Commit | Line | Data |
---|---|---|
3947be19 DH |
1 | /* |
2 | * linux/mm/memory_hotplug.c | |
3 | * | |
4 | * Copyright (C) | |
5 | */ | |
6 | ||
3947be19 DH |
7 | #include <linux/stddef.h> |
8 | #include <linux/mm.h> | |
174cd4b1 | 9 | #include <linux/sched/signal.h> |
3947be19 DH |
10 | #include <linux/swap.h> |
11 | #include <linux/interrupt.h> | |
12 | #include <linux/pagemap.h> | |
3947be19 | 13 | #include <linux/compiler.h> |
b95f1b31 | 14 | #include <linux/export.h> |
3947be19 | 15 | #include <linux/pagevec.h> |
2d1d43f6 | 16 | #include <linux/writeback.h> |
3947be19 DH |
17 | #include <linux/slab.h> |
18 | #include <linux/sysctl.h> | |
19 | #include <linux/cpu.h> | |
20 | #include <linux/memory.h> | |
4b94ffdc | 21 | #include <linux/memremap.h> |
3947be19 DH |
22 | #include <linux/memory_hotplug.h> |
23 | #include <linux/highmem.h> | |
24 | #include <linux/vmalloc.h> | |
0a547039 | 25 | #include <linux/ioport.h> |
0c0e6195 KH |
26 | #include <linux/delay.h> |
27 | #include <linux/migrate.h> | |
28 | #include <linux/page-isolation.h> | |
71088785 | 29 | #include <linux/pfn.h> |
6ad696d2 | 30 | #include <linux/suspend.h> |
6d9c285a | 31 | #include <linux/mm_inline.h> |
d96ae530 | 32 | #include <linux/firmware-map.h> |
60a5a19e | 33 | #include <linux/stop_machine.h> |
c8721bbb | 34 | #include <linux/hugetlb.h> |
c5320926 | 35 | #include <linux/memblock.h> |
698b1b30 | 36 | #include <linux/compaction.h> |
b15c8726 | 37 | #include <linux/rmap.h> |
3947be19 DH |
38 | |
39 | #include <asm/tlbflush.h> | |
40 | ||
1e5ad9a3 AB |
41 | #include "internal.h" |
42 | ||
9d0ad8ca DK |
43 | /* |
44 | * online_page_callback contains pointer to current page onlining function. | |
45 | * Initially it is generic_online_page(). If it is required it could be | |
46 | * changed by calling set_online_page_callback() for callback registration | |
47 | * and restore_online_page_callback() for generic callback restore. | |
48 | */ | |
49 | ||
a9cd410a | 50 | static void generic_online_page(struct page *page, unsigned int order); |
9d0ad8ca DK |
51 | |
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 |
31bc3858 | 70 | bool memhp_auto_online; |
8604d9e5 VK |
71 | #else |
72 | bool memhp_auto_online = true; | |
73 | #endif | |
31bc3858 VK |
74 | EXPORT_SYMBOL_GPL(memhp_auto_online); |
75 | ||
86dd995d VK |
76 | static int __init setup_memhp_default_state(char *str) |
77 | { | |
78 | if (!strcmp(str, "online")) | |
79 | memhp_auto_online = true; | |
80 | else if (!strcmp(str, "offline")) | |
81 | memhp_auto_online = false; | |
82 | ||
83 | return 1; | |
84 | } | |
85 | __setup("memhp_default_state=", setup_memhp_default_state); | |
86 | ||
30467e0b | 87 | void mem_hotplug_begin(void) |
20d6c96b | 88 | { |
3f906ba2 TG |
89 | cpus_read_lock(); |
90 | percpu_down_write(&mem_hotplug_lock); | |
20d6c96b KM |
91 | } |
92 | ||
30467e0b | 93 | void mem_hotplug_done(void) |
bfc8c901 | 94 | { |
3f906ba2 TG |
95 | percpu_up_write(&mem_hotplug_lock); |
96 | cpus_read_unlock(); | |
bfc8c901 | 97 | } |
20d6c96b | 98 | |
357b4da5 JG |
99 | u64 max_mem_size = U64_MAX; |
100 | ||
45e0b78b KM |
101 | /* add this memory to iomem resource */ |
102 | static struct resource *register_memory_resource(u64 start, u64 size) | |
103 | { | |
2794129e DH |
104 | struct resource *res; |
105 | unsigned long flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; | |
106 | char *resource_name = "System RAM"; | |
357b4da5 JG |
107 | |
108 | if (start + size > max_mem_size) | |
109 | return ERR_PTR(-E2BIG); | |
110 | ||
2794129e DH |
111 | /* |
112 | * Request ownership of the new memory range. This might be | |
113 | * a child of an existing resource that was present but | |
114 | * not marked as busy. | |
115 | */ | |
116 | res = __request_region(&iomem_resource, start, size, | |
117 | resource_name, flags); | |
118 | ||
119 | if (!res) { | |
120 | pr_debug("Unable to reserve System RAM region: %016llx->%016llx\n", | |
121 | start, start + size); | |
6f754ba4 | 122 | return ERR_PTR(-EEXIST); |
45e0b78b KM |
123 | } |
124 | return res; | |
125 | } | |
126 | ||
127 | static void release_memory_resource(struct resource *res) | |
128 | { | |
129 | if (!res) | |
130 | return; | |
131 | release_resource(res); | |
132 | kfree(res); | |
133 | return; | |
134 | } | |
135 | ||
53947027 | 136 | #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE |
46723bfa YI |
137 | void get_page_bootmem(unsigned long info, struct page *page, |
138 | unsigned long type) | |
04753278 | 139 | { |
ddffe98d | 140 | page->freelist = (void *)type; |
04753278 YG |
141 | SetPagePrivate(page); |
142 | set_page_private(page, info); | |
fe896d18 | 143 | page_ref_inc(page); |
04753278 YG |
144 | } |
145 | ||
170a5a7e | 146 | void put_page_bootmem(struct page *page) |
04753278 | 147 | { |
5f24ce5f | 148 | unsigned long type; |
04753278 | 149 | |
ddffe98d | 150 | type = (unsigned long) page->freelist; |
5f24ce5f AA |
151 | BUG_ON(type < MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE || |
152 | type > MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE); | |
04753278 | 153 | |
fe896d18 | 154 | if (page_ref_dec_return(page) == 1) { |
ddffe98d | 155 | page->freelist = NULL; |
04753278 YG |
156 | ClearPagePrivate(page); |
157 | set_page_private(page, 0); | |
5f24ce5f | 158 | INIT_LIST_HEAD(&page->lru); |
170a5a7e | 159 | free_reserved_page(page); |
04753278 | 160 | } |
04753278 YG |
161 | } |
162 | ||
46723bfa YI |
163 | #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE |
164 | #ifndef CONFIG_SPARSEMEM_VMEMMAP | |
d92bc318 | 165 | static void register_page_bootmem_info_section(unsigned long start_pfn) |
04753278 YG |
166 | { |
167 | unsigned long *usemap, mapsize, section_nr, i; | |
168 | struct mem_section *ms; | |
169 | struct page *page, *memmap; | |
170 | ||
04753278 YG |
171 | section_nr = pfn_to_section_nr(start_pfn); |
172 | ms = __nr_to_section(section_nr); | |
173 | ||
174 | /* Get section's memmap address */ | |
175 | memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); | |
176 | ||
177 | /* | |
178 | * Get page for the memmap's phys address | |
179 | * XXX: need more consideration for sparse_vmemmap... | |
180 | */ | |
181 | page = virt_to_page(memmap); | |
182 | mapsize = sizeof(struct page) * PAGES_PER_SECTION; | |
183 | mapsize = PAGE_ALIGN(mapsize) >> PAGE_SHIFT; | |
184 | ||
185 | /* remember memmap's page */ | |
186 | for (i = 0; i < mapsize; i++, page++) | |
187 | get_page_bootmem(section_nr, page, SECTION_INFO); | |
188 | ||
9ac9322d | 189 | usemap = ms->pageblock_flags; |
04753278 YG |
190 | page = virt_to_page(usemap); |
191 | ||
192 | mapsize = PAGE_ALIGN(usemap_size()) >> PAGE_SHIFT; | |
193 | ||
194 | for (i = 0; i < mapsize; i++, page++) | |
af370fb8 | 195 | get_page_bootmem(section_nr, page, MIX_SECTION_INFO); |
04753278 YG |
196 | |
197 | } | |
46723bfa YI |
198 | #else /* CONFIG_SPARSEMEM_VMEMMAP */ |
199 | static void register_page_bootmem_info_section(unsigned long start_pfn) | |
200 | { | |
201 | unsigned long *usemap, mapsize, section_nr, i; | |
202 | struct mem_section *ms; | |
203 | struct page *page, *memmap; | |
204 | ||
46723bfa YI |
205 | section_nr = pfn_to_section_nr(start_pfn); |
206 | ms = __nr_to_section(section_nr); | |
207 | ||
208 | memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); | |
209 | ||
210 | register_page_bootmem_memmap(section_nr, memmap, PAGES_PER_SECTION); | |
211 | ||
9ac9322d | 212 | usemap = ms->pageblock_flags; |
46723bfa YI |
213 | page = virt_to_page(usemap); |
214 | ||
215 | mapsize = PAGE_ALIGN(usemap_size()) >> PAGE_SHIFT; | |
216 | ||
217 | for (i = 0; i < mapsize; i++, page++) | |
218 | get_page_bootmem(section_nr, page, MIX_SECTION_INFO); | |
219 | } | |
220 | #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ | |
04753278 | 221 | |
7ded384a | 222 | void __init register_page_bootmem_info_node(struct pglist_data *pgdat) |
04753278 YG |
223 | { |
224 | unsigned long i, pfn, end_pfn, nr_pages; | |
225 | int node = pgdat->node_id; | |
226 | struct page *page; | |
04753278 YG |
227 | |
228 | nr_pages = PAGE_ALIGN(sizeof(struct pglist_data)) >> PAGE_SHIFT; | |
229 | page = virt_to_page(pgdat); | |
230 | ||
231 | for (i = 0; i < nr_pages; i++, page++) | |
232 | get_page_bootmem(node, page, NODE_INFO); | |
233 | ||
04753278 | 234 | pfn = pgdat->node_start_pfn; |
c1f19495 | 235 | end_pfn = pgdat_end_pfn(pgdat); |
04753278 | 236 | |
7e9f5eb0 | 237 | /* register section info */ |
f14851af | 238 | for (; pfn < end_pfn; pfn += PAGES_PER_SECTION) { |
239 | /* | |
240 | * Some platforms can assign the same pfn to multiple nodes - on | |
241 | * node0 as well as nodeN. To avoid registering a pfn against | |
242 | * multiple nodes we check that this pfn does not already | |
7e9f5eb0 | 243 | * reside in some other nodes. |
f14851af | 244 | */ |
f65e91df | 245 | if (pfn_valid(pfn) && (early_pfn_to_nid(pfn) == node)) |
f14851af | 246 | register_page_bootmem_info_section(pfn); |
247 | } | |
04753278 | 248 | } |
46723bfa | 249 | #endif /* CONFIG_HAVE_BOOTMEM_INFO_NODE */ |
04753278 | 250 | |
f1dd2cd1 | 251 | static int __meminit __add_section(int nid, unsigned long phys_start_pfn, |
7b73d978 | 252 | struct vmem_altmap *altmap, bool want_memblock) |
3947be19 | 253 | { |
3947be19 DH |
254 | int ret; |
255 | ||
ebd15302 KH |
256 | if (pfn_valid(phys_start_pfn)) |
257 | return -EEXIST; | |
258 | ||
4e0d2e7e | 259 | ret = sparse_add_one_section(nid, phys_start_pfn, altmap); |
3947be19 DH |
260 | if (ret < 0) |
261 | return ret; | |
262 | ||
1b862aec MH |
263 | if (!want_memblock) |
264 | return 0; | |
265 | ||
fc44f7f9 | 266 | return hotplug_memory_register(nid, __pfn_to_section(phys_start_pfn)); |
3947be19 DH |
267 | } |
268 | ||
4edd7cef DR |
269 | /* |
270 | * Reasonably generic function for adding memory. It is | |
271 | * expected that archs that support memory hotplug will | |
272 | * call this function after deciding the zone to which to | |
273 | * add the new pages. | |
274 | */ | |
f1dd2cd1 | 275 | int __ref __add_pages(int nid, unsigned long phys_start_pfn, |
24e6d5a5 CH |
276 | unsigned long nr_pages, struct vmem_altmap *altmap, |
277 | bool want_memblock) | |
4edd7cef DR |
278 | { |
279 | unsigned long i; | |
280 | int err = 0; | |
281 | int start_sec, end_sec; | |
4b94ffdc | 282 | |
4edd7cef DR |
283 | /* during initialize mem_map, align hot-added range to section */ |
284 | start_sec = pfn_to_section_nr(phys_start_pfn); | |
285 | end_sec = pfn_to_section_nr(phys_start_pfn + nr_pages - 1); | |
286 | ||
4b94ffdc DW |
287 | if (altmap) { |
288 | /* | |
289 | * Validate altmap is within bounds of the total request | |
290 | */ | |
291 | if (altmap->base_pfn != phys_start_pfn | |
292 | || vmem_altmap_offset(altmap) > nr_pages) { | |
293 | pr_warn_once("memory add fail, invalid altmap\n"); | |
7cf91a98 JK |
294 | err = -EINVAL; |
295 | goto out; | |
4b94ffdc DW |
296 | } |
297 | altmap->alloc = 0; | |
298 | } | |
299 | ||
4edd7cef | 300 | for (i = start_sec; i <= end_sec; i++) { |
7b73d978 CH |
301 | err = __add_section(nid, section_nr_to_pfn(i), altmap, |
302 | want_memblock); | |
4edd7cef DR |
303 | |
304 | /* | |
305 | * EEXIST is finally dealt with by ioresource collision | |
306 | * check. see add_memory() => register_memory_resource() | |
307 | * Warning will be printed if there is collision. | |
308 | */ | |
309 | if (err && (err != -EEXIST)) | |
310 | break; | |
311 | err = 0; | |
f64ac5e6 | 312 | cond_resched(); |
4edd7cef | 313 | } |
c435a390 | 314 | vmemmap_populate_print_last(); |
7cf91a98 | 315 | out: |
4edd7cef DR |
316 | return err; |
317 | } | |
4edd7cef DR |
318 | |
319 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
815121d2 | 320 | /* find the smallest valid pfn in the range [start_pfn, end_pfn) */ |
d09b0137 | 321 | static unsigned long find_smallest_section_pfn(int nid, struct zone *zone, |
815121d2 YI |
322 | unsigned long start_pfn, |
323 | unsigned long end_pfn) | |
324 | { | |
325 | struct mem_section *ms; | |
326 | ||
327 | for (; start_pfn < end_pfn; start_pfn += PAGES_PER_SECTION) { | |
328 | ms = __pfn_to_section(start_pfn); | |
329 | ||
330 | if (unlikely(!valid_section(ms))) | |
331 | continue; | |
332 | ||
333 | if (unlikely(pfn_to_nid(start_pfn) != nid)) | |
334 | continue; | |
335 | ||
336 | if (zone && zone != page_zone(pfn_to_page(start_pfn))) | |
337 | continue; | |
338 | ||
339 | return start_pfn; | |
340 | } | |
341 | ||
342 | return 0; | |
343 | } | |
344 | ||
345 | /* find the biggest valid pfn in the range [start_pfn, end_pfn). */ | |
d09b0137 | 346 | static unsigned long find_biggest_section_pfn(int nid, struct zone *zone, |
815121d2 YI |
347 | unsigned long start_pfn, |
348 | unsigned long end_pfn) | |
349 | { | |
350 | struct mem_section *ms; | |
351 | unsigned long pfn; | |
352 | ||
353 | /* pfn is the end pfn of a memory section. */ | |
354 | pfn = end_pfn - 1; | |
355 | for (; pfn >= start_pfn; pfn -= PAGES_PER_SECTION) { | |
356 | ms = __pfn_to_section(pfn); | |
357 | ||
358 | if (unlikely(!valid_section(ms))) | |
359 | continue; | |
360 | ||
361 | if (unlikely(pfn_to_nid(pfn) != nid)) | |
362 | continue; | |
363 | ||
364 | if (zone && zone != page_zone(pfn_to_page(pfn))) | |
365 | continue; | |
366 | ||
367 | return pfn; | |
368 | } | |
369 | ||
370 | return 0; | |
371 | } | |
372 | ||
373 | static void shrink_zone_span(struct zone *zone, unsigned long start_pfn, | |
374 | unsigned long end_pfn) | |
375 | { | |
c33bc315 XQ |
376 | unsigned long zone_start_pfn = zone->zone_start_pfn; |
377 | unsigned long z = zone_end_pfn(zone); /* zone_end_pfn namespace clash */ | |
378 | unsigned long zone_end_pfn = z; | |
815121d2 YI |
379 | unsigned long pfn; |
380 | struct mem_section *ms; | |
381 | int nid = zone_to_nid(zone); | |
382 | ||
383 | zone_span_writelock(zone); | |
384 | if (zone_start_pfn == start_pfn) { | |
385 | /* | |
386 | * If the section is smallest section in the zone, it need | |
387 | * shrink zone->zone_start_pfn and zone->zone_spanned_pages. | |
388 | * In this case, we find second smallest valid mem_section | |
389 | * for shrinking zone. | |
390 | */ | |
391 | pfn = find_smallest_section_pfn(nid, zone, end_pfn, | |
392 | zone_end_pfn); | |
393 | if (pfn) { | |
394 | zone->zone_start_pfn = pfn; | |
395 | zone->spanned_pages = zone_end_pfn - pfn; | |
396 | } | |
397 | } else if (zone_end_pfn == end_pfn) { | |
398 | /* | |
399 | * If the section is biggest section in the zone, it need | |
400 | * shrink zone->spanned_pages. | |
401 | * In this case, we find second biggest valid mem_section for | |
402 | * shrinking zone. | |
403 | */ | |
404 | pfn = find_biggest_section_pfn(nid, zone, zone_start_pfn, | |
405 | start_pfn); | |
406 | if (pfn) | |
407 | zone->spanned_pages = pfn - zone_start_pfn + 1; | |
408 | } | |
409 | ||
410 | /* | |
411 | * The section is not biggest or smallest mem_section in the zone, it | |
412 | * only creates a hole in the zone. So in this case, we need not | |
413 | * change the zone. But perhaps, the zone has only hole data. Thus | |
414 | * it check the zone has only hole or not. | |
415 | */ | |
416 | pfn = zone_start_pfn; | |
417 | for (; pfn < zone_end_pfn; pfn += PAGES_PER_SECTION) { | |
418 | ms = __pfn_to_section(pfn); | |
419 | ||
420 | if (unlikely(!valid_section(ms))) | |
421 | continue; | |
422 | ||
423 | if (page_zone(pfn_to_page(pfn)) != zone) | |
424 | continue; | |
425 | ||
426 | /* If the section is current section, it continues the loop */ | |
427 | if (start_pfn == pfn) | |
428 | continue; | |
429 | ||
430 | /* If we find valid section, we have nothing to do */ | |
431 | zone_span_writeunlock(zone); | |
432 | return; | |
433 | } | |
434 | ||
435 | /* The zone has no valid section */ | |
436 | zone->zone_start_pfn = 0; | |
437 | zone->spanned_pages = 0; | |
438 | zone_span_writeunlock(zone); | |
439 | } | |
440 | ||
441 | static void shrink_pgdat_span(struct pglist_data *pgdat, | |
442 | unsigned long start_pfn, unsigned long end_pfn) | |
443 | { | |
83285c72 XQ |
444 | unsigned long pgdat_start_pfn = pgdat->node_start_pfn; |
445 | unsigned long p = pgdat_end_pfn(pgdat); /* pgdat_end_pfn namespace clash */ | |
446 | unsigned long pgdat_end_pfn = p; | |
815121d2 YI |
447 | unsigned long pfn; |
448 | struct mem_section *ms; | |
449 | int nid = pgdat->node_id; | |
450 | ||
451 | if (pgdat_start_pfn == start_pfn) { | |
452 | /* | |
453 | * If the section is smallest section in the pgdat, it need | |
454 | * shrink pgdat->node_start_pfn and pgdat->node_spanned_pages. | |
455 | * In this case, we find second smallest valid mem_section | |
456 | * for shrinking zone. | |
457 | */ | |
458 | pfn = find_smallest_section_pfn(nid, NULL, end_pfn, | |
459 | pgdat_end_pfn); | |
460 | if (pfn) { | |
461 | pgdat->node_start_pfn = pfn; | |
462 | pgdat->node_spanned_pages = pgdat_end_pfn - pfn; | |
463 | } | |
464 | } else if (pgdat_end_pfn == end_pfn) { | |
465 | /* | |
466 | * If the section is biggest section in the pgdat, it need | |
467 | * shrink pgdat->node_spanned_pages. | |
468 | * In this case, we find second biggest valid mem_section for | |
469 | * shrinking zone. | |
470 | */ | |
471 | pfn = find_biggest_section_pfn(nid, NULL, pgdat_start_pfn, | |
472 | start_pfn); | |
473 | if (pfn) | |
474 | pgdat->node_spanned_pages = pfn - pgdat_start_pfn + 1; | |
475 | } | |
476 | ||
477 | /* | |
478 | * If the section is not biggest or smallest mem_section in the pgdat, | |
479 | * it only creates a hole in the pgdat. So in this case, we need not | |
480 | * change the pgdat. | |
481 | * But perhaps, the pgdat has only hole data. Thus it check the pgdat | |
482 | * has only hole or not. | |
483 | */ | |
484 | pfn = pgdat_start_pfn; | |
485 | for (; pfn < pgdat_end_pfn; pfn += PAGES_PER_SECTION) { | |
486 | ms = __pfn_to_section(pfn); | |
487 | ||
488 | if (unlikely(!valid_section(ms))) | |
489 | continue; | |
490 | ||
491 | if (pfn_to_nid(pfn) != nid) | |
492 | continue; | |
493 | ||
494 | /* If the section is current section, it continues the loop */ | |
495 | if (start_pfn == pfn) | |
496 | continue; | |
497 | ||
498 | /* If we find valid section, we have nothing to do */ | |
499 | return; | |
500 | } | |
501 | ||
502 | /* The pgdat has no valid section */ | |
503 | pgdat->node_start_pfn = 0; | |
504 | pgdat->node_spanned_pages = 0; | |
505 | } | |
506 | ||
507 | static void __remove_zone(struct zone *zone, unsigned long start_pfn) | |
508 | { | |
509 | struct pglist_data *pgdat = zone->zone_pgdat; | |
510 | int nr_pages = PAGES_PER_SECTION; | |
815121d2 YI |
511 | unsigned long flags; |
512 | ||
815121d2 YI |
513 | pgdat_resize_lock(zone->zone_pgdat, &flags); |
514 | shrink_zone_span(zone, start_pfn, start_pfn + nr_pages); | |
515 | shrink_pgdat_span(pgdat, start_pfn, start_pfn + nr_pages); | |
516 | pgdat_resize_unlock(zone->zone_pgdat, &flags); | |
517 | } | |
518 | ||
4b94ffdc | 519 | static int __remove_section(struct zone *zone, struct mem_section *ms, |
24b6d416 | 520 | unsigned long map_offset, struct vmem_altmap *altmap) |
ea01ea93 | 521 | { |
815121d2 YI |
522 | unsigned long start_pfn; |
523 | int scn_nr; | |
ea01ea93 BP |
524 | int ret = -EINVAL; |
525 | ||
526 | if (!valid_section(ms)) | |
527 | return ret; | |
528 | ||
529 | ret = unregister_memory_section(ms); | |
530 | if (ret) | |
531 | return ret; | |
532 | ||
815121d2 | 533 | scn_nr = __section_nr(ms); |
1dd2bfc8 | 534 | start_pfn = section_nr_to_pfn((unsigned long)scn_nr); |
815121d2 YI |
535 | __remove_zone(zone, start_pfn); |
536 | ||
24b6d416 | 537 | sparse_remove_one_section(zone, ms, map_offset, altmap); |
ea01ea93 BP |
538 | return 0; |
539 | } | |
540 | ||
ea01ea93 BP |
541 | /** |
542 | * __remove_pages() - remove sections of pages from a zone | |
543 | * @zone: zone from which pages need to be removed | |
544 | * @phys_start_pfn: starting pageframe (must be aligned to start of a section) | |
545 | * @nr_pages: number of pages to remove (must be multiple of section size) | |
e8b098fc | 546 | * @altmap: alternative device page map or %NULL if default memmap is used |
ea01ea93 BP |
547 | * |
548 | * Generic helper function to remove section mappings and sysfs entries | |
549 | * for the section of the memory we are removing. Caller needs to make | |
550 | * sure that pages are marked reserved and zones are adjust properly by | |
551 | * calling offline_pages(). | |
552 | */ | |
553 | int __remove_pages(struct zone *zone, unsigned long phys_start_pfn, | |
da024512 | 554 | unsigned long nr_pages, struct vmem_altmap *altmap) |
ea01ea93 | 555 | { |
fe74ebb1 | 556 | unsigned long i; |
4b94ffdc DW |
557 | unsigned long map_offset = 0; |
558 | int sections_to_remove, ret = 0; | |
559 | ||
560 | /* In the ZONE_DEVICE case device driver owns the memory region */ | |
561 | if (is_dev_zone(zone)) { | |
4b94ffdc DW |
562 | if (altmap) |
563 | map_offset = vmem_altmap_offset(altmap); | |
564 | } else { | |
565 | resource_size_t start, size; | |
566 | ||
567 | start = phys_start_pfn << PAGE_SHIFT; | |
568 | size = nr_pages * PAGE_SIZE; | |
569 | ||
570 | ret = release_mem_region_adjustable(&iomem_resource, start, | |
571 | size); | |
572 | if (ret) { | |
573 | resource_size_t endres = start + size - 1; | |
574 | ||
575 | pr_warn("Unable to release resource <%pa-%pa> (%d)\n", | |
576 | &start, &endres, ret); | |
577 | } | |
578 | } | |
ea01ea93 | 579 | |
7cf91a98 JK |
580 | clear_zone_contiguous(zone); |
581 | ||
ea01ea93 BP |
582 | /* |
583 | * We can only remove entire sections | |
584 | */ | |
585 | BUG_ON(phys_start_pfn & ~PAGE_SECTION_MASK); | |
586 | BUG_ON(nr_pages % PAGES_PER_SECTION); | |
587 | ||
ea01ea93 BP |
588 | sections_to_remove = nr_pages / PAGES_PER_SECTION; |
589 | for (i = 0; i < sections_to_remove; i++) { | |
590 | unsigned long pfn = phys_start_pfn + i*PAGES_PER_SECTION; | |
4b94ffdc | 591 | |
dd33ad7b | 592 | cond_resched(); |
24b6d416 CH |
593 | ret = __remove_section(zone, __pfn_to_section(pfn), map_offset, |
594 | altmap); | |
4b94ffdc | 595 | map_offset = 0; |
ea01ea93 BP |
596 | if (ret) |
597 | break; | |
598 | } | |
7cf91a98 JK |
599 | |
600 | set_zone_contiguous(zone); | |
601 | ||
ea01ea93 BP |
602 | return ret; |
603 | } | |
4edd7cef | 604 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
ea01ea93 | 605 | |
9d0ad8ca DK |
606 | int set_online_page_callback(online_page_callback_t callback) |
607 | { | |
608 | int rc = -EINVAL; | |
609 | ||
bfc8c901 VD |
610 | get_online_mems(); |
611 | mutex_lock(&online_page_callback_lock); | |
9d0ad8ca DK |
612 | |
613 | if (online_page_callback == generic_online_page) { | |
614 | online_page_callback = callback; | |
615 | rc = 0; | |
616 | } | |
617 | ||
bfc8c901 VD |
618 | mutex_unlock(&online_page_callback_lock); |
619 | put_online_mems(); | |
9d0ad8ca DK |
620 | |
621 | return rc; | |
622 | } | |
623 | EXPORT_SYMBOL_GPL(set_online_page_callback); | |
624 | ||
625 | int restore_online_page_callback(online_page_callback_t callback) | |
626 | { | |
627 | int rc = -EINVAL; | |
628 | ||
bfc8c901 VD |
629 | get_online_mems(); |
630 | mutex_lock(&online_page_callback_lock); | |
9d0ad8ca DK |
631 | |
632 | if (online_page_callback == callback) { | |
633 | online_page_callback = generic_online_page; | |
634 | rc = 0; | |
635 | } | |
636 | ||
bfc8c901 VD |
637 | mutex_unlock(&online_page_callback_lock); |
638 | put_online_mems(); | |
9d0ad8ca DK |
639 | |
640 | return rc; | |
641 | } | |
642 | EXPORT_SYMBOL_GPL(restore_online_page_callback); | |
643 | ||
644 | void __online_page_set_limits(struct page *page) | |
180c06ef | 645 | { |
9d0ad8ca DK |
646 | } |
647 | EXPORT_SYMBOL_GPL(__online_page_set_limits); | |
648 | ||
649 | void __online_page_increment_counters(struct page *page) | |
650 | { | |
3dcc0571 | 651 | adjust_managed_page_count(page, 1); |
9d0ad8ca DK |
652 | } |
653 | EXPORT_SYMBOL_GPL(__online_page_increment_counters); | |
180c06ef | 654 | |
9d0ad8ca DK |
655 | void __online_page_free(struct page *page) |
656 | { | |
3dcc0571 | 657 | __free_reserved_page(page); |
180c06ef | 658 | } |
9d0ad8ca DK |
659 | EXPORT_SYMBOL_GPL(__online_page_free); |
660 | ||
a9cd410a | 661 | static void generic_online_page(struct page *page, unsigned int order) |
9d0ad8ca | 662 | { |
cd02cf1a | 663 | kernel_map_pages(page, 1 << order, 1); |
a9cd410a AK |
664 | __free_pages_core(page, order); |
665 | totalram_pages_add(1UL << order); | |
666 | #ifdef CONFIG_HIGHMEM | |
667 | if (PageHighMem(page)) | |
668 | totalhigh_pages_add(1UL << order); | |
669 | #endif | |
670 | } | |
671 | ||
672 | static int online_pages_blocks(unsigned long start, unsigned long nr_pages) | |
673 | { | |
674 | unsigned long end = start + nr_pages; | |
675 | int order, onlined_pages = 0; | |
676 | ||
677 | while (start < end) { | |
678 | order = min(MAX_ORDER - 1, | |
679 | get_order(PFN_PHYS(end) - PFN_PHYS(start))); | |
680 | (*online_page_callback)(pfn_to_page(start), order); | |
681 | ||
682 | onlined_pages += (1UL << order); | |
683 | start += (1UL << order); | |
684 | } | |
685 | return onlined_pages; | |
9d0ad8ca | 686 | } |
180c06ef | 687 | |
75884fb1 KH |
688 | static int online_pages_range(unsigned long start_pfn, unsigned long nr_pages, |
689 | void *arg) | |
3947be19 | 690 | { |
75884fb1 | 691 | unsigned long onlined_pages = *(unsigned long *)arg; |
2d070eab | 692 | |
75884fb1 | 693 | if (PageReserved(pfn_to_page(start_pfn))) |
a9cd410a | 694 | onlined_pages += online_pages_blocks(start_pfn, nr_pages); |
2d070eab MH |
695 | |
696 | online_mem_sections(start_pfn, start_pfn + nr_pages); | |
697 | ||
75884fb1 KH |
698 | *(unsigned long *)arg = onlined_pages; |
699 | return 0; | |
700 | } | |
701 | ||
d9713679 LJ |
702 | /* check which state of node_states will be changed when online memory */ |
703 | static void node_states_check_changes_online(unsigned long nr_pages, | |
704 | struct zone *zone, struct memory_notify *arg) | |
705 | { | |
706 | int nid = zone_to_nid(zone); | |
d9713679 | 707 | |
98fa15f3 AK |
708 | arg->status_change_nid = NUMA_NO_NODE; |
709 | arg->status_change_nid_normal = NUMA_NO_NODE; | |
710 | arg->status_change_nid_high = NUMA_NO_NODE; | |
d9713679 | 711 | |
8efe33f4 OS |
712 | if (!node_state(nid, N_MEMORY)) |
713 | arg->status_change_nid = nid; | |
714 | if (zone_idx(zone) <= ZONE_NORMAL && !node_state(nid, N_NORMAL_MEMORY)) | |
d9713679 | 715 | arg->status_change_nid_normal = nid; |
6715ddf9 | 716 | #ifdef CONFIG_HIGHMEM |
8efe33f4 | 717 | if (zone_idx(zone) <= N_HIGH_MEMORY && !node_state(nid, N_HIGH_MEMORY)) |
6715ddf9 | 718 | arg->status_change_nid_high = nid; |
6715ddf9 | 719 | #endif |
d9713679 LJ |
720 | } |
721 | ||
722 | static void node_states_set_node(int node, struct memory_notify *arg) | |
723 | { | |
724 | if (arg->status_change_nid_normal >= 0) | |
725 | node_set_state(node, N_NORMAL_MEMORY); | |
726 | ||
6715ddf9 LJ |
727 | if (arg->status_change_nid_high >= 0) |
728 | node_set_state(node, N_HIGH_MEMORY); | |
729 | ||
83d83612 OS |
730 | if (arg->status_change_nid >= 0) |
731 | node_set_state(node, N_MEMORY); | |
d9713679 LJ |
732 | } |
733 | ||
f1dd2cd1 MH |
734 | static void __meminit resize_zone_range(struct zone *zone, unsigned long start_pfn, |
735 | unsigned long nr_pages) | |
736 | { | |
737 | unsigned long old_end_pfn = zone_end_pfn(zone); | |
738 | ||
739 | if (zone_is_empty(zone) || start_pfn < zone->zone_start_pfn) | |
740 | zone->zone_start_pfn = start_pfn; | |
741 | ||
742 | zone->spanned_pages = max(start_pfn + nr_pages, old_end_pfn) - zone->zone_start_pfn; | |
743 | } | |
744 | ||
745 | static void __meminit resize_pgdat_range(struct pglist_data *pgdat, unsigned long start_pfn, | |
746 | unsigned long nr_pages) | |
747 | { | |
748 | unsigned long old_end_pfn = pgdat_end_pfn(pgdat); | |
749 | ||
750 | if (!pgdat->node_spanned_pages || start_pfn < pgdat->node_start_pfn) | |
751 | pgdat->node_start_pfn = start_pfn; | |
752 | ||
753 | pgdat->node_spanned_pages = max(start_pfn + nr_pages, old_end_pfn) - pgdat->node_start_pfn; | |
754 | } | |
755 | ||
a99583e7 CH |
756 | void __ref move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn, |
757 | unsigned long nr_pages, struct vmem_altmap *altmap) | |
f1dd2cd1 MH |
758 | { |
759 | struct pglist_data *pgdat = zone->zone_pgdat; | |
760 | int nid = pgdat->node_id; | |
761 | unsigned long flags; | |
df429ac0 | 762 | |
f1dd2cd1 MH |
763 | clear_zone_contiguous(zone); |
764 | ||
765 | /* TODO Huh pgdat is irqsave while zone is not. It used to be like that before */ | |
766 | pgdat_resize_lock(pgdat, &flags); | |
767 | zone_span_writelock(zone); | |
fa004ab7 WY |
768 | if (zone_is_empty(zone)) |
769 | init_currently_empty_zone(zone, start_pfn, nr_pages); | |
f1dd2cd1 MH |
770 | resize_zone_range(zone, start_pfn, nr_pages); |
771 | zone_span_writeunlock(zone); | |
772 | resize_pgdat_range(pgdat, start_pfn, nr_pages); | |
773 | pgdat_resize_unlock(pgdat, &flags); | |
774 | ||
775 | /* | |
776 | * TODO now we have a visible range of pages which are not associated | |
777 | * with their zone properly. Not nice but set_pfnblock_flags_mask | |
778 | * expects the zone spans the pfn range. All the pages in the range | |
779 | * are reserved so nobody should be touching them so we should be safe | |
780 | */ | |
a99583e7 CH |
781 | memmap_init_zone(nr_pages, nid, zone_idx(zone), start_pfn, |
782 | MEMMAP_HOTPLUG, altmap); | |
f1dd2cd1 MH |
783 | |
784 | set_zone_contiguous(zone); | |
785 | } | |
786 | ||
c246a213 MH |
787 | /* |
788 | * Returns a default kernel memory zone for the given pfn range. | |
789 | * If no kernel zone covers this pfn range it will automatically go | |
790 | * to the ZONE_NORMAL. | |
791 | */ | |
c6f03e29 | 792 | static struct zone *default_kernel_zone_for_pfn(int nid, unsigned long start_pfn, |
c246a213 MH |
793 | unsigned long nr_pages) |
794 | { | |
795 | struct pglist_data *pgdat = NODE_DATA(nid); | |
796 | int zid; | |
797 | ||
798 | for (zid = 0; zid <= ZONE_NORMAL; zid++) { | |
799 | struct zone *zone = &pgdat->node_zones[zid]; | |
800 | ||
801 | if (zone_intersects(zone, start_pfn, nr_pages)) | |
802 | return zone; | |
803 | } | |
804 | ||
805 | return &pgdat->node_zones[ZONE_NORMAL]; | |
806 | } | |
807 | ||
c6f03e29 MH |
808 | static inline struct zone *default_zone_for_pfn(int nid, unsigned long start_pfn, |
809 | unsigned long nr_pages) | |
e5e68930 | 810 | { |
c6f03e29 MH |
811 | struct zone *kernel_zone = default_kernel_zone_for_pfn(nid, start_pfn, |
812 | nr_pages); | |
813 | struct zone *movable_zone = &NODE_DATA(nid)->node_zones[ZONE_MOVABLE]; | |
814 | bool in_kernel = zone_intersects(kernel_zone, start_pfn, nr_pages); | |
815 | bool in_movable = zone_intersects(movable_zone, start_pfn, nr_pages); | |
e5e68930 MH |
816 | |
817 | /* | |
c6f03e29 MH |
818 | * We inherit the existing zone in a simple case where zones do not |
819 | * overlap in the given range | |
e5e68930 | 820 | */ |
c6f03e29 MH |
821 | if (in_kernel ^ in_movable) |
822 | return (in_kernel) ? kernel_zone : movable_zone; | |
9f123ab5 | 823 | |
c6f03e29 MH |
824 | /* |
825 | * If the range doesn't belong to any zone or two zones overlap in the | |
826 | * given range then we use movable zone only if movable_node is | |
827 | * enabled because we always online to a kernel zone by default. | |
828 | */ | |
829 | return movable_node_enabled ? movable_zone : kernel_zone; | |
9f123ab5 MH |
830 | } |
831 | ||
e5e68930 MH |
832 | struct zone * zone_for_pfn_range(int online_type, int nid, unsigned start_pfn, |
833 | unsigned long nr_pages) | |
f1dd2cd1 | 834 | { |
c6f03e29 MH |
835 | if (online_type == MMOP_ONLINE_KERNEL) |
836 | return default_kernel_zone_for_pfn(nid, start_pfn, nr_pages); | |
f1dd2cd1 | 837 | |
c6f03e29 MH |
838 | if (online_type == MMOP_ONLINE_MOVABLE) |
839 | return &NODE_DATA(nid)->node_zones[ZONE_MOVABLE]; | |
df429ac0 | 840 | |
c6f03e29 | 841 | return default_zone_for_pfn(nid, start_pfn, nr_pages); |
e5e68930 MH |
842 | } |
843 | ||
844 | /* | |
845 | * Associates the given pfn range with the given node and the zone appropriate | |
846 | * for the given online type. | |
847 | */ | |
848 | static struct zone * __meminit move_pfn_range(int online_type, int nid, | |
849 | unsigned long start_pfn, unsigned long nr_pages) | |
850 | { | |
851 | struct zone *zone; | |
852 | ||
853 | zone = zone_for_pfn_range(online_type, nid, start_pfn, nr_pages); | |
a99583e7 | 854 | move_pfn_range_to_zone(zone, start_pfn, nr_pages, NULL); |
f1dd2cd1 | 855 | return zone; |
df429ac0 | 856 | } |
75884fb1 | 857 | |
511c2aba | 858 | int __ref online_pages(unsigned long pfn, unsigned long nr_pages, int online_type) |
75884fb1 | 859 | { |
aa47228a | 860 | unsigned long flags; |
3947be19 DH |
861 | unsigned long onlined_pages = 0; |
862 | struct zone *zone; | |
6811378e | 863 | int need_zonelists_rebuild = 0; |
7b78d335 YG |
864 | int nid; |
865 | int ret; | |
866 | struct memory_notify arg; | |
d0dc12e8 PT |
867 | struct memory_block *mem; |
868 | ||
381eab4a DH |
869 | mem_hotplug_begin(); |
870 | ||
d0dc12e8 PT |
871 | /* |
872 | * We can't use pfn_to_nid() because nid might be stored in struct page | |
873 | * which is not yet initialized. Instead, we find nid from memory block. | |
874 | */ | |
875 | mem = find_memory_block(__pfn_to_section(pfn)); | |
876 | nid = mem->nid; | |
7b78d335 | 877 | |
f1dd2cd1 MH |
878 | /* associate pfn range with the zone */ |
879 | zone = move_pfn_range(online_type, nid, pfn, nr_pages); | |
880 | ||
7b78d335 YG |
881 | arg.start_pfn = pfn; |
882 | arg.nr_pages = nr_pages; | |
d9713679 | 883 | node_states_check_changes_online(nr_pages, zone, &arg); |
7b78d335 | 884 | |
7b78d335 YG |
885 | ret = memory_notify(MEM_GOING_ONLINE, &arg); |
886 | ret = notifier_to_errno(ret); | |
e33e33b4 CY |
887 | if (ret) |
888 | goto failed_addition; | |
889 | ||
6811378e YG |
890 | /* |
891 | * If this zone is not populated, then it is not in zonelist. | |
892 | * This means the page allocator ignores this zone. | |
893 | * So, zonelist must be updated after online. | |
894 | */ | |
6dcd73d7 | 895 | if (!populated_zone(zone)) { |
6811378e | 896 | need_zonelists_rebuild = 1; |
72675e13 | 897 | setup_zone_pageset(zone); |
6dcd73d7 | 898 | } |
6811378e | 899 | |
908eedc6 | 900 | ret = walk_system_ram_range(pfn, nr_pages, &onlined_pages, |
75884fb1 | 901 | online_pages_range); |
fd8a4221 | 902 | if (ret) { |
6dcd73d7 WC |
903 | if (need_zonelists_rebuild) |
904 | zone_pcp_reset(zone); | |
e33e33b4 | 905 | goto failed_addition; |
fd8a4221 GL |
906 | } |
907 | ||
3947be19 | 908 | zone->present_pages += onlined_pages; |
aa47228a CS |
909 | |
910 | pgdat_resize_lock(zone->zone_pgdat, &flags); | |
f2937be5 | 911 | zone->zone_pgdat->node_present_pages += onlined_pages; |
aa47228a CS |
912 | pgdat_resize_unlock(zone->zone_pgdat, &flags); |
913 | ||
08dff7b7 | 914 | if (onlined_pages) { |
e888ca35 | 915 | node_states_set_node(nid, &arg); |
08dff7b7 | 916 | if (need_zonelists_rebuild) |
72675e13 | 917 | build_all_zonelists(NULL); |
08dff7b7 JL |
918 | else |
919 | zone_pcp_update(zone); | |
920 | } | |
3947be19 | 921 | |
1b79acc9 KM |
922 | init_per_zone_wmark_min(); |
923 | ||
698b1b30 | 924 | if (onlined_pages) { |
e888ca35 | 925 | kswapd_run(nid); |
698b1b30 VB |
926 | kcompactd_run(nid); |
927 | } | |
61b13993 | 928 | |
1f522509 | 929 | vm_total_pages = nr_free_pagecache_pages(); |
2f7f24ec | 930 | |
2d1d43f6 | 931 | writeback_set_ratelimit(); |
7b78d335 YG |
932 | |
933 | if (onlined_pages) | |
934 | memory_notify(MEM_ONLINE, &arg); | |
381eab4a | 935 | mem_hotplug_done(); |
30467e0b | 936 | return 0; |
e33e33b4 CY |
937 | |
938 | failed_addition: | |
939 | pr_debug("online_pages [mem %#010llx-%#010llx] failed\n", | |
940 | (unsigned long long) pfn << PAGE_SHIFT, | |
941 | (((unsigned long long) pfn + nr_pages) << PAGE_SHIFT) - 1); | |
942 | memory_notify(MEM_CANCEL_ONLINE, &arg); | |
381eab4a | 943 | mem_hotplug_done(); |
e33e33b4 | 944 | return ret; |
3947be19 | 945 | } |
53947027 | 946 | #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ |
bc02af93 | 947 | |
0bd85420 TC |
948 | static void reset_node_present_pages(pg_data_t *pgdat) |
949 | { | |
950 | struct zone *z; | |
951 | ||
952 | for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++) | |
953 | z->present_pages = 0; | |
954 | ||
955 | pgdat->node_present_pages = 0; | |
956 | } | |
957 | ||
e1319331 HS |
958 | /* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */ |
959 | static pg_data_t __ref *hotadd_new_pgdat(int nid, u64 start) | |
9af3c2de YG |
960 | { |
961 | struct pglist_data *pgdat; | |
c8e861a5 | 962 | unsigned long start_pfn = PFN_DOWN(start); |
9af3c2de | 963 | |
a1e565aa TC |
964 | pgdat = NODE_DATA(nid); |
965 | if (!pgdat) { | |
966 | pgdat = arch_alloc_nodedata(nid); | |
967 | if (!pgdat) | |
968 | return NULL; | |
9af3c2de | 969 | |
a1e565aa | 970 | arch_refresh_nodedata(nid, pgdat); |
b0dc3a34 | 971 | } else { |
e716f2eb MG |
972 | /* |
973 | * Reset the nr_zones, order and classzone_idx before reuse. | |
974 | * Note that kswapd will init kswapd_classzone_idx properly | |
975 | * when it starts in the near future. | |
976 | */ | |
b0dc3a34 | 977 | pgdat->nr_zones = 0; |
38087d9b MG |
978 | pgdat->kswapd_order = 0; |
979 | pgdat->kswapd_classzone_idx = 0; | |
a1e565aa | 980 | } |
9af3c2de YG |
981 | |
982 | /* we can use NODE_DATA(nid) from here */ | |
983 | ||
03e85f9d OS |
984 | pgdat->node_id = nid; |
985 | pgdat->node_start_pfn = start_pfn; | |
986 | ||
9af3c2de | 987 | /* init node's zones as empty zones, we don't have any present pages.*/ |
03e85f9d | 988 | free_area_init_core_hotplug(nid); |
5830169f | 989 | pgdat->per_cpu_nodestats = alloc_percpu(struct per_cpu_nodestat); |
9af3c2de | 990 | |
959ecc48 KH |
991 | /* |
992 | * The node we allocated has no zone fallback lists. For avoiding | |
993 | * to access not-initialized zonelist, build here. | |
994 | */ | |
72675e13 | 995 | build_all_zonelists(pgdat); |
959ecc48 | 996 | |
0bd85420 TC |
997 | /* |
998 | * When memory is hot-added, all the memory is in offline state. So | |
999 | * clear all zones' present_pages because they will be updated in | |
1000 | * online_pages() and offline_pages(). | |
1001 | */ | |
03e85f9d | 1002 | reset_node_managed_pages(pgdat); |
0bd85420 TC |
1003 | reset_node_present_pages(pgdat); |
1004 | ||
9af3c2de YG |
1005 | return pgdat; |
1006 | } | |
1007 | ||
b9ff0360 | 1008 | static void rollback_node_hotadd(int nid) |
9af3c2de | 1009 | { |
b9ff0360 OS |
1010 | pg_data_t *pgdat = NODE_DATA(nid); |
1011 | ||
9af3c2de | 1012 | arch_refresh_nodedata(nid, NULL); |
5830169f | 1013 | free_percpu(pgdat->per_cpu_nodestats); |
9af3c2de YG |
1014 | arch_free_nodedata(pgdat); |
1015 | return; | |
1016 | } | |
1017 | ||
0a547039 | 1018 | |
01b0f197 TK |
1019 | /** |
1020 | * try_online_node - online a node if offlined | |
e8b098fc | 1021 | * @nid: the node ID |
b9ff0360 OS |
1022 | * @start: start addr of the node |
1023 | * @set_node_online: Whether we want to online the node | |
cf23422b | 1024 | * called by cpu_up() to online a node without onlined memory. |
b9ff0360 OS |
1025 | * |
1026 | * Returns: | |
1027 | * 1 -> a new node has been allocated | |
1028 | * 0 -> the node is already online | |
1029 | * -ENOMEM -> the node could not be allocated | |
cf23422b | 1030 | */ |
b9ff0360 | 1031 | static int __try_online_node(int nid, u64 start, bool set_node_online) |
cf23422b | 1032 | { |
b9ff0360 OS |
1033 | pg_data_t *pgdat; |
1034 | int ret = 1; | |
cf23422b | 1035 | |
01b0f197 TK |
1036 | if (node_online(nid)) |
1037 | return 0; | |
1038 | ||
b9ff0360 | 1039 | pgdat = hotadd_new_pgdat(nid, start); |
7553e8f2 | 1040 | if (!pgdat) { |
01b0f197 | 1041 | pr_err("Cannot online node %d due to NULL pgdat\n", nid); |
cf23422b | 1042 | ret = -ENOMEM; |
1043 | goto out; | |
1044 | } | |
b9ff0360 OS |
1045 | |
1046 | if (set_node_online) { | |
1047 | node_set_online(nid); | |
1048 | ret = register_one_node(nid); | |
1049 | BUG_ON(ret); | |
1050 | } | |
cf23422b | 1051 | out: |
b9ff0360 OS |
1052 | return ret; |
1053 | } | |
1054 | ||
1055 | /* | |
1056 | * Users of this function always want to online/register the node | |
1057 | */ | |
1058 | int try_online_node(int nid) | |
1059 | { | |
1060 | int ret; | |
1061 | ||
1062 | mem_hotplug_begin(); | |
1063 | ret = __try_online_node(nid, 0, true); | |
bfc8c901 | 1064 | mem_hotplug_done(); |
cf23422b | 1065 | return ret; |
1066 | } | |
1067 | ||
27356f54 TK |
1068 | static int check_hotplug_memory_range(u64 start, u64 size) |
1069 | { | |
ba325585 PT |
1070 | unsigned long block_sz = memory_block_size_bytes(); |
1071 | u64 block_nr_pages = block_sz >> PAGE_SHIFT; | |
27356f54 | 1072 | u64 nr_pages = size >> PAGE_SHIFT; |
ba325585 | 1073 | u64 start_pfn = PFN_DOWN(start); |
27356f54 | 1074 | |
ba325585 PT |
1075 | /* memory range must be block size aligned */ |
1076 | if (!nr_pages || !IS_ALIGNED(start_pfn, block_nr_pages) || | |
1077 | !IS_ALIGNED(nr_pages, block_nr_pages)) { | |
1078 | pr_err("Block size [%#lx] unaligned hotplug range: start %#llx, size %#llx", | |
1079 | block_sz, start, size); | |
27356f54 TK |
1080 | return -EINVAL; |
1081 | } | |
1082 | ||
1083 | return 0; | |
1084 | } | |
1085 | ||
31bc3858 VK |
1086 | static int online_memory_block(struct memory_block *mem, void *arg) |
1087 | { | |
dc18d706 | 1088 | return device_online(&mem->dev); |
31bc3858 VK |
1089 | } |
1090 | ||
8df1d0e4 DH |
1091 | /* |
1092 | * NOTE: The caller must call lock_device_hotplug() to serialize hotplug | |
1093 | * and online/offline operations (triggered e.g. by sysfs). | |
1094 | * | |
1095 | * we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG | |
1096 | */ | |
f29d8e9c | 1097 | int __ref add_memory_resource(int nid, struct resource *res) |
bc02af93 | 1098 | { |
62cedb9f | 1099 | u64 start, size; |
b9ff0360 | 1100 | bool new_node = false; |
bc02af93 YG |
1101 | int ret; |
1102 | ||
62cedb9f DV |
1103 | start = res->start; |
1104 | size = resource_size(res); | |
1105 | ||
27356f54 TK |
1106 | ret = check_hotplug_memory_range(start, size); |
1107 | if (ret) | |
1108 | return ret; | |
1109 | ||
bfc8c901 | 1110 | mem_hotplug_begin(); |
ac13c462 | 1111 | |
7f36e3e5 TC |
1112 | /* |
1113 | * Add new range to memblock so that when hotadd_new_pgdat() is called | |
1114 | * to allocate new pgdat, get_pfn_range_for_nid() will be able to find | |
1115 | * this new range and calculate total pages correctly. The range will | |
1116 | * be removed at hot-remove time. | |
1117 | */ | |
1118 | memblock_add_node(start, size, nid); | |
1119 | ||
b9ff0360 OS |
1120 | ret = __try_online_node(nid, start, false); |
1121 | if (ret < 0) | |
1122 | goto error; | |
1123 | new_node = ret; | |
9af3c2de | 1124 | |
bc02af93 | 1125 | /* call arch's memory hotadd */ |
24e6d5a5 | 1126 | ret = arch_add_memory(nid, start, size, NULL, true); |
9af3c2de YG |
1127 | if (ret < 0) |
1128 | goto error; | |
1129 | ||
a1e565aa | 1130 | if (new_node) { |
d5b6f6a3 | 1131 | /* If sysfs file of new node can't be created, cpu on the node |
0fc44159 YG |
1132 | * can't be hot-added. There is no rollback way now. |
1133 | * So, check by BUG_ON() to catch it reluctantly.. | |
d5b6f6a3 | 1134 | * We online node here. We can't roll back from here. |
0fc44159 | 1135 | */ |
d5b6f6a3 OS |
1136 | node_set_online(nid); |
1137 | ret = __register_one_node(nid); | |
0fc44159 YG |
1138 | BUG_ON(ret); |
1139 | } | |
1140 | ||
d5b6f6a3 | 1141 | /* link memory sections under this node.*/ |
4fbce633 | 1142 | ret = link_mem_sections(nid, PFN_DOWN(start), PFN_UP(start + size - 1)); |
d5b6f6a3 OS |
1143 | BUG_ON(ret); |
1144 | ||
d96ae530 | 1145 | /* create new memmap entry */ |
1146 | firmware_map_add_hotplug(start, start + size, "System RAM"); | |
1147 | ||
381eab4a DH |
1148 | /* device_online() will take the lock when calling online_pages() */ |
1149 | mem_hotplug_done(); | |
1150 | ||
31bc3858 | 1151 | /* online pages if requested */ |
f29d8e9c | 1152 | if (memhp_auto_online) |
31bc3858 VK |
1153 | walk_memory_range(PFN_DOWN(start), PFN_UP(start + size - 1), |
1154 | NULL, online_memory_block); | |
1155 | ||
381eab4a | 1156 | return ret; |
9af3c2de YG |
1157 | error: |
1158 | /* rollback pgdat allocation and others */ | |
b9ff0360 OS |
1159 | if (new_node) |
1160 | rollback_node_hotadd(nid); | |
7f36e3e5 | 1161 | memblock_remove(start, size); |
bfc8c901 | 1162 | mem_hotplug_done(); |
bc02af93 YG |
1163 | return ret; |
1164 | } | |
62cedb9f | 1165 | |
8df1d0e4 DH |
1166 | /* requires device_hotplug_lock, see add_memory_resource() */ |
1167 | int __ref __add_memory(int nid, u64 start, u64 size) | |
62cedb9f DV |
1168 | { |
1169 | struct resource *res; | |
1170 | int ret; | |
1171 | ||
1172 | res = register_memory_resource(start, size); | |
6f754ba4 VK |
1173 | if (IS_ERR(res)) |
1174 | return PTR_ERR(res); | |
62cedb9f | 1175 | |
f29d8e9c | 1176 | ret = add_memory_resource(nid, res); |
62cedb9f DV |
1177 | if (ret < 0) |
1178 | release_memory_resource(res); | |
1179 | return ret; | |
1180 | } | |
8df1d0e4 DH |
1181 | |
1182 | int add_memory(int nid, u64 start, u64 size) | |
1183 | { | |
1184 | int rc; | |
1185 | ||
1186 | lock_device_hotplug(); | |
1187 | rc = __add_memory(nid, start, size); | |
1188 | unlock_device_hotplug(); | |
1189 | ||
1190 | return rc; | |
1191 | } | |
bc02af93 | 1192 | EXPORT_SYMBOL_GPL(add_memory); |
0c0e6195 KH |
1193 | |
1194 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
5c755e9f BP |
1195 | /* |
1196 | * A free page on the buddy free lists (not the per-cpu lists) has PageBuddy | |
1197 | * set and the size of the free page is given by page_order(). Using this, | |
1198 | * the function determines if the pageblock contains only free pages. | |
1199 | * Due to buddy contraints, a free page at least the size of a pageblock will | |
1200 | * be located at the start of the pageblock | |
1201 | */ | |
1202 | static inline int pageblock_free(struct page *page) | |
1203 | { | |
1204 | return PageBuddy(page) && page_order(page) >= pageblock_order; | |
1205 | } | |
1206 | ||
891cb2a7 MH |
1207 | /* Return the pfn of the start of the next active pageblock after a given pfn */ |
1208 | static unsigned long next_active_pageblock(unsigned long pfn) | |
5c755e9f | 1209 | { |
891cb2a7 MH |
1210 | struct page *page = pfn_to_page(pfn); |
1211 | ||
5c755e9f | 1212 | /* Ensure the starting page is pageblock-aligned */ |
891cb2a7 | 1213 | BUG_ON(pfn & (pageblock_nr_pages - 1)); |
5c755e9f | 1214 | |
5c755e9f | 1215 | /* If the entire pageblock is free, move to the end of free page */ |
0dcc48c1 KH |
1216 | if (pageblock_free(page)) { |
1217 | int order; | |
1218 | /* be careful. we don't have locks, page_order can be changed.*/ | |
1219 | order = page_order(page); | |
1220 | if ((order < MAX_ORDER) && (order >= pageblock_order)) | |
891cb2a7 | 1221 | return pfn + (1 << order); |
0dcc48c1 | 1222 | } |
5c755e9f | 1223 | |
891cb2a7 | 1224 | return pfn + pageblock_nr_pages; |
5c755e9f BP |
1225 | } |
1226 | ||
891cb2a7 | 1227 | static bool is_pageblock_removable_nolock(unsigned long pfn) |
fb52bbae | 1228 | { |
891cb2a7 | 1229 | struct page *page = pfn_to_page(pfn); |
fb52bbae | 1230 | struct zone *zone; |
fb52bbae MM |
1231 | |
1232 | /* | |
1233 | * We have to be careful here because we are iterating over memory | |
1234 | * sections which are not zone aware so we might end up outside of | |
1235 | * the zone but still within the section. | |
1236 | * We have to take care about the node as well. If the node is offline | |
1237 | * its NODE_DATA will be NULL - see page_zone. | |
1238 | */ | |
1239 | if (!node_online(page_to_nid(page))) | |
1240 | return false; | |
1241 | ||
1242 | zone = page_zone(page); | |
1243 | pfn = page_to_pfn(page); | |
1244 | if (!zone_spans_pfn(zone, pfn)) | |
1245 | return false; | |
1246 | ||
d381c547 | 1247 | return !has_unmovable_pages(zone, page, 0, MIGRATE_MOVABLE, SKIP_HWPOISON); |
fb52bbae MM |
1248 | } |
1249 | ||
5c755e9f | 1250 | /* Checks if this range of memory is likely to be hot-removable. */ |
c98940f6 | 1251 | bool is_mem_section_removable(unsigned long start_pfn, unsigned long nr_pages) |
5c755e9f | 1252 | { |
891cb2a7 MH |
1253 | unsigned long end_pfn, pfn; |
1254 | ||
1255 | end_pfn = min(start_pfn + nr_pages, | |
1256 | zone_end_pfn(page_zone(pfn_to_page(start_pfn)))); | |
5c755e9f BP |
1257 | |
1258 | /* Check the starting page of each pageblock within the range */ | |
891cb2a7 MH |
1259 | for (pfn = start_pfn; pfn < end_pfn; pfn = next_active_pageblock(pfn)) { |
1260 | if (!is_pageblock_removable_nolock(pfn)) | |
c98940f6 | 1261 | return false; |
49ac8255 | 1262 | cond_resched(); |
5c755e9f BP |
1263 | } |
1264 | ||
1265 | /* All pageblocks in the memory block are likely to be hot-removable */ | |
c98940f6 | 1266 | return true; |
5c755e9f BP |
1267 | } |
1268 | ||
0c0e6195 | 1269 | /* |
deb88a2a | 1270 | * Confirm all pages in a range [start, end) belong to the same zone. |
a96dfddb | 1271 | * When true, return its valid [start, end). |
0c0e6195 | 1272 | */ |
a96dfddb TK |
1273 | int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn, |
1274 | unsigned long *valid_start, unsigned long *valid_end) | |
0c0e6195 | 1275 | { |
5f0f2887 | 1276 | unsigned long pfn, sec_end_pfn; |
a96dfddb | 1277 | unsigned long start, end; |
0c0e6195 KH |
1278 | struct zone *zone = NULL; |
1279 | struct page *page; | |
1280 | int i; | |
deb88a2a | 1281 | for (pfn = start_pfn, sec_end_pfn = SECTION_ALIGN_UP(start_pfn + 1); |
0c0e6195 | 1282 | pfn < end_pfn; |
deb88a2a | 1283 | pfn = sec_end_pfn, sec_end_pfn += PAGES_PER_SECTION) { |
5f0f2887 AB |
1284 | /* Make sure the memory section is present first */ |
1285 | if (!present_section_nr(pfn_to_section_nr(pfn))) | |
0c0e6195 | 1286 | continue; |
5f0f2887 AB |
1287 | for (; pfn < sec_end_pfn && pfn < end_pfn; |
1288 | pfn += MAX_ORDER_NR_PAGES) { | |
1289 | i = 0; | |
1290 | /* This is just a CONFIG_HOLES_IN_ZONE check.*/ | |
1291 | while ((i < MAX_ORDER_NR_PAGES) && | |
1292 | !pfn_valid_within(pfn + i)) | |
1293 | i++; | |
d6d8c8a4 | 1294 | if (i == MAX_ORDER_NR_PAGES || pfn + i >= end_pfn) |
5f0f2887 | 1295 | continue; |
24feb47c MZ |
1296 | /* Check if we got outside of the zone */ |
1297 | if (zone && !zone_spans_pfn(zone, pfn + i)) | |
1298 | return 0; | |
5f0f2887 AB |
1299 | page = pfn_to_page(pfn + i); |
1300 | if (zone && page_zone(page) != zone) | |
1301 | return 0; | |
a96dfddb TK |
1302 | if (!zone) |
1303 | start = pfn + i; | |
5f0f2887 | 1304 | zone = page_zone(page); |
a96dfddb | 1305 | end = pfn + MAX_ORDER_NR_PAGES; |
5f0f2887 | 1306 | } |
0c0e6195 | 1307 | } |
deb88a2a | 1308 | |
a96dfddb TK |
1309 | if (zone) { |
1310 | *valid_start = start; | |
d6d8c8a4 | 1311 | *valid_end = min(end, end_pfn); |
deb88a2a | 1312 | return 1; |
a96dfddb | 1313 | } else { |
deb88a2a | 1314 | return 0; |
a96dfddb | 1315 | } |
0c0e6195 KH |
1316 | } |
1317 | ||
1318 | /* | |
0efadf48 YX |
1319 | * Scan pfn range [start,end) to find movable/migratable pages (LRU pages, |
1320 | * non-lru movable pages and hugepages). We scan pfn because it's much | |
1321 | * easier than scanning over linked list. This function returns the pfn | |
1322 | * of the first found movable page if it's found, otherwise 0. | |
0c0e6195 | 1323 | */ |
c8721bbb | 1324 | static unsigned long scan_movable_pages(unsigned long start, unsigned long end) |
0c0e6195 KH |
1325 | { |
1326 | unsigned long pfn; | |
eeb0efd0 | 1327 | |
0c0e6195 | 1328 | for (pfn = start; pfn < end; pfn++) { |
eeb0efd0 OS |
1329 | struct page *page, *head; |
1330 | unsigned long skip; | |
1331 | ||
1332 | if (!pfn_valid(pfn)) | |
1333 | continue; | |
1334 | page = pfn_to_page(pfn); | |
1335 | if (PageLRU(page)) | |
1336 | return pfn; | |
1337 | if (__PageMovable(page)) | |
1338 | return pfn; | |
1339 | ||
1340 | if (!PageHuge(page)) | |
1341 | continue; | |
1342 | head = compound_head(page); | |
1343 | if (hugepage_migration_supported(page_hstate(head)) && | |
1344 | page_huge_active(head)) | |
1345 | return pfn; | |
1346 | skip = (1 << compound_order(head)) - (page - head); | |
1347 | pfn += skip - 1; | |
0c0e6195 KH |
1348 | } |
1349 | return 0; | |
1350 | } | |
1351 | ||
666feb21 | 1352 | static struct page *new_node_page(struct page *page, unsigned long private) |
394e31d2 | 1353 | { |
394e31d2 | 1354 | int nid = page_to_nid(page); |
231e97e2 | 1355 | nodemask_t nmask = node_states[N_MEMORY]; |
7f252f27 MH |
1356 | |
1357 | /* | |
1358 | * try to allocate from a different node but reuse this node if there | |
1359 | * are no other online nodes to be used (e.g. we are offlining a part | |
1360 | * of the only existing node) | |
1361 | */ | |
1362 | node_clear(nid, nmask); | |
1363 | if (nodes_empty(nmask)) | |
1364 | node_set(nid, nmask); | |
394e31d2 | 1365 | |
8b913238 | 1366 | return new_page_nodemask(page, nid, &nmask); |
394e31d2 XQ |
1367 | } |
1368 | ||
0c0e6195 KH |
1369 | static int |
1370 | do_migrate_range(unsigned long start_pfn, unsigned long end_pfn) | |
1371 | { | |
1372 | unsigned long pfn; | |
1373 | struct page *page; | |
0c0e6195 KH |
1374 | int ret = 0; |
1375 | LIST_HEAD(source); | |
1376 | ||
a85009c3 | 1377 | for (pfn = start_pfn; pfn < end_pfn; pfn++) { |
0c0e6195 KH |
1378 | if (!pfn_valid(pfn)) |
1379 | continue; | |
1380 | page = pfn_to_page(pfn); | |
c8721bbb NH |
1381 | |
1382 | if (PageHuge(page)) { | |
1383 | struct page *head = compound_head(page); | |
c8721bbb NH |
1384 | if (compound_order(head) > PFN_SECTION_SHIFT) { |
1385 | ret = -EBUSY; | |
1386 | break; | |
1387 | } | |
daf3538a OS |
1388 | pfn = page_to_pfn(head) + (1<<compound_order(head)) - 1; |
1389 | isolate_huge_page(head, &source); | |
c8721bbb | 1390 | continue; |
94723aaf | 1391 | } else if (PageTransHuge(page)) |
8135d892 NH |
1392 | pfn = page_to_pfn(compound_head(page)) |
1393 | + hpage_nr_pages(page) - 1; | |
c8721bbb | 1394 | |
b15c8726 MH |
1395 | /* |
1396 | * HWPoison pages have elevated reference counts so the migration would | |
1397 | * fail on them. It also doesn't make any sense to migrate them in the | |
1398 | * first place. Still try to unmap such a page in case it is still mapped | |
1399 | * (e.g. current hwpoison implementation doesn't unmap KSM pages but keep | |
1400 | * the unmap as the catch all safety net). | |
1401 | */ | |
1402 | if (PageHWPoison(page)) { | |
1403 | if (WARN_ON(PageLRU(page))) | |
1404 | isolate_lru_page(page); | |
1405 | if (page_mapped(page)) | |
1406 | try_to_unmap(page, TTU_IGNORE_MLOCK | TTU_IGNORE_ACCESS); | |
1407 | continue; | |
1408 | } | |
1409 | ||
700c2a46 | 1410 | if (!get_page_unless_zero(page)) |
0c0e6195 KH |
1411 | continue; |
1412 | /* | |
0efadf48 YX |
1413 | * We can skip free pages. And we can deal with pages on |
1414 | * LRU and non-lru movable pages. | |
0c0e6195 | 1415 | */ |
0efadf48 YX |
1416 | if (PageLRU(page)) |
1417 | ret = isolate_lru_page(page); | |
1418 | else | |
1419 | ret = isolate_movable_page(page, ISOLATE_UNEVICTABLE); | |
0c0e6195 | 1420 | if (!ret) { /* Success */ |
62695a84 | 1421 | list_add_tail(&page->lru, &source); |
0efadf48 YX |
1422 | if (!__PageMovable(page)) |
1423 | inc_node_page_state(page, NR_ISOLATED_ANON + | |
1424 | page_is_file_cache(page)); | |
6d9c285a | 1425 | |
0c0e6195 | 1426 | } else { |
2932c8b0 | 1427 | pr_warn("failed to isolate pfn %lx\n", pfn); |
0efadf48 | 1428 | dump_page(page, "isolation failed"); |
0c0e6195 | 1429 | } |
1723058e | 1430 | put_page(page); |
0c0e6195 | 1431 | } |
f3ab2636 | 1432 | if (!list_empty(&source)) { |
394e31d2 XQ |
1433 | /* Allocate a new page from the nearest neighbor node */ |
1434 | ret = migrate_pages(&source, new_node_page, NULL, 0, | |
9c620e2b | 1435 | MIGRATE_SYNC, MR_MEMORY_HOTPLUG); |
2932c8b0 MH |
1436 | if (ret) { |
1437 | list_for_each_entry(page, &source, lru) { | |
1438 | pr_warn("migrating pfn %lx failed ret:%d ", | |
1439 | page_to_pfn(page), ret); | |
1440 | dump_page(page, "migration failure"); | |
1441 | } | |
c8721bbb | 1442 | putback_movable_pages(&source); |
2932c8b0 | 1443 | } |
0c0e6195 | 1444 | } |
1723058e | 1445 | |
0c0e6195 KH |
1446 | return ret; |
1447 | } | |
1448 | ||
1449 | /* | |
1450 | * remove from free_area[] and mark all as Reserved. | |
1451 | */ | |
1452 | static int | |
1453 | offline_isolated_pages_cb(unsigned long start, unsigned long nr_pages, | |
1454 | void *data) | |
1455 | { | |
1456 | __offline_isolated_pages(start, start + nr_pages); | |
1457 | return 0; | |
1458 | } | |
1459 | ||
1460 | static void | |
1461 | offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn) | |
1462 | { | |
908eedc6 | 1463 | walk_system_ram_range(start_pfn, end_pfn - start_pfn, NULL, |
0c0e6195 KH |
1464 | offline_isolated_pages_cb); |
1465 | } | |
1466 | ||
1467 | /* | |
1468 | * Check all pages in range, recoreded as memory resource, are isolated. | |
1469 | */ | |
1470 | static int | |
1471 | check_pages_isolated_cb(unsigned long start_pfn, unsigned long nr_pages, | |
1472 | void *data) | |
1473 | { | |
1474 | int ret; | |
1475 | long offlined = *(long *)data; | |
b023f468 | 1476 | ret = test_pages_isolated(start_pfn, start_pfn + nr_pages, true); |
0c0e6195 KH |
1477 | offlined = nr_pages; |
1478 | if (!ret) | |
1479 | *(long *)data += offlined; | |
1480 | return ret; | |
1481 | } | |
1482 | ||
1483 | static long | |
1484 | check_pages_isolated(unsigned long start_pfn, unsigned long end_pfn) | |
1485 | { | |
1486 | long offlined = 0; | |
1487 | int ret; | |
1488 | ||
908eedc6 | 1489 | ret = walk_system_ram_range(start_pfn, end_pfn - start_pfn, &offlined, |
0c0e6195 KH |
1490 | check_pages_isolated_cb); |
1491 | if (ret < 0) | |
1492 | offlined = (long)ret; | |
1493 | return offlined; | |
1494 | } | |
1495 | ||
c5320926 TC |
1496 | static int __init cmdline_parse_movable_node(char *p) |
1497 | { | |
4932381e | 1498 | #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP |
55ac590c | 1499 | movable_node_enabled = true; |
4932381e MH |
1500 | #else |
1501 | pr_warn("movable_node parameter depends on CONFIG_HAVE_MEMBLOCK_NODE_MAP to work properly\n"); | |
1502 | #endif | |
c5320926 TC |
1503 | return 0; |
1504 | } | |
1505 | early_param("movable_node", cmdline_parse_movable_node); | |
1506 | ||
d9713679 LJ |
1507 | /* check which state of node_states will be changed when offline memory */ |
1508 | static void node_states_check_changes_offline(unsigned long nr_pages, | |
1509 | struct zone *zone, struct memory_notify *arg) | |
1510 | { | |
1511 | struct pglist_data *pgdat = zone->zone_pgdat; | |
1512 | unsigned long present_pages = 0; | |
86b27bea | 1513 | enum zone_type zt; |
d9713679 | 1514 | |
98fa15f3 AK |
1515 | arg->status_change_nid = NUMA_NO_NODE; |
1516 | arg->status_change_nid_normal = NUMA_NO_NODE; | |
1517 | arg->status_change_nid_high = NUMA_NO_NODE; | |
d9713679 LJ |
1518 | |
1519 | /* | |
86b27bea OS |
1520 | * Check whether node_states[N_NORMAL_MEMORY] will be changed. |
1521 | * If the memory to be offline is within the range | |
1522 | * [0..ZONE_NORMAL], and it is the last present memory there, | |
1523 | * the zones in that range will become empty after the offlining, | |
1524 | * thus we can determine that we need to clear the node from | |
1525 | * node_states[N_NORMAL_MEMORY]. | |
d9713679 | 1526 | */ |
86b27bea | 1527 | for (zt = 0; zt <= ZONE_NORMAL; zt++) |
d9713679 | 1528 | present_pages += pgdat->node_zones[zt].present_pages; |
86b27bea | 1529 | if (zone_idx(zone) <= ZONE_NORMAL && nr_pages >= present_pages) |
d9713679 | 1530 | arg->status_change_nid_normal = zone_to_nid(zone); |
d9713679 | 1531 | |
6715ddf9 LJ |
1532 | #ifdef CONFIG_HIGHMEM |
1533 | /* | |
86b27bea OS |
1534 | * node_states[N_HIGH_MEMORY] contains nodes which |
1535 | * have normal memory or high memory. | |
1536 | * Here we add the present_pages belonging to ZONE_HIGHMEM. | |
1537 | * If the zone is within the range of [0..ZONE_HIGHMEM), and | |
1538 | * we determine that the zones in that range become empty, | |
1539 | * we need to clear the node for N_HIGH_MEMORY. | |
6715ddf9 | 1540 | */ |
86b27bea OS |
1541 | present_pages += pgdat->node_zones[ZONE_HIGHMEM].present_pages; |
1542 | if (zone_idx(zone) <= ZONE_HIGHMEM && nr_pages >= present_pages) | |
6715ddf9 | 1543 | arg->status_change_nid_high = zone_to_nid(zone); |
6715ddf9 LJ |
1544 | #endif |
1545 | ||
d9713679 | 1546 | /* |
86b27bea OS |
1547 | * We have accounted the pages from [0..ZONE_NORMAL), and |
1548 | * in case of CONFIG_HIGHMEM the pages from ZONE_HIGHMEM | |
1549 | * as well. | |
1550 | * Here we count the possible pages from ZONE_MOVABLE. | |
1551 | * If after having accounted all the pages, we see that the nr_pages | |
1552 | * to be offlined is over or equal to the accounted pages, | |
1553 | * we know that the node will become empty, and so, we can clear | |
1554 | * it for N_MEMORY as well. | |
d9713679 | 1555 | */ |
86b27bea | 1556 | present_pages += pgdat->node_zones[ZONE_MOVABLE].present_pages; |
d9713679 | 1557 | |
d9713679 LJ |
1558 | if (nr_pages >= present_pages) |
1559 | arg->status_change_nid = zone_to_nid(zone); | |
d9713679 LJ |
1560 | } |
1561 | ||
1562 | static void node_states_clear_node(int node, struct memory_notify *arg) | |
1563 | { | |
1564 | if (arg->status_change_nid_normal >= 0) | |
1565 | node_clear_state(node, N_NORMAL_MEMORY); | |
1566 | ||
cf01f6f5 | 1567 | if (arg->status_change_nid_high >= 0) |
d9713679 | 1568 | node_clear_state(node, N_HIGH_MEMORY); |
6715ddf9 | 1569 | |
cf01f6f5 | 1570 | if (arg->status_change_nid >= 0) |
6715ddf9 | 1571 | node_clear_state(node, N_MEMORY); |
d9713679 LJ |
1572 | } |
1573 | ||
a16cee10 | 1574 | static int __ref __offline_pages(unsigned long start_pfn, |
ecde0f3e | 1575 | unsigned long end_pfn) |
0c0e6195 | 1576 | { |
ecde0f3e | 1577 | unsigned long pfn, nr_pages; |
0c0e6195 | 1578 | long offlined_pages; |
72b39cfc | 1579 | int ret, node; |
d702909f | 1580 | unsigned long flags; |
a96dfddb | 1581 | unsigned long valid_start, valid_end; |
0c0e6195 | 1582 | struct zone *zone; |
7b78d335 | 1583 | struct memory_notify arg; |
79605093 | 1584 | char *reason; |
0c0e6195 | 1585 | |
381eab4a DH |
1586 | mem_hotplug_begin(); |
1587 | ||
0c0e6195 KH |
1588 | /* This makes hotplug much easier...and readable. |
1589 | we assume this for now. .*/ | |
381eab4a DH |
1590 | if (!test_pages_in_a_zone(start_pfn, end_pfn, &valid_start, |
1591 | &valid_end)) { | |
79605093 MH |
1592 | ret = -EINVAL; |
1593 | reason = "multizone range"; | |
1594 | goto failed_removal; | |
381eab4a | 1595 | } |
7b78d335 | 1596 | |
a96dfddb | 1597 | zone = page_zone(pfn_to_page(valid_start)); |
7b78d335 YG |
1598 | node = zone_to_nid(zone); |
1599 | nr_pages = end_pfn - start_pfn; | |
1600 | ||
0c0e6195 | 1601 | /* set above range as isolated */ |
b023f468 | 1602 | ret = start_isolate_page_range(start_pfn, end_pfn, |
d381c547 MH |
1603 | MIGRATE_MOVABLE, |
1604 | SKIP_HWPOISON | REPORT_FAILURE); | |
381eab4a | 1605 | if (ret) { |
79605093 MH |
1606 | reason = "failure to isolate range"; |
1607 | goto failed_removal; | |
381eab4a | 1608 | } |
7b78d335 YG |
1609 | |
1610 | arg.start_pfn = start_pfn; | |
1611 | arg.nr_pages = nr_pages; | |
d9713679 | 1612 | node_states_check_changes_offline(nr_pages, zone, &arg); |
7b78d335 YG |
1613 | |
1614 | ret = memory_notify(MEM_GOING_OFFLINE, &arg); | |
1615 | ret = notifier_to_errno(ret); | |
79605093 MH |
1616 | if (ret) { |
1617 | reason = "notifier failure"; | |
1618 | goto failed_removal_isolated; | |
1619 | } | |
7b78d335 | 1620 | |
bb8965bd MH |
1621 | do { |
1622 | for (pfn = start_pfn; pfn;) { | |
1623 | if (signal_pending(current)) { | |
1624 | ret = -EINTR; | |
1625 | reason = "signal backoff"; | |
1626 | goto failed_removal_isolated; | |
1627 | } | |
72b39cfc | 1628 | |
bb8965bd MH |
1629 | cond_resched(); |
1630 | lru_add_drain_all(); | |
bb8965bd MH |
1631 | |
1632 | pfn = scan_movable_pages(pfn, end_pfn); | |
1633 | if (pfn) { | |
1634 | /* | |
1635 | * TODO: fatal migration failures should bail | |
1636 | * out | |
1637 | */ | |
1638 | do_migrate_range(pfn, end_pfn); | |
1639 | } | |
1640 | } | |
0c0e6195 | 1641 | |
bb8965bd MH |
1642 | /* |
1643 | * Dissolve free hugepages in the memory block before doing | |
1644 | * offlining actually in order to make hugetlbfs's object | |
1645 | * counting consistent. | |
1646 | */ | |
1647 | ret = dissolve_free_huge_pages(start_pfn, end_pfn); | |
1648 | if (ret) { | |
1649 | reason = "failure to dissolve huge pages"; | |
1650 | goto failed_removal_isolated; | |
1651 | } | |
1652 | /* check again */ | |
1653 | offlined_pages = check_pages_isolated(start_pfn, end_pfn); | |
1654 | } while (offlined_pages < 0); | |
72b39cfc | 1655 | |
e33e33b4 | 1656 | pr_info("Offlined Pages %ld\n", offlined_pages); |
b3834be5 | 1657 | /* Ok, all of our target is isolated. |
0c0e6195 KH |
1658 | We cannot do rollback at this point. */ |
1659 | offline_isolated_pages(start_pfn, end_pfn); | |
dbc0e4ce | 1660 | /* reset pagetype flags and makes migrate type to be MOVABLE */ |
0815f3d8 | 1661 | undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE); |
0c0e6195 | 1662 | /* removal success */ |
3dcc0571 | 1663 | adjust_managed_page_count(pfn_to_page(start_pfn), -offlined_pages); |
0c0e6195 | 1664 | zone->present_pages -= offlined_pages; |
d702909f CS |
1665 | |
1666 | pgdat_resize_lock(zone->zone_pgdat, &flags); | |
0c0e6195 | 1667 | zone->zone_pgdat->node_present_pages -= offlined_pages; |
d702909f | 1668 | pgdat_resize_unlock(zone->zone_pgdat, &flags); |
7b78d335 | 1669 | |
1b79acc9 KM |
1670 | init_per_zone_wmark_min(); |
1671 | ||
1e8537ba | 1672 | if (!populated_zone(zone)) { |
340175b7 | 1673 | zone_pcp_reset(zone); |
72675e13 | 1674 | build_all_zonelists(NULL); |
1e8537ba XQ |
1675 | } else |
1676 | zone_pcp_update(zone); | |
340175b7 | 1677 | |
d9713679 | 1678 | node_states_clear_node(node, &arg); |
698b1b30 | 1679 | if (arg.status_change_nid >= 0) { |
8fe23e05 | 1680 | kswapd_stop(node); |
698b1b30 VB |
1681 | kcompactd_stop(node); |
1682 | } | |
bce7394a | 1683 | |
0c0e6195 KH |
1684 | vm_total_pages = nr_free_pagecache_pages(); |
1685 | writeback_set_ratelimit(); | |
7b78d335 YG |
1686 | |
1687 | memory_notify(MEM_OFFLINE, &arg); | |
381eab4a | 1688 | mem_hotplug_done(); |
0c0e6195 KH |
1689 | return 0; |
1690 | ||
79605093 MH |
1691 | failed_removal_isolated: |
1692 | undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE); | |
0c0e6195 | 1693 | failed_removal: |
79605093 | 1694 | pr_debug("memory offlining [mem %#010llx-%#010llx] failed due to %s\n", |
e33e33b4 | 1695 | (unsigned long long) start_pfn << PAGE_SHIFT, |
79605093 MH |
1696 | ((unsigned long long) end_pfn << PAGE_SHIFT) - 1, |
1697 | reason); | |
7b78d335 | 1698 | memory_notify(MEM_CANCEL_OFFLINE, &arg); |
0c0e6195 | 1699 | /* pushback to free area */ |
381eab4a | 1700 | mem_hotplug_done(); |
0c0e6195 KH |
1701 | return ret; |
1702 | } | |
71088785 | 1703 | |
a16cee10 WC |
1704 | int offline_pages(unsigned long start_pfn, unsigned long nr_pages) |
1705 | { | |
ecde0f3e | 1706 | return __offline_pages(start_pfn, start_pfn + nr_pages); |
a16cee10 | 1707 | } |
e2ff3940 | 1708 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
a16cee10 | 1709 | |
bbc76be6 WC |
1710 | /** |
1711 | * walk_memory_range - walks through all mem sections in [start_pfn, end_pfn) | |
1712 | * @start_pfn: start pfn of the memory range | |
e05c4bbf | 1713 | * @end_pfn: end pfn of the memory range |
bbc76be6 WC |
1714 | * @arg: argument passed to func |
1715 | * @func: callback for each memory section walked | |
1716 | * | |
1717 | * This function walks through all present mem sections in range | |
1718 | * [start_pfn, end_pfn) and call func on each mem section. | |
1719 | * | |
1720 | * Returns the return value of func. | |
1721 | */ | |
e2ff3940 | 1722 | int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn, |
bbc76be6 | 1723 | void *arg, int (*func)(struct memory_block *, void *)) |
71088785 | 1724 | { |
e90bdb7f WC |
1725 | struct memory_block *mem = NULL; |
1726 | struct mem_section *section; | |
e90bdb7f WC |
1727 | unsigned long pfn, section_nr; |
1728 | int ret; | |
e90bdb7f WC |
1729 | |
1730 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { | |
1731 | section_nr = pfn_to_section_nr(pfn); | |
1732 | if (!present_section_nr(section_nr)) | |
1733 | continue; | |
1734 | ||
1735 | section = __nr_to_section(section_nr); | |
1736 | /* same memblock? */ | |
1737 | if (mem) | |
1738 | if ((section_nr >= mem->start_section_nr) && | |
1739 | (section_nr <= mem->end_section_nr)) | |
1740 | continue; | |
1741 | ||
1742 | mem = find_memory_block_hinted(section, mem); | |
1743 | if (!mem) | |
1744 | continue; | |
1745 | ||
bbc76be6 | 1746 | ret = func(mem, arg); |
e90bdb7f | 1747 | if (ret) { |
bbc76be6 WC |
1748 | kobject_put(&mem->dev.kobj); |
1749 | return ret; | |
e90bdb7f WC |
1750 | } |
1751 | } | |
1752 | ||
1753 | if (mem) | |
1754 | kobject_put(&mem->dev.kobj); | |
1755 | ||
bbc76be6 WC |
1756 | return 0; |
1757 | } | |
1758 | ||
e2ff3940 | 1759 | #ifdef CONFIG_MEMORY_HOTREMOVE |
d6de9d53 | 1760 | static int check_memblock_offlined_cb(struct memory_block *mem, void *arg) |
bbc76be6 WC |
1761 | { |
1762 | int ret = !is_memblock_offlined(mem); | |
1763 | ||
349daa0f RD |
1764 | if (unlikely(ret)) { |
1765 | phys_addr_t beginpa, endpa; | |
1766 | ||
1767 | beginpa = PFN_PHYS(section_nr_to_pfn(mem->start_section_nr)); | |
1768 | endpa = PFN_PHYS(section_nr_to_pfn(mem->end_section_nr + 1))-1; | |
756a025f | 1769 | pr_warn("removing memory fails, because memory [%pa-%pa] is onlined\n", |
349daa0f RD |
1770 | &beginpa, &endpa); |
1771 | } | |
bbc76be6 WC |
1772 | |
1773 | return ret; | |
1774 | } | |
1775 | ||
0f1cfe9d | 1776 | static int check_cpu_on_node(pg_data_t *pgdat) |
60a5a19e | 1777 | { |
60a5a19e TC |
1778 | int cpu; |
1779 | ||
1780 | for_each_present_cpu(cpu) { | |
1781 | if (cpu_to_node(cpu) == pgdat->node_id) | |
1782 | /* | |
1783 | * the cpu on this node isn't removed, and we can't | |
1784 | * offline this node. | |
1785 | */ | |
1786 | return -EBUSY; | |
1787 | } | |
1788 | ||
1789 | return 0; | |
1790 | } | |
1791 | ||
0f1cfe9d TK |
1792 | /** |
1793 | * try_offline_node | |
e8b098fc | 1794 | * @nid: the node ID |
0f1cfe9d TK |
1795 | * |
1796 | * Offline a node if all memory sections and cpus of the node are removed. | |
1797 | * | |
1798 | * NOTE: The caller must call lock_device_hotplug() to serialize hotplug | |
1799 | * and online/offline operations before this call. | |
1800 | */ | |
90b30cdc | 1801 | void try_offline_node(int nid) |
60a5a19e | 1802 | { |
d822b86a WC |
1803 | pg_data_t *pgdat = NODE_DATA(nid); |
1804 | unsigned long start_pfn = pgdat->node_start_pfn; | |
1805 | unsigned long end_pfn = start_pfn + pgdat->node_spanned_pages; | |
60a5a19e TC |
1806 | unsigned long pfn; |
1807 | ||
1808 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { | |
1809 | unsigned long section_nr = pfn_to_section_nr(pfn); | |
1810 | ||
1811 | if (!present_section_nr(section_nr)) | |
1812 | continue; | |
1813 | ||
1814 | if (pfn_to_nid(pfn) != nid) | |
1815 | continue; | |
1816 | ||
1817 | /* | |
1818 | * some memory sections of this node are not removed, and we | |
1819 | * can't offline node now. | |
1820 | */ | |
1821 | return; | |
1822 | } | |
1823 | ||
46a3679b | 1824 | if (check_cpu_on_node(pgdat)) |
60a5a19e TC |
1825 | return; |
1826 | ||
1827 | /* | |
1828 | * all memory/cpu of this node are removed, we can offline this | |
1829 | * node now. | |
1830 | */ | |
1831 | node_set_offline(nid); | |
1832 | unregister_one_node(nid); | |
1833 | } | |
90b30cdc | 1834 | EXPORT_SYMBOL(try_offline_node); |
60a5a19e | 1835 | |
0f1cfe9d TK |
1836 | /** |
1837 | * remove_memory | |
e8b098fc MR |
1838 | * @nid: the node ID |
1839 | * @start: physical address of the region to remove | |
1840 | * @size: size of the region to remove | |
0f1cfe9d TK |
1841 | * |
1842 | * NOTE: The caller must call lock_device_hotplug() to serialize hotplug | |
1843 | * and online/offline operations before this call, as required by | |
1844 | * try_offline_node(). | |
1845 | */ | |
d15e5926 | 1846 | void __ref __remove_memory(int nid, u64 start, u64 size) |
bbc76be6 | 1847 | { |
242831eb | 1848 | int ret; |
993c1aad | 1849 | |
27356f54 TK |
1850 | BUG_ON(check_hotplug_memory_range(start, size)); |
1851 | ||
bfc8c901 | 1852 | mem_hotplug_begin(); |
6677e3ea YI |
1853 | |
1854 | /* | |
242831eb RW |
1855 | * All memory blocks must be offlined before removing memory. Check |
1856 | * whether all memory blocks in question are offline and trigger a BUG() | |
1857 | * if this is not the case. | |
6677e3ea | 1858 | */ |
242831eb | 1859 | ret = walk_memory_range(PFN_DOWN(start), PFN_UP(start + size - 1), NULL, |
d6de9d53 | 1860 | check_memblock_offlined_cb); |
bfc8c901 | 1861 | if (ret) |
242831eb | 1862 | BUG(); |
6677e3ea | 1863 | |
46c66c4b YI |
1864 | /* remove memmap entry */ |
1865 | firmware_map_remove(start, start + size, "System RAM"); | |
f9126ab9 XQ |
1866 | memblock_free(start, size); |
1867 | memblock_remove(start, size); | |
46c66c4b | 1868 | |
2c2a5af6 | 1869 | arch_remove_memory(nid, start, size, NULL); |
24d335ca | 1870 | |
60a5a19e TC |
1871 | try_offline_node(nid); |
1872 | ||
bfc8c901 | 1873 | mem_hotplug_done(); |
71088785 | 1874 | } |
d15e5926 DH |
1875 | |
1876 | void remove_memory(int nid, u64 start, u64 size) | |
1877 | { | |
1878 | lock_device_hotplug(); | |
1879 | __remove_memory(nid, start, size); | |
1880 | unlock_device_hotplug(); | |
1881 | } | |
71088785 | 1882 | EXPORT_SYMBOL_GPL(remove_memory); |
aba6efc4 | 1883 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |