for memory at 0x%llx, assuming node 0\n", | |
357 | start); | |
358 | return 0; | |
359 | } | |
360 | EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid); | |
361 | #endif | |
362 | ||
815121d2 | 363 | /* find the smallest valid pfn in the range [start_pfn, end_pfn) */ |
d09b0137 | 364 | static unsigned long find_smallest_section_pfn(int nid, struct zone *zone, |
815121d2 YI |
365 | unsigned long start_pfn, |
366 | unsigned long end_pfn) | |
367 | { | |
49ba3c6b | 368 | for (; start_pfn < end_pfn; start_pfn += PAGES_PER_SUBSECTION) { |
7ce700bf | 369 | if (unlikely(!pfn_to_online_page(start_pfn))) |
815121d2 YI |
370 | continue; |
371 | ||
372 | if (unlikely(pfn_to_nid(start_pfn) != nid)) | |
373 | continue; | |
374 | ||
9b05158f | 375 | if (zone != page_zone(pfn_to_page(start_pfn))) |
815121d2 YI |
376 | continue; |
377 | ||
378 | return start_pfn; | |
379 | } | |
380 | ||
381 | return 0; | |
382 | } | |
383 | ||
384 | /* find the biggest valid pfn in the range [start_pfn, end_pfn). */ | |
d09b0137 | 385 | static unsigned long find_biggest_section_pfn(int nid, struct zone *zone, |
815121d2 YI |
386 | unsigned long start_pfn, |
387 | unsigned long end_pfn) | |
388 | { | |
815121d2 YI |
389 | unsigned long pfn; |
390 | ||
391 | /* pfn is the end pfn of a memory section. */ | |
392 | pfn = end_pfn - 1; | |
49ba3c6b | 393 | for (; pfn >= start_pfn; pfn -= PAGES_PER_SUBSECTION) { |
7ce700bf | 394 | if (unlikely(!pfn_to_online_page(pfn))) |
815121d2 YI |
395 | continue; |
396 | ||
397 | if (unlikely(pfn_to_nid(pfn) != nid)) | |
398 | continue; | |
399 | ||
9b05158f | 400 | if (zone != page_zone(pfn_to_page(pfn))) |
815121d2 YI |
401 | continue; |
402 | ||
403 | return pfn; | |
404 | } | |
405 | ||
406 | return 0; | |
407 | } | |
408 | ||
409 | static void shrink_zone_span(struct zone *zone, unsigned long start_pfn, | |
410 | unsigned long end_pfn) | |
411 | { | |
815121d2 | 412 | unsigned long pfn; |
815121d2 YI |
413 | int nid = zone_to_nid(zone); |
414 | ||
415 | zone_span_writelock(zone); | |
5d12071c | 416 | if (zone->zone_start_pfn == start_pfn) { |
815121d2 YI |
417 | /* |
418 | * If the section is smallest section in the zone, it need | |
419 | * shrink zone->zone_start_pfn and zone->zone_spanned_pages. | |
420 | * In this case, we find second smallest valid mem_section | |
421 | * for shrinking zone. | |
422 | */ | |
423 | pfn = find_smallest_section_pfn(nid, zone, end_pfn, | |
5d12071c | 424 | zone_end_pfn(zone)); |
815121d2 | 425 | if (pfn) { |
5d12071c | 426 | zone->spanned_pages = zone_end_pfn(zone) - pfn; |
815121d2 | 427 | zone->zone_start_pfn = pfn; |
950b68d9 DH |
428 | } else { |
429 | zone->zone_start_pfn = 0; | |
430 | zone->spanned_pages = 0; | |
815121d2 | 431 | } |
5d12071c | 432 | } else if (zone_end_pfn(zone) == end_pfn) { |
815121d2 YI |
433 | /* |
434 | * If the section is biggest section in the zone, it need | |
435 | * shrink zone->spanned_pages. | |
436 | * In this case, we find second biggest valid mem_section for | |
437 | * shrinking zone. | |
438 | */ | |
5d12071c | 439 | pfn = find_biggest_section_pfn(nid, zone, zone->zone_start_pfn, |
815121d2 YI |
440 | start_pfn); |
441 | if (pfn) | |
5d12071c | 442 | zone->spanned_pages = pfn - zone->zone_start_pfn + 1; |
950b68d9 DH |
443 | else { |
444 | zone->zone_start_pfn = 0; | |
445 | zone->spanned_pages = 0; | |
446 | } | |
815121d2 | 447 | } |
815121d2 YI |
448 | zone_span_writeunlock(zone); |
449 | } | |
450 | ||
00d6c019 | 451 | static void update_pgdat_span(struct pglist_data *pgdat) |
815121d2 | 452 | { |
00d6c019 DH |
453 | unsigned long node_start_pfn = 0, node_end_pfn = 0; |
454 | struct zone *zone; | |
455 | ||
456 | for (zone = pgdat->node_zones; | |
457 | zone < pgdat->node_zones + MAX_NR_ZONES; zone++) { | |
458 | unsigned long zone_end_pfn = zone->zone_start_pfn + | |
459 | zone->spanned_pages; | |
460 | ||
461 | /* No need to lock the zones, they can't change. */ | |
656d5711 DH |
462 | if (!zone->spanned_pages) |
463 | continue; | |
464 | if (!node_end_pfn) { | |
465 | node_start_pfn = zone->zone_start_pfn; | |
466 | node_end_pfn = zone_end_pfn; | |
467 | continue; | |
468 | } | |
469 | ||
00d6c019 DH |
470 | if (zone_end_pfn > node_end_pfn) |
471 | node_end_pfn = zone_end_pfn; | |
472 | if (zone->zone_start_pfn < node_start_pfn) | |
473 | node_start_pfn = zone->zone_start_pfn; | |
815121d2 YI |
474 | } |
475 | ||
00d6c019 DH |
476 | pgdat->node_start_pfn = node_start_pfn; |
477 | pgdat->node_spanned_pages = node_end_pfn - node_start_pfn; | |
815121d2 YI |
478 | } |
479 | ||
feee6b29 DH |
480 | void __ref remove_pfn_range_from_zone(struct zone *zone, |
481 | unsigned long start_pfn, | |
482 | unsigned long nr_pages) | |
815121d2 | 483 | { |
b7e3debd | 484 | const unsigned long end_pfn = start_pfn + nr_pages; |
815121d2 | 485 | struct pglist_data *pgdat = zone->zone_pgdat; |
b7e3debd | 486 | unsigned long pfn, cur_nr_pages, flags; |
815121d2 | 487 | |
d33695b1 | 488 | /* Poison struct pages because they are now uninitialized again. */ |
b7e3debd BW |
489 | for (pfn = start_pfn; pfn < end_pfn; pfn += cur_nr_pages) { |
490 | cond_resched(); | |
491 | ||
492 | /* Select all remaining pages up to the next section boundary */ | |
493 | cur_nr_pages = | |
494 | min(end_pfn - pfn, SECTION_ALIGN_UP(pfn + 1) - pfn); | |
495 | page_init_poison(pfn_to_page(pfn), | |
496 | sizeof(struct page) * cur_nr_pages); | |
497 | } | |
d33695b1 | 498 | |
7ce700bf DH |
499 | #ifdef CONFIG_ZONE_DEVICE |
500 | /* | |
501 | * Zone shrinking code cannot properly deal with ZONE_DEVICE. So | |
502 | * we will not try to shrink the zones - which is okay as | |
503 | * set_zone_contiguous() cannot deal with ZONE_DEVICE either way. | |
504 | */ | |
505 | if (zone_idx(zone) == ZONE_DEVICE) | |
506 | return; | |
507 | #endif | |
508 | ||
feee6b29 DH |
509 | clear_zone_contiguous(zone); |
510 | ||
815121d2 YI |
511 | pgdat_resize_lock(zone->zone_pgdat, &flags); |
512 | shrink_zone_span(zone, start_pfn, start_pfn + nr_pages); | |
00d6c019 | 513 | update_pgdat_span(pgdat); |
815121d2 | 514 | pgdat_resize_unlock(zone->zone_pgdat, &flags); |
feee6b29 DH |
515 | |
516 | set_zone_contiguous(zone); | |
815121d2 YI |
517 | } |
518 | ||
feee6b29 DH |
519 | static void __remove_section(unsigned long pfn, unsigned long nr_pages, |
520 | unsigned long map_offset, | |
521 | struct vmem_altmap *altmap) | |
ea01ea93 | 522 | { |
10404901 | 523 | struct mem_section *ms = __pfn_to_section(pfn); |
ea01ea93 | 524 | |
9d1d887d DH |
525 | if (WARN_ON_ONCE(!valid_section(ms))) |
526 | return; | |
ea01ea93 | 527 | |
ba72b4c8 | 528 | sparse_remove_section(ms, pfn, nr_pages, map_offset, altmap); |
ea01ea93 BP |
529 | } |
530 | ||
ea01ea93 | 531 | /** |
feee6b29 | 532 | * __remove_pages() - remove sections of pages |
7ea62160 | 533 | * @pfn: starting pageframe (must be aligned to start of a section) |
ea01ea93 | 534 | * @nr_pages: number of pages to remove (must be multiple of section size) |
e8b098fc | 535 | * @altmap: alternative device page map or %NULL if default memmap is used |
ea01ea93 BP |
536 | * |
537 | * Generic helper function to remove section mappings and sysfs entries | |
538 | * for the section of the memory we are removing. Caller needs to make | |
539 | * sure that pages are marked reserved and zones are adjust properly by | |
540 | * calling offline_pages(). | |
541 | */ | |
feee6b29 DH |
542 | void __remove_pages(unsigned long pfn, unsigned long nr_pages, |
543 | struct vmem_altmap *altmap) | |
ea01ea93 | 544 | { |
52fb87c8 DH |
545 | const unsigned long end_pfn = pfn + nr_pages; |
546 | unsigned long cur_nr_pages; | |
4b94ffdc | 547 | unsigned long map_offset = 0; |
4b94ffdc | 548 | |
96da4350 | 549 | map_offset = vmem_altmap_offset(altmap); |
ea01ea93 | 550 | |
7ea62160 DW |
551 | if (check_pfn_span(pfn, nr_pages, "remove")) |
552 | return; | |
ea01ea93 | 553 | |
52fb87c8 | 554 | for (; pfn < end_pfn; pfn += cur_nr_pages) { |
dd33ad7b | 555 | cond_resched(); |
52fb87c8 | 556 | /* Select all remaining pages up to the next section boundary */ |
a11b9419 DH |
557 | cur_nr_pages = min(end_pfn - pfn, |
558 | SECTION_ALIGN_UP(pfn + 1) - pfn); | |
52fb87c8 | 559 | __remove_section(pfn, cur_nr_pages, map_offset, altmap); |
4b94ffdc | 560 | map_offset = 0; |
ea01ea93 | 561 | } |
ea01ea93 | 562 | } |
ea01ea93 | 563 | |
9d0ad8ca DK |
564 | int set_online_page_callback(online_page_callback_t callback) |
565 | { | |
566 | int rc = -EINVAL; | |
567 | ||
bfc8c901 VD |
568 | get_online_mems(); |
569 | mutex_lock(&online_page_callback_lock); | |
9d0ad8ca DK |
570 | |
571 | if (online_page_callback == generic_online_page) { | |
572 | online_page_callback = callback; | |
573 | rc = 0; | |
574 | } | |
575 | ||
bfc8c901 VD |
576 | mutex_unlock(&online_page_callback_lock); |
577 | put_online_mems(); | |
9d0ad8ca DK |
578 | |
579 | return rc; | |
580 | } | |
581 | EXPORT_SYMBOL_GPL(set_online_page_callback); | |
582 | ||
583 | int restore_online_page_callback(online_page_callback_t callback) | |
584 | { | |
585 | int rc = -EINVAL; | |
586 | ||
bfc8c901 VD |
587 | get_online_mems(); |
588 | mutex_lock(&online_page_callback_lock); | |
9d0ad8ca DK |
589 | |
590 | if (online_page_callback == callback) { | |
591 | online_page_callback = generic_online_page; | |
592 | rc = 0; | |
593 | } | |
594 | ||
bfc8c901 VD |
595 | mutex_unlock(&online_page_callback_lock); |
596 | put_online_mems(); | |
9d0ad8ca DK |
597 | |
598 | return rc; | |
599 | } | |
600 | EXPORT_SYMBOL_GPL(restore_online_page_callback); | |
601 | ||
18db1491 | 602 | void generic_online_page(struct page *page, unsigned int order) |
9d0ad8ca | 603 | { |
c87cbc1f VB |
604 | /* |
605 | * Freeing the page with debug_pagealloc enabled will try to unmap it, | |
606 | * so we should map it first. This is better than introducing a special | |
607 | * case in page freeing fast path. | |
608 | */ | |
609 | if (debug_pagealloc_enabled_static()) | |
610 | kernel_map_pages(page, 1 << order, 1); | |
a9cd410a AK |
611 | __free_pages_core(page, order); |
612 | totalram_pages_add(1UL << order); | |
613 | #ifdef CONFIG_HIGHMEM | |
614 | if (PageHighMem(page)) | |
615 | totalhigh_pages_add(1UL << order); | |
616 | #endif | |
617 | } | |
18db1491 | 618 | EXPORT_SYMBOL_GPL(generic_online_page); |
a9cd410a | 619 | |
75884fb1 KH |
620 | static int online_pages_range(unsigned long start_pfn, unsigned long nr_pages, |
621 | void *arg) | |
3947be19 | 622 | { |
b2c2ab20 DH |
623 | const unsigned long end_pfn = start_pfn + nr_pages; |
624 | unsigned long pfn; | |
625 | int order; | |
626 | ||
627 | /* | |
628 | * Online the pages. The callback might decide to keep some pages | |
629 | * PG_reserved (to add them to the buddy later), but we still account | |
630 | * them as being online/belonging to this zone ("present"). | |
631 | */ | |
632 | for (pfn = start_pfn; pfn < end_pfn; pfn += 1ul << order) { | |
633 | order = min(MAX_ORDER - 1, get_order(PFN_PHYS(end_pfn - pfn))); | |
bd02cc01 DH |
634 | /* __free_pages_core() wants pfns to be aligned to the order */ |
635 | if (WARN_ON_ONCE(!IS_ALIGNED(pfn, 1ul << order))) | |
636 | order = 0; | |
b2c2ab20 DH |
637 | (*online_page_callback)(pfn_to_page(pfn), order); |
638 | } | |
2d070eab | 639 | |
b2c2ab20 DH |
640 | /* mark all involved sections as online */ |
641 | online_mem_sections(start_pfn, end_pfn); | |
2d070eab | 642 | |
b2c2ab20 | 643 | *(unsigned long *)arg += nr_pages; |
75884fb1 KH |
644 | return 0; |
645 | } | |
646 | ||
d9713679 LJ |
647 | /* check which state of node_states will be changed when online memory */ |
648 | static void node_states_check_changes_online(unsigned long nr_pages, | |
649 | struct zone *zone, struct memory_notify *arg) | |
650 | { | |
651 | int nid = zone_to_nid(zone); | |
d9713679 | 652 | |
98fa15f3 AK |
653 | arg->status_change_nid = NUMA_NO_NODE; |
654 | arg->status_change_nid_normal = NUMA_NO_NODE; | |
655 | arg->status_change_nid_high = NUMA_NO_NODE; | |
d9713679 | 656 | |
8efe33f4 OS |
657 | if (!node_state(nid, N_MEMORY)) |
658 | arg->status_change_nid = nid; | |
659 | if (zone_idx(zone) <= ZONE_NORMAL && !node_state(nid, N_NORMAL_MEMORY)) | |
d9713679 | 660 | arg->status_change_nid_normal = nid; |
6715ddf9 | 661 | #ifdef CONFIG_HIGHMEM |
d3ba3ae1 | 662 | if (zone_idx(zone) <= ZONE_HIGHMEM && !node_state(nid, N_HIGH_MEMORY)) |
6715ddf9 | 663 | arg->status_change_nid_high = nid; |
6715ddf9 | 664 | #endif |
d9713679 LJ |
665 | } |
666 | ||
667 | static void node_states_set_node(int node, struct memory_notify *arg) | |
668 | { | |
669 | if (arg->status_change_nid_normal >= 0) | |
670 | node_set_state(node, N_NORMAL_MEMORY); | |
671 | ||
6715ddf9 LJ |
672 | if (arg->status_change_nid_high >= 0) |
673 | node_set_state(node, N_HIGH_MEMORY); | |
674 | ||
83d83612 OS |
675 | if (arg->status_change_nid >= 0) |
676 | node_set_state(node, N_MEMORY); | |
d9713679 LJ |
677 | } |
678 | ||
f1dd2cd1 MH |
679 | static void __meminit resize_zone_range(struct zone *zone, unsigned long start_pfn, |
680 | unsigned long nr_pages) | |
681 | { | |
682 | unsigned long old_end_pfn = zone_end_pfn(zone); | |
683 | ||
684 | if (zone_is_empty(zone) || start_pfn < zone->zone_start_pfn) | |
685 | zone->zone_start_pfn = start_pfn; | |
686 | ||
687 | zone->spanned_pages = max(start_pfn + nr_pages, old_end_pfn) - zone->zone_start_pfn; | |
688 | } | |
689 | ||
690 | static void __meminit resize_pgdat_range(struct pglist_data *pgdat, unsigned long start_pfn, | |
691 | unsigned long nr_pages) | |
692 | { | |
693 | unsigned long old_end_pfn = pgdat_end_pfn(pgdat); | |
694 | ||
695 | if (!pgdat->node_spanned_pages || start_pfn < pgdat->node_start_pfn) | |
696 | pgdat->node_start_pfn = start_pfn; | |
697 | ||
698 | pgdat->node_spanned_pages = max(start_pfn + nr_pages, old_end_pfn) - pgdat->node_start_pfn; | |
f1dd2cd1 | 699 | |
3fccb74c DH |
700 | } |
701 | /* | |
702 | * Associate the pfn range with the given zone, initializing the memmaps | |
703 | * and resizing the pgdat/zone data to span the added pages. After this | |
704 | * call, all affected pages are PG_reserved. | |
705 | */ | |
a99583e7 CH |
706 | void __ref move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn, |
707 | unsigned long nr_pages, struct vmem_altmap *altmap) | |
f1dd2cd1 MH |
708 | { |
709 | struct pglist_data *pgdat = zone->zone_pgdat; | |
710 | int nid = pgdat->node_id; | |
711 | unsigned long flags; | |
df429ac0 | 712 | |
f1dd2cd1 MH |
713 | clear_zone_contiguous(zone); |
714 | ||
715 | /* TODO Huh pgdat is irqsave while zone is not. It used to be like that before */ | |
716 | pgdat_resize_lock(pgdat, &flags); | |
717 | zone_span_writelock(zone); | |
fa004ab7 WY |
718 | if (zone_is_empty(zone)) |
719 | init_currently_empty_zone(zone, start_pfn, nr_pages); | |
f1dd2cd1 MH |
720 | resize_zone_range(zone, start_pfn, nr_pages); |
721 | zone_span_writeunlock(zone); | |
722 | resize_pgdat_range(pgdat, start_pfn, nr_pages); | |
723 | pgdat_resize_unlock(pgdat, &flags); | |
724 | ||
725 | /* | |
726 | * TODO now we have a visible range of pages which are not associated | |
727 | * with their zone properly. Not nice but set_pfnblock_flags_mask | |
728 | * expects the zone spans the pfn range. All the pages in the range | |
729 | * are reserved so nobody should be touching them so we should be safe | |
730 | */ | |
a99583e7 | 731 | memmap_init_zone(nr_pages, nid, zone_idx(zone), start_pfn, |
c1d0da83 | 732 | MEMINIT_HOTPLUG, altmap); |
f1dd2cd1 MH |
733 | |
734 | set_zone_contiguous(zone); | |
735 | } | |
736 | ||
c246a213 MH |
737 | /* |
738 | * Returns a default kernel memory zone for the given pfn range. | |
739 | * If no kernel zone covers this pfn range it will automatically go | |
740 | * to the ZONE_NORMAL. | |
741 | */ | |
c6f03e29 | 742 | static struct zone *default_kernel_zone_for_pfn(int nid, unsigned long start_pfn, |
c246a213 MH |
743 | unsigned long nr_pages) |
744 | { | |
745 | struct pglist_data *pgdat = NODE_DATA(nid); | |
746 | int zid; | |
747 | ||
748 | for (zid = 0; zid <= ZONE_NORMAL; zid++) { | |
749 | struct zone *zone = &pgdat->node_zones[zid]; | |
750 | ||
751 | if (zone_intersects(zone, start_pfn, nr_pages)) | |
752 | return zone; | |
753 | } | |
754 | ||
755 | return &pgdat->node_zones[ZONE_NORMAL]; | |
756 | } | |
757 | ||
c6f03e29 MH |
758 | static inline struct zone *default_zone_for_pfn(int nid, unsigned long start_pfn, |
759 | unsigned long nr_pages) | |
e5e68930 | 760 | { |
c6f03e29 MH |
761 | struct zone *kernel_zone = default_kernel_zone_for_pfn(nid, start_pfn, |
762 | nr_pages); | |
763 | struct zone *movable_zone = &NODE_DATA(nid)->node_zones[ZONE_MOVABLE]; | |
764 | bool in_kernel = zone_intersects(kernel_zone, start_pfn, nr_pages); | |
765 | bool in_movable = zone_intersects(movable_zone, start_pfn, nr_pages); | |
e5e68930 MH |
766 | |
767 | /* | |
c6f03e29 MH |
768 | * We inherit the existing zone in a simple case where zones do not |
769 | * overlap in the given range | |
e5e68930 | 770 | */ |
c6f03e29 MH |
771 | if (in_kernel ^ in_movable) |
772 | return (in_kernel) ? kernel_zone : movable_zone; | |
9f123ab5 | 773 | |
c6f03e29 MH |
774 | /* |
775 | * If the range doesn't belong to any zone or two zones overlap in the | |
776 | * given range then we use movable zone only if movable_node is | |
777 | * enabled because we always online to a kernel zone by default. | |
778 | */ | |
779 | return movable_node_enabled ? movable_zone : kernel_zone; | |
9f123ab5 MH |
780 | } |
781 | ||
e5e68930 MH |
782 | struct zone * zone_for_pfn_range(int online_type, int nid, unsigned start_pfn, |
783 | unsigned long nr_pages) | |
f1dd2cd1 | 784 | { |
c6f03e29 MH |
785 | if (online_type == MMOP_ONLINE_KERNEL) |
786 | return default_kernel_zone_for_pfn(nid, start_pfn, nr_pages); | |
f1dd2cd1 | 787 | |
c6f03e29 MH |
788 | if (online_type == MMOP_ONLINE_MOVABLE) |
789 | return &NODE_DATA(nid)->node_zones[ZONE_MOVABLE]; | |
df429ac0 | 790 | |
c6f03e29 | 791 | return default_zone_for_pfn(nid, start_pfn, nr_pages); |
e5e68930 MH |
792 | } |
793 | ||
bd5c2344 DH |
794 | int __ref online_pages(unsigned long pfn, unsigned long nr_pages, |
795 | int online_type, int nid) | |
75884fb1 | 796 | { |
aa47228a | 797 | unsigned long flags; |
3947be19 DH |
798 | unsigned long onlined_pages = 0; |
799 | struct zone *zone; | |
6811378e | 800 | int need_zonelists_rebuild = 0; |
7b78d335 YG |
801 | int ret; |
802 | struct memory_notify arg; | |
d0dc12e8 | 803 | |
381eab4a DH |
804 | mem_hotplug_begin(); |
805 | ||
f1dd2cd1 | 806 | /* associate pfn range with the zone */ |
3fccb74c DH |
807 | zone = zone_for_pfn_range(online_type, nid, pfn, nr_pages); |
808 | move_pfn_range_to_zone(zone, pfn, nr_pages, NULL); | |
f1dd2cd1 | 809 | |
7b78d335 YG |
810 | arg.start_pfn = pfn; |
811 | arg.nr_pages = nr_pages; | |
d9713679 | 812 | node_states_check_changes_online(nr_pages, zone, &arg); |
7b78d335 | 813 | |
7b78d335 YG |
814 | ret = memory_notify(MEM_GOING_ONLINE, &arg); |
815 | ret = notifier_to_errno(ret); | |
e33e33b4 CY |
816 | if (ret) |
817 | goto failed_addition; | |
818 | ||
6811378e YG |
819 | /* |
820 | * If this zone is not populated, then it is not in zonelist. | |
821 | * This means the page allocator ignores this zone. | |
822 | * So, zonelist must be updated after online. | |
823 | */ | |
6dcd73d7 | 824 | if (!populated_zone(zone)) { |
6811378e | 825 | need_zonelists_rebuild = 1; |
72675e13 | 826 | setup_zone_pageset(zone); |
6dcd73d7 | 827 | } |
6811378e | 828 | |
908eedc6 | 829 | ret = walk_system_ram_range(pfn, nr_pages, &onlined_pages, |
75884fb1 | 830 | online_pages_range); |
fd8a4221 | 831 | if (ret) { |
ca9a46f8 | 832 | /* not a single memory resource was applicable */ |
6dcd73d7 WC |
833 | if (need_zonelists_rebuild) |
834 | zone_pcp_reset(zone); | |
e33e33b4 | 835 | goto failed_addition; |
fd8a4221 GL |
836 | } |
837 | ||
3947be19 | 838 | zone->present_pages += onlined_pages; |
aa47228a CS |
839 | |
840 | pgdat_resize_lock(zone->zone_pgdat, &flags); | |
f2937be5 | 841 | zone->zone_pgdat->node_present_pages += onlined_pages; |
aa47228a CS |
842 | pgdat_resize_unlock(zone->zone_pgdat, &flags); |
843 | ||
93146d98 DH |
844 | /* |
845 | * When exposing larger, physically contiguous memory areas to the | |
846 | * buddy, shuffling in the buddy (when freeing onlined pages, putting | |
847 | * them either to the head or the tail of the freelist) is only helpful | |
848 | * for maintaining the shuffle, but not for creating the initial | |
849 | * shuffle. Shuffle the whole zone to make sure the just onlined pages | |
850 | * are properly distributed across the whole freelist. | |
851 | */ | |
e900a918 DW |
852 | shuffle_zone(zone); |
853 | ||
ca9a46f8 DH |
854 | node_states_set_node(nid, &arg); |
855 | if (need_zonelists_rebuild) | |
856 | build_all_zonelists(NULL); | |
de1193f0 | 857 | zone_pcp_update(zone); |
3947be19 | 858 | |
1b79acc9 KM |
859 | init_per_zone_wmark_min(); |
860 | ||
ca9a46f8 DH |
861 | kswapd_run(nid); |
862 | kcompactd_run(nid); | |
61b13993 | 863 | |
2d1d43f6 | 864 | writeback_set_ratelimit(); |
7b78d335 | 865 | |
ca9a46f8 | 866 | memory_notify(MEM_ONLINE, &arg); |
381eab4a | 867 | mem_hotplug_done(); |
30467e0b | 868 | return 0; |
e33e33b4 CY |
869 | |
870 | failed_addition: | |
871 | pr_debug("online_pages [mem %#010llx-%#010llx] failed\n", | |
872 | (unsigned long long) pfn << PAGE_SHIFT, | |
873 | (((unsigned long long) pfn + nr_pages) << PAGE_SHIFT) - 1); | |
874 | memory_notify(MEM_CANCEL_ONLINE, &arg); | |
feee6b29 | 875 | remove_pfn_range_from_zone(zone, pfn, nr_pages); |
381eab4a | 876 | mem_hotplug_done(); |
e33e33b4 | 877 | return ret; |
3947be19 | 878 | } |
53947027 | 879 | #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ |
bc02af93 | 880 | |
0bd85420 TC |
881 | static void reset_node_present_pages(pg_data_t *pgdat) |
882 | { | |
883 | struct zone *z; | |
884 | ||
885 | for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++) | |
886 | z->present_pages = 0; | |
887 | ||
888 | pgdat->node_present_pages = 0; | |
889 | } | |
890 | ||
e1319331 | 891 | /* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */ |
c68ab18c | 892 | static pg_data_t __ref *hotadd_new_pgdat(int nid) |
9af3c2de YG |
893 | { |
894 | struct pglist_data *pgdat; | |
9af3c2de | 895 | |
a1e565aa TC |
896 | pgdat = NODE_DATA(nid); |
897 | if (!pgdat) { | |
898 | pgdat = arch_alloc_nodedata(nid); | |
899 | if (!pgdat) | |
900 | return NULL; | |
9af3c2de | 901 | |
33fce011 WY |
902 | pgdat->per_cpu_nodestats = |
903 | alloc_percpu(struct per_cpu_nodestat); | |
a1e565aa | 904 | arch_refresh_nodedata(nid, pgdat); |
b0dc3a34 | 905 | } else { |
33fce011 | 906 | int cpu; |
e716f2eb | 907 | /* |
97a225e6 JK |
908 | * Reset the nr_zones, order and highest_zoneidx before reuse. |
909 | * Note that kswapd will init kswapd_highest_zoneidx properly | |
e716f2eb MG |
910 | * when it starts in the near future. |
911 | */ | |
b0dc3a34 | 912 | pgdat->nr_zones = 0; |
38087d9b | 913 | pgdat->kswapd_order = 0; |
97a225e6 | 914 | pgdat->kswapd_highest_zoneidx = 0; |
33fce011 WY |
915 | for_each_online_cpu(cpu) { |
916 | struct per_cpu_nodestat *p; | |
917 | ||
918 | p = per_cpu_ptr(pgdat->per_cpu_nodestats, cpu); | |
919 | memset(p, 0, sizeof(*p)); | |
920 | } | |
a1e565aa | 921 | } |
9af3c2de YG |
922 | |
923 | /* we can use NODE_DATA(nid) from here */ | |
03e85f9d | 924 | pgdat->node_id = nid; |
c68ab18c | 925 | pgdat->node_start_pfn = 0; |
03e85f9d | 926 | |
9af3c2de | 927 | /* init node's zones as empty zones, we don't have any present pages.*/ |
03e85f9d | 928 | free_area_init_core_hotplug(nid); |
9af3c2de | 929 | |
959ecc48 KH |
930 | /* |
931 | * The node we allocated has no zone fallback lists. For avoiding | |
932 | * to access not-initialized zonelist, build here. | |
933 | */ | |
72675e13 | 934 | build_all_zonelists(pgdat); |
959ecc48 | 935 | |
0bd85420 TC |
936 | /* |
937 | * When memory is hot-added, all the memory is in offline state. So | |
938 | * clear all zones' present_pages because they will be updated in | |
939 | * online_pages() and offline_pages(). | |
940 | */ | |
03e85f9d | 941 | reset_node_managed_pages(pgdat); |
0bd85420 TC |
942 | reset_node_present_pages(pgdat); |
943 | ||
9af3c2de YG |
944 | return pgdat; |
945 | } | |
946 | ||
b9ff0360 | 947 | static void rollback_node_hotadd(int nid) |
9af3c2de | 948 | { |
b9ff0360 OS |
949 | pg_data_t *pgdat = NODE_DATA(nid); |
950 | ||
9af3c2de | 951 | arch_refresh_nodedata(nid, NULL); |
5830169f | 952 | free_percpu(pgdat->per_cpu_nodestats); |
9af3c2de | 953 | arch_free_nodedata(pgdat); |
9af3c2de YG |
954 | } |
955 | ||
0a547039 | 956 | |
01b0f197 TK |
957 | /** |
958 | * try_online_node - online a node if offlined | |
e8b098fc | 959 | * @nid: the node ID |
b9ff0360 | 960 | * @set_node_online: Whether we want to online the node |
cf23422b | 961 | * called by cpu_up() to online a node without onlined memory. |
b9ff0360 OS |
962 | * |
963 | * Returns: | |
964 | * 1 -> a new node has been allocated | |
965 | * 0 -> the node is already online | |
966 | * -ENOMEM -> the node could not be allocated | |
cf23422b | 967 | */ |
c68ab18c | 968 | static int __try_online_node(int nid, bool set_node_online) |
cf23422b | 969 | { |
b9ff0360 OS |
970 | pg_data_t *pgdat; |
971 | int ret = 1; | |
cf23422b | 972 | |
01b0f197 TK |
973 | if (node_online(nid)) |
974 | return 0; | |
975 | ||
c68ab18c | 976 | pgdat = hotadd_new_pgdat(nid); |
7553e8f2 | 977 | if (!pgdat) { |
01b0f197 | 978 | pr_err("Cannot online node %d due to NULL pgdat\n", nid); |
cf23422b | 979 | ret = -ENOMEM; |
980 | goto out; | |
981 | } | |
b9ff0360 OS |
982 | |
983 | if (set_node_online) { | |
984 | node_set_online(nid); | |
985 | ret = register_one_node(nid); | |
986 | BUG_ON(ret); | |
987 | } | |
cf23422b | 988 | out: |
b9ff0360 OS |
989 | return ret; |
990 | } | |
991 | ||
992 | /* | |
993 | * Users of this function always want to online/register the node | |
994 | */ | |
995 | int try_online_node(int nid) | |
996 | { | |
997 | int ret; | |
998 | ||
999 | mem_hotplug_begin(); | |
c68ab18c | 1000 | ret = __try_online_node(nid, true); |
bfc8c901 | 1001 | mem_hotplug_done(); |
cf23422b | 1002 | return ret; |
1003 | } | |
1004 | ||
27356f54 TK |
1005 | static int check_hotplug_memory_range(u64 start, u64 size) |
1006 | { | |
ba325585 | 1007 | /* memory range must be block size aligned */ |
cec3ebd0 DH |
1008 | if (!size || !IS_ALIGNED(start, memory_block_size_bytes()) || |
1009 | !IS_ALIGNED(size, memory_block_size_bytes())) { | |
ba325585 | 1010 | pr_err("Block size [%#lx] unaligned hotplug range: start %#llx, size %#llx", |
cec3ebd0 | 1011 | memory_block_size_bytes(), start, size); |
27356f54 TK |
1012 | return -EINVAL; |
1013 | } | |
1014 | ||
1015 | return 0; | |
1016 | } | |
1017 | ||
31bc3858 VK |
1018 | static int online_memory_block(struct memory_block *mem, void *arg) |
1019 | { | |
862919e5 | 1020 | mem->online_type = memhp_default_online_type; |
dc18d706 | 1021 | return device_online(&mem->dev); |
31bc3858 VK |
1022 | } |
1023 | ||
8df1d0e4 DH |
1024 | /* |
1025 | * NOTE: The caller must call lock_device_hotplug() to serialize hotplug | |
1026 | * and online/offline operations (triggered e.g. by sysfs). | |
1027 | * | |
1028 | * we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG | |
1029 | */ | |
f29d8e9c | 1030 | int __ref add_memory_resource(int nid, struct resource *res) |
bc02af93 | 1031 | { |
bfeb022f | 1032 | struct mhp_params params = { .pgprot = PAGE_KERNEL }; |
62cedb9f | 1033 | u64 start, size; |
b9ff0360 | 1034 | bool new_node = false; |
bc02af93 YG |
1035 | int ret; |
1036 | ||
62cedb9f DV |
1037 | start = res->start; |
1038 | size = resource_size(res); | |
1039 | ||
27356f54 TK |
1040 | ret = check_hotplug_memory_range(start, size); |
1041 | if (ret) | |
1042 | return ret; | |
1043 | ||
fa6d9ec7 VV |
1044 | if (!node_possible(nid)) { |
1045 | WARN(1, "node %d was absent from the node_possible_map\n", nid); | |
1046 | return -EINVAL; | |
1047 | } | |
1048 | ||
bfc8c901 | 1049 | mem_hotplug_begin(); |
ac13c462 | 1050 | |
52219aea DH |
1051 | if (IS_ENABLED(CONFIG_ARCH_KEEP_MEMBLOCK)) |
1052 | memblock_add_node(start, size, nid); | |
7f36e3e5 | 1053 | |
c68ab18c | 1054 | ret = __try_online_node(nid, false); |
b9ff0360 OS |
1055 | if (ret < 0) |
1056 | goto error; | |
1057 | new_node = ret; | |
9af3c2de | 1058 | |
bc02af93 | 1059 | /* call arch's memory hotadd */ |
f5637d3b | 1060 | ret = arch_add_memory(nid, start, size, ¶ms); |
9af3c2de YG |
1061 | if (ret < 0) |
1062 | goto error; | |
1063 | ||
db051a0d DH |
1064 | /* create memory block devices after memory was added */ |
1065 | ret = create_memory_block_devices(start, size); | |
1066 | if (ret) { | |
1067 | arch_remove_memory(nid, start, size, NULL); | |
1068 | goto error; | |
1069 | } | |
1070 | ||
a1e565aa | 1071 | if (new_node) { |
d5b6f6a3 | 1072 | /* If sysfs file of new node can't be created, cpu on the node |
0fc44159 YG |
1073 | * can't be hot-added. There is no rollback way now. |
1074 | * So, check by BUG_ON() to catch it reluctantly.. | |
d5b6f6a3 | 1075 | * We online node here. We can't roll back from here. |
0fc44159 | 1076 | */ |
d5b6f6a3 OS |
1077 | node_set_online(nid); |
1078 | ret = __register_one_node(nid); | |
0fc44159 YG |
1079 | BUG_ON(ret); |
1080 | } | |
1081 | ||
d5b6f6a3 | 1082 | /* link memory sections under this node.*/ |
f85086f9 LD |
1083 | ret = link_mem_sections(nid, PFN_DOWN(start), PFN_UP(start + size - 1), |
1084 | MEMINIT_HOTPLUG); | |
d5b6f6a3 OS |
1085 | BUG_ON(ret); |
1086 | ||
d96ae530 | 1087 | /* create new memmap entry */ |
7b7b2721 DH |
1088 | if (!strcmp(res->name, "System RAM")) |
1089 | firmware_map_add_hotplug(start, start + size, "System RAM"); | |
d96ae530 | 1090 | |
381eab4a DH |
1091 | /* device_online() will take the lock when calling online_pages() */ |
1092 | mem_hotplug_done(); | |
1093 | ||
31bc3858 | 1094 | /* online pages if requested */ |
862919e5 | 1095 | if (memhp_default_online_type != MMOP_OFFLINE) |
fbcf73ce | 1096 | walk_memory_blocks(start, size, NULL, online_memory_block); |
31bc3858 | 1097 | |
381eab4a | 1098 | return ret; |
9af3c2de YG |
1099 | error: |
1100 | /* rollback pgdat allocation and others */ | |
b9ff0360 OS |
1101 | if (new_node) |
1102 | rollback_node_hotadd(nid); | |
52219aea DH |
1103 | if (IS_ENABLED(CONFIG_ARCH_KEEP_MEMBLOCK)) |
1104 | memblock_remove(start, size); | |
bfc8c901 | 1105 | mem_hotplug_done(); |
bc02af93 YG |
1106 | return ret; |
1107 | } | |
62cedb9f | 1108 | |
8df1d0e4 DH |
1109 | /* requires device_hotplug_lock, see add_memory_resource() */ |
1110 | int __ref __add_memory(int nid, u64 start, u64 size) | |
62cedb9f DV |
1111 | { |
1112 | struct resource *res; | |
1113 | int ret; | |
1114 | ||
7b7b2721 | 1115 | res = register_memory_resource(start, size, "System RAM"); |
6f754ba4 VK |
1116 | if (IS_ERR(res)) |
1117 | return PTR_ERR(res); | |
62cedb9f | 1118 | |
f29d8e9c | 1119 | ret = add_memory_resource(nid, res); |
62cedb9f DV |
1120 | if (ret < 0) |
1121 | release_memory_resource(res); | |
1122 | return ret; | |
1123 | } | |
8df1d0e4 DH |
1124 | |
1125 | int add_memory(int nid, u64 start, u64 size) | |
1126 | { | |
1127 | int rc; | |
1128 | ||
1129 | lock_device_hotplug(); | |
1130 | rc = __add_memory(nid, start, size); | |
1131 | unlock_device_hotplug(); | |
1132 | ||
1133 | return rc; | |
1134 | } | |
bc02af93 | 1135 | EXPORT_SYMBOL_GPL(add_memory); |
0c0e6195 | 1136 | |
7b7b2721 DH |
1137 | /* |
1138 | * Add special, driver-managed memory to the system as system RAM. Such | |
1139 | * memory is not exposed via the raw firmware-provided memmap as system | |
1140 | * RAM, instead, it is detected and added by a driver - during cold boot, | |
1141 | * after a reboot, and after kexec. | |
1142 | * | |
1143 | * Reasons why this memory should not be used for the initial memmap of a | |
1144 | * kexec kernel or for placing kexec images: | |
1145 | * - The booting kernel is in charge of determining how this memory will be | |
1146 | * used (e.g., use persistent memory as system RAM) | |
1147 | * - Coordination with a hypervisor is required before this memory | |
1148 | * can be used (e.g., inaccessible parts). | |
1149 | * | |
1150 | * For this memory, no entries in /sys/firmware/memmap ("raw firmware-provided | |
1151 | * memory map") are created. Also, the created memory resource is flagged | |
1152 | * with IORESOURCE_MEM_DRIVER_MANAGED, so in-kernel users can special-case | |
1153 | * this memory as well (esp., not place kexec images onto it). | |
1154 | * | |
1155 | * The resource_name (visible via /proc/iomem) has to have the format | |
1156 | * "System RAM ($DRIVER)". | |
1157 | */ | |
1158 | int add_memory_driver_managed(int nid, u64 start, u64 size, | |
1159 | const char *resource_name) | |
1160 | { | |
1161 | struct resource *res; | |
1162 | int rc; | |
1163 | ||
1164 | if (!resource_name || | |
1165 | strstr(resource_name, "System RAM (") != resource_name || | |
1166 | resource_name[strlen(resource_name) - 1] != ')') | |
1167 | return -EINVAL; | |
1168 | ||
1169 | lock_device_hotplug(); | |
1170 | ||
1171 | res = register_memory_resource(start, size, resource_name); | |
1172 | if (IS_ERR(res)) { | |
1173 | rc = PTR_ERR(res); | |
1174 | goto out_unlock; | |
1175 | } | |
1176 | ||
1177 | rc = add_memory_resource(nid, res); | |
1178 | if (rc < 0) | |
1179 | release_memory_resource(res); | |
1180 | ||
1181 | out_unlock: | |
1182 | unlock_device_hotplug(); | |
1183 | return rc; | |
1184 | } | |
1185 | EXPORT_SYMBOL_GPL(add_memory_driver_managed); | |
1186 | ||
0c0e6195 KH |
1187 | #ifdef CONFIG_MEMORY_HOTREMOVE |
1188 | /* | |
92917998 DH |
1189 | * Confirm all pages in a range [start, end) belong to the same zone (skipping |
1190 | * memory holes). When true, return the zone. | |
0c0e6195 | 1191 | */ |
92917998 DH |
1192 | struct zone *test_pages_in_a_zone(unsigned long start_pfn, |
1193 | unsigned long end_pfn) | |
0c0e6195 | 1194 | { |
5f0f2887 | 1195 | unsigned long pfn, sec_end_pfn; |
0c0e6195 KH |
1196 | struct zone *zone = NULL; |
1197 | struct page *page; | |
1198 | int i; | |
deb88a2a | 1199 | for (pfn = start_pfn, sec_end_pfn = SECTION_ALIGN_UP(start_pfn + 1); |
0c0e6195 | 1200 | pfn < end_pfn; |
deb88a2a | 1201 | pfn = sec_end_pfn, sec_end_pfn += PAGES_PER_SECTION) { |
5f0f2887 AB |
1202 | /* Make sure the memory section is present first */ |
1203 | if (!present_section_nr(pfn_to_section_nr(pfn))) | |
0c0e6195 | 1204 | continue; |
5f0f2887 AB |
1205 | for (; pfn < sec_end_pfn && pfn < end_pfn; |
1206 | pfn += MAX_ORDER_NR_PAGES) { | |
1207 | i = 0; | |
1208 | /* This is just a CONFIG_HOLES_IN_ZONE check.*/ | |
1209 | while ((i < MAX_ORDER_NR_PAGES) && | |
1210 | !pfn_valid_within(pfn + i)) | |
1211 | i++; | |
d6d8c8a4 | 1212 | if (i == MAX_ORDER_NR_PAGES || pfn + i >= end_pfn) |
5f0f2887 | 1213 | continue; |
24feb47c MZ |
1214 | /* Check if we got outside of the zone */ |
1215 | if (zone && !zone_spans_pfn(zone, pfn + i)) | |
92917998 | 1216 | return NULL; |
5f0f2887 AB |
1217 | page = pfn_to_page(pfn + i); |
1218 | if (zone && page_zone(page) != zone) | |
92917998 | 1219 | return NULL; |
5f0f2887 AB |
1220 | zone = page_zone(page); |
1221 | } | |
0c0e6195 | 1222 | } |
deb88a2a | 1223 | |
92917998 | 1224 | return zone; |
0c0e6195 KH |
1225 | } |
1226 | ||
1227 | /* | |
0efadf48 | 1228 | * Scan pfn range [start,end) to find movable/migratable pages (LRU pages, |
aa218795 DH |
1229 | * non-lru movable pages and hugepages). Will skip over most unmovable |
1230 | * pages (esp., pages that can be skipped when offlining), but bail out on | |
1231 | * definitely unmovable pages. | |
1232 | * | |
1233 | * Returns: | |
1234 | * 0 in case a movable page is found and movable_pfn was updated. | |
1235 | * -ENOENT in case no movable page was found. | |
1236 | * -EBUSY in case a definitely unmovable page was found. | |
0c0e6195 | 1237 | */ |
aa218795 DH |
1238 | static int scan_movable_pages(unsigned long start, unsigned long end, |
1239 | unsigned long *movable_pfn) | |
0c0e6195 KH |
1240 | { |
1241 | unsigned long pfn; | |
eeb0efd0 | 1242 | |
0c0e6195 | 1243 | for (pfn = start; pfn < end; pfn++) { |
eeb0efd0 OS |
1244 | struct page *page, *head; |
1245 | unsigned long skip; | |
1246 | ||
1247 | if (!pfn_valid(pfn)) | |
1248 | continue; | |
1249 | page = pfn_to_page(pfn); | |
1250 | if (PageLRU(page)) | |
aa218795 | 1251 | goto found; |
eeb0efd0 | 1252 | if (__PageMovable(page)) |
aa218795 DH |
1253 | goto found; |
1254 | ||
1255 | /* | |
1256 | * PageOffline() pages that are not marked __PageMovable() and | |
1257 | * have a reference count > 0 (after MEM_GOING_OFFLINE) are | |
1258 | * definitely unmovable. If their reference count would be 0, | |
1259 | * they could at least be skipped when offlining memory. | |
1260 | */ | |
1261 | if (PageOffline(page) && page_count(page)) | |
1262 | return -EBUSY; | |
eeb0efd0 OS |
1263 | |
1264 | if (!PageHuge(page)) | |
1265 | continue; | |
1266 | head = compound_head(page); | |
39186cbe | 1267 | if (page_huge_active(head)) |
aa218795 | 1268 | goto found; |
d8c6546b | 1269 | skip = compound_nr(head) - (page - head); |
eeb0efd0 | 1270 | pfn += skip - 1; |
0c0e6195 | 1271 | } |
aa218795 DH |
1272 | return -ENOENT; |
1273 | found: | |
1274 | *movable_pfn = pfn; | |
0c0e6195 KH |
1275 | return 0; |
1276 | } | |
1277 | ||
666feb21 | 1278 | static struct page *new_node_page(struct page *page, unsigned long private) |
394e31d2 | 1279 | { |
231e97e2 | 1280 | nodemask_t nmask = node_states[N_MEMORY]; |
19fc7bed JK |
1281 | struct migration_target_control mtc = { |
1282 | .nid = page_to_nid(page), | |
1283 | .nmask = &nmask, | |
1284 | .gfp_mask = GFP_USER | __GFP_MOVABLE | __GFP_RETRY_MAYFAIL, | |
1285 | }; | |
7f252f27 MH |
1286 | |
1287 | /* | |
1288 | * try to allocate from a different node but reuse this node if there | |
1289 | * are no other online nodes to be used (e.g. we are offlining a part | |
1290 | * of the only existing node) | |
1291 | */ | |
19fc7bed | 1292 | node_clear(mtc.nid, nmask); |
7f252f27 | 1293 | if (nodes_empty(nmask)) |
19fc7bed | 1294 | node_set(mtc.nid, nmask); |
394e31d2 | 1295 | |
19fc7bed | 1296 | return alloc_migration_target(page, (unsigned long)&mtc); |
394e31d2 XQ |
1297 | } |
1298 | ||
0c0e6195 KH |
1299 | static int |
1300 | do_migrate_range(unsigned long start_pfn, unsigned long end_pfn) | |
1301 | { | |
1302 | unsigned long pfn; | |
6c357848 | 1303 | struct page *page, *head; |
0c0e6195 KH |
1304 | int ret = 0; |
1305 | LIST_HEAD(source); | |
1306 | ||
a85009c3 | 1307 | for (pfn = start_pfn; pfn < end_pfn; pfn++) { |
0c0e6195 KH |
1308 | if (!pfn_valid(pfn)) |
1309 | continue; | |
1310 | page = pfn_to_page(pfn); | |
6c357848 | 1311 | head = compound_head(page); |
c8721bbb NH |
1312 | |
1313 | if (PageHuge(page)) { | |
d8c6546b | 1314 | pfn = page_to_pfn(head) + compound_nr(head) - 1; |
daf3538a | 1315 | isolate_huge_page(head, &source); |
c8721bbb | 1316 | continue; |
94723aaf | 1317 | } else if (PageTransHuge(page)) |
6c357848 | 1318 | pfn = page_to_pfn(head) + thp_nr_pages(page) - 1; |
c8721bbb | 1319 | |
b15c8726 MH |
1320 | /* |
1321 | * HWPoison pages have elevated reference counts so the migration would | |
1322 | * fail on them. It also doesn't make any sense to migrate them in the | |
1323 | * first place. Still try to unmap such a page in case it is still mapped | |
1324 | * (e.g. current hwpoison implementation doesn't unmap KSM pages but keep | |
1325 | * the unmap as the catch all safety net). | |
1326 | */ | |
1327 | if (PageHWPoison(page)) { | |
1328 | if (WARN_ON(PageLRU(page))) | |
1329 | isolate_lru_page(page); | |
1330 | if (page_mapped(page)) | |
1331 | try_to_unmap(page, TTU_IGNORE_MLOCK | TTU_IGNORE_ACCESS); | |
1332 | continue; | |
1333 | } | |
1334 | ||
700c2a46 | 1335 | if (!get_page_unless_zero(page)) |
0c0e6195 KH |
1336 | continue; |
1337 | /* | |
0efadf48 YX |
1338 | * We can skip free pages. And we can deal with pages on |
1339 | * LRU and non-lru movable pages. | |
0c0e6195 | 1340 | */ |
0efadf48 YX |
1341 | if (PageLRU(page)) |
1342 | ret = isolate_lru_page(page); | |
1343 | else | |
1344 | ret = isolate_movable_page(page, ISOLATE_UNEVICTABLE); | |
0c0e6195 | 1345 | if (!ret) { /* Success */ |
62695a84 | 1346 | list_add_tail(&page->lru, &source); |
0efadf48 YX |
1347 | if (!__PageMovable(page)) |
1348 | inc_node_page_state(page, NR_ISOLATED_ANON + | |
9de4f22a | 1349 | page_is_file_lru(page)); |
6d9c285a | 1350 | |
0c0e6195 | 1351 | } else { |
2932c8b0 | 1352 | pr_warn("failed to isolate pfn %lx\n", pfn); |
0efadf48 | 1353 | dump_page(page, "isolation failed"); |
0c0e6195 | 1354 | } |
1723058e | 1355 | put_page(page); |
0c0e6195 | 1356 | } |
f3ab2636 | 1357 | if (!list_empty(&source)) { |
394e31d2 XQ |
1358 | /* Allocate a new page from the nearest neighbor node */ |
1359 | ret = migrate_pages(&source, new_node_page, NULL, 0, | |
9c620e2b | 1360 | MIGRATE_SYNC, MR_MEMORY_HOTPLUG); |
2932c8b0 MH |
1361 | if (ret) { |
1362 | list_for_each_entry(page, &source, lru) { | |
1363 | pr_warn("migrating pfn %lx failed ret:%d ", | |
1364 | page_to_pfn(page), ret); | |
1365 | dump_page(page, "migration failure"); | |
1366 | } | |
c8721bbb | 1367 | putback_movable_pages(&source); |
2932c8b0 | 1368 | } |
0c0e6195 | 1369 | } |
1723058e | 1370 | |
0c0e6195 KH |
1371 | return ret; |
1372 | } | |
1373 | ||
0ee5f4f3 | 1374 | /* Mark all sections offline and remove all free pages from the buddy. */ |
0c0e6195 KH |
1375 | static int |
1376 | offline_isolated_pages_cb(unsigned long start, unsigned long nr_pages, | |
1377 | void *data) | |
1378 | { | |
5557c766 | 1379 | unsigned long *offlined_pages = (unsigned long *)data; |
0c0e6195 | 1380 | |
5557c766 MH |
1381 | *offlined_pages += __offline_isolated_pages(start, start + nr_pages); |
1382 | return 0; | |
0c0e6195 KH |
1383 | } |
1384 | ||
1385 | /* | |
52cfc245 | 1386 | * Check all pages in range, recorded as memory resource, are isolated. |
0c0e6195 KH |
1387 | */ |
1388 | static int | |
1389 | check_pages_isolated_cb(unsigned long start_pfn, unsigned long nr_pages, | |
1390 | void *data) | |
1391 | { | |
756d25be DH |
1392 | return test_pages_isolated(start_pfn, start_pfn + nr_pages, |
1393 | MEMORY_OFFLINE); | |
0c0e6195 KH |
1394 | } |
1395 | ||
c5320926 TC |
1396 | static int __init cmdline_parse_movable_node(char *p) |
1397 | { | |
55ac590c | 1398 | movable_node_enabled = true; |
c5320926 TC |
1399 | return 0; |
1400 | } | |
1401 | early_param("movable_node", cmdline_parse_movable_node); | |
1402 | ||
d9713679 LJ |
1403 | /* check which state of node_states will be changed when offline memory */ |
1404 | static void node_states_check_changes_offline(unsigned long nr_pages, | |
1405 | struct zone *zone, struct memory_notify *arg) | |
1406 | { | |
1407 | struct pglist_data *pgdat = zone->zone_pgdat; | |
1408 | unsigned long present_pages = 0; | |
86b27bea | 1409 | enum zone_type zt; |
d9713679 | 1410 | |
98fa15f3 AK |
1411 | arg->status_change_nid = NUMA_NO_NODE; |
1412 | arg->status_change_nid_normal = NUMA_NO_NODE; | |
1413 | arg->status_change_nid_high = NUMA_NO_NODE; | |
d9713679 LJ |
1414 | |
1415 | /* | |
86b27bea OS |
1416 | * Check whether node_states[N_NORMAL_MEMORY] will be changed. |
1417 | * If the memory to be offline is within the range | |
1418 | * [0..ZONE_NORMAL], and it is the last present memory there, | |
1419 | * the zones in that range will become empty after the offlining, | |
1420 | * thus we can determine that we need to clear the node from | |
1421 | * node_states[N_NORMAL_MEMORY]. | |
d9713679 | 1422 | */ |
86b27bea | 1423 | for (zt = 0; zt <= ZONE_NORMAL; zt++) |
d9713679 | 1424 | present_pages += pgdat->node_zones[zt].present_pages; |
86b27bea | 1425 | if (zone_idx(zone) <= ZONE_NORMAL && nr_pages >= present_pages) |
d9713679 | 1426 | arg->status_change_nid_normal = zone_to_nid(zone); |
d9713679 | 1427 | |
6715ddf9 LJ |
1428 | #ifdef CONFIG_HIGHMEM |
1429 | /* | |
86b27bea OS |
1430 | * node_states[N_HIGH_MEMORY] contains nodes which |
1431 | * have normal memory or high memory. | |
1432 | * Here we add the present_pages belonging to ZONE_HIGHMEM. | |
1433 | * If the zone is within the range of [0..ZONE_HIGHMEM), and | |
1434 | * we determine that the zones in that range become empty, | |
1435 | * we need to clear the node for N_HIGH_MEMORY. | |
6715ddf9 | 1436 | */ |
86b27bea OS |
1437 | present_pages += pgdat->node_zones[ZONE_HIGHMEM].present_pages; |
1438 | if (zone_idx(zone) <= ZONE_HIGHMEM && nr_pages >= present_pages) | |
6715ddf9 | 1439 | arg->status_change_nid_high = zone_to_nid(zone); |
6715ddf9 LJ |
1440 | #endif |
1441 | ||
d9713679 | 1442 | /* |
86b27bea OS |
1443 | * We have accounted the pages from [0..ZONE_NORMAL), and |
1444 | * in case of CONFIG_HIGHMEM the pages from ZONE_HIGHMEM | |
1445 | * as well. | |
1446 | * Here we count the possible pages from ZONE_MOVABLE. | |
1447 | * If after having accounted all the pages, we see that the nr_pages | |
1448 | * to be offlined is over or equal to the accounted pages, | |
1449 | * we know that the node will become empty, and so, we can clear | |
1450 | * it for N_MEMORY as well. | |
d9713679 | 1451 | */ |
86b27bea | 1452 | present_pages += pgdat->node_zones[ZONE_MOVABLE].present_pages; |
d9713679 | 1453 | |
d9713679 LJ |
1454 | if (nr_pages >= present_pages) |
1455 | arg->status_change_nid = zone_to_nid(zone); | |
d9713679 LJ |
1456 | } |
1457 | ||
1458 | static void node_states_clear_node(int node, struct memory_notify *arg) | |
1459 | { | |
1460 | if (arg->status_change_nid_normal >= 0) | |
1461 | node_clear_state(node, N_NORMAL_MEMORY); | |
1462 | ||
cf01f6f5 | 1463 | if (arg->status_change_nid_high >= 0) |
d9713679 | 1464 | node_clear_state(node, N_HIGH_MEMORY); |
6715ddf9 | 1465 | |
cf01f6f5 | 1466 | if (arg->status_change_nid >= 0) |
6715ddf9 | 1467 | node_clear_state(node, N_MEMORY); |
d9713679 LJ |
1468 | } |
1469 | ||
c5e79ef5 DH |
1470 | static int count_system_ram_pages_cb(unsigned long start_pfn, |
1471 | unsigned long nr_pages, void *data) | |
1472 | { | |
1473 | unsigned long *nr_system_ram_pages = data; | |
1474 | ||
1475 | *nr_system_ram_pages += nr_pages; | |
1476 | return 0; | |
1477 | } | |
1478 | ||
a16cee10 | 1479 | static int __ref __offline_pages(unsigned long start_pfn, |
ecde0f3e | 1480 | unsigned long end_pfn) |
0c0e6195 | 1481 | { |
c5e79ef5 | 1482 | unsigned long pfn, nr_pages = 0; |
5557c766 | 1483 | unsigned long offlined_pages = 0; |
9b7ea46a | 1484 | int ret, node, nr_isolate_pageblock; |
d702909f | 1485 | unsigned long flags; |
0c0e6195 | 1486 | struct zone *zone; |
7b78d335 | 1487 | struct memory_notify arg; |
79605093 | 1488 | char *reason; |
0c0e6195 | 1489 | |
381eab4a DH |
1490 | mem_hotplug_begin(); |
1491 | ||
c5e79ef5 DH |
1492 | /* |
1493 | * Don't allow to offline memory blocks that contain holes. | |
1494 | * Consequently, memory blocks with holes can never get onlined | |
1495 | * via the hotplug path - online_pages() - as hotplugged memory has | |
1496 | * no holes. This way, we e.g., don't have to worry about marking | |
1497 | * memory holes PG_reserved, don't need pfn_valid() checks, and can | |
1498 | * avoid using walk_system_ram_range() later. | |
1499 | */ | |
1500 | walk_system_ram_range(start_pfn, end_pfn - start_pfn, &nr_pages, | |
1501 | count_system_ram_pages_cb); | |
1502 | if (nr_pages != end_pfn - start_pfn) { | |
1503 | ret = -EINVAL; | |
1504 | reason = "memory holes"; | |
1505 | goto failed_removal; | |
1506 | } | |
1507 | ||
0c0e6195 KH |
1508 | /* This makes hotplug much easier...and readable. |
1509 | we assume this for now. .*/ | |
92917998 DH |
1510 | zone = test_pages_in_a_zone(start_pfn, end_pfn); |
1511 | if (!zone) { | |
79605093 MH |
1512 | ret = -EINVAL; |
1513 | reason = "multizone range"; | |
1514 | goto failed_removal; | |
381eab4a | 1515 | } |
7b78d335 | 1516 | node = zone_to_nid(zone); |
7b78d335 | 1517 | |
0c0e6195 | 1518 | /* set above range as isolated */ |
b023f468 | 1519 | ret = start_isolate_page_range(start_pfn, end_pfn, |
d381c547 | 1520 | MIGRATE_MOVABLE, |
756d25be | 1521 | MEMORY_OFFLINE | REPORT_FAILURE); |
9b7ea46a | 1522 | if (ret < 0) { |
79605093 MH |
1523 | reason = "failure to isolate range"; |
1524 | goto failed_removal; | |
381eab4a | 1525 | } |
9b7ea46a | 1526 | nr_isolate_pageblock = ret; |
7b78d335 YG |
1527 | |
1528 | arg.start_pfn = start_pfn; | |
1529 | arg.nr_pages = nr_pages; | |
d9713679 | 1530 | node_states_check_changes_offline(nr_pages, zone, &arg); |
7b78d335 YG |
1531 | |
1532 | ret = memory_notify(MEM_GOING_OFFLINE, &arg); | |
1533 | ret = notifier_to_errno(ret); | |
79605093 MH |
1534 | if (ret) { |
1535 | reason = "notifier failure"; | |
1536 | goto failed_removal_isolated; | |
1537 | } | |
7b78d335 | 1538 | |
bb8965bd | 1539 | do { |
aa218795 DH |
1540 | pfn = start_pfn; |
1541 | do { | |
bb8965bd MH |
1542 | if (signal_pending(current)) { |
1543 | ret = -EINTR; | |
1544 | reason = "signal backoff"; | |
1545 | goto failed_removal_isolated; | |
1546 | } | |
72b39cfc | 1547 | |
bb8965bd MH |
1548 | cond_resched(); |
1549 | lru_add_drain_all(); | |
bb8965bd | 1550 | |
aa218795 DH |
1551 | ret = scan_movable_pages(pfn, end_pfn, &pfn); |
1552 | if (!ret) { | |
bb8965bd MH |
1553 | /* |
1554 | * TODO: fatal migration failures should bail | |
1555 | * out | |
1556 | */ | |
1557 | do_migrate_range(pfn, end_pfn); | |
1558 | } | |
aa218795 DH |
1559 | } while (!ret); |
1560 | ||
1561 | if (ret != -ENOENT) { | |
1562 | reason = "unmovable page"; | |
1563 | goto failed_removal_isolated; | |
bb8965bd | 1564 | } |
0c0e6195 | 1565 | |
bb8965bd MH |
1566 | /* |
1567 | * Dissolve free hugepages in the memory block before doing | |
1568 | * offlining actually in order to make hugetlbfs's object | |
1569 | * counting consistent. | |
1570 | */ | |
1571 | ret = dissolve_free_huge_pages(start_pfn, end_pfn); | |
1572 | if (ret) { | |
1573 | reason = "failure to dissolve huge pages"; | |
1574 | goto failed_removal_isolated; | |
1575 | } | |
1576 | /* check again */ | |
5557c766 MH |
1577 | ret = walk_system_ram_range(start_pfn, end_pfn - start_pfn, |
1578 | NULL, check_pages_isolated_cb); | |
96831826 PT |
1579 | /* |
1580 | * per-cpu pages are drained in start_isolate_page_range, but if | |
1581 | * there are still pages that are not free, make sure that we | |
1582 | * drain again, because when we isolated range we might | |
1583 | * have raced with another thread that was adding pages to pcp | |
1584 | * list. | |
1585 | * | |
1586 | * Forward progress should be still guaranteed because | |
1587 | * pages on the pcp list can only belong to MOVABLE_ZONE | |
1588 | * because has_unmovable_pages explicitly checks for | |
1589 | * PageBuddy on freed pages on other zones. | |
1590 | */ | |
1591 | if (ret) | |
1592 | drain_all_pages(zone); | |
5557c766 | 1593 | } while (ret); |
72b39cfc | 1594 | |
b3834be5 | 1595 | /* Ok, all of our target is isolated. |
0c0e6195 | 1596 | We cannot do rollback at this point. */ |
5557c766 MH |
1597 | walk_system_ram_range(start_pfn, end_pfn - start_pfn, |
1598 | &offlined_pages, offline_isolated_pages_cb); | |
1599 | pr_info("Offlined Pages %ld\n", offlined_pages); | |
9b7ea46a QC |
1600 | /* |
1601 | * Onlining will reset pagetype flags and makes migrate type | |
1602 | * MOVABLE, so just need to decrease the number of isolated | |
1603 | * pageblocks zone counter here. | |
1604 | */ | |
1605 | spin_lock_irqsave(&zone->lock, flags); | |
1606 | zone->nr_isolate_pageblock -= nr_isolate_pageblock; | |
1607 | spin_unlock_irqrestore(&zone->lock, flags); | |
1608 | ||
0c0e6195 | 1609 | /* removal success */ |
3dcc0571 | 1610 | adjust_managed_page_count(pfn_to_page(start_pfn), -offlined_pages); |
0c0e6195 | 1611 | zone->present_pages -= offlined_pages; |
d702909f CS |
1612 | |
1613 | pgdat_resize_lock(zone->zone_pgdat, &flags); | |
0c0e6195 | 1614 | zone->zone_pgdat->node_present_pages -= offlined_pages; |
d702909f | 1615 | pgdat_resize_unlock(zone->zone_pgdat, &flags); |
7b78d335 | 1616 | |
1b79acc9 KM |
1617 | init_per_zone_wmark_min(); |
1618 | ||
1e8537ba | 1619 | if (!populated_zone(zone)) { |
340175b7 | 1620 | zone_pcp_reset(zone); |
72675e13 | 1621 | build_all_zonelists(NULL); |
1e8537ba XQ |
1622 | } else |
1623 | zone_pcp_update(zone); | |
340175b7 | 1624 | |
d9713679 | 1625 | node_states_clear_node(node, &arg); |
698b1b30 | 1626 | if (arg.status_change_nid >= 0) { |
8fe23e05 | 1627 | kswapd_stop(node); |
698b1b30 VB |
1628 | kcompactd_stop(node); |
1629 | } | |
bce7394a | 1630 | |
0c0e6195 | 1631 | writeback_set_ratelimit(); |
7b78d335 YG |
1632 | |
1633 | memory_notify(MEM_OFFLINE, &arg); | |
feee6b29 | 1634 | remove_pfn_range_from_zone(zone, start_pfn, nr_pages); |
381eab4a | 1635 | mem_hotplug_done(); |
0c0e6195 KH |
1636 | return 0; |
1637 | ||
79605093 MH |
1638 | failed_removal_isolated: |
1639 | undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE); | |
c4efe484 | 1640 | memory_notify(MEM_CANCEL_OFFLINE, &arg); |
0c0e6195 | 1641 | failed_removal: |
79605093 | 1642 | pr_debug("memory offlining [mem %#010llx-%#010llx] failed due to %s\n", |
e33e33b4 | 1643 | (unsigned long long) start_pfn << PAGE_SHIFT, |
79605093 MH |
1644 | ((unsigned long long) end_pfn << PAGE_SHIFT) - 1, |
1645 | reason); | |
0c0e6195 | 1646 | /* pushback to free area */ |
381eab4a | 1647 | mem_hotplug_done(); |
0c0e6195 KH |
1648 | return ret; |
1649 | } | |
71088785 | 1650 | |
a16cee10 WC |
1651 | int offline_pages(unsigned long start_pfn, unsigned long nr_pages) |
1652 | { | |
ecde0f3e | 1653 | return __offline_pages(start_pfn, start_pfn + nr_pages); |
a16cee10 WC |
1654 | } |
1655 | ||
d6de9d53 | 1656 | static int check_memblock_offlined_cb(struct memory_block *mem, void *arg) |
bbc76be6 WC |
1657 | { |
1658 | int ret = !is_memblock_offlined(mem); | |
1659 | ||
349daa0f RD |
1660 | if (unlikely(ret)) { |
1661 | phys_addr_t beginpa, endpa; | |
1662 | ||
1663 | beginpa = PFN_PHYS(section_nr_to_pfn(mem->start_section_nr)); | |
b6c88d3b | 1664 | endpa = beginpa + memory_block_size_bytes() - 1; |
756a025f | 1665 | pr_warn("removing memory fails, because memory [%pa-%pa] is onlined\n", |
349daa0f | 1666 | &beginpa, &endpa); |
bbc76be6 | 1667 | |
eca499ab PT |
1668 | return -EBUSY; |
1669 | } | |
1670 | return 0; | |
bbc76be6 WC |
1671 | } |
1672 | ||
0f1cfe9d | 1673 | static int check_cpu_on_node(pg_data_t *pgdat) |
60a5a19e | 1674 | { |
60a5a19e TC |
1675 | int cpu; |
1676 | ||
1677 | for_each_present_cpu(cpu) { | |
1678 | if (cpu_to_node(cpu) == pgdat->node_id) | |
1679 | /* | |
1680 | * the cpu on this node isn't removed, and we can't | |
1681 | * offline this node. | |
1682 | */ | |
1683 | return -EBUSY; | |
1684 | } | |
1685 | ||
1686 | return 0; | |
1687 | } | |
1688 | ||
2c91f8fc DH |
1689 | static int check_no_memblock_for_node_cb(struct memory_block *mem, void *arg) |
1690 | { | |
1691 | int nid = *(int *)arg; | |
1692 | ||
1693 | /* | |
1694 | * If a memory block belongs to multiple nodes, the stored nid is not | |
1695 | * reliable. However, such blocks are always online (e.g., cannot get | |
1696 | * offlined) and, therefore, are still spanned by the node. | |
1697 | */ | |
1698 | return mem->nid == nid ? -EEXIST : 0; | |
1699 | } | |
1700 | ||
0f1cfe9d TK |
1701 | /** |
1702 | * try_offline_node | |
e8b098fc | 1703 | * @nid: the node ID |
0f1cfe9d TK |
1704 | * |
1705 | * Offline a node if all memory sections and cpus of the node are removed. | |
1706 | * | |
1707 | * NOTE: The caller must call lock_device_hotplug() to serialize hotplug | |
1708 | * and online/offline operations before this call. | |
1709 | */ | |
90b30cdc | 1710 | void try_offline_node(int nid) |
60a5a19e | 1711 | { |
d822b86a | 1712 | pg_data_t *pgdat = NODE_DATA(nid); |
2c91f8fc | 1713 | int rc; |
60a5a19e | 1714 | |
2c91f8fc DH |
1715 | /* |
1716 | * If the node still spans pages (especially ZONE_DEVICE), don't | |
1717 | * offline it. A node spans memory after move_pfn_range_to_zone(), | |
1718 | * e.g., after the memory block was onlined. | |
1719 | */ | |
1720 | if (pgdat->node_spanned_pages) | |
1721 | return; | |
60a5a19e | 1722 | |
2c91f8fc DH |
1723 | /* |
1724 | * Especially offline memory blocks might not be spanned by the | |
1725 | * node. They will get spanned by the node once they get onlined. | |
1726 | * However, they link to the node in sysfs and can get onlined later. | |
1727 | */ | |
1728 | rc = for_each_memory_block(&nid, check_no_memblock_for_node_cb); | |
1729 | if (rc) | |
60a5a19e | 1730 | return; |
60a5a19e | 1731 | |
46a3679b | 1732 | if (check_cpu_on_node(pgdat)) |
60a5a19e TC |
1733 | return; |
1734 | ||
1735 | /* | |
1736 | * all memory/cpu of this node are removed, we can offline this | |
1737 | * node now. | |
1738 | */ | |
1739 | node_set_offline(nid); | |
1740 | unregister_one_node(nid); | |
1741 | } | |
90b30cdc | 1742 | EXPORT_SYMBOL(try_offline_node); |
60a5a19e | 1743 | |
d9eb1417 DH |
1744 | static void __release_memory_resource(resource_size_t start, |
1745 | resource_size_t size) | |
1746 | { | |
1747 | int ret; | |
1748 | ||
1749 | /* | |
1750 | * When removing memory in the same granularity as it was added, | |
1751 | * this function never fails. It might only fail if resources | |
1752 | * have to be adjusted or split. We'll ignore the error, as | |
1753 | * removing of memory cannot fail. | |
1754 | */ | |
1755 | ret = release_mem_region_adjustable(&iomem_resource, start, size); | |
1756 | if (ret) { | |
1757 | resource_size_t endres = start + size - 1; | |
1758 | ||
1759 | pr_warn("Unable to release resource <%pa-%pa> (%d)\n", | |
1760 | &start, &endres, ret); | |
1761 | } | |
1762 | } | |
1763 | ||
eca499ab | 1764 | static int __ref try_remove_memory(int nid, u64 start, u64 size) |
bbc76be6 | 1765 | { |
eca499ab | 1766 | int rc = 0; |
993c1aad | 1767 | |
27356f54 TK |
1768 | BUG_ON(check_hotplug_memory_range(start, size)); |
1769 | ||
6677e3ea | 1770 | /* |
242831eb | 1771 | * All memory blocks must be offlined before removing memory. Check |
eca499ab | 1772 | * whether all memory blocks in question are offline and return error |
242831eb | 1773 | * if this is not the case. |
6677e3ea | 1774 | */ |
fbcf73ce | 1775 | rc = walk_memory_blocks(start, size, NULL, check_memblock_offlined_cb); |
eca499ab | 1776 | if (rc) |
b4223a51 | 1777 | return rc; |
6677e3ea | 1778 | |
46c66c4b YI |
1779 | /* remove memmap entry */ |
1780 | firmware_map_remove(start, start + size, "System RAM"); | |
4c4b7f9b | 1781 | |
f1037ec0 DW |
1782 | /* |
1783 | * Memory block device removal under the device_hotplug_lock is | |
1784 | * a barrier against racing online attempts. | |
1785 | */ | |
4c4b7f9b | 1786 | remove_memory_block_devices(start, size); |
46c66c4b | 1787 | |
f1037ec0 DW |
1788 | mem_hotplug_begin(); |
1789 | ||
2c2a5af6 | 1790 | arch_remove_memory(nid, start, size, NULL); |
52219aea DH |
1791 | |
1792 | if (IS_ENABLED(CONFIG_ARCH_KEEP_MEMBLOCK)) { | |
1793 | memblock_free(start, size); | |
1794 | memblock_remove(start, size); | |
1795 | } | |
1796 | ||
d9eb1417 | 1797 | __release_memory_resource(start, size); |
24d335ca | 1798 | |
60a5a19e TC |
1799 | try_offline_node(nid); |
1800 | ||
bfc8c901 | 1801 | mem_hotplug_done(); |
b4223a51 | 1802 | return 0; |
71088785 | 1803 | } |
d15e5926 | 1804 | |
eca499ab PT |
1805 | /** |
1806 | * remove_memory | |
1807 | * @nid: the node ID | |
1808 | * @start: physical address of the region to remove | |
1809 | * @size: size of the region to remove | |
1810 | * | |
1811 | * NOTE: The caller must call lock_device_hotplug() to serialize hotplug | |
1812 | * and online/offline operations before this call, as required by | |
1813 | * try_offline_node(). | |
1814 | */ | |
1815 | void __remove_memory(int nid, u64 start, u64 size) | |
1816 | { | |
1817 | ||
1818 | /* | |
29a90db9 | 1819 | * trigger BUG() if some memory is not offlined prior to calling this |
eca499ab PT |
1820 | * function |
1821 | */ | |
1822 | if (try_remove_memory(nid, start, size)) | |
1823 | BUG(); | |
1824 | } | |
1825 | ||
1826 | /* | |
1827 | * Remove memory if every memory block is offline, otherwise return -EBUSY is | |
1828 | * some memory is not offline | |
1829 | */ | |
1830 | int remove_memory(int nid, u64 start, u64 size) | |
d15e5926 | 1831 | { |
eca499ab PT |
1832 | int rc; |
1833 | ||
d15e5926 | 1834 | lock_device_hotplug(); |
eca499ab | 1835 | rc = try_remove_memory(nid, start, size); |
d15e5926 | 1836 | unlock_device_hotplug(); |
eca499ab PT |
1837 | |
1838 | return rc; | |
d15e5926 | 1839 | } |
71088785 | 1840 | EXPORT_SYMBOL_GPL(remove_memory); |
08b3acd7 DH |
1841 | |
1842 | /* | |
1843 | * Try to offline and remove a memory block. Might take a long time to | |
1844 | * finish in case memory is still in use. Primarily useful for memory devices | |
1845 | * that logically unplugged all memory (so it's no longer in use) and want to | |
1846 | * offline + remove the memory block. | |
1847 | */ | |
1848 | int offline_and_remove_memory(int nid, u64 start, u64 size) | |
1849 | { | |
1850 | struct memory_block *mem; | |
1851 | int rc = -EINVAL; | |
1852 | ||
1853 | if (!IS_ALIGNED(start, memory_block_size_bytes()) || | |
1854 | size != memory_block_size_bytes()) | |
1855 | return rc; | |
1856 | ||
1857 | lock_device_hotplug(); | |
1858 | mem = find_memory_block(__pfn_to_section(PFN_DOWN(start))); | |
1859 | if (mem) | |
1860 | rc = device_offline(&mem->dev); | |
1861 | /* Ignore if the device is already offline. */ | |
1862 | if (rc > 0) | |
1863 | rc = 0; | |
1864 | ||
1865 | /* | |
1866 | * In case we succeeded to offline the memory block, remove it. | |
1867 | * This cannot fail as it cannot get onlined in the meantime. | |
1868 | */ | |
1869 | if (!rc) { | |
1870 | rc = try_remove_memory(nid, start, size); | |
1871 | WARN_ON_ONCE(rc); | |
1872 | } | |
1873 | unlock_device_hotplug(); | |
1874 | ||
1875 | return rc; | |
1876 | } | |
1877 | EXPORT_SYMBOL_GPL(offline_and_remove_memory); | |
aba6efc4 | 1878 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |