Commit | Line | Data |
---|---|---|
3947be19 DH |
1 | /* |
2 | * linux/mm/memory_hotplug.c | |
3 | * | |
4 | * Copyright (C) | |
5 | */ | |
6 | ||
3947be19 DH |
7 | #include <linux/stddef.h> |
8 | #include <linux/mm.h> | |
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 | ||
925268a0 | 412 | lock_memory_hotplug(); |
7b78d335 YG |
413 | arg.start_pfn = pfn; |
414 | arg.nr_pages = nr_pages; | |
415 | arg.status_change_nid = -1; | |
416 | ||
417 | nid = page_to_nid(pfn_to_page(pfn)); | |
418 | if (node_present_pages(nid) == 0) | |
419 | arg.status_change_nid = nid; | |
3947be19 | 420 | |
7b78d335 YG |
421 | ret = memory_notify(MEM_GOING_ONLINE, &arg); |
422 | ret = notifier_to_errno(ret); | |
423 | if (ret) { | |
424 | memory_notify(MEM_CANCEL_ONLINE, &arg); | |
925268a0 | 425 | unlock_memory_hotplug(); |
7b78d335 YG |
426 | return ret; |
427 | } | |
3947be19 DH |
428 | /* |
429 | * This doesn't need a lock to do pfn_to_page(). | |
430 | * The section can't be removed here because of the | |
da19cbcf | 431 | * memory_block->state_mutex. |
3947be19 DH |
432 | */ |
433 | zone = page_zone(pfn_to_page(pfn)); | |
6811378e YG |
434 | /* |
435 | * If this zone is not populated, then it is not in zonelist. | |
436 | * This means the page allocator ignores this zone. | |
437 | * So, zonelist must be updated after online. | |
438 | */ | |
4eaf3f64 | 439 | mutex_lock(&zonelists_mutex); |
6811378e YG |
440 | if (!populated_zone(zone)) |
441 | need_zonelists_rebuild = 1; | |
442 | ||
908eedc6 | 443 | ret = walk_system_ram_range(pfn, nr_pages, &onlined_pages, |
75884fb1 | 444 | online_pages_range); |
fd8a4221 | 445 | if (ret) { |
4eaf3f64 | 446 | mutex_unlock(&zonelists_mutex); |
fd8a4221 GL |
447 | printk(KERN_DEBUG "online_pages %lx at %lx failed\n", |
448 | nr_pages, pfn); | |
449 | memory_notify(MEM_CANCEL_ONLINE, &arg); | |
925268a0 | 450 | unlock_memory_hotplug(); |
fd8a4221 GL |
451 | return ret; |
452 | } | |
453 | ||
3947be19 | 454 | zone->present_pages += onlined_pages; |
f2937be5 | 455 | zone->zone_pgdat->node_present_pages += onlined_pages; |
1f522509 HL |
456 | if (need_zonelists_rebuild) |
457 | build_all_zonelists(zone); | |
458 | else | |
459 | zone_pcp_update(zone); | |
3947be19 | 460 | |
4eaf3f64 | 461 | mutex_unlock(&zonelists_mutex); |
bc75d33f | 462 | setup_per_zone_wmarks(); |
bce7394a | 463 | calculate_zone_inactive_ratio(zone); |
7ea1530a CL |
464 | if (onlined_pages) { |
465 | kswapd_run(zone_to_nid(zone)); | |
466 | node_set_state(zone_to_nid(zone), N_HIGH_MEMORY); | |
467 | } | |
61b13993 | 468 | |
1f522509 | 469 | vm_total_pages = nr_free_pagecache_pages(); |
2f7f24ec | 470 | |
2d1d43f6 | 471 | writeback_set_ratelimit(); |
7b78d335 YG |
472 | |
473 | if (onlined_pages) | |
474 | memory_notify(MEM_ONLINE, &arg); | |
925268a0 | 475 | unlock_memory_hotplug(); |
7b78d335 | 476 | |
3947be19 DH |
477 | return 0; |
478 | } | |
53947027 | 479 | #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ |
bc02af93 | 480 | |
e1319331 HS |
481 | /* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */ |
482 | static pg_data_t __ref *hotadd_new_pgdat(int nid, u64 start) | |
9af3c2de YG |
483 | { |
484 | struct pglist_data *pgdat; | |
485 | unsigned long zones_size[MAX_NR_ZONES] = {0}; | |
486 | unsigned long zholes_size[MAX_NR_ZONES] = {0}; | |
487 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
488 | ||
489 | pgdat = arch_alloc_nodedata(nid); | |
490 | if (!pgdat) | |
491 | return NULL; | |
492 | ||
493 | arch_refresh_nodedata(nid, pgdat); | |
494 | ||
495 | /* we can use NODE_DATA(nid) from here */ | |
496 | ||
497 | /* init node's zones as empty zones, we don't have any present pages.*/ | |
9109fb7b | 498 | free_area_init_node(nid, zones_size, start_pfn, zholes_size); |
9af3c2de YG |
499 | |
500 | return pgdat; | |
501 | } | |
502 | ||
503 | static void rollback_node_hotadd(int nid, pg_data_t *pgdat) | |
504 | { | |
505 | arch_refresh_nodedata(nid, NULL); | |
506 | arch_free_nodedata(pgdat); | |
507 | return; | |
508 | } | |
509 | ||
0a547039 | 510 | |
cf23422b | 511 | /* |
512 | * called by cpu_up() to online a node without onlined memory. | |
513 | */ | |
514 | int mem_online_node(int nid) | |
515 | { | |
516 | pg_data_t *pgdat; | |
517 | int ret; | |
518 | ||
20d6c96b | 519 | lock_memory_hotplug(); |
cf23422b | 520 | pgdat = hotadd_new_pgdat(nid, 0); |
521 | if (pgdat) { | |
522 | ret = -ENOMEM; | |
523 | goto out; | |
524 | } | |
525 | node_set_online(nid); | |
526 | ret = register_one_node(nid); | |
527 | BUG_ON(ret); | |
528 | ||
529 | out: | |
20d6c96b | 530 | unlock_memory_hotplug(); |
cf23422b | 531 | return ret; |
532 | } | |
533 | ||
31168481 AV |
534 | /* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */ |
535 | int __ref add_memory(int nid, u64 start, u64 size) | |
bc02af93 | 536 | { |
9af3c2de YG |
537 | pg_data_t *pgdat = NULL; |
538 | int new_pgdat = 0; | |
ebd15302 | 539 | struct resource *res; |
bc02af93 YG |
540 | int ret; |
541 | ||
20d6c96b | 542 | lock_memory_hotplug(); |
6ad696d2 | 543 | |
ebd15302 | 544 | res = register_memory_resource(start, size); |
6ad696d2 | 545 | ret = -EEXIST; |
ebd15302 | 546 | if (!res) |
6ad696d2 | 547 | goto out; |
ebd15302 | 548 | |
9af3c2de YG |
549 | if (!node_online(nid)) { |
550 | pgdat = hotadd_new_pgdat(nid, start); | |
6ad696d2 | 551 | ret = -ENOMEM; |
9af3c2de | 552 | if (!pgdat) |
6ad696d2 | 553 | goto out; |
9af3c2de | 554 | new_pgdat = 1; |
9af3c2de YG |
555 | } |
556 | ||
bc02af93 YG |
557 | /* call arch's memory hotadd */ |
558 | ret = arch_add_memory(nid, start, size); | |
559 | ||
9af3c2de YG |
560 | if (ret < 0) |
561 | goto error; | |
562 | ||
0fc44159 | 563 | /* we online node here. we can't roll back from here. */ |
9af3c2de YG |
564 | node_set_online(nid); |
565 | ||
0fc44159 YG |
566 | if (new_pgdat) { |
567 | ret = register_one_node(nid); | |
568 | /* | |
569 | * If sysfs file of new node can't create, cpu on the node | |
570 | * can't be hot-added. There is no rollback way now. | |
571 | * So, check by BUG_ON() to catch it reluctantly.. | |
572 | */ | |
573 | BUG_ON(ret); | |
574 | } | |
575 | ||
d96ae530 | 576 | /* create new memmap entry */ |
577 | firmware_map_add_hotplug(start, start + size, "System RAM"); | |
578 | ||
6ad696d2 AK |
579 | goto out; |
580 | ||
9af3c2de YG |
581 | error: |
582 | /* rollback pgdat allocation and others */ | |
583 | if (new_pgdat) | |
584 | rollback_node_hotadd(nid, pgdat); | |
ebd15302 KH |
585 | if (res) |
586 | release_memory_resource(res); | |
9af3c2de | 587 | |
6ad696d2 | 588 | out: |
20d6c96b | 589 | unlock_memory_hotplug(); |
bc02af93 YG |
590 | return ret; |
591 | } | |
592 | EXPORT_SYMBOL_GPL(add_memory); | |
0c0e6195 KH |
593 | |
594 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
5c755e9f BP |
595 | /* |
596 | * A free page on the buddy free lists (not the per-cpu lists) has PageBuddy | |
597 | * set and the size of the free page is given by page_order(). Using this, | |
598 | * the function determines if the pageblock contains only free pages. | |
599 | * Due to buddy contraints, a free page at least the size of a pageblock will | |
600 | * be located at the start of the pageblock | |
601 | */ | |
602 | static inline int pageblock_free(struct page *page) | |
603 | { | |
604 | return PageBuddy(page) && page_order(page) >= pageblock_order; | |
605 | } | |
606 | ||
607 | /* Return the start of the next active pageblock after a given page */ | |
608 | static struct page *next_active_pageblock(struct page *page) | |
609 | { | |
5c755e9f BP |
610 | /* Ensure the starting page is pageblock-aligned */ |
611 | BUG_ON(page_to_pfn(page) & (pageblock_nr_pages - 1)); | |
612 | ||
5c755e9f | 613 | /* If the entire pageblock is free, move to the end of free page */ |
0dcc48c1 KH |
614 | if (pageblock_free(page)) { |
615 | int order; | |
616 | /* be careful. we don't have locks, page_order can be changed.*/ | |
617 | order = page_order(page); | |
618 | if ((order < MAX_ORDER) && (order >= pageblock_order)) | |
619 | return page + (1 << order); | |
620 | } | |
5c755e9f | 621 | |
0dcc48c1 | 622 | return page + pageblock_nr_pages; |
5c755e9f BP |
623 | } |
624 | ||
625 | /* Checks if this range of memory is likely to be hot-removable. */ | |
626 | int is_mem_section_removable(unsigned long start_pfn, unsigned long nr_pages) | |
627 | { | |
5c755e9f BP |
628 | struct page *page = pfn_to_page(start_pfn); |
629 | struct page *end_page = page + nr_pages; | |
630 | ||
631 | /* Check the starting page of each pageblock within the range */ | |
632 | for (; page < end_page; page = next_active_pageblock(page)) { | |
49ac8255 | 633 | if (!is_pageblock_removable_nolock(page)) |
5c755e9f | 634 | return 0; |
49ac8255 | 635 | cond_resched(); |
5c755e9f BP |
636 | } |
637 | ||
638 | /* All pageblocks in the memory block are likely to be hot-removable */ | |
639 | return 1; | |
640 | } | |
641 | ||
0c0e6195 KH |
642 | /* |
643 | * Confirm all pages in a range [start, end) is belongs to the same zone. | |
644 | */ | |
645 | static int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn) | |
646 | { | |
647 | unsigned long pfn; | |
648 | struct zone *zone = NULL; | |
649 | struct page *page; | |
650 | int i; | |
651 | for (pfn = start_pfn; | |
652 | pfn < end_pfn; | |
653 | pfn += MAX_ORDER_NR_PAGES) { | |
654 | i = 0; | |
655 | /* This is just a CONFIG_HOLES_IN_ZONE check.*/ | |
656 | while ((i < MAX_ORDER_NR_PAGES) && !pfn_valid_within(pfn + i)) | |
657 | i++; | |
658 | if (i == MAX_ORDER_NR_PAGES) | |
659 | continue; | |
660 | page = pfn_to_page(pfn + i); | |
661 | if (zone && page_zone(page) != zone) | |
662 | return 0; | |
663 | zone = page_zone(page); | |
664 | } | |
665 | return 1; | |
666 | } | |
667 | ||
668 | /* | |
669 | * Scanning pfn is much easier than scanning lru list. | |
670 | * Scan pfn from start to end and Find LRU page. | |
671 | */ | |
7bbc0905 | 672 | static unsigned long scan_lru_pages(unsigned long start, unsigned long end) |
0c0e6195 KH |
673 | { |
674 | unsigned long pfn; | |
675 | struct page *page; | |
676 | for (pfn = start; pfn < end; pfn++) { | |
677 | if (pfn_valid(pfn)) { | |
678 | page = pfn_to_page(pfn); | |
679 | if (PageLRU(page)) | |
680 | return pfn; | |
681 | } | |
682 | } | |
683 | return 0; | |
684 | } | |
685 | ||
686 | static struct page * | |
3c1d4378 | 687 | hotremove_migrate_alloc(struct page *page, unsigned long private, int **x) |
0c0e6195 | 688 | { |
3c1d4378 HD |
689 | /* This should be improooooved!! */ |
690 | return alloc_page(GFP_HIGHUSER_MOVABLE); | |
0c0e6195 KH |
691 | } |
692 | ||
0c0e6195 KH |
693 | #define NR_OFFLINE_AT_ONCE_PAGES (256) |
694 | static int | |
695 | do_migrate_range(unsigned long start_pfn, unsigned long end_pfn) | |
696 | { | |
697 | unsigned long pfn; | |
698 | struct page *page; | |
699 | int move_pages = NR_OFFLINE_AT_ONCE_PAGES; | |
700 | int not_managed = 0; | |
701 | int ret = 0; | |
702 | LIST_HEAD(source); | |
703 | ||
704 | for (pfn = start_pfn; pfn < end_pfn && move_pages > 0; pfn++) { | |
705 | if (!pfn_valid(pfn)) | |
706 | continue; | |
707 | page = pfn_to_page(pfn); | |
708 | if (!page_count(page)) | |
709 | continue; | |
710 | /* | |
711 | * We can skip free pages. And we can only deal with pages on | |
712 | * LRU. | |
713 | */ | |
62695a84 | 714 | ret = isolate_lru_page(page); |
0c0e6195 | 715 | if (!ret) { /* Success */ |
62695a84 | 716 | list_add_tail(&page->lru, &source); |
0c0e6195 | 717 | move_pages--; |
6d9c285a KM |
718 | inc_zone_page_state(page, NR_ISOLATED_ANON + |
719 | page_is_file_cache(page)); | |
720 | ||
0c0e6195 | 721 | } else { |
0c0e6195 | 722 | #ifdef CONFIG_DEBUG_VM |
718a3821 WF |
723 | printk(KERN_ALERT "removing pfn %lx from LRU failed\n", |
724 | pfn); | |
725 | dump_page(page); | |
0c0e6195 | 726 | #endif |
809c4449 BL |
727 | /* Becasue we don't have big zone->lock. we should |
728 | check this again here. */ | |
729 | if (page_count(page)) { | |
730 | not_managed++; | |
f3ab2636 | 731 | ret = -EBUSY; |
809c4449 BL |
732 | break; |
733 | } | |
0c0e6195 KH |
734 | } |
735 | } | |
f3ab2636 BL |
736 | if (!list_empty(&source)) { |
737 | if (not_managed) { | |
738 | putback_lru_pages(&source); | |
739 | goto out; | |
740 | } | |
741 | /* this function returns # of failed pages */ | |
77f1fe6b | 742 | ret = migrate_pages(&source, hotremove_migrate_alloc, 0, |
7f0f2496 | 743 | true, true); |
f3ab2636 | 744 | if (ret) |
0c0e6195 | 745 | putback_lru_pages(&source); |
0c0e6195 | 746 | } |
0c0e6195 KH |
747 | out: |
748 | return ret; | |
749 | } | |
750 | ||
751 | /* | |
752 | * remove from free_area[] and mark all as Reserved. | |
753 | */ | |
754 | static int | |
755 | offline_isolated_pages_cb(unsigned long start, unsigned long nr_pages, | |
756 | void *data) | |
757 | { | |
758 | __offline_isolated_pages(start, start + nr_pages); | |
759 | return 0; | |
760 | } | |
761 | ||
762 | static void | |
763 | offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn) | |
764 | { | |
908eedc6 | 765 | walk_system_ram_range(start_pfn, end_pfn - start_pfn, NULL, |
0c0e6195 KH |
766 | offline_isolated_pages_cb); |
767 | } | |
768 | ||
769 | /* | |
770 | * Check all pages in range, recoreded as memory resource, are isolated. | |
771 | */ | |
772 | static int | |
773 | check_pages_isolated_cb(unsigned long start_pfn, unsigned long nr_pages, | |
774 | void *data) | |
775 | { | |
776 | int ret; | |
777 | long offlined = *(long *)data; | |
778 | ret = test_pages_isolated(start_pfn, start_pfn + nr_pages); | |
779 | offlined = nr_pages; | |
780 | if (!ret) | |
781 | *(long *)data += offlined; | |
782 | return ret; | |
783 | } | |
784 | ||
785 | static long | |
786 | check_pages_isolated(unsigned long start_pfn, unsigned long end_pfn) | |
787 | { | |
788 | long offlined = 0; | |
789 | int ret; | |
790 | ||
908eedc6 | 791 | ret = walk_system_ram_range(start_pfn, end_pfn - start_pfn, &offlined, |
0c0e6195 KH |
792 | check_pages_isolated_cb); |
793 | if (ret < 0) | |
794 | offlined = (long)ret; | |
795 | return offlined; | |
796 | } | |
797 | ||
b4e655a4 | 798 | static int offline_pages(unsigned long start_pfn, |
0c0e6195 KH |
799 | unsigned long end_pfn, unsigned long timeout) |
800 | { | |
801 | unsigned long pfn, nr_pages, expire; | |
802 | long offlined_pages; | |
7b78d335 | 803 | int ret, drain, retry_max, node; |
0c0e6195 | 804 | struct zone *zone; |
7b78d335 | 805 | struct memory_notify arg; |
0c0e6195 KH |
806 | |
807 | BUG_ON(start_pfn >= end_pfn); | |
808 | /* at least, alignment against pageblock is necessary */ | |
809 | if (!IS_ALIGNED(start_pfn, pageblock_nr_pages)) | |
810 | return -EINVAL; | |
811 | if (!IS_ALIGNED(end_pfn, pageblock_nr_pages)) | |
812 | return -EINVAL; | |
813 | /* This makes hotplug much easier...and readable. | |
814 | we assume this for now. .*/ | |
815 | if (!test_pages_in_a_zone(start_pfn, end_pfn)) | |
816 | return -EINVAL; | |
7b78d335 | 817 | |
20d6c96b | 818 | lock_memory_hotplug(); |
6ad696d2 | 819 | |
7b78d335 YG |
820 | zone = page_zone(pfn_to_page(start_pfn)); |
821 | node = zone_to_nid(zone); | |
822 | nr_pages = end_pfn - start_pfn; | |
823 | ||
0c0e6195 KH |
824 | /* set above range as isolated */ |
825 | ret = start_isolate_page_range(start_pfn, end_pfn); | |
826 | if (ret) | |
6ad696d2 | 827 | goto out; |
7b78d335 YG |
828 | |
829 | arg.start_pfn = start_pfn; | |
830 | arg.nr_pages = nr_pages; | |
831 | arg.status_change_nid = -1; | |
832 | if (nr_pages >= node_present_pages(node)) | |
833 | arg.status_change_nid = node; | |
834 | ||
835 | ret = memory_notify(MEM_GOING_OFFLINE, &arg); | |
836 | ret = notifier_to_errno(ret); | |
837 | if (ret) | |
838 | goto failed_removal; | |
839 | ||
0c0e6195 KH |
840 | pfn = start_pfn; |
841 | expire = jiffies + timeout; | |
842 | drain = 0; | |
843 | retry_max = 5; | |
844 | repeat: | |
845 | /* start memory hot removal */ | |
846 | ret = -EAGAIN; | |
847 | if (time_after(jiffies, expire)) | |
848 | goto failed_removal; | |
849 | ret = -EINTR; | |
850 | if (signal_pending(current)) | |
851 | goto failed_removal; | |
852 | ret = 0; | |
853 | if (drain) { | |
854 | lru_add_drain_all(); | |
0c0e6195 | 855 | cond_resched(); |
9f8f2172 | 856 | drain_all_pages(); |
0c0e6195 KH |
857 | } |
858 | ||
859 | pfn = scan_lru_pages(start_pfn, end_pfn); | |
860 | if (pfn) { /* We have page on LRU */ | |
861 | ret = do_migrate_range(pfn, end_pfn); | |
862 | if (!ret) { | |
863 | drain = 1; | |
864 | goto repeat; | |
865 | } else { | |
866 | if (ret < 0) | |
867 | if (--retry_max == 0) | |
868 | goto failed_removal; | |
869 | yield(); | |
870 | drain = 1; | |
871 | goto repeat; | |
872 | } | |
873 | } | |
874 | /* drain all zone's lru pagevec, this is asyncronous... */ | |
875 | lru_add_drain_all(); | |
0c0e6195 KH |
876 | yield(); |
877 | /* drain pcp pages , this is synchrouns. */ | |
9f8f2172 | 878 | drain_all_pages(); |
0c0e6195 KH |
879 | /* check again */ |
880 | offlined_pages = check_pages_isolated(start_pfn, end_pfn); | |
881 | if (offlined_pages < 0) { | |
882 | ret = -EBUSY; | |
883 | goto failed_removal; | |
884 | } | |
885 | printk(KERN_INFO "Offlined Pages %ld\n", offlined_pages); | |
886 | /* Ok, all of our target is islaoted. | |
887 | We cannot do rollback at this point. */ | |
888 | offline_isolated_pages(start_pfn, end_pfn); | |
dbc0e4ce KH |
889 | /* reset pagetype flags and makes migrate type to be MOVABLE */ |
890 | undo_isolate_page_range(start_pfn, end_pfn); | |
0c0e6195 | 891 | /* removal success */ |
0c0e6195 KH |
892 | zone->present_pages -= offlined_pages; |
893 | zone->zone_pgdat->node_present_pages -= offlined_pages; | |
894 | totalram_pages -= offlined_pages; | |
7b78d335 | 895 | |
bce7394a MK |
896 | setup_per_zone_wmarks(); |
897 | calculate_zone_inactive_ratio(zone); | |
8fe23e05 DR |
898 | if (!node_present_pages(node)) { |
899 | node_clear_state(node, N_HIGH_MEMORY); | |
900 | kswapd_stop(node); | |
901 | } | |
bce7394a | 902 | |
0c0e6195 KH |
903 | vm_total_pages = nr_free_pagecache_pages(); |
904 | writeback_set_ratelimit(); | |
7b78d335 YG |
905 | |
906 | memory_notify(MEM_OFFLINE, &arg); | |
20d6c96b | 907 | unlock_memory_hotplug(); |
0c0e6195 KH |
908 | return 0; |
909 | ||
910 | failed_removal: | |
911 | printk(KERN_INFO "memory offlining %lx to %lx failed\n", | |
912 | start_pfn, end_pfn); | |
7b78d335 | 913 | memory_notify(MEM_CANCEL_OFFLINE, &arg); |
0c0e6195 KH |
914 | /* pushback to free area */ |
915 | undo_isolate_page_range(start_pfn, end_pfn); | |
7b78d335 | 916 | |
6ad696d2 | 917 | out: |
20d6c96b | 918 | unlock_memory_hotplug(); |
0c0e6195 KH |
919 | return ret; |
920 | } | |
71088785 BP |
921 | |
922 | int remove_memory(u64 start, u64 size) | |
923 | { | |
924 | unsigned long start_pfn, end_pfn; | |
925 | ||
926 | start_pfn = PFN_DOWN(start); | |
927 | end_pfn = start_pfn + PFN_DOWN(size); | |
928 | return offline_pages(start_pfn, end_pfn, 120 * HZ); | |
929 | } | |
48e94196 KH |
930 | #else |
931 | int remove_memory(u64 start, u64 size) | |
932 | { | |
933 | return -EINVAL; | |
934 | } | |
0c0e6195 | 935 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
71088785 | 936 | EXPORT_SYMBOL_GPL(remove_memory); |