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> | |
14 | #include <linux/module.h> | |
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> |
3947be19 DH |
32 | |
33 | #include <asm/tlbflush.h> | |
34 | ||
1e5ad9a3 AB |
35 | #include "internal.h" |
36 | ||
20d6c96b KM |
37 | DEFINE_MUTEX(mem_hotplug_mutex); |
38 | ||
39 | void lock_memory_hotplug(void) | |
40 | { | |
41 | mutex_lock(&mem_hotplug_mutex); | |
42 | ||
43 | /* for exclusive hibernation if CONFIG_HIBERNATION=y */ | |
44 | lock_system_sleep(); | |
45 | } | |
46 | ||
47 | void unlock_memory_hotplug(void) | |
48 | { | |
49 | unlock_system_sleep(); | |
50 | mutex_unlock(&mem_hotplug_mutex); | |
51 | } | |
52 | ||
53 | ||
45e0b78b KM |
54 | /* add this memory to iomem resource */ |
55 | static struct resource *register_memory_resource(u64 start, u64 size) | |
56 | { | |
57 | struct resource *res; | |
58 | res = kzalloc(sizeof(struct resource), GFP_KERNEL); | |
59 | BUG_ON(!res); | |
60 | ||
61 | res->name = "System RAM"; | |
62 | res->start = start; | |
63 | res->end = start + size - 1; | |
887c3cb1 | 64 | res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; |
45e0b78b KM |
65 | if (request_resource(&iomem_resource, res) < 0) { |
66 | printk("System RAM resource %llx - %llx cannot be added\n", | |
67 | (unsigned long long)res->start, (unsigned long long)res->end); | |
68 | kfree(res); | |
69 | res = NULL; | |
70 | } | |
71 | return res; | |
72 | } | |
73 | ||
74 | static void release_memory_resource(struct resource *res) | |
75 | { | |
76 | if (!res) | |
77 | return; | |
78 | release_resource(res); | |
79 | kfree(res); | |
80 | return; | |
81 | } | |
82 | ||
53947027 | 83 | #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE |
04753278 | 84 | #ifndef CONFIG_SPARSEMEM_VMEMMAP |
5f24ce5f AA |
85 | static void get_page_bootmem(unsigned long info, struct page *page, |
86 | unsigned long type) | |
04753278 | 87 | { |
5f24ce5f | 88 | page->lru.next = (struct list_head *) type; |
04753278 YG |
89 | SetPagePrivate(page); |
90 | set_page_private(page, info); | |
91 | atomic_inc(&page->_count); | |
92 | } | |
93 | ||
23ce932a RM |
94 | /* reference to __meminit __free_pages_bootmem is valid |
95 | * so use __ref to tell modpost not to generate a warning */ | |
96 | void __ref put_page_bootmem(struct page *page) | |
04753278 | 97 | { |
5f24ce5f | 98 | unsigned long type; |
04753278 | 99 | |
5f24ce5f AA |
100 | type = (unsigned long) page->lru.next; |
101 | BUG_ON(type < MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE || | |
102 | type > MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE); | |
04753278 YG |
103 | |
104 | if (atomic_dec_return(&page->_count) == 1) { | |
105 | ClearPagePrivate(page); | |
106 | set_page_private(page, 0); | |
5f24ce5f | 107 | INIT_LIST_HEAD(&page->lru); |
04753278 YG |
108 | __free_pages_bootmem(page, 0); |
109 | } | |
110 | ||
111 | } | |
112 | ||
d92bc318 | 113 | static void register_page_bootmem_info_section(unsigned long start_pfn) |
04753278 YG |
114 | { |
115 | unsigned long *usemap, mapsize, section_nr, i; | |
116 | struct mem_section *ms; | |
117 | struct page *page, *memmap; | |
118 | ||
119 | if (!pfn_valid(start_pfn)) | |
120 | return; | |
121 | ||
122 | section_nr = pfn_to_section_nr(start_pfn); | |
123 | ms = __nr_to_section(section_nr); | |
124 | ||
125 | /* Get section's memmap address */ | |
126 | memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); | |
127 | ||
128 | /* | |
129 | * Get page for the memmap's phys address | |
130 | * XXX: need more consideration for sparse_vmemmap... | |
131 | */ | |
132 | page = virt_to_page(memmap); | |
133 | mapsize = sizeof(struct page) * PAGES_PER_SECTION; | |
134 | mapsize = PAGE_ALIGN(mapsize) >> PAGE_SHIFT; | |
135 | ||
136 | /* remember memmap's page */ | |
137 | for (i = 0; i < mapsize; i++, page++) | |
138 | get_page_bootmem(section_nr, page, SECTION_INFO); | |
139 | ||
140 | usemap = __nr_to_section(section_nr)->pageblock_flags; | |
141 | page = virt_to_page(usemap); | |
142 | ||
143 | mapsize = PAGE_ALIGN(usemap_size()) >> PAGE_SHIFT; | |
144 | ||
145 | for (i = 0; i < mapsize; i++, page++) | |
af370fb8 | 146 | get_page_bootmem(section_nr, page, MIX_SECTION_INFO); |
04753278 YG |
147 | |
148 | } | |
149 | ||
150 | void register_page_bootmem_info_node(struct pglist_data *pgdat) | |
151 | { | |
152 | unsigned long i, pfn, end_pfn, nr_pages; | |
153 | int node = pgdat->node_id; | |
154 | struct page *page; | |
155 | struct zone *zone; | |
156 | ||
157 | nr_pages = PAGE_ALIGN(sizeof(struct pglist_data)) >> PAGE_SHIFT; | |
158 | page = virt_to_page(pgdat); | |
159 | ||
160 | for (i = 0; i < nr_pages; i++, page++) | |
161 | get_page_bootmem(node, page, NODE_INFO); | |
162 | ||
163 | zone = &pgdat->node_zones[0]; | |
164 | for (; zone < pgdat->node_zones + MAX_NR_ZONES - 1; zone++) { | |
165 | if (zone->wait_table) { | |
166 | nr_pages = zone->wait_table_hash_nr_entries | |
167 | * sizeof(wait_queue_head_t); | |
168 | nr_pages = PAGE_ALIGN(nr_pages) >> PAGE_SHIFT; | |
169 | page = virt_to_page(zone->wait_table); | |
170 | ||
171 | for (i = 0; i < nr_pages; i++, page++) | |
172 | get_page_bootmem(node, page, NODE_INFO); | |
173 | } | |
174 | } | |
175 | ||
176 | pfn = pgdat->node_start_pfn; | |
177 | end_pfn = pfn + pgdat->node_spanned_pages; | |
178 | ||
179 | /* register_section info */ | |
180 | for (; pfn < end_pfn; pfn += PAGES_PER_SECTION) | |
181 | register_page_bootmem_info_section(pfn); | |
182 | ||
183 | } | |
184 | #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ | |
185 | ||
76cdd58e HC |
186 | static void grow_zone_span(struct zone *zone, unsigned long start_pfn, |
187 | unsigned long end_pfn) | |
188 | { | |
189 | unsigned long old_zone_end_pfn; | |
190 | ||
191 | zone_span_writelock(zone); | |
192 | ||
193 | old_zone_end_pfn = zone->zone_start_pfn + zone->spanned_pages; | |
194 | if (start_pfn < zone->zone_start_pfn) | |
195 | zone->zone_start_pfn = start_pfn; | |
196 | ||
197 | zone->spanned_pages = max(old_zone_end_pfn, end_pfn) - | |
198 | zone->zone_start_pfn; | |
199 | ||
200 | zone_span_writeunlock(zone); | |
201 | } | |
202 | ||
203 | static void grow_pgdat_span(struct pglist_data *pgdat, unsigned long start_pfn, | |
204 | unsigned long end_pfn) | |
205 | { | |
206 | unsigned long old_pgdat_end_pfn = | |
207 | pgdat->node_start_pfn + pgdat->node_spanned_pages; | |
208 | ||
209 | if (start_pfn < pgdat->node_start_pfn) | |
210 | pgdat->node_start_pfn = start_pfn; | |
211 | ||
212 | pgdat->node_spanned_pages = max(old_pgdat_end_pfn, end_pfn) - | |
213 | pgdat->node_start_pfn; | |
214 | } | |
215 | ||
31168481 | 216 | static int __meminit __add_zone(struct zone *zone, unsigned long phys_start_pfn) |
3947be19 DH |
217 | { |
218 | struct pglist_data *pgdat = zone->zone_pgdat; | |
219 | int nr_pages = PAGES_PER_SECTION; | |
220 | int nid = pgdat->node_id; | |
221 | int zone_type; | |
76cdd58e | 222 | unsigned long flags; |
3947be19 DH |
223 | |
224 | zone_type = zone - pgdat->node_zones; | |
76cdd58e HC |
225 | if (!zone->wait_table) { |
226 | int ret; | |
227 | ||
228 | ret = init_currently_empty_zone(zone, phys_start_pfn, | |
229 | nr_pages, MEMMAP_HOTPLUG); | |
230 | if (ret) | |
231 | return ret; | |
232 | } | |
233 | pgdat_resize_lock(zone->zone_pgdat, &flags); | |
234 | grow_zone_span(zone, phys_start_pfn, phys_start_pfn + nr_pages); | |
235 | grow_pgdat_span(zone->zone_pgdat, phys_start_pfn, | |
236 | phys_start_pfn + nr_pages); | |
237 | pgdat_resize_unlock(zone->zone_pgdat, &flags); | |
a2f3aa02 DH |
238 | memmap_init_zone(nr_pages, nid, zone_type, |
239 | phys_start_pfn, MEMMAP_HOTPLUG); | |
718127cc | 240 | return 0; |
3947be19 DH |
241 | } |
242 | ||
c04fc586 GH |
243 | static int __meminit __add_section(int nid, struct zone *zone, |
244 | unsigned long phys_start_pfn) | |
3947be19 | 245 | { |
3947be19 | 246 | int nr_pages = PAGES_PER_SECTION; |
3947be19 DH |
247 | int ret; |
248 | ||
ebd15302 KH |
249 | if (pfn_valid(phys_start_pfn)) |
250 | return -EEXIST; | |
251 | ||
0b0acbec | 252 | ret = sparse_add_one_section(zone, phys_start_pfn, nr_pages); |
3947be19 DH |
253 | |
254 | if (ret < 0) | |
255 | return ret; | |
256 | ||
718127cc YG |
257 | ret = __add_zone(zone, phys_start_pfn); |
258 | ||
259 | if (ret < 0) | |
260 | return ret; | |
261 | ||
c04fc586 | 262 | return register_new_memory(nid, __pfn_to_section(phys_start_pfn)); |
3947be19 DH |
263 | } |
264 | ||
0c0a4a51 YG |
265 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
266 | static int __remove_section(struct zone *zone, struct mem_section *ms) | |
267 | { | |
268 | /* | |
269 | * XXX: Freeing memmap with vmemmap is not implement yet. | |
270 | * This should be removed later. | |
271 | */ | |
272 | return -EBUSY; | |
273 | } | |
274 | #else | |
ea01ea93 BP |
275 | static int __remove_section(struct zone *zone, struct mem_section *ms) |
276 | { | |
277 | unsigned long flags; | |
278 | struct pglist_data *pgdat = zone->zone_pgdat; | |
279 | int ret = -EINVAL; | |
280 | ||
281 | if (!valid_section(ms)) | |
282 | return ret; | |
283 | ||
284 | ret = unregister_memory_section(ms); | |
285 | if (ret) | |
286 | return ret; | |
287 | ||
288 | pgdat_resize_lock(pgdat, &flags); | |
289 | sparse_remove_one_section(zone, ms); | |
290 | pgdat_resize_unlock(pgdat, &flags); | |
291 | return 0; | |
292 | } | |
0c0a4a51 | 293 | #endif |
ea01ea93 | 294 | |
3947be19 DH |
295 | /* |
296 | * Reasonably generic function for adding memory. It is | |
297 | * expected that archs that support memory hotplug will | |
298 | * call this function after deciding the zone to which to | |
299 | * add the new pages. | |
300 | */ | |
c04fc586 GH |
301 | int __ref __add_pages(int nid, struct zone *zone, unsigned long phys_start_pfn, |
302 | unsigned long nr_pages) | |
3947be19 DH |
303 | { |
304 | unsigned long i; | |
305 | int err = 0; | |
6f712711 KH |
306 | int start_sec, end_sec; |
307 | /* during initialize mem_map, align hot-added range to section */ | |
308 | start_sec = pfn_to_section_nr(phys_start_pfn); | |
309 | end_sec = pfn_to_section_nr(phys_start_pfn + nr_pages - 1); | |
3947be19 | 310 | |
6f712711 | 311 | for (i = start_sec; i <= end_sec; i++) { |
c04fc586 | 312 | err = __add_section(nid, zone, i << PFN_SECTION_SHIFT); |
3947be19 | 313 | |
6f712711 | 314 | /* |
183ff22b | 315 | * EEXIST is finally dealt with by ioresource collision |
6f712711 KH |
316 | * check. see add_memory() => register_memory_resource() |
317 | * Warning will be printed if there is collision. | |
bed120c6 JS |
318 | */ |
319 | if (err && (err != -EEXIST)) | |
3947be19 | 320 | break; |
6f712711 | 321 | err = 0; |
3947be19 DH |
322 | } |
323 | ||
324 | return err; | |
325 | } | |
bed120c6 | 326 | EXPORT_SYMBOL_GPL(__add_pages); |
3947be19 | 327 | |
ea01ea93 BP |
328 | /** |
329 | * __remove_pages() - remove sections of pages from a zone | |
330 | * @zone: zone from which pages need to be removed | |
331 | * @phys_start_pfn: starting pageframe (must be aligned to start of a section) | |
332 | * @nr_pages: number of pages to remove (must be multiple of section size) | |
333 | * | |
334 | * Generic helper function to remove section mappings and sysfs entries | |
335 | * for the section of the memory we are removing. Caller needs to make | |
336 | * sure that pages are marked reserved and zones are adjust properly by | |
337 | * calling offline_pages(). | |
338 | */ | |
339 | int __remove_pages(struct zone *zone, unsigned long phys_start_pfn, | |
340 | unsigned long nr_pages) | |
341 | { | |
342 | unsigned long i, ret = 0; | |
343 | int sections_to_remove; | |
344 | ||
345 | /* | |
346 | * We can only remove entire sections | |
347 | */ | |
348 | BUG_ON(phys_start_pfn & ~PAGE_SECTION_MASK); | |
349 | BUG_ON(nr_pages % PAGES_PER_SECTION); | |
350 | ||
ea01ea93 BP |
351 | sections_to_remove = nr_pages / PAGES_PER_SECTION; |
352 | for (i = 0; i < sections_to_remove; i++) { | |
353 | unsigned long pfn = phys_start_pfn + i*PAGES_PER_SECTION; | |
de7f0cba NF |
354 | release_mem_region(pfn << PAGE_SHIFT, |
355 | PAGES_PER_SECTION << PAGE_SHIFT); | |
ea01ea93 BP |
356 | ret = __remove_section(zone, __pfn_to_section(pfn)); |
357 | if (ret) | |
358 | break; | |
359 | } | |
360 | return ret; | |
361 | } | |
362 | EXPORT_SYMBOL_GPL(__remove_pages); | |
363 | ||
180c06ef JF |
364 | void online_page(struct page *page) |
365 | { | |
4738e1b9 JB |
366 | unsigned long pfn = page_to_pfn(page); |
367 | ||
180c06ef | 368 | totalram_pages++; |
4738e1b9 JB |
369 | if (pfn >= num_physpages) |
370 | num_physpages = pfn + 1; | |
180c06ef JF |
371 | |
372 | #ifdef CONFIG_HIGHMEM | |
373 | if (PageHighMem(page)) | |
374 | totalhigh_pages++; | |
375 | #endif | |
376 | ||
377 | #ifdef CONFIG_FLATMEM | |
378 | max_mapnr = max(page_to_pfn(page), max_mapnr); | |
379 | #endif | |
380 | ||
381 | ClearPageReserved(page); | |
382 | init_page_count(page); | |
383 | __free_page(page); | |
384 | } | |
385 | ||
75884fb1 KH |
386 | static int online_pages_range(unsigned long start_pfn, unsigned long nr_pages, |
387 | void *arg) | |
3947be19 DH |
388 | { |
389 | unsigned long i; | |
75884fb1 KH |
390 | unsigned long onlined_pages = *(unsigned long *)arg; |
391 | struct page *page; | |
392 | if (PageReserved(pfn_to_page(start_pfn))) | |
393 | for (i = 0; i < nr_pages; i++) { | |
394 | page = pfn_to_page(start_pfn + i); | |
395 | online_page(page); | |
396 | onlined_pages++; | |
397 | } | |
398 | *(unsigned long *)arg = onlined_pages; | |
399 | return 0; | |
400 | } | |
401 | ||
402 | ||
403 | int online_pages(unsigned long pfn, unsigned long nr_pages) | |
404 | { | |
3947be19 DH |
405 | unsigned long onlined_pages = 0; |
406 | struct zone *zone; | |
6811378e | 407 | int need_zonelists_rebuild = 0; |
7b78d335 YG |
408 | int nid; |
409 | int ret; | |
410 | struct memory_notify arg; | |
411 | ||
412 | arg.start_pfn = pfn; | |
413 | arg.nr_pages = nr_pages; | |
414 | arg.status_change_nid = -1; | |
415 | ||
416 | nid = page_to_nid(pfn_to_page(pfn)); | |
417 | if (node_present_pages(nid) == 0) | |
418 | arg.status_change_nid = nid; | |
3947be19 | 419 | |
7b78d335 YG |
420 | ret = memory_notify(MEM_GOING_ONLINE, &arg); |
421 | ret = notifier_to_errno(ret); | |
422 | if (ret) { | |
423 | memory_notify(MEM_CANCEL_ONLINE, &arg); | |
424 | return ret; | |
425 | } | |
3947be19 DH |
426 | /* |
427 | * This doesn't need a lock to do pfn_to_page(). | |
428 | * The section can't be removed here because of the | |
da19cbcf | 429 | * memory_block->state_mutex. |
3947be19 DH |
430 | */ |
431 | zone = page_zone(pfn_to_page(pfn)); | |
6811378e YG |
432 | /* |
433 | * If this zone is not populated, then it is not in zonelist. | |
434 | * This means the page allocator ignores this zone. | |
435 | * So, zonelist must be updated after online. | |
436 | */ | |
4eaf3f64 | 437 | mutex_lock(&zonelists_mutex); |
6811378e YG |
438 | if (!populated_zone(zone)) |
439 | need_zonelists_rebuild = 1; | |
440 | ||
908eedc6 | 441 | ret = walk_system_ram_range(pfn, nr_pages, &onlined_pages, |
75884fb1 | 442 | online_pages_range); |
fd8a4221 | 443 | if (ret) { |
4eaf3f64 | 444 | mutex_unlock(&zonelists_mutex); |
fd8a4221 GL |
445 | printk(KERN_DEBUG "online_pages %lx at %lx failed\n", |
446 | nr_pages, pfn); | |
447 | memory_notify(MEM_CANCEL_ONLINE, &arg); | |
448 | return ret; | |
449 | } | |
450 | ||
3947be19 | 451 | zone->present_pages += onlined_pages; |
f2937be5 | 452 | zone->zone_pgdat->node_present_pages += onlined_pages; |
1f522509 HL |
453 | if (need_zonelists_rebuild) |
454 | build_all_zonelists(zone); | |
455 | else | |
456 | zone_pcp_update(zone); | |
3947be19 | 457 | |
4eaf3f64 | 458 | mutex_unlock(&zonelists_mutex); |
bc75d33f | 459 | setup_per_zone_wmarks(); |
bce7394a | 460 | calculate_zone_inactive_ratio(zone); |
7ea1530a CL |
461 | if (onlined_pages) { |
462 | kswapd_run(zone_to_nid(zone)); | |
463 | node_set_state(zone_to_nid(zone), N_HIGH_MEMORY); | |
464 | } | |
61b13993 | 465 | |
1f522509 | 466 | vm_total_pages = nr_free_pagecache_pages(); |
2f7f24ec | 467 | |
2d1d43f6 | 468 | writeback_set_ratelimit(); |
7b78d335 YG |
469 | |
470 | if (onlined_pages) | |
471 | memory_notify(MEM_ONLINE, &arg); | |
472 | ||
3947be19 DH |
473 | return 0; |
474 | } | |
53947027 | 475 | #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ |
bc02af93 | 476 | |
e1319331 HS |
477 | /* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */ |
478 | static pg_data_t __ref *hotadd_new_pgdat(int nid, u64 start) | |
9af3c2de YG |
479 | { |
480 | struct pglist_data *pgdat; | |
481 | unsigned long zones_size[MAX_NR_ZONES] = {0}; | |
482 | unsigned long zholes_size[MAX_NR_ZONES] = {0}; | |
483 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
484 | ||
485 | pgdat = arch_alloc_nodedata(nid); | |
486 | if (!pgdat) | |
487 | return NULL; | |
488 | ||
489 | arch_refresh_nodedata(nid, pgdat); | |
490 | ||
491 | /* we can use NODE_DATA(nid) from here */ | |
492 | ||
493 | /* init node's zones as empty zones, we don't have any present pages.*/ | |
9109fb7b | 494 | free_area_init_node(nid, zones_size, start_pfn, zholes_size); |
9af3c2de YG |
495 | |
496 | return pgdat; | |
497 | } | |
498 | ||
499 | static void rollback_node_hotadd(int nid, pg_data_t *pgdat) | |
500 | { | |
501 | arch_refresh_nodedata(nid, NULL); | |
502 | arch_free_nodedata(pgdat); | |
503 | return; | |
504 | } | |
505 | ||
0a547039 | 506 | |
cf23422b | 507 | /* |
508 | * called by cpu_up() to online a node without onlined memory. | |
509 | */ | |
510 | int mem_online_node(int nid) | |
511 | { | |
512 | pg_data_t *pgdat; | |
513 | int ret; | |
514 | ||
20d6c96b | 515 | lock_memory_hotplug(); |
cf23422b | 516 | pgdat = hotadd_new_pgdat(nid, 0); |
517 | if (pgdat) { | |
518 | ret = -ENOMEM; | |
519 | goto out; | |
520 | } | |
521 | node_set_online(nid); | |
522 | ret = register_one_node(nid); | |
523 | BUG_ON(ret); | |
524 | ||
525 | out: | |
20d6c96b | 526 | unlock_memory_hotplug(); |
cf23422b | 527 | return ret; |
528 | } | |
529 | ||
31168481 AV |
530 | /* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */ |
531 | int __ref add_memory(int nid, u64 start, u64 size) | |
bc02af93 | 532 | { |
9af3c2de YG |
533 | pg_data_t *pgdat = NULL; |
534 | int new_pgdat = 0; | |
ebd15302 | 535 | struct resource *res; |
bc02af93 YG |
536 | int ret; |
537 | ||
20d6c96b | 538 | lock_memory_hotplug(); |
6ad696d2 | 539 | |
ebd15302 | 540 | res = register_memory_resource(start, size); |
6ad696d2 | 541 | ret = -EEXIST; |
ebd15302 | 542 | if (!res) |
6ad696d2 | 543 | goto out; |
ebd15302 | 544 | |
9af3c2de YG |
545 | if (!node_online(nid)) { |
546 | pgdat = hotadd_new_pgdat(nid, start); | |
6ad696d2 | 547 | ret = -ENOMEM; |
9af3c2de | 548 | if (!pgdat) |
6ad696d2 | 549 | goto out; |
9af3c2de | 550 | new_pgdat = 1; |
9af3c2de YG |
551 | } |
552 | ||
bc02af93 YG |
553 | /* call arch's memory hotadd */ |
554 | ret = arch_add_memory(nid, start, size); | |
555 | ||
9af3c2de YG |
556 | if (ret < 0) |
557 | goto error; | |
558 | ||
0fc44159 | 559 | /* we online node here. we can't roll back from here. */ |
9af3c2de YG |
560 | node_set_online(nid); |
561 | ||
0fc44159 YG |
562 | if (new_pgdat) { |
563 | ret = register_one_node(nid); | |
564 | /* | |
565 | * If sysfs file of new node can't create, cpu on the node | |
566 | * can't be hot-added. There is no rollback way now. | |
567 | * So, check by BUG_ON() to catch it reluctantly.. | |
568 | */ | |
569 | BUG_ON(ret); | |
570 | } | |
571 | ||
d96ae530 | 572 | /* create new memmap entry */ |
573 | firmware_map_add_hotplug(start, start + size, "System RAM"); | |
574 | ||
6ad696d2 AK |
575 | goto out; |
576 | ||
9af3c2de YG |
577 | error: |
578 | /* rollback pgdat allocation and others */ | |
579 | if (new_pgdat) | |
580 | rollback_node_hotadd(nid, pgdat); | |
ebd15302 KH |
581 | if (res) |
582 | release_memory_resource(res); | |
9af3c2de | 583 | |
6ad696d2 | 584 | out: |
20d6c96b | 585 | unlock_memory_hotplug(); |
bc02af93 YG |
586 | return ret; |
587 | } | |
588 | EXPORT_SYMBOL_GPL(add_memory); | |
0c0e6195 KH |
589 | |
590 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
5c755e9f BP |
591 | /* |
592 | * A free page on the buddy free lists (not the per-cpu lists) has PageBuddy | |
593 | * set and the size of the free page is given by page_order(). Using this, | |
594 | * the function determines if the pageblock contains only free pages. | |
595 | * Due to buddy contraints, a free page at least the size of a pageblock will | |
596 | * be located at the start of the pageblock | |
597 | */ | |
598 | static inline int pageblock_free(struct page *page) | |
599 | { | |
600 | return PageBuddy(page) && page_order(page) >= pageblock_order; | |
601 | } | |
602 | ||
603 | /* Return the start of the next active pageblock after a given page */ | |
604 | static struct page *next_active_pageblock(struct page *page) | |
605 | { | |
5c755e9f BP |
606 | /* Ensure the starting page is pageblock-aligned */ |
607 | BUG_ON(page_to_pfn(page) & (pageblock_nr_pages - 1)); | |
608 | ||
5c755e9f | 609 | /* If the entire pageblock is free, move to the end of free page */ |
0dcc48c1 KH |
610 | if (pageblock_free(page)) { |
611 | int order; | |
612 | /* be careful. we don't have locks, page_order can be changed.*/ | |
613 | order = page_order(page); | |
614 | if ((order < MAX_ORDER) && (order >= pageblock_order)) | |
615 | return page + (1 << order); | |
616 | } | |
5c755e9f | 617 | |
0dcc48c1 | 618 | return page + pageblock_nr_pages; |
5c755e9f BP |
619 | } |
620 | ||
621 | /* Checks if this range of memory is likely to be hot-removable. */ | |
622 | int is_mem_section_removable(unsigned long start_pfn, unsigned long nr_pages) | |
623 | { | |
5c755e9f BP |
624 | struct page *page = pfn_to_page(start_pfn); |
625 | struct page *end_page = page + nr_pages; | |
626 | ||
627 | /* Check the starting page of each pageblock within the range */ | |
628 | for (; page < end_page; page = next_active_pageblock(page)) { | |
49ac8255 | 629 | if (!is_pageblock_removable_nolock(page)) |
5c755e9f | 630 | return 0; |
49ac8255 | 631 | cond_resched(); |
5c755e9f BP |
632 | } |
633 | ||
634 | /* All pageblocks in the memory block are likely to be hot-removable */ | |
635 | return 1; | |
636 | } | |
637 | ||
0c0e6195 KH |
638 | /* |
639 | * Confirm all pages in a range [start, end) is belongs to the same zone. | |
640 | */ | |
641 | static int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn) | |
642 | { | |
643 | unsigned long pfn; | |
644 | struct zone *zone = NULL; | |
645 | struct page *page; | |
646 | int i; | |
647 | for (pfn = start_pfn; | |
648 | pfn < end_pfn; | |
649 | pfn += MAX_ORDER_NR_PAGES) { | |
650 | i = 0; | |
651 | /* This is just a CONFIG_HOLES_IN_ZONE check.*/ | |
652 | while ((i < MAX_ORDER_NR_PAGES) && !pfn_valid_within(pfn + i)) | |
653 | i++; | |
654 | if (i == MAX_ORDER_NR_PAGES) | |
655 | continue; | |
656 | page = pfn_to_page(pfn + i); | |
657 | if (zone && page_zone(page) != zone) | |
658 | return 0; | |
659 | zone = page_zone(page); | |
660 | } | |
661 | return 1; | |
662 | } | |
663 | ||
664 | /* | |
665 | * Scanning pfn is much easier than scanning lru list. | |
666 | * Scan pfn from start to end and Find LRU page. | |
667 | */ | |
7bbc0905 | 668 | static unsigned long scan_lru_pages(unsigned long start, unsigned long end) |
0c0e6195 KH |
669 | { |
670 | unsigned long pfn; | |
671 | struct page *page; | |
672 | for (pfn = start; pfn < end; pfn++) { | |
673 | if (pfn_valid(pfn)) { | |
674 | page = pfn_to_page(pfn); | |
675 | if (PageLRU(page)) | |
676 | return pfn; | |
677 | } | |
678 | } | |
679 | return 0; | |
680 | } | |
681 | ||
682 | static struct page * | |
3c1d4378 | 683 | hotremove_migrate_alloc(struct page *page, unsigned long private, int **x) |
0c0e6195 | 684 | { |
3c1d4378 HD |
685 | /* This should be improooooved!! */ |
686 | return alloc_page(GFP_HIGHUSER_MOVABLE); | |
0c0e6195 KH |
687 | } |
688 | ||
0c0e6195 KH |
689 | #define NR_OFFLINE_AT_ONCE_PAGES (256) |
690 | static int | |
691 | do_migrate_range(unsigned long start_pfn, unsigned long end_pfn) | |
692 | { | |
693 | unsigned long pfn; | |
694 | struct page *page; | |
695 | int move_pages = NR_OFFLINE_AT_ONCE_PAGES; | |
696 | int not_managed = 0; | |
697 | int ret = 0; | |
698 | LIST_HEAD(source); | |
699 | ||
700 | for (pfn = start_pfn; pfn < end_pfn && move_pages > 0; pfn++) { | |
701 | if (!pfn_valid(pfn)) | |
702 | continue; | |
703 | page = pfn_to_page(pfn); | |
704 | if (!page_count(page)) | |
705 | continue; | |
706 | /* | |
707 | * We can skip free pages. And we can only deal with pages on | |
708 | * LRU. | |
709 | */ | |
62695a84 | 710 | ret = isolate_lru_page(page); |
0c0e6195 | 711 | if (!ret) { /* Success */ |
62695a84 | 712 | list_add_tail(&page->lru, &source); |
0c0e6195 | 713 | move_pages--; |
6d9c285a KM |
714 | inc_zone_page_state(page, NR_ISOLATED_ANON + |
715 | page_is_file_cache(page)); | |
716 | ||
0c0e6195 | 717 | } else { |
0c0e6195 | 718 | #ifdef CONFIG_DEBUG_VM |
718a3821 WF |
719 | printk(KERN_ALERT "removing pfn %lx from LRU failed\n", |
720 | pfn); | |
721 | dump_page(page); | |
0c0e6195 | 722 | #endif |
809c4449 BL |
723 | /* Becasue we don't have big zone->lock. we should |
724 | check this again here. */ | |
725 | if (page_count(page)) { | |
726 | not_managed++; | |
f3ab2636 | 727 | ret = -EBUSY; |
809c4449 BL |
728 | break; |
729 | } | |
0c0e6195 KH |
730 | } |
731 | } | |
f3ab2636 BL |
732 | if (!list_empty(&source)) { |
733 | if (not_managed) { | |
734 | putback_lru_pages(&source); | |
735 | goto out; | |
736 | } | |
737 | /* this function returns # of failed pages */ | |
77f1fe6b | 738 | ret = migrate_pages(&source, hotremove_migrate_alloc, 0, |
7f0f2496 | 739 | true, true); |
f3ab2636 | 740 | if (ret) |
0c0e6195 | 741 | putback_lru_pages(&source); |
0c0e6195 | 742 | } |
0c0e6195 KH |
743 | out: |
744 | return ret; | |
745 | } | |
746 | ||
747 | /* | |
748 | * remove from free_area[] and mark all as Reserved. | |
749 | */ | |
750 | static int | |
751 | offline_isolated_pages_cb(unsigned long start, unsigned long nr_pages, | |
752 | void *data) | |
753 | { | |
754 | __offline_isolated_pages(start, start + nr_pages); | |
755 | return 0; | |
756 | } | |
757 | ||
758 | static void | |
759 | offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn) | |
760 | { | |
908eedc6 | 761 | walk_system_ram_range(start_pfn, end_pfn - start_pfn, NULL, |
0c0e6195 KH |
762 | offline_isolated_pages_cb); |
763 | } | |
764 | ||
765 | /* | |
766 | * Check all pages in range, recoreded as memory resource, are isolated. | |
767 | */ | |
768 | static int | |
769 | check_pages_isolated_cb(unsigned long start_pfn, unsigned long nr_pages, | |
770 | void *data) | |
771 | { | |
772 | int ret; | |
773 | long offlined = *(long *)data; | |
774 | ret = test_pages_isolated(start_pfn, start_pfn + nr_pages); | |
775 | offlined = nr_pages; | |
776 | if (!ret) | |
777 | *(long *)data += offlined; | |
778 | return ret; | |
779 | } | |
780 | ||
781 | static long | |
782 | check_pages_isolated(unsigned long start_pfn, unsigned long end_pfn) | |
783 | { | |
784 | long offlined = 0; | |
785 | int ret; | |
786 | ||
908eedc6 | 787 | ret = walk_system_ram_range(start_pfn, end_pfn - start_pfn, &offlined, |
0c0e6195 KH |
788 | check_pages_isolated_cb); |
789 | if (ret < 0) | |
790 | offlined = (long)ret; | |
791 | return offlined; | |
792 | } | |
793 | ||
b4e655a4 | 794 | static int offline_pages(unsigned long start_pfn, |
0c0e6195 KH |
795 | unsigned long end_pfn, unsigned long timeout) |
796 | { | |
797 | unsigned long pfn, nr_pages, expire; | |
798 | long offlined_pages; | |
7b78d335 | 799 | int ret, drain, retry_max, node; |
0c0e6195 | 800 | struct zone *zone; |
7b78d335 | 801 | struct memory_notify arg; |
0c0e6195 KH |
802 | |
803 | BUG_ON(start_pfn >= end_pfn); | |
804 | /* at least, alignment against pageblock is necessary */ | |
805 | if (!IS_ALIGNED(start_pfn, pageblock_nr_pages)) | |
806 | return -EINVAL; | |
807 | if (!IS_ALIGNED(end_pfn, pageblock_nr_pages)) | |
808 | return -EINVAL; | |
809 | /* This makes hotplug much easier...and readable. | |
810 | we assume this for now. .*/ | |
811 | if (!test_pages_in_a_zone(start_pfn, end_pfn)) | |
812 | return -EINVAL; | |
7b78d335 | 813 | |
20d6c96b | 814 | lock_memory_hotplug(); |
6ad696d2 | 815 | |
7b78d335 YG |
816 | zone = page_zone(pfn_to_page(start_pfn)); |
817 | node = zone_to_nid(zone); | |
818 | nr_pages = end_pfn - start_pfn; | |
819 | ||
0c0e6195 KH |
820 | /* set above range as isolated */ |
821 | ret = start_isolate_page_range(start_pfn, end_pfn); | |
822 | if (ret) | |
6ad696d2 | 823 | goto out; |
7b78d335 YG |
824 | |
825 | arg.start_pfn = start_pfn; | |
826 | arg.nr_pages = nr_pages; | |
827 | arg.status_change_nid = -1; | |
828 | if (nr_pages >= node_present_pages(node)) | |
829 | arg.status_change_nid = node; | |
830 | ||
831 | ret = memory_notify(MEM_GOING_OFFLINE, &arg); | |
832 | ret = notifier_to_errno(ret); | |
833 | if (ret) | |
834 | goto failed_removal; | |
835 | ||
0c0e6195 KH |
836 | pfn = start_pfn; |
837 | expire = jiffies + timeout; | |
838 | drain = 0; | |
839 | retry_max = 5; | |
840 | repeat: | |
841 | /* start memory hot removal */ | |
842 | ret = -EAGAIN; | |
843 | if (time_after(jiffies, expire)) | |
844 | goto failed_removal; | |
845 | ret = -EINTR; | |
846 | if (signal_pending(current)) | |
847 | goto failed_removal; | |
848 | ret = 0; | |
849 | if (drain) { | |
850 | lru_add_drain_all(); | |
0c0e6195 | 851 | cond_resched(); |
9f8f2172 | 852 | drain_all_pages(); |
0c0e6195 KH |
853 | } |
854 | ||
855 | pfn = scan_lru_pages(start_pfn, end_pfn); | |
856 | if (pfn) { /* We have page on LRU */ | |
857 | ret = do_migrate_range(pfn, end_pfn); | |
858 | if (!ret) { | |
859 | drain = 1; | |
860 | goto repeat; | |
861 | } else { | |
862 | if (ret < 0) | |
863 | if (--retry_max == 0) | |
864 | goto failed_removal; | |
865 | yield(); | |
866 | drain = 1; | |
867 | goto repeat; | |
868 | } | |
869 | } | |
870 | /* drain all zone's lru pagevec, this is asyncronous... */ | |
871 | lru_add_drain_all(); | |
0c0e6195 KH |
872 | yield(); |
873 | /* drain pcp pages , this is synchrouns. */ | |
9f8f2172 | 874 | drain_all_pages(); |
0c0e6195 KH |
875 | /* check again */ |
876 | offlined_pages = check_pages_isolated(start_pfn, end_pfn); | |
877 | if (offlined_pages < 0) { | |
878 | ret = -EBUSY; | |
879 | goto failed_removal; | |
880 | } | |
881 | printk(KERN_INFO "Offlined Pages %ld\n", offlined_pages); | |
882 | /* Ok, all of our target is islaoted. | |
883 | We cannot do rollback at this point. */ | |
884 | offline_isolated_pages(start_pfn, end_pfn); | |
dbc0e4ce KH |
885 | /* reset pagetype flags and makes migrate type to be MOVABLE */ |
886 | undo_isolate_page_range(start_pfn, end_pfn); | |
0c0e6195 | 887 | /* removal success */ |
0c0e6195 KH |
888 | zone->present_pages -= offlined_pages; |
889 | zone->zone_pgdat->node_present_pages -= offlined_pages; | |
890 | totalram_pages -= offlined_pages; | |
7b78d335 | 891 | |
bce7394a MK |
892 | setup_per_zone_wmarks(); |
893 | calculate_zone_inactive_ratio(zone); | |
8fe23e05 DR |
894 | if (!node_present_pages(node)) { |
895 | node_clear_state(node, N_HIGH_MEMORY); | |
896 | kswapd_stop(node); | |
897 | } | |
bce7394a | 898 | |
0c0e6195 KH |
899 | vm_total_pages = nr_free_pagecache_pages(); |
900 | writeback_set_ratelimit(); | |
7b78d335 YG |
901 | |
902 | memory_notify(MEM_OFFLINE, &arg); | |
20d6c96b | 903 | unlock_memory_hotplug(); |
0c0e6195 KH |
904 | return 0; |
905 | ||
906 | failed_removal: | |
907 | printk(KERN_INFO "memory offlining %lx to %lx failed\n", | |
908 | start_pfn, end_pfn); | |
7b78d335 | 909 | memory_notify(MEM_CANCEL_OFFLINE, &arg); |
0c0e6195 KH |
910 | /* pushback to free area */ |
911 | undo_isolate_page_range(start_pfn, end_pfn); | |
7b78d335 | 912 | |
6ad696d2 | 913 | out: |
20d6c96b | 914 | unlock_memory_hotplug(); |
0c0e6195 KH |
915 | return ret; |
916 | } | |
71088785 BP |
917 | |
918 | int remove_memory(u64 start, u64 size) | |
919 | { | |
920 | unsigned long start_pfn, end_pfn; | |
921 | ||
922 | start_pfn = PFN_DOWN(start); | |
923 | end_pfn = start_pfn + PFN_DOWN(size); | |
924 | return offline_pages(start_pfn, end_pfn, 120 * HZ); | |
925 | } | |
48e94196 KH |
926 | #else |
927 | int remove_memory(u64 start, u64 size) | |
928 | { | |
929 | return -EINVAL; | |
930 | } | |
0c0e6195 | 931 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
71088785 | 932 | EXPORT_SYMBOL_GPL(remove_memory); |