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Commit | Line | Data |
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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> | |
9 | #include <linux/swap.h> | |
10 | #include <linux/interrupt.h> | |
11 | #include <linux/pagemap.h> | |
12 | #include <linux/bootmem.h> | |
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> | |
21 | #include <linux/memory_hotplug.h> | |
22 | #include <linux/highmem.h> | |
23 | #include <linux/vmalloc.h> | |
0a547039 | 24 | #include <linux/ioport.h> |
0c0e6195 KH |
25 | #include <linux/delay.h> |
26 | #include <linux/migrate.h> | |
27 | #include <linux/page-isolation.h> | |
71088785 | 28 | #include <linux/pfn.h> |
6ad696d2 | 29 | #include <linux/suspend.h> |
6d9c285a | 30 | #include <linux/mm_inline.h> |
d96ae530 | 31 | #include <linux/firmware-map.h> |
60a5a19e | 32 | #include <linux/stop_machine.h> |
3947be19 DH |
33 | |
34 | #include <asm/tlbflush.h> | |
35 | ||
1e5ad9a3 AB |
36 | #include "internal.h" |
37 | ||
9d0ad8ca DK |
38 | /* |
39 | * online_page_callback contains pointer to current page onlining function. | |
40 | * Initially it is generic_online_page(). If it is required it could be | |
41 | * changed by calling set_online_page_callback() for callback registration | |
42 | * and restore_online_page_callback() for generic callback restore. | |
43 | */ | |
44 | ||
45 | static void generic_online_page(struct page *page); | |
46 | ||
47 | static online_page_callback_t online_page_callback = generic_online_page; | |
48 | ||
20d6c96b KM |
49 | DEFINE_MUTEX(mem_hotplug_mutex); |
50 | ||
51 | void lock_memory_hotplug(void) | |
52 | { | |
53 | mutex_lock(&mem_hotplug_mutex); | |
54 | ||
55 | /* for exclusive hibernation if CONFIG_HIBERNATION=y */ | |
56 | lock_system_sleep(); | |
57 | } | |
58 | ||
59 | void unlock_memory_hotplug(void) | |
60 | { | |
61 | unlock_system_sleep(); | |
62 | mutex_unlock(&mem_hotplug_mutex); | |
63 | } | |
64 | ||
65 | ||
45e0b78b KM |
66 | /* add this memory to iomem resource */ |
67 | static struct resource *register_memory_resource(u64 start, u64 size) | |
68 | { | |
69 | struct resource *res; | |
70 | res = kzalloc(sizeof(struct resource), GFP_KERNEL); | |
71 | BUG_ON(!res); | |
72 | ||
73 | res->name = "System RAM"; | |
74 | res->start = start; | |
75 | res->end = start + size - 1; | |
887c3cb1 | 76 | res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; |
45e0b78b | 77 | if (request_resource(&iomem_resource, res) < 0) { |
a62e2f4f | 78 | printk("System RAM resource %pR cannot be added\n", res); |
45e0b78b KM |
79 | kfree(res); |
80 | res = NULL; | |
81 | } | |
82 | return res; | |
83 | } | |
84 | ||
85 | static void release_memory_resource(struct resource *res) | |
86 | { | |
87 | if (!res) | |
88 | return; | |
89 | release_resource(res); | |
90 | kfree(res); | |
91 | return; | |
92 | } | |
93 | ||
53947027 | 94 | #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE |
46723bfa YI |
95 | void get_page_bootmem(unsigned long info, struct page *page, |
96 | unsigned long type) | |
04753278 | 97 | { |
5f24ce5f | 98 | page->lru.next = (struct list_head *) type; |
04753278 YG |
99 | SetPagePrivate(page); |
100 | set_page_private(page, info); | |
101 | atomic_inc(&page->_count); | |
102 | } | |
103 | ||
23ce932a RM |
104 | /* reference to __meminit __free_pages_bootmem is valid |
105 | * so use __ref to tell modpost not to generate a warning */ | |
106 | void __ref put_page_bootmem(struct page *page) | |
04753278 | 107 | { |
5f24ce5f | 108 | unsigned long type; |
9feedc9d | 109 | static DEFINE_MUTEX(ppb_lock); |
04753278 | 110 | |
5f24ce5f AA |
111 | type = (unsigned long) page->lru.next; |
112 | BUG_ON(type < MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE || | |
113 | type > MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE); | |
04753278 YG |
114 | |
115 | if (atomic_dec_return(&page->_count) == 1) { | |
116 | ClearPagePrivate(page); | |
117 | set_page_private(page, 0); | |
5f24ce5f | 118 | INIT_LIST_HEAD(&page->lru); |
9feedc9d JL |
119 | |
120 | /* | |
121 | * Please refer to comment for __free_pages_bootmem() | |
122 | * for why we serialize here. | |
123 | */ | |
124 | mutex_lock(&ppb_lock); | |
04753278 | 125 | __free_pages_bootmem(page, 0); |
9feedc9d | 126 | mutex_unlock(&ppb_lock); |
c60514b6 | 127 | totalram_pages++; |
04753278 YG |
128 | } |
129 | ||
130 | } | |
131 | ||
46723bfa YI |
132 | #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE |
133 | #ifndef CONFIG_SPARSEMEM_VMEMMAP | |
d92bc318 | 134 | static void register_page_bootmem_info_section(unsigned long start_pfn) |
04753278 YG |
135 | { |
136 | unsigned long *usemap, mapsize, section_nr, i; | |
137 | struct mem_section *ms; | |
138 | struct page *page, *memmap; | |
139 | ||
04753278 YG |
140 | section_nr = pfn_to_section_nr(start_pfn); |
141 | ms = __nr_to_section(section_nr); | |
142 | ||
143 | /* Get section's memmap address */ | |
144 | memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); | |
145 | ||
146 | /* | |
147 | * Get page for the memmap's phys address | |
148 | * XXX: need more consideration for sparse_vmemmap... | |
149 | */ | |
150 | page = virt_to_page(memmap); | |
151 | mapsize = sizeof(struct page) * PAGES_PER_SECTION; | |
152 | mapsize = PAGE_ALIGN(mapsize) >> PAGE_SHIFT; | |
153 | ||
154 | /* remember memmap's page */ | |
155 | for (i = 0; i < mapsize; i++, page++) | |
156 | get_page_bootmem(section_nr, page, SECTION_INFO); | |
157 | ||
158 | usemap = __nr_to_section(section_nr)->pageblock_flags; | |
159 | page = virt_to_page(usemap); | |
160 | ||
161 | mapsize = PAGE_ALIGN(usemap_size()) >> PAGE_SHIFT; | |
162 | ||
163 | for (i = 0; i < mapsize; i++, page++) | |
af370fb8 | 164 | get_page_bootmem(section_nr, page, MIX_SECTION_INFO); |
04753278 YG |
165 | |
166 | } | |
46723bfa YI |
167 | #else /* CONFIG_SPARSEMEM_VMEMMAP */ |
168 | static void register_page_bootmem_info_section(unsigned long start_pfn) | |
169 | { | |
170 | unsigned long *usemap, mapsize, section_nr, i; | |
171 | struct mem_section *ms; | |
172 | struct page *page, *memmap; | |
173 | ||
174 | if (!pfn_valid(start_pfn)) | |
175 | return; | |
176 | ||
177 | section_nr = pfn_to_section_nr(start_pfn); | |
178 | ms = __nr_to_section(section_nr); | |
179 | ||
180 | memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); | |
181 | ||
182 | register_page_bootmem_memmap(section_nr, memmap, PAGES_PER_SECTION); | |
183 | ||
184 | usemap = __nr_to_section(section_nr)->pageblock_flags; | |
185 | page = virt_to_page(usemap); | |
186 | ||
187 | mapsize = PAGE_ALIGN(usemap_size()) >> PAGE_SHIFT; | |
188 | ||
189 | for (i = 0; i < mapsize; i++, page++) | |
190 | get_page_bootmem(section_nr, page, MIX_SECTION_INFO); | |
191 | } | |
192 | #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ | |
04753278 YG |
193 | |
194 | void register_page_bootmem_info_node(struct pglist_data *pgdat) | |
195 | { | |
196 | unsigned long i, pfn, end_pfn, nr_pages; | |
197 | int node = pgdat->node_id; | |
198 | struct page *page; | |
199 | struct zone *zone; | |
200 | ||
201 | nr_pages = PAGE_ALIGN(sizeof(struct pglist_data)) >> PAGE_SHIFT; | |
202 | page = virt_to_page(pgdat); | |
203 | ||
204 | for (i = 0; i < nr_pages; i++, page++) | |
205 | get_page_bootmem(node, page, NODE_INFO); | |
206 | ||
207 | zone = &pgdat->node_zones[0]; | |
208 | for (; zone < pgdat->node_zones + MAX_NR_ZONES - 1; zone++) { | |
209 | if (zone->wait_table) { | |
210 | nr_pages = zone->wait_table_hash_nr_entries | |
211 | * sizeof(wait_queue_head_t); | |
212 | nr_pages = PAGE_ALIGN(nr_pages) >> PAGE_SHIFT; | |
213 | page = virt_to_page(zone->wait_table); | |
214 | ||
215 | for (i = 0; i < nr_pages; i++, page++) | |
216 | get_page_bootmem(node, page, NODE_INFO); | |
217 | } | |
218 | } | |
219 | ||
220 | pfn = pgdat->node_start_pfn; | |
c1f19495 | 221 | end_pfn = pgdat_end_pfn(pgdat); |
04753278 YG |
222 | |
223 | /* register_section info */ | |
f14851af | 224 | for (; pfn < end_pfn; pfn += PAGES_PER_SECTION) { |
225 | /* | |
226 | * Some platforms can assign the same pfn to multiple nodes - on | |
227 | * node0 as well as nodeN. To avoid registering a pfn against | |
228 | * multiple nodes we check that this pfn does not already | |
229 | * reside in some other node. | |
230 | */ | |
231 | if (pfn_valid(pfn) && (pfn_to_nid(pfn) == node)) | |
232 | register_page_bootmem_info_section(pfn); | |
233 | } | |
04753278 | 234 | } |
46723bfa | 235 | #endif /* CONFIG_HAVE_BOOTMEM_INFO_NODE */ |
04753278 | 236 | |
76cdd58e HC |
237 | static void grow_zone_span(struct zone *zone, unsigned long start_pfn, |
238 | unsigned long end_pfn) | |
239 | { | |
240 | unsigned long old_zone_end_pfn; | |
241 | ||
242 | zone_span_writelock(zone); | |
243 | ||
244 | old_zone_end_pfn = zone->zone_start_pfn + zone->spanned_pages; | |
712cd386 | 245 | if (!zone->spanned_pages || start_pfn < zone->zone_start_pfn) |
76cdd58e HC |
246 | zone->zone_start_pfn = start_pfn; |
247 | ||
248 | zone->spanned_pages = max(old_zone_end_pfn, end_pfn) - | |
249 | zone->zone_start_pfn; | |
250 | ||
251 | zone_span_writeunlock(zone); | |
252 | } | |
253 | ||
511c2aba LJ |
254 | static void resize_zone(struct zone *zone, unsigned long start_pfn, |
255 | unsigned long end_pfn) | |
256 | { | |
257 | zone_span_writelock(zone); | |
258 | ||
e455a9b9 LJ |
259 | if (end_pfn - start_pfn) { |
260 | zone->zone_start_pfn = start_pfn; | |
261 | zone->spanned_pages = end_pfn - start_pfn; | |
262 | } else { | |
263 | /* | |
264 | * make it consist as free_area_init_core(), | |
265 | * if spanned_pages = 0, then keep start_pfn = 0 | |
266 | */ | |
267 | zone->zone_start_pfn = 0; | |
268 | zone->spanned_pages = 0; | |
269 | } | |
511c2aba LJ |
270 | |
271 | zone_span_writeunlock(zone); | |
272 | } | |
273 | ||
274 | static void fix_zone_id(struct zone *zone, unsigned long start_pfn, | |
275 | unsigned long end_pfn) | |
276 | { | |
277 | enum zone_type zid = zone_idx(zone); | |
278 | int nid = zone->zone_pgdat->node_id; | |
279 | unsigned long pfn; | |
280 | ||
281 | for (pfn = start_pfn; pfn < end_pfn; pfn++) | |
282 | set_page_links(pfn_to_page(pfn), zid, nid, pfn); | |
283 | } | |
284 | ||
f6bbb78e CS |
285 | /* Can fail with -ENOMEM from allocating a wait table with vmalloc() or |
286 | * alloc_bootmem_node_nopanic() */ | |
287 | static int __ref ensure_zone_is_initialized(struct zone *zone, | |
288 | unsigned long start_pfn, unsigned long num_pages) | |
289 | { | |
290 | if (!zone_is_initialized(zone)) | |
291 | return init_currently_empty_zone(zone, start_pfn, num_pages, | |
292 | MEMMAP_HOTPLUG); | |
293 | return 0; | |
294 | } | |
295 | ||
e455a9b9 | 296 | static int __meminit move_pfn_range_left(struct zone *z1, struct zone *z2, |
511c2aba LJ |
297 | unsigned long start_pfn, unsigned long end_pfn) |
298 | { | |
e455a9b9 | 299 | int ret; |
511c2aba | 300 | unsigned long flags; |
e455a9b9 LJ |
301 | unsigned long z1_start_pfn; |
302 | ||
64dd1b29 CS |
303 | ret = ensure_zone_is_initialized(z1, start_pfn, end_pfn - start_pfn); |
304 | if (ret) | |
305 | return ret; | |
511c2aba LJ |
306 | |
307 | pgdat_resize_lock(z1->zone_pgdat, &flags); | |
308 | ||
309 | /* can't move pfns which are higher than @z2 */ | |
108bcc96 | 310 | if (end_pfn > zone_end_pfn(z2)) |
511c2aba LJ |
311 | goto out_fail; |
312 | /* the move out part mast at the left most of @z2 */ | |
313 | if (start_pfn > z2->zone_start_pfn) | |
314 | goto out_fail; | |
315 | /* must included/overlap */ | |
316 | if (end_pfn <= z2->zone_start_pfn) | |
317 | goto out_fail; | |
318 | ||
e455a9b9 LJ |
319 | /* use start_pfn for z1's start_pfn if z1 is empty */ |
320 | if (z1->spanned_pages) | |
321 | z1_start_pfn = z1->zone_start_pfn; | |
322 | else | |
323 | z1_start_pfn = start_pfn; | |
324 | ||
325 | resize_zone(z1, z1_start_pfn, end_pfn); | |
108bcc96 | 326 | resize_zone(z2, end_pfn, zone_end_pfn(z2)); |
511c2aba LJ |
327 | |
328 | pgdat_resize_unlock(z1->zone_pgdat, &flags); | |
329 | ||
330 | fix_zone_id(z1, start_pfn, end_pfn); | |
331 | ||
332 | return 0; | |
333 | out_fail: | |
334 | pgdat_resize_unlock(z1->zone_pgdat, &flags); | |
335 | return -1; | |
336 | } | |
337 | ||
e455a9b9 | 338 | static int __meminit move_pfn_range_right(struct zone *z1, struct zone *z2, |
511c2aba LJ |
339 | unsigned long start_pfn, unsigned long end_pfn) |
340 | { | |
e455a9b9 | 341 | int ret; |
511c2aba | 342 | unsigned long flags; |
e455a9b9 LJ |
343 | unsigned long z2_end_pfn; |
344 | ||
64dd1b29 CS |
345 | ret = ensure_zone_is_initialized(z2, start_pfn, end_pfn - start_pfn); |
346 | if (ret) | |
347 | return ret; | |
511c2aba LJ |
348 | |
349 | pgdat_resize_lock(z1->zone_pgdat, &flags); | |
350 | ||
351 | /* can't move pfns which are lower than @z1 */ | |
352 | if (z1->zone_start_pfn > start_pfn) | |
353 | goto out_fail; | |
354 | /* the move out part mast at the right most of @z1 */ | |
108bcc96 | 355 | if (zone_end_pfn(z1) > end_pfn) |
511c2aba LJ |
356 | goto out_fail; |
357 | /* must included/overlap */ | |
108bcc96 | 358 | if (start_pfn >= zone_end_pfn(z1)) |
511c2aba LJ |
359 | goto out_fail; |
360 | ||
e455a9b9 LJ |
361 | /* use end_pfn for z2's end_pfn if z2 is empty */ |
362 | if (z2->spanned_pages) | |
108bcc96 | 363 | z2_end_pfn = zone_end_pfn(z2); |
e455a9b9 LJ |
364 | else |
365 | z2_end_pfn = end_pfn; | |
366 | ||
511c2aba | 367 | resize_zone(z1, z1->zone_start_pfn, start_pfn); |
e455a9b9 | 368 | resize_zone(z2, start_pfn, z2_end_pfn); |
511c2aba LJ |
369 | |
370 | pgdat_resize_unlock(z1->zone_pgdat, &flags); | |
371 | ||
372 | fix_zone_id(z2, start_pfn, end_pfn); | |
373 | ||
374 | return 0; | |
375 | out_fail: | |
376 | pgdat_resize_unlock(z1->zone_pgdat, &flags); | |
377 | return -1; | |
378 | } | |
379 | ||
76cdd58e HC |
380 | static void grow_pgdat_span(struct pglist_data *pgdat, unsigned long start_pfn, |
381 | unsigned long end_pfn) | |
382 | { | |
383 | unsigned long old_pgdat_end_pfn = | |
384 | pgdat->node_start_pfn + pgdat->node_spanned_pages; | |
385 | ||
712cd386 | 386 | if (!pgdat->node_spanned_pages || start_pfn < pgdat->node_start_pfn) |
76cdd58e HC |
387 | pgdat->node_start_pfn = start_pfn; |
388 | ||
389 | pgdat->node_spanned_pages = max(old_pgdat_end_pfn, end_pfn) - | |
390 | pgdat->node_start_pfn; | |
391 | } | |
392 | ||
31168481 | 393 | static int __meminit __add_zone(struct zone *zone, unsigned long phys_start_pfn) |
3947be19 DH |
394 | { |
395 | struct pglist_data *pgdat = zone->zone_pgdat; | |
396 | int nr_pages = PAGES_PER_SECTION; | |
397 | int nid = pgdat->node_id; | |
398 | int zone_type; | |
76cdd58e | 399 | unsigned long flags; |
64dd1b29 | 400 | int ret; |
3947be19 DH |
401 | |
402 | zone_type = zone - pgdat->node_zones; | |
64dd1b29 CS |
403 | ret = ensure_zone_is_initialized(zone, phys_start_pfn, nr_pages); |
404 | if (ret) | |
405 | return ret; | |
76cdd58e | 406 | |
76cdd58e HC |
407 | pgdat_resize_lock(zone->zone_pgdat, &flags); |
408 | grow_zone_span(zone, phys_start_pfn, phys_start_pfn + nr_pages); | |
409 | grow_pgdat_span(zone->zone_pgdat, phys_start_pfn, | |
410 | phys_start_pfn + nr_pages); | |
411 | pgdat_resize_unlock(zone->zone_pgdat, &flags); | |
a2f3aa02 DH |
412 | memmap_init_zone(nr_pages, nid, zone_type, |
413 | phys_start_pfn, MEMMAP_HOTPLUG); | |
718127cc | 414 | return 0; |
3947be19 DH |
415 | } |
416 | ||
c04fc586 GH |
417 | static int __meminit __add_section(int nid, struct zone *zone, |
418 | unsigned long phys_start_pfn) | |
3947be19 | 419 | { |
3947be19 | 420 | int nr_pages = PAGES_PER_SECTION; |
3947be19 DH |
421 | int ret; |
422 | ||
ebd15302 KH |
423 | if (pfn_valid(phys_start_pfn)) |
424 | return -EEXIST; | |
425 | ||
0b0acbec | 426 | ret = sparse_add_one_section(zone, phys_start_pfn, nr_pages); |
3947be19 DH |
427 | |
428 | if (ret < 0) | |
429 | return ret; | |
430 | ||
718127cc YG |
431 | ret = __add_zone(zone, phys_start_pfn); |
432 | ||
433 | if (ret < 0) | |
434 | return ret; | |
435 | ||
c04fc586 | 436 | return register_new_memory(nid, __pfn_to_section(phys_start_pfn)); |
3947be19 DH |
437 | } |
438 | ||
815121d2 YI |
439 | /* find the smallest valid pfn in the range [start_pfn, end_pfn) */ |
440 | static int find_smallest_section_pfn(int nid, struct zone *zone, | |
441 | unsigned long start_pfn, | |
442 | unsigned long end_pfn) | |
443 | { | |
444 | struct mem_section *ms; | |
445 | ||
446 | for (; start_pfn < end_pfn; start_pfn += PAGES_PER_SECTION) { | |
447 | ms = __pfn_to_section(start_pfn); | |
448 | ||
449 | if (unlikely(!valid_section(ms))) | |
450 | continue; | |
451 | ||
452 | if (unlikely(pfn_to_nid(start_pfn) != nid)) | |
453 | continue; | |
454 | ||
455 | if (zone && zone != page_zone(pfn_to_page(start_pfn))) | |
456 | continue; | |
457 | ||
458 | return start_pfn; | |
459 | } | |
460 | ||
461 | return 0; | |
462 | } | |
463 | ||
464 | /* find the biggest valid pfn in the range [start_pfn, end_pfn). */ | |
465 | static int find_biggest_section_pfn(int nid, struct zone *zone, | |
466 | unsigned long start_pfn, | |
467 | unsigned long end_pfn) | |
468 | { | |
469 | struct mem_section *ms; | |
470 | unsigned long pfn; | |
471 | ||
472 | /* pfn is the end pfn of a memory section. */ | |
473 | pfn = end_pfn - 1; | |
474 | for (; pfn >= start_pfn; pfn -= PAGES_PER_SECTION) { | |
475 | ms = __pfn_to_section(pfn); | |
476 | ||
477 | if (unlikely(!valid_section(ms))) | |
478 | continue; | |
479 | ||
480 | if (unlikely(pfn_to_nid(pfn) != nid)) | |
481 | continue; | |
482 | ||
483 | if (zone && zone != page_zone(pfn_to_page(pfn))) | |
484 | continue; | |
485 | ||
486 | return pfn; | |
487 | } | |
488 | ||
489 | return 0; | |
490 | } | |
491 | ||
492 | static void shrink_zone_span(struct zone *zone, unsigned long start_pfn, | |
493 | unsigned long end_pfn) | |
494 | { | |
495 | unsigned long zone_start_pfn = zone->zone_start_pfn; | |
496 | unsigned long zone_end_pfn = zone->zone_start_pfn + zone->spanned_pages; | |
497 | unsigned long pfn; | |
498 | struct mem_section *ms; | |
499 | int nid = zone_to_nid(zone); | |
500 | ||
501 | zone_span_writelock(zone); | |
502 | if (zone_start_pfn == start_pfn) { | |
503 | /* | |
504 | * If the section is smallest section in the zone, it need | |
505 | * shrink zone->zone_start_pfn and zone->zone_spanned_pages. | |
506 | * In this case, we find second smallest valid mem_section | |
507 | * for shrinking zone. | |
508 | */ | |
509 | pfn = find_smallest_section_pfn(nid, zone, end_pfn, | |
510 | zone_end_pfn); | |
511 | if (pfn) { | |
512 | zone->zone_start_pfn = pfn; | |
513 | zone->spanned_pages = zone_end_pfn - pfn; | |
514 | } | |
515 | } else if (zone_end_pfn == end_pfn) { | |
516 | /* | |
517 | * If the section is biggest section in the zone, it need | |
518 | * shrink zone->spanned_pages. | |
519 | * In this case, we find second biggest valid mem_section for | |
520 | * shrinking zone. | |
521 | */ | |
522 | pfn = find_biggest_section_pfn(nid, zone, zone_start_pfn, | |
523 | start_pfn); | |
524 | if (pfn) | |
525 | zone->spanned_pages = pfn - zone_start_pfn + 1; | |
526 | } | |
527 | ||
528 | /* | |
529 | * The section is not biggest or smallest mem_section in the zone, it | |
530 | * only creates a hole in the zone. So in this case, we need not | |
531 | * change the zone. But perhaps, the zone has only hole data. Thus | |
532 | * it check the zone has only hole or not. | |
533 | */ | |
534 | pfn = zone_start_pfn; | |
535 | for (; pfn < zone_end_pfn; pfn += PAGES_PER_SECTION) { | |
536 | ms = __pfn_to_section(pfn); | |
537 | ||
538 | if (unlikely(!valid_section(ms))) | |
539 | continue; | |
540 | ||
541 | if (page_zone(pfn_to_page(pfn)) != zone) | |
542 | continue; | |
543 | ||
544 | /* If the section is current section, it continues the loop */ | |
545 | if (start_pfn == pfn) | |
546 | continue; | |
547 | ||
548 | /* If we find valid section, we have nothing to do */ | |
549 | zone_span_writeunlock(zone); | |
550 | return; | |
551 | } | |
552 | ||
553 | /* The zone has no valid section */ | |
554 | zone->zone_start_pfn = 0; | |
555 | zone->spanned_pages = 0; | |
556 | zone_span_writeunlock(zone); | |
557 | } | |
558 | ||
559 | static void shrink_pgdat_span(struct pglist_data *pgdat, | |
560 | unsigned long start_pfn, unsigned long end_pfn) | |
561 | { | |
562 | unsigned long pgdat_start_pfn = pgdat->node_start_pfn; | |
563 | unsigned long pgdat_end_pfn = | |
564 | pgdat->node_start_pfn + pgdat->node_spanned_pages; | |
565 | unsigned long pfn; | |
566 | struct mem_section *ms; | |
567 | int nid = pgdat->node_id; | |
568 | ||
569 | if (pgdat_start_pfn == start_pfn) { | |
570 | /* | |
571 | * If the section is smallest section in the pgdat, it need | |
572 | * shrink pgdat->node_start_pfn and pgdat->node_spanned_pages. | |
573 | * In this case, we find second smallest valid mem_section | |
574 | * for shrinking zone. | |
575 | */ | |
576 | pfn = find_smallest_section_pfn(nid, NULL, end_pfn, | |
577 | pgdat_end_pfn); | |
578 | if (pfn) { | |
579 | pgdat->node_start_pfn = pfn; | |
580 | pgdat->node_spanned_pages = pgdat_end_pfn - pfn; | |
581 | } | |
582 | } else if (pgdat_end_pfn == end_pfn) { | |
583 | /* | |
584 | * If the section is biggest section in the pgdat, it need | |
585 | * shrink pgdat->node_spanned_pages. | |
586 | * In this case, we find second biggest valid mem_section for | |
587 | * shrinking zone. | |
588 | */ | |
589 | pfn = find_biggest_section_pfn(nid, NULL, pgdat_start_pfn, | |
590 | start_pfn); | |
591 | if (pfn) | |
592 | pgdat->node_spanned_pages = pfn - pgdat_start_pfn + 1; | |
593 | } | |
594 | ||
595 | /* | |
596 | * If the section is not biggest or smallest mem_section in the pgdat, | |
597 | * it only creates a hole in the pgdat. So in this case, we need not | |
598 | * change the pgdat. | |
599 | * But perhaps, the pgdat has only hole data. Thus it check the pgdat | |
600 | * has only hole or not. | |
601 | */ | |
602 | pfn = pgdat_start_pfn; | |
603 | for (; pfn < pgdat_end_pfn; pfn += PAGES_PER_SECTION) { | |
604 | ms = __pfn_to_section(pfn); | |
605 | ||
606 | if (unlikely(!valid_section(ms))) | |
607 | continue; | |
608 | ||
609 | if (pfn_to_nid(pfn) != nid) | |
610 | continue; | |
611 | ||
612 | /* If the section is current section, it continues the loop */ | |
613 | if (start_pfn == pfn) | |
614 | continue; | |
615 | ||
616 | /* If we find valid section, we have nothing to do */ | |
617 | return; | |
618 | } | |
619 | ||
620 | /* The pgdat has no valid section */ | |
621 | pgdat->node_start_pfn = 0; | |
622 | pgdat->node_spanned_pages = 0; | |
623 | } | |
624 | ||
625 | static void __remove_zone(struct zone *zone, unsigned long start_pfn) | |
626 | { | |
627 | struct pglist_data *pgdat = zone->zone_pgdat; | |
628 | int nr_pages = PAGES_PER_SECTION; | |
629 | int zone_type; | |
630 | unsigned long flags; | |
631 | ||
632 | zone_type = zone - pgdat->node_zones; | |
633 | ||
634 | pgdat_resize_lock(zone->zone_pgdat, &flags); | |
635 | shrink_zone_span(zone, start_pfn, start_pfn + nr_pages); | |
636 | shrink_pgdat_span(pgdat, start_pfn, start_pfn + nr_pages); | |
637 | pgdat_resize_unlock(zone->zone_pgdat, &flags); | |
638 | } | |
639 | ||
ea01ea93 BP |
640 | static int __remove_section(struct zone *zone, struct mem_section *ms) |
641 | { | |
815121d2 YI |
642 | unsigned long start_pfn; |
643 | int scn_nr; | |
ea01ea93 BP |
644 | int ret = -EINVAL; |
645 | ||
646 | if (!valid_section(ms)) | |
647 | return ret; | |
648 | ||
649 | ret = unregister_memory_section(ms); | |
650 | if (ret) | |
651 | return ret; | |
652 | ||
815121d2 YI |
653 | scn_nr = __section_nr(ms); |
654 | start_pfn = section_nr_to_pfn(scn_nr); | |
655 | __remove_zone(zone, start_pfn); | |
656 | ||
ea01ea93 | 657 | sparse_remove_one_section(zone, ms); |
ea01ea93 BP |
658 | return 0; |
659 | } | |
660 | ||
3947be19 DH |
661 | /* |
662 | * Reasonably generic function for adding memory. It is | |
663 | * expected that archs that support memory hotplug will | |
664 | * call this function after deciding the zone to which to | |
665 | * add the new pages. | |
666 | */ | |
c04fc586 GH |
667 | int __ref __add_pages(int nid, struct zone *zone, unsigned long phys_start_pfn, |
668 | unsigned long nr_pages) | |
3947be19 DH |
669 | { |
670 | unsigned long i; | |
671 | int err = 0; | |
6f712711 KH |
672 | int start_sec, end_sec; |
673 | /* during initialize mem_map, align hot-added range to section */ | |
674 | start_sec = pfn_to_section_nr(phys_start_pfn); | |
675 | end_sec = pfn_to_section_nr(phys_start_pfn + nr_pages - 1); | |
3947be19 | 676 | |
6f712711 | 677 | for (i = start_sec; i <= end_sec; i++) { |
c04fc586 | 678 | err = __add_section(nid, zone, i << PFN_SECTION_SHIFT); |
3947be19 | 679 | |
6f712711 | 680 | /* |
183ff22b | 681 | * EEXIST is finally dealt with by ioresource collision |
6f712711 KH |
682 | * check. see add_memory() => register_memory_resource() |
683 | * Warning will be printed if there is collision. | |
bed120c6 JS |
684 | */ |
685 | if (err && (err != -EEXIST)) | |
3947be19 | 686 | break; |
6f712711 | 687 | err = 0; |
3947be19 DH |
688 | } |
689 | ||
690 | return err; | |
691 | } | |
bed120c6 | 692 | EXPORT_SYMBOL_GPL(__add_pages); |
3947be19 | 693 | |
ea01ea93 BP |
694 | /** |
695 | * __remove_pages() - remove sections of pages from a zone | |
696 | * @zone: zone from which pages need to be removed | |
697 | * @phys_start_pfn: starting pageframe (must be aligned to start of a section) | |
698 | * @nr_pages: number of pages to remove (must be multiple of section size) | |
699 | * | |
700 | * Generic helper function to remove section mappings and sysfs entries | |
701 | * for the section of the memory we are removing. Caller needs to make | |
702 | * sure that pages are marked reserved and zones are adjust properly by | |
703 | * calling offline_pages(). | |
704 | */ | |
705 | int __remove_pages(struct zone *zone, unsigned long phys_start_pfn, | |
706 | unsigned long nr_pages) | |
707 | { | |
708 | unsigned long i, ret = 0; | |
709 | int sections_to_remove; | |
710 | ||
711 | /* | |
712 | * We can only remove entire sections | |
713 | */ | |
714 | BUG_ON(phys_start_pfn & ~PAGE_SECTION_MASK); | |
715 | BUG_ON(nr_pages % PAGES_PER_SECTION); | |
716 | ||
d760afd4 YI |
717 | release_mem_region(phys_start_pfn << PAGE_SHIFT, nr_pages * PAGE_SIZE); |
718 | ||
ea01ea93 BP |
719 | sections_to_remove = nr_pages / PAGES_PER_SECTION; |
720 | for (i = 0; i < sections_to_remove; i++) { | |
721 | unsigned long pfn = phys_start_pfn + i*PAGES_PER_SECTION; | |
722 | ret = __remove_section(zone, __pfn_to_section(pfn)); | |
723 | if (ret) | |
724 | break; | |
725 | } | |
726 | return ret; | |
727 | } | |
728 | EXPORT_SYMBOL_GPL(__remove_pages); | |
729 | ||
9d0ad8ca DK |
730 | int set_online_page_callback(online_page_callback_t callback) |
731 | { | |
732 | int rc = -EINVAL; | |
733 | ||
734 | lock_memory_hotplug(); | |
735 | ||
736 | if (online_page_callback == generic_online_page) { | |
737 | online_page_callback = callback; | |
738 | rc = 0; | |
739 | } | |
740 | ||
741 | unlock_memory_hotplug(); | |
742 | ||
743 | return rc; | |
744 | } | |
745 | EXPORT_SYMBOL_GPL(set_online_page_callback); | |
746 | ||
747 | int restore_online_page_callback(online_page_callback_t callback) | |
748 | { | |
749 | int rc = -EINVAL; | |
750 | ||
751 | lock_memory_hotplug(); | |
752 | ||
753 | if (online_page_callback == callback) { | |
754 | online_page_callback = generic_online_page; | |
755 | rc = 0; | |
756 | } | |
757 | ||
758 | unlock_memory_hotplug(); | |
759 | ||
760 | return rc; | |
761 | } | |
762 | EXPORT_SYMBOL_GPL(restore_online_page_callback); | |
763 | ||
764 | void __online_page_set_limits(struct page *page) | |
180c06ef | 765 | { |
4738e1b9 JB |
766 | unsigned long pfn = page_to_pfn(page); |
767 | ||
4738e1b9 JB |
768 | if (pfn >= num_physpages) |
769 | num_physpages = pfn + 1; | |
9d0ad8ca DK |
770 | } |
771 | EXPORT_SYMBOL_GPL(__online_page_set_limits); | |
772 | ||
773 | void __online_page_increment_counters(struct page *page) | |
774 | { | |
775 | totalram_pages++; | |
180c06ef JF |
776 | |
777 | #ifdef CONFIG_HIGHMEM | |
778 | if (PageHighMem(page)) | |
779 | totalhigh_pages++; | |
780 | #endif | |
9d0ad8ca DK |
781 | } |
782 | EXPORT_SYMBOL_GPL(__online_page_increment_counters); | |
180c06ef | 783 | |
9d0ad8ca DK |
784 | void __online_page_free(struct page *page) |
785 | { | |
180c06ef JF |
786 | ClearPageReserved(page); |
787 | init_page_count(page); | |
788 | __free_page(page); | |
789 | } | |
9d0ad8ca DK |
790 | EXPORT_SYMBOL_GPL(__online_page_free); |
791 | ||
792 | static void generic_online_page(struct page *page) | |
793 | { | |
794 | __online_page_set_limits(page); | |
795 | __online_page_increment_counters(page); | |
796 | __online_page_free(page); | |
797 | } | |
180c06ef | 798 | |
75884fb1 KH |
799 | static int online_pages_range(unsigned long start_pfn, unsigned long nr_pages, |
800 | void *arg) | |
3947be19 DH |
801 | { |
802 | unsigned long i; | |
75884fb1 KH |
803 | unsigned long onlined_pages = *(unsigned long *)arg; |
804 | struct page *page; | |
805 | if (PageReserved(pfn_to_page(start_pfn))) | |
806 | for (i = 0; i < nr_pages; i++) { | |
807 | page = pfn_to_page(start_pfn + i); | |
9d0ad8ca | 808 | (*online_page_callback)(page); |
75884fb1 KH |
809 | onlined_pages++; |
810 | } | |
811 | *(unsigned long *)arg = onlined_pages; | |
812 | return 0; | |
813 | } | |
814 | ||
09285af7 | 815 | #ifdef CONFIG_MOVABLE_NODE |
79a4dcef TC |
816 | /* |
817 | * When CONFIG_MOVABLE_NODE, we permit onlining of a node which doesn't have | |
818 | * normal memory. | |
819 | */ | |
09285af7 LJ |
820 | static bool can_online_high_movable(struct zone *zone) |
821 | { | |
822 | return true; | |
823 | } | |
79a4dcef | 824 | #else /* CONFIG_MOVABLE_NODE */ |
74d42d8f LJ |
825 | /* ensure every online node has NORMAL memory */ |
826 | static bool can_online_high_movable(struct zone *zone) | |
827 | { | |
828 | return node_state(zone_to_nid(zone), N_NORMAL_MEMORY); | |
829 | } | |
79a4dcef | 830 | #endif /* CONFIG_MOVABLE_NODE */ |
74d42d8f | 831 | |
d9713679 LJ |
832 | /* check which state of node_states will be changed when online memory */ |
833 | static void node_states_check_changes_online(unsigned long nr_pages, | |
834 | struct zone *zone, struct memory_notify *arg) | |
835 | { | |
836 | int nid = zone_to_nid(zone); | |
837 | enum zone_type zone_last = ZONE_NORMAL; | |
838 | ||
839 | /* | |
6715ddf9 LJ |
840 | * If we have HIGHMEM or movable node, node_states[N_NORMAL_MEMORY] |
841 | * contains nodes which have zones of 0...ZONE_NORMAL, | |
842 | * set zone_last to ZONE_NORMAL. | |
d9713679 | 843 | * |
6715ddf9 LJ |
844 | * If we don't have HIGHMEM nor movable node, |
845 | * node_states[N_NORMAL_MEMORY] contains nodes which have zones of | |
846 | * 0...ZONE_MOVABLE, set zone_last to ZONE_MOVABLE. | |
d9713679 | 847 | */ |
6715ddf9 | 848 | if (N_MEMORY == N_NORMAL_MEMORY) |
d9713679 LJ |
849 | zone_last = ZONE_MOVABLE; |
850 | ||
851 | /* | |
852 | * if the memory to be online is in a zone of 0...zone_last, and | |
853 | * the zones of 0...zone_last don't have memory before online, we will | |
854 | * need to set the node to node_states[N_NORMAL_MEMORY] after | |
855 | * the memory is online. | |
856 | */ | |
857 | if (zone_idx(zone) <= zone_last && !node_state(nid, N_NORMAL_MEMORY)) | |
858 | arg->status_change_nid_normal = nid; | |
859 | else | |
860 | arg->status_change_nid_normal = -1; | |
861 | ||
6715ddf9 LJ |
862 | #ifdef CONFIG_HIGHMEM |
863 | /* | |
864 | * If we have movable node, node_states[N_HIGH_MEMORY] | |
865 | * contains nodes which have zones of 0...ZONE_HIGHMEM, | |
866 | * set zone_last to ZONE_HIGHMEM. | |
867 | * | |
868 | * If we don't have movable node, node_states[N_NORMAL_MEMORY] | |
869 | * contains nodes which have zones of 0...ZONE_MOVABLE, | |
870 | * set zone_last to ZONE_MOVABLE. | |
871 | */ | |
872 | zone_last = ZONE_HIGHMEM; | |
873 | if (N_MEMORY == N_HIGH_MEMORY) | |
874 | zone_last = ZONE_MOVABLE; | |
875 | ||
876 | if (zone_idx(zone) <= zone_last && !node_state(nid, N_HIGH_MEMORY)) | |
877 | arg->status_change_nid_high = nid; | |
878 | else | |
879 | arg->status_change_nid_high = -1; | |
880 | #else | |
881 | arg->status_change_nid_high = arg->status_change_nid_normal; | |
882 | #endif | |
883 | ||
d9713679 LJ |
884 | /* |
885 | * if the node don't have memory befor online, we will need to | |
6715ddf9 | 886 | * set the node to node_states[N_MEMORY] after the memory |
d9713679 LJ |
887 | * is online. |
888 | */ | |
6715ddf9 | 889 | if (!node_state(nid, N_MEMORY)) |
d9713679 LJ |
890 | arg->status_change_nid = nid; |
891 | else | |
892 | arg->status_change_nid = -1; | |
893 | } | |
894 | ||
895 | static void node_states_set_node(int node, struct memory_notify *arg) | |
896 | { | |
897 | if (arg->status_change_nid_normal >= 0) | |
898 | node_set_state(node, N_NORMAL_MEMORY); | |
899 | ||
6715ddf9 LJ |
900 | if (arg->status_change_nid_high >= 0) |
901 | node_set_state(node, N_HIGH_MEMORY); | |
902 | ||
903 | node_set_state(node, N_MEMORY); | |
d9713679 LJ |
904 | } |
905 | ||
75884fb1 | 906 | |
511c2aba | 907 | int __ref online_pages(unsigned long pfn, unsigned long nr_pages, int online_type) |
75884fb1 | 908 | { |
3947be19 DH |
909 | unsigned long onlined_pages = 0; |
910 | struct zone *zone; | |
6811378e | 911 | int need_zonelists_rebuild = 0; |
7b78d335 YG |
912 | int nid; |
913 | int ret; | |
914 | struct memory_notify arg; | |
915 | ||
925268a0 | 916 | lock_memory_hotplug(); |
d9713679 LJ |
917 | /* |
918 | * This doesn't need a lock to do pfn_to_page(). | |
919 | * The section can't be removed here because of the | |
920 | * memory_block->state_mutex. | |
921 | */ | |
922 | zone = page_zone(pfn_to_page(pfn)); | |
923 | ||
74d42d8f LJ |
924 | if ((zone_idx(zone) > ZONE_NORMAL || online_type == ONLINE_MOVABLE) && |
925 | !can_online_high_movable(zone)) { | |
926 | unlock_memory_hotplug(); | |
927 | return -1; | |
928 | } | |
929 | ||
511c2aba LJ |
930 | if (online_type == ONLINE_KERNEL && zone_idx(zone) == ZONE_MOVABLE) { |
931 | if (move_pfn_range_left(zone - 1, zone, pfn, pfn + nr_pages)) { | |
932 | unlock_memory_hotplug(); | |
933 | return -1; | |
934 | } | |
935 | } | |
936 | if (online_type == ONLINE_MOVABLE && zone_idx(zone) == ZONE_MOVABLE - 1) { | |
937 | if (move_pfn_range_right(zone, zone + 1, pfn, pfn + nr_pages)) { | |
938 | unlock_memory_hotplug(); | |
939 | return -1; | |
940 | } | |
941 | } | |
942 | ||
943 | /* Previous code may changed the zone of the pfn range */ | |
944 | zone = page_zone(pfn_to_page(pfn)); | |
945 | ||
7b78d335 YG |
946 | arg.start_pfn = pfn; |
947 | arg.nr_pages = nr_pages; | |
d9713679 | 948 | node_states_check_changes_online(nr_pages, zone, &arg); |
7b78d335 YG |
949 | |
950 | nid = page_to_nid(pfn_to_page(pfn)); | |
3947be19 | 951 | |
7b78d335 YG |
952 | ret = memory_notify(MEM_GOING_ONLINE, &arg); |
953 | ret = notifier_to_errno(ret); | |
954 | if (ret) { | |
955 | memory_notify(MEM_CANCEL_ONLINE, &arg); | |
925268a0 | 956 | unlock_memory_hotplug(); |
7b78d335 YG |
957 | return ret; |
958 | } | |
6811378e YG |
959 | /* |
960 | * If this zone is not populated, then it is not in zonelist. | |
961 | * This means the page allocator ignores this zone. | |
962 | * So, zonelist must be updated after online. | |
963 | */ | |
4eaf3f64 | 964 | mutex_lock(&zonelists_mutex); |
6dcd73d7 | 965 | if (!populated_zone(zone)) { |
6811378e | 966 | need_zonelists_rebuild = 1; |
6dcd73d7 WC |
967 | build_all_zonelists(NULL, zone); |
968 | } | |
6811378e | 969 | |
908eedc6 | 970 | ret = walk_system_ram_range(pfn, nr_pages, &onlined_pages, |
75884fb1 | 971 | online_pages_range); |
fd8a4221 | 972 | if (ret) { |
6dcd73d7 WC |
973 | if (need_zonelists_rebuild) |
974 | zone_pcp_reset(zone); | |
4eaf3f64 | 975 | mutex_unlock(&zonelists_mutex); |
a62e2f4f BH |
976 | printk(KERN_DEBUG "online_pages [mem %#010llx-%#010llx] failed\n", |
977 | (unsigned long long) pfn << PAGE_SHIFT, | |
978 | (((unsigned long long) pfn + nr_pages) | |
979 | << PAGE_SHIFT) - 1); | |
fd8a4221 | 980 | memory_notify(MEM_CANCEL_ONLINE, &arg); |
925268a0 | 981 | unlock_memory_hotplug(); |
fd8a4221 GL |
982 | return ret; |
983 | } | |
984 | ||
9feedc9d | 985 | zone->managed_pages += onlined_pages; |
3947be19 | 986 | zone->present_pages += onlined_pages; |
f2937be5 | 987 | zone->zone_pgdat->node_present_pages += onlined_pages; |
08dff7b7 | 988 | if (onlined_pages) { |
d9713679 | 989 | node_states_set_node(zone_to_nid(zone), &arg); |
08dff7b7 | 990 | if (need_zonelists_rebuild) |
6dcd73d7 | 991 | build_all_zonelists(NULL, NULL); |
08dff7b7 JL |
992 | else |
993 | zone_pcp_update(zone); | |
994 | } | |
3947be19 | 995 | |
4eaf3f64 | 996 | mutex_unlock(&zonelists_mutex); |
1b79acc9 KM |
997 | |
998 | init_per_zone_wmark_min(); | |
999 | ||
08dff7b7 | 1000 | if (onlined_pages) |
7ea1530a | 1001 | kswapd_run(zone_to_nid(zone)); |
61b13993 | 1002 | |
1f522509 | 1003 | vm_total_pages = nr_free_pagecache_pages(); |
2f7f24ec | 1004 | |
2d1d43f6 | 1005 | writeback_set_ratelimit(); |
7b78d335 YG |
1006 | |
1007 | if (onlined_pages) | |
1008 | memory_notify(MEM_ONLINE, &arg); | |
925268a0 | 1009 | unlock_memory_hotplug(); |
7b78d335 | 1010 | |
3947be19 DH |
1011 | return 0; |
1012 | } | |
53947027 | 1013 | #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ |
bc02af93 | 1014 | |
e1319331 HS |
1015 | /* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */ |
1016 | static pg_data_t __ref *hotadd_new_pgdat(int nid, u64 start) | |
9af3c2de YG |
1017 | { |
1018 | struct pglist_data *pgdat; | |
1019 | unsigned long zones_size[MAX_NR_ZONES] = {0}; | |
1020 | unsigned long zholes_size[MAX_NR_ZONES] = {0}; | |
1021 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
1022 | ||
a1e565aa TC |
1023 | pgdat = NODE_DATA(nid); |
1024 | if (!pgdat) { | |
1025 | pgdat = arch_alloc_nodedata(nid); | |
1026 | if (!pgdat) | |
1027 | return NULL; | |
9af3c2de | 1028 | |
a1e565aa TC |
1029 | arch_refresh_nodedata(nid, pgdat); |
1030 | } | |
9af3c2de YG |
1031 | |
1032 | /* we can use NODE_DATA(nid) from here */ | |
1033 | ||
1034 | /* init node's zones as empty zones, we don't have any present pages.*/ | |
9109fb7b | 1035 | free_area_init_node(nid, zones_size, start_pfn, zholes_size); |
9af3c2de | 1036 | |
959ecc48 KH |
1037 | /* |
1038 | * The node we allocated has no zone fallback lists. For avoiding | |
1039 | * to access not-initialized zonelist, build here. | |
1040 | */ | |
f957db4f | 1041 | mutex_lock(&zonelists_mutex); |
9adb62a5 | 1042 | build_all_zonelists(pgdat, NULL); |
f957db4f | 1043 | mutex_unlock(&zonelists_mutex); |
959ecc48 | 1044 | |
9af3c2de YG |
1045 | return pgdat; |
1046 | } | |
1047 | ||
1048 | static void rollback_node_hotadd(int nid, pg_data_t *pgdat) | |
1049 | { | |
1050 | arch_refresh_nodedata(nid, NULL); | |
1051 | arch_free_nodedata(pgdat); | |
1052 | return; | |
1053 | } | |
1054 | ||
0a547039 | 1055 | |
cf23422b | 1056 | /* |
1057 | * called by cpu_up() to online a node without onlined memory. | |
1058 | */ | |
1059 | int mem_online_node(int nid) | |
1060 | { | |
1061 | pg_data_t *pgdat; | |
1062 | int ret; | |
1063 | ||
20d6c96b | 1064 | lock_memory_hotplug(); |
cf23422b | 1065 | pgdat = hotadd_new_pgdat(nid, 0); |
7553e8f2 | 1066 | if (!pgdat) { |
cf23422b | 1067 | ret = -ENOMEM; |
1068 | goto out; | |
1069 | } | |
1070 | node_set_online(nid); | |
1071 | ret = register_one_node(nid); | |
1072 | BUG_ON(ret); | |
1073 | ||
1074 | out: | |
20d6c96b | 1075 | unlock_memory_hotplug(); |
cf23422b | 1076 | return ret; |
1077 | } | |
1078 | ||
31168481 AV |
1079 | /* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */ |
1080 | int __ref add_memory(int nid, u64 start, u64 size) | |
bc02af93 | 1081 | { |
9af3c2de | 1082 | pg_data_t *pgdat = NULL; |
a1e565aa TC |
1083 | bool new_pgdat; |
1084 | bool new_node; | |
ebd15302 | 1085 | struct resource *res; |
bc02af93 YG |
1086 | int ret; |
1087 | ||
20d6c96b | 1088 | lock_memory_hotplug(); |
6ad696d2 | 1089 | |
ebd15302 | 1090 | res = register_memory_resource(start, size); |
6ad696d2 | 1091 | ret = -EEXIST; |
ebd15302 | 1092 | if (!res) |
6ad696d2 | 1093 | goto out; |
ebd15302 | 1094 | |
a1e565aa TC |
1095 | { /* Stupid hack to suppress address-never-null warning */ |
1096 | void *p = NODE_DATA(nid); | |
1097 | new_pgdat = !p; | |
1098 | } | |
1099 | new_node = !node_online(nid); | |
1100 | if (new_node) { | |
9af3c2de | 1101 | pgdat = hotadd_new_pgdat(nid, start); |
6ad696d2 | 1102 | ret = -ENOMEM; |
9af3c2de | 1103 | if (!pgdat) |
41b9e2d7 | 1104 | goto error; |
9af3c2de YG |
1105 | } |
1106 | ||
bc02af93 YG |
1107 | /* call arch's memory hotadd */ |
1108 | ret = arch_add_memory(nid, start, size); | |
1109 | ||
9af3c2de YG |
1110 | if (ret < 0) |
1111 | goto error; | |
1112 | ||
0fc44159 | 1113 | /* we online node here. we can't roll back from here. */ |
9af3c2de YG |
1114 | node_set_online(nid); |
1115 | ||
a1e565aa | 1116 | if (new_node) { |
0fc44159 YG |
1117 | ret = register_one_node(nid); |
1118 | /* | |
1119 | * If sysfs file of new node can't create, cpu on the node | |
1120 | * can't be hot-added. There is no rollback way now. | |
1121 | * So, check by BUG_ON() to catch it reluctantly.. | |
1122 | */ | |
1123 | BUG_ON(ret); | |
1124 | } | |
1125 | ||
d96ae530 AM |
1126 | /* create new memmap entry */ |
1127 | firmware_map_add_hotplug(start, start + size, "System RAM"); | |
1128 | ||
6ad696d2 AK |
1129 | goto out; |
1130 | ||
9af3c2de YG |
1131 | error: |
1132 | /* rollback pgdat allocation and others */ | |
1133 | if (new_pgdat) | |
1134 | rollback_node_hotadd(nid, pgdat); | |
a864b9d0 | 1135 | release_memory_resource(res); |
9af3c2de | 1136 | |
6ad696d2 | 1137 | out: |
20d6c96b | 1138 | unlock_memory_hotplug(); |
bc02af93 YG |
1139 | return ret; |
1140 | } | |
1141 | EXPORT_SYMBOL_GPL(add_memory); | |
0c0e6195 KH |
1142 | |
1143 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
5c755e9f BP |
1144 | /* |
1145 | * A free page on the buddy free lists (not the per-cpu lists) has PageBuddy | |
1146 | * set and the size of the free page is given by page_order(). Using this, | |
1147 | * the function determines if the pageblock contains only free pages. | |
1148 | * Due to buddy contraints, a free page at least the size of a pageblock will | |
1149 | * be located at the start of the pageblock | |
1150 | */ | |
1151 | static inline int pageblock_free(struct page *page) | |
1152 | { | |
1153 | return PageBuddy(page) && page_order(page) >= pageblock_order; | |
1154 | } | |
1155 | ||
1156 | /* Return the start of the next active pageblock after a given page */ | |
1157 | static struct page *next_active_pageblock(struct page *page) | |
1158 | { | |
5c755e9f BP |
1159 | /* Ensure the starting page is pageblock-aligned */ |
1160 | BUG_ON(page_to_pfn(page) & (pageblock_nr_pages - 1)); | |
1161 | ||
5c755e9f | 1162 | /* If the entire pageblock is free, move to the end of free page */ |
0dcc48c1 KH |
1163 | if (pageblock_free(page)) { |
1164 | int order; | |
1165 | /* be careful. we don't have locks, page_order can be changed.*/ | |
1166 | order = page_order(page); | |
1167 | if ((order < MAX_ORDER) && (order >= pageblock_order)) | |
1168 | return page + (1 << order); | |
1169 | } | |
5c755e9f | 1170 | |
0dcc48c1 | 1171 | return page + pageblock_nr_pages; |
5c755e9f BP |
1172 | } |
1173 | ||
1174 | /* Checks if this range of memory is likely to be hot-removable. */ | |
1175 | int is_mem_section_removable(unsigned long start_pfn, unsigned long nr_pages) | |
1176 | { | |
5c755e9f BP |
1177 | struct page *page = pfn_to_page(start_pfn); |
1178 | struct page *end_page = page + nr_pages; | |
1179 | ||
1180 | /* Check the starting page of each pageblock within the range */ | |
1181 | for (; page < end_page; page = next_active_pageblock(page)) { | |
49ac8255 | 1182 | if (!is_pageblock_removable_nolock(page)) |
5c755e9f | 1183 | return 0; |
49ac8255 | 1184 | cond_resched(); |
5c755e9f BP |
1185 | } |
1186 | ||
1187 | /* All pageblocks in the memory block are likely to be hot-removable */ | |
1188 | return 1; | |
1189 | } | |
1190 | ||
0c0e6195 KH |
1191 | /* |
1192 | * Confirm all pages in a range [start, end) is belongs to the same zone. | |
1193 | */ | |
1194 | static int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn) | |
1195 | { | |
1196 | unsigned long pfn; | |
1197 | struct zone *zone = NULL; | |
1198 | struct page *page; | |
1199 | int i; | |
1200 | for (pfn = start_pfn; | |
1201 | pfn < end_pfn; | |
1202 | pfn += MAX_ORDER_NR_PAGES) { | |
1203 | i = 0; | |
1204 | /* This is just a CONFIG_HOLES_IN_ZONE check.*/ | |
1205 | while ((i < MAX_ORDER_NR_PAGES) && !pfn_valid_within(pfn + i)) | |
1206 | i++; | |
1207 | if (i == MAX_ORDER_NR_PAGES) | |
1208 | continue; | |
1209 | page = pfn_to_page(pfn + i); | |
1210 | if (zone && page_zone(page) != zone) | |
1211 | return 0; | |
1212 | zone = page_zone(page); | |
1213 | } | |
1214 | return 1; | |
1215 | } | |
1216 | ||
1217 | /* | |
1218 | * Scanning pfn is much easier than scanning lru list. | |
1219 | * Scan pfn from start to end and Find LRU page. | |
1220 | */ | |
7bbc0905 | 1221 | static unsigned long scan_lru_pages(unsigned long start, unsigned long end) |
0c0e6195 KH |
1222 | { |
1223 | unsigned long pfn; | |
1224 | struct page *page; | |
1225 | for (pfn = start; pfn < end; pfn++) { | |
1226 | if (pfn_valid(pfn)) { | |
1227 | page = pfn_to_page(pfn); | |
1228 | if (PageLRU(page)) | |
1229 | return pfn; | |
1230 | } | |
1231 | } | |
1232 | return 0; | |
1233 | } | |
1234 | ||
0c0e6195 KH |
1235 | #define NR_OFFLINE_AT_ONCE_PAGES (256) |
1236 | static int | |
1237 | do_migrate_range(unsigned long start_pfn, unsigned long end_pfn) | |
1238 | { | |
1239 | unsigned long pfn; | |
1240 | struct page *page; | |
1241 | int move_pages = NR_OFFLINE_AT_ONCE_PAGES; | |
1242 | int not_managed = 0; | |
1243 | int ret = 0; | |
1244 | LIST_HEAD(source); | |
1245 | ||
1246 | for (pfn = start_pfn; pfn < end_pfn && move_pages > 0; pfn++) { | |
1247 | if (!pfn_valid(pfn)) | |
1248 | continue; | |
1249 | page = pfn_to_page(pfn); | |
700c2a46 | 1250 | if (!get_page_unless_zero(page)) |
0c0e6195 KH |
1251 | continue; |
1252 | /* | |
1253 | * We can skip free pages. And we can only deal with pages on | |
1254 | * LRU. | |
1255 | */ | |
62695a84 | 1256 | ret = isolate_lru_page(page); |
0c0e6195 | 1257 | if (!ret) { /* Success */ |
700c2a46 | 1258 | put_page(page); |
62695a84 | 1259 | list_add_tail(&page->lru, &source); |
0c0e6195 | 1260 | move_pages--; |
6d9c285a KM |
1261 | inc_zone_page_state(page, NR_ISOLATED_ANON + |
1262 | page_is_file_cache(page)); | |
1263 | ||
0c0e6195 | 1264 | } else { |
0c0e6195 | 1265 | #ifdef CONFIG_DEBUG_VM |
718a3821 WF |
1266 | printk(KERN_ALERT "removing pfn %lx from LRU failed\n", |
1267 | pfn); | |
1268 | dump_page(page); | |
0c0e6195 | 1269 | #endif |
700c2a46 | 1270 | put_page(page); |
25985edc | 1271 | /* Because we don't have big zone->lock. we should |
809c4449 BL |
1272 | check this again here. */ |
1273 | if (page_count(page)) { | |
1274 | not_managed++; | |
f3ab2636 | 1275 | ret = -EBUSY; |
809c4449 BL |
1276 | break; |
1277 | } | |
0c0e6195 KH |
1278 | } |
1279 | } | |
f3ab2636 BL |
1280 | if (!list_empty(&source)) { |
1281 | if (not_managed) { | |
1282 | putback_lru_pages(&source); | |
1283 | goto out; | |
1284 | } | |
74c08f98 MK |
1285 | |
1286 | /* | |
1287 | * alloc_migrate_target should be improooooved!! | |
1288 | * migrate_pages returns # of failed pages. | |
1289 | */ | |
1290 | ret = migrate_pages(&source, alloc_migrate_target, 0, | |
9c620e2b | 1291 | MIGRATE_SYNC, MR_MEMORY_HOTPLUG); |
f3ab2636 | 1292 | if (ret) |
0c0e6195 | 1293 | putback_lru_pages(&source); |
0c0e6195 | 1294 | } |
0c0e6195 KH |
1295 | out: |
1296 | return ret; | |
1297 | } | |
1298 | ||
1299 | /* | |
1300 | * remove from free_area[] and mark all as Reserved. | |
1301 | */ | |
1302 | static int | |
1303 | offline_isolated_pages_cb(unsigned long start, unsigned long nr_pages, | |
1304 | void *data) | |
1305 | { | |
1306 | __offline_isolated_pages(start, start + nr_pages); | |
1307 | return 0; | |
1308 | } | |
1309 | ||
1310 | static void | |
1311 | offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn) | |
1312 | { | |
908eedc6 | 1313 | walk_system_ram_range(start_pfn, end_pfn - start_pfn, NULL, |
0c0e6195 KH |
1314 | offline_isolated_pages_cb); |
1315 | } | |
1316 | ||
1317 | /* | |
1318 | * Check all pages in range, recoreded as memory resource, are isolated. | |
1319 | */ | |
1320 | static int | |
1321 | check_pages_isolated_cb(unsigned long start_pfn, unsigned long nr_pages, | |
1322 | void *data) | |
1323 | { | |
1324 | int ret; | |
1325 | long offlined = *(long *)data; | |
b023f468 | 1326 | ret = test_pages_isolated(start_pfn, start_pfn + nr_pages, true); |
0c0e6195 KH |
1327 | offlined = nr_pages; |
1328 | if (!ret) | |
1329 | *(long *)data += offlined; | |
1330 | return ret; | |
1331 | } | |
1332 | ||
1333 | static long | |
1334 | check_pages_isolated(unsigned long start_pfn, unsigned long end_pfn) | |
1335 | { | |
1336 | long offlined = 0; | |
1337 | int ret; | |
1338 | ||
908eedc6 | 1339 | ret = walk_system_ram_range(start_pfn, end_pfn - start_pfn, &offlined, |
0c0e6195 KH |
1340 | check_pages_isolated_cb); |
1341 | if (ret < 0) | |
1342 | offlined = (long)ret; | |
1343 | return offlined; | |
1344 | } | |
1345 | ||
09285af7 | 1346 | #ifdef CONFIG_MOVABLE_NODE |
79a4dcef TC |
1347 | /* |
1348 | * When CONFIG_MOVABLE_NODE, we permit offlining of a node which doesn't have | |
1349 | * normal memory. | |
1350 | */ | |
09285af7 LJ |
1351 | static bool can_offline_normal(struct zone *zone, unsigned long nr_pages) |
1352 | { | |
1353 | return true; | |
1354 | } | |
79a4dcef | 1355 | #else /* CONFIG_MOVABLE_NODE */ |
74d42d8f LJ |
1356 | /* ensure the node has NORMAL memory if it is still online */ |
1357 | static bool can_offline_normal(struct zone *zone, unsigned long nr_pages) | |
1358 | { | |
1359 | struct pglist_data *pgdat = zone->zone_pgdat; | |
1360 | unsigned long present_pages = 0; | |
1361 | enum zone_type zt; | |
1362 | ||
1363 | for (zt = 0; zt <= ZONE_NORMAL; zt++) | |
1364 | present_pages += pgdat->node_zones[zt].present_pages; | |
1365 | ||
1366 | if (present_pages > nr_pages) | |
1367 | return true; | |
1368 | ||
1369 | present_pages = 0; | |
1370 | for (; zt <= ZONE_MOVABLE; zt++) | |
1371 | present_pages += pgdat->node_zones[zt].present_pages; | |
1372 | ||
1373 | /* | |
1374 | * we can't offline the last normal memory until all | |
1375 | * higher memory is offlined. | |
1376 | */ | |
1377 | return present_pages == 0; | |
1378 | } | |
79a4dcef | 1379 | #endif /* CONFIG_MOVABLE_NODE */ |
74d42d8f | 1380 | |
d9713679 LJ |
1381 | /* check which state of node_states will be changed when offline memory */ |
1382 | static void node_states_check_changes_offline(unsigned long nr_pages, | |
1383 | struct zone *zone, struct memory_notify *arg) | |
1384 | { | |
1385 | struct pglist_data *pgdat = zone->zone_pgdat; | |
1386 | unsigned long present_pages = 0; | |
1387 | enum zone_type zt, zone_last = ZONE_NORMAL; | |
1388 | ||
1389 | /* | |
6715ddf9 LJ |
1390 | * If we have HIGHMEM or movable node, node_states[N_NORMAL_MEMORY] |
1391 | * contains nodes which have zones of 0...ZONE_NORMAL, | |
1392 | * set zone_last to ZONE_NORMAL. | |
d9713679 | 1393 | * |
6715ddf9 LJ |
1394 | * If we don't have HIGHMEM nor movable node, |
1395 | * node_states[N_NORMAL_MEMORY] contains nodes which have zones of | |
1396 | * 0...ZONE_MOVABLE, set zone_last to ZONE_MOVABLE. | |
d9713679 | 1397 | */ |
6715ddf9 | 1398 | if (N_MEMORY == N_NORMAL_MEMORY) |
d9713679 LJ |
1399 | zone_last = ZONE_MOVABLE; |
1400 | ||
1401 | /* | |
1402 | * check whether node_states[N_NORMAL_MEMORY] will be changed. | |
1403 | * If the memory to be offline is in a zone of 0...zone_last, | |
1404 | * and it is the last present memory, 0...zone_last will | |
1405 | * become empty after offline , thus we can determind we will | |
1406 | * need to clear the node from node_states[N_NORMAL_MEMORY]. | |
1407 | */ | |
1408 | for (zt = 0; zt <= zone_last; zt++) | |
1409 | present_pages += pgdat->node_zones[zt].present_pages; | |
1410 | if (zone_idx(zone) <= zone_last && nr_pages >= present_pages) | |
1411 | arg->status_change_nid_normal = zone_to_nid(zone); | |
1412 | else | |
1413 | arg->status_change_nid_normal = -1; | |
1414 | ||
6715ddf9 LJ |
1415 | #ifdef CONFIG_HIGHMEM |
1416 | /* | |
1417 | * If we have movable node, node_states[N_HIGH_MEMORY] | |
1418 | * contains nodes which have zones of 0...ZONE_HIGHMEM, | |
1419 | * set zone_last to ZONE_HIGHMEM. | |
1420 | * | |
1421 | * If we don't have movable node, node_states[N_NORMAL_MEMORY] | |
1422 | * contains nodes which have zones of 0...ZONE_MOVABLE, | |
1423 | * set zone_last to ZONE_MOVABLE. | |
1424 | */ | |
1425 | zone_last = ZONE_HIGHMEM; | |
1426 | if (N_MEMORY == N_HIGH_MEMORY) | |
1427 | zone_last = ZONE_MOVABLE; | |
1428 | ||
1429 | for (; zt <= zone_last; zt++) | |
1430 | present_pages += pgdat->node_zones[zt].present_pages; | |
1431 | if (zone_idx(zone) <= zone_last && nr_pages >= present_pages) | |
1432 | arg->status_change_nid_high = zone_to_nid(zone); | |
1433 | else | |
1434 | arg->status_change_nid_high = -1; | |
1435 | #else | |
1436 | arg->status_change_nid_high = arg->status_change_nid_normal; | |
1437 | #endif | |
1438 | ||
d9713679 LJ |
1439 | /* |
1440 | * node_states[N_HIGH_MEMORY] contains nodes which have 0...ZONE_MOVABLE | |
1441 | */ | |
1442 | zone_last = ZONE_MOVABLE; | |
1443 | ||
1444 | /* | |
1445 | * check whether node_states[N_HIGH_MEMORY] will be changed | |
1446 | * If we try to offline the last present @nr_pages from the node, | |
1447 | * we can determind we will need to clear the node from | |
1448 | * node_states[N_HIGH_MEMORY]. | |
1449 | */ | |
1450 | for (; zt <= zone_last; zt++) | |
1451 | present_pages += pgdat->node_zones[zt].present_pages; | |
1452 | if (nr_pages >= present_pages) | |
1453 | arg->status_change_nid = zone_to_nid(zone); | |
1454 | else | |
1455 | arg->status_change_nid = -1; | |
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 | ||
6715ddf9 LJ |
1463 | if ((N_MEMORY != N_NORMAL_MEMORY) && |
1464 | (arg->status_change_nid_high >= 0)) | |
d9713679 | 1465 | node_clear_state(node, N_HIGH_MEMORY); |
6715ddf9 LJ |
1466 | |
1467 | if ((N_MEMORY != N_HIGH_MEMORY) && | |
1468 | (arg->status_change_nid >= 0)) | |
1469 | node_clear_state(node, N_MEMORY); | |
d9713679 LJ |
1470 | } |
1471 | ||
a16cee10 | 1472 | static int __ref __offline_pages(unsigned long start_pfn, |
0c0e6195 KH |
1473 | unsigned long end_pfn, unsigned long timeout) |
1474 | { | |
1475 | unsigned long pfn, nr_pages, expire; | |
1476 | long offlined_pages; | |
7b78d335 | 1477 | int ret, drain, retry_max, node; |
0c0e6195 | 1478 | struct zone *zone; |
7b78d335 | 1479 | struct memory_notify arg; |
0c0e6195 KH |
1480 | |
1481 | BUG_ON(start_pfn >= end_pfn); | |
1482 | /* at least, alignment against pageblock is necessary */ | |
1483 | if (!IS_ALIGNED(start_pfn, pageblock_nr_pages)) | |
1484 | return -EINVAL; | |
1485 | if (!IS_ALIGNED(end_pfn, pageblock_nr_pages)) | |
1486 | return -EINVAL; | |
1487 | /* This makes hotplug much easier...and readable. | |
1488 | we assume this for now. .*/ | |
1489 | if (!test_pages_in_a_zone(start_pfn, end_pfn)) | |
1490 | return -EINVAL; | |
7b78d335 | 1491 | |
20d6c96b | 1492 | lock_memory_hotplug(); |
6ad696d2 | 1493 | |
7b78d335 YG |
1494 | zone = page_zone(pfn_to_page(start_pfn)); |
1495 | node = zone_to_nid(zone); | |
1496 | nr_pages = end_pfn - start_pfn; | |
1497 | ||
74d42d8f LJ |
1498 | ret = -EINVAL; |
1499 | if (zone_idx(zone) <= ZONE_NORMAL && !can_offline_normal(zone, nr_pages)) | |
1500 | goto out; | |
1501 | ||
0c0e6195 | 1502 | /* set above range as isolated */ |
b023f468 WC |
1503 | ret = start_isolate_page_range(start_pfn, end_pfn, |
1504 | MIGRATE_MOVABLE, true); | |
0c0e6195 | 1505 | if (ret) |
6ad696d2 | 1506 | goto out; |
7b78d335 YG |
1507 | |
1508 | arg.start_pfn = start_pfn; | |
1509 | arg.nr_pages = nr_pages; | |
d9713679 | 1510 | node_states_check_changes_offline(nr_pages, zone, &arg); |
7b78d335 YG |
1511 | |
1512 | ret = memory_notify(MEM_GOING_OFFLINE, &arg); | |
1513 | ret = notifier_to_errno(ret); | |
1514 | if (ret) | |
1515 | goto failed_removal; | |
1516 | ||
0c0e6195 KH |
1517 | pfn = start_pfn; |
1518 | expire = jiffies + timeout; | |
1519 | drain = 0; | |
1520 | retry_max = 5; | |
1521 | repeat: | |
1522 | /* start memory hot removal */ | |
1523 | ret = -EAGAIN; | |
1524 | if (time_after(jiffies, expire)) | |
1525 | goto failed_removal; | |
1526 | ret = -EINTR; | |
1527 | if (signal_pending(current)) | |
1528 | goto failed_removal; | |
1529 | ret = 0; | |
1530 | if (drain) { | |
1531 | lru_add_drain_all(); | |
0c0e6195 | 1532 | cond_resched(); |
9f8f2172 | 1533 | drain_all_pages(); |
0c0e6195 KH |
1534 | } |
1535 | ||
1536 | pfn = scan_lru_pages(start_pfn, end_pfn); | |
1537 | if (pfn) { /* We have page on LRU */ | |
1538 | ret = do_migrate_range(pfn, end_pfn); | |
1539 | if (!ret) { | |
1540 | drain = 1; | |
1541 | goto repeat; | |
1542 | } else { | |
1543 | if (ret < 0) | |
1544 | if (--retry_max == 0) | |
1545 | goto failed_removal; | |
1546 | yield(); | |
1547 | drain = 1; | |
1548 | goto repeat; | |
1549 | } | |
1550 | } | |
b3834be5 | 1551 | /* drain all zone's lru pagevec, this is asynchronous... */ |
0c0e6195 | 1552 | lru_add_drain_all(); |
0c0e6195 | 1553 | yield(); |
b3834be5 | 1554 | /* drain pcp pages, this is synchronous. */ |
9f8f2172 | 1555 | drain_all_pages(); |
0c0e6195 KH |
1556 | /* check again */ |
1557 | offlined_pages = check_pages_isolated(start_pfn, end_pfn); | |
1558 | if (offlined_pages < 0) { | |
1559 | ret = -EBUSY; | |
1560 | goto failed_removal; | |
1561 | } | |
1562 | printk(KERN_INFO "Offlined Pages %ld\n", offlined_pages); | |
b3834be5 | 1563 | /* Ok, all of our target is isolated. |
0c0e6195 KH |
1564 | We cannot do rollback at this point. */ |
1565 | offline_isolated_pages(start_pfn, end_pfn); | |
dbc0e4ce | 1566 | /* reset pagetype flags and makes migrate type to be MOVABLE */ |
0815f3d8 | 1567 | undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE); |
0c0e6195 | 1568 | /* removal success */ |
9feedc9d | 1569 | zone->managed_pages -= offlined_pages; |
0c0e6195 KH |
1570 | zone->present_pages -= offlined_pages; |
1571 | zone->zone_pgdat->node_present_pages -= offlined_pages; | |
1572 | totalram_pages -= offlined_pages; | |
7b78d335 | 1573 | |
1b79acc9 KM |
1574 | init_per_zone_wmark_min(); |
1575 | ||
1e8537ba | 1576 | if (!populated_zone(zone)) { |
340175b7 | 1577 | zone_pcp_reset(zone); |
1e8537ba XQ |
1578 | mutex_lock(&zonelists_mutex); |
1579 | build_all_zonelists(NULL, NULL); | |
1580 | mutex_unlock(&zonelists_mutex); | |
1581 | } else | |
1582 | zone_pcp_update(zone); | |
340175b7 | 1583 | |
d9713679 LJ |
1584 | node_states_clear_node(node, &arg); |
1585 | if (arg.status_change_nid >= 0) | |
8fe23e05 | 1586 | kswapd_stop(node); |
bce7394a | 1587 | |
0c0e6195 KH |
1588 | vm_total_pages = nr_free_pagecache_pages(); |
1589 | writeback_set_ratelimit(); | |
7b78d335 YG |
1590 | |
1591 | memory_notify(MEM_OFFLINE, &arg); | |
20d6c96b | 1592 | unlock_memory_hotplug(); |
0c0e6195 KH |
1593 | return 0; |
1594 | ||
1595 | failed_removal: | |
a62e2f4f BH |
1596 | printk(KERN_INFO "memory offlining [mem %#010llx-%#010llx] failed\n", |
1597 | (unsigned long long) start_pfn << PAGE_SHIFT, | |
1598 | ((unsigned long long) end_pfn << PAGE_SHIFT) - 1); | |
7b78d335 | 1599 | memory_notify(MEM_CANCEL_OFFLINE, &arg); |
0c0e6195 | 1600 | /* pushback to free area */ |
0815f3d8 | 1601 | undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE); |
7b78d335 | 1602 | |
6ad696d2 | 1603 | out: |
20d6c96b | 1604 | unlock_memory_hotplug(); |
0c0e6195 KH |
1605 | return ret; |
1606 | } | |
71088785 | 1607 | |
a16cee10 WC |
1608 | int offline_pages(unsigned long start_pfn, unsigned long nr_pages) |
1609 | { | |
1610 | return __offline_pages(start_pfn, start_pfn + nr_pages, 120 * HZ); | |
1611 | } | |
1612 | ||
bbc76be6 WC |
1613 | /** |
1614 | * walk_memory_range - walks through all mem sections in [start_pfn, end_pfn) | |
1615 | * @start_pfn: start pfn of the memory range | |
1616 | * @end_pfn: end pft of the memory range | |
1617 | * @arg: argument passed to func | |
1618 | * @func: callback for each memory section walked | |
1619 | * | |
1620 | * This function walks through all present mem sections in range | |
1621 | * [start_pfn, end_pfn) and call func on each mem section. | |
1622 | * | |
1623 | * Returns the return value of func. | |
1624 | */ | |
1625 | static int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn, | |
1626 | void *arg, int (*func)(struct memory_block *, void *)) | |
71088785 | 1627 | { |
e90bdb7f WC |
1628 | struct memory_block *mem = NULL; |
1629 | struct mem_section *section; | |
e90bdb7f WC |
1630 | unsigned long pfn, section_nr; |
1631 | int ret; | |
e90bdb7f WC |
1632 | |
1633 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { | |
1634 | section_nr = pfn_to_section_nr(pfn); | |
1635 | if (!present_section_nr(section_nr)) | |
1636 | continue; | |
1637 | ||
1638 | section = __nr_to_section(section_nr); | |
1639 | /* same memblock? */ | |
1640 | if (mem) | |
1641 | if ((section_nr >= mem->start_section_nr) && | |
1642 | (section_nr <= mem->end_section_nr)) | |
1643 | continue; | |
1644 | ||
1645 | mem = find_memory_block_hinted(section, mem); | |
1646 | if (!mem) | |
1647 | continue; | |
1648 | ||
bbc76be6 | 1649 | ret = func(mem, arg); |
e90bdb7f | 1650 | if (ret) { |
bbc76be6 WC |
1651 | kobject_put(&mem->dev.kobj); |
1652 | return ret; | |
e90bdb7f WC |
1653 | } |
1654 | } | |
1655 | ||
1656 | if (mem) | |
1657 | kobject_put(&mem->dev.kobj); | |
1658 | ||
bbc76be6 WC |
1659 | return 0; |
1660 | } | |
1661 | ||
1662 | /** | |
1663 | * offline_memory_block_cb - callback function for offlining memory block | |
1664 | * @mem: the memory block to be offlined | |
1665 | * @arg: buffer to hold error msg | |
1666 | * | |
1667 | * Always return 0, and put the error msg in arg if any. | |
1668 | */ | |
1669 | static int offline_memory_block_cb(struct memory_block *mem, void *arg) | |
1670 | { | |
1671 | int *ret = arg; | |
1672 | int error = offline_memory_block(mem); | |
1673 | ||
1674 | if (error != 0 && *ret == 0) | |
1675 | *ret = error; | |
1676 | ||
1677 | return 0; | |
1678 | } | |
1679 | ||
1680 | static int is_memblock_offlined_cb(struct memory_block *mem, void *arg) | |
1681 | { | |
1682 | int ret = !is_memblock_offlined(mem); | |
1683 | ||
1684 | if (unlikely(ret)) | |
1685 | pr_warn("removing memory fails, because memory " | |
1686 | "[%#010llx-%#010llx] is onlined\n", | |
1687 | PFN_PHYS(section_nr_to_pfn(mem->start_section_nr)), | |
1688 | PFN_PHYS(section_nr_to_pfn(mem->end_section_nr + 1))-1); | |
1689 | ||
1690 | return ret; | |
1691 | } | |
1692 | ||
60a5a19e TC |
1693 | static int check_cpu_on_node(void *data) |
1694 | { | |
1695 | struct pglist_data *pgdat = data; | |
1696 | int cpu; | |
1697 | ||
1698 | for_each_present_cpu(cpu) { | |
1699 | if (cpu_to_node(cpu) == pgdat->node_id) | |
1700 | /* | |
1701 | * the cpu on this node isn't removed, and we can't | |
1702 | * offline this node. | |
1703 | */ | |
1704 | return -EBUSY; | |
1705 | } | |
1706 | ||
1707 | return 0; | |
1708 | } | |
1709 | ||
e13fe869 WC |
1710 | static void unmap_cpu_on_node(void *data) |
1711 | { | |
1712 | #ifdef CONFIG_ACPI_NUMA | |
1713 | struct pglist_data *pgdat = data; | |
1714 | int cpu; | |
1715 | ||
1716 | for_each_possible_cpu(cpu) | |
1717 | if (cpu_to_node(cpu) == pgdat->node_id) | |
1718 | numa_clear_node(cpu); | |
1719 | #endif | |
1720 | } | |
1721 | ||
1722 | static int check_and_unmap_cpu_on_node(void *data) | |
1723 | { | |
1724 | int ret = check_cpu_on_node(data); | |
1725 | ||
1726 | if (ret) | |
1727 | return ret; | |
1728 | ||
1729 | /* | |
1730 | * the node will be offlined when we come here, so we can clear | |
1731 | * the cpu_to_node() now. | |
1732 | */ | |
1733 | ||
1734 | unmap_cpu_on_node(data); | |
1735 | return 0; | |
1736 | } | |
1737 | ||
60a5a19e | 1738 | /* offline the node if all memory sections of this node are removed */ |
90b30cdc | 1739 | void try_offline_node(int nid) |
60a5a19e | 1740 | { |
d822b86a WC |
1741 | pg_data_t *pgdat = NODE_DATA(nid); |
1742 | unsigned long start_pfn = pgdat->node_start_pfn; | |
1743 | unsigned long end_pfn = start_pfn + pgdat->node_spanned_pages; | |
60a5a19e | 1744 | unsigned long pfn; |
d822b86a WC |
1745 | struct page *pgdat_page = virt_to_page(pgdat); |
1746 | int i; | |
60a5a19e TC |
1747 | |
1748 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { | |
1749 | unsigned long section_nr = pfn_to_section_nr(pfn); | |
1750 | ||
1751 | if (!present_section_nr(section_nr)) | |
1752 | continue; | |
1753 | ||
1754 | if (pfn_to_nid(pfn) != nid) | |
1755 | continue; | |
1756 | ||
1757 | /* | |
1758 | * some memory sections of this node are not removed, and we | |
1759 | * can't offline node now. | |
1760 | */ | |
1761 | return; | |
1762 | } | |
1763 | ||
e13fe869 | 1764 | if (stop_machine(check_and_unmap_cpu_on_node, pgdat, NULL)) |
60a5a19e TC |
1765 | return; |
1766 | ||
1767 | /* | |
1768 | * all memory/cpu of this node are removed, we can offline this | |
1769 | * node now. | |
1770 | */ | |
1771 | node_set_offline(nid); | |
1772 | unregister_one_node(nid); | |
d822b86a WC |
1773 | |
1774 | if (!PageSlab(pgdat_page) && !PageCompound(pgdat_page)) | |
1775 | /* node data is allocated from boot memory */ | |
1776 | return; | |
1777 | ||
1778 | /* free waittable in each zone */ | |
1779 | for (i = 0; i < MAX_NR_ZONES; i++) { | |
1780 | struct zone *zone = pgdat->node_zones + i; | |
1781 | ||
1782 | if (zone->wait_table) | |
1783 | vfree(zone->wait_table); | |
1784 | } | |
1785 | ||
1786 | /* | |
1787 | * Since there is no way to guarentee the address of pgdat/zone is not | |
1788 | * on stack of any kernel threads or used by other kernel objects | |
1789 | * without reference counting or other symchronizing method, do not | |
1790 | * reset node_data and free pgdat here. Just reset it to 0 and reuse | |
1791 | * the memory when the node is online again. | |
1792 | */ | |
1793 | memset(pgdat, 0, sizeof(*pgdat)); | |
60a5a19e | 1794 | } |
90b30cdc | 1795 | EXPORT_SYMBOL(try_offline_node); |
60a5a19e TC |
1796 | |
1797 | int __ref remove_memory(int nid, u64 start, u64 size) | |
bbc76be6 WC |
1798 | { |
1799 | unsigned long start_pfn, end_pfn; | |
1800 | int ret = 0; | |
1801 | int retry = 1; | |
1802 | ||
1803 | start_pfn = PFN_DOWN(start); | |
1804 | end_pfn = start_pfn + PFN_DOWN(size); | |
1805 | ||
1806 | /* | |
1807 | * When CONFIG_MEMCG is on, one memory block may be used by other | |
1808 | * blocks to store page cgroup when onlining pages. But we don't know | |
1809 | * in what order pages are onlined. So we iterate twice to offline | |
1810 | * memory: | |
1811 | * 1st iterate: offline every non primary memory block. | |
1812 | * 2nd iterate: offline primary (i.e. first added) memory block. | |
1813 | */ | |
1814 | repeat: | |
1815 | walk_memory_range(start_pfn, end_pfn, &ret, | |
1816 | offline_memory_block_cb); | |
1817 | if (ret) { | |
1818 | if (!retry) | |
1819 | return ret; | |
1820 | ||
1821 | retry = 0; | |
1822 | ret = 0; | |
993c1aad WC |
1823 | goto repeat; |
1824 | } | |
1825 | ||
6677e3ea YI |
1826 | lock_memory_hotplug(); |
1827 | ||
1828 | /* | |
1829 | * we have offlined all memory blocks like this: | |
1830 | * 1. lock memory hotplug | |
1831 | * 2. offline a memory block | |
1832 | * 3. unlock memory hotplug | |
1833 | * | |
1834 | * repeat step1-3 to offline the memory block. All memory blocks | |
1835 | * must be offlined before removing memory. But we don't hold the | |
1836 | * lock in the whole operation. So we should check whether all | |
1837 | * memory blocks are offlined. | |
1838 | */ | |
1839 | ||
bbc76be6 WC |
1840 | ret = walk_memory_range(start_pfn, end_pfn, NULL, |
1841 | is_memblock_offlined_cb); | |
1842 | if (ret) { | |
1843 | unlock_memory_hotplug(); | |
1844 | return ret; | |
6677e3ea YI |
1845 | } |
1846 | ||
46c66c4b YI |
1847 | /* remove memmap entry */ |
1848 | firmware_map_remove(start, start + size, "System RAM"); | |
1849 | ||
24d335ca WC |
1850 | arch_remove_memory(start, size); |
1851 | ||
60a5a19e TC |
1852 | try_offline_node(nid); |
1853 | ||
6677e3ea YI |
1854 | unlock_memory_hotplug(); |
1855 | ||
e90bdb7f | 1856 | return 0; |
71088785 | 1857 | } |
48e94196 | 1858 | #else |
a16cee10 WC |
1859 | int offline_pages(unsigned long start_pfn, unsigned long nr_pages) |
1860 | { | |
1861 | return -EINVAL; | |
1862 | } | |
60a5a19e | 1863 | int remove_memory(int nid, u64 start, u64 size) |
48e94196 KH |
1864 | { |
1865 | return -EINVAL; | |
1866 | } | |
0c0e6195 | 1867 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
71088785 | 1868 | EXPORT_SYMBOL_GPL(remove_memory); |