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> |
c8721bbb | 33 | #include <linux/hugetlb.h> |
c5320926 | 34 | #include <linux/memblock.h> |
3947be19 DH |
35 | |
36 | #include <asm/tlbflush.h> | |
37 | ||
1e5ad9a3 AB |
38 | #include "internal.h" |
39 | ||
9d0ad8ca DK |
40 | /* |
41 | * online_page_callback contains pointer to current page onlining function. | |
42 | * Initially it is generic_online_page(). If it is required it could be | |
43 | * changed by calling set_online_page_callback() for callback registration | |
44 | * and restore_online_page_callback() for generic callback restore. | |
45 | */ | |
46 | ||
47 | static void generic_online_page(struct page *page); | |
48 | ||
49 | static online_page_callback_t online_page_callback = generic_online_page; | |
50 | ||
20d6c96b KM |
51 | DEFINE_MUTEX(mem_hotplug_mutex); |
52 | ||
53 | void lock_memory_hotplug(void) | |
54 | { | |
55 | mutex_lock(&mem_hotplug_mutex); | |
20d6c96b KM |
56 | } |
57 | ||
58 | void unlock_memory_hotplug(void) | |
59 | { | |
20d6c96b KM |
60 | mutex_unlock(&mem_hotplug_mutex); |
61 | } | |
62 | ||
63 | ||
45e0b78b KM |
64 | /* add this memory to iomem resource */ |
65 | static struct resource *register_memory_resource(u64 start, u64 size) | |
66 | { | |
67 | struct resource *res; | |
68 | res = kzalloc(sizeof(struct resource), GFP_KERNEL); | |
69 | BUG_ON(!res); | |
70 | ||
71 | res->name = "System RAM"; | |
72 | res->start = start; | |
73 | res->end = start + size - 1; | |
887c3cb1 | 74 | res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; |
45e0b78b | 75 | if (request_resource(&iomem_resource, res) < 0) { |
4996eed8 | 76 | pr_debug("System RAM resource %pR cannot be added\n", res); |
45e0b78b KM |
77 | kfree(res); |
78 | res = NULL; | |
79 | } | |
80 | return res; | |
81 | } | |
82 | ||
83 | static void release_memory_resource(struct resource *res) | |
84 | { | |
85 | if (!res) | |
86 | return; | |
87 | release_resource(res); | |
88 | kfree(res); | |
89 | return; | |
90 | } | |
91 | ||
53947027 | 92 | #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE |
46723bfa YI |
93 | void get_page_bootmem(unsigned long info, struct page *page, |
94 | unsigned long type) | |
04753278 | 95 | { |
5f24ce5f | 96 | page->lru.next = (struct list_head *) type; |
04753278 YG |
97 | SetPagePrivate(page); |
98 | set_page_private(page, info); | |
99 | atomic_inc(&page->_count); | |
100 | } | |
101 | ||
170a5a7e | 102 | void put_page_bootmem(struct page *page) |
04753278 | 103 | { |
5f24ce5f | 104 | unsigned long type; |
04753278 | 105 | |
5f24ce5f AA |
106 | type = (unsigned long) page->lru.next; |
107 | BUG_ON(type < MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE || | |
108 | type > MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE); | |
04753278 YG |
109 | |
110 | if (atomic_dec_return(&page->_count) == 1) { | |
111 | ClearPagePrivate(page); | |
112 | set_page_private(page, 0); | |
5f24ce5f | 113 | INIT_LIST_HEAD(&page->lru); |
170a5a7e | 114 | free_reserved_page(page); |
04753278 | 115 | } |
04753278 YG |
116 | } |
117 | ||
46723bfa YI |
118 | #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE |
119 | #ifndef CONFIG_SPARSEMEM_VMEMMAP | |
d92bc318 | 120 | static void register_page_bootmem_info_section(unsigned long start_pfn) |
04753278 YG |
121 | { |
122 | unsigned long *usemap, mapsize, section_nr, i; | |
123 | struct mem_section *ms; | |
124 | struct page *page, *memmap; | |
125 | ||
04753278 YG |
126 | section_nr = pfn_to_section_nr(start_pfn); |
127 | ms = __nr_to_section(section_nr); | |
128 | ||
129 | /* Get section's memmap address */ | |
130 | memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); | |
131 | ||
132 | /* | |
133 | * Get page for the memmap's phys address | |
134 | * XXX: need more consideration for sparse_vmemmap... | |
135 | */ | |
136 | page = virt_to_page(memmap); | |
137 | mapsize = sizeof(struct page) * PAGES_PER_SECTION; | |
138 | mapsize = PAGE_ALIGN(mapsize) >> PAGE_SHIFT; | |
139 | ||
140 | /* remember memmap's page */ | |
141 | for (i = 0; i < mapsize; i++, page++) | |
142 | get_page_bootmem(section_nr, page, SECTION_INFO); | |
143 | ||
144 | usemap = __nr_to_section(section_nr)->pageblock_flags; | |
145 | page = virt_to_page(usemap); | |
146 | ||
147 | mapsize = PAGE_ALIGN(usemap_size()) >> PAGE_SHIFT; | |
148 | ||
149 | for (i = 0; i < mapsize; i++, page++) | |
af370fb8 | 150 | get_page_bootmem(section_nr, page, MIX_SECTION_INFO); |
04753278 YG |
151 | |
152 | } | |
46723bfa YI |
153 | #else /* CONFIG_SPARSEMEM_VMEMMAP */ |
154 | static void register_page_bootmem_info_section(unsigned long start_pfn) | |
155 | { | |
156 | unsigned long *usemap, mapsize, section_nr, i; | |
157 | struct mem_section *ms; | |
158 | struct page *page, *memmap; | |
159 | ||
160 | if (!pfn_valid(start_pfn)) | |
161 | return; | |
162 | ||
163 | section_nr = pfn_to_section_nr(start_pfn); | |
164 | ms = __nr_to_section(section_nr); | |
165 | ||
166 | memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); | |
167 | ||
168 | register_page_bootmem_memmap(section_nr, memmap, PAGES_PER_SECTION); | |
169 | ||
170 | usemap = __nr_to_section(section_nr)->pageblock_flags; | |
171 | page = virt_to_page(usemap); | |
172 | ||
173 | mapsize = PAGE_ALIGN(usemap_size()) >> PAGE_SHIFT; | |
174 | ||
175 | for (i = 0; i < mapsize; i++, page++) | |
176 | get_page_bootmem(section_nr, page, MIX_SECTION_INFO); | |
177 | } | |
178 | #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ | |
04753278 YG |
179 | |
180 | void register_page_bootmem_info_node(struct pglist_data *pgdat) | |
181 | { | |
182 | unsigned long i, pfn, end_pfn, nr_pages; | |
183 | int node = pgdat->node_id; | |
184 | struct page *page; | |
185 | struct zone *zone; | |
186 | ||
187 | nr_pages = PAGE_ALIGN(sizeof(struct pglist_data)) >> PAGE_SHIFT; | |
188 | page = virt_to_page(pgdat); | |
189 | ||
190 | for (i = 0; i < nr_pages; i++, page++) | |
191 | get_page_bootmem(node, page, NODE_INFO); | |
192 | ||
193 | zone = &pgdat->node_zones[0]; | |
194 | for (; zone < pgdat->node_zones + MAX_NR_ZONES - 1; zone++) { | |
139c2d75 | 195 | if (zone_is_initialized(zone)) { |
04753278 YG |
196 | nr_pages = zone->wait_table_hash_nr_entries |
197 | * sizeof(wait_queue_head_t); | |
198 | nr_pages = PAGE_ALIGN(nr_pages) >> PAGE_SHIFT; | |
199 | page = virt_to_page(zone->wait_table); | |
200 | ||
201 | for (i = 0; i < nr_pages; i++, page++) | |
202 | get_page_bootmem(node, page, NODE_INFO); | |
203 | } | |
204 | } | |
205 | ||
206 | pfn = pgdat->node_start_pfn; | |
c1f19495 | 207 | end_pfn = pgdat_end_pfn(pgdat); |
04753278 | 208 | |
7e9f5eb0 | 209 | /* register section info */ |
f14851af | 210 | for (; pfn < end_pfn; pfn += PAGES_PER_SECTION) { |
211 | /* | |
212 | * Some platforms can assign the same pfn to multiple nodes - on | |
213 | * node0 as well as nodeN. To avoid registering a pfn against | |
214 | * multiple nodes we check that this pfn does not already | |
7e9f5eb0 | 215 | * reside in some other nodes. |
f14851af | 216 | */ |
217 | if (pfn_valid(pfn) && (pfn_to_nid(pfn) == node)) | |
218 | register_page_bootmem_info_section(pfn); | |
219 | } | |
04753278 | 220 | } |
46723bfa | 221 | #endif /* CONFIG_HAVE_BOOTMEM_INFO_NODE */ |
04753278 | 222 | |
76cdd58e HC |
223 | static void grow_zone_span(struct zone *zone, unsigned long start_pfn, |
224 | unsigned long end_pfn) | |
225 | { | |
226 | unsigned long old_zone_end_pfn; | |
227 | ||
228 | zone_span_writelock(zone); | |
229 | ||
c33bc315 | 230 | old_zone_end_pfn = zone_end_pfn(zone); |
8080fc03 | 231 | if (zone_is_empty(zone) || start_pfn < zone->zone_start_pfn) |
76cdd58e HC |
232 | zone->zone_start_pfn = start_pfn; |
233 | ||
234 | zone->spanned_pages = max(old_zone_end_pfn, end_pfn) - | |
235 | zone->zone_start_pfn; | |
236 | ||
237 | zone_span_writeunlock(zone); | |
238 | } | |
239 | ||
511c2aba LJ |
240 | static void resize_zone(struct zone *zone, unsigned long start_pfn, |
241 | unsigned long end_pfn) | |
242 | { | |
243 | zone_span_writelock(zone); | |
244 | ||
e455a9b9 LJ |
245 | if (end_pfn - start_pfn) { |
246 | zone->zone_start_pfn = start_pfn; | |
247 | zone->spanned_pages = end_pfn - start_pfn; | |
248 | } else { | |
249 | /* | |
250 | * make it consist as free_area_init_core(), | |
251 | * if spanned_pages = 0, then keep start_pfn = 0 | |
252 | */ | |
253 | zone->zone_start_pfn = 0; | |
254 | zone->spanned_pages = 0; | |
255 | } | |
511c2aba LJ |
256 | |
257 | zone_span_writeunlock(zone); | |
258 | } | |
259 | ||
260 | static void fix_zone_id(struct zone *zone, unsigned long start_pfn, | |
261 | unsigned long end_pfn) | |
262 | { | |
263 | enum zone_type zid = zone_idx(zone); | |
264 | int nid = zone->zone_pgdat->node_id; | |
265 | unsigned long pfn; | |
266 | ||
267 | for (pfn = start_pfn; pfn < end_pfn; pfn++) | |
268 | set_page_links(pfn_to_page(pfn), zid, nid, pfn); | |
269 | } | |
270 | ||
f6bbb78e CS |
271 | /* Can fail with -ENOMEM from allocating a wait table with vmalloc() or |
272 | * alloc_bootmem_node_nopanic() */ | |
273 | static int __ref ensure_zone_is_initialized(struct zone *zone, | |
274 | unsigned long start_pfn, unsigned long num_pages) | |
275 | { | |
276 | if (!zone_is_initialized(zone)) | |
277 | return init_currently_empty_zone(zone, start_pfn, num_pages, | |
278 | MEMMAP_HOTPLUG); | |
279 | return 0; | |
280 | } | |
281 | ||
e455a9b9 | 282 | static int __meminit move_pfn_range_left(struct zone *z1, struct zone *z2, |
511c2aba LJ |
283 | unsigned long start_pfn, unsigned long end_pfn) |
284 | { | |
e455a9b9 | 285 | int ret; |
511c2aba | 286 | unsigned long flags; |
e455a9b9 LJ |
287 | unsigned long z1_start_pfn; |
288 | ||
64dd1b29 CS |
289 | ret = ensure_zone_is_initialized(z1, start_pfn, end_pfn - start_pfn); |
290 | if (ret) | |
291 | return ret; | |
511c2aba LJ |
292 | |
293 | pgdat_resize_lock(z1->zone_pgdat, &flags); | |
294 | ||
295 | /* can't move pfns which are higher than @z2 */ | |
108bcc96 | 296 | if (end_pfn > zone_end_pfn(z2)) |
511c2aba | 297 | goto out_fail; |
834405c3 | 298 | /* the move out part must be at the left most of @z2 */ |
511c2aba LJ |
299 | if (start_pfn > z2->zone_start_pfn) |
300 | goto out_fail; | |
301 | /* must included/overlap */ | |
302 | if (end_pfn <= z2->zone_start_pfn) | |
303 | goto out_fail; | |
304 | ||
e455a9b9 | 305 | /* use start_pfn for z1's start_pfn if z1 is empty */ |
8080fc03 | 306 | if (!zone_is_empty(z1)) |
e455a9b9 LJ |
307 | z1_start_pfn = z1->zone_start_pfn; |
308 | else | |
309 | z1_start_pfn = start_pfn; | |
310 | ||
311 | resize_zone(z1, z1_start_pfn, end_pfn); | |
108bcc96 | 312 | resize_zone(z2, end_pfn, zone_end_pfn(z2)); |
511c2aba LJ |
313 | |
314 | pgdat_resize_unlock(z1->zone_pgdat, &flags); | |
315 | ||
316 | fix_zone_id(z1, start_pfn, end_pfn); | |
317 | ||
318 | return 0; | |
319 | out_fail: | |
320 | pgdat_resize_unlock(z1->zone_pgdat, &flags); | |
321 | return -1; | |
322 | } | |
323 | ||
e455a9b9 | 324 | static int __meminit move_pfn_range_right(struct zone *z1, struct zone *z2, |
511c2aba LJ |
325 | unsigned long start_pfn, unsigned long end_pfn) |
326 | { | |
e455a9b9 | 327 | int ret; |
511c2aba | 328 | unsigned long flags; |
e455a9b9 LJ |
329 | unsigned long z2_end_pfn; |
330 | ||
64dd1b29 CS |
331 | ret = ensure_zone_is_initialized(z2, start_pfn, end_pfn - start_pfn); |
332 | if (ret) | |
333 | return ret; | |
511c2aba LJ |
334 | |
335 | pgdat_resize_lock(z1->zone_pgdat, &flags); | |
336 | ||
337 | /* can't move pfns which are lower than @z1 */ | |
338 | if (z1->zone_start_pfn > start_pfn) | |
339 | goto out_fail; | |
340 | /* the move out part mast at the right most of @z1 */ | |
108bcc96 | 341 | if (zone_end_pfn(z1) > end_pfn) |
511c2aba LJ |
342 | goto out_fail; |
343 | /* must included/overlap */ | |
108bcc96 | 344 | if (start_pfn >= zone_end_pfn(z1)) |
511c2aba LJ |
345 | goto out_fail; |
346 | ||
e455a9b9 | 347 | /* use end_pfn for z2's end_pfn if z2 is empty */ |
8080fc03 | 348 | if (!zone_is_empty(z2)) |
108bcc96 | 349 | z2_end_pfn = zone_end_pfn(z2); |
e455a9b9 LJ |
350 | else |
351 | z2_end_pfn = end_pfn; | |
352 | ||
511c2aba | 353 | resize_zone(z1, z1->zone_start_pfn, start_pfn); |
e455a9b9 | 354 | resize_zone(z2, start_pfn, z2_end_pfn); |
511c2aba LJ |
355 | |
356 | pgdat_resize_unlock(z1->zone_pgdat, &flags); | |
357 | ||
358 | fix_zone_id(z2, start_pfn, end_pfn); | |
359 | ||
360 | return 0; | |
361 | out_fail: | |
362 | pgdat_resize_unlock(z1->zone_pgdat, &flags); | |
363 | return -1; | |
364 | } | |
365 | ||
76cdd58e HC |
366 | static void grow_pgdat_span(struct pglist_data *pgdat, unsigned long start_pfn, |
367 | unsigned long end_pfn) | |
368 | { | |
83285c72 | 369 | unsigned long old_pgdat_end_pfn = pgdat_end_pfn(pgdat); |
76cdd58e | 370 | |
712cd386 | 371 | if (!pgdat->node_spanned_pages || start_pfn < pgdat->node_start_pfn) |
76cdd58e HC |
372 | pgdat->node_start_pfn = start_pfn; |
373 | ||
374 | pgdat->node_spanned_pages = max(old_pgdat_end_pfn, end_pfn) - | |
375 | pgdat->node_start_pfn; | |
376 | } | |
377 | ||
31168481 | 378 | static int __meminit __add_zone(struct zone *zone, unsigned long phys_start_pfn) |
3947be19 DH |
379 | { |
380 | struct pglist_data *pgdat = zone->zone_pgdat; | |
381 | int nr_pages = PAGES_PER_SECTION; | |
382 | int nid = pgdat->node_id; | |
383 | int zone_type; | |
76cdd58e | 384 | unsigned long flags; |
64dd1b29 | 385 | int ret; |
3947be19 DH |
386 | |
387 | zone_type = zone - pgdat->node_zones; | |
64dd1b29 CS |
388 | ret = ensure_zone_is_initialized(zone, phys_start_pfn, nr_pages); |
389 | if (ret) | |
390 | return ret; | |
76cdd58e | 391 | |
76cdd58e HC |
392 | pgdat_resize_lock(zone->zone_pgdat, &flags); |
393 | grow_zone_span(zone, phys_start_pfn, phys_start_pfn + nr_pages); | |
394 | grow_pgdat_span(zone->zone_pgdat, phys_start_pfn, | |
395 | phys_start_pfn + nr_pages); | |
396 | pgdat_resize_unlock(zone->zone_pgdat, &flags); | |
a2f3aa02 DH |
397 | memmap_init_zone(nr_pages, nid, zone_type, |
398 | phys_start_pfn, MEMMAP_HOTPLUG); | |
718127cc | 399 | return 0; |
3947be19 DH |
400 | } |
401 | ||
c04fc586 GH |
402 | static int __meminit __add_section(int nid, struct zone *zone, |
403 | unsigned long phys_start_pfn) | |
3947be19 | 404 | { |
3947be19 DH |
405 | int ret; |
406 | ||
ebd15302 KH |
407 | if (pfn_valid(phys_start_pfn)) |
408 | return -EEXIST; | |
409 | ||
85b35fea | 410 | ret = sparse_add_one_section(zone, phys_start_pfn); |
3947be19 DH |
411 | |
412 | if (ret < 0) | |
413 | return ret; | |
414 | ||
718127cc YG |
415 | ret = __add_zone(zone, phys_start_pfn); |
416 | ||
417 | if (ret < 0) | |
418 | return ret; | |
419 | ||
c04fc586 | 420 | return register_new_memory(nid, __pfn_to_section(phys_start_pfn)); |
3947be19 DH |
421 | } |
422 | ||
4edd7cef DR |
423 | /* |
424 | * Reasonably generic function for adding memory. It is | |
425 | * expected that archs that support memory hotplug will | |
426 | * call this function after deciding the zone to which to | |
427 | * add the new pages. | |
428 | */ | |
429 | int __ref __add_pages(int nid, struct zone *zone, unsigned long phys_start_pfn, | |
430 | unsigned long nr_pages) | |
431 | { | |
432 | unsigned long i; | |
433 | int err = 0; | |
434 | int start_sec, end_sec; | |
435 | /* during initialize mem_map, align hot-added range to section */ | |
436 | start_sec = pfn_to_section_nr(phys_start_pfn); | |
437 | end_sec = pfn_to_section_nr(phys_start_pfn + nr_pages - 1); | |
438 | ||
439 | for (i = start_sec; i <= end_sec; i++) { | |
440 | err = __add_section(nid, zone, i << PFN_SECTION_SHIFT); | |
441 | ||
442 | /* | |
443 | * EEXIST is finally dealt with by ioresource collision | |
444 | * check. see add_memory() => register_memory_resource() | |
445 | * Warning will be printed if there is collision. | |
446 | */ | |
447 | if (err && (err != -EEXIST)) | |
448 | break; | |
449 | err = 0; | |
450 | } | |
451 | ||
452 | return err; | |
453 | } | |
454 | EXPORT_SYMBOL_GPL(__add_pages); | |
455 | ||
456 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
815121d2 YI |
457 | /* find the smallest valid pfn in the range [start_pfn, end_pfn) */ |
458 | static int find_smallest_section_pfn(int nid, struct zone *zone, | |
459 | unsigned long start_pfn, | |
460 | unsigned long end_pfn) | |
461 | { | |
462 | struct mem_section *ms; | |
463 | ||
464 | for (; start_pfn < end_pfn; start_pfn += PAGES_PER_SECTION) { | |
465 | ms = __pfn_to_section(start_pfn); | |
466 | ||
467 | if (unlikely(!valid_section(ms))) | |
468 | continue; | |
469 | ||
470 | if (unlikely(pfn_to_nid(start_pfn) != nid)) | |
471 | continue; | |
472 | ||
473 | if (zone && zone != page_zone(pfn_to_page(start_pfn))) | |
474 | continue; | |
475 | ||
476 | return start_pfn; | |
477 | } | |
478 | ||
479 | return 0; | |
480 | } | |
481 | ||
482 | /* find the biggest valid pfn in the range [start_pfn, end_pfn). */ | |
483 | static int find_biggest_section_pfn(int nid, struct zone *zone, | |
484 | unsigned long start_pfn, | |
485 | unsigned long end_pfn) | |
486 | { | |
487 | struct mem_section *ms; | |
488 | unsigned long pfn; | |
489 | ||
490 | /* pfn is the end pfn of a memory section. */ | |
491 | pfn = end_pfn - 1; | |
492 | for (; pfn >= start_pfn; pfn -= PAGES_PER_SECTION) { | |
493 | ms = __pfn_to_section(pfn); | |
494 | ||
495 | if (unlikely(!valid_section(ms))) | |
496 | continue; | |
497 | ||
498 | if (unlikely(pfn_to_nid(pfn) != nid)) | |
499 | continue; | |
500 | ||
501 | if (zone && zone != page_zone(pfn_to_page(pfn))) | |
502 | continue; | |
503 | ||
504 | return pfn; | |
505 | } | |
506 | ||
507 | return 0; | |
508 | } | |
509 | ||
510 | static void shrink_zone_span(struct zone *zone, unsigned long start_pfn, | |
511 | unsigned long end_pfn) | |
512 | { | |
c33bc315 XQ |
513 | unsigned long zone_start_pfn = zone->zone_start_pfn; |
514 | unsigned long z = zone_end_pfn(zone); /* zone_end_pfn namespace clash */ | |
515 | unsigned long zone_end_pfn = z; | |
815121d2 YI |
516 | unsigned long pfn; |
517 | struct mem_section *ms; | |
518 | int nid = zone_to_nid(zone); | |
519 | ||
520 | zone_span_writelock(zone); | |
521 | if (zone_start_pfn == start_pfn) { | |
522 | /* | |
523 | * If the section is smallest section in the zone, it need | |
524 | * shrink zone->zone_start_pfn and zone->zone_spanned_pages. | |
525 | * In this case, we find second smallest valid mem_section | |
526 | * for shrinking zone. | |
527 | */ | |
528 | pfn = find_smallest_section_pfn(nid, zone, end_pfn, | |
529 | zone_end_pfn); | |
530 | if (pfn) { | |
531 | zone->zone_start_pfn = pfn; | |
532 | zone->spanned_pages = zone_end_pfn - pfn; | |
533 | } | |
534 | } else if (zone_end_pfn == end_pfn) { | |
535 | /* | |
536 | * If the section is biggest section in the zone, it need | |
537 | * shrink zone->spanned_pages. | |
538 | * In this case, we find second biggest valid mem_section for | |
539 | * shrinking zone. | |
540 | */ | |
541 | pfn = find_biggest_section_pfn(nid, zone, zone_start_pfn, | |
542 | start_pfn); | |
543 | if (pfn) | |
544 | zone->spanned_pages = pfn - zone_start_pfn + 1; | |
545 | } | |
546 | ||
547 | /* | |
548 | * The section is not biggest or smallest mem_section in the zone, it | |
549 | * only creates a hole in the zone. So in this case, we need not | |
550 | * change the zone. But perhaps, the zone has only hole data. Thus | |
551 | * it check the zone has only hole or not. | |
552 | */ | |
553 | pfn = zone_start_pfn; | |
554 | for (; pfn < zone_end_pfn; pfn += PAGES_PER_SECTION) { | |
555 | ms = __pfn_to_section(pfn); | |
556 | ||
557 | if (unlikely(!valid_section(ms))) | |
558 | continue; | |
559 | ||
560 | if (page_zone(pfn_to_page(pfn)) != zone) | |
561 | continue; | |
562 | ||
563 | /* If the section is current section, it continues the loop */ | |
564 | if (start_pfn == pfn) | |
565 | continue; | |
566 | ||
567 | /* If we find valid section, we have nothing to do */ | |
568 | zone_span_writeunlock(zone); | |
569 | return; | |
570 | } | |
571 | ||
572 | /* The zone has no valid section */ | |
573 | zone->zone_start_pfn = 0; | |
574 | zone->spanned_pages = 0; | |
575 | zone_span_writeunlock(zone); | |
576 | } | |
577 | ||
578 | static void shrink_pgdat_span(struct pglist_data *pgdat, | |
579 | unsigned long start_pfn, unsigned long end_pfn) | |
580 | { | |
83285c72 XQ |
581 | unsigned long pgdat_start_pfn = pgdat->node_start_pfn; |
582 | unsigned long p = pgdat_end_pfn(pgdat); /* pgdat_end_pfn namespace clash */ | |
583 | unsigned long pgdat_end_pfn = p; | |
815121d2 YI |
584 | unsigned long pfn; |
585 | struct mem_section *ms; | |
586 | int nid = pgdat->node_id; | |
587 | ||
588 | if (pgdat_start_pfn == start_pfn) { | |
589 | /* | |
590 | * If the section is smallest section in the pgdat, it need | |
591 | * shrink pgdat->node_start_pfn and pgdat->node_spanned_pages. | |
592 | * In this case, we find second smallest valid mem_section | |
593 | * for shrinking zone. | |
594 | */ | |
595 | pfn = find_smallest_section_pfn(nid, NULL, end_pfn, | |
596 | pgdat_end_pfn); | |
597 | if (pfn) { | |
598 | pgdat->node_start_pfn = pfn; | |
599 | pgdat->node_spanned_pages = pgdat_end_pfn - pfn; | |
600 | } | |
601 | } else if (pgdat_end_pfn == end_pfn) { | |
602 | /* | |
603 | * If the section is biggest section in the pgdat, it need | |
604 | * shrink pgdat->node_spanned_pages. | |
605 | * In this case, we find second biggest valid mem_section for | |
606 | * shrinking zone. | |
607 | */ | |
608 | pfn = find_biggest_section_pfn(nid, NULL, pgdat_start_pfn, | |
609 | start_pfn); | |
610 | if (pfn) | |
611 | pgdat->node_spanned_pages = pfn - pgdat_start_pfn + 1; | |
612 | } | |
613 | ||
614 | /* | |
615 | * If the section is not biggest or smallest mem_section in the pgdat, | |
616 | * it only creates a hole in the pgdat. So in this case, we need not | |
617 | * change the pgdat. | |
618 | * But perhaps, the pgdat has only hole data. Thus it check the pgdat | |
619 | * has only hole or not. | |
620 | */ | |
621 | pfn = pgdat_start_pfn; | |
622 | for (; pfn < pgdat_end_pfn; pfn += PAGES_PER_SECTION) { | |
623 | ms = __pfn_to_section(pfn); | |
624 | ||
625 | if (unlikely(!valid_section(ms))) | |
626 | continue; | |
627 | ||
628 | if (pfn_to_nid(pfn) != nid) | |
629 | continue; | |
630 | ||
631 | /* If the section is current section, it continues the loop */ | |
632 | if (start_pfn == pfn) | |
633 | continue; | |
634 | ||
635 | /* If we find valid section, we have nothing to do */ | |
636 | return; | |
637 | } | |
638 | ||
639 | /* The pgdat has no valid section */ | |
640 | pgdat->node_start_pfn = 0; | |
641 | pgdat->node_spanned_pages = 0; | |
642 | } | |
643 | ||
644 | static void __remove_zone(struct zone *zone, unsigned long start_pfn) | |
645 | { | |
646 | struct pglist_data *pgdat = zone->zone_pgdat; | |
647 | int nr_pages = PAGES_PER_SECTION; | |
648 | int zone_type; | |
649 | unsigned long flags; | |
650 | ||
651 | zone_type = zone - pgdat->node_zones; | |
652 | ||
653 | pgdat_resize_lock(zone->zone_pgdat, &flags); | |
654 | shrink_zone_span(zone, start_pfn, start_pfn + nr_pages); | |
655 | shrink_pgdat_span(pgdat, start_pfn, start_pfn + nr_pages); | |
656 | pgdat_resize_unlock(zone->zone_pgdat, &flags); | |
657 | } | |
658 | ||
ea01ea93 BP |
659 | static int __remove_section(struct zone *zone, struct mem_section *ms) |
660 | { | |
815121d2 YI |
661 | unsigned long start_pfn; |
662 | int scn_nr; | |
ea01ea93 BP |
663 | int ret = -EINVAL; |
664 | ||
665 | if (!valid_section(ms)) | |
666 | return ret; | |
667 | ||
668 | ret = unregister_memory_section(ms); | |
669 | if (ret) | |
670 | return ret; | |
671 | ||
815121d2 YI |
672 | scn_nr = __section_nr(ms); |
673 | start_pfn = section_nr_to_pfn(scn_nr); | |
674 | __remove_zone(zone, start_pfn); | |
675 | ||
ea01ea93 | 676 | sparse_remove_one_section(zone, ms); |
ea01ea93 BP |
677 | return 0; |
678 | } | |
679 | ||
ea01ea93 BP |
680 | /** |
681 | * __remove_pages() - remove sections of pages from a zone | |
682 | * @zone: zone from which pages need to be removed | |
683 | * @phys_start_pfn: starting pageframe (must be aligned to start of a section) | |
684 | * @nr_pages: number of pages to remove (must be multiple of section size) | |
685 | * | |
686 | * Generic helper function to remove section mappings and sysfs entries | |
687 | * for the section of the memory we are removing. Caller needs to make | |
688 | * sure that pages are marked reserved and zones are adjust properly by | |
689 | * calling offline_pages(). | |
690 | */ | |
691 | int __remove_pages(struct zone *zone, unsigned long phys_start_pfn, | |
692 | unsigned long nr_pages) | |
693 | { | |
fe74ebb1 | 694 | unsigned long i; |
ea01ea93 | 695 | int sections_to_remove; |
fe74ebb1 TK |
696 | resource_size_t start, size; |
697 | int ret = 0; | |
ea01ea93 BP |
698 | |
699 | /* | |
700 | * We can only remove entire sections | |
701 | */ | |
702 | BUG_ON(phys_start_pfn & ~PAGE_SECTION_MASK); | |
703 | BUG_ON(nr_pages % PAGES_PER_SECTION); | |
704 | ||
fe74ebb1 TK |
705 | start = phys_start_pfn << PAGE_SHIFT; |
706 | size = nr_pages * PAGE_SIZE; | |
707 | ret = release_mem_region_adjustable(&iomem_resource, start, size); | |
348f9f05 RD |
708 | if (ret) { |
709 | resource_size_t endres = start + size - 1; | |
710 | ||
711 | pr_warn("Unable to release resource <%pa-%pa> (%d)\n", | |
712 | &start, &endres, ret); | |
713 | } | |
d760afd4 | 714 | |
ea01ea93 BP |
715 | sections_to_remove = nr_pages / PAGES_PER_SECTION; |
716 | for (i = 0; i < sections_to_remove; i++) { | |
717 | unsigned long pfn = phys_start_pfn + i*PAGES_PER_SECTION; | |
718 | ret = __remove_section(zone, __pfn_to_section(pfn)); | |
719 | if (ret) | |
720 | break; | |
721 | } | |
722 | return ret; | |
723 | } | |
724 | EXPORT_SYMBOL_GPL(__remove_pages); | |
4edd7cef | 725 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
ea01ea93 | 726 | |
9d0ad8ca DK |
727 | int set_online_page_callback(online_page_callback_t callback) |
728 | { | |
729 | int rc = -EINVAL; | |
730 | ||
731 | lock_memory_hotplug(); | |
732 | ||
733 | if (online_page_callback == generic_online_page) { | |
734 | online_page_callback = callback; | |
735 | rc = 0; | |
736 | } | |
737 | ||
738 | unlock_memory_hotplug(); | |
739 | ||
740 | return rc; | |
741 | } | |
742 | EXPORT_SYMBOL_GPL(set_online_page_callback); | |
743 | ||
744 | int restore_online_page_callback(online_page_callback_t callback) | |
745 | { | |
746 | int rc = -EINVAL; | |
747 | ||
748 | lock_memory_hotplug(); | |
749 | ||
750 | if (online_page_callback == callback) { | |
751 | online_page_callback = generic_online_page; | |
752 | rc = 0; | |
753 | } | |
754 | ||
755 | unlock_memory_hotplug(); | |
756 | ||
757 | return rc; | |
758 | } | |
759 | EXPORT_SYMBOL_GPL(restore_online_page_callback); | |
760 | ||
761 | void __online_page_set_limits(struct page *page) | |
180c06ef | 762 | { |
9d0ad8ca DK |
763 | } |
764 | EXPORT_SYMBOL_GPL(__online_page_set_limits); | |
765 | ||
766 | void __online_page_increment_counters(struct page *page) | |
767 | { | |
3dcc0571 | 768 | adjust_managed_page_count(page, 1); |
9d0ad8ca DK |
769 | } |
770 | EXPORT_SYMBOL_GPL(__online_page_increment_counters); | |
180c06ef | 771 | |
9d0ad8ca DK |
772 | void __online_page_free(struct page *page) |
773 | { | |
3dcc0571 | 774 | __free_reserved_page(page); |
180c06ef | 775 | } |
9d0ad8ca DK |
776 | EXPORT_SYMBOL_GPL(__online_page_free); |
777 | ||
778 | static void generic_online_page(struct page *page) | |
779 | { | |
780 | __online_page_set_limits(page); | |
781 | __online_page_increment_counters(page); | |
782 | __online_page_free(page); | |
783 | } | |
180c06ef | 784 | |
75884fb1 KH |
785 | static int online_pages_range(unsigned long start_pfn, unsigned long nr_pages, |
786 | void *arg) | |
3947be19 DH |
787 | { |
788 | unsigned long i; | |
75884fb1 KH |
789 | unsigned long onlined_pages = *(unsigned long *)arg; |
790 | struct page *page; | |
791 | if (PageReserved(pfn_to_page(start_pfn))) | |
792 | for (i = 0; i < nr_pages; i++) { | |
793 | page = pfn_to_page(start_pfn + i); | |
9d0ad8ca | 794 | (*online_page_callback)(page); |
75884fb1 KH |
795 | onlined_pages++; |
796 | } | |
797 | *(unsigned long *)arg = onlined_pages; | |
798 | return 0; | |
799 | } | |
800 | ||
09285af7 | 801 | #ifdef CONFIG_MOVABLE_NODE |
79a4dcef TC |
802 | /* |
803 | * When CONFIG_MOVABLE_NODE, we permit onlining of a node which doesn't have | |
804 | * normal memory. | |
805 | */ | |
09285af7 LJ |
806 | static bool can_online_high_movable(struct zone *zone) |
807 | { | |
808 | return true; | |
809 | } | |
79a4dcef | 810 | #else /* CONFIG_MOVABLE_NODE */ |
74d42d8f LJ |
811 | /* ensure every online node has NORMAL memory */ |
812 | static bool can_online_high_movable(struct zone *zone) | |
813 | { | |
814 | return node_state(zone_to_nid(zone), N_NORMAL_MEMORY); | |
815 | } | |
79a4dcef | 816 | #endif /* CONFIG_MOVABLE_NODE */ |
74d42d8f | 817 | |
d9713679 LJ |
818 | /* check which state of node_states will be changed when online memory */ |
819 | static void node_states_check_changes_online(unsigned long nr_pages, | |
820 | struct zone *zone, struct memory_notify *arg) | |
821 | { | |
822 | int nid = zone_to_nid(zone); | |
823 | enum zone_type zone_last = ZONE_NORMAL; | |
824 | ||
825 | /* | |
6715ddf9 LJ |
826 | * If we have HIGHMEM or movable node, node_states[N_NORMAL_MEMORY] |
827 | * contains nodes which have zones of 0...ZONE_NORMAL, | |
828 | * set zone_last to ZONE_NORMAL. | |
d9713679 | 829 | * |
6715ddf9 LJ |
830 | * If we don't have HIGHMEM nor movable node, |
831 | * node_states[N_NORMAL_MEMORY] contains nodes which have zones of | |
832 | * 0...ZONE_MOVABLE, set zone_last to ZONE_MOVABLE. | |
d9713679 | 833 | */ |
6715ddf9 | 834 | if (N_MEMORY == N_NORMAL_MEMORY) |
d9713679 LJ |
835 | zone_last = ZONE_MOVABLE; |
836 | ||
837 | /* | |
838 | * if the memory to be online is in a zone of 0...zone_last, and | |
839 | * the zones of 0...zone_last don't have memory before online, we will | |
840 | * need to set the node to node_states[N_NORMAL_MEMORY] after | |
841 | * the memory is online. | |
842 | */ | |
843 | if (zone_idx(zone) <= zone_last && !node_state(nid, N_NORMAL_MEMORY)) | |
844 | arg->status_change_nid_normal = nid; | |
845 | else | |
846 | arg->status_change_nid_normal = -1; | |
847 | ||
6715ddf9 LJ |
848 | #ifdef CONFIG_HIGHMEM |
849 | /* | |
850 | * If we have movable node, node_states[N_HIGH_MEMORY] | |
851 | * contains nodes which have zones of 0...ZONE_HIGHMEM, | |
852 | * set zone_last to ZONE_HIGHMEM. | |
853 | * | |
854 | * If we don't have movable node, node_states[N_NORMAL_MEMORY] | |
855 | * contains nodes which have zones of 0...ZONE_MOVABLE, | |
856 | * set zone_last to ZONE_MOVABLE. | |
857 | */ | |
858 | zone_last = ZONE_HIGHMEM; | |
859 | if (N_MEMORY == N_HIGH_MEMORY) | |
860 | zone_last = ZONE_MOVABLE; | |
861 | ||
862 | if (zone_idx(zone) <= zone_last && !node_state(nid, N_HIGH_MEMORY)) | |
863 | arg->status_change_nid_high = nid; | |
864 | else | |
865 | arg->status_change_nid_high = -1; | |
866 | #else | |
867 | arg->status_change_nid_high = arg->status_change_nid_normal; | |
868 | #endif | |
869 | ||
d9713679 LJ |
870 | /* |
871 | * if the node don't have memory befor online, we will need to | |
6715ddf9 | 872 | * set the node to node_states[N_MEMORY] after the memory |
d9713679 LJ |
873 | * is online. |
874 | */ | |
6715ddf9 | 875 | if (!node_state(nid, N_MEMORY)) |
d9713679 LJ |
876 | arg->status_change_nid = nid; |
877 | else | |
878 | arg->status_change_nid = -1; | |
879 | } | |
880 | ||
881 | static void node_states_set_node(int node, struct memory_notify *arg) | |
882 | { | |
883 | if (arg->status_change_nid_normal >= 0) | |
884 | node_set_state(node, N_NORMAL_MEMORY); | |
885 | ||
6715ddf9 LJ |
886 | if (arg->status_change_nid_high >= 0) |
887 | node_set_state(node, N_HIGH_MEMORY); | |
888 | ||
889 | node_set_state(node, N_MEMORY); | |
d9713679 LJ |
890 | } |
891 | ||
75884fb1 | 892 | |
511c2aba | 893 | int __ref online_pages(unsigned long pfn, unsigned long nr_pages, int online_type) |
75884fb1 | 894 | { |
aa47228a | 895 | unsigned long flags; |
3947be19 DH |
896 | unsigned long onlined_pages = 0; |
897 | struct zone *zone; | |
6811378e | 898 | int need_zonelists_rebuild = 0; |
7b78d335 YG |
899 | int nid; |
900 | int ret; | |
901 | struct memory_notify arg; | |
902 | ||
925268a0 | 903 | lock_memory_hotplug(); |
d9713679 LJ |
904 | /* |
905 | * This doesn't need a lock to do pfn_to_page(). | |
906 | * The section can't be removed here because of the | |
907 | * memory_block->state_mutex. | |
908 | */ | |
909 | zone = page_zone(pfn_to_page(pfn)); | |
910 | ||
74d42d8f LJ |
911 | if ((zone_idx(zone) > ZONE_NORMAL || online_type == ONLINE_MOVABLE) && |
912 | !can_online_high_movable(zone)) { | |
913 | unlock_memory_hotplug(); | |
0a1be150 | 914 | return -EINVAL; |
74d42d8f LJ |
915 | } |
916 | ||
511c2aba LJ |
917 | if (online_type == ONLINE_KERNEL && zone_idx(zone) == ZONE_MOVABLE) { |
918 | if (move_pfn_range_left(zone - 1, zone, pfn, pfn + nr_pages)) { | |
919 | unlock_memory_hotplug(); | |
0a1be150 | 920 | return -EINVAL; |
511c2aba LJ |
921 | } |
922 | } | |
923 | if (online_type == ONLINE_MOVABLE && zone_idx(zone) == ZONE_MOVABLE - 1) { | |
924 | if (move_pfn_range_right(zone, zone + 1, pfn, pfn + nr_pages)) { | |
925 | unlock_memory_hotplug(); | |
0a1be150 | 926 | return -EINVAL; |
511c2aba LJ |
927 | } |
928 | } | |
929 | ||
930 | /* Previous code may changed the zone of the pfn range */ | |
931 | zone = page_zone(pfn_to_page(pfn)); | |
932 | ||
7b78d335 YG |
933 | arg.start_pfn = pfn; |
934 | arg.nr_pages = nr_pages; | |
d9713679 | 935 | node_states_check_changes_online(nr_pages, zone, &arg); |
7b78d335 | 936 | |
9c2606b7 | 937 | nid = pfn_to_nid(pfn); |
3947be19 | 938 | |
7b78d335 YG |
939 | ret = memory_notify(MEM_GOING_ONLINE, &arg); |
940 | ret = notifier_to_errno(ret); | |
941 | if (ret) { | |
942 | memory_notify(MEM_CANCEL_ONLINE, &arg); | |
925268a0 | 943 | unlock_memory_hotplug(); |
7b78d335 YG |
944 | return ret; |
945 | } | |
6811378e YG |
946 | /* |
947 | * If this zone is not populated, then it is not in zonelist. | |
948 | * This means the page allocator ignores this zone. | |
949 | * So, zonelist must be updated after online. | |
950 | */ | |
4eaf3f64 | 951 | mutex_lock(&zonelists_mutex); |
6dcd73d7 | 952 | if (!populated_zone(zone)) { |
6811378e | 953 | need_zonelists_rebuild = 1; |
6dcd73d7 WC |
954 | build_all_zonelists(NULL, zone); |
955 | } | |
6811378e | 956 | |
908eedc6 | 957 | ret = walk_system_ram_range(pfn, nr_pages, &onlined_pages, |
75884fb1 | 958 | online_pages_range); |
fd8a4221 | 959 | if (ret) { |
6dcd73d7 WC |
960 | if (need_zonelists_rebuild) |
961 | zone_pcp_reset(zone); | |
4eaf3f64 | 962 | mutex_unlock(&zonelists_mutex); |
a62e2f4f BH |
963 | printk(KERN_DEBUG "online_pages [mem %#010llx-%#010llx] failed\n", |
964 | (unsigned long long) pfn << PAGE_SHIFT, | |
965 | (((unsigned long long) pfn + nr_pages) | |
966 | << PAGE_SHIFT) - 1); | |
fd8a4221 | 967 | memory_notify(MEM_CANCEL_ONLINE, &arg); |
925268a0 | 968 | unlock_memory_hotplug(); |
fd8a4221 GL |
969 | return ret; |
970 | } | |
971 | ||
3947be19 | 972 | zone->present_pages += onlined_pages; |
aa47228a CS |
973 | |
974 | pgdat_resize_lock(zone->zone_pgdat, &flags); | |
f2937be5 | 975 | zone->zone_pgdat->node_present_pages += onlined_pages; |
aa47228a CS |
976 | pgdat_resize_unlock(zone->zone_pgdat, &flags); |
977 | ||
08dff7b7 | 978 | if (onlined_pages) { |
d9713679 | 979 | node_states_set_node(zone_to_nid(zone), &arg); |
08dff7b7 | 980 | if (need_zonelists_rebuild) |
6dcd73d7 | 981 | build_all_zonelists(NULL, NULL); |
08dff7b7 JL |
982 | else |
983 | zone_pcp_update(zone); | |
984 | } | |
3947be19 | 985 | |
4eaf3f64 | 986 | mutex_unlock(&zonelists_mutex); |
1b79acc9 KM |
987 | |
988 | init_per_zone_wmark_min(); | |
989 | ||
08dff7b7 | 990 | if (onlined_pages) |
7ea1530a | 991 | kswapd_run(zone_to_nid(zone)); |
61b13993 | 992 | |
1f522509 | 993 | vm_total_pages = nr_free_pagecache_pages(); |
2f7f24ec | 994 | |
2d1d43f6 | 995 | writeback_set_ratelimit(); |
7b78d335 YG |
996 | |
997 | if (onlined_pages) | |
998 | memory_notify(MEM_ONLINE, &arg); | |
925268a0 | 999 | unlock_memory_hotplug(); |
7b78d335 | 1000 | |
3947be19 DH |
1001 | return 0; |
1002 | } | |
53947027 | 1003 | #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ |
bc02af93 | 1004 | |
e1319331 HS |
1005 | /* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */ |
1006 | static pg_data_t __ref *hotadd_new_pgdat(int nid, u64 start) | |
9af3c2de YG |
1007 | { |
1008 | struct pglist_data *pgdat; | |
1009 | unsigned long zones_size[MAX_NR_ZONES] = {0}; | |
1010 | unsigned long zholes_size[MAX_NR_ZONES] = {0}; | |
1011 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
1012 | ||
a1e565aa TC |
1013 | pgdat = NODE_DATA(nid); |
1014 | if (!pgdat) { | |
1015 | pgdat = arch_alloc_nodedata(nid); | |
1016 | if (!pgdat) | |
1017 | return NULL; | |
9af3c2de | 1018 | |
a1e565aa TC |
1019 | arch_refresh_nodedata(nid, pgdat); |
1020 | } | |
9af3c2de YG |
1021 | |
1022 | /* we can use NODE_DATA(nid) from here */ | |
1023 | ||
1024 | /* init node's zones as empty zones, we don't have any present pages.*/ | |
9109fb7b | 1025 | free_area_init_node(nid, zones_size, start_pfn, zholes_size); |
9af3c2de | 1026 | |
959ecc48 KH |
1027 | /* |
1028 | * The node we allocated has no zone fallback lists. For avoiding | |
1029 | * to access not-initialized zonelist, build here. | |
1030 | */ | |
f957db4f | 1031 | mutex_lock(&zonelists_mutex); |
9adb62a5 | 1032 | build_all_zonelists(pgdat, NULL); |
f957db4f | 1033 | mutex_unlock(&zonelists_mutex); |
959ecc48 | 1034 | |
9af3c2de YG |
1035 | return pgdat; |
1036 | } | |
1037 | ||
1038 | static void rollback_node_hotadd(int nid, pg_data_t *pgdat) | |
1039 | { | |
1040 | arch_refresh_nodedata(nid, NULL); | |
1041 | arch_free_nodedata(pgdat); | |
1042 | return; | |
1043 | } | |
1044 | ||
0a547039 | 1045 | |
01b0f197 TK |
1046 | /** |
1047 | * try_online_node - online a node if offlined | |
1048 | * | |
cf23422b | 1049 | * called by cpu_up() to online a node without onlined memory. |
1050 | */ | |
01b0f197 | 1051 | int try_online_node(int nid) |
cf23422b | 1052 | { |
1053 | pg_data_t *pgdat; | |
1054 | int ret; | |
1055 | ||
01b0f197 TK |
1056 | if (node_online(nid)) |
1057 | return 0; | |
1058 | ||
20d6c96b | 1059 | lock_memory_hotplug(); |
cf23422b | 1060 | pgdat = hotadd_new_pgdat(nid, 0); |
7553e8f2 | 1061 | if (!pgdat) { |
01b0f197 | 1062 | pr_err("Cannot online node %d due to NULL pgdat\n", nid); |
cf23422b | 1063 | ret = -ENOMEM; |
1064 | goto out; | |
1065 | } | |
1066 | node_set_online(nid); | |
1067 | ret = register_one_node(nid); | |
1068 | BUG_ON(ret); | |
1069 | ||
01b0f197 TK |
1070 | if (pgdat->node_zonelists->_zonerefs->zone == NULL) { |
1071 | mutex_lock(&zonelists_mutex); | |
1072 | build_all_zonelists(NULL, NULL); | |
1073 | mutex_unlock(&zonelists_mutex); | |
1074 | } | |
1075 | ||
cf23422b | 1076 | out: |
20d6c96b | 1077 | unlock_memory_hotplug(); |
cf23422b | 1078 | return ret; |
1079 | } | |
1080 | ||
27356f54 TK |
1081 | static int check_hotplug_memory_range(u64 start, u64 size) |
1082 | { | |
1083 | u64 start_pfn = start >> PAGE_SHIFT; | |
1084 | u64 nr_pages = size >> PAGE_SHIFT; | |
1085 | ||
1086 | /* Memory range must be aligned with section */ | |
1087 | if ((start_pfn & ~PAGE_SECTION_MASK) || | |
1088 | (nr_pages % PAGES_PER_SECTION) || (!nr_pages)) { | |
1089 | pr_err("Section-unaligned hotplug range: start 0x%llx, size 0x%llx\n", | |
1090 | (unsigned long long)start, | |
1091 | (unsigned long long)size); | |
1092 | return -EINVAL; | |
1093 | } | |
1094 | ||
1095 | return 0; | |
1096 | } | |
1097 | ||
31168481 AV |
1098 | /* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */ |
1099 | int __ref add_memory(int nid, u64 start, u64 size) | |
bc02af93 | 1100 | { |
9af3c2de | 1101 | pg_data_t *pgdat = NULL; |
a1e565aa TC |
1102 | bool new_pgdat; |
1103 | bool new_node; | |
ebd15302 | 1104 | struct resource *res; |
bc02af93 YG |
1105 | int ret; |
1106 | ||
27356f54 TK |
1107 | ret = check_hotplug_memory_range(start, size); |
1108 | if (ret) | |
1109 | return ret; | |
1110 | ||
20d6c96b | 1111 | lock_memory_hotplug(); |
6ad696d2 | 1112 | |
ebd15302 | 1113 | res = register_memory_resource(start, size); |
6ad696d2 | 1114 | ret = -EEXIST; |
ebd15302 | 1115 | if (!res) |
6ad696d2 | 1116 | goto out; |
ebd15302 | 1117 | |
a1e565aa TC |
1118 | { /* Stupid hack to suppress address-never-null warning */ |
1119 | void *p = NODE_DATA(nid); | |
1120 | new_pgdat = !p; | |
1121 | } | |
1122 | new_node = !node_online(nid); | |
1123 | if (new_node) { | |
9af3c2de | 1124 | pgdat = hotadd_new_pgdat(nid, start); |
6ad696d2 | 1125 | ret = -ENOMEM; |
9af3c2de | 1126 | if (!pgdat) |
41b9e2d7 | 1127 | goto error; |
9af3c2de YG |
1128 | } |
1129 | ||
bc02af93 YG |
1130 | /* call arch's memory hotadd */ |
1131 | ret = arch_add_memory(nid, start, size); | |
1132 | ||
9af3c2de YG |
1133 | if (ret < 0) |
1134 | goto error; | |
1135 | ||
0fc44159 | 1136 | /* we online node here. we can't roll back from here. */ |
9af3c2de YG |
1137 | node_set_online(nid); |
1138 | ||
a1e565aa | 1139 | if (new_node) { |
0fc44159 YG |
1140 | ret = register_one_node(nid); |
1141 | /* | |
1142 | * If sysfs file of new node can't create, cpu on the node | |
1143 | * can't be hot-added. There is no rollback way now. | |
1144 | * So, check by BUG_ON() to catch it reluctantly.. | |
1145 | */ | |
1146 | BUG_ON(ret); | |
1147 | } | |
1148 | ||
d96ae530 | 1149 | /* create new memmap entry */ |
1150 | firmware_map_add_hotplug(start, start + size, "System RAM"); | |
1151 | ||
6ad696d2 AK |
1152 | goto out; |
1153 | ||
9af3c2de YG |
1154 | error: |
1155 | /* rollback pgdat allocation and others */ | |
1156 | if (new_pgdat) | |
1157 | rollback_node_hotadd(nid, pgdat); | |
a864b9d0 | 1158 | release_memory_resource(res); |
9af3c2de | 1159 | |
6ad696d2 | 1160 | out: |
20d6c96b | 1161 | unlock_memory_hotplug(); |
bc02af93 YG |
1162 | return ret; |
1163 | } | |
1164 | EXPORT_SYMBOL_GPL(add_memory); | |
0c0e6195 KH |
1165 | |
1166 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
5c755e9f BP |
1167 | /* |
1168 | * A free page on the buddy free lists (not the per-cpu lists) has PageBuddy | |
1169 | * set and the size of the free page is given by page_order(). Using this, | |
1170 | * the function determines if the pageblock contains only free pages. | |
1171 | * Due to buddy contraints, a free page at least the size of a pageblock will | |
1172 | * be located at the start of the pageblock | |
1173 | */ | |
1174 | static inline int pageblock_free(struct page *page) | |
1175 | { | |
1176 | return PageBuddy(page) && page_order(page) >= pageblock_order; | |
1177 | } | |
1178 | ||
1179 | /* Return the start of the next active pageblock after a given page */ | |
1180 | static struct page *next_active_pageblock(struct page *page) | |
1181 | { | |
5c755e9f BP |
1182 | /* Ensure the starting page is pageblock-aligned */ |
1183 | BUG_ON(page_to_pfn(page) & (pageblock_nr_pages - 1)); | |
1184 | ||
5c755e9f | 1185 | /* If the entire pageblock is free, move to the end of free page */ |
0dcc48c1 KH |
1186 | if (pageblock_free(page)) { |
1187 | int order; | |
1188 | /* be careful. we don't have locks, page_order can be changed.*/ | |
1189 | order = page_order(page); | |
1190 | if ((order < MAX_ORDER) && (order >= pageblock_order)) | |
1191 | return page + (1 << order); | |
1192 | } | |
5c755e9f | 1193 | |
0dcc48c1 | 1194 | return page + pageblock_nr_pages; |
5c755e9f BP |
1195 | } |
1196 | ||
1197 | /* Checks if this range of memory is likely to be hot-removable. */ | |
1198 | int is_mem_section_removable(unsigned long start_pfn, unsigned long nr_pages) | |
1199 | { | |
5c755e9f BP |
1200 | struct page *page = pfn_to_page(start_pfn); |
1201 | struct page *end_page = page + nr_pages; | |
1202 | ||
1203 | /* Check the starting page of each pageblock within the range */ | |
1204 | for (; page < end_page; page = next_active_pageblock(page)) { | |
49ac8255 | 1205 | if (!is_pageblock_removable_nolock(page)) |
5c755e9f | 1206 | return 0; |
49ac8255 | 1207 | cond_resched(); |
5c755e9f BP |
1208 | } |
1209 | ||
1210 | /* All pageblocks in the memory block are likely to be hot-removable */ | |
1211 | return 1; | |
1212 | } | |
1213 | ||
0c0e6195 KH |
1214 | /* |
1215 | * Confirm all pages in a range [start, end) is belongs to the same zone. | |
1216 | */ | |
1217 | static int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn) | |
1218 | { | |
1219 | unsigned long pfn; | |
1220 | struct zone *zone = NULL; | |
1221 | struct page *page; | |
1222 | int i; | |
1223 | for (pfn = start_pfn; | |
1224 | pfn < end_pfn; | |
1225 | pfn += MAX_ORDER_NR_PAGES) { | |
1226 | i = 0; | |
1227 | /* This is just a CONFIG_HOLES_IN_ZONE check.*/ | |
1228 | while ((i < MAX_ORDER_NR_PAGES) && !pfn_valid_within(pfn + i)) | |
1229 | i++; | |
1230 | if (i == MAX_ORDER_NR_PAGES) | |
1231 | continue; | |
1232 | page = pfn_to_page(pfn + i); | |
1233 | if (zone && page_zone(page) != zone) | |
1234 | return 0; | |
1235 | zone = page_zone(page); | |
1236 | } | |
1237 | return 1; | |
1238 | } | |
1239 | ||
1240 | /* | |
c8721bbb NH |
1241 | * Scan pfn range [start,end) to find movable/migratable pages (LRU pages |
1242 | * and hugepages). We scan pfn because it's much easier than scanning over | |
1243 | * linked list. This function returns the pfn of the first found movable | |
1244 | * page if it's found, otherwise 0. | |
0c0e6195 | 1245 | */ |
c8721bbb | 1246 | static unsigned long scan_movable_pages(unsigned long start, unsigned long end) |
0c0e6195 KH |
1247 | { |
1248 | unsigned long pfn; | |
1249 | struct page *page; | |
1250 | for (pfn = start; pfn < end; pfn++) { | |
1251 | if (pfn_valid(pfn)) { | |
1252 | page = pfn_to_page(pfn); | |
1253 | if (PageLRU(page)) | |
1254 | return pfn; | |
c8721bbb NH |
1255 | if (PageHuge(page)) { |
1256 | if (is_hugepage_active(page)) | |
1257 | return pfn; | |
1258 | else | |
1259 | pfn = round_up(pfn + 1, | |
1260 | 1 << compound_order(page)) - 1; | |
1261 | } | |
0c0e6195 KH |
1262 | } |
1263 | } | |
1264 | return 0; | |
1265 | } | |
1266 | ||
0c0e6195 KH |
1267 | #define NR_OFFLINE_AT_ONCE_PAGES (256) |
1268 | static int | |
1269 | do_migrate_range(unsigned long start_pfn, unsigned long end_pfn) | |
1270 | { | |
1271 | unsigned long pfn; | |
1272 | struct page *page; | |
1273 | int move_pages = NR_OFFLINE_AT_ONCE_PAGES; | |
1274 | int not_managed = 0; | |
1275 | int ret = 0; | |
1276 | LIST_HEAD(source); | |
1277 | ||
1278 | for (pfn = start_pfn; pfn < end_pfn && move_pages > 0; pfn++) { | |
1279 | if (!pfn_valid(pfn)) | |
1280 | continue; | |
1281 | page = pfn_to_page(pfn); | |
c8721bbb NH |
1282 | |
1283 | if (PageHuge(page)) { | |
1284 | struct page *head = compound_head(page); | |
1285 | pfn = page_to_pfn(head) + (1<<compound_order(head)) - 1; | |
1286 | if (compound_order(head) > PFN_SECTION_SHIFT) { | |
1287 | ret = -EBUSY; | |
1288 | break; | |
1289 | } | |
1290 | if (isolate_huge_page(page, &source)) | |
1291 | move_pages -= 1 << compound_order(head); | |
1292 | continue; | |
1293 | } | |
1294 | ||
700c2a46 | 1295 | if (!get_page_unless_zero(page)) |
0c0e6195 KH |
1296 | continue; |
1297 | /* | |
1298 | * We can skip free pages. And we can only deal with pages on | |
1299 | * LRU. | |
1300 | */ | |
62695a84 | 1301 | ret = isolate_lru_page(page); |
0c0e6195 | 1302 | if (!ret) { /* Success */ |
700c2a46 | 1303 | put_page(page); |
62695a84 | 1304 | list_add_tail(&page->lru, &source); |
0c0e6195 | 1305 | move_pages--; |
6d9c285a KM |
1306 | inc_zone_page_state(page, NR_ISOLATED_ANON + |
1307 | page_is_file_cache(page)); | |
1308 | ||
0c0e6195 | 1309 | } else { |
0c0e6195 | 1310 | #ifdef CONFIG_DEBUG_VM |
718a3821 WF |
1311 | printk(KERN_ALERT "removing pfn %lx from LRU failed\n", |
1312 | pfn); | |
1313 | dump_page(page); | |
0c0e6195 | 1314 | #endif |
700c2a46 | 1315 | put_page(page); |
25985edc | 1316 | /* Because we don't have big zone->lock. we should |
809c4449 BL |
1317 | check this again here. */ |
1318 | if (page_count(page)) { | |
1319 | not_managed++; | |
f3ab2636 | 1320 | ret = -EBUSY; |
809c4449 BL |
1321 | break; |
1322 | } | |
0c0e6195 KH |
1323 | } |
1324 | } | |
f3ab2636 BL |
1325 | if (!list_empty(&source)) { |
1326 | if (not_managed) { | |
c8721bbb | 1327 | putback_movable_pages(&source); |
f3ab2636 BL |
1328 | goto out; |
1329 | } | |
74c08f98 MK |
1330 | |
1331 | /* | |
1332 | * alloc_migrate_target should be improooooved!! | |
1333 | * migrate_pages returns # of failed pages. | |
1334 | */ | |
1335 | ret = migrate_pages(&source, alloc_migrate_target, 0, | |
9c620e2b | 1336 | MIGRATE_SYNC, MR_MEMORY_HOTPLUG); |
f3ab2636 | 1337 | if (ret) |
c8721bbb | 1338 | putback_movable_pages(&source); |
0c0e6195 | 1339 | } |
0c0e6195 KH |
1340 | out: |
1341 | return ret; | |
1342 | } | |
1343 | ||
1344 | /* | |
1345 | * remove from free_area[] and mark all as Reserved. | |
1346 | */ | |
1347 | static int | |
1348 | offline_isolated_pages_cb(unsigned long start, unsigned long nr_pages, | |
1349 | void *data) | |
1350 | { | |
1351 | __offline_isolated_pages(start, start + nr_pages); | |
1352 | return 0; | |
1353 | } | |
1354 | ||
1355 | static void | |
1356 | offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn) | |
1357 | { | |
908eedc6 | 1358 | walk_system_ram_range(start_pfn, end_pfn - start_pfn, NULL, |
0c0e6195 KH |
1359 | offline_isolated_pages_cb); |
1360 | } | |
1361 | ||
1362 | /* | |
1363 | * Check all pages in range, recoreded as memory resource, are isolated. | |
1364 | */ | |
1365 | static int | |
1366 | check_pages_isolated_cb(unsigned long start_pfn, unsigned long nr_pages, | |
1367 | void *data) | |
1368 | { | |
1369 | int ret; | |
1370 | long offlined = *(long *)data; | |
b023f468 | 1371 | ret = test_pages_isolated(start_pfn, start_pfn + nr_pages, true); |
0c0e6195 KH |
1372 | offlined = nr_pages; |
1373 | if (!ret) | |
1374 | *(long *)data += offlined; | |
1375 | return ret; | |
1376 | } | |
1377 | ||
1378 | static long | |
1379 | check_pages_isolated(unsigned long start_pfn, unsigned long end_pfn) | |
1380 | { | |
1381 | long offlined = 0; | |
1382 | int ret; | |
1383 | ||
908eedc6 | 1384 | ret = walk_system_ram_range(start_pfn, end_pfn - start_pfn, &offlined, |
0c0e6195 KH |
1385 | check_pages_isolated_cb); |
1386 | if (ret < 0) | |
1387 | offlined = (long)ret; | |
1388 | return offlined; | |
1389 | } | |
1390 | ||
09285af7 | 1391 | #ifdef CONFIG_MOVABLE_NODE |
79a4dcef TC |
1392 | /* |
1393 | * When CONFIG_MOVABLE_NODE, we permit offlining of a node which doesn't have | |
1394 | * normal memory. | |
1395 | */ | |
09285af7 LJ |
1396 | static bool can_offline_normal(struct zone *zone, unsigned long nr_pages) |
1397 | { | |
1398 | return true; | |
1399 | } | |
79a4dcef | 1400 | #else /* CONFIG_MOVABLE_NODE */ |
74d42d8f LJ |
1401 | /* ensure the node has NORMAL memory if it is still online */ |
1402 | static bool can_offline_normal(struct zone *zone, unsigned long nr_pages) | |
1403 | { | |
1404 | struct pglist_data *pgdat = zone->zone_pgdat; | |
1405 | unsigned long present_pages = 0; | |
1406 | enum zone_type zt; | |
1407 | ||
1408 | for (zt = 0; zt <= ZONE_NORMAL; zt++) | |
1409 | present_pages += pgdat->node_zones[zt].present_pages; | |
1410 | ||
1411 | if (present_pages > nr_pages) | |
1412 | return true; | |
1413 | ||
1414 | present_pages = 0; | |
1415 | for (; zt <= ZONE_MOVABLE; zt++) | |
1416 | present_pages += pgdat->node_zones[zt].present_pages; | |
1417 | ||
1418 | /* | |
1419 | * we can't offline the last normal memory until all | |
1420 | * higher memory is offlined. | |
1421 | */ | |
1422 | return present_pages == 0; | |
1423 | } | |
79a4dcef | 1424 | #endif /* CONFIG_MOVABLE_NODE */ |
74d42d8f | 1425 | |
c5320926 TC |
1426 | static int __init cmdline_parse_movable_node(char *p) |
1427 | { | |
1428 | #ifdef CONFIG_MOVABLE_NODE | |
1429 | /* | |
1430 | * Memory used by the kernel cannot be hot-removed because Linux | |
1431 | * cannot migrate the kernel pages. When memory hotplug is | |
1432 | * enabled, we should prevent memblock from allocating memory | |
1433 | * for the kernel. | |
1434 | * | |
1435 | * ACPI SRAT records all hotpluggable memory ranges. But before | |
1436 | * SRAT is parsed, we don't know about it. | |
1437 | * | |
1438 | * The kernel image is loaded into memory at very early time. We | |
1439 | * cannot prevent this anyway. So on NUMA system, we set any | |
1440 | * node the kernel resides in as un-hotpluggable. | |
1441 | * | |
1442 | * Since on modern servers, one node could have double-digit | |
1443 | * gigabytes memory, we can assume the memory around the kernel | |
1444 | * image is also un-hotpluggable. So before SRAT is parsed, just | |
1445 | * allocate memory near the kernel image to try the best to keep | |
1446 | * the kernel away from hotpluggable memory. | |
1447 | */ | |
1448 | memblock_set_bottom_up(true); | |
1449 | #else | |
1450 | pr_warn("movable_node option not supported\n"); | |
1451 | #endif | |
1452 | return 0; | |
1453 | } | |
1454 | early_param("movable_node", cmdline_parse_movable_node); | |
1455 | ||
d9713679 LJ |
1456 | /* check which state of node_states will be changed when offline memory */ |
1457 | static void node_states_check_changes_offline(unsigned long nr_pages, | |
1458 | struct zone *zone, struct memory_notify *arg) | |
1459 | { | |
1460 | struct pglist_data *pgdat = zone->zone_pgdat; | |
1461 | unsigned long present_pages = 0; | |
1462 | enum zone_type zt, zone_last = ZONE_NORMAL; | |
1463 | ||
1464 | /* | |
6715ddf9 LJ |
1465 | * If we have HIGHMEM or movable node, node_states[N_NORMAL_MEMORY] |
1466 | * contains nodes which have zones of 0...ZONE_NORMAL, | |
1467 | * set zone_last to ZONE_NORMAL. | |
d9713679 | 1468 | * |
6715ddf9 LJ |
1469 | * If we don't have HIGHMEM nor movable node, |
1470 | * node_states[N_NORMAL_MEMORY] contains nodes which have zones of | |
1471 | * 0...ZONE_MOVABLE, set zone_last to ZONE_MOVABLE. | |
d9713679 | 1472 | */ |
6715ddf9 | 1473 | if (N_MEMORY == N_NORMAL_MEMORY) |
d9713679 LJ |
1474 | zone_last = ZONE_MOVABLE; |
1475 | ||
1476 | /* | |
1477 | * check whether node_states[N_NORMAL_MEMORY] will be changed. | |
1478 | * If the memory to be offline is in a zone of 0...zone_last, | |
1479 | * and it is the last present memory, 0...zone_last will | |
1480 | * become empty after offline , thus we can determind we will | |
1481 | * need to clear the node from node_states[N_NORMAL_MEMORY]. | |
1482 | */ | |
1483 | for (zt = 0; zt <= zone_last; zt++) | |
1484 | present_pages += pgdat->node_zones[zt].present_pages; | |
1485 | if (zone_idx(zone) <= zone_last && nr_pages >= present_pages) | |
1486 | arg->status_change_nid_normal = zone_to_nid(zone); | |
1487 | else | |
1488 | arg->status_change_nid_normal = -1; | |
1489 | ||
6715ddf9 LJ |
1490 | #ifdef CONFIG_HIGHMEM |
1491 | /* | |
1492 | * If we have movable node, node_states[N_HIGH_MEMORY] | |
1493 | * contains nodes which have zones of 0...ZONE_HIGHMEM, | |
1494 | * set zone_last to ZONE_HIGHMEM. | |
1495 | * | |
1496 | * If we don't have movable node, node_states[N_NORMAL_MEMORY] | |
1497 | * contains nodes which have zones of 0...ZONE_MOVABLE, | |
1498 | * set zone_last to ZONE_MOVABLE. | |
1499 | */ | |
1500 | zone_last = ZONE_HIGHMEM; | |
1501 | if (N_MEMORY == N_HIGH_MEMORY) | |
1502 | zone_last = ZONE_MOVABLE; | |
1503 | ||
1504 | for (; zt <= zone_last; zt++) | |
1505 | present_pages += pgdat->node_zones[zt].present_pages; | |
1506 | if (zone_idx(zone) <= zone_last && nr_pages >= present_pages) | |
1507 | arg->status_change_nid_high = zone_to_nid(zone); | |
1508 | else | |
1509 | arg->status_change_nid_high = -1; | |
1510 | #else | |
1511 | arg->status_change_nid_high = arg->status_change_nid_normal; | |
1512 | #endif | |
1513 | ||
d9713679 LJ |
1514 | /* |
1515 | * node_states[N_HIGH_MEMORY] contains nodes which have 0...ZONE_MOVABLE | |
1516 | */ | |
1517 | zone_last = ZONE_MOVABLE; | |
1518 | ||
1519 | /* | |
1520 | * check whether node_states[N_HIGH_MEMORY] will be changed | |
1521 | * If we try to offline the last present @nr_pages from the node, | |
1522 | * we can determind we will need to clear the node from | |
1523 | * node_states[N_HIGH_MEMORY]. | |
1524 | */ | |
1525 | for (; zt <= zone_last; zt++) | |
1526 | present_pages += pgdat->node_zones[zt].present_pages; | |
1527 | if (nr_pages >= present_pages) | |
1528 | arg->status_change_nid = zone_to_nid(zone); | |
1529 | else | |
1530 | arg->status_change_nid = -1; | |
1531 | } | |
1532 | ||
1533 | static void node_states_clear_node(int node, struct memory_notify *arg) | |
1534 | { | |
1535 | if (arg->status_change_nid_normal >= 0) | |
1536 | node_clear_state(node, N_NORMAL_MEMORY); | |
1537 | ||
6715ddf9 LJ |
1538 | if ((N_MEMORY != N_NORMAL_MEMORY) && |
1539 | (arg->status_change_nid_high >= 0)) | |
d9713679 | 1540 | node_clear_state(node, N_HIGH_MEMORY); |
6715ddf9 LJ |
1541 | |
1542 | if ((N_MEMORY != N_HIGH_MEMORY) && | |
1543 | (arg->status_change_nid >= 0)) | |
1544 | node_clear_state(node, N_MEMORY); | |
d9713679 LJ |
1545 | } |
1546 | ||
a16cee10 | 1547 | static int __ref __offline_pages(unsigned long start_pfn, |
0c0e6195 KH |
1548 | unsigned long end_pfn, unsigned long timeout) |
1549 | { | |
1550 | unsigned long pfn, nr_pages, expire; | |
1551 | long offlined_pages; | |
7b78d335 | 1552 | int ret, drain, retry_max, node; |
d702909f | 1553 | unsigned long flags; |
0c0e6195 | 1554 | struct zone *zone; |
7b78d335 | 1555 | struct memory_notify arg; |
0c0e6195 | 1556 | |
0c0e6195 KH |
1557 | /* at least, alignment against pageblock is necessary */ |
1558 | if (!IS_ALIGNED(start_pfn, pageblock_nr_pages)) | |
1559 | return -EINVAL; | |
1560 | if (!IS_ALIGNED(end_pfn, pageblock_nr_pages)) | |
1561 | return -EINVAL; | |
1562 | /* This makes hotplug much easier...and readable. | |
1563 | we assume this for now. .*/ | |
1564 | if (!test_pages_in_a_zone(start_pfn, end_pfn)) | |
1565 | return -EINVAL; | |
7b78d335 | 1566 | |
20d6c96b | 1567 | lock_memory_hotplug(); |
6ad696d2 | 1568 | |
7b78d335 YG |
1569 | zone = page_zone(pfn_to_page(start_pfn)); |
1570 | node = zone_to_nid(zone); | |
1571 | nr_pages = end_pfn - start_pfn; | |
1572 | ||
74d42d8f LJ |
1573 | ret = -EINVAL; |
1574 | if (zone_idx(zone) <= ZONE_NORMAL && !can_offline_normal(zone, nr_pages)) | |
1575 | goto out; | |
1576 | ||
0c0e6195 | 1577 | /* set above range as isolated */ |
b023f468 WC |
1578 | ret = start_isolate_page_range(start_pfn, end_pfn, |
1579 | MIGRATE_MOVABLE, true); | |
0c0e6195 | 1580 | if (ret) |
6ad696d2 | 1581 | goto out; |
7b78d335 YG |
1582 | |
1583 | arg.start_pfn = start_pfn; | |
1584 | arg.nr_pages = nr_pages; | |
d9713679 | 1585 | node_states_check_changes_offline(nr_pages, zone, &arg); |
7b78d335 YG |
1586 | |
1587 | ret = memory_notify(MEM_GOING_OFFLINE, &arg); | |
1588 | ret = notifier_to_errno(ret); | |
1589 | if (ret) | |
1590 | goto failed_removal; | |
1591 | ||
0c0e6195 KH |
1592 | pfn = start_pfn; |
1593 | expire = jiffies + timeout; | |
1594 | drain = 0; | |
1595 | retry_max = 5; | |
1596 | repeat: | |
1597 | /* start memory hot removal */ | |
1598 | ret = -EAGAIN; | |
1599 | if (time_after(jiffies, expire)) | |
1600 | goto failed_removal; | |
1601 | ret = -EINTR; | |
1602 | if (signal_pending(current)) | |
1603 | goto failed_removal; | |
1604 | ret = 0; | |
1605 | if (drain) { | |
1606 | lru_add_drain_all(); | |
0c0e6195 | 1607 | cond_resched(); |
9f8f2172 | 1608 | drain_all_pages(); |
0c0e6195 KH |
1609 | } |
1610 | ||
c8721bbb NH |
1611 | pfn = scan_movable_pages(start_pfn, end_pfn); |
1612 | if (pfn) { /* We have movable pages */ | |
0c0e6195 KH |
1613 | ret = do_migrate_range(pfn, end_pfn); |
1614 | if (!ret) { | |
1615 | drain = 1; | |
1616 | goto repeat; | |
1617 | } else { | |
1618 | if (ret < 0) | |
1619 | if (--retry_max == 0) | |
1620 | goto failed_removal; | |
1621 | yield(); | |
1622 | drain = 1; | |
1623 | goto repeat; | |
1624 | } | |
1625 | } | |
b3834be5 | 1626 | /* drain all zone's lru pagevec, this is asynchronous... */ |
0c0e6195 | 1627 | lru_add_drain_all(); |
0c0e6195 | 1628 | yield(); |
b3834be5 | 1629 | /* drain pcp pages, this is synchronous. */ |
9f8f2172 | 1630 | drain_all_pages(); |
c8721bbb NH |
1631 | /* |
1632 | * dissolve free hugepages in the memory block before doing offlining | |
1633 | * actually in order to make hugetlbfs's object counting consistent. | |
1634 | */ | |
1635 | dissolve_free_huge_pages(start_pfn, end_pfn); | |
0c0e6195 KH |
1636 | /* check again */ |
1637 | offlined_pages = check_pages_isolated(start_pfn, end_pfn); | |
1638 | if (offlined_pages < 0) { | |
1639 | ret = -EBUSY; | |
1640 | goto failed_removal; | |
1641 | } | |
1642 | printk(KERN_INFO "Offlined Pages %ld\n", offlined_pages); | |
b3834be5 | 1643 | /* Ok, all of our target is isolated. |
0c0e6195 KH |
1644 | We cannot do rollback at this point. */ |
1645 | offline_isolated_pages(start_pfn, end_pfn); | |
dbc0e4ce | 1646 | /* reset pagetype flags and makes migrate type to be MOVABLE */ |
0815f3d8 | 1647 | undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE); |
0c0e6195 | 1648 | /* removal success */ |
3dcc0571 | 1649 | adjust_managed_page_count(pfn_to_page(start_pfn), -offlined_pages); |
0c0e6195 | 1650 | zone->present_pages -= offlined_pages; |
d702909f CS |
1651 | |
1652 | pgdat_resize_lock(zone->zone_pgdat, &flags); | |
0c0e6195 | 1653 | zone->zone_pgdat->node_present_pages -= offlined_pages; |
d702909f | 1654 | pgdat_resize_unlock(zone->zone_pgdat, &flags); |
7b78d335 | 1655 | |
1b79acc9 KM |
1656 | init_per_zone_wmark_min(); |
1657 | ||
1e8537ba | 1658 | if (!populated_zone(zone)) { |
340175b7 | 1659 | zone_pcp_reset(zone); |
1e8537ba XQ |
1660 | mutex_lock(&zonelists_mutex); |
1661 | build_all_zonelists(NULL, NULL); | |
1662 | mutex_unlock(&zonelists_mutex); | |
1663 | } else | |
1664 | zone_pcp_update(zone); | |
340175b7 | 1665 | |
d9713679 LJ |
1666 | node_states_clear_node(node, &arg); |
1667 | if (arg.status_change_nid >= 0) | |
8fe23e05 | 1668 | kswapd_stop(node); |
bce7394a | 1669 | |
0c0e6195 KH |
1670 | vm_total_pages = nr_free_pagecache_pages(); |
1671 | writeback_set_ratelimit(); | |
7b78d335 YG |
1672 | |
1673 | memory_notify(MEM_OFFLINE, &arg); | |
20d6c96b | 1674 | unlock_memory_hotplug(); |
0c0e6195 KH |
1675 | return 0; |
1676 | ||
1677 | failed_removal: | |
a62e2f4f BH |
1678 | printk(KERN_INFO "memory offlining [mem %#010llx-%#010llx] failed\n", |
1679 | (unsigned long long) start_pfn << PAGE_SHIFT, | |
1680 | ((unsigned long long) end_pfn << PAGE_SHIFT) - 1); | |
7b78d335 | 1681 | memory_notify(MEM_CANCEL_OFFLINE, &arg); |
0c0e6195 | 1682 | /* pushback to free area */ |
0815f3d8 | 1683 | undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE); |
7b78d335 | 1684 | |
6ad696d2 | 1685 | out: |
20d6c96b | 1686 | unlock_memory_hotplug(); |
0c0e6195 KH |
1687 | return ret; |
1688 | } | |
71088785 | 1689 | |
a16cee10 WC |
1690 | int offline_pages(unsigned long start_pfn, unsigned long nr_pages) |
1691 | { | |
1692 | return __offline_pages(start_pfn, start_pfn + nr_pages, 120 * HZ); | |
1693 | } | |
e2ff3940 | 1694 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
a16cee10 | 1695 | |
bbc76be6 WC |
1696 | /** |
1697 | * walk_memory_range - walks through all mem sections in [start_pfn, end_pfn) | |
1698 | * @start_pfn: start pfn of the memory range | |
e05c4bbf | 1699 | * @end_pfn: end pfn of the memory range |
bbc76be6 WC |
1700 | * @arg: argument passed to func |
1701 | * @func: callback for each memory section walked | |
1702 | * | |
1703 | * This function walks through all present mem sections in range | |
1704 | * [start_pfn, end_pfn) and call func on each mem section. | |
1705 | * | |
1706 | * Returns the return value of func. | |
1707 | */ | |
e2ff3940 | 1708 | int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn, |
bbc76be6 | 1709 | void *arg, int (*func)(struct memory_block *, void *)) |
71088785 | 1710 | { |
e90bdb7f WC |
1711 | struct memory_block *mem = NULL; |
1712 | struct mem_section *section; | |
e90bdb7f WC |
1713 | unsigned long pfn, section_nr; |
1714 | int ret; | |
e90bdb7f WC |
1715 | |
1716 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { | |
1717 | section_nr = pfn_to_section_nr(pfn); | |
1718 | if (!present_section_nr(section_nr)) | |
1719 | continue; | |
1720 | ||
1721 | section = __nr_to_section(section_nr); | |
1722 | /* same memblock? */ | |
1723 | if (mem) | |
1724 | if ((section_nr >= mem->start_section_nr) && | |
1725 | (section_nr <= mem->end_section_nr)) | |
1726 | continue; | |
1727 | ||
1728 | mem = find_memory_block_hinted(section, mem); | |
1729 | if (!mem) | |
1730 | continue; | |
1731 | ||
bbc76be6 | 1732 | ret = func(mem, arg); |
e90bdb7f | 1733 | if (ret) { |
bbc76be6 WC |
1734 | kobject_put(&mem->dev.kobj); |
1735 | return ret; | |
e90bdb7f WC |
1736 | } |
1737 | } | |
1738 | ||
1739 | if (mem) | |
1740 | kobject_put(&mem->dev.kobj); | |
1741 | ||
bbc76be6 WC |
1742 | return 0; |
1743 | } | |
1744 | ||
e2ff3940 | 1745 | #ifdef CONFIG_MEMORY_HOTREMOVE |
d6de9d53 | 1746 | static int check_memblock_offlined_cb(struct memory_block *mem, void *arg) |
bbc76be6 WC |
1747 | { |
1748 | int ret = !is_memblock_offlined(mem); | |
1749 | ||
349daa0f RD |
1750 | if (unlikely(ret)) { |
1751 | phys_addr_t beginpa, endpa; | |
1752 | ||
1753 | beginpa = PFN_PHYS(section_nr_to_pfn(mem->start_section_nr)); | |
1754 | endpa = PFN_PHYS(section_nr_to_pfn(mem->end_section_nr + 1))-1; | |
bbc76be6 | 1755 | pr_warn("removing memory fails, because memory " |
349daa0f RD |
1756 | "[%pa-%pa] is onlined\n", |
1757 | &beginpa, &endpa); | |
1758 | } | |
bbc76be6 WC |
1759 | |
1760 | return ret; | |
1761 | } | |
1762 | ||
0f1cfe9d | 1763 | static int check_cpu_on_node(pg_data_t *pgdat) |
60a5a19e | 1764 | { |
60a5a19e TC |
1765 | int cpu; |
1766 | ||
1767 | for_each_present_cpu(cpu) { | |
1768 | if (cpu_to_node(cpu) == pgdat->node_id) | |
1769 | /* | |
1770 | * the cpu on this node isn't removed, and we can't | |
1771 | * offline this node. | |
1772 | */ | |
1773 | return -EBUSY; | |
1774 | } | |
1775 | ||
1776 | return 0; | |
1777 | } | |
1778 | ||
0f1cfe9d | 1779 | static void unmap_cpu_on_node(pg_data_t *pgdat) |
e13fe869 WC |
1780 | { |
1781 | #ifdef CONFIG_ACPI_NUMA | |
e13fe869 WC |
1782 | int cpu; |
1783 | ||
1784 | for_each_possible_cpu(cpu) | |
1785 | if (cpu_to_node(cpu) == pgdat->node_id) | |
1786 | numa_clear_node(cpu); | |
1787 | #endif | |
1788 | } | |
1789 | ||
0f1cfe9d | 1790 | static int check_and_unmap_cpu_on_node(pg_data_t *pgdat) |
e13fe869 | 1791 | { |
0f1cfe9d | 1792 | int ret; |
e13fe869 | 1793 | |
0f1cfe9d | 1794 | ret = check_cpu_on_node(pgdat); |
e13fe869 WC |
1795 | if (ret) |
1796 | return ret; | |
1797 | ||
1798 | /* | |
1799 | * the node will be offlined when we come here, so we can clear | |
1800 | * the cpu_to_node() now. | |
1801 | */ | |
1802 | ||
0f1cfe9d | 1803 | unmap_cpu_on_node(pgdat); |
e13fe869 WC |
1804 | return 0; |
1805 | } | |
1806 | ||
0f1cfe9d TK |
1807 | /** |
1808 | * try_offline_node | |
1809 | * | |
1810 | * Offline a node if all memory sections and cpus of the node are removed. | |
1811 | * | |
1812 | * NOTE: The caller must call lock_device_hotplug() to serialize hotplug | |
1813 | * and online/offline operations before this call. | |
1814 | */ | |
90b30cdc | 1815 | void try_offline_node(int nid) |
60a5a19e | 1816 | { |
d822b86a WC |
1817 | pg_data_t *pgdat = NODE_DATA(nid); |
1818 | unsigned long start_pfn = pgdat->node_start_pfn; | |
1819 | unsigned long end_pfn = start_pfn + pgdat->node_spanned_pages; | |
60a5a19e | 1820 | unsigned long pfn; |
d822b86a WC |
1821 | struct page *pgdat_page = virt_to_page(pgdat); |
1822 | int i; | |
60a5a19e TC |
1823 | |
1824 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { | |
1825 | unsigned long section_nr = pfn_to_section_nr(pfn); | |
1826 | ||
1827 | if (!present_section_nr(section_nr)) | |
1828 | continue; | |
1829 | ||
1830 | if (pfn_to_nid(pfn) != nid) | |
1831 | continue; | |
1832 | ||
1833 | /* | |
1834 | * some memory sections of this node are not removed, and we | |
1835 | * can't offline node now. | |
1836 | */ | |
1837 | return; | |
1838 | } | |
1839 | ||
0f1cfe9d | 1840 | if (check_and_unmap_cpu_on_node(pgdat)) |
60a5a19e TC |
1841 | return; |
1842 | ||
1843 | /* | |
1844 | * all memory/cpu of this node are removed, we can offline this | |
1845 | * node now. | |
1846 | */ | |
1847 | node_set_offline(nid); | |
1848 | unregister_one_node(nid); | |
d822b86a WC |
1849 | |
1850 | if (!PageSlab(pgdat_page) && !PageCompound(pgdat_page)) | |
1851 | /* node data is allocated from boot memory */ | |
1852 | return; | |
1853 | ||
1854 | /* free waittable in each zone */ | |
1855 | for (i = 0; i < MAX_NR_ZONES; i++) { | |
1856 | struct zone *zone = pgdat->node_zones + i; | |
1857 | ||
ca4b3f30 JW |
1858 | /* |
1859 | * wait_table may be allocated from boot memory, | |
1860 | * here only free if it's allocated by vmalloc. | |
1861 | */ | |
1862 | if (is_vmalloc_addr(zone->wait_table)) | |
d822b86a WC |
1863 | vfree(zone->wait_table); |
1864 | } | |
1865 | ||
1866 | /* | |
1867 | * Since there is no way to guarentee the address of pgdat/zone is not | |
1868 | * on stack of any kernel threads or used by other kernel objects | |
1869 | * without reference counting or other symchronizing method, do not | |
1870 | * reset node_data and free pgdat here. Just reset it to 0 and reuse | |
1871 | * the memory when the node is online again. | |
1872 | */ | |
1873 | memset(pgdat, 0, sizeof(*pgdat)); | |
60a5a19e | 1874 | } |
90b30cdc | 1875 | EXPORT_SYMBOL(try_offline_node); |
60a5a19e | 1876 | |
0f1cfe9d TK |
1877 | /** |
1878 | * remove_memory | |
1879 | * | |
1880 | * NOTE: The caller must call lock_device_hotplug() to serialize hotplug | |
1881 | * and online/offline operations before this call, as required by | |
1882 | * try_offline_node(). | |
1883 | */ | |
242831eb | 1884 | void __ref remove_memory(int nid, u64 start, u64 size) |
bbc76be6 | 1885 | { |
242831eb | 1886 | int ret; |
993c1aad | 1887 | |
27356f54 TK |
1888 | BUG_ON(check_hotplug_memory_range(start, size)); |
1889 | ||
6677e3ea YI |
1890 | lock_memory_hotplug(); |
1891 | ||
1892 | /* | |
242831eb RW |
1893 | * All memory blocks must be offlined before removing memory. Check |
1894 | * whether all memory blocks in question are offline and trigger a BUG() | |
1895 | * if this is not the case. | |
6677e3ea | 1896 | */ |
242831eb | 1897 | ret = walk_memory_range(PFN_DOWN(start), PFN_UP(start + size - 1), NULL, |
d6de9d53 | 1898 | check_memblock_offlined_cb); |
bbc76be6 WC |
1899 | if (ret) { |
1900 | unlock_memory_hotplug(); | |
242831eb | 1901 | BUG(); |
6677e3ea YI |
1902 | } |
1903 | ||
46c66c4b YI |
1904 | /* remove memmap entry */ |
1905 | firmware_map_remove(start, start + size, "System RAM"); | |
1906 | ||
24d335ca WC |
1907 | arch_remove_memory(start, size); |
1908 | ||
60a5a19e TC |
1909 | try_offline_node(nid); |
1910 | ||
6677e3ea | 1911 | unlock_memory_hotplug(); |
71088785 | 1912 | } |
71088785 | 1913 | EXPORT_SYMBOL_GPL(remove_memory); |
aba6efc4 | 1914 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |