blob: ca1dd3aa5eee89a924da879735d59b26cd96387f [file] [log] [blame]
Dave Hansen3947be12005-10-29 18:16:54 -07001/*
2 * linux/mm/memory_hotplug.c
3 *
4 * Copyright (C)
5 */
6
Dave Hansen3947be12005-10-29 18:16:54 -07007#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>
Paul Gortmakerb95f1b312011-10-16 02:01:52 -040014#include <linux/export.h>
Dave Hansen3947be12005-10-29 18:16:54 -070015#include <linux/pagevec.h>
Chandra Seetharaman2d1d43f2006-09-29 02:01:25 -070016#include <linux/writeback.h>
Dave Hansen3947be12005-10-29 18:16:54 -070017#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>
KAMEZAWA Hiroyuki0a547032006-06-27 02:53:35 -070024#include <linux/ioport.h>
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -070025#include <linux/delay.h>
26#include <linux/migrate.h>
27#include <linux/page-isolation.h>
Badari Pulavarty71088782008-10-18 20:25:58 -070028#include <linux/pfn.h>
Andi Kleen6ad696d2009-11-17 14:06:22 -080029#include <linux/suspend.h>
KOSAKI Motohiro6d9c2852009-12-14 17:58:11 -080030#include <linux/mm_inline.h>
akpm@linux-foundation.orgd96ae532010-03-05 13:41:58 -080031#include <linux/firmware-map.h>
Tang Chen60a5a192013-02-22 16:33:14 -080032#include <linux/stop_machine.h>
Dave Hansen3947be12005-10-29 18:16:54 -070033
34#include <asm/tlbflush.h>
35
Adrian Bunk1e5ad9a2008-04-28 20:40:08 +030036#include "internal.h"
37
Daniel Kiper9d0ad8c2011-07-25 17:12:05 -070038/*
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
45static void generic_online_page(struct page *page);
46
47static online_page_callback_t online_page_callback = generic_online_page;
48
KOSAKI Motohiro20d6c962010-12-02 14:31:19 -080049DEFINE_MUTEX(mem_hotplug_mutex);
50
51void 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
59void unlock_memory_hotplug(void)
60{
61 unlock_system_sleep();
62 mutex_unlock(&mem_hotplug_mutex);
63}
64
65
Keith Mannthey45e0b782006-09-30 23:27:09 -070066/* add this memory to iomem resource */
67static 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;
Yasunori Goto887c3cb2007-11-14 16:59:20 -080076 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
Keith Mannthey45e0b782006-09-30 23:27:09 -070077 if (request_resource(&iomem_resource, res) < 0) {
Toshi Kani4996eed2013-07-03 15:02:39 -070078 pr_debug("System RAM resource %pR cannot be added\n", res);
Keith Mannthey45e0b782006-09-30 23:27:09 -070079 kfree(res);
80 res = NULL;
81 }
82 return res;
83}
84
85static void release_memory_resource(struct resource *res)
86{
87 if (!res)
88 return;
89 release_resource(res);
90 kfree(res);
91 return;
92}
93
Keith Mannthey53947022006-09-30 23:27:08 -070094#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
Yasuaki Ishimatsu46723bf2013-02-22 16:33:00 -080095void get_page_bootmem(unsigned long info, struct page *page,
96 unsigned long type)
Yasunori Goto04753272008-04-28 02:13:31 -070097{
Andrea Arcangeli5f24ce52011-01-13 15:47:00 -080098 page->lru.next = (struct list_head *) type;
Yasunori Goto04753272008-04-28 02:13:31 -070099 SetPagePrivate(page);
100 set_page_private(page, info);
101 atomic_inc(&page->_count);
102}
103
Jiang Liu170a5a72013-07-03 15:03:17 -0700104void put_page_bootmem(struct page *page)
Yasunori Goto04753272008-04-28 02:13:31 -0700105{
Andrea Arcangeli5f24ce52011-01-13 15:47:00 -0800106 unsigned long type;
Yasunori Goto04753272008-04-28 02:13:31 -0700107
Andrea Arcangeli5f24ce52011-01-13 15:47:00 -0800108 type = (unsigned long) page->lru.next;
109 BUG_ON(type < MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE ||
110 type > MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE);
Yasunori Goto04753272008-04-28 02:13:31 -0700111
112 if (atomic_dec_return(&page->_count) == 1) {
113 ClearPagePrivate(page);
114 set_page_private(page, 0);
Andrea Arcangeli5f24ce52011-01-13 15:47:00 -0800115 INIT_LIST_HEAD(&page->lru);
Jiang Liu170a5a72013-07-03 15:03:17 -0700116 free_reserved_page(page);
Yasunori Goto04753272008-04-28 02:13:31 -0700117 }
Yasunori Goto04753272008-04-28 02:13:31 -0700118}
119
Yasuaki Ishimatsu46723bf2013-02-22 16:33:00 -0800120#ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE
121#ifndef CONFIG_SPARSEMEM_VMEMMAP
Adrian Bunkd92bc312008-07-23 21:28:12 -0700122static void register_page_bootmem_info_section(unsigned long start_pfn)
Yasunori Goto04753272008-04-28 02:13:31 -0700123{
124 unsigned long *usemap, mapsize, section_nr, i;
125 struct mem_section *ms;
126 struct page *page, *memmap;
127
Yasunori Goto04753272008-04-28 02:13:31 -0700128 section_nr = pfn_to_section_nr(start_pfn);
129 ms = __nr_to_section(section_nr);
130
131 /* Get section's memmap address */
132 memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr);
133
134 /*
135 * Get page for the memmap's phys address
136 * XXX: need more consideration for sparse_vmemmap...
137 */
138 page = virt_to_page(memmap);
139 mapsize = sizeof(struct page) * PAGES_PER_SECTION;
140 mapsize = PAGE_ALIGN(mapsize) >> PAGE_SHIFT;
141
142 /* remember memmap's page */
143 for (i = 0; i < mapsize; i++, page++)
144 get_page_bootmem(section_nr, page, SECTION_INFO);
145
146 usemap = __nr_to_section(section_nr)->pageblock_flags;
147 page = virt_to_page(usemap);
148
149 mapsize = PAGE_ALIGN(usemap_size()) >> PAGE_SHIFT;
150
151 for (i = 0; i < mapsize; i++, page++)
Yasunori Gotoaf370fb2008-07-23 21:28:17 -0700152 get_page_bootmem(section_nr, page, MIX_SECTION_INFO);
Yasunori Goto04753272008-04-28 02:13:31 -0700153
154}
Yasuaki Ishimatsu46723bf2013-02-22 16:33:00 -0800155#else /* CONFIG_SPARSEMEM_VMEMMAP */
156static void register_page_bootmem_info_section(unsigned long start_pfn)
157{
158 unsigned long *usemap, mapsize, section_nr, i;
159 struct mem_section *ms;
160 struct page *page, *memmap;
161
162 if (!pfn_valid(start_pfn))
163 return;
164
165 section_nr = pfn_to_section_nr(start_pfn);
166 ms = __nr_to_section(section_nr);
167
168 memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr);
169
170 register_page_bootmem_memmap(section_nr, memmap, PAGES_PER_SECTION);
171
172 usemap = __nr_to_section(section_nr)->pageblock_flags;
173 page = virt_to_page(usemap);
174
175 mapsize = PAGE_ALIGN(usemap_size()) >> PAGE_SHIFT;
176
177 for (i = 0; i < mapsize; i++, page++)
178 get_page_bootmem(section_nr, page, MIX_SECTION_INFO);
179}
180#endif /* !CONFIG_SPARSEMEM_VMEMMAP */
Yasunori Goto04753272008-04-28 02:13:31 -0700181
182void register_page_bootmem_info_node(struct pglist_data *pgdat)
183{
184 unsigned long i, pfn, end_pfn, nr_pages;
185 int node = pgdat->node_id;
186 struct page *page;
187 struct zone *zone;
188
189 nr_pages = PAGE_ALIGN(sizeof(struct pglist_data)) >> PAGE_SHIFT;
190 page = virt_to_page(pgdat);
191
192 for (i = 0; i < nr_pages; i++, page++)
193 get_page_bootmem(node, page, NODE_INFO);
194
195 zone = &pgdat->node_zones[0];
196 for (; zone < pgdat->node_zones + MAX_NR_ZONES - 1; zone++) {
197 if (zone->wait_table) {
198 nr_pages = zone->wait_table_hash_nr_entries
199 * sizeof(wait_queue_head_t);
200 nr_pages = PAGE_ALIGN(nr_pages) >> PAGE_SHIFT;
201 page = virt_to_page(zone->wait_table);
202
203 for (i = 0; i < nr_pages; i++, page++)
204 get_page_bootmem(node, page, NODE_INFO);
205 }
206 }
207
208 pfn = pgdat->node_start_pfn;
Cody P Schaferc1f19492013-02-22 16:35:32 -0800209 end_pfn = pgdat_end_pfn(pgdat);
Yasunori Goto04753272008-04-28 02:13:31 -0700210
Tang Chen7e9f5eb2013-07-08 16:00:23 -0700211 /* register section info */
qiuxishif14851a2012-09-17 14:09:24 -0700212 for (; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
213 /*
214 * Some platforms can assign the same pfn to multiple nodes - on
215 * node0 as well as nodeN. To avoid registering a pfn against
216 * multiple nodes we check that this pfn does not already
Tang Chen7e9f5eb2013-07-08 16:00:23 -0700217 * reside in some other nodes.
qiuxishif14851a2012-09-17 14:09:24 -0700218 */
219 if (pfn_valid(pfn) && (pfn_to_nid(pfn) == node))
220 register_page_bootmem_info_section(pfn);
221 }
Yasunori Goto04753272008-04-28 02:13:31 -0700222}
Yasuaki Ishimatsu46723bf2013-02-22 16:33:00 -0800223#endif /* CONFIG_HAVE_BOOTMEM_INFO_NODE */
Yasunori Goto04753272008-04-28 02:13:31 -0700224
Heiko Carstens76cdd582008-05-14 16:05:52 -0700225static void grow_zone_span(struct zone *zone, unsigned long start_pfn,
226 unsigned long end_pfn)
227{
228 unsigned long old_zone_end_pfn;
229
230 zone_span_writelock(zone);
231
232 old_zone_end_pfn = zone->zone_start_pfn + zone->spanned_pages;
Tang Chen712cd382012-12-11 16:01:07 -0800233 if (!zone->spanned_pages || start_pfn < zone->zone_start_pfn)
Heiko Carstens76cdd582008-05-14 16:05:52 -0700234 zone->zone_start_pfn = start_pfn;
235
236 zone->spanned_pages = max(old_zone_end_pfn, end_pfn) -
237 zone->zone_start_pfn;
238
239 zone_span_writeunlock(zone);
240}
241
Lai Jiangshan511c2ab2012-12-11 16:03:16 -0800242static void resize_zone(struct zone *zone, unsigned long start_pfn,
243 unsigned long end_pfn)
244{
245 zone_span_writelock(zone);
246
Lai Jiangshane455a9b2012-12-11 16:03:20 -0800247 if (end_pfn - start_pfn) {
248 zone->zone_start_pfn = start_pfn;
249 zone->spanned_pages = end_pfn - start_pfn;
250 } else {
251 /*
252 * make it consist as free_area_init_core(),
253 * if spanned_pages = 0, then keep start_pfn = 0
254 */
255 zone->zone_start_pfn = 0;
256 zone->spanned_pages = 0;
257 }
Lai Jiangshan511c2ab2012-12-11 16:03:16 -0800258
259 zone_span_writeunlock(zone);
260}
261
262static void fix_zone_id(struct zone *zone, unsigned long start_pfn,
263 unsigned long end_pfn)
264{
265 enum zone_type zid = zone_idx(zone);
266 int nid = zone->zone_pgdat->node_id;
267 unsigned long pfn;
268
269 for (pfn = start_pfn; pfn < end_pfn; pfn++)
270 set_page_links(pfn_to_page(pfn), zid, nid, pfn);
271}
272
Cody P Schaferf6bbb782013-02-22 16:35:30 -0800273/* Can fail with -ENOMEM from allocating a wait table with vmalloc() or
274 * alloc_bootmem_node_nopanic() */
275static int __ref ensure_zone_is_initialized(struct zone *zone,
276 unsigned long start_pfn, unsigned long num_pages)
277{
278 if (!zone_is_initialized(zone))
279 return init_currently_empty_zone(zone, start_pfn, num_pages,
280 MEMMAP_HOTPLUG);
281 return 0;
282}
283
Lai Jiangshane455a9b2012-12-11 16:03:20 -0800284static int __meminit move_pfn_range_left(struct zone *z1, struct zone *z2,
Lai Jiangshan511c2ab2012-12-11 16:03:16 -0800285 unsigned long start_pfn, unsigned long end_pfn)
286{
Lai Jiangshane455a9b2012-12-11 16:03:20 -0800287 int ret;
Lai Jiangshan511c2ab2012-12-11 16:03:16 -0800288 unsigned long flags;
Lai Jiangshane455a9b2012-12-11 16:03:20 -0800289 unsigned long z1_start_pfn;
290
Cody P Schafer64dd1b22013-02-22 16:35:31 -0800291 ret = ensure_zone_is_initialized(z1, start_pfn, end_pfn - start_pfn);
292 if (ret)
293 return ret;
Lai Jiangshan511c2ab2012-12-11 16:03:16 -0800294
295 pgdat_resize_lock(z1->zone_pgdat, &flags);
296
297 /* can't move pfns which are higher than @z2 */
Cody P Schafer108bcc92013-02-22 16:35:23 -0800298 if (end_pfn > zone_end_pfn(z2))
Lai Jiangshan511c2ab2012-12-11 16:03:16 -0800299 goto out_fail;
Jiang Liu834405c2013-07-03 15:03:04 -0700300 /* the move out part must be at the left most of @z2 */
Lai Jiangshan511c2ab2012-12-11 16:03:16 -0800301 if (start_pfn > z2->zone_start_pfn)
302 goto out_fail;
303 /* must included/overlap */
304 if (end_pfn <= z2->zone_start_pfn)
305 goto out_fail;
306
Lai Jiangshane455a9b2012-12-11 16:03:20 -0800307 /* use start_pfn for z1's start_pfn if z1 is empty */
308 if (z1->spanned_pages)
309 z1_start_pfn = z1->zone_start_pfn;
310 else
311 z1_start_pfn = start_pfn;
312
313 resize_zone(z1, z1_start_pfn, end_pfn);
Cody P Schafer108bcc92013-02-22 16:35:23 -0800314 resize_zone(z2, end_pfn, zone_end_pfn(z2));
Lai Jiangshan511c2ab2012-12-11 16:03:16 -0800315
316 pgdat_resize_unlock(z1->zone_pgdat, &flags);
317
318 fix_zone_id(z1, start_pfn, end_pfn);
319
320 return 0;
321out_fail:
322 pgdat_resize_unlock(z1->zone_pgdat, &flags);
323 return -1;
324}
325
Lai Jiangshane455a9b2012-12-11 16:03:20 -0800326static int __meminit move_pfn_range_right(struct zone *z1, struct zone *z2,
Lai Jiangshan511c2ab2012-12-11 16:03:16 -0800327 unsigned long start_pfn, unsigned long end_pfn)
328{
Lai Jiangshane455a9b2012-12-11 16:03:20 -0800329 int ret;
Lai Jiangshan511c2ab2012-12-11 16:03:16 -0800330 unsigned long flags;
Lai Jiangshane455a9b2012-12-11 16:03:20 -0800331 unsigned long z2_end_pfn;
332
Cody P Schafer64dd1b22013-02-22 16:35:31 -0800333 ret = ensure_zone_is_initialized(z2, start_pfn, end_pfn - start_pfn);
334 if (ret)
335 return ret;
Lai Jiangshan511c2ab2012-12-11 16:03:16 -0800336
337 pgdat_resize_lock(z1->zone_pgdat, &flags);
338
339 /* can't move pfns which are lower than @z1 */
340 if (z1->zone_start_pfn > start_pfn)
341 goto out_fail;
342 /* the move out part mast at the right most of @z1 */
Cody P Schafer108bcc92013-02-22 16:35:23 -0800343 if (zone_end_pfn(z1) > end_pfn)
Lai Jiangshan511c2ab2012-12-11 16:03:16 -0800344 goto out_fail;
345 /* must included/overlap */
Cody P Schafer108bcc92013-02-22 16:35:23 -0800346 if (start_pfn >= zone_end_pfn(z1))
Lai Jiangshan511c2ab2012-12-11 16:03:16 -0800347 goto out_fail;
348
Lai Jiangshane455a9b2012-12-11 16:03:20 -0800349 /* use end_pfn for z2's end_pfn if z2 is empty */
350 if (z2->spanned_pages)
Cody P Schafer108bcc92013-02-22 16:35:23 -0800351 z2_end_pfn = zone_end_pfn(z2);
Lai Jiangshane455a9b2012-12-11 16:03:20 -0800352 else
353 z2_end_pfn = end_pfn;
354
Lai Jiangshan511c2ab2012-12-11 16:03:16 -0800355 resize_zone(z1, z1->zone_start_pfn, start_pfn);
Lai Jiangshane455a9b2012-12-11 16:03:20 -0800356 resize_zone(z2, start_pfn, z2_end_pfn);
Lai Jiangshan511c2ab2012-12-11 16:03:16 -0800357
358 pgdat_resize_unlock(z1->zone_pgdat, &flags);
359
360 fix_zone_id(z2, start_pfn, end_pfn);
361
362 return 0;
363out_fail:
364 pgdat_resize_unlock(z1->zone_pgdat, &flags);
365 return -1;
366}
367
Heiko Carstens76cdd582008-05-14 16:05:52 -0700368static void grow_pgdat_span(struct pglist_data *pgdat, unsigned long start_pfn,
369 unsigned long end_pfn)
370{
371 unsigned long old_pgdat_end_pfn =
372 pgdat->node_start_pfn + pgdat->node_spanned_pages;
373
Tang Chen712cd382012-12-11 16:01:07 -0800374 if (!pgdat->node_spanned_pages || start_pfn < pgdat->node_start_pfn)
Heiko Carstens76cdd582008-05-14 16:05:52 -0700375 pgdat->node_start_pfn = start_pfn;
376
377 pgdat->node_spanned_pages = max(old_pgdat_end_pfn, end_pfn) -
378 pgdat->node_start_pfn;
379}
380
Al Viro31168482008-11-22 17:33:24 +0000381static int __meminit __add_zone(struct zone *zone, unsigned long phys_start_pfn)
Dave Hansen3947be12005-10-29 18:16:54 -0700382{
383 struct pglist_data *pgdat = zone->zone_pgdat;
384 int nr_pages = PAGES_PER_SECTION;
385 int nid = pgdat->node_id;
386 int zone_type;
Heiko Carstens76cdd582008-05-14 16:05:52 -0700387 unsigned long flags;
Cody P Schafer64dd1b22013-02-22 16:35:31 -0800388 int ret;
Dave Hansen3947be12005-10-29 18:16:54 -0700389
390 zone_type = zone - pgdat->node_zones;
Cody P Schafer64dd1b22013-02-22 16:35:31 -0800391 ret = ensure_zone_is_initialized(zone, phys_start_pfn, nr_pages);
392 if (ret)
393 return ret;
Heiko Carstens76cdd582008-05-14 16:05:52 -0700394
Heiko Carstens76cdd582008-05-14 16:05:52 -0700395 pgdat_resize_lock(zone->zone_pgdat, &flags);
396 grow_zone_span(zone, phys_start_pfn, phys_start_pfn + nr_pages);
397 grow_pgdat_span(zone->zone_pgdat, phys_start_pfn,
398 phys_start_pfn + nr_pages);
399 pgdat_resize_unlock(zone->zone_pgdat, &flags);
Dave Hansena2f3aa022007-01-10 23:15:30 -0800400 memmap_init_zone(nr_pages, nid, zone_type,
401 phys_start_pfn, MEMMAP_HOTPLUG);
Yasunori Goto718127c2006-06-23 02:03:10 -0700402 return 0;
Dave Hansen3947be12005-10-29 18:16:54 -0700403}
404
Gary Hadec04fc582009-01-06 14:39:14 -0800405static int __meminit __add_section(int nid, struct zone *zone,
406 unsigned long phys_start_pfn)
Dave Hansen3947be12005-10-29 18:16:54 -0700407{
Dave Hansen3947be12005-10-29 18:16:54 -0700408 int nr_pages = PAGES_PER_SECTION;
Dave Hansen3947be12005-10-29 18:16:54 -0700409 int ret;
410
KAMEZAWA Hiroyukiebd15302006-08-05 12:15:06 -0700411 if (pfn_valid(phys_start_pfn))
412 return -EEXIST;
413
Dave Hansen0b0acbe2005-10-29 18:16:55 -0700414 ret = sparse_add_one_section(zone, phys_start_pfn, nr_pages);
Dave Hansen3947be12005-10-29 18:16:54 -0700415
416 if (ret < 0)
417 return ret;
418
Yasunori Goto718127c2006-06-23 02:03:10 -0700419 ret = __add_zone(zone, phys_start_pfn);
420
421 if (ret < 0)
422 return ret;
423
Gary Hadec04fc582009-01-06 14:39:14 -0800424 return register_new_memory(nid, __pfn_to_section(phys_start_pfn));
Dave Hansen3947be12005-10-29 18:16:54 -0700425}
426
David Rientjes4edd7ce2013-04-29 15:08:22 -0700427/*
428 * Reasonably generic function for adding memory. It is
429 * expected that archs that support memory hotplug will
430 * call this function after deciding the zone to which to
431 * add the new pages.
432 */
433int __ref __add_pages(int nid, struct zone *zone, unsigned long phys_start_pfn,
434 unsigned long nr_pages)
435{
436 unsigned long i;
437 int err = 0;
438 int start_sec, end_sec;
439 /* during initialize mem_map, align hot-added range to section */
440 start_sec = pfn_to_section_nr(phys_start_pfn);
441 end_sec = pfn_to_section_nr(phys_start_pfn + nr_pages - 1);
442
443 for (i = start_sec; i <= end_sec; i++) {
444 err = __add_section(nid, zone, i << PFN_SECTION_SHIFT);
445
446 /*
447 * EEXIST is finally dealt with by ioresource collision
448 * check. see add_memory() => register_memory_resource()
449 * Warning will be printed if there is collision.
450 */
451 if (err && (err != -EEXIST))
452 break;
453 err = 0;
454 }
455
456 return err;
457}
458EXPORT_SYMBOL_GPL(__add_pages);
459
460#ifdef CONFIG_MEMORY_HOTREMOVE
Yasuaki Ishimatsu815121d2013-02-22 16:33:12 -0800461/* find the smallest valid pfn in the range [start_pfn, end_pfn) */
462static int find_smallest_section_pfn(int nid, struct zone *zone,
463 unsigned long start_pfn,
464 unsigned long end_pfn)
465{
466 struct mem_section *ms;
467
468 for (; start_pfn < end_pfn; start_pfn += PAGES_PER_SECTION) {
469 ms = __pfn_to_section(start_pfn);
470
471 if (unlikely(!valid_section(ms)))
472 continue;
473
474 if (unlikely(pfn_to_nid(start_pfn) != nid))
475 continue;
476
477 if (zone && zone != page_zone(pfn_to_page(start_pfn)))
478 continue;
479
480 return start_pfn;
481 }
482
483 return 0;
484}
485
486/* find the biggest valid pfn in the range [start_pfn, end_pfn). */
487static int find_biggest_section_pfn(int nid, struct zone *zone,
488 unsigned long start_pfn,
489 unsigned long end_pfn)
490{
491 struct mem_section *ms;
492 unsigned long pfn;
493
494 /* pfn is the end pfn of a memory section. */
495 pfn = end_pfn - 1;
496 for (; pfn >= start_pfn; pfn -= PAGES_PER_SECTION) {
497 ms = __pfn_to_section(pfn);
498
499 if (unlikely(!valid_section(ms)))
500 continue;
501
502 if (unlikely(pfn_to_nid(pfn) != nid))
503 continue;
504
505 if (zone && zone != page_zone(pfn_to_page(pfn)))
506 continue;
507
508 return pfn;
509 }
510
511 return 0;
512}
513
514static void shrink_zone_span(struct zone *zone, unsigned long start_pfn,
515 unsigned long end_pfn)
516{
517 unsigned long zone_start_pfn = zone->zone_start_pfn;
518 unsigned long zone_end_pfn = zone->zone_start_pfn + zone->spanned_pages;
519 unsigned long pfn;
520 struct mem_section *ms;
521 int nid = zone_to_nid(zone);
522
523 zone_span_writelock(zone);
524 if (zone_start_pfn == start_pfn) {
525 /*
526 * If the section is smallest section in the zone, it need
527 * shrink zone->zone_start_pfn and zone->zone_spanned_pages.
528 * In this case, we find second smallest valid mem_section
529 * for shrinking zone.
530 */
531 pfn = find_smallest_section_pfn(nid, zone, end_pfn,
532 zone_end_pfn);
533 if (pfn) {
534 zone->zone_start_pfn = pfn;
535 zone->spanned_pages = zone_end_pfn - pfn;
536 }
537 } else if (zone_end_pfn == end_pfn) {
538 /*
539 * If the section is biggest section in the zone, it need
540 * shrink zone->spanned_pages.
541 * In this case, we find second biggest valid mem_section for
542 * shrinking zone.
543 */
544 pfn = find_biggest_section_pfn(nid, zone, zone_start_pfn,
545 start_pfn);
546 if (pfn)
547 zone->spanned_pages = pfn - zone_start_pfn + 1;
548 }
549
550 /*
551 * The section is not biggest or smallest mem_section in the zone, it
552 * only creates a hole in the zone. So in this case, we need not
553 * change the zone. But perhaps, the zone has only hole data. Thus
554 * it check the zone has only hole or not.
555 */
556 pfn = zone_start_pfn;
557 for (; pfn < zone_end_pfn; pfn += PAGES_PER_SECTION) {
558 ms = __pfn_to_section(pfn);
559
560 if (unlikely(!valid_section(ms)))
561 continue;
562
563 if (page_zone(pfn_to_page(pfn)) != zone)
564 continue;
565
566 /* If the section is current section, it continues the loop */
567 if (start_pfn == pfn)
568 continue;
569
570 /* If we find valid section, we have nothing to do */
571 zone_span_writeunlock(zone);
572 return;
573 }
574
575 /* The zone has no valid section */
576 zone->zone_start_pfn = 0;
577 zone->spanned_pages = 0;
578 zone_span_writeunlock(zone);
579}
580
581static void shrink_pgdat_span(struct pglist_data *pgdat,
582 unsigned long start_pfn, unsigned long end_pfn)
583{
584 unsigned long pgdat_start_pfn = pgdat->node_start_pfn;
585 unsigned long pgdat_end_pfn =
586 pgdat->node_start_pfn + pgdat->node_spanned_pages;
587 unsigned long pfn;
588 struct mem_section *ms;
589 int nid = pgdat->node_id;
590
591 if (pgdat_start_pfn == start_pfn) {
592 /*
593 * If the section is smallest section in the pgdat, it need
594 * shrink pgdat->node_start_pfn and pgdat->node_spanned_pages.
595 * In this case, we find second smallest valid mem_section
596 * for shrinking zone.
597 */
598 pfn = find_smallest_section_pfn(nid, NULL, end_pfn,
599 pgdat_end_pfn);
600 if (pfn) {
601 pgdat->node_start_pfn = pfn;
602 pgdat->node_spanned_pages = pgdat_end_pfn - pfn;
603 }
604 } else if (pgdat_end_pfn == end_pfn) {
605 /*
606 * If the section is biggest section in the pgdat, it need
607 * shrink pgdat->node_spanned_pages.
608 * In this case, we find second biggest valid mem_section for
609 * shrinking zone.
610 */
611 pfn = find_biggest_section_pfn(nid, NULL, pgdat_start_pfn,
612 start_pfn);
613 if (pfn)
614 pgdat->node_spanned_pages = pfn - pgdat_start_pfn + 1;
615 }
616
617 /*
618 * If the section is not biggest or smallest mem_section in the pgdat,
619 * it only creates a hole in the pgdat. So in this case, we need not
620 * change the pgdat.
621 * But perhaps, the pgdat has only hole data. Thus it check the pgdat
622 * has only hole or not.
623 */
624 pfn = pgdat_start_pfn;
625 for (; pfn < pgdat_end_pfn; pfn += PAGES_PER_SECTION) {
626 ms = __pfn_to_section(pfn);
627
628 if (unlikely(!valid_section(ms)))
629 continue;
630
631 if (pfn_to_nid(pfn) != nid)
632 continue;
633
634 /* If the section is current section, it continues the loop */
635 if (start_pfn == pfn)
636 continue;
637
638 /* If we find valid section, we have nothing to do */
639 return;
640 }
641
642 /* The pgdat has no valid section */
643 pgdat->node_start_pfn = 0;
644 pgdat->node_spanned_pages = 0;
645}
646
647static void __remove_zone(struct zone *zone, unsigned long start_pfn)
648{
649 struct pglist_data *pgdat = zone->zone_pgdat;
650 int nr_pages = PAGES_PER_SECTION;
651 int zone_type;
652 unsigned long flags;
653
654 zone_type = zone - pgdat->node_zones;
655
656 pgdat_resize_lock(zone->zone_pgdat, &flags);
657 shrink_zone_span(zone, start_pfn, start_pfn + nr_pages);
658 shrink_pgdat_span(pgdat, start_pfn, start_pfn + nr_pages);
659 pgdat_resize_unlock(zone->zone_pgdat, &flags);
660}
661
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700662static int __remove_section(struct zone *zone, struct mem_section *ms)
663{
Yasuaki Ishimatsu815121d2013-02-22 16:33:12 -0800664 unsigned long start_pfn;
665 int scn_nr;
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700666 int ret = -EINVAL;
667
668 if (!valid_section(ms))
669 return ret;
670
671 ret = unregister_memory_section(ms);
672 if (ret)
673 return ret;
674
Yasuaki Ishimatsu815121d2013-02-22 16:33:12 -0800675 scn_nr = __section_nr(ms);
676 start_pfn = section_nr_to_pfn(scn_nr);
677 __remove_zone(zone, start_pfn);
678
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700679 sparse_remove_one_section(zone, ms);
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700680 return 0;
681}
682
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700683/**
684 * __remove_pages() - remove sections of pages from a zone
685 * @zone: zone from which pages need to be removed
686 * @phys_start_pfn: starting pageframe (must be aligned to start of a section)
687 * @nr_pages: number of pages to remove (must be multiple of section size)
688 *
689 * Generic helper function to remove section mappings and sysfs entries
690 * for the section of the memory we are removing. Caller needs to make
691 * sure that pages are marked reserved and zones are adjust properly by
692 * calling offline_pages().
693 */
694int __remove_pages(struct zone *zone, unsigned long phys_start_pfn,
695 unsigned long nr_pages)
696{
Toshi Kanife74ebb2013-04-29 15:08:20 -0700697 unsigned long i;
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700698 int sections_to_remove;
Toshi Kanife74ebb2013-04-29 15:08:20 -0700699 resource_size_t start, size;
700 int ret = 0;
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700701
702 /*
703 * We can only remove entire sections
704 */
705 BUG_ON(phys_start_pfn & ~PAGE_SECTION_MASK);
706 BUG_ON(nr_pages % PAGES_PER_SECTION);
707
Toshi Kanife74ebb2013-04-29 15:08:20 -0700708 start = phys_start_pfn << PAGE_SHIFT;
709 size = nr_pages * PAGE_SIZE;
710 ret = release_mem_region_adjustable(&iomem_resource, start, size);
Randy Dunlap348f9f02013-05-24 15:55:30 -0700711 if (ret) {
712 resource_size_t endres = start + size - 1;
713
714 pr_warn("Unable to release resource <%pa-%pa> (%d)\n",
715 &start, &endres, ret);
716 }
Yasuaki Ishimatsud760afd2012-10-08 16:34:14 -0700717
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700718 sections_to_remove = nr_pages / PAGES_PER_SECTION;
719 for (i = 0; i < sections_to_remove; i++) {
720 unsigned long pfn = phys_start_pfn + i*PAGES_PER_SECTION;
721 ret = __remove_section(zone, __pfn_to_section(pfn));
722 if (ret)
723 break;
724 }
725 return ret;
726}
727EXPORT_SYMBOL_GPL(__remove_pages);
David Rientjes4edd7ce2013-04-29 15:08:22 -0700728#endif /* CONFIG_MEMORY_HOTREMOVE */
Badari Pulavartyea01ea92008-04-28 02:12:01 -0700729
Daniel Kiper9d0ad8c2011-07-25 17:12:05 -0700730int 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}
745EXPORT_SYMBOL_GPL(set_online_page_callback);
746
747int 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}
762EXPORT_SYMBOL_GPL(restore_online_page_callback);
763
764void __online_page_set_limits(struct page *page)
Jeremy Fitzhardinge180c06e2008-04-28 02:12:03 -0700765{
Daniel Kiper9d0ad8c2011-07-25 17:12:05 -0700766}
767EXPORT_SYMBOL_GPL(__online_page_set_limits);
768
769void __online_page_increment_counters(struct page *page)
770{
Jiang Liu3dcc0572013-07-03 15:03:21 -0700771 adjust_managed_page_count(page, 1);
Daniel Kiper9d0ad8c2011-07-25 17:12:05 -0700772}
773EXPORT_SYMBOL_GPL(__online_page_increment_counters);
Jeremy Fitzhardinge180c06e2008-04-28 02:12:03 -0700774
Daniel Kiper9d0ad8c2011-07-25 17:12:05 -0700775void __online_page_free(struct page *page)
776{
Jiang Liu3dcc0572013-07-03 15:03:21 -0700777 __free_reserved_page(page);
Jeremy Fitzhardinge180c06e2008-04-28 02:12:03 -0700778}
Daniel Kiper9d0ad8c2011-07-25 17:12:05 -0700779EXPORT_SYMBOL_GPL(__online_page_free);
780
781static void generic_online_page(struct page *page)
782{
783 __online_page_set_limits(page);
784 __online_page_increment_counters(page);
785 __online_page_free(page);
786}
Jeremy Fitzhardinge180c06e2008-04-28 02:12:03 -0700787
KAMEZAWA Hiroyuki75884fb2007-10-16 01:26:10 -0700788static int online_pages_range(unsigned long start_pfn, unsigned long nr_pages,
789 void *arg)
Dave Hansen3947be12005-10-29 18:16:54 -0700790{
791 unsigned long i;
KAMEZAWA Hiroyuki75884fb2007-10-16 01:26:10 -0700792 unsigned long onlined_pages = *(unsigned long *)arg;
793 struct page *page;
794 if (PageReserved(pfn_to_page(start_pfn)))
795 for (i = 0; i < nr_pages; i++) {
796 page = pfn_to_page(start_pfn + i);
Daniel Kiper9d0ad8c2011-07-25 17:12:05 -0700797 (*online_page_callback)(page);
KAMEZAWA Hiroyuki75884fb2007-10-16 01:26:10 -0700798 onlined_pages++;
799 }
800 *(unsigned long *)arg = onlined_pages;
801 return 0;
802}
803
Lai Jiangshan09285af2012-12-12 13:52:04 -0800804#ifdef CONFIG_MOVABLE_NODE
Tang Chen79a4dce2012-12-18 14:23:24 -0800805/*
806 * When CONFIG_MOVABLE_NODE, we permit onlining of a node which doesn't have
807 * normal memory.
808 */
Lai Jiangshan09285af2012-12-12 13:52:04 -0800809static bool can_online_high_movable(struct zone *zone)
810{
811 return true;
812}
Tang Chen79a4dce2012-12-18 14:23:24 -0800813#else /* CONFIG_MOVABLE_NODE */
Lai Jiangshan74d42d82012-12-11 16:03:23 -0800814/* ensure every online node has NORMAL memory */
815static bool can_online_high_movable(struct zone *zone)
816{
817 return node_state(zone_to_nid(zone), N_NORMAL_MEMORY);
818}
Tang Chen79a4dce2012-12-18 14:23:24 -0800819#endif /* CONFIG_MOVABLE_NODE */
Lai Jiangshan74d42d82012-12-11 16:03:23 -0800820
Lai Jiangshand9713672012-12-11 16:01:03 -0800821/* check which state of node_states will be changed when online memory */
822static void node_states_check_changes_online(unsigned long nr_pages,
823 struct zone *zone, struct memory_notify *arg)
824{
825 int nid = zone_to_nid(zone);
826 enum zone_type zone_last = ZONE_NORMAL;
827
828 /*
Lai Jiangshan6715ddf2012-12-12 13:51:49 -0800829 * If we have HIGHMEM or movable node, node_states[N_NORMAL_MEMORY]
830 * contains nodes which have zones of 0...ZONE_NORMAL,
831 * set zone_last to ZONE_NORMAL.
Lai Jiangshand9713672012-12-11 16:01:03 -0800832 *
Lai Jiangshan6715ddf2012-12-12 13:51:49 -0800833 * If we don't have HIGHMEM nor movable node,
834 * node_states[N_NORMAL_MEMORY] contains nodes which have zones of
835 * 0...ZONE_MOVABLE, set zone_last to ZONE_MOVABLE.
Lai Jiangshand9713672012-12-11 16:01:03 -0800836 */
Lai Jiangshan6715ddf2012-12-12 13:51:49 -0800837 if (N_MEMORY == N_NORMAL_MEMORY)
Lai Jiangshand9713672012-12-11 16:01:03 -0800838 zone_last = ZONE_MOVABLE;
839
840 /*
841 * if the memory to be online is in a zone of 0...zone_last, and
842 * the zones of 0...zone_last don't have memory before online, we will
843 * need to set the node to node_states[N_NORMAL_MEMORY] after
844 * the memory is online.
845 */
846 if (zone_idx(zone) <= zone_last && !node_state(nid, N_NORMAL_MEMORY))
847 arg->status_change_nid_normal = nid;
848 else
849 arg->status_change_nid_normal = -1;
850
Lai Jiangshan6715ddf2012-12-12 13:51:49 -0800851#ifdef CONFIG_HIGHMEM
852 /*
853 * If we have movable node, node_states[N_HIGH_MEMORY]
854 * contains nodes which have zones of 0...ZONE_HIGHMEM,
855 * set zone_last to ZONE_HIGHMEM.
856 *
857 * If we don't have movable node, node_states[N_NORMAL_MEMORY]
858 * contains nodes which have zones of 0...ZONE_MOVABLE,
859 * set zone_last to ZONE_MOVABLE.
860 */
861 zone_last = ZONE_HIGHMEM;
862 if (N_MEMORY == N_HIGH_MEMORY)
863 zone_last = ZONE_MOVABLE;
864
865 if (zone_idx(zone) <= zone_last && !node_state(nid, N_HIGH_MEMORY))
866 arg->status_change_nid_high = nid;
867 else
868 arg->status_change_nid_high = -1;
869#else
870 arg->status_change_nid_high = arg->status_change_nid_normal;
871#endif
872
Lai Jiangshand9713672012-12-11 16:01:03 -0800873 /*
874 * if the node don't have memory befor online, we will need to
Lai Jiangshan6715ddf2012-12-12 13:51:49 -0800875 * set the node to node_states[N_MEMORY] after the memory
Lai Jiangshand9713672012-12-11 16:01:03 -0800876 * is online.
877 */
Lai Jiangshan6715ddf2012-12-12 13:51:49 -0800878 if (!node_state(nid, N_MEMORY))
Lai Jiangshand9713672012-12-11 16:01:03 -0800879 arg->status_change_nid = nid;
880 else
881 arg->status_change_nid = -1;
882}
883
884static void node_states_set_node(int node, struct memory_notify *arg)
885{
886 if (arg->status_change_nid_normal >= 0)
887 node_set_state(node, N_NORMAL_MEMORY);
888
Lai Jiangshan6715ddf2012-12-12 13:51:49 -0800889 if (arg->status_change_nid_high >= 0)
890 node_set_state(node, N_HIGH_MEMORY);
891
892 node_set_state(node, N_MEMORY);
Lai Jiangshand9713672012-12-11 16:01:03 -0800893}
894
KAMEZAWA Hiroyuki75884fb2007-10-16 01:26:10 -0700895
Lai Jiangshan511c2ab2012-12-11 16:03:16 -0800896int __ref online_pages(unsigned long pfn, unsigned long nr_pages, int online_type)
KAMEZAWA Hiroyuki75884fb2007-10-16 01:26:10 -0700897{
Cody P Schaferaa472282013-07-03 15:02:10 -0700898 unsigned long flags;
Dave Hansen3947be12005-10-29 18:16:54 -0700899 unsigned long onlined_pages = 0;
900 struct zone *zone;
Yasunori Goto68113782006-06-23 02:03:11 -0700901 int need_zonelists_rebuild = 0;
Yasunori Goto7b78d332007-10-21 16:41:36 -0700902 int nid;
903 int ret;
904 struct memory_notify arg;
Dave Hansen3947be12005-10-29 18:16:54 -0700905
KAMEZAWA Hiroyuki925268a2011-01-11 16:44:01 +0900906 lock_memory_hotplug();
Lai Jiangshand9713672012-12-11 16:01:03 -0800907 /*
908 * This doesn't need a lock to do pfn_to_page().
909 * The section can't be removed here because of the
910 * memory_block->state_mutex.
911 */
912 zone = page_zone(pfn_to_page(pfn));
913
Lai Jiangshan74d42d82012-12-11 16:03:23 -0800914 if ((zone_idx(zone) > ZONE_NORMAL || online_type == ONLINE_MOVABLE) &&
915 !can_online_high_movable(zone)) {
916 unlock_memory_hotplug();
Toshi Kani0a1be152013-07-08 16:00:41 -0700917 return -EINVAL;
Lai Jiangshan74d42d82012-12-11 16:03:23 -0800918 }
919
Lai Jiangshan511c2ab2012-12-11 16:03:16 -0800920 if (online_type == ONLINE_KERNEL && zone_idx(zone) == ZONE_MOVABLE) {
921 if (move_pfn_range_left(zone - 1, zone, pfn, pfn + nr_pages)) {
922 unlock_memory_hotplug();
Toshi Kani0a1be152013-07-08 16:00:41 -0700923 return -EINVAL;
Lai Jiangshan511c2ab2012-12-11 16:03:16 -0800924 }
925 }
926 if (online_type == ONLINE_MOVABLE && zone_idx(zone) == ZONE_MOVABLE - 1) {
927 if (move_pfn_range_right(zone, zone + 1, pfn, pfn + nr_pages)) {
928 unlock_memory_hotplug();
Toshi Kani0a1be152013-07-08 16:00:41 -0700929 return -EINVAL;
Lai Jiangshan511c2ab2012-12-11 16:03:16 -0800930 }
931 }
932
933 /* Previous code may changed the zone of the pfn range */
934 zone = page_zone(pfn_to_page(pfn));
935
Yasunori Goto7b78d332007-10-21 16:41:36 -0700936 arg.start_pfn = pfn;
937 arg.nr_pages = nr_pages;
Lai Jiangshand9713672012-12-11 16:01:03 -0800938 node_states_check_changes_online(nr_pages, zone, &arg);
Yasunori Goto7b78d332007-10-21 16:41:36 -0700939
940 nid = page_to_nid(pfn_to_page(pfn));
Yasunori Goto7b78d332007-10-21 16:41:36 -0700941
942 ret = memory_notify(MEM_GOING_ONLINE, &arg);
943 ret = notifier_to_errno(ret);
944 if (ret) {
945 memory_notify(MEM_CANCEL_ONLINE, &arg);
KAMEZAWA Hiroyuki925268a2011-01-11 16:44:01 +0900946 unlock_memory_hotplug();
Yasunori Goto7b78d332007-10-21 16:41:36 -0700947 return ret;
948 }
Dave Hansen3947be12005-10-29 18:16:54 -0700949 /*
Yasunori Goto68113782006-06-23 02:03:11 -0700950 * If this zone is not populated, then it is not in zonelist.
951 * This means the page allocator ignores this zone.
952 * So, zonelist must be updated after online.
953 */
Haicheng Li4eaf3f62010-05-24 14:32:52 -0700954 mutex_lock(&zonelists_mutex);
Wen Congyang6dcd73d2012-12-11 16:01:01 -0800955 if (!populated_zone(zone)) {
Yasunori Goto68113782006-06-23 02:03:11 -0700956 need_zonelists_rebuild = 1;
Wen Congyang6dcd73d2012-12-11 16:01:01 -0800957 build_all_zonelists(NULL, zone);
958 }
Yasunori Goto68113782006-06-23 02:03:11 -0700959
KAMEZAWA Hiroyuki908eedc2009-09-22 16:45:46 -0700960 ret = walk_system_ram_range(pfn, nr_pages, &onlined_pages,
KAMEZAWA Hiroyuki75884fb2007-10-16 01:26:10 -0700961 online_pages_range);
Geoff Levandfd8a4222008-05-14 16:05:50 -0700962 if (ret) {
Wen Congyang6dcd73d2012-12-11 16:01:01 -0800963 if (need_zonelists_rebuild)
964 zone_pcp_reset(zone);
Haicheng Li4eaf3f62010-05-24 14:32:52 -0700965 mutex_unlock(&zonelists_mutex);
Bjorn Helgaasa62e2f42012-05-29 15:06:30 -0700966 printk(KERN_DEBUG "online_pages [mem %#010llx-%#010llx] failed\n",
967 (unsigned long long) pfn << PAGE_SHIFT,
968 (((unsigned long long) pfn + nr_pages)
969 << PAGE_SHIFT) - 1);
Geoff Levandfd8a4222008-05-14 16:05:50 -0700970 memory_notify(MEM_CANCEL_ONLINE, &arg);
KAMEZAWA Hiroyuki925268a2011-01-11 16:44:01 +0900971 unlock_memory_hotplug();
Geoff Levandfd8a4222008-05-14 16:05:50 -0700972 return ret;
973 }
974
Dave Hansen3947be12005-10-29 18:16:54 -0700975 zone->present_pages += onlined_pages;
Cody P Schaferaa472282013-07-03 15:02:10 -0700976
977 pgdat_resize_lock(zone->zone_pgdat, &flags);
Yasunori Gotof2937be2006-03-09 17:33:51 -0800978 zone->zone_pgdat->node_present_pages += onlined_pages;
Cody P Schaferaa472282013-07-03 15:02:10 -0700979 pgdat_resize_unlock(zone->zone_pgdat, &flags);
980
Jiang Liu08dff7b2012-07-31 16:43:30 -0700981 if (onlined_pages) {
Lai Jiangshand9713672012-12-11 16:01:03 -0800982 node_states_set_node(zone_to_nid(zone), &arg);
Jiang Liu08dff7b2012-07-31 16:43:30 -0700983 if (need_zonelists_rebuild)
Wen Congyang6dcd73d2012-12-11 16:01:01 -0800984 build_all_zonelists(NULL, NULL);
Jiang Liu08dff7b2012-07-31 16:43:30 -0700985 else
986 zone_pcp_update(zone);
987 }
Dave Hansen3947be12005-10-29 18:16:54 -0700988
Haicheng Li4eaf3f62010-05-24 14:32:52 -0700989 mutex_unlock(&zonelists_mutex);
KOSAKI Motohiro1b79acc2011-05-24 17:11:32 -0700990
991 init_per_zone_wmark_min();
992
Jiang Liu08dff7b2012-07-31 16:43:30 -0700993 if (onlined_pages)
Christoph Lameter7ea15302007-10-16 01:25:29 -0700994 kswapd_run(zone_to_nid(zone));
Dave Hansen61b13992005-10-29 18:16:56 -0700995
Haicheng Li1f522502010-05-24 14:32:51 -0700996 vm_total_pages = nr_free_pagecache_pages();
Kent Liu2f7f24e2008-07-23 21:28:18 -0700997
Chandra Seetharaman2d1d43f2006-09-29 02:01:25 -0700998 writeback_set_ratelimit();
Yasunori Goto7b78d332007-10-21 16:41:36 -0700999
1000 if (onlined_pages)
1001 memory_notify(MEM_ONLINE, &arg);
KAMEZAWA Hiroyuki925268a2011-01-11 16:44:01 +09001002 unlock_memory_hotplug();
Yasunori Goto7b78d332007-10-21 16:41:36 -07001003
Dave Hansen3947be12005-10-29 18:16:54 -07001004 return 0;
1005}
Keith Mannthey53947022006-09-30 23:27:08 -07001006#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
Yasunori Gotobc02af92006-06-27 02:53:30 -07001007
Hidetoshi Setoe1319332009-11-17 14:06:18 -08001008/* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */
1009static pg_data_t __ref *hotadd_new_pgdat(int nid, u64 start)
Yasunori Goto9af3c2d2006-06-27 02:53:34 -07001010{
1011 struct pglist_data *pgdat;
1012 unsigned long zones_size[MAX_NR_ZONES] = {0};
1013 unsigned long zholes_size[MAX_NR_ZONES] = {0};
1014 unsigned long start_pfn = start >> PAGE_SHIFT;
1015
Tang Chena1e565a2013-02-22 16:33:18 -08001016 pgdat = NODE_DATA(nid);
1017 if (!pgdat) {
1018 pgdat = arch_alloc_nodedata(nid);
1019 if (!pgdat)
1020 return NULL;
Yasunori Goto9af3c2d2006-06-27 02:53:34 -07001021
Tang Chena1e565a2013-02-22 16:33:18 -08001022 arch_refresh_nodedata(nid, pgdat);
1023 }
Yasunori Goto9af3c2d2006-06-27 02:53:34 -07001024
1025 /* we can use NODE_DATA(nid) from here */
1026
1027 /* init node's zones as empty zones, we don't have any present pages.*/
Johannes Weiner9109fb72008-07-23 21:27:20 -07001028 free_area_init_node(nid, zones_size, start_pfn, zholes_size);
Yasunori Goto9af3c2d2006-06-27 02:53:34 -07001029
KAMEZAWA Hiroyuki959ecc42011-06-15 15:08:38 -07001030 /*
1031 * The node we allocated has no zone fallback lists. For avoiding
1032 * to access not-initialized zonelist, build here.
1033 */
David Rientjesf957db42011-06-22 18:13:04 -07001034 mutex_lock(&zonelists_mutex);
Jiang Liu9adb62a2012-07-31 16:43:28 -07001035 build_all_zonelists(pgdat, NULL);
David Rientjesf957db42011-06-22 18:13:04 -07001036 mutex_unlock(&zonelists_mutex);
KAMEZAWA Hiroyuki959ecc42011-06-15 15:08:38 -07001037
Yasunori Goto9af3c2d2006-06-27 02:53:34 -07001038 return pgdat;
1039}
1040
1041static void rollback_node_hotadd(int nid, pg_data_t *pgdat)
1042{
1043 arch_refresh_nodedata(nid, NULL);
1044 arch_free_nodedata(pgdat);
1045 return;
1046}
1047
KAMEZAWA Hiroyuki0a547032006-06-27 02:53:35 -07001048
minskey guocf234222010-05-24 14:32:41 -07001049/*
1050 * called by cpu_up() to online a node without onlined memory.
1051 */
1052int mem_online_node(int nid)
1053{
1054 pg_data_t *pgdat;
1055 int ret;
1056
KOSAKI Motohiro20d6c962010-12-02 14:31:19 -08001057 lock_memory_hotplug();
minskey guocf234222010-05-24 14:32:41 -07001058 pgdat = hotadd_new_pgdat(nid, 0);
David Rientjes7553e8f2011-06-22 18:13:01 -07001059 if (!pgdat) {
minskey guocf234222010-05-24 14:32:41 -07001060 ret = -ENOMEM;
1061 goto out;
1062 }
1063 node_set_online(nid);
1064 ret = register_one_node(nid);
1065 BUG_ON(ret);
1066
1067out:
KOSAKI Motohiro20d6c962010-12-02 14:31:19 -08001068 unlock_memory_hotplug();
minskey guocf234222010-05-24 14:32:41 -07001069 return ret;
1070}
1071
Al Viro31168482008-11-22 17:33:24 +00001072/* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */
1073int __ref add_memory(int nid, u64 start, u64 size)
Yasunori Gotobc02af92006-06-27 02:53:30 -07001074{
Yasunori Goto9af3c2d2006-06-27 02:53:34 -07001075 pg_data_t *pgdat = NULL;
Tang Chena1e565a2013-02-22 16:33:18 -08001076 bool new_pgdat;
1077 bool new_node;
KAMEZAWA Hiroyukiebd15302006-08-05 12:15:06 -07001078 struct resource *res;
Yasunori Gotobc02af92006-06-27 02:53:30 -07001079 int ret;
1080
KOSAKI Motohiro20d6c962010-12-02 14:31:19 -08001081 lock_memory_hotplug();
Andi Kleen6ad696d2009-11-17 14:06:22 -08001082
KAMEZAWA Hiroyukiebd15302006-08-05 12:15:06 -07001083 res = register_memory_resource(start, size);
Andi Kleen6ad696d2009-11-17 14:06:22 -08001084 ret = -EEXIST;
KAMEZAWA Hiroyukiebd15302006-08-05 12:15:06 -07001085 if (!res)
Andi Kleen6ad696d2009-11-17 14:06:22 -08001086 goto out;
KAMEZAWA Hiroyukiebd15302006-08-05 12:15:06 -07001087
Tang Chena1e565a2013-02-22 16:33:18 -08001088 { /* Stupid hack to suppress address-never-null warning */
1089 void *p = NODE_DATA(nid);
1090 new_pgdat = !p;
1091 }
1092 new_node = !node_online(nid);
1093 if (new_node) {
Yasunori Goto9af3c2d2006-06-27 02:53:34 -07001094 pgdat = hotadd_new_pgdat(nid, start);
Andi Kleen6ad696d2009-11-17 14:06:22 -08001095 ret = -ENOMEM;
Yasunori Goto9af3c2d2006-06-27 02:53:34 -07001096 if (!pgdat)
Wen Congyang41b9e2d2012-07-11 14:02:31 -07001097 goto error;
Yasunori Goto9af3c2d2006-06-27 02:53:34 -07001098 }
1099
Yasunori Gotobc02af92006-06-27 02:53:30 -07001100 /* call arch's memory hotadd */
1101 ret = arch_add_memory(nid, start, size);
1102
Yasunori Goto9af3c2d2006-06-27 02:53:34 -07001103 if (ret < 0)
1104 goto error;
1105
Yasunori Goto0fc44152006-06-27 02:53:38 -07001106 /* we online node here. we can't roll back from here. */
Yasunori Goto9af3c2d2006-06-27 02:53:34 -07001107 node_set_online(nid);
1108
Tang Chena1e565a2013-02-22 16:33:18 -08001109 if (new_node) {
Yasunori Goto0fc44152006-06-27 02:53:38 -07001110 ret = register_one_node(nid);
1111 /*
1112 * If sysfs file of new node can't create, cpu on the node
1113 * can't be hot-added. There is no rollback way now.
1114 * So, check by BUG_ON() to catch it reluctantly..
1115 */
1116 BUG_ON(ret);
1117 }
1118
akpm@linux-foundation.orgd96ae532010-03-05 13:41:58 -08001119 /* create new memmap entry */
1120 firmware_map_add_hotplug(start, start + size, "System RAM");
1121
Andi Kleen6ad696d2009-11-17 14:06:22 -08001122 goto out;
1123
Yasunori Goto9af3c2d2006-06-27 02:53:34 -07001124error:
1125 /* rollback pgdat allocation and others */
1126 if (new_pgdat)
1127 rollback_node_hotadd(nid, pgdat);
Sasha Levina864b9d2013-02-22 16:32:48 -08001128 release_memory_resource(res);
Yasunori Goto9af3c2d2006-06-27 02:53:34 -07001129
Andi Kleen6ad696d2009-11-17 14:06:22 -08001130out:
KOSAKI Motohiro20d6c962010-12-02 14:31:19 -08001131 unlock_memory_hotplug();
Yasunori Gotobc02af92006-06-27 02:53:30 -07001132 return ret;
1133}
1134EXPORT_SYMBOL_GPL(add_memory);
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001135
1136#ifdef CONFIG_MEMORY_HOTREMOVE
1137/*
Badari Pulavarty5c755e92008-07-23 21:28:19 -07001138 * A free page on the buddy free lists (not the per-cpu lists) has PageBuddy
1139 * set and the size of the free page is given by page_order(). Using this,
1140 * the function determines if the pageblock contains only free pages.
1141 * Due to buddy contraints, a free page at least the size of a pageblock will
1142 * be located at the start of the pageblock
1143 */
1144static inline int pageblock_free(struct page *page)
1145{
1146 return PageBuddy(page) && page_order(page) >= pageblock_order;
1147}
1148
1149/* Return the start of the next active pageblock after a given page */
1150static struct page *next_active_pageblock(struct page *page)
1151{
Badari Pulavarty5c755e92008-07-23 21:28:19 -07001152 /* Ensure the starting page is pageblock-aligned */
1153 BUG_ON(page_to_pfn(page) & (pageblock_nr_pages - 1));
1154
Badari Pulavarty5c755e92008-07-23 21:28:19 -07001155 /* If the entire pageblock is free, move to the end of free page */
KAMEZAWA Hiroyuki0dcc48c2010-09-09 16:38:01 -07001156 if (pageblock_free(page)) {
1157 int order;
1158 /* be careful. we don't have locks, page_order can be changed.*/
1159 order = page_order(page);
1160 if ((order < MAX_ORDER) && (order >= pageblock_order))
1161 return page + (1 << order);
1162 }
Badari Pulavarty5c755e92008-07-23 21:28:19 -07001163
KAMEZAWA Hiroyuki0dcc48c2010-09-09 16:38:01 -07001164 return page + pageblock_nr_pages;
Badari Pulavarty5c755e92008-07-23 21:28:19 -07001165}
1166
1167/* Checks if this range of memory is likely to be hot-removable. */
1168int is_mem_section_removable(unsigned long start_pfn, unsigned long nr_pages)
1169{
Badari Pulavarty5c755e92008-07-23 21:28:19 -07001170 struct page *page = pfn_to_page(start_pfn);
1171 struct page *end_page = page + nr_pages;
1172
1173 /* Check the starting page of each pageblock within the range */
1174 for (; page < end_page; page = next_active_pageblock(page)) {
KAMEZAWA Hiroyuki49ac8252010-10-26 14:21:30 -07001175 if (!is_pageblock_removable_nolock(page))
Badari Pulavarty5c755e92008-07-23 21:28:19 -07001176 return 0;
KAMEZAWA Hiroyuki49ac8252010-10-26 14:21:30 -07001177 cond_resched();
Badari Pulavarty5c755e92008-07-23 21:28:19 -07001178 }
1179
1180 /* All pageblocks in the memory block are likely to be hot-removable */
1181 return 1;
1182}
1183
1184/*
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001185 * Confirm all pages in a range [start, end) is belongs to the same zone.
1186 */
1187static int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn)
1188{
1189 unsigned long pfn;
1190 struct zone *zone = NULL;
1191 struct page *page;
1192 int i;
1193 for (pfn = start_pfn;
1194 pfn < end_pfn;
1195 pfn += MAX_ORDER_NR_PAGES) {
1196 i = 0;
1197 /* This is just a CONFIG_HOLES_IN_ZONE check.*/
1198 while ((i < MAX_ORDER_NR_PAGES) && !pfn_valid_within(pfn + i))
1199 i++;
1200 if (i == MAX_ORDER_NR_PAGES)
1201 continue;
1202 page = pfn_to_page(pfn + i);
1203 if (zone && page_zone(page) != zone)
1204 return 0;
1205 zone = page_zone(page);
1206 }
1207 return 1;
1208}
1209
1210/*
1211 * Scanning pfn is much easier than scanning lru list.
1212 * Scan pfn from start to end and Find LRU page.
1213 */
Andrew Morton7bbc0902010-10-26 14:22:05 -07001214static unsigned long scan_lru_pages(unsigned long start, unsigned long end)
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001215{
1216 unsigned long pfn;
1217 struct page *page;
1218 for (pfn = start; pfn < end; pfn++) {
1219 if (pfn_valid(pfn)) {
1220 page = pfn_to_page(pfn);
1221 if (PageLRU(page))
1222 return pfn;
1223 }
1224 }
1225 return 0;
1226}
1227
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001228#define NR_OFFLINE_AT_ONCE_PAGES (256)
1229static int
1230do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
1231{
1232 unsigned long pfn;
1233 struct page *page;
1234 int move_pages = NR_OFFLINE_AT_ONCE_PAGES;
1235 int not_managed = 0;
1236 int ret = 0;
1237 LIST_HEAD(source);
1238
1239 for (pfn = start_pfn; pfn < end_pfn && move_pages > 0; pfn++) {
1240 if (!pfn_valid(pfn))
1241 continue;
1242 page = pfn_to_page(pfn);
Konstantin Khlebnikov700c2a42011-05-24 17:12:19 -07001243 if (!get_page_unless_zero(page))
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001244 continue;
1245 /*
1246 * We can skip free pages. And we can only deal with pages on
1247 * LRU.
1248 */
Nick Piggin62695a82008-10-18 20:26:09 -07001249 ret = isolate_lru_page(page);
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001250 if (!ret) { /* Success */
Konstantin Khlebnikov700c2a42011-05-24 17:12:19 -07001251 put_page(page);
Nick Piggin62695a82008-10-18 20:26:09 -07001252 list_add_tail(&page->lru, &source);
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001253 move_pages--;
KOSAKI Motohiro6d9c2852009-12-14 17:58:11 -08001254 inc_zone_page_state(page, NR_ISOLATED_ANON +
1255 page_is_file_cache(page));
1256
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001257 } else {
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001258#ifdef CONFIG_DEBUG_VM
Wu Fengguang718a3822010-03-10 15:20:43 -08001259 printk(KERN_ALERT "removing pfn %lx from LRU failed\n",
1260 pfn);
1261 dump_page(page);
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001262#endif
Konstantin Khlebnikov700c2a42011-05-24 17:12:19 -07001263 put_page(page);
Lucas De Marchi25985ed2011-03-30 22:57:33 -03001264 /* Because we don't have big zone->lock. we should
Bob Liu809c4442010-10-26 14:22:10 -07001265 check this again here. */
1266 if (page_count(page)) {
1267 not_managed++;
Bob Liuf3ab2632010-10-26 14:22:10 -07001268 ret = -EBUSY;
Bob Liu809c4442010-10-26 14:22:10 -07001269 break;
1270 }
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001271 }
1272 }
Bob Liuf3ab2632010-10-26 14:22:10 -07001273 if (!list_empty(&source)) {
1274 if (not_managed) {
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001275 putback_lru_pages(&source);
Bob Liuf3ab2632010-10-26 14:22:10 -07001276 goto out;
1277 }
Minchan Kim74c08f92012-10-08 16:32:54 -07001278
1279 /*
1280 * alloc_migrate_target should be improooooved!!
1281 * migrate_pages returns # of failed pages.
1282 */
1283 ret = migrate_pages(&source, alloc_migrate_target, 0,
Hugh Dickins9c620e22013-02-22 16:35:14 -08001284 MIGRATE_SYNC, MR_MEMORY_HOTPLUG);
Bob Liuf3ab2632010-10-26 14:22:10 -07001285 if (ret)
1286 putback_lru_pages(&source);
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001287 }
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001288out:
1289 return ret;
1290}
1291
1292/*
1293 * remove from free_area[] and mark all as Reserved.
1294 */
1295static int
1296offline_isolated_pages_cb(unsigned long start, unsigned long nr_pages,
1297 void *data)
1298{
1299 __offline_isolated_pages(start, start + nr_pages);
1300 return 0;
1301}
1302
1303static void
1304offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn)
1305{
KAMEZAWA Hiroyuki908eedc2009-09-22 16:45:46 -07001306 walk_system_ram_range(start_pfn, end_pfn - start_pfn, NULL,
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001307 offline_isolated_pages_cb);
1308}
1309
1310/*
1311 * Check all pages in range, recoreded as memory resource, are isolated.
1312 */
1313static int
1314check_pages_isolated_cb(unsigned long start_pfn, unsigned long nr_pages,
1315 void *data)
1316{
1317 int ret;
1318 long offlined = *(long *)data;
Wen Congyangb023f462012-12-11 16:00:45 -08001319 ret = test_pages_isolated(start_pfn, start_pfn + nr_pages, true);
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001320 offlined = nr_pages;
1321 if (!ret)
1322 *(long *)data += offlined;
1323 return ret;
1324}
1325
1326static long
1327check_pages_isolated(unsigned long start_pfn, unsigned long end_pfn)
1328{
1329 long offlined = 0;
1330 int ret;
1331
KAMEZAWA Hiroyuki908eedc2009-09-22 16:45:46 -07001332 ret = walk_system_ram_range(start_pfn, end_pfn - start_pfn, &offlined,
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001333 check_pages_isolated_cb);
1334 if (ret < 0)
1335 offlined = (long)ret;
1336 return offlined;
1337}
1338
Lai Jiangshan09285af2012-12-12 13:52:04 -08001339#ifdef CONFIG_MOVABLE_NODE
Tang Chen79a4dce2012-12-18 14:23:24 -08001340/*
1341 * When CONFIG_MOVABLE_NODE, we permit offlining of a node which doesn't have
1342 * normal memory.
1343 */
Lai Jiangshan09285af2012-12-12 13:52:04 -08001344static bool can_offline_normal(struct zone *zone, unsigned long nr_pages)
1345{
1346 return true;
1347}
Tang Chen79a4dce2012-12-18 14:23:24 -08001348#else /* CONFIG_MOVABLE_NODE */
Lai Jiangshan74d42d82012-12-11 16:03:23 -08001349/* ensure the node has NORMAL memory if it is still online */
1350static bool can_offline_normal(struct zone *zone, unsigned long nr_pages)
1351{
1352 struct pglist_data *pgdat = zone->zone_pgdat;
1353 unsigned long present_pages = 0;
1354 enum zone_type zt;
1355
1356 for (zt = 0; zt <= ZONE_NORMAL; zt++)
1357 present_pages += pgdat->node_zones[zt].present_pages;
1358
1359 if (present_pages > nr_pages)
1360 return true;
1361
1362 present_pages = 0;
1363 for (; zt <= ZONE_MOVABLE; zt++)
1364 present_pages += pgdat->node_zones[zt].present_pages;
1365
1366 /*
1367 * we can't offline the last normal memory until all
1368 * higher memory is offlined.
1369 */
1370 return present_pages == 0;
1371}
Tang Chen79a4dce2012-12-18 14:23:24 -08001372#endif /* CONFIG_MOVABLE_NODE */
Lai Jiangshan74d42d82012-12-11 16:03:23 -08001373
Lai Jiangshand9713672012-12-11 16:01:03 -08001374/* check which state of node_states will be changed when offline memory */
1375static void node_states_check_changes_offline(unsigned long nr_pages,
1376 struct zone *zone, struct memory_notify *arg)
1377{
1378 struct pglist_data *pgdat = zone->zone_pgdat;
1379 unsigned long present_pages = 0;
1380 enum zone_type zt, zone_last = ZONE_NORMAL;
1381
1382 /*
Lai Jiangshan6715ddf2012-12-12 13:51:49 -08001383 * If we have HIGHMEM or movable node, node_states[N_NORMAL_MEMORY]
1384 * contains nodes which have zones of 0...ZONE_NORMAL,
1385 * set zone_last to ZONE_NORMAL.
Lai Jiangshand9713672012-12-11 16:01:03 -08001386 *
Lai Jiangshan6715ddf2012-12-12 13:51:49 -08001387 * If we don't have HIGHMEM nor movable node,
1388 * node_states[N_NORMAL_MEMORY] contains nodes which have zones of
1389 * 0...ZONE_MOVABLE, set zone_last to ZONE_MOVABLE.
Lai Jiangshand9713672012-12-11 16:01:03 -08001390 */
Lai Jiangshan6715ddf2012-12-12 13:51:49 -08001391 if (N_MEMORY == N_NORMAL_MEMORY)
Lai Jiangshand9713672012-12-11 16:01:03 -08001392 zone_last = ZONE_MOVABLE;
1393
1394 /*
1395 * check whether node_states[N_NORMAL_MEMORY] will be changed.
1396 * If the memory to be offline is in a zone of 0...zone_last,
1397 * and it is the last present memory, 0...zone_last will
1398 * become empty after offline , thus we can determind we will
1399 * need to clear the node from node_states[N_NORMAL_MEMORY].
1400 */
1401 for (zt = 0; zt <= zone_last; zt++)
1402 present_pages += pgdat->node_zones[zt].present_pages;
1403 if (zone_idx(zone) <= zone_last && nr_pages >= present_pages)
1404 arg->status_change_nid_normal = zone_to_nid(zone);
1405 else
1406 arg->status_change_nid_normal = -1;
1407
Lai Jiangshan6715ddf2012-12-12 13:51:49 -08001408#ifdef CONFIG_HIGHMEM
1409 /*
1410 * If we have movable node, node_states[N_HIGH_MEMORY]
1411 * contains nodes which have zones of 0...ZONE_HIGHMEM,
1412 * set zone_last to ZONE_HIGHMEM.
1413 *
1414 * If we don't have movable node, node_states[N_NORMAL_MEMORY]
1415 * contains nodes which have zones of 0...ZONE_MOVABLE,
1416 * set zone_last to ZONE_MOVABLE.
1417 */
1418 zone_last = ZONE_HIGHMEM;
1419 if (N_MEMORY == N_HIGH_MEMORY)
1420 zone_last = ZONE_MOVABLE;
1421
1422 for (; zt <= zone_last; zt++)
1423 present_pages += pgdat->node_zones[zt].present_pages;
1424 if (zone_idx(zone) <= zone_last && nr_pages >= present_pages)
1425 arg->status_change_nid_high = zone_to_nid(zone);
1426 else
1427 arg->status_change_nid_high = -1;
1428#else
1429 arg->status_change_nid_high = arg->status_change_nid_normal;
1430#endif
1431
Lai Jiangshand9713672012-12-11 16:01:03 -08001432 /*
1433 * node_states[N_HIGH_MEMORY] contains nodes which have 0...ZONE_MOVABLE
1434 */
1435 zone_last = ZONE_MOVABLE;
1436
1437 /*
1438 * check whether node_states[N_HIGH_MEMORY] will be changed
1439 * If we try to offline the last present @nr_pages from the node,
1440 * we can determind we will need to clear the node from
1441 * node_states[N_HIGH_MEMORY].
1442 */
1443 for (; zt <= zone_last; zt++)
1444 present_pages += pgdat->node_zones[zt].present_pages;
1445 if (nr_pages >= present_pages)
1446 arg->status_change_nid = zone_to_nid(zone);
1447 else
1448 arg->status_change_nid = -1;
1449}
1450
1451static void node_states_clear_node(int node, struct memory_notify *arg)
1452{
1453 if (arg->status_change_nid_normal >= 0)
1454 node_clear_state(node, N_NORMAL_MEMORY);
1455
Lai Jiangshan6715ddf2012-12-12 13:51:49 -08001456 if ((N_MEMORY != N_NORMAL_MEMORY) &&
1457 (arg->status_change_nid_high >= 0))
Lai Jiangshand9713672012-12-11 16:01:03 -08001458 node_clear_state(node, N_HIGH_MEMORY);
Lai Jiangshan6715ddf2012-12-12 13:51:49 -08001459
1460 if ((N_MEMORY != N_HIGH_MEMORY) &&
1461 (arg->status_change_nid >= 0))
1462 node_clear_state(node, N_MEMORY);
Lai Jiangshand9713672012-12-11 16:01:03 -08001463}
1464
Wen Congyanga16cee12012-10-08 16:33:58 -07001465static int __ref __offline_pages(unsigned long start_pfn,
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001466 unsigned long end_pfn, unsigned long timeout)
1467{
1468 unsigned long pfn, nr_pages, expire;
1469 long offlined_pages;
Yasunori Goto7b78d332007-10-21 16:41:36 -07001470 int ret, drain, retry_max, node;
Cody P Schaferd7029092013-07-03 15:02:11 -07001471 unsigned long flags;
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001472 struct zone *zone;
Yasunori Goto7b78d332007-10-21 16:41:36 -07001473 struct memory_notify arg;
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001474
1475 BUG_ON(start_pfn >= end_pfn);
1476 /* at least, alignment against pageblock is necessary */
1477 if (!IS_ALIGNED(start_pfn, pageblock_nr_pages))
1478 return -EINVAL;
1479 if (!IS_ALIGNED(end_pfn, pageblock_nr_pages))
1480 return -EINVAL;
1481 /* This makes hotplug much easier...and readable.
1482 we assume this for now. .*/
1483 if (!test_pages_in_a_zone(start_pfn, end_pfn))
1484 return -EINVAL;
Yasunori Goto7b78d332007-10-21 16:41:36 -07001485
KOSAKI Motohiro20d6c962010-12-02 14:31:19 -08001486 lock_memory_hotplug();
Andi Kleen6ad696d2009-11-17 14:06:22 -08001487
Yasunori Goto7b78d332007-10-21 16:41:36 -07001488 zone = page_zone(pfn_to_page(start_pfn));
1489 node = zone_to_nid(zone);
1490 nr_pages = end_pfn - start_pfn;
1491
Lai Jiangshan74d42d82012-12-11 16:03:23 -08001492 ret = -EINVAL;
1493 if (zone_idx(zone) <= ZONE_NORMAL && !can_offline_normal(zone, nr_pages))
1494 goto out;
1495
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001496 /* set above range as isolated */
Wen Congyangb023f462012-12-11 16:00:45 -08001497 ret = start_isolate_page_range(start_pfn, end_pfn,
1498 MIGRATE_MOVABLE, true);
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001499 if (ret)
Andi Kleen6ad696d2009-11-17 14:06:22 -08001500 goto out;
Yasunori Goto7b78d332007-10-21 16:41:36 -07001501
1502 arg.start_pfn = start_pfn;
1503 arg.nr_pages = nr_pages;
Lai Jiangshand9713672012-12-11 16:01:03 -08001504 node_states_check_changes_offline(nr_pages, zone, &arg);
Yasunori Goto7b78d332007-10-21 16:41:36 -07001505
1506 ret = memory_notify(MEM_GOING_OFFLINE, &arg);
1507 ret = notifier_to_errno(ret);
1508 if (ret)
1509 goto failed_removal;
1510
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001511 pfn = start_pfn;
1512 expire = jiffies + timeout;
1513 drain = 0;
1514 retry_max = 5;
1515repeat:
1516 /* start memory hot removal */
1517 ret = -EAGAIN;
1518 if (time_after(jiffies, expire))
1519 goto failed_removal;
1520 ret = -EINTR;
1521 if (signal_pending(current))
1522 goto failed_removal;
1523 ret = 0;
1524 if (drain) {
1525 lru_add_drain_all();
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001526 cond_resched();
Christoph Lameter9f8f2172008-02-04 22:29:11 -08001527 drain_all_pages();
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001528 }
1529
1530 pfn = scan_lru_pages(start_pfn, end_pfn);
1531 if (pfn) { /* We have page on LRU */
1532 ret = do_migrate_range(pfn, end_pfn);
1533 if (!ret) {
1534 drain = 1;
1535 goto repeat;
1536 } else {
1537 if (ret < 0)
1538 if (--retry_max == 0)
1539 goto failed_removal;
1540 yield();
1541 drain = 1;
1542 goto repeat;
1543 }
1544 }
Adam Buchbinderb3834be2012-09-19 21:48:02 -04001545 /* drain all zone's lru pagevec, this is asynchronous... */
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001546 lru_add_drain_all();
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001547 yield();
Adam Buchbinderb3834be2012-09-19 21:48:02 -04001548 /* drain pcp pages, this is synchronous. */
Christoph Lameter9f8f2172008-02-04 22:29:11 -08001549 drain_all_pages();
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001550 /* check again */
1551 offlined_pages = check_pages_isolated(start_pfn, end_pfn);
1552 if (offlined_pages < 0) {
1553 ret = -EBUSY;
1554 goto failed_removal;
1555 }
1556 printk(KERN_INFO "Offlined Pages %ld\n", offlined_pages);
Adam Buchbinderb3834be2012-09-19 21:48:02 -04001557 /* Ok, all of our target is isolated.
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001558 We cannot do rollback at this point. */
1559 offline_isolated_pages(start_pfn, end_pfn);
KAMEZAWA Hiroyukidbc0e4c2007-11-14 16:59:12 -08001560 /* reset pagetype flags and makes migrate type to be MOVABLE */
Michal Nazarewicz0815f3d2012-04-03 15:06:15 +02001561 undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE);
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001562 /* removal success */
Jiang Liu3dcc0572013-07-03 15:03:21 -07001563 adjust_managed_page_count(pfn_to_page(start_pfn), -offlined_pages);
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001564 zone->present_pages -= offlined_pages;
Cody P Schaferd7029092013-07-03 15:02:11 -07001565
1566 pgdat_resize_lock(zone->zone_pgdat, &flags);
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001567 zone->zone_pgdat->node_present_pages -= offlined_pages;
Cody P Schaferd7029092013-07-03 15:02:11 -07001568 pgdat_resize_unlock(zone->zone_pgdat, &flags);
Yasunori Goto7b78d332007-10-21 16:41:36 -07001569
KOSAKI Motohiro1b79acc2011-05-24 17:11:32 -07001570 init_per_zone_wmark_min();
1571
Xishi Qiu1e8537b2012-10-08 16:31:51 -07001572 if (!populated_zone(zone)) {
Jiang Liu340175b2012-07-31 16:43:32 -07001573 zone_pcp_reset(zone);
Xishi Qiu1e8537b2012-10-08 16:31:51 -07001574 mutex_lock(&zonelists_mutex);
1575 build_all_zonelists(NULL, NULL);
1576 mutex_unlock(&zonelists_mutex);
1577 } else
1578 zone_pcp_update(zone);
Jiang Liu340175b2012-07-31 16:43:32 -07001579
Lai Jiangshand9713672012-12-11 16:01:03 -08001580 node_states_clear_node(node, &arg);
1581 if (arg.status_change_nid >= 0)
David Rientjes8fe23e02009-12-14 17:58:33 -08001582 kswapd_stop(node);
Minchan Kimbce73942009-06-16 15:32:50 -07001583
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001584 vm_total_pages = nr_free_pagecache_pages();
1585 writeback_set_ratelimit();
Yasunori Goto7b78d332007-10-21 16:41:36 -07001586
1587 memory_notify(MEM_OFFLINE, &arg);
KOSAKI Motohiro20d6c962010-12-02 14:31:19 -08001588 unlock_memory_hotplug();
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001589 return 0;
1590
1591failed_removal:
Bjorn Helgaasa62e2f42012-05-29 15:06:30 -07001592 printk(KERN_INFO "memory offlining [mem %#010llx-%#010llx] failed\n",
1593 (unsigned long long) start_pfn << PAGE_SHIFT,
1594 ((unsigned long long) end_pfn << PAGE_SHIFT) - 1);
Yasunori Goto7b78d332007-10-21 16:41:36 -07001595 memory_notify(MEM_CANCEL_OFFLINE, &arg);
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001596 /* pushback to free area */
Michal Nazarewicz0815f3d2012-04-03 15:06:15 +02001597 undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE);
Yasunori Goto7b78d332007-10-21 16:41:36 -07001598
Andi Kleen6ad696d2009-11-17 14:06:22 -08001599out:
KOSAKI Motohiro20d6c962010-12-02 14:31:19 -08001600 unlock_memory_hotplug();
KAMEZAWA Hiroyuki0c0e6192007-10-16 01:26:12 -07001601 return ret;
1602}
Badari Pulavarty71088782008-10-18 20:25:58 -07001603
Wen Congyanga16cee12012-10-08 16:33:58 -07001604int offline_pages(unsigned long start_pfn, unsigned long nr_pages)
1605{
1606 return __offline_pages(start_pfn, start_pfn + nr_pages, 120 * HZ);
1607}
Rafael J. Wysockie2ff3942013-05-08 00:29:49 +02001608#endif /* CONFIG_MEMORY_HOTREMOVE */
Wen Congyanga16cee12012-10-08 16:33:58 -07001609
Wen Congyangbbc76be2013-02-22 16:32:54 -08001610/**
1611 * walk_memory_range - walks through all mem sections in [start_pfn, end_pfn)
1612 * @start_pfn: start pfn of the memory range
Toshi Kanie05c4bb2013-04-29 15:06:16 -07001613 * @end_pfn: end pfn of the memory range
Wen Congyangbbc76be2013-02-22 16:32:54 -08001614 * @arg: argument passed to func
1615 * @func: callback for each memory section walked
1616 *
1617 * This function walks through all present mem sections in range
1618 * [start_pfn, end_pfn) and call func on each mem section.
1619 *
1620 * Returns the return value of func.
1621 */
Rafael J. Wysockie2ff3942013-05-08 00:29:49 +02001622int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
Wen Congyangbbc76be2013-02-22 16:32:54 -08001623 void *arg, int (*func)(struct memory_block *, void *))
Badari Pulavarty71088782008-10-18 20:25:58 -07001624{
Wen Congyange90bdb72012-10-08 16:34:01 -07001625 struct memory_block *mem = NULL;
1626 struct mem_section *section;
Wen Congyange90bdb72012-10-08 16:34:01 -07001627 unsigned long pfn, section_nr;
1628 int ret;
Badari Pulavarty71088782008-10-18 20:25:58 -07001629
Wen Congyange90bdb72012-10-08 16:34:01 -07001630 for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
1631 section_nr = pfn_to_section_nr(pfn);
1632 if (!present_section_nr(section_nr))
1633 continue;
1634
1635 section = __nr_to_section(section_nr);
1636 /* same memblock? */
1637 if (mem)
1638 if ((section_nr >= mem->start_section_nr) &&
1639 (section_nr <= mem->end_section_nr))
1640 continue;
1641
1642 mem = find_memory_block_hinted(section, mem);
1643 if (!mem)
1644 continue;
1645
Wen Congyangbbc76be2013-02-22 16:32:54 -08001646 ret = func(mem, arg);
Wen Congyange90bdb72012-10-08 16:34:01 -07001647 if (ret) {
Wen Congyangbbc76be2013-02-22 16:32:54 -08001648 kobject_put(&mem->dev.kobj);
1649 return ret;
Wen Congyange90bdb72012-10-08 16:34:01 -07001650 }
1651 }
1652
1653 if (mem)
1654 kobject_put(&mem->dev.kobj);
1655
Wen Congyangbbc76be2013-02-22 16:32:54 -08001656 return 0;
1657}
1658
Rafael J. Wysockie2ff3942013-05-08 00:29:49 +02001659#ifdef CONFIG_MEMORY_HOTREMOVE
Wen Congyangbbc76be2013-02-22 16:32:54 -08001660static int is_memblock_offlined_cb(struct memory_block *mem, void *arg)
1661{
1662 int ret = !is_memblock_offlined(mem);
1663
Randy Dunlap349daa02013-04-29 15:08:49 -07001664 if (unlikely(ret)) {
1665 phys_addr_t beginpa, endpa;
1666
1667 beginpa = PFN_PHYS(section_nr_to_pfn(mem->start_section_nr));
1668 endpa = PFN_PHYS(section_nr_to_pfn(mem->end_section_nr + 1))-1;
Wen Congyangbbc76be2013-02-22 16:32:54 -08001669 pr_warn("removing memory fails, because memory "
Randy Dunlap349daa02013-04-29 15:08:49 -07001670 "[%pa-%pa] is onlined\n",
1671 &beginpa, &endpa);
1672 }
Wen Congyangbbc76be2013-02-22 16:32:54 -08001673
1674 return ret;
1675}
1676
Tang Chen60a5a192013-02-22 16:33:14 -08001677static int check_cpu_on_node(void *data)
1678{
1679 struct pglist_data *pgdat = data;
1680 int cpu;
1681
1682 for_each_present_cpu(cpu) {
1683 if (cpu_to_node(cpu) == pgdat->node_id)
1684 /*
1685 * the cpu on this node isn't removed, and we can't
1686 * offline this node.
1687 */
1688 return -EBUSY;
1689 }
1690
1691 return 0;
1692}
1693
Wen Congyange13fe862013-02-22 16:33:31 -08001694static void unmap_cpu_on_node(void *data)
1695{
1696#ifdef CONFIG_ACPI_NUMA
1697 struct pglist_data *pgdat = data;
1698 int cpu;
1699
1700 for_each_possible_cpu(cpu)
1701 if (cpu_to_node(cpu) == pgdat->node_id)
1702 numa_clear_node(cpu);
1703#endif
1704}
1705
1706static int check_and_unmap_cpu_on_node(void *data)
1707{
1708 int ret = check_cpu_on_node(data);
1709
1710 if (ret)
1711 return ret;
1712
1713 /*
1714 * the node will be offlined when we come here, so we can clear
1715 * the cpu_to_node() now.
1716 */
1717
1718 unmap_cpu_on_node(data);
1719 return 0;
1720}
1721
Tang Chen60a5a192013-02-22 16:33:14 -08001722/* offline the node if all memory sections of this node are removed */
Wen Congyang90b30cd2013-02-22 16:33:27 -08001723void try_offline_node(int nid)
Tang Chen60a5a192013-02-22 16:33:14 -08001724{
Wen Congyangd822b862013-02-22 16:33:16 -08001725 pg_data_t *pgdat = NODE_DATA(nid);
1726 unsigned long start_pfn = pgdat->node_start_pfn;
1727 unsigned long end_pfn = start_pfn + pgdat->node_spanned_pages;
Tang Chen60a5a192013-02-22 16:33:14 -08001728 unsigned long pfn;
Wen Congyangd822b862013-02-22 16:33:16 -08001729 struct page *pgdat_page = virt_to_page(pgdat);
1730 int i;
Tang Chen60a5a192013-02-22 16:33:14 -08001731
1732 for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) {
1733 unsigned long section_nr = pfn_to_section_nr(pfn);
1734
1735 if (!present_section_nr(section_nr))
1736 continue;
1737
1738 if (pfn_to_nid(pfn) != nid)
1739 continue;
1740
1741 /*
1742 * some memory sections of this node are not removed, and we
1743 * can't offline node now.
1744 */
1745 return;
1746 }
1747
Wen Congyange13fe862013-02-22 16:33:31 -08001748 if (stop_machine(check_and_unmap_cpu_on_node, pgdat, NULL))
Tang Chen60a5a192013-02-22 16:33:14 -08001749 return;
1750
1751 /*
1752 * all memory/cpu of this node are removed, we can offline this
1753 * node now.
1754 */
1755 node_set_offline(nid);
1756 unregister_one_node(nid);
Wen Congyangd822b862013-02-22 16:33:16 -08001757
1758 if (!PageSlab(pgdat_page) && !PageCompound(pgdat_page))
1759 /* node data is allocated from boot memory */
1760 return;
1761
1762 /* free waittable in each zone */
1763 for (i = 0; i < MAX_NR_ZONES; i++) {
1764 struct zone *zone = pgdat->node_zones + i;
1765
Jianguo Wuca4b3f32013-03-22 15:04:50 -07001766 /*
1767 * wait_table may be allocated from boot memory,
1768 * here only free if it's allocated by vmalloc.
1769 */
1770 if (is_vmalloc_addr(zone->wait_table))
Wen Congyangd822b862013-02-22 16:33:16 -08001771 vfree(zone->wait_table);
1772 }
1773
1774 /*
1775 * Since there is no way to guarentee the address of pgdat/zone is not
1776 * on stack of any kernel threads or used by other kernel objects
1777 * without reference counting or other symchronizing method, do not
1778 * reset node_data and free pgdat here. Just reset it to 0 and reuse
1779 * the memory when the node is online again.
1780 */
1781 memset(pgdat, 0, sizeof(*pgdat));
Tang Chen60a5a192013-02-22 16:33:14 -08001782}
Wen Congyang90b30cd2013-02-22 16:33:27 -08001783EXPORT_SYMBOL(try_offline_node);
Tang Chen60a5a192013-02-22 16:33:14 -08001784
Rafael J. Wysocki242831e2013-05-27 12:58:46 +02001785void __ref remove_memory(int nid, u64 start, u64 size)
Wen Congyangbbc76be2013-02-22 16:32:54 -08001786{
Rafael J. Wysocki242831e2013-05-27 12:58:46 +02001787 int ret;
Wen Congyang993c1aa2013-02-22 16:32:50 -08001788
Yasuaki Ishimatsu6677e3e2013-02-22 16:32:52 -08001789 lock_memory_hotplug();
1790
1791 /*
Rafael J. Wysocki242831e2013-05-27 12:58:46 +02001792 * All memory blocks must be offlined before removing memory. Check
1793 * whether all memory blocks in question are offline and trigger a BUG()
1794 * if this is not the case.
Yasuaki Ishimatsu6677e3e2013-02-22 16:32:52 -08001795 */
Rafael J. Wysocki242831e2013-05-27 12:58:46 +02001796 ret = walk_memory_range(PFN_DOWN(start), PFN_UP(start + size - 1), NULL,
Wen Congyangbbc76be2013-02-22 16:32:54 -08001797 is_memblock_offlined_cb);
1798 if (ret) {
1799 unlock_memory_hotplug();
Rafael J. Wysocki242831e2013-05-27 12:58:46 +02001800 BUG();
Yasuaki Ishimatsu6677e3e2013-02-22 16:32:52 -08001801 }
1802
Yasuaki Ishimatsu46c66c42013-02-22 16:32:56 -08001803 /* remove memmap entry */
1804 firmware_map_remove(start, start + size, "System RAM");
1805
Wen Congyang24d335c2013-02-22 16:32:58 -08001806 arch_remove_memory(start, size);
1807
Tang Chen60a5a192013-02-22 16:33:14 -08001808 try_offline_node(nid);
1809
Yasuaki Ishimatsu6677e3e2013-02-22 16:32:52 -08001810 unlock_memory_hotplug();
Badari Pulavarty71088782008-10-18 20:25:58 -07001811}
Badari Pulavarty71088782008-10-18 20:25:58 -07001812EXPORT_SYMBOL_GPL(remove_memory);
Rafael J. Wysockiaba6efc2013-06-01 22:24:07 +02001813#endif /* CONFIG_MEMORY_HOTREMOVE */