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> | |
b95f1b31 | 14 | #include <linux/export.h> |
3947be19 | 15 | #include <linux/pagevec.h> |
2d1d43f6 | 16 | #include <linux/writeback.h> |
3947be19 DH |
17 | #include <linux/slab.h> |
18 | #include <linux/sysctl.h> | |
19 | #include <linux/cpu.h> | |
20 | #include <linux/memory.h> | |
21 | #include <linux/memory_hotplug.h> | |
22 | #include <linux/highmem.h> | |
23 | #include <linux/vmalloc.h> | |
0a547039 | 24 | #include <linux/ioport.h> |
0c0e6195 KH |
25 | #include <linux/delay.h> |
26 | #include <linux/migrate.h> | |
27 | #include <linux/page-isolation.h> | |
71088785 | 28 | #include <linux/pfn.h> |
6ad696d2 | 29 | #include <linux/suspend.h> |
6d9c285a | 30 | #include <linux/mm_inline.h> |
d96ae530 | 31 | #include <linux/firmware-map.h> |
60a5a19e | 32 | #include <linux/stop_machine.h> |
3947be19 DH |
33 | |
34 | #include <asm/tlbflush.h> | |
35 | ||
1e5ad9a3 AB |
36 | #include "internal.h" |
37 | ||
9d0ad8ca DK |
38 | /* |
39 | * online_page_callback contains pointer to current page onlining function. | |
40 | * Initially it is generic_online_page(). If it is required it could be | |
41 | * changed by calling set_online_page_callback() for callback registration | |
42 | * and restore_online_page_callback() for generic callback restore. | |
43 | */ | |
44 | ||
45 | static void generic_online_page(struct page *page); | |
46 | ||
47 | static online_page_callback_t online_page_callback = generic_online_page; | |
48 | ||
20d6c96b KM |
49 | DEFINE_MUTEX(mem_hotplug_mutex); |
50 | ||
51 | void lock_memory_hotplug(void) | |
52 | { | |
53 | mutex_lock(&mem_hotplug_mutex); | |
54 | ||
55 | /* for exclusive hibernation if CONFIG_HIBERNATION=y */ | |
56 | lock_system_sleep(); | |
57 | } | |
58 | ||
59 | void unlock_memory_hotplug(void) | |
60 | { | |
61 | unlock_system_sleep(); | |
62 | mutex_unlock(&mem_hotplug_mutex); | |
63 | } | |
64 | ||
65 | ||
45e0b78b KM |
66 | /* add this memory to iomem resource */ |
67 | static struct resource *register_memory_resource(u64 start, u64 size) | |
68 | { | |
69 | struct resource *res; | |
70 | res = kzalloc(sizeof(struct resource), GFP_KERNEL); | |
71 | BUG_ON(!res); | |
72 | ||
73 | res->name = "System RAM"; | |
74 | res->start = start; | |
75 | res->end = start + size - 1; | |
887c3cb1 | 76 | res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; |
45e0b78b | 77 | if (request_resource(&iomem_resource, res) < 0) { |
4996eed8 | 78 | pr_debug("System RAM resource %pR cannot be added\n", res); |
45e0b78b KM |
79 | kfree(res); |
80 | res = NULL; | |
81 | } | |
82 | return res; | |
83 | } | |
84 | ||
85 | static void release_memory_resource(struct resource *res) | |
86 | { | |
87 | if (!res) | |
88 | return; | |
89 | release_resource(res); | |
90 | kfree(res); | |
91 | return; | |
92 | } | |
93 | ||
53947027 | 94 | #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE |
46723bfa YI |
95 | void get_page_bootmem(unsigned long info, struct page *page, |
96 | unsigned long type) | |
04753278 | 97 | { |
5f24ce5f | 98 | page->lru.next = (struct list_head *) type; |
04753278 YG |
99 | SetPagePrivate(page); |
100 | set_page_private(page, info); | |
101 | atomic_inc(&page->_count); | |
102 | } | |
103 | ||
170a5a7e | 104 | void put_page_bootmem(struct page *page) |
04753278 | 105 | { |
5f24ce5f | 106 | unsigned long type; |
04753278 | 107 | |
5f24ce5f AA |
108 | type = (unsigned long) page->lru.next; |
109 | BUG_ON(type < MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE || | |
110 | type > MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE); | |
04753278 YG |
111 | |
112 | if (atomic_dec_return(&page->_count) == 1) { | |
113 | ClearPagePrivate(page); | |
114 | set_page_private(page, 0); | |
5f24ce5f | 115 | INIT_LIST_HEAD(&page->lru); |
170a5a7e | 116 | free_reserved_page(page); |
04753278 | 117 | } |
04753278 YG |
118 | } |
119 | ||
46723bfa YI |
120 | #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE |
121 | #ifndef CONFIG_SPARSEMEM_VMEMMAP | |
d92bc318 | 122 | static void register_page_bootmem_info_section(unsigned long start_pfn) |
04753278 YG |
123 | { |
124 | unsigned long *usemap, mapsize, section_nr, i; | |
125 | struct mem_section *ms; | |
126 | struct page *page, *memmap; | |
127 | ||
04753278 YG |
128 | 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++) | |
af370fb8 | 152 | get_page_bootmem(section_nr, page, MIX_SECTION_INFO); |
04753278 YG |
153 | |
154 | } | |
46723bfa YI |
155 | #else /* CONFIG_SPARSEMEM_VMEMMAP */ |
156 | static 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 */ | |
04753278 YG |
181 | |
182 | void 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; | |
c1f19495 | 209 | end_pfn = pgdat_end_pfn(pgdat); |
04753278 | 210 | |
7e9f5eb0 | 211 | /* register section info */ |
f14851af | 212 | 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 | |
7e9f5eb0 | 217 | * reside in some other nodes. |
f14851af | 218 | */ |
219 | if (pfn_valid(pfn) && (pfn_to_nid(pfn) == node)) | |
220 | register_page_bootmem_info_section(pfn); | |
221 | } | |
04753278 | 222 | } |
46723bfa | 223 | #endif /* CONFIG_HAVE_BOOTMEM_INFO_NODE */ |
04753278 | 224 | |
76cdd58e HC |
225 | static 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; | |
712cd386 | 233 | if (!zone->spanned_pages || start_pfn < zone->zone_start_pfn) |
76cdd58e HC |
234 | 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 | ||
511c2aba LJ |
242 | static void resize_zone(struct zone *zone, unsigned long start_pfn, |
243 | unsigned long end_pfn) | |
244 | { | |
245 | zone_span_writelock(zone); | |
246 | ||
e455a9b9 LJ |
247 | 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 | } | |
511c2aba LJ |
258 | |
259 | zone_span_writeunlock(zone); | |
260 | } | |
261 | ||
262 | static 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 | ||
f6bbb78e CS |
273 | /* Can fail with -ENOMEM from allocating a wait table with vmalloc() or |
274 | * alloc_bootmem_node_nopanic() */ | |
275 | static 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 | ||
e455a9b9 | 284 | static int __meminit move_pfn_range_left(struct zone *z1, struct zone *z2, |
511c2aba LJ |
285 | unsigned long start_pfn, unsigned long end_pfn) |
286 | { | |
e455a9b9 | 287 | int ret; |
511c2aba | 288 | unsigned long flags; |
e455a9b9 LJ |
289 | unsigned long z1_start_pfn; |
290 | ||
64dd1b29 CS |
291 | ret = ensure_zone_is_initialized(z1, start_pfn, end_pfn - start_pfn); |
292 | if (ret) | |
293 | return ret; | |
511c2aba LJ |
294 | |
295 | pgdat_resize_lock(z1->zone_pgdat, &flags); | |
296 | ||
297 | /* can't move pfns which are higher than @z2 */ | |
108bcc96 | 298 | if (end_pfn > zone_end_pfn(z2)) |
511c2aba | 299 | goto out_fail; |
834405c3 | 300 | /* the move out part must be at the left most of @z2 */ |
511c2aba LJ |
301 | 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 | ||
e455a9b9 LJ |
307 | /* 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); | |
108bcc96 | 314 | resize_zone(z2, end_pfn, zone_end_pfn(z2)); |
511c2aba LJ |
315 | |
316 | pgdat_resize_unlock(z1->zone_pgdat, &flags); | |
317 | ||
318 | fix_zone_id(z1, start_pfn, end_pfn); | |
319 | ||
320 | return 0; | |
321 | out_fail: | |
322 | pgdat_resize_unlock(z1->zone_pgdat, &flags); | |
323 | return -1; | |
324 | } | |
325 | ||
e455a9b9 | 326 | static int __meminit move_pfn_range_right(struct zone *z1, struct zone *z2, |
511c2aba LJ |
327 | unsigned long start_pfn, unsigned long end_pfn) |
328 | { | |
e455a9b9 | 329 | int ret; |
511c2aba | 330 | unsigned long flags; |
e455a9b9 LJ |
331 | unsigned long z2_end_pfn; |
332 | ||
64dd1b29 CS |
333 | ret = ensure_zone_is_initialized(z2, start_pfn, end_pfn - start_pfn); |
334 | if (ret) | |
335 | return ret; | |
511c2aba LJ |
336 | |
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 */ | |
108bcc96 | 343 | if (zone_end_pfn(z1) > end_pfn) |
511c2aba LJ |
344 | goto out_fail; |
345 | /* must included/overlap */ | |
108bcc96 | 346 | if (start_pfn >= zone_end_pfn(z1)) |
511c2aba LJ |
347 | goto out_fail; |
348 | ||
e455a9b9 LJ |
349 | /* use end_pfn for z2's end_pfn if z2 is empty */ |
350 | if (z2->spanned_pages) | |
108bcc96 | 351 | z2_end_pfn = zone_end_pfn(z2); |
e455a9b9 LJ |
352 | else |
353 | z2_end_pfn = end_pfn; | |
354 | ||
511c2aba | 355 | resize_zone(z1, z1->zone_start_pfn, start_pfn); |
e455a9b9 | 356 | resize_zone(z2, start_pfn, z2_end_pfn); |
511c2aba LJ |
357 | |
358 | pgdat_resize_unlock(z1->zone_pgdat, &flags); | |
359 | ||
360 | fix_zone_id(z2, start_pfn, end_pfn); | |
361 | ||
362 | return 0; | |
363 | out_fail: | |
364 | pgdat_resize_unlock(z1->zone_pgdat, &flags); | |
365 | return -1; | |
366 | } | |
367 | ||
76cdd58e HC |
368 | static 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 | ||
712cd386 | 374 | if (!pgdat->node_spanned_pages || start_pfn < pgdat->node_start_pfn) |
76cdd58e HC |
375 | 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 | ||
31168481 | 381 | static int __meminit __add_zone(struct zone *zone, unsigned long phys_start_pfn) |
3947be19 DH |
382 | { |
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; | |
76cdd58e | 387 | unsigned long flags; |
64dd1b29 | 388 | int ret; |
3947be19 DH |
389 | |
390 | zone_type = zone - pgdat->node_zones; | |
64dd1b29 CS |
391 | ret = ensure_zone_is_initialized(zone, phys_start_pfn, nr_pages); |
392 | if (ret) | |
393 | return ret; | |
76cdd58e | 394 | |
76cdd58e HC |
395 | 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); | |
a2f3aa02 DH |
400 | memmap_init_zone(nr_pages, nid, zone_type, |
401 | phys_start_pfn, MEMMAP_HOTPLUG); | |
718127cc | 402 | return 0; |
3947be19 DH |
403 | } |
404 | ||
c04fc586 GH |
405 | static int __meminit __add_section(int nid, struct zone *zone, |
406 | unsigned long phys_start_pfn) | |
3947be19 | 407 | { |
3947be19 | 408 | int nr_pages = PAGES_PER_SECTION; |
3947be19 DH |
409 | int ret; |
410 | ||
ebd15302 KH |
411 | if (pfn_valid(phys_start_pfn)) |
412 | return -EEXIST; | |
413 | ||
0b0acbec | 414 | ret = sparse_add_one_section(zone, phys_start_pfn, nr_pages); |
3947be19 DH |
415 | |
416 | if (ret < 0) | |
417 | return ret; | |
418 | ||
718127cc YG |
419 | ret = __add_zone(zone, phys_start_pfn); |
420 | ||
421 | if (ret < 0) | |
422 | return ret; | |
423 | ||
c04fc586 | 424 | return register_new_memory(nid, __pfn_to_section(phys_start_pfn)); |
3947be19 DH |
425 | } |
426 | ||
4edd7cef DR |
427 | /* |
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 | */ | |
433 | int __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 | } | |
458 | EXPORT_SYMBOL_GPL(__add_pages); | |
459 | ||
460 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
815121d2 YI |
461 | /* find the smallest valid pfn in the range [start_pfn, end_pfn) */ |
462 | static 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). */ | |
487 | static 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 | ||
514 | static 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 | ||
581 | static 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 | ||
647 | static 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 | ||
ea01ea93 BP |
662 | static int __remove_section(struct zone *zone, struct mem_section *ms) |
663 | { | |
815121d2 YI |
664 | unsigned long start_pfn; |
665 | int scn_nr; | |
ea01ea93 BP |
666 | 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 | ||
815121d2 YI |
675 | scn_nr = __section_nr(ms); |
676 | start_pfn = section_nr_to_pfn(scn_nr); | |
677 | __remove_zone(zone, start_pfn); | |
678 | ||
ea01ea93 | 679 | sparse_remove_one_section(zone, ms); |
ea01ea93 BP |
680 | return 0; |
681 | } | |
682 | ||
ea01ea93 BP |
683 | /** |
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 | */ | |
694 | int __remove_pages(struct zone *zone, unsigned long phys_start_pfn, | |
695 | unsigned long nr_pages) | |
696 | { | |
fe74ebb1 | 697 | unsigned long i; |
ea01ea93 | 698 | int sections_to_remove; |
fe74ebb1 TK |
699 | resource_size_t start, size; |
700 | int ret = 0; | |
ea01ea93 BP |
701 | |
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 | ||
fe74ebb1 TK |
708 | start = phys_start_pfn << PAGE_SHIFT; |
709 | size = nr_pages * PAGE_SIZE; | |
710 | ret = release_mem_region_adjustable(&iomem_resource, start, size); | |
348f9f05 RD |
711 | 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 | } | |
d760afd4 | 717 | |
ea01ea93 BP |
718 | 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 | } | |
727 | EXPORT_SYMBOL_GPL(__remove_pages); | |
4edd7cef | 728 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
ea01ea93 | 729 | |
9d0ad8ca DK |
730 | int set_online_page_callback(online_page_callback_t callback) |
731 | { | |
732 | int rc = -EINVAL; | |
733 | ||
734 | lock_memory_hotplug(); | |
735 | ||
736 | if (online_page_callback == generic_online_page) { | |
737 | online_page_callback = callback; | |
738 | rc = 0; | |
739 | } | |
740 | ||
741 | unlock_memory_hotplug(); | |
742 | ||
743 | return rc; | |
744 | } | |
745 | EXPORT_SYMBOL_GPL(set_online_page_callback); | |
746 | ||
747 | int restore_online_page_callback(online_page_callback_t callback) | |
748 | { | |
749 | int rc = -EINVAL; | |
750 | ||
751 | lock_memory_hotplug(); | |
752 | ||
753 | if (online_page_callback == callback) { | |
754 | online_page_callback = generic_online_page; | |
755 | rc = 0; | |
756 | } | |
757 | ||
758 | unlock_memory_hotplug(); | |
759 | ||
760 | return rc; | |
761 | } | |
762 | EXPORT_SYMBOL_GPL(restore_online_page_callback); | |
763 | ||
764 | void __online_page_set_limits(struct page *page) | |
180c06ef | 765 | { |
9d0ad8ca DK |
766 | } |
767 | EXPORT_SYMBOL_GPL(__online_page_set_limits); | |
768 | ||
769 | void __online_page_increment_counters(struct page *page) | |
770 | { | |
3dcc0571 | 771 | adjust_managed_page_count(page, 1); |
9d0ad8ca DK |
772 | } |
773 | EXPORT_SYMBOL_GPL(__online_page_increment_counters); | |
180c06ef | 774 | |
9d0ad8ca DK |
775 | void __online_page_free(struct page *page) |
776 | { | |
3dcc0571 | 777 | __free_reserved_page(page); |
180c06ef | 778 | } |
9d0ad8ca DK |
779 | EXPORT_SYMBOL_GPL(__online_page_free); |
780 | ||
781 | static 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 | } | |
180c06ef | 787 | |
75884fb1 KH |
788 | static int online_pages_range(unsigned long start_pfn, unsigned long nr_pages, |
789 | void *arg) | |
3947be19 DH |
790 | { |
791 | unsigned long i; | |
75884fb1 KH |
792 | 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); | |
9d0ad8ca | 797 | (*online_page_callback)(page); |
75884fb1 KH |
798 | onlined_pages++; |
799 | } | |
800 | *(unsigned long *)arg = onlined_pages; | |
801 | return 0; | |
802 | } | |
803 | ||
09285af7 | 804 | #ifdef CONFIG_MOVABLE_NODE |
79a4dcef TC |
805 | /* |
806 | * When CONFIG_MOVABLE_NODE, we permit onlining of a node which doesn't have | |
807 | * normal memory. | |
808 | */ | |
09285af7 LJ |
809 | static bool can_online_high_movable(struct zone *zone) |
810 | { | |
811 | return true; | |
812 | } | |
79a4dcef | 813 | #else /* CONFIG_MOVABLE_NODE */ |
74d42d8f LJ |
814 | /* ensure every online node has NORMAL memory */ |
815 | static bool can_online_high_movable(struct zone *zone) | |
816 | { | |
817 | return node_state(zone_to_nid(zone), N_NORMAL_MEMORY); | |
818 | } | |
79a4dcef | 819 | #endif /* CONFIG_MOVABLE_NODE */ |
74d42d8f | 820 | |
d9713679 LJ |
821 | /* check which state of node_states will be changed when online memory */ |
822 | static 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 | /* | |
6715ddf9 LJ |
829 | * 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. | |
d9713679 | 832 | * |
6715ddf9 LJ |
833 | * 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. | |
d9713679 | 836 | */ |
6715ddf9 | 837 | if (N_MEMORY == N_NORMAL_MEMORY) |
d9713679 LJ |
838 | 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 | ||
6715ddf9 LJ |
851 | #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 | ||
d9713679 LJ |
873 | /* |
874 | * if the node don't have memory befor online, we will need to | |
6715ddf9 | 875 | * set the node to node_states[N_MEMORY] after the memory |
d9713679 LJ |
876 | * is online. |
877 | */ | |
6715ddf9 | 878 | if (!node_state(nid, N_MEMORY)) |
d9713679 LJ |
879 | arg->status_change_nid = nid; |
880 | else | |
881 | arg->status_change_nid = -1; | |
882 | } | |
883 | ||
884 | static 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 | ||
6715ddf9 LJ |
889 | if (arg->status_change_nid_high >= 0) |
890 | node_set_state(node, N_HIGH_MEMORY); | |
891 | ||
892 | node_set_state(node, N_MEMORY); | |
d9713679 LJ |
893 | } |
894 | ||
75884fb1 | 895 | |
511c2aba | 896 | int __ref online_pages(unsigned long pfn, unsigned long nr_pages, int online_type) |
75884fb1 | 897 | { |
aa47228a | 898 | unsigned long flags; |
3947be19 DH |
899 | unsigned long onlined_pages = 0; |
900 | struct zone *zone; | |
6811378e | 901 | int need_zonelists_rebuild = 0; |
7b78d335 YG |
902 | int nid; |
903 | int ret; | |
904 | struct memory_notify arg; | |
905 | ||
925268a0 | 906 | lock_memory_hotplug(); |
d9713679 LJ |
907 | /* |
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 | ||
74d42d8f LJ |
914 | if ((zone_idx(zone) > ZONE_NORMAL || online_type == ONLINE_MOVABLE) && |
915 | !can_online_high_movable(zone)) { | |
916 | unlock_memory_hotplug(); | |
0a1be150 | 917 | return -EINVAL; |
74d42d8f LJ |
918 | } |
919 | ||
511c2aba LJ |
920 | 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(); | |
0a1be150 | 923 | return -EINVAL; |
511c2aba LJ |
924 | } |
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(); | |
0a1be150 | 929 | return -EINVAL; |
511c2aba LJ |
930 | } |
931 | } | |
932 | ||
933 | /* Previous code may changed the zone of the pfn range */ | |
934 | zone = page_zone(pfn_to_page(pfn)); | |
935 | ||
7b78d335 YG |
936 | arg.start_pfn = pfn; |
937 | arg.nr_pages = nr_pages; | |
d9713679 | 938 | node_states_check_changes_online(nr_pages, zone, &arg); |
7b78d335 YG |
939 | |
940 | nid = page_to_nid(pfn_to_page(pfn)); | |
3947be19 | 941 | |
7b78d335 YG |
942 | ret = memory_notify(MEM_GOING_ONLINE, &arg); |
943 | ret = notifier_to_errno(ret); | |
944 | if (ret) { | |
945 | memory_notify(MEM_CANCEL_ONLINE, &arg); | |
925268a0 | 946 | unlock_memory_hotplug(); |
7b78d335 YG |
947 | return ret; |
948 | } | |
6811378e YG |
949 | /* |
950 | * 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 | */ | |
4eaf3f64 | 954 | mutex_lock(&zonelists_mutex); |
6dcd73d7 | 955 | if (!populated_zone(zone)) { |
6811378e | 956 | need_zonelists_rebuild = 1; |
6dcd73d7 WC |
957 | build_all_zonelists(NULL, zone); |
958 | } | |
6811378e | 959 | |
908eedc6 | 960 | ret = walk_system_ram_range(pfn, nr_pages, &onlined_pages, |
75884fb1 | 961 | online_pages_range); |
fd8a4221 | 962 | if (ret) { |
6dcd73d7 WC |
963 | if (need_zonelists_rebuild) |
964 | zone_pcp_reset(zone); | |
4eaf3f64 | 965 | mutex_unlock(&zonelists_mutex); |
a62e2f4f BH |
966 | 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); | |
fd8a4221 | 970 | memory_notify(MEM_CANCEL_ONLINE, &arg); |
925268a0 | 971 | unlock_memory_hotplug(); |
fd8a4221 GL |
972 | return ret; |
973 | } | |
974 | ||
3947be19 | 975 | zone->present_pages += onlined_pages; |
aa47228a CS |
976 | |
977 | pgdat_resize_lock(zone->zone_pgdat, &flags); | |
f2937be5 | 978 | zone->zone_pgdat->node_present_pages += onlined_pages; |
aa47228a CS |
979 | pgdat_resize_unlock(zone->zone_pgdat, &flags); |
980 | ||
08dff7b7 | 981 | if (onlined_pages) { |
d9713679 | 982 | node_states_set_node(zone_to_nid(zone), &arg); |
08dff7b7 | 983 | if (need_zonelists_rebuild) |
6dcd73d7 | 984 | build_all_zonelists(NULL, NULL); |
08dff7b7 JL |
985 | else |
986 | zone_pcp_update(zone); | |
987 | } | |
3947be19 | 988 | |
4eaf3f64 | 989 | mutex_unlock(&zonelists_mutex); |
1b79acc9 KM |
990 | |
991 | init_per_zone_wmark_min(); | |
992 | ||
08dff7b7 | 993 | if (onlined_pages) |
7ea1530a | 994 | kswapd_run(zone_to_nid(zone)); |
61b13993 | 995 | |
1f522509 | 996 | vm_total_pages = nr_free_pagecache_pages(); |
2f7f24ec | 997 | |
2d1d43f6 | 998 | writeback_set_ratelimit(); |
7b78d335 YG |
999 | |
1000 | if (onlined_pages) | |
1001 | memory_notify(MEM_ONLINE, &arg); | |
925268a0 | 1002 | unlock_memory_hotplug(); |
7b78d335 | 1003 | |
3947be19 DH |
1004 | return 0; |
1005 | } | |
53947027 | 1006 | #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ |
bc02af93 | 1007 | |
e1319331 HS |
1008 | /* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */ |
1009 | static pg_data_t __ref *hotadd_new_pgdat(int nid, u64 start) | |
9af3c2de YG |
1010 | { |
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 | ||
a1e565aa TC |
1016 | pgdat = NODE_DATA(nid); |
1017 | if (!pgdat) { | |
1018 | pgdat = arch_alloc_nodedata(nid); | |
1019 | if (!pgdat) | |
1020 | return NULL; | |
9af3c2de | 1021 | |
a1e565aa TC |
1022 | arch_refresh_nodedata(nid, pgdat); |
1023 | } | |
9af3c2de YG |
1024 | |
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.*/ | |
9109fb7b | 1028 | free_area_init_node(nid, zones_size, start_pfn, zholes_size); |
9af3c2de | 1029 | |
959ecc48 KH |
1030 | /* |
1031 | * The node we allocated has no zone fallback lists. For avoiding | |
1032 | * to access not-initialized zonelist, build here. | |
1033 | */ | |
f957db4f | 1034 | mutex_lock(&zonelists_mutex); |
9adb62a5 | 1035 | build_all_zonelists(pgdat, NULL); |
f957db4f | 1036 | mutex_unlock(&zonelists_mutex); |
959ecc48 | 1037 | |
9af3c2de YG |
1038 | return pgdat; |
1039 | } | |
1040 | ||
1041 | static 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 | ||
0a547039 | 1048 | |
cf23422b | 1049 | /* |
1050 | * called by cpu_up() to online a node without onlined memory. | |
1051 | */ | |
1052 | int mem_online_node(int nid) | |
1053 | { | |
1054 | pg_data_t *pgdat; | |
1055 | int ret; | |
1056 | ||
20d6c96b | 1057 | lock_memory_hotplug(); |
cf23422b | 1058 | pgdat = hotadd_new_pgdat(nid, 0); |
7553e8f2 | 1059 | if (!pgdat) { |
cf23422b | 1060 | ret = -ENOMEM; |
1061 | goto out; | |
1062 | } | |
1063 | node_set_online(nid); | |
1064 | ret = register_one_node(nid); | |
1065 | BUG_ON(ret); | |
1066 | ||
1067 | out: | |
20d6c96b | 1068 | unlock_memory_hotplug(); |
cf23422b | 1069 | return ret; |
1070 | } | |
1071 | ||
31168481 AV |
1072 | /* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */ |
1073 | int __ref add_memory(int nid, u64 start, u64 size) | |
bc02af93 | 1074 | { |
9af3c2de | 1075 | pg_data_t *pgdat = NULL; |
a1e565aa TC |
1076 | bool new_pgdat; |
1077 | bool new_node; | |
ebd15302 | 1078 | struct resource *res; |
bc02af93 YG |
1079 | int ret; |
1080 | ||
20d6c96b | 1081 | lock_memory_hotplug(); |
6ad696d2 | 1082 | |
ebd15302 | 1083 | res = register_memory_resource(start, size); |
6ad696d2 | 1084 | ret = -EEXIST; |
ebd15302 | 1085 | if (!res) |
6ad696d2 | 1086 | goto out; |
ebd15302 | 1087 | |
a1e565aa TC |
1088 | { /* 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) { | |
9af3c2de | 1094 | pgdat = hotadd_new_pgdat(nid, start); |
6ad696d2 | 1095 | ret = -ENOMEM; |
9af3c2de | 1096 | if (!pgdat) |
41b9e2d7 | 1097 | goto error; |
9af3c2de YG |
1098 | } |
1099 | ||
bc02af93 YG |
1100 | /* call arch's memory hotadd */ |
1101 | ret = arch_add_memory(nid, start, size); | |
1102 | ||
9af3c2de YG |
1103 | if (ret < 0) |
1104 | goto error; | |
1105 | ||
0fc44159 | 1106 | /* we online node here. we can't roll back from here. */ |
9af3c2de YG |
1107 | node_set_online(nid); |
1108 | ||
a1e565aa | 1109 | if (new_node) { |
0fc44159 YG |
1110 | 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 | ||
d96ae530 | 1119 | /* create new memmap entry */ |
1120 | firmware_map_add_hotplug(start, start + size, "System RAM"); | |
1121 | ||
6ad696d2 AK |
1122 | goto out; |
1123 | ||
9af3c2de YG |
1124 | error: |
1125 | /* rollback pgdat allocation and others */ | |
1126 | if (new_pgdat) | |
1127 | rollback_node_hotadd(nid, pgdat); | |
a864b9d0 | 1128 | release_memory_resource(res); |
9af3c2de | 1129 | |
6ad696d2 | 1130 | out: |
20d6c96b | 1131 | unlock_memory_hotplug(); |
bc02af93 YG |
1132 | return ret; |
1133 | } | |
1134 | EXPORT_SYMBOL_GPL(add_memory); | |
0c0e6195 KH |
1135 | |
1136 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
5c755e9f BP |
1137 | /* |
1138 | * 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 | */ | |
1144 | static 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 */ | |
1150 | static struct page *next_active_pageblock(struct page *page) | |
1151 | { | |
5c755e9f BP |
1152 | /* Ensure the starting page is pageblock-aligned */ |
1153 | BUG_ON(page_to_pfn(page) & (pageblock_nr_pages - 1)); | |
1154 | ||
5c755e9f | 1155 | /* If the entire pageblock is free, move to the end of free page */ |
0dcc48c1 KH |
1156 | 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 | } | |
5c755e9f | 1163 | |
0dcc48c1 | 1164 | return page + pageblock_nr_pages; |
5c755e9f BP |
1165 | } |
1166 | ||
1167 | /* Checks if this range of memory is likely to be hot-removable. */ | |
1168 | int is_mem_section_removable(unsigned long start_pfn, unsigned long nr_pages) | |
1169 | { | |
5c755e9f BP |
1170 | 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)) { | |
49ac8255 | 1175 | if (!is_pageblock_removable_nolock(page)) |
5c755e9f | 1176 | return 0; |
49ac8255 | 1177 | cond_resched(); |
5c755e9f BP |
1178 | } |
1179 | ||
1180 | /* All pageblocks in the memory block are likely to be hot-removable */ | |
1181 | return 1; | |
1182 | } | |
1183 | ||
0c0e6195 KH |
1184 | /* |
1185 | * Confirm all pages in a range [start, end) is belongs to the same zone. | |
1186 | */ | |
1187 | static 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 | */ | |
7bbc0905 | 1214 | static unsigned long scan_lru_pages(unsigned long start, unsigned long end) |
0c0e6195 KH |
1215 | { |
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 | ||
0c0e6195 KH |
1228 | #define NR_OFFLINE_AT_ONCE_PAGES (256) |
1229 | static int | |
1230 | do_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); | |
700c2a46 | 1243 | if (!get_page_unless_zero(page)) |
0c0e6195 KH |
1244 | continue; |
1245 | /* | |
1246 | * We can skip free pages. And we can only deal with pages on | |
1247 | * LRU. | |
1248 | */ | |
62695a84 | 1249 | ret = isolate_lru_page(page); |
0c0e6195 | 1250 | if (!ret) { /* Success */ |
700c2a46 | 1251 | put_page(page); |
62695a84 | 1252 | list_add_tail(&page->lru, &source); |
0c0e6195 | 1253 | move_pages--; |
6d9c285a KM |
1254 | inc_zone_page_state(page, NR_ISOLATED_ANON + |
1255 | page_is_file_cache(page)); | |
1256 | ||
0c0e6195 | 1257 | } else { |
0c0e6195 | 1258 | #ifdef CONFIG_DEBUG_VM |
718a3821 WF |
1259 | printk(KERN_ALERT "removing pfn %lx from LRU failed\n", |
1260 | pfn); | |
1261 | dump_page(page); | |
0c0e6195 | 1262 | #endif |
700c2a46 | 1263 | put_page(page); |
25985edc | 1264 | /* Because we don't have big zone->lock. we should |
809c4449 BL |
1265 | check this again here. */ |
1266 | if (page_count(page)) { | |
1267 | not_managed++; | |
f3ab2636 | 1268 | ret = -EBUSY; |
809c4449 BL |
1269 | break; |
1270 | } | |
0c0e6195 KH |
1271 | } |
1272 | } | |
f3ab2636 BL |
1273 | if (!list_empty(&source)) { |
1274 | if (not_managed) { | |
1275 | putback_lru_pages(&source); | |
1276 | goto out; | |
1277 | } | |
74c08f98 MK |
1278 | |
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, | |
9c620e2b | 1284 | MIGRATE_SYNC, MR_MEMORY_HOTPLUG); |
f3ab2636 | 1285 | if (ret) |
0c0e6195 | 1286 | putback_lru_pages(&source); |
0c0e6195 | 1287 | } |
0c0e6195 KH |
1288 | out: |
1289 | return ret; | |
1290 | } | |
1291 | ||
1292 | /* | |
1293 | * remove from free_area[] and mark all as Reserved. | |
1294 | */ | |
1295 | static int | |
1296 | offline_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 | ||
1303 | static void | |
1304 | offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn) | |
1305 | { | |
908eedc6 | 1306 | walk_system_ram_range(start_pfn, end_pfn - start_pfn, NULL, |
0c0e6195 KH |
1307 | offline_isolated_pages_cb); |
1308 | } | |
1309 | ||
1310 | /* | |
1311 | * Check all pages in range, recoreded as memory resource, are isolated. | |
1312 | */ | |
1313 | static int | |
1314 | check_pages_isolated_cb(unsigned long start_pfn, unsigned long nr_pages, | |
1315 | void *data) | |
1316 | { | |
1317 | int ret; | |
1318 | long offlined = *(long *)data; | |
b023f468 | 1319 | ret = test_pages_isolated(start_pfn, start_pfn + nr_pages, true); |
0c0e6195 KH |
1320 | offlined = nr_pages; |
1321 | if (!ret) | |
1322 | *(long *)data += offlined; | |
1323 | return ret; | |
1324 | } | |
1325 | ||
1326 | static long | |
1327 | check_pages_isolated(unsigned long start_pfn, unsigned long end_pfn) | |
1328 | { | |
1329 | long offlined = 0; | |
1330 | int ret; | |
1331 | ||
908eedc6 | 1332 | ret = walk_system_ram_range(start_pfn, end_pfn - start_pfn, &offlined, |
0c0e6195 KH |
1333 | check_pages_isolated_cb); |
1334 | if (ret < 0) | |
1335 | offlined = (long)ret; | |
1336 | return offlined; | |
1337 | } | |
1338 | ||
09285af7 | 1339 | #ifdef CONFIG_MOVABLE_NODE |
79a4dcef TC |
1340 | /* |
1341 | * When CONFIG_MOVABLE_NODE, we permit offlining of a node which doesn't have | |
1342 | * normal memory. | |
1343 | */ | |
09285af7 LJ |
1344 | static bool can_offline_normal(struct zone *zone, unsigned long nr_pages) |
1345 | { | |
1346 | return true; | |
1347 | } | |
79a4dcef | 1348 | #else /* CONFIG_MOVABLE_NODE */ |
74d42d8f LJ |
1349 | /* ensure the node has NORMAL memory if it is still online */ |
1350 | static 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 | } | |
79a4dcef | 1372 | #endif /* CONFIG_MOVABLE_NODE */ |
74d42d8f | 1373 | |
d9713679 LJ |
1374 | /* check which state of node_states will be changed when offline memory */ |
1375 | static 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 | /* | |
6715ddf9 LJ |
1383 | * 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. | |
d9713679 | 1386 | * |
6715ddf9 LJ |
1387 | * 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. | |
d9713679 | 1390 | */ |
6715ddf9 | 1391 | if (N_MEMORY == N_NORMAL_MEMORY) |
d9713679 LJ |
1392 | 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 | ||
6715ddf9 LJ |
1408 | #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 | ||
d9713679 LJ |
1432 | /* |
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 | ||
1451 | static 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 | ||
6715ddf9 LJ |
1456 | if ((N_MEMORY != N_NORMAL_MEMORY) && |
1457 | (arg->status_change_nid_high >= 0)) | |
d9713679 | 1458 | node_clear_state(node, N_HIGH_MEMORY); |
6715ddf9 LJ |
1459 | |
1460 | if ((N_MEMORY != N_HIGH_MEMORY) && | |
1461 | (arg->status_change_nid >= 0)) | |
1462 | node_clear_state(node, N_MEMORY); | |
d9713679 LJ |
1463 | } |
1464 | ||
a16cee10 | 1465 | static int __ref __offline_pages(unsigned long start_pfn, |
0c0e6195 KH |
1466 | unsigned long end_pfn, unsigned long timeout) |
1467 | { | |
1468 | unsigned long pfn, nr_pages, expire; | |
1469 | long offlined_pages; | |
7b78d335 | 1470 | int ret, drain, retry_max, node; |
d702909f | 1471 | unsigned long flags; |
0c0e6195 | 1472 | struct zone *zone; |
7b78d335 | 1473 | struct memory_notify arg; |
0c0e6195 KH |
1474 | |
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; | |
7b78d335 | 1485 | |
20d6c96b | 1486 | lock_memory_hotplug(); |
6ad696d2 | 1487 | |
7b78d335 YG |
1488 | zone = page_zone(pfn_to_page(start_pfn)); |
1489 | node = zone_to_nid(zone); | |
1490 | nr_pages = end_pfn - start_pfn; | |
1491 | ||
74d42d8f LJ |
1492 | ret = -EINVAL; |
1493 | if (zone_idx(zone) <= ZONE_NORMAL && !can_offline_normal(zone, nr_pages)) | |
1494 | goto out; | |
1495 | ||
0c0e6195 | 1496 | /* set above range as isolated */ |
b023f468 WC |
1497 | ret = start_isolate_page_range(start_pfn, end_pfn, |
1498 | MIGRATE_MOVABLE, true); | |
0c0e6195 | 1499 | if (ret) |
6ad696d2 | 1500 | goto out; |
7b78d335 YG |
1501 | |
1502 | arg.start_pfn = start_pfn; | |
1503 | arg.nr_pages = nr_pages; | |
d9713679 | 1504 | node_states_check_changes_offline(nr_pages, zone, &arg); |
7b78d335 YG |
1505 | |
1506 | ret = memory_notify(MEM_GOING_OFFLINE, &arg); | |
1507 | ret = notifier_to_errno(ret); | |
1508 | if (ret) | |
1509 | goto failed_removal; | |
1510 | ||
0c0e6195 KH |
1511 | pfn = start_pfn; |
1512 | expire = jiffies + timeout; | |
1513 | drain = 0; | |
1514 | retry_max = 5; | |
1515 | repeat: | |
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(); | |
0c0e6195 | 1526 | cond_resched(); |
9f8f2172 | 1527 | drain_all_pages(); |
0c0e6195 KH |
1528 | } |
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 | } | |
b3834be5 | 1545 | /* drain all zone's lru pagevec, this is asynchronous... */ |
0c0e6195 | 1546 | lru_add_drain_all(); |
0c0e6195 | 1547 | yield(); |
b3834be5 | 1548 | /* drain pcp pages, this is synchronous. */ |
9f8f2172 | 1549 | drain_all_pages(); |
0c0e6195 KH |
1550 | /* 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); | |
b3834be5 | 1557 | /* Ok, all of our target is isolated. |
0c0e6195 KH |
1558 | We cannot do rollback at this point. */ |
1559 | offline_isolated_pages(start_pfn, end_pfn); | |
dbc0e4ce | 1560 | /* reset pagetype flags and makes migrate type to be MOVABLE */ |
0815f3d8 | 1561 | undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE); |
0c0e6195 | 1562 | /* removal success */ |
3dcc0571 | 1563 | adjust_managed_page_count(pfn_to_page(start_pfn), -offlined_pages); |
0c0e6195 | 1564 | zone->present_pages -= offlined_pages; |
d702909f CS |
1565 | |
1566 | pgdat_resize_lock(zone->zone_pgdat, &flags); | |
0c0e6195 | 1567 | zone->zone_pgdat->node_present_pages -= offlined_pages; |
d702909f | 1568 | pgdat_resize_unlock(zone->zone_pgdat, &flags); |
7b78d335 | 1569 | |
1b79acc9 KM |
1570 | init_per_zone_wmark_min(); |
1571 | ||
1e8537ba | 1572 | if (!populated_zone(zone)) { |
340175b7 | 1573 | zone_pcp_reset(zone); |
1e8537ba XQ |
1574 | mutex_lock(&zonelists_mutex); |
1575 | build_all_zonelists(NULL, NULL); | |
1576 | mutex_unlock(&zonelists_mutex); | |
1577 | } else | |
1578 | zone_pcp_update(zone); | |
340175b7 | 1579 | |
d9713679 LJ |
1580 | node_states_clear_node(node, &arg); |
1581 | if (arg.status_change_nid >= 0) | |
8fe23e05 | 1582 | kswapd_stop(node); |
bce7394a | 1583 | |
0c0e6195 KH |
1584 | vm_total_pages = nr_free_pagecache_pages(); |
1585 | writeback_set_ratelimit(); | |
7b78d335 YG |
1586 | |
1587 | memory_notify(MEM_OFFLINE, &arg); | |
20d6c96b | 1588 | unlock_memory_hotplug(); |
0c0e6195 KH |
1589 | return 0; |
1590 | ||
1591 | failed_removal: | |
a62e2f4f BH |
1592 | 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); | |
7b78d335 | 1595 | memory_notify(MEM_CANCEL_OFFLINE, &arg); |
0c0e6195 | 1596 | /* pushback to free area */ |
0815f3d8 | 1597 | undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE); |
7b78d335 | 1598 | |
6ad696d2 | 1599 | out: |
20d6c96b | 1600 | unlock_memory_hotplug(); |
0c0e6195 KH |
1601 | return ret; |
1602 | } | |
71088785 | 1603 | |
a16cee10 WC |
1604 | int offline_pages(unsigned long start_pfn, unsigned long nr_pages) |
1605 | { | |
1606 | return __offline_pages(start_pfn, start_pfn + nr_pages, 120 * HZ); | |
1607 | } | |
e2ff3940 | 1608 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
a16cee10 | 1609 | |
bbc76be6 WC |
1610 | /** |
1611 | * walk_memory_range - walks through all mem sections in [start_pfn, end_pfn) | |
1612 | * @start_pfn: start pfn of the memory range | |
e05c4bbf | 1613 | * @end_pfn: end pfn of the memory range |
bbc76be6 WC |
1614 | * @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 | */ | |
e2ff3940 | 1622 | int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn, |
bbc76be6 | 1623 | void *arg, int (*func)(struct memory_block *, void *)) |
71088785 | 1624 | { |
e90bdb7f WC |
1625 | struct memory_block *mem = NULL; |
1626 | struct mem_section *section; | |
e90bdb7f WC |
1627 | unsigned long pfn, section_nr; |
1628 | int ret; | |
e90bdb7f WC |
1629 | |
1630 | 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 | ||
bbc76be6 | 1646 | ret = func(mem, arg); |
e90bdb7f | 1647 | if (ret) { |
bbc76be6 WC |
1648 | kobject_put(&mem->dev.kobj); |
1649 | return ret; | |
e90bdb7f WC |
1650 | } |
1651 | } | |
1652 | ||
1653 | if (mem) | |
1654 | kobject_put(&mem->dev.kobj); | |
1655 | ||
bbc76be6 WC |
1656 | return 0; |
1657 | } | |
1658 | ||
e2ff3940 | 1659 | #ifdef CONFIG_MEMORY_HOTREMOVE |
bbc76be6 WC |
1660 | static int is_memblock_offlined_cb(struct memory_block *mem, void *arg) |
1661 | { | |
1662 | int ret = !is_memblock_offlined(mem); | |
1663 | ||
349daa0f RD |
1664 | 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; | |
bbc76be6 | 1669 | pr_warn("removing memory fails, because memory " |
349daa0f RD |
1670 | "[%pa-%pa] is onlined\n", |
1671 | &beginpa, &endpa); | |
1672 | } | |
bbc76be6 WC |
1673 | |
1674 | return ret; | |
1675 | } | |
1676 | ||
60a5a19e TC |
1677 | static 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 | ||
e13fe869 WC |
1694 | static 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 | ||
1706 | static 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 | ||
60a5a19e | 1722 | /* offline the node if all memory sections of this node are removed */ |
90b30cdc | 1723 | void try_offline_node(int nid) |
60a5a19e | 1724 | { |
d822b86a WC |
1725 | 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; | |
60a5a19e | 1728 | unsigned long pfn; |
d822b86a WC |
1729 | struct page *pgdat_page = virt_to_page(pgdat); |
1730 | int i; | |
60a5a19e TC |
1731 | |
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 | ||
e13fe869 | 1748 | if (stop_machine(check_and_unmap_cpu_on_node, pgdat, NULL)) |
60a5a19e TC |
1749 | 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); | |
d822b86a WC |
1757 | |
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 | ||
ca4b3f30 JW |
1766 | /* |
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)) | |
d822b86a WC |
1771 | 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)); | |
60a5a19e | 1782 | } |
90b30cdc | 1783 | EXPORT_SYMBOL(try_offline_node); |
60a5a19e | 1784 | |
242831eb | 1785 | void __ref remove_memory(int nid, u64 start, u64 size) |
bbc76be6 | 1786 | { |
242831eb | 1787 | int ret; |
993c1aad | 1788 | |
6677e3ea YI |
1789 | lock_memory_hotplug(); |
1790 | ||
1791 | /* | |
242831eb RW |
1792 | * 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. | |
6677e3ea | 1795 | */ |
242831eb | 1796 | ret = walk_memory_range(PFN_DOWN(start), PFN_UP(start + size - 1), NULL, |
bbc76be6 WC |
1797 | is_memblock_offlined_cb); |
1798 | if (ret) { | |
1799 | unlock_memory_hotplug(); | |
242831eb | 1800 | BUG(); |
6677e3ea YI |
1801 | } |
1802 | ||
46c66c4b YI |
1803 | /* remove memmap entry */ |
1804 | firmware_map_remove(start, start + size, "System RAM"); | |
1805 | ||
24d335ca WC |
1806 | arch_remove_memory(start, size); |
1807 | ||
60a5a19e TC |
1808 | try_offline_node(nid); |
1809 | ||
6677e3ea | 1810 | unlock_memory_hotplug(); |
71088785 | 1811 | } |
71088785 | 1812 | EXPORT_SYMBOL_GPL(remove_memory); |
aba6efc4 | 1813 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |