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> |
3947be19 DH |
34 | |
35 | #include <asm/tlbflush.h> | |
36 | ||
1e5ad9a3 AB |
37 | #include "internal.h" |
38 | ||
9d0ad8ca DK |
39 | /* |
40 | * online_page_callback contains pointer to current page onlining function. | |
41 | * Initially it is generic_online_page(). If it is required it could be | |
42 | * changed by calling set_online_page_callback() for callback registration | |
43 | * and restore_online_page_callback() for generic callback restore. | |
44 | */ | |
45 | ||
46 | static void generic_online_page(struct page *page); | |
47 | ||
48 | static online_page_callback_t online_page_callback = generic_online_page; | |
49 | ||
20d6c96b KM |
50 | DEFINE_MUTEX(mem_hotplug_mutex); |
51 | ||
52 | void lock_memory_hotplug(void) | |
53 | { | |
54 | mutex_lock(&mem_hotplug_mutex); | |
20d6c96b KM |
55 | } |
56 | ||
57 | void unlock_memory_hotplug(void) | |
58 | { | |
20d6c96b KM |
59 | mutex_unlock(&mem_hotplug_mutex); |
60 | } | |
61 | ||
62 | ||
45e0b78b KM |
63 | /* add this memory to iomem resource */ |
64 | static struct resource *register_memory_resource(u64 start, u64 size) | |
65 | { | |
66 | struct resource *res; | |
67 | res = kzalloc(sizeof(struct resource), GFP_KERNEL); | |
68 | BUG_ON(!res); | |
69 | ||
70 | res->name = "System RAM"; | |
71 | res->start = start; | |
72 | res->end = start + size - 1; | |
887c3cb1 | 73 | res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; |
45e0b78b | 74 | if (request_resource(&iomem_resource, res) < 0) { |
4996eed8 | 75 | pr_debug("System RAM resource %pR cannot be added\n", res); |
45e0b78b KM |
76 | kfree(res); |
77 | res = NULL; | |
78 | } | |
79 | return res; | |
80 | } | |
81 | ||
82 | static void release_memory_resource(struct resource *res) | |
83 | { | |
84 | if (!res) | |
85 | return; | |
86 | release_resource(res); | |
87 | kfree(res); | |
88 | return; | |
89 | } | |
90 | ||
53947027 | 91 | #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE |
46723bfa YI |
92 | void get_page_bootmem(unsigned long info, struct page *page, |
93 | unsigned long type) | |
04753278 | 94 | { |
5f24ce5f | 95 | page->lru.next = (struct list_head *) type; |
04753278 YG |
96 | SetPagePrivate(page); |
97 | set_page_private(page, info); | |
98 | atomic_inc(&page->_count); | |
99 | } | |
100 | ||
170a5a7e | 101 | void put_page_bootmem(struct page *page) |
04753278 | 102 | { |
5f24ce5f | 103 | unsigned long type; |
04753278 | 104 | |
5f24ce5f AA |
105 | type = (unsigned long) page->lru.next; |
106 | BUG_ON(type < MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE || | |
107 | type > MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE); | |
04753278 YG |
108 | |
109 | if (atomic_dec_return(&page->_count) == 1) { | |
110 | ClearPagePrivate(page); | |
111 | set_page_private(page, 0); | |
5f24ce5f | 112 | INIT_LIST_HEAD(&page->lru); |
170a5a7e | 113 | free_reserved_page(page); |
04753278 | 114 | } |
04753278 YG |
115 | } |
116 | ||
46723bfa YI |
117 | #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE |
118 | #ifndef CONFIG_SPARSEMEM_VMEMMAP | |
d92bc318 | 119 | static void register_page_bootmem_info_section(unsigned long start_pfn) |
04753278 YG |
120 | { |
121 | unsigned long *usemap, mapsize, section_nr, i; | |
122 | struct mem_section *ms; | |
123 | struct page *page, *memmap; | |
124 | ||
04753278 YG |
125 | section_nr = pfn_to_section_nr(start_pfn); |
126 | ms = __nr_to_section(section_nr); | |
127 | ||
128 | /* Get section's memmap address */ | |
129 | memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); | |
130 | ||
131 | /* | |
132 | * Get page for the memmap's phys address | |
133 | * XXX: need more consideration for sparse_vmemmap... | |
134 | */ | |
135 | page = virt_to_page(memmap); | |
136 | mapsize = sizeof(struct page) * PAGES_PER_SECTION; | |
137 | mapsize = PAGE_ALIGN(mapsize) >> PAGE_SHIFT; | |
138 | ||
139 | /* remember memmap's page */ | |
140 | for (i = 0; i < mapsize; i++, page++) | |
141 | get_page_bootmem(section_nr, page, SECTION_INFO); | |
142 | ||
143 | usemap = __nr_to_section(section_nr)->pageblock_flags; | |
144 | page = virt_to_page(usemap); | |
145 | ||
146 | mapsize = PAGE_ALIGN(usemap_size()) >> PAGE_SHIFT; | |
147 | ||
148 | for (i = 0; i < mapsize; i++, page++) | |
af370fb8 | 149 | get_page_bootmem(section_nr, page, MIX_SECTION_INFO); |
04753278 YG |
150 | |
151 | } | |
46723bfa YI |
152 | #else /* CONFIG_SPARSEMEM_VMEMMAP */ |
153 | static void register_page_bootmem_info_section(unsigned long start_pfn) | |
154 | { | |
155 | unsigned long *usemap, mapsize, section_nr, i; | |
156 | struct mem_section *ms; | |
157 | struct page *page, *memmap; | |
158 | ||
159 | if (!pfn_valid(start_pfn)) | |
160 | return; | |
161 | ||
162 | section_nr = pfn_to_section_nr(start_pfn); | |
163 | ms = __nr_to_section(section_nr); | |
164 | ||
165 | memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); | |
166 | ||
167 | register_page_bootmem_memmap(section_nr, memmap, PAGES_PER_SECTION); | |
168 | ||
169 | usemap = __nr_to_section(section_nr)->pageblock_flags; | |
170 | page = virt_to_page(usemap); | |
171 | ||
172 | mapsize = PAGE_ALIGN(usemap_size()) >> PAGE_SHIFT; | |
173 | ||
174 | for (i = 0; i < mapsize; i++, page++) | |
175 | get_page_bootmem(section_nr, page, MIX_SECTION_INFO); | |
176 | } | |
177 | #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ | |
04753278 YG |
178 | |
179 | void register_page_bootmem_info_node(struct pglist_data *pgdat) | |
180 | { | |
181 | unsigned long i, pfn, end_pfn, nr_pages; | |
182 | int node = pgdat->node_id; | |
183 | struct page *page; | |
184 | struct zone *zone; | |
185 | ||
186 | nr_pages = PAGE_ALIGN(sizeof(struct pglist_data)) >> PAGE_SHIFT; | |
187 | page = virt_to_page(pgdat); | |
188 | ||
189 | for (i = 0; i < nr_pages; i++, page++) | |
190 | get_page_bootmem(node, page, NODE_INFO); | |
191 | ||
192 | zone = &pgdat->node_zones[0]; | |
193 | for (; zone < pgdat->node_zones + MAX_NR_ZONES - 1; zone++) { | |
139c2d75 | 194 | if (zone_is_initialized(zone)) { |
04753278 YG |
195 | nr_pages = zone->wait_table_hash_nr_entries |
196 | * sizeof(wait_queue_head_t); | |
197 | nr_pages = PAGE_ALIGN(nr_pages) >> PAGE_SHIFT; | |
198 | page = virt_to_page(zone->wait_table); | |
199 | ||
200 | for (i = 0; i < nr_pages; i++, page++) | |
201 | get_page_bootmem(node, page, NODE_INFO); | |
202 | } | |
203 | } | |
204 | ||
205 | pfn = pgdat->node_start_pfn; | |
c1f19495 | 206 | end_pfn = pgdat_end_pfn(pgdat); |
04753278 | 207 | |
7e9f5eb0 | 208 | /* register section info */ |
f14851af | 209 | for (; pfn < end_pfn; pfn += PAGES_PER_SECTION) { |
210 | /* | |
211 | * Some platforms can assign the same pfn to multiple nodes - on | |
212 | * node0 as well as nodeN. To avoid registering a pfn against | |
213 | * multiple nodes we check that this pfn does not already | |
7e9f5eb0 | 214 | * reside in some other nodes. |
f14851af | 215 | */ |
216 | if (pfn_valid(pfn) && (pfn_to_nid(pfn) == node)) | |
217 | register_page_bootmem_info_section(pfn); | |
218 | } | |
04753278 | 219 | } |
46723bfa | 220 | #endif /* CONFIG_HAVE_BOOTMEM_INFO_NODE */ |
04753278 | 221 | |
76cdd58e HC |
222 | static void grow_zone_span(struct zone *zone, unsigned long start_pfn, |
223 | unsigned long end_pfn) | |
224 | { | |
225 | unsigned long old_zone_end_pfn; | |
226 | ||
227 | zone_span_writelock(zone); | |
228 | ||
c33bc315 | 229 | old_zone_end_pfn = zone_end_pfn(zone); |
8080fc03 | 230 | if (zone_is_empty(zone) || start_pfn < zone->zone_start_pfn) |
76cdd58e HC |
231 | zone->zone_start_pfn = start_pfn; |
232 | ||
233 | zone->spanned_pages = max(old_zone_end_pfn, end_pfn) - | |
234 | zone->zone_start_pfn; | |
235 | ||
236 | zone_span_writeunlock(zone); | |
237 | } | |
238 | ||
511c2aba LJ |
239 | static void resize_zone(struct zone *zone, unsigned long start_pfn, |
240 | unsigned long end_pfn) | |
241 | { | |
242 | zone_span_writelock(zone); | |
243 | ||
e455a9b9 LJ |
244 | if (end_pfn - start_pfn) { |
245 | zone->zone_start_pfn = start_pfn; | |
246 | zone->spanned_pages = end_pfn - start_pfn; | |
247 | } else { | |
248 | /* | |
249 | * make it consist as free_area_init_core(), | |
250 | * if spanned_pages = 0, then keep start_pfn = 0 | |
251 | */ | |
252 | zone->zone_start_pfn = 0; | |
253 | zone->spanned_pages = 0; | |
254 | } | |
511c2aba LJ |
255 | |
256 | zone_span_writeunlock(zone); | |
257 | } | |
258 | ||
259 | static void fix_zone_id(struct zone *zone, unsigned long start_pfn, | |
260 | unsigned long end_pfn) | |
261 | { | |
262 | enum zone_type zid = zone_idx(zone); | |
263 | int nid = zone->zone_pgdat->node_id; | |
264 | unsigned long pfn; | |
265 | ||
266 | for (pfn = start_pfn; pfn < end_pfn; pfn++) | |
267 | set_page_links(pfn_to_page(pfn), zid, nid, pfn); | |
268 | } | |
269 | ||
f6bbb78e CS |
270 | /* Can fail with -ENOMEM from allocating a wait table with vmalloc() or |
271 | * alloc_bootmem_node_nopanic() */ | |
272 | static int __ref ensure_zone_is_initialized(struct zone *zone, | |
273 | unsigned long start_pfn, unsigned long num_pages) | |
274 | { | |
275 | if (!zone_is_initialized(zone)) | |
276 | return init_currently_empty_zone(zone, start_pfn, num_pages, | |
277 | MEMMAP_HOTPLUG); | |
278 | return 0; | |
279 | } | |
280 | ||
e455a9b9 | 281 | static int __meminit move_pfn_range_left(struct zone *z1, struct zone *z2, |
511c2aba LJ |
282 | unsigned long start_pfn, unsigned long end_pfn) |
283 | { | |
e455a9b9 | 284 | int ret; |
511c2aba | 285 | unsigned long flags; |
e455a9b9 LJ |
286 | unsigned long z1_start_pfn; |
287 | ||
64dd1b29 CS |
288 | ret = ensure_zone_is_initialized(z1, start_pfn, end_pfn - start_pfn); |
289 | if (ret) | |
290 | return ret; | |
511c2aba LJ |
291 | |
292 | pgdat_resize_lock(z1->zone_pgdat, &flags); | |
293 | ||
294 | /* can't move pfns which are higher than @z2 */ | |
108bcc96 | 295 | if (end_pfn > zone_end_pfn(z2)) |
511c2aba | 296 | goto out_fail; |
834405c3 | 297 | /* the move out part must be at the left most of @z2 */ |
511c2aba LJ |
298 | if (start_pfn > z2->zone_start_pfn) |
299 | goto out_fail; | |
300 | /* must included/overlap */ | |
301 | if (end_pfn <= z2->zone_start_pfn) | |
302 | goto out_fail; | |
303 | ||
e455a9b9 | 304 | /* use start_pfn for z1's start_pfn if z1 is empty */ |
8080fc03 | 305 | if (!zone_is_empty(z1)) |
e455a9b9 LJ |
306 | z1_start_pfn = z1->zone_start_pfn; |
307 | else | |
308 | z1_start_pfn = start_pfn; | |
309 | ||
310 | resize_zone(z1, z1_start_pfn, end_pfn); | |
108bcc96 | 311 | resize_zone(z2, end_pfn, zone_end_pfn(z2)); |
511c2aba LJ |
312 | |
313 | pgdat_resize_unlock(z1->zone_pgdat, &flags); | |
314 | ||
315 | fix_zone_id(z1, start_pfn, end_pfn); | |
316 | ||
317 | return 0; | |
318 | out_fail: | |
319 | pgdat_resize_unlock(z1->zone_pgdat, &flags); | |
320 | return -1; | |
321 | } | |
322 | ||
e455a9b9 | 323 | static int __meminit move_pfn_range_right(struct zone *z1, struct zone *z2, |
511c2aba LJ |
324 | unsigned long start_pfn, unsigned long end_pfn) |
325 | { | |
e455a9b9 | 326 | int ret; |
511c2aba | 327 | unsigned long flags; |
e455a9b9 LJ |
328 | unsigned long z2_end_pfn; |
329 | ||
64dd1b29 CS |
330 | ret = ensure_zone_is_initialized(z2, start_pfn, end_pfn - start_pfn); |
331 | if (ret) | |
332 | return ret; | |
511c2aba LJ |
333 | |
334 | pgdat_resize_lock(z1->zone_pgdat, &flags); | |
335 | ||
336 | /* can't move pfns which are lower than @z1 */ | |
337 | if (z1->zone_start_pfn > start_pfn) | |
338 | goto out_fail; | |
339 | /* the move out part mast at the right most of @z1 */ | |
108bcc96 | 340 | if (zone_end_pfn(z1) > end_pfn) |
511c2aba LJ |
341 | goto out_fail; |
342 | /* must included/overlap */ | |
108bcc96 | 343 | if (start_pfn >= zone_end_pfn(z1)) |
511c2aba LJ |
344 | goto out_fail; |
345 | ||
e455a9b9 | 346 | /* use end_pfn for z2's end_pfn if z2 is empty */ |
8080fc03 | 347 | if (!zone_is_empty(z2)) |
108bcc96 | 348 | z2_end_pfn = zone_end_pfn(z2); |
e455a9b9 LJ |
349 | else |
350 | z2_end_pfn = end_pfn; | |
351 | ||
511c2aba | 352 | resize_zone(z1, z1->zone_start_pfn, start_pfn); |
e455a9b9 | 353 | resize_zone(z2, start_pfn, z2_end_pfn); |
511c2aba LJ |
354 | |
355 | pgdat_resize_unlock(z1->zone_pgdat, &flags); | |
356 | ||
357 | fix_zone_id(z2, start_pfn, end_pfn); | |
358 | ||
359 | return 0; | |
360 | out_fail: | |
361 | pgdat_resize_unlock(z1->zone_pgdat, &flags); | |
362 | return -1; | |
363 | } | |
364 | ||
76cdd58e HC |
365 | static void grow_pgdat_span(struct pglist_data *pgdat, unsigned long start_pfn, |
366 | unsigned long end_pfn) | |
367 | { | |
368 | unsigned long old_pgdat_end_pfn = | |
369 | pgdat->node_start_pfn + pgdat->node_spanned_pages; | |
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 | 405 | int nr_pages = PAGES_PER_SECTION; |
3947be19 DH |
406 | int ret; |
407 | ||
ebd15302 KH |
408 | if (pfn_valid(phys_start_pfn)) |
409 | return -EEXIST; | |
410 | ||
0b0acbec | 411 | ret = sparse_add_one_section(zone, phys_start_pfn, nr_pages); |
3947be19 DH |
412 | |
413 | if (ret < 0) | |
414 | return ret; | |
415 | ||
718127cc YG |
416 | ret = __add_zone(zone, phys_start_pfn); |
417 | ||
418 | if (ret < 0) | |
419 | return ret; | |
420 | ||
c04fc586 | 421 | return register_new_memory(nid, __pfn_to_section(phys_start_pfn)); |
3947be19 DH |
422 | } |
423 | ||
4edd7cef DR |
424 | /* |
425 | * Reasonably generic function for adding memory. It is | |
426 | * expected that archs that support memory hotplug will | |
427 | * call this function after deciding the zone to which to | |
428 | * add the new pages. | |
429 | */ | |
430 | int __ref __add_pages(int nid, struct zone *zone, unsigned long phys_start_pfn, | |
431 | unsigned long nr_pages) | |
432 | { | |
433 | unsigned long i; | |
434 | int err = 0; | |
435 | int start_sec, end_sec; | |
436 | /* during initialize mem_map, align hot-added range to section */ | |
437 | start_sec = pfn_to_section_nr(phys_start_pfn); | |
438 | end_sec = pfn_to_section_nr(phys_start_pfn + nr_pages - 1); | |
439 | ||
440 | for (i = start_sec; i <= end_sec; i++) { | |
441 | err = __add_section(nid, zone, i << PFN_SECTION_SHIFT); | |
442 | ||
443 | /* | |
444 | * EEXIST is finally dealt with by ioresource collision | |
445 | * check. see add_memory() => register_memory_resource() | |
446 | * Warning will be printed if there is collision. | |
447 | */ | |
448 | if (err && (err != -EEXIST)) | |
449 | break; | |
450 | err = 0; | |
451 | } | |
452 | ||
453 | return err; | |
454 | } | |
455 | EXPORT_SYMBOL_GPL(__add_pages); | |
456 | ||
457 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
815121d2 YI |
458 | /* find the smallest valid pfn in the range [start_pfn, end_pfn) */ |
459 | static int find_smallest_section_pfn(int nid, struct zone *zone, | |
460 | unsigned long start_pfn, | |
461 | unsigned long end_pfn) | |
462 | { | |
463 | struct mem_section *ms; | |
464 | ||
465 | for (; start_pfn < end_pfn; start_pfn += PAGES_PER_SECTION) { | |
466 | ms = __pfn_to_section(start_pfn); | |
467 | ||
468 | if (unlikely(!valid_section(ms))) | |
469 | continue; | |
470 | ||
471 | if (unlikely(pfn_to_nid(start_pfn) != nid)) | |
472 | continue; | |
473 | ||
474 | if (zone && zone != page_zone(pfn_to_page(start_pfn))) | |
475 | continue; | |
476 | ||
477 | return start_pfn; | |
478 | } | |
479 | ||
480 | return 0; | |
481 | } | |
482 | ||
483 | /* find the biggest valid pfn in the range [start_pfn, end_pfn). */ | |
484 | static int find_biggest_section_pfn(int nid, struct zone *zone, | |
485 | unsigned long start_pfn, | |
486 | unsigned long end_pfn) | |
487 | { | |
488 | struct mem_section *ms; | |
489 | unsigned long pfn; | |
490 | ||
491 | /* pfn is the end pfn of a memory section. */ | |
492 | pfn = end_pfn - 1; | |
493 | for (; pfn >= start_pfn; pfn -= PAGES_PER_SECTION) { | |
494 | ms = __pfn_to_section(pfn); | |
495 | ||
496 | if (unlikely(!valid_section(ms))) | |
497 | continue; | |
498 | ||
499 | if (unlikely(pfn_to_nid(pfn) != nid)) | |
500 | continue; | |
501 | ||
502 | if (zone && zone != page_zone(pfn_to_page(pfn))) | |
503 | continue; | |
504 | ||
505 | return pfn; | |
506 | } | |
507 | ||
508 | return 0; | |
509 | } | |
510 | ||
511 | static void shrink_zone_span(struct zone *zone, unsigned long start_pfn, | |
512 | unsigned long end_pfn) | |
513 | { | |
c33bc315 XQ |
514 | unsigned long zone_start_pfn = zone->zone_start_pfn; |
515 | unsigned long z = zone_end_pfn(zone); /* zone_end_pfn namespace clash */ | |
516 | unsigned long zone_end_pfn = z; | |
815121d2 YI |
517 | unsigned long pfn; |
518 | struct mem_section *ms; | |
519 | int nid = zone_to_nid(zone); | |
520 | ||
521 | zone_span_writelock(zone); | |
522 | if (zone_start_pfn == start_pfn) { | |
523 | /* | |
524 | * If the section is smallest section in the zone, it need | |
525 | * shrink zone->zone_start_pfn and zone->zone_spanned_pages. | |
526 | * In this case, we find second smallest valid mem_section | |
527 | * for shrinking zone. | |
528 | */ | |
529 | pfn = find_smallest_section_pfn(nid, zone, end_pfn, | |
530 | zone_end_pfn); | |
531 | if (pfn) { | |
532 | zone->zone_start_pfn = pfn; | |
533 | zone->spanned_pages = zone_end_pfn - pfn; | |
534 | } | |
535 | } else if (zone_end_pfn == end_pfn) { | |
536 | /* | |
537 | * If the section is biggest section in the zone, it need | |
538 | * shrink zone->spanned_pages. | |
539 | * In this case, we find second biggest valid mem_section for | |
540 | * shrinking zone. | |
541 | */ | |
542 | pfn = find_biggest_section_pfn(nid, zone, zone_start_pfn, | |
543 | start_pfn); | |
544 | if (pfn) | |
545 | zone->spanned_pages = pfn - zone_start_pfn + 1; | |
546 | } | |
547 | ||
548 | /* | |
549 | * The section is not biggest or smallest mem_section in the zone, it | |
550 | * only creates a hole in the zone. So in this case, we need not | |
551 | * change the zone. But perhaps, the zone has only hole data. Thus | |
552 | * it check the zone has only hole or not. | |
553 | */ | |
554 | pfn = zone_start_pfn; | |
555 | for (; pfn < zone_end_pfn; pfn += PAGES_PER_SECTION) { | |
556 | ms = __pfn_to_section(pfn); | |
557 | ||
558 | if (unlikely(!valid_section(ms))) | |
559 | continue; | |
560 | ||
561 | if (page_zone(pfn_to_page(pfn)) != zone) | |
562 | continue; | |
563 | ||
564 | /* If the section is current section, it continues the loop */ | |
565 | if (start_pfn == pfn) | |
566 | continue; | |
567 | ||
568 | /* If we find valid section, we have nothing to do */ | |
569 | zone_span_writeunlock(zone); | |
570 | return; | |
571 | } | |
572 | ||
573 | /* The zone has no valid section */ | |
574 | zone->zone_start_pfn = 0; | |
575 | zone->spanned_pages = 0; | |
576 | zone_span_writeunlock(zone); | |
577 | } | |
578 | ||
579 | static void shrink_pgdat_span(struct pglist_data *pgdat, | |
580 | unsigned long start_pfn, unsigned long end_pfn) | |
581 | { | |
582 | unsigned long pgdat_start_pfn = pgdat->node_start_pfn; | |
583 | unsigned long pgdat_end_pfn = | |
584 | pgdat->node_start_pfn + pgdat->node_spanned_pages; | |
585 | unsigned long pfn; | |
586 | struct mem_section *ms; | |
587 | int nid = pgdat->node_id; | |
588 | ||
589 | if (pgdat_start_pfn == start_pfn) { | |
590 | /* | |
591 | * If the section is smallest section in the pgdat, it need | |
592 | * shrink pgdat->node_start_pfn and pgdat->node_spanned_pages. | |
593 | * In this case, we find second smallest valid mem_section | |
594 | * for shrinking zone. | |
595 | */ | |
596 | pfn = find_smallest_section_pfn(nid, NULL, end_pfn, | |
597 | pgdat_end_pfn); | |
598 | if (pfn) { | |
599 | pgdat->node_start_pfn = pfn; | |
600 | pgdat->node_spanned_pages = pgdat_end_pfn - pfn; | |
601 | } | |
602 | } else if (pgdat_end_pfn == end_pfn) { | |
603 | /* | |
604 | * If the section is biggest section in the pgdat, it need | |
605 | * shrink pgdat->node_spanned_pages. | |
606 | * In this case, we find second biggest valid mem_section for | |
607 | * shrinking zone. | |
608 | */ | |
609 | pfn = find_biggest_section_pfn(nid, NULL, pgdat_start_pfn, | |
610 | start_pfn); | |
611 | if (pfn) | |
612 | pgdat->node_spanned_pages = pfn - pgdat_start_pfn + 1; | |
613 | } | |
614 | ||
615 | /* | |
616 | * If the section is not biggest or smallest mem_section in the pgdat, | |
617 | * it only creates a hole in the pgdat. So in this case, we need not | |
618 | * change the pgdat. | |
619 | * But perhaps, the pgdat has only hole data. Thus it check the pgdat | |
620 | * has only hole or not. | |
621 | */ | |
622 | pfn = pgdat_start_pfn; | |
623 | for (; pfn < pgdat_end_pfn; pfn += PAGES_PER_SECTION) { | |
624 | ms = __pfn_to_section(pfn); | |
625 | ||
626 | if (unlikely(!valid_section(ms))) | |
627 | continue; | |
628 | ||
629 | if (pfn_to_nid(pfn) != nid) | |
630 | continue; | |
631 | ||
632 | /* If the section is current section, it continues the loop */ | |
633 | if (start_pfn == pfn) | |
634 | continue; | |
635 | ||
636 | /* If we find valid section, we have nothing to do */ | |
637 | return; | |
638 | } | |
639 | ||
640 | /* The pgdat has no valid section */ | |
641 | pgdat->node_start_pfn = 0; | |
642 | pgdat->node_spanned_pages = 0; | |
643 | } | |
644 | ||
645 | static void __remove_zone(struct zone *zone, unsigned long start_pfn) | |
646 | { | |
647 | struct pglist_data *pgdat = zone->zone_pgdat; | |
648 | int nr_pages = PAGES_PER_SECTION; | |
649 | int zone_type; | |
650 | unsigned long flags; | |
651 | ||
652 | zone_type = zone - pgdat->node_zones; | |
653 | ||
654 | pgdat_resize_lock(zone->zone_pgdat, &flags); | |
655 | shrink_zone_span(zone, start_pfn, start_pfn + nr_pages); | |
656 | shrink_pgdat_span(pgdat, start_pfn, start_pfn + nr_pages); | |
657 | pgdat_resize_unlock(zone->zone_pgdat, &flags); | |
658 | } | |
659 | ||
ea01ea93 BP |
660 | static int __remove_section(struct zone *zone, struct mem_section *ms) |
661 | { | |
815121d2 YI |
662 | unsigned long start_pfn; |
663 | int scn_nr; | |
ea01ea93 BP |
664 | int ret = -EINVAL; |
665 | ||
666 | if (!valid_section(ms)) | |
667 | return ret; | |
668 | ||
669 | ret = unregister_memory_section(ms); | |
670 | if (ret) | |
671 | return ret; | |
672 | ||
815121d2 YI |
673 | scn_nr = __section_nr(ms); |
674 | start_pfn = section_nr_to_pfn(scn_nr); | |
675 | __remove_zone(zone, start_pfn); | |
676 | ||
ea01ea93 | 677 | sparse_remove_one_section(zone, ms); |
ea01ea93 BP |
678 | return 0; |
679 | } | |
680 | ||
ea01ea93 BP |
681 | /** |
682 | * __remove_pages() - remove sections of pages from a zone | |
683 | * @zone: zone from which pages need to be removed | |
684 | * @phys_start_pfn: starting pageframe (must be aligned to start of a section) | |
685 | * @nr_pages: number of pages to remove (must be multiple of section size) | |
686 | * | |
687 | * Generic helper function to remove section mappings and sysfs entries | |
688 | * for the section of the memory we are removing. Caller needs to make | |
689 | * sure that pages are marked reserved and zones are adjust properly by | |
690 | * calling offline_pages(). | |
691 | */ | |
692 | int __remove_pages(struct zone *zone, unsigned long phys_start_pfn, | |
693 | unsigned long nr_pages) | |
694 | { | |
fe74ebb1 | 695 | unsigned long i; |
ea01ea93 | 696 | int sections_to_remove; |
fe74ebb1 TK |
697 | resource_size_t start, size; |
698 | int ret = 0; | |
ea01ea93 BP |
699 | |
700 | /* | |
701 | * We can only remove entire sections | |
702 | */ | |
703 | BUG_ON(phys_start_pfn & ~PAGE_SECTION_MASK); | |
704 | BUG_ON(nr_pages % PAGES_PER_SECTION); | |
705 | ||
fe74ebb1 TK |
706 | start = phys_start_pfn << PAGE_SHIFT; |
707 | size = nr_pages * PAGE_SIZE; | |
708 | ret = release_mem_region_adjustable(&iomem_resource, start, size); | |
348f9f05 RD |
709 | if (ret) { |
710 | resource_size_t endres = start + size - 1; | |
711 | ||
712 | pr_warn("Unable to release resource <%pa-%pa> (%d)\n", | |
713 | &start, &endres, ret); | |
714 | } | |
d760afd4 | 715 | |
ea01ea93 BP |
716 | sections_to_remove = nr_pages / PAGES_PER_SECTION; |
717 | for (i = 0; i < sections_to_remove; i++) { | |
718 | unsigned long pfn = phys_start_pfn + i*PAGES_PER_SECTION; | |
719 | ret = __remove_section(zone, __pfn_to_section(pfn)); | |
720 | if (ret) | |
721 | break; | |
722 | } | |
723 | return ret; | |
724 | } | |
725 | EXPORT_SYMBOL_GPL(__remove_pages); | |
4edd7cef | 726 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
ea01ea93 | 727 | |
9d0ad8ca DK |
728 | int set_online_page_callback(online_page_callback_t callback) |
729 | { | |
730 | int rc = -EINVAL; | |
731 | ||
732 | lock_memory_hotplug(); | |
733 | ||
734 | if (online_page_callback == generic_online_page) { | |
735 | online_page_callback = callback; | |
736 | rc = 0; | |
737 | } | |
738 | ||
739 | unlock_memory_hotplug(); | |
740 | ||
741 | return rc; | |
742 | } | |
743 | EXPORT_SYMBOL_GPL(set_online_page_callback); | |
744 | ||
745 | int restore_online_page_callback(online_page_callback_t callback) | |
746 | { | |
747 | int rc = -EINVAL; | |
748 | ||
749 | lock_memory_hotplug(); | |
750 | ||
751 | if (online_page_callback == callback) { | |
752 | online_page_callback = generic_online_page; | |
753 | rc = 0; | |
754 | } | |
755 | ||
756 | unlock_memory_hotplug(); | |
757 | ||
758 | return rc; | |
759 | } | |
760 | EXPORT_SYMBOL_GPL(restore_online_page_callback); | |
761 | ||
762 | void __online_page_set_limits(struct page *page) | |
180c06ef | 763 | { |
9d0ad8ca DK |
764 | } |
765 | EXPORT_SYMBOL_GPL(__online_page_set_limits); | |
766 | ||
767 | void __online_page_increment_counters(struct page *page) | |
768 | { | |
3dcc0571 | 769 | adjust_managed_page_count(page, 1); |
9d0ad8ca DK |
770 | } |
771 | EXPORT_SYMBOL_GPL(__online_page_increment_counters); | |
180c06ef | 772 | |
9d0ad8ca DK |
773 | void __online_page_free(struct page *page) |
774 | { | |
3dcc0571 | 775 | __free_reserved_page(page); |
180c06ef | 776 | } |
9d0ad8ca DK |
777 | EXPORT_SYMBOL_GPL(__online_page_free); |
778 | ||
779 | static void generic_online_page(struct page *page) | |
780 | { | |
781 | __online_page_set_limits(page); | |
782 | __online_page_increment_counters(page); | |
783 | __online_page_free(page); | |
784 | } | |
180c06ef | 785 | |
75884fb1 KH |
786 | static int online_pages_range(unsigned long start_pfn, unsigned long nr_pages, |
787 | void *arg) | |
3947be19 DH |
788 | { |
789 | unsigned long i; | |
75884fb1 KH |
790 | unsigned long onlined_pages = *(unsigned long *)arg; |
791 | struct page *page; | |
792 | if (PageReserved(pfn_to_page(start_pfn))) | |
793 | for (i = 0; i < nr_pages; i++) { | |
794 | page = pfn_to_page(start_pfn + i); | |
9d0ad8ca | 795 | (*online_page_callback)(page); |
75884fb1 KH |
796 | onlined_pages++; |
797 | } | |
798 | *(unsigned long *)arg = onlined_pages; | |
799 | return 0; | |
800 | } | |
801 | ||
09285af7 | 802 | #ifdef CONFIG_MOVABLE_NODE |
79a4dcef TC |
803 | /* |
804 | * When CONFIG_MOVABLE_NODE, we permit onlining of a node which doesn't have | |
805 | * normal memory. | |
806 | */ | |
09285af7 LJ |
807 | static bool can_online_high_movable(struct zone *zone) |
808 | { | |
809 | return true; | |
810 | } | |
79a4dcef | 811 | #else /* CONFIG_MOVABLE_NODE */ |
74d42d8f LJ |
812 | /* ensure every online node has NORMAL memory */ |
813 | static bool can_online_high_movable(struct zone *zone) | |
814 | { | |
815 | return node_state(zone_to_nid(zone), N_NORMAL_MEMORY); | |
816 | } | |
79a4dcef | 817 | #endif /* CONFIG_MOVABLE_NODE */ |
74d42d8f | 818 | |
d9713679 LJ |
819 | /* check which state of node_states will be changed when online memory */ |
820 | static void node_states_check_changes_online(unsigned long nr_pages, | |
821 | struct zone *zone, struct memory_notify *arg) | |
822 | { | |
823 | int nid = zone_to_nid(zone); | |
824 | enum zone_type zone_last = ZONE_NORMAL; | |
825 | ||
826 | /* | |
6715ddf9 LJ |
827 | * If we have HIGHMEM or movable node, node_states[N_NORMAL_MEMORY] |
828 | * contains nodes which have zones of 0...ZONE_NORMAL, | |
829 | * set zone_last to ZONE_NORMAL. | |
d9713679 | 830 | * |
6715ddf9 LJ |
831 | * If we don't have HIGHMEM nor movable node, |
832 | * node_states[N_NORMAL_MEMORY] contains nodes which have zones of | |
833 | * 0...ZONE_MOVABLE, set zone_last to ZONE_MOVABLE. | |
d9713679 | 834 | */ |
6715ddf9 | 835 | if (N_MEMORY == N_NORMAL_MEMORY) |
d9713679 LJ |
836 | zone_last = ZONE_MOVABLE; |
837 | ||
838 | /* | |
839 | * if the memory to be online is in a zone of 0...zone_last, and | |
840 | * the zones of 0...zone_last don't have memory before online, we will | |
841 | * need to set the node to node_states[N_NORMAL_MEMORY] after | |
842 | * the memory is online. | |
843 | */ | |
844 | if (zone_idx(zone) <= zone_last && !node_state(nid, N_NORMAL_MEMORY)) | |
845 | arg->status_change_nid_normal = nid; | |
846 | else | |
847 | arg->status_change_nid_normal = -1; | |
848 | ||
6715ddf9 LJ |
849 | #ifdef CONFIG_HIGHMEM |
850 | /* | |
851 | * If we have movable node, node_states[N_HIGH_MEMORY] | |
852 | * contains nodes which have zones of 0...ZONE_HIGHMEM, | |
853 | * set zone_last to ZONE_HIGHMEM. | |
854 | * | |
855 | * If we don't have movable node, node_states[N_NORMAL_MEMORY] | |
856 | * contains nodes which have zones of 0...ZONE_MOVABLE, | |
857 | * set zone_last to ZONE_MOVABLE. | |
858 | */ | |
859 | zone_last = ZONE_HIGHMEM; | |
860 | if (N_MEMORY == N_HIGH_MEMORY) | |
861 | zone_last = ZONE_MOVABLE; | |
862 | ||
863 | if (zone_idx(zone) <= zone_last && !node_state(nid, N_HIGH_MEMORY)) | |
864 | arg->status_change_nid_high = nid; | |
865 | else | |
866 | arg->status_change_nid_high = -1; | |
867 | #else | |
868 | arg->status_change_nid_high = arg->status_change_nid_normal; | |
869 | #endif | |
870 | ||
d9713679 LJ |
871 | /* |
872 | * if the node don't have memory befor online, we will need to | |
6715ddf9 | 873 | * set the node to node_states[N_MEMORY] after the memory |
d9713679 LJ |
874 | * is online. |
875 | */ | |
6715ddf9 | 876 | if (!node_state(nid, N_MEMORY)) |
d9713679 LJ |
877 | arg->status_change_nid = nid; |
878 | else | |
879 | arg->status_change_nid = -1; | |
880 | } | |
881 | ||
882 | static void node_states_set_node(int node, struct memory_notify *arg) | |
883 | { | |
884 | if (arg->status_change_nid_normal >= 0) | |
885 | node_set_state(node, N_NORMAL_MEMORY); | |
886 | ||
6715ddf9 LJ |
887 | if (arg->status_change_nid_high >= 0) |
888 | node_set_state(node, N_HIGH_MEMORY); | |
889 | ||
890 | node_set_state(node, N_MEMORY); | |
d9713679 LJ |
891 | } |
892 | ||
75884fb1 | 893 | |
511c2aba | 894 | int __ref online_pages(unsigned long pfn, unsigned long nr_pages, int online_type) |
75884fb1 | 895 | { |
aa47228a | 896 | unsigned long flags; |
3947be19 DH |
897 | unsigned long onlined_pages = 0; |
898 | struct zone *zone; | |
6811378e | 899 | int need_zonelists_rebuild = 0; |
7b78d335 YG |
900 | int nid; |
901 | int ret; | |
902 | struct memory_notify arg; | |
903 | ||
925268a0 | 904 | lock_memory_hotplug(); |
d9713679 LJ |
905 | /* |
906 | * This doesn't need a lock to do pfn_to_page(). | |
907 | * The section can't be removed here because of the | |
908 | * memory_block->state_mutex. | |
909 | */ | |
910 | zone = page_zone(pfn_to_page(pfn)); | |
911 | ||
74d42d8f LJ |
912 | if ((zone_idx(zone) > ZONE_NORMAL || online_type == ONLINE_MOVABLE) && |
913 | !can_online_high_movable(zone)) { | |
914 | unlock_memory_hotplug(); | |
0a1be150 | 915 | return -EINVAL; |
74d42d8f LJ |
916 | } |
917 | ||
511c2aba LJ |
918 | if (online_type == ONLINE_KERNEL && zone_idx(zone) == ZONE_MOVABLE) { |
919 | if (move_pfn_range_left(zone - 1, zone, pfn, pfn + nr_pages)) { | |
920 | unlock_memory_hotplug(); | |
0a1be150 | 921 | return -EINVAL; |
511c2aba LJ |
922 | } |
923 | } | |
924 | if (online_type == ONLINE_MOVABLE && zone_idx(zone) == ZONE_MOVABLE - 1) { | |
925 | if (move_pfn_range_right(zone, zone + 1, pfn, pfn + nr_pages)) { | |
926 | unlock_memory_hotplug(); | |
0a1be150 | 927 | return -EINVAL; |
511c2aba LJ |
928 | } |
929 | } | |
930 | ||
931 | /* Previous code may changed the zone of the pfn range */ | |
932 | zone = page_zone(pfn_to_page(pfn)); | |
933 | ||
7b78d335 YG |
934 | arg.start_pfn = pfn; |
935 | arg.nr_pages = nr_pages; | |
d9713679 | 936 | node_states_check_changes_online(nr_pages, zone, &arg); |
7b78d335 YG |
937 | |
938 | nid = page_to_nid(pfn_to_page(pfn)); | |
3947be19 | 939 | |
7b78d335 YG |
940 | ret = memory_notify(MEM_GOING_ONLINE, &arg); |
941 | ret = notifier_to_errno(ret); | |
942 | if (ret) { | |
943 | memory_notify(MEM_CANCEL_ONLINE, &arg); | |
925268a0 | 944 | unlock_memory_hotplug(); |
7b78d335 YG |
945 | return ret; |
946 | } | |
6811378e YG |
947 | /* |
948 | * If this zone is not populated, then it is not in zonelist. | |
949 | * This means the page allocator ignores this zone. | |
950 | * So, zonelist must be updated after online. | |
951 | */ | |
4eaf3f64 | 952 | mutex_lock(&zonelists_mutex); |
6dcd73d7 | 953 | if (!populated_zone(zone)) { |
6811378e | 954 | need_zonelists_rebuild = 1; |
6dcd73d7 WC |
955 | build_all_zonelists(NULL, zone); |
956 | } | |
6811378e | 957 | |
908eedc6 | 958 | ret = walk_system_ram_range(pfn, nr_pages, &onlined_pages, |
75884fb1 | 959 | online_pages_range); |
fd8a4221 | 960 | if (ret) { |
6dcd73d7 WC |
961 | if (need_zonelists_rebuild) |
962 | zone_pcp_reset(zone); | |
4eaf3f64 | 963 | mutex_unlock(&zonelists_mutex); |
a62e2f4f BH |
964 | printk(KERN_DEBUG "online_pages [mem %#010llx-%#010llx] failed\n", |
965 | (unsigned long long) pfn << PAGE_SHIFT, | |
966 | (((unsigned long long) pfn + nr_pages) | |
967 | << PAGE_SHIFT) - 1); | |
fd8a4221 | 968 | memory_notify(MEM_CANCEL_ONLINE, &arg); |
925268a0 | 969 | unlock_memory_hotplug(); |
fd8a4221 GL |
970 | return ret; |
971 | } | |
972 | ||
3947be19 | 973 | zone->present_pages += onlined_pages; |
aa47228a CS |
974 | |
975 | pgdat_resize_lock(zone->zone_pgdat, &flags); | |
f2937be5 | 976 | zone->zone_pgdat->node_present_pages += onlined_pages; |
aa47228a CS |
977 | pgdat_resize_unlock(zone->zone_pgdat, &flags); |
978 | ||
08dff7b7 | 979 | if (onlined_pages) { |
d9713679 | 980 | node_states_set_node(zone_to_nid(zone), &arg); |
08dff7b7 | 981 | if (need_zonelists_rebuild) |
6dcd73d7 | 982 | build_all_zonelists(NULL, NULL); |
08dff7b7 JL |
983 | else |
984 | zone_pcp_update(zone); | |
985 | } | |
3947be19 | 986 | |
4eaf3f64 | 987 | mutex_unlock(&zonelists_mutex); |
1b79acc9 KM |
988 | |
989 | init_per_zone_wmark_min(); | |
990 | ||
08dff7b7 | 991 | if (onlined_pages) |
7ea1530a | 992 | kswapd_run(zone_to_nid(zone)); |
61b13993 | 993 | |
1f522509 | 994 | vm_total_pages = nr_free_pagecache_pages(); |
2f7f24ec | 995 | |
2d1d43f6 | 996 | writeback_set_ratelimit(); |
7b78d335 YG |
997 | |
998 | if (onlined_pages) | |
999 | memory_notify(MEM_ONLINE, &arg); | |
925268a0 | 1000 | unlock_memory_hotplug(); |
7b78d335 | 1001 | |
3947be19 DH |
1002 | return 0; |
1003 | } | |
53947027 | 1004 | #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ |
bc02af93 | 1005 | |
e1319331 HS |
1006 | /* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */ |
1007 | static pg_data_t __ref *hotadd_new_pgdat(int nid, u64 start) | |
9af3c2de YG |
1008 | { |
1009 | struct pglist_data *pgdat; | |
1010 | unsigned long zones_size[MAX_NR_ZONES] = {0}; | |
1011 | unsigned long zholes_size[MAX_NR_ZONES] = {0}; | |
1012 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
1013 | ||
a1e565aa TC |
1014 | pgdat = NODE_DATA(nid); |
1015 | if (!pgdat) { | |
1016 | pgdat = arch_alloc_nodedata(nid); | |
1017 | if (!pgdat) | |
1018 | return NULL; | |
9af3c2de | 1019 | |
a1e565aa TC |
1020 | arch_refresh_nodedata(nid, pgdat); |
1021 | } | |
9af3c2de YG |
1022 | |
1023 | /* we can use NODE_DATA(nid) from here */ | |
1024 | ||
1025 | /* init node's zones as empty zones, we don't have any present pages.*/ | |
9109fb7b | 1026 | free_area_init_node(nid, zones_size, start_pfn, zholes_size); |
9af3c2de | 1027 | |
959ecc48 KH |
1028 | /* |
1029 | * The node we allocated has no zone fallback lists. For avoiding | |
1030 | * to access not-initialized zonelist, build here. | |
1031 | */ | |
f957db4f | 1032 | mutex_lock(&zonelists_mutex); |
9adb62a5 | 1033 | build_all_zonelists(pgdat, NULL); |
f957db4f | 1034 | mutex_unlock(&zonelists_mutex); |
959ecc48 | 1035 | |
9af3c2de YG |
1036 | return pgdat; |
1037 | } | |
1038 | ||
1039 | static void rollback_node_hotadd(int nid, pg_data_t *pgdat) | |
1040 | { | |
1041 | arch_refresh_nodedata(nid, NULL); | |
1042 | arch_free_nodedata(pgdat); | |
1043 | return; | |
1044 | } | |
1045 | ||
0a547039 | 1046 | |
cf23422b | 1047 | /* |
1048 | * called by cpu_up() to online a node without onlined memory. | |
1049 | */ | |
1050 | int mem_online_node(int nid) | |
1051 | { | |
1052 | pg_data_t *pgdat; | |
1053 | int ret; | |
1054 | ||
20d6c96b | 1055 | lock_memory_hotplug(); |
cf23422b | 1056 | pgdat = hotadd_new_pgdat(nid, 0); |
7553e8f2 | 1057 | if (!pgdat) { |
cf23422b | 1058 | ret = -ENOMEM; |
1059 | goto out; | |
1060 | } | |
1061 | node_set_online(nid); | |
1062 | ret = register_one_node(nid); | |
1063 | BUG_ON(ret); | |
1064 | ||
1065 | out: | |
20d6c96b | 1066 | unlock_memory_hotplug(); |
cf23422b | 1067 | return ret; |
1068 | } | |
1069 | ||
27356f54 TK |
1070 | static int check_hotplug_memory_range(u64 start, u64 size) |
1071 | { | |
1072 | u64 start_pfn = start >> PAGE_SHIFT; | |
1073 | u64 nr_pages = size >> PAGE_SHIFT; | |
1074 | ||
1075 | /* Memory range must be aligned with section */ | |
1076 | if ((start_pfn & ~PAGE_SECTION_MASK) || | |
1077 | (nr_pages % PAGES_PER_SECTION) || (!nr_pages)) { | |
1078 | pr_err("Section-unaligned hotplug range: start 0x%llx, size 0x%llx\n", | |
1079 | (unsigned long long)start, | |
1080 | (unsigned long long)size); | |
1081 | return -EINVAL; | |
1082 | } | |
1083 | ||
1084 | return 0; | |
1085 | } | |
1086 | ||
31168481 AV |
1087 | /* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */ |
1088 | int __ref add_memory(int nid, u64 start, u64 size) | |
bc02af93 | 1089 | { |
9af3c2de | 1090 | pg_data_t *pgdat = NULL; |
a1e565aa TC |
1091 | bool new_pgdat; |
1092 | bool new_node; | |
ebd15302 | 1093 | struct resource *res; |
bc02af93 YG |
1094 | int ret; |
1095 | ||
27356f54 TK |
1096 | ret = check_hotplug_memory_range(start, size); |
1097 | if (ret) | |
1098 | return ret; | |
1099 | ||
20d6c96b | 1100 | lock_memory_hotplug(); |
6ad696d2 | 1101 | |
ebd15302 | 1102 | res = register_memory_resource(start, size); |
6ad696d2 | 1103 | ret = -EEXIST; |
ebd15302 | 1104 | if (!res) |
6ad696d2 | 1105 | goto out; |
ebd15302 | 1106 | |
a1e565aa TC |
1107 | { /* Stupid hack to suppress address-never-null warning */ |
1108 | void *p = NODE_DATA(nid); | |
1109 | new_pgdat = !p; | |
1110 | } | |
1111 | new_node = !node_online(nid); | |
1112 | if (new_node) { | |
9af3c2de | 1113 | pgdat = hotadd_new_pgdat(nid, start); |
6ad696d2 | 1114 | ret = -ENOMEM; |
9af3c2de | 1115 | if (!pgdat) |
41b9e2d7 | 1116 | goto error; |
9af3c2de YG |
1117 | } |
1118 | ||
bc02af93 YG |
1119 | /* call arch's memory hotadd */ |
1120 | ret = arch_add_memory(nid, start, size); | |
1121 | ||
9af3c2de YG |
1122 | if (ret < 0) |
1123 | goto error; | |
1124 | ||
0fc44159 | 1125 | /* we online node here. we can't roll back from here. */ |
9af3c2de YG |
1126 | node_set_online(nid); |
1127 | ||
a1e565aa | 1128 | if (new_node) { |
0fc44159 YG |
1129 | ret = register_one_node(nid); |
1130 | /* | |
1131 | * If sysfs file of new node can't create, cpu on the node | |
1132 | * can't be hot-added. There is no rollback way now. | |
1133 | * So, check by BUG_ON() to catch it reluctantly.. | |
1134 | */ | |
1135 | BUG_ON(ret); | |
1136 | } | |
1137 | ||
d96ae530 | 1138 | /* create new memmap entry */ |
1139 | firmware_map_add_hotplug(start, start + size, "System RAM"); | |
1140 | ||
6ad696d2 AK |
1141 | goto out; |
1142 | ||
9af3c2de YG |
1143 | error: |
1144 | /* rollback pgdat allocation and others */ | |
1145 | if (new_pgdat) | |
1146 | rollback_node_hotadd(nid, pgdat); | |
a864b9d0 | 1147 | release_memory_resource(res); |
9af3c2de | 1148 | |
6ad696d2 | 1149 | out: |
20d6c96b | 1150 | unlock_memory_hotplug(); |
bc02af93 YG |
1151 | return ret; |
1152 | } | |
1153 | EXPORT_SYMBOL_GPL(add_memory); | |
0c0e6195 KH |
1154 | |
1155 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
5c755e9f BP |
1156 | /* |
1157 | * A free page on the buddy free lists (not the per-cpu lists) has PageBuddy | |
1158 | * set and the size of the free page is given by page_order(). Using this, | |
1159 | * the function determines if the pageblock contains only free pages. | |
1160 | * Due to buddy contraints, a free page at least the size of a pageblock will | |
1161 | * be located at the start of the pageblock | |
1162 | */ | |
1163 | static inline int pageblock_free(struct page *page) | |
1164 | { | |
1165 | return PageBuddy(page) && page_order(page) >= pageblock_order; | |
1166 | } | |
1167 | ||
1168 | /* Return the start of the next active pageblock after a given page */ | |
1169 | static struct page *next_active_pageblock(struct page *page) | |
1170 | { | |
5c755e9f BP |
1171 | /* Ensure the starting page is pageblock-aligned */ |
1172 | BUG_ON(page_to_pfn(page) & (pageblock_nr_pages - 1)); | |
1173 | ||
5c755e9f | 1174 | /* If the entire pageblock is free, move to the end of free page */ |
0dcc48c1 KH |
1175 | if (pageblock_free(page)) { |
1176 | int order; | |
1177 | /* be careful. we don't have locks, page_order can be changed.*/ | |
1178 | order = page_order(page); | |
1179 | if ((order < MAX_ORDER) && (order >= pageblock_order)) | |
1180 | return page + (1 << order); | |
1181 | } | |
5c755e9f | 1182 | |
0dcc48c1 | 1183 | return page + pageblock_nr_pages; |
5c755e9f BP |
1184 | } |
1185 | ||
1186 | /* Checks if this range of memory is likely to be hot-removable. */ | |
1187 | int is_mem_section_removable(unsigned long start_pfn, unsigned long nr_pages) | |
1188 | { | |
5c755e9f BP |
1189 | struct page *page = pfn_to_page(start_pfn); |
1190 | struct page *end_page = page + nr_pages; | |
1191 | ||
1192 | /* Check the starting page of each pageblock within the range */ | |
1193 | for (; page < end_page; page = next_active_pageblock(page)) { | |
49ac8255 | 1194 | if (!is_pageblock_removable_nolock(page)) |
5c755e9f | 1195 | return 0; |
49ac8255 | 1196 | cond_resched(); |
5c755e9f BP |
1197 | } |
1198 | ||
1199 | /* All pageblocks in the memory block are likely to be hot-removable */ | |
1200 | return 1; | |
1201 | } | |
1202 | ||
0c0e6195 KH |
1203 | /* |
1204 | * Confirm all pages in a range [start, end) is belongs to the same zone. | |
1205 | */ | |
1206 | static int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn) | |
1207 | { | |
1208 | unsigned long pfn; | |
1209 | struct zone *zone = NULL; | |
1210 | struct page *page; | |
1211 | int i; | |
1212 | for (pfn = start_pfn; | |
1213 | pfn < end_pfn; | |
1214 | pfn += MAX_ORDER_NR_PAGES) { | |
1215 | i = 0; | |
1216 | /* This is just a CONFIG_HOLES_IN_ZONE check.*/ | |
1217 | while ((i < MAX_ORDER_NR_PAGES) && !pfn_valid_within(pfn + i)) | |
1218 | i++; | |
1219 | if (i == MAX_ORDER_NR_PAGES) | |
1220 | continue; | |
1221 | page = pfn_to_page(pfn + i); | |
1222 | if (zone && page_zone(page) != zone) | |
1223 | return 0; | |
1224 | zone = page_zone(page); | |
1225 | } | |
1226 | return 1; | |
1227 | } | |
1228 | ||
1229 | /* | |
c8721bbb NH |
1230 | * Scan pfn range [start,end) to find movable/migratable pages (LRU pages |
1231 | * and hugepages). We scan pfn because it's much easier than scanning over | |
1232 | * linked list. This function returns the pfn of the first found movable | |
1233 | * page if it's found, otherwise 0. | |
0c0e6195 | 1234 | */ |
c8721bbb | 1235 | static unsigned long scan_movable_pages(unsigned long start, unsigned long end) |
0c0e6195 KH |
1236 | { |
1237 | unsigned long pfn; | |
1238 | struct page *page; | |
1239 | for (pfn = start; pfn < end; pfn++) { | |
1240 | if (pfn_valid(pfn)) { | |
1241 | page = pfn_to_page(pfn); | |
1242 | if (PageLRU(page)) | |
1243 | return pfn; | |
c8721bbb NH |
1244 | if (PageHuge(page)) { |
1245 | if (is_hugepage_active(page)) | |
1246 | return pfn; | |
1247 | else | |
1248 | pfn = round_up(pfn + 1, | |
1249 | 1 << compound_order(page)) - 1; | |
1250 | } | |
0c0e6195 KH |
1251 | } |
1252 | } | |
1253 | return 0; | |
1254 | } | |
1255 | ||
0c0e6195 KH |
1256 | #define NR_OFFLINE_AT_ONCE_PAGES (256) |
1257 | static int | |
1258 | do_migrate_range(unsigned long start_pfn, unsigned long end_pfn) | |
1259 | { | |
1260 | unsigned long pfn; | |
1261 | struct page *page; | |
1262 | int move_pages = NR_OFFLINE_AT_ONCE_PAGES; | |
1263 | int not_managed = 0; | |
1264 | int ret = 0; | |
1265 | LIST_HEAD(source); | |
1266 | ||
1267 | for (pfn = start_pfn; pfn < end_pfn && move_pages > 0; pfn++) { | |
1268 | if (!pfn_valid(pfn)) | |
1269 | continue; | |
1270 | page = pfn_to_page(pfn); | |
c8721bbb NH |
1271 | |
1272 | if (PageHuge(page)) { | |
1273 | struct page *head = compound_head(page); | |
1274 | pfn = page_to_pfn(head) + (1<<compound_order(head)) - 1; | |
1275 | if (compound_order(head) > PFN_SECTION_SHIFT) { | |
1276 | ret = -EBUSY; | |
1277 | break; | |
1278 | } | |
1279 | if (isolate_huge_page(page, &source)) | |
1280 | move_pages -= 1 << compound_order(head); | |
1281 | continue; | |
1282 | } | |
1283 | ||
700c2a46 | 1284 | if (!get_page_unless_zero(page)) |
0c0e6195 KH |
1285 | continue; |
1286 | /* | |
1287 | * We can skip free pages. And we can only deal with pages on | |
1288 | * LRU. | |
1289 | */ | |
62695a84 | 1290 | ret = isolate_lru_page(page); |
0c0e6195 | 1291 | if (!ret) { /* Success */ |
700c2a46 | 1292 | put_page(page); |
62695a84 | 1293 | list_add_tail(&page->lru, &source); |
0c0e6195 | 1294 | move_pages--; |
6d9c285a KM |
1295 | inc_zone_page_state(page, NR_ISOLATED_ANON + |
1296 | page_is_file_cache(page)); | |
1297 | ||
0c0e6195 | 1298 | } else { |
0c0e6195 | 1299 | #ifdef CONFIG_DEBUG_VM |
718a3821 WF |
1300 | printk(KERN_ALERT "removing pfn %lx from LRU failed\n", |
1301 | pfn); | |
1302 | dump_page(page); | |
0c0e6195 | 1303 | #endif |
700c2a46 | 1304 | put_page(page); |
25985edc | 1305 | /* Because we don't have big zone->lock. we should |
809c4449 BL |
1306 | check this again here. */ |
1307 | if (page_count(page)) { | |
1308 | not_managed++; | |
f3ab2636 | 1309 | ret = -EBUSY; |
809c4449 BL |
1310 | break; |
1311 | } | |
0c0e6195 KH |
1312 | } |
1313 | } | |
f3ab2636 BL |
1314 | if (!list_empty(&source)) { |
1315 | if (not_managed) { | |
c8721bbb | 1316 | putback_movable_pages(&source); |
f3ab2636 BL |
1317 | goto out; |
1318 | } | |
74c08f98 MK |
1319 | |
1320 | /* | |
1321 | * alloc_migrate_target should be improooooved!! | |
1322 | * migrate_pages returns # of failed pages. | |
1323 | */ | |
1324 | ret = migrate_pages(&source, alloc_migrate_target, 0, | |
9c620e2b | 1325 | MIGRATE_SYNC, MR_MEMORY_HOTPLUG); |
f3ab2636 | 1326 | if (ret) |
c8721bbb | 1327 | putback_movable_pages(&source); |
0c0e6195 | 1328 | } |
0c0e6195 KH |
1329 | out: |
1330 | return ret; | |
1331 | } | |
1332 | ||
1333 | /* | |
1334 | * remove from free_area[] and mark all as Reserved. | |
1335 | */ | |
1336 | static int | |
1337 | offline_isolated_pages_cb(unsigned long start, unsigned long nr_pages, | |
1338 | void *data) | |
1339 | { | |
1340 | __offline_isolated_pages(start, start + nr_pages); | |
1341 | return 0; | |
1342 | } | |
1343 | ||
1344 | static void | |
1345 | offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn) | |
1346 | { | |
908eedc6 | 1347 | walk_system_ram_range(start_pfn, end_pfn - start_pfn, NULL, |
0c0e6195 KH |
1348 | offline_isolated_pages_cb); |
1349 | } | |
1350 | ||
1351 | /* | |
1352 | * Check all pages in range, recoreded as memory resource, are isolated. | |
1353 | */ | |
1354 | static int | |
1355 | check_pages_isolated_cb(unsigned long start_pfn, unsigned long nr_pages, | |
1356 | void *data) | |
1357 | { | |
1358 | int ret; | |
1359 | long offlined = *(long *)data; | |
b023f468 | 1360 | ret = test_pages_isolated(start_pfn, start_pfn + nr_pages, true); |
0c0e6195 KH |
1361 | offlined = nr_pages; |
1362 | if (!ret) | |
1363 | *(long *)data += offlined; | |
1364 | return ret; | |
1365 | } | |
1366 | ||
1367 | static long | |
1368 | check_pages_isolated(unsigned long start_pfn, unsigned long end_pfn) | |
1369 | { | |
1370 | long offlined = 0; | |
1371 | int ret; | |
1372 | ||
908eedc6 | 1373 | ret = walk_system_ram_range(start_pfn, end_pfn - start_pfn, &offlined, |
0c0e6195 KH |
1374 | check_pages_isolated_cb); |
1375 | if (ret < 0) | |
1376 | offlined = (long)ret; | |
1377 | return offlined; | |
1378 | } | |
1379 | ||
09285af7 | 1380 | #ifdef CONFIG_MOVABLE_NODE |
79a4dcef TC |
1381 | /* |
1382 | * When CONFIG_MOVABLE_NODE, we permit offlining of a node which doesn't have | |
1383 | * normal memory. | |
1384 | */ | |
09285af7 LJ |
1385 | static bool can_offline_normal(struct zone *zone, unsigned long nr_pages) |
1386 | { | |
1387 | return true; | |
1388 | } | |
79a4dcef | 1389 | #else /* CONFIG_MOVABLE_NODE */ |
74d42d8f LJ |
1390 | /* ensure the node has NORMAL memory if it is still online */ |
1391 | static bool can_offline_normal(struct zone *zone, unsigned long nr_pages) | |
1392 | { | |
1393 | struct pglist_data *pgdat = zone->zone_pgdat; | |
1394 | unsigned long present_pages = 0; | |
1395 | enum zone_type zt; | |
1396 | ||
1397 | for (zt = 0; zt <= ZONE_NORMAL; zt++) | |
1398 | present_pages += pgdat->node_zones[zt].present_pages; | |
1399 | ||
1400 | if (present_pages > nr_pages) | |
1401 | return true; | |
1402 | ||
1403 | present_pages = 0; | |
1404 | for (; zt <= ZONE_MOVABLE; zt++) | |
1405 | present_pages += pgdat->node_zones[zt].present_pages; | |
1406 | ||
1407 | /* | |
1408 | * we can't offline the last normal memory until all | |
1409 | * higher memory is offlined. | |
1410 | */ | |
1411 | return present_pages == 0; | |
1412 | } | |
79a4dcef | 1413 | #endif /* CONFIG_MOVABLE_NODE */ |
74d42d8f | 1414 | |
d9713679 LJ |
1415 | /* check which state of node_states will be changed when offline memory */ |
1416 | static void node_states_check_changes_offline(unsigned long nr_pages, | |
1417 | struct zone *zone, struct memory_notify *arg) | |
1418 | { | |
1419 | struct pglist_data *pgdat = zone->zone_pgdat; | |
1420 | unsigned long present_pages = 0; | |
1421 | enum zone_type zt, zone_last = ZONE_NORMAL; | |
1422 | ||
1423 | /* | |
6715ddf9 LJ |
1424 | * If we have HIGHMEM or movable node, node_states[N_NORMAL_MEMORY] |
1425 | * contains nodes which have zones of 0...ZONE_NORMAL, | |
1426 | * set zone_last to ZONE_NORMAL. | |
d9713679 | 1427 | * |
6715ddf9 LJ |
1428 | * If we don't have HIGHMEM nor movable node, |
1429 | * node_states[N_NORMAL_MEMORY] contains nodes which have zones of | |
1430 | * 0...ZONE_MOVABLE, set zone_last to ZONE_MOVABLE. | |
d9713679 | 1431 | */ |
6715ddf9 | 1432 | if (N_MEMORY == N_NORMAL_MEMORY) |
d9713679 LJ |
1433 | zone_last = ZONE_MOVABLE; |
1434 | ||
1435 | /* | |
1436 | * check whether node_states[N_NORMAL_MEMORY] will be changed. | |
1437 | * If the memory to be offline is in a zone of 0...zone_last, | |
1438 | * and it is the last present memory, 0...zone_last will | |
1439 | * become empty after offline , thus we can determind we will | |
1440 | * need to clear the node from node_states[N_NORMAL_MEMORY]. | |
1441 | */ | |
1442 | for (zt = 0; zt <= zone_last; zt++) | |
1443 | present_pages += pgdat->node_zones[zt].present_pages; | |
1444 | if (zone_idx(zone) <= zone_last && nr_pages >= present_pages) | |
1445 | arg->status_change_nid_normal = zone_to_nid(zone); | |
1446 | else | |
1447 | arg->status_change_nid_normal = -1; | |
1448 | ||
6715ddf9 LJ |
1449 | #ifdef CONFIG_HIGHMEM |
1450 | /* | |
1451 | * If we have movable node, node_states[N_HIGH_MEMORY] | |
1452 | * contains nodes which have zones of 0...ZONE_HIGHMEM, | |
1453 | * set zone_last to ZONE_HIGHMEM. | |
1454 | * | |
1455 | * If we don't have movable node, node_states[N_NORMAL_MEMORY] | |
1456 | * contains nodes which have zones of 0...ZONE_MOVABLE, | |
1457 | * set zone_last to ZONE_MOVABLE. | |
1458 | */ | |
1459 | zone_last = ZONE_HIGHMEM; | |
1460 | if (N_MEMORY == N_HIGH_MEMORY) | |
1461 | zone_last = ZONE_MOVABLE; | |
1462 | ||
1463 | for (; zt <= zone_last; zt++) | |
1464 | present_pages += pgdat->node_zones[zt].present_pages; | |
1465 | if (zone_idx(zone) <= zone_last && nr_pages >= present_pages) | |
1466 | arg->status_change_nid_high = zone_to_nid(zone); | |
1467 | else | |
1468 | arg->status_change_nid_high = -1; | |
1469 | #else | |
1470 | arg->status_change_nid_high = arg->status_change_nid_normal; | |
1471 | #endif | |
1472 | ||
d9713679 LJ |
1473 | /* |
1474 | * node_states[N_HIGH_MEMORY] contains nodes which have 0...ZONE_MOVABLE | |
1475 | */ | |
1476 | zone_last = ZONE_MOVABLE; | |
1477 | ||
1478 | /* | |
1479 | * check whether node_states[N_HIGH_MEMORY] will be changed | |
1480 | * If we try to offline the last present @nr_pages from the node, | |
1481 | * we can determind we will need to clear the node from | |
1482 | * node_states[N_HIGH_MEMORY]. | |
1483 | */ | |
1484 | for (; zt <= zone_last; zt++) | |
1485 | present_pages += pgdat->node_zones[zt].present_pages; | |
1486 | if (nr_pages >= present_pages) | |
1487 | arg->status_change_nid = zone_to_nid(zone); | |
1488 | else | |
1489 | arg->status_change_nid = -1; | |
1490 | } | |
1491 | ||
1492 | static void node_states_clear_node(int node, struct memory_notify *arg) | |
1493 | { | |
1494 | if (arg->status_change_nid_normal >= 0) | |
1495 | node_clear_state(node, N_NORMAL_MEMORY); | |
1496 | ||
6715ddf9 LJ |
1497 | if ((N_MEMORY != N_NORMAL_MEMORY) && |
1498 | (arg->status_change_nid_high >= 0)) | |
d9713679 | 1499 | node_clear_state(node, N_HIGH_MEMORY); |
6715ddf9 LJ |
1500 | |
1501 | if ((N_MEMORY != N_HIGH_MEMORY) && | |
1502 | (arg->status_change_nid >= 0)) | |
1503 | node_clear_state(node, N_MEMORY); | |
d9713679 LJ |
1504 | } |
1505 | ||
a16cee10 | 1506 | static int __ref __offline_pages(unsigned long start_pfn, |
0c0e6195 KH |
1507 | unsigned long end_pfn, unsigned long timeout) |
1508 | { | |
1509 | unsigned long pfn, nr_pages, expire; | |
1510 | long offlined_pages; | |
7b78d335 | 1511 | int ret, drain, retry_max, node; |
d702909f | 1512 | unsigned long flags; |
0c0e6195 | 1513 | struct zone *zone; |
7b78d335 | 1514 | struct memory_notify arg; |
0c0e6195 | 1515 | |
0c0e6195 KH |
1516 | /* at least, alignment against pageblock is necessary */ |
1517 | if (!IS_ALIGNED(start_pfn, pageblock_nr_pages)) | |
1518 | return -EINVAL; | |
1519 | if (!IS_ALIGNED(end_pfn, pageblock_nr_pages)) | |
1520 | return -EINVAL; | |
1521 | /* This makes hotplug much easier...and readable. | |
1522 | we assume this for now. .*/ | |
1523 | if (!test_pages_in_a_zone(start_pfn, end_pfn)) | |
1524 | return -EINVAL; | |
7b78d335 | 1525 | |
20d6c96b | 1526 | lock_memory_hotplug(); |
6ad696d2 | 1527 | |
7b78d335 YG |
1528 | zone = page_zone(pfn_to_page(start_pfn)); |
1529 | node = zone_to_nid(zone); | |
1530 | nr_pages = end_pfn - start_pfn; | |
1531 | ||
74d42d8f LJ |
1532 | ret = -EINVAL; |
1533 | if (zone_idx(zone) <= ZONE_NORMAL && !can_offline_normal(zone, nr_pages)) | |
1534 | goto out; | |
1535 | ||
0c0e6195 | 1536 | /* set above range as isolated */ |
b023f468 WC |
1537 | ret = start_isolate_page_range(start_pfn, end_pfn, |
1538 | MIGRATE_MOVABLE, true); | |
0c0e6195 | 1539 | if (ret) |
6ad696d2 | 1540 | goto out; |
7b78d335 YG |
1541 | |
1542 | arg.start_pfn = start_pfn; | |
1543 | arg.nr_pages = nr_pages; | |
d9713679 | 1544 | node_states_check_changes_offline(nr_pages, zone, &arg); |
7b78d335 YG |
1545 | |
1546 | ret = memory_notify(MEM_GOING_OFFLINE, &arg); | |
1547 | ret = notifier_to_errno(ret); | |
1548 | if (ret) | |
1549 | goto failed_removal; | |
1550 | ||
0c0e6195 KH |
1551 | pfn = start_pfn; |
1552 | expire = jiffies + timeout; | |
1553 | drain = 0; | |
1554 | retry_max = 5; | |
1555 | repeat: | |
1556 | /* start memory hot removal */ | |
1557 | ret = -EAGAIN; | |
1558 | if (time_after(jiffies, expire)) | |
1559 | goto failed_removal; | |
1560 | ret = -EINTR; | |
1561 | if (signal_pending(current)) | |
1562 | goto failed_removal; | |
1563 | ret = 0; | |
1564 | if (drain) { | |
1565 | lru_add_drain_all(); | |
0c0e6195 | 1566 | cond_resched(); |
9f8f2172 | 1567 | drain_all_pages(); |
0c0e6195 KH |
1568 | } |
1569 | ||
c8721bbb NH |
1570 | pfn = scan_movable_pages(start_pfn, end_pfn); |
1571 | if (pfn) { /* We have movable pages */ | |
0c0e6195 KH |
1572 | ret = do_migrate_range(pfn, end_pfn); |
1573 | if (!ret) { | |
1574 | drain = 1; | |
1575 | goto repeat; | |
1576 | } else { | |
1577 | if (ret < 0) | |
1578 | if (--retry_max == 0) | |
1579 | goto failed_removal; | |
1580 | yield(); | |
1581 | drain = 1; | |
1582 | goto repeat; | |
1583 | } | |
1584 | } | |
b3834be5 | 1585 | /* drain all zone's lru pagevec, this is asynchronous... */ |
0c0e6195 | 1586 | lru_add_drain_all(); |
0c0e6195 | 1587 | yield(); |
b3834be5 | 1588 | /* drain pcp pages, this is synchronous. */ |
9f8f2172 | 1589 | drain_all_pages(); |
c8721bbb NH |
1590 | /* |
1591 | * dissolve free hugepages in the memory block before doing offlining | |
1592 | * actually in order to make hugetlbfs's object counting consistent. | |
1593 | */ | |
1594 | dissolve_free_huge_pages(start_pfn, end_pfn); | |
0c0e6195 KH |
1595 | /* check again */ |
1596 | offlined_pages = check_pages_isolated(start_pfn, end_pfn); | |
1597 | if (offlined_pages < 0) { | |
1598 | ret = -EBUSY; | |
1599 | goto failed_removal; | |
1600 | } | |
1601 | printk(KERN_INFO "Offlined Pages %ld\n", offlined_pages); | |
b3834be5 | 1602 | /* Ok, all of our target is isolated. |
0c0e6195 KH |
1603 | We cannot do rollback at this point. */ |
1604 | offline_isolated_pages(start_pfn, end_pfn); | |
dbc0e4ce | 1605 | /* reset pagetype flags and makes migrate type to be MOVABLE */ |
0815f3d8 | 1606 | undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE); |
0c0e6195 | 1607 | /* removal success */ |
3dcc0571 | 1608 | adjust_managed_page_count(pfn_to_page(start_pfn), -offlined_pages); |
0c0e6195 | 1609 | zone->present_pages -= offlined_pages; |
d702909f CS |
1610 | |
1611 | pgdat_resize_lock(zone->zone_pgdat, &flags); | |
0c0e6195 | 1612 | zone->zone_pgdat->node_present_pages -= offlined_pages; |
d702909f | 1613 | pgdat_resize_unlock(zone->zone_pgdat, &flags); |
7b78d335 | 1614 | |
1b79acc9 KM |
1615 | init_per_zone_wmark_min(); |
1616 | ||
1e8537ba | 1617 | if (!populated_zone(zone)) { |
340175b7 | 1618 | zone_pcp_reset(zone); |
1e8537ba XQ |
1619 | mutex_lock(&zonelists_mutex); |
1620 | build_all_zonelists(NULL, NULL); | |
1621 | mutex_unlock(&zonelists_mutex); | |
1622 | } else | |
1623 | zone_pcp_update(zone); | |
340175b7 | 1624 | |
d9713679 LJ |
1625 | node_states_clear_node(node, &arg); |
1626 | if (arg.status_change_nid >= 0) | |
8fe23e05 | 1627 | kswapd_stop(node); |
bce7394a | 1628 | |
0c0e6195 KH |
1629 | vm_total_pages = nr_free_pagecache_pages(); |
1630 | writeback_set_ratelimit(); | |
7b78d335 YG |
1631 | |
1632 | memory_notify(MEM_OFFLINE, &arg); | |
20d6c96b | 1633 | unlock_memory_hotplug(); |
0c0e6195 KH |
1634 | return 0; |
1635 | ||
1636 | failed_removal: | |
a62e2f4f BH |
1637 | printk(KERN_INFO "memory offlining [mem %#010llx-%#010llx] failed\n", |
1638 | (unsigned long long) start_pfn << PAGE_SHIFT, | |
1639 | ((unsigned long long) end_pfn << PAGE_SHIFT) - 1); | |
7b78d335 | 1640 | memory_notify(MEM_CANCEL_OFFLINE, &arg); |
0c0e6195 | 1641 | /* pushback to free area */ |
0815f3d8 | 1642 | undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE); |
7b78d335 | 1643 | |
6ad696d2 | 1644 | out: |
20d6c96b | 1645 | unlock_memory_hotplug(); |
0c0e6195 KH |
1646 | return ret; |
1647 | } | |
71088785 | 1648 | |
a16cee10 WC |
1649 | int offline_pages(unsigned long start_pfn, unsigned long nr_pages) |
1650 | { | |
1651 | return __offline_pages(start_pfn, start_pfn + nr_pages, 120 * HZ); | |
1652 | } | |
e2ff3940 | 1653 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
a16cee10 | 1654 | |
bbc76be6 WC |
1655 | /** |
1656 | * walk_memory_range - walks through all mem sections in [start_pfn, end_pfn) | |
1657 | * @start_pfn: start pfn of the memory range | |
e05c4bbf | 1658 | * @end_pfn: end pfn of the memory range |
bbc76be6 WC |
1659 | * @arg: argument passed to func |
1660 | * @func: callback for each memory section walked | |
1661 | * | |
1662 | * This function walks through all present mem sections in range | |
1663 | * [start_pfn, end_pfn) and call func on each mem section. | |
1664 | * | |
1665 | * Returns the return value of func. | |
1666 | */ | |
e2ff3940 | 1667 | int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn, |
bbc76be6 | 1668 | void *arg, int (*func)(struct memory_block *, void *)) |
71088785 | 1669 | { |
e90bdb7f WC |
1670 | struct memory_block *mem = NULL; |
1671 | struct mem_section *section; | |
e90bdb7f WC |
1672 | unsigned long pfn, section_nr; |
1673 | int ret; | |
e90bdb7f WC |
1674 | |
1675 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { | |
1676 | section_nr = pfn_to_section_nr(pfn); | |
1677 | if (!present_section_nr(section_nr)) | |
1678 | continue; | |
1679 | ||
1680 | section = __nr_to_section(section_nr); | |
1681 | /* same memblock? */ | |
1682 | if (mem) | |
1683 | if ((section_nr >= mem->start_section_nr) && | |
1684 | (section_nr <= mem->end_section_nr)) | |
1685 | continue; | |
1686 | ||
1687 | mem = find_memory_block_hinted(section, mem); | |
1688 | if (!mem) | |
1689 | continue; | |
1690 | ||
bbc76be6 | 1691 | ret = func(mem, arg); |
e90bdb7f | 1692 | if (ret) { |
bbc76be6 WC |
1693 | kobject_put(&mem->dev.kobj); |
1694 | return ret; | |
e90bdb7f WC |
1695 | } |
1696 | } | |
1697 | ||
1698 | if (mem) | |
1699 | kobject_put(&mem->dev.kobj); | |
1700 | ||
bbc76be6 WC |
1701 | return 0; |
1702 | } | |
1703 | ||
e2ff3940 | 1704 | #ifdef CONFIG_MEMORY_HOTREMOVE |
bbc76be6 WC |
1705 | static int is_memblock_offlined_cb(struct memory_block *mem, void *arg) |
1706 | { | |
1707 | int ret = !is_memblock_offlined(mem); | |
1708 | ||
349daa0f RD |
1709 | if (unlikely(ret)) { |
1710 | phys_addr_t beginpa, endpa; | |
1711 | ||
1712 | beginpa = PFN_PHYS(section_nr_to_pfn(mem->start_section_nr)); | |
1713 | endpa = PFN_PHYS(section_nr_to_pfn(mem->end_section_nr + 1))-1; | |
bbc76be6 | 1714 | pr_warn("removing memory fails, because memory " |
349daa0f RD |
1715 | "[%pa-%pa] is onlined\n", |
1716 | &beginpa, &endpa); | |
1717 | } | |
bbc76be6 WC |
1718 | |
1719 | return ret; | |
1720 | } | |
1721 | ||
0f1cfe9d | 1722 | static int check_cpu_on_node(pg_data_t *pgdat) |
60a5a19e | 1723 | { |
60a5a19e TC |
1724 | int cpu; |
1725 | ||
1726 | for_each_present_cpu(cpu) { | |
1727 | if (cpu_to_node(cpu) == pgdat->node_id) | |
1728 | /* | |
1729 | * the cpu on this node isn't removed, and we can't | |
1730 | * offline this node. | |
1731 | */ | |
1732 | return -EBUSY; | |
1733 | } | |
1734 | ||
1735 | return 0; | |
1736 | } | |
1737 | ||
0f1cfe9d | 1738 | static void unmap_cpu_on_node(pg_data_t *pgdat) |
e13fe869 WC |
1739 | { |
1740 | #ifdef CONFIG_ACPI_NUMA | |
e13fe869 WC |
1741 | int cpu; |
1742 | ||
1743 | for_each_possible_cpu(cpu) | |
1744 | if (cpu_to_node(cpu) == pgdat->node_id) | |
1745 | numa_clear_node(cpu); | |
1746 | #endif | |
1747 | } | |
1748 | ||
0f1cfe9d | 1749 | static int check_and_unmap_cpu_on_node(pg_data_t *pgdat) |
e13fe869 | 1750 | { |
0f1cfe9d | 1751 | int ret; |
e13fe869 | 1752 | |
0f1cfe9d | 1753 | ret = check_cpu_on_node(pgdat); |
e13fe869 WC |
1754 | if (ret) |
1755 | return ret; | |
1756 | ||
1757 | /* | |
1758 | * the node will be offlined when we come here, so we can clear | |
1759 | * the cpu_to_node() now. | |
1760 | */ | |
1761 | ||
0f1cfe9d | 1762 | unmap_cpu_on_node(pgdat); |
e13fe869 WC |
1763 | return 0; |
1764 | } | |
1765 | ||
0f1cfe9d TK |
1766 | /** |
1767 | * try_offline_node | |
1768 | * | |
1769 | * Offline a node if all memory sections and cpus of the node are removed. | |
1770 | * | |
1771 | * NOTE: The caller must call lock_device_hotplug() to serialize hotplug | |
1772 | * and online/offline operations before this call. | |
1773 | */ | |
90b30cdc | 1774 | void try_offline_node(int nid) |
60a5a19e | 1775 | { |
d822b86a WC |
1776 | pg_data_t *pgdat = NODE_DATA(nid); |
1777 | unsigned long start_pfn = pgdat->node_start_pfn; | |
1778 | unsigned long end_pfn = start_pfn + pgdat->node_spanned_pages; | |
60a5a19e | 1779 | unsigned long pfn; |
d822b86a WC |
1780 | struct page *pgdat_page = virt_to_page(pgdat); |
1781 | int i; | |
60a5a19e TC |
1782 | |
1783 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { | |
1784 | unsigned long section_nr = pfn_to_section_nr(pfn); | |
1785 | ||
1786 | if (!present_section_nr(section_nr)) | |
1787 | continue; | |
1788 | ||
1789 | if (pfn_to_nid(pfn) != nid) | |
1790 | continue; | |
1791 | ||
1792 | /* | |
1793 | * some memory sections of this node are not removed, and we | |
1794 | * can't offline node now. | |
1795 | */ | |
1796 | return; | |
1797 | } | |
1798 | ||
0f1cfe9d | 1799 | if (check_and_unmap_cpu_on_node(pgdat)) |
60a5a19e TC |
1800 | return; |
1801 | ||
1802 | /* | |
1803 | * all memory/cpu of this node are removed, we can offline this | |
1804 | * node now. | |
1805 | */ | |
1806 | node_set_offline(nid); | |
1807 | unregister_one_node(nid); | |
d822b86a WC |
1808 | |
1809 | if (!PageSlab(pgdat_page) && !PageCompound(pgdat_page)) | |
1810 | /* node data is allocated from boot memory */ | |
1811 | return; | |
1812 | ||
1813 | /* free waittable in each zone */ | |
1814 | for (i = 0; i < MAX_NR_ZONES; i++) { | |
1815 | struct zone *zone = pgdat->node_zones + i; | |
1816 | ||
ca4b3f30 JW |
1817 | /* |
1818 | * wait_table may be allocated from boot memory, | |
1819 | * here only free if it's allocated by vmalloc. | |
1820 | */ | |
1821 | if (is_vmalloc_addr(zone->wait_table)) | |
d822b86a WC |
1822 | vfree(zone->wait_table); |
1823 | } | |
1824 | ||
1825 | /* | |
1826 | * Since there is no way to guarentee the address of pgdat/zone is not | |
1827 | * on stack of any kernel threads or used by other kernel objects | |
1828 | * without reference counting or other symchronizing method, do not | |
1829 | * reset node_data and free pgdat here. Just reset it to 0 and reuse | |
1830 | * the memory when the node is online again. | |
1831 | */ | |
1832 | memset(pgdat, 0, sizeof(*pgdat)); | |
60a5a19e | 1833 | } |
90b30cdc | 1834 | EXPORT_SYMBOL(try_offline_node); |
60a5a19e | 1835 | |
0f1cfe9d TK |
1836 | /** |
1837 | * remove_memory | |
1838 | * | |
1839 | * NOTE: The caller must call lock_device_hotplug() to serialize hotplug | |
1840 | * and online/offline operations before this call, as required by | |
1841 | * try_offline_node(). | |
1842 | */ | |
242831eb | 1843 | void __ref remove_memory(int nid, u64 start, u64 size) |
bbc76be6 | 1844 | { |
242831eb | 1845 | int ret; |
993c1aad | 1846 | |
27356f54 TK |
1847 | BUG_ON(check_hotplug_memory_range(start, size)); |
1848 | ||
6677e3ea YI |
1849 | lock_memory_hotplug(); |
1850 | ||
1851 | /* | |
242831eb RW |
1852 | * All memory blocks must be offlined before removing memory. Check |
1853 | * whether all memory blocks in question are offline and trigger a BUG() | |
1854 | * if this is not the case. | |
6677e3ea | 1855 | */ |
242831eb | 1856 | ret = walk_memory_range(PFN_DOWN(start), PFN_UP(start + size - 1), NULL, |
bbc76be6 WC |
1857 | is_memblock_offlined_cb); |
1858 | if (ret) { | |
1859 | unlock_memory_hotplug(); | |
242831eb | 1860 | BUG(); |
6677e3ea YI |
1861 | } |
1862 | ||
46c66c4b YI |
1863 | /* remove memmap entry */ |
1864 | firmware_map_remove(start, start + size, "System RAM"); | |
1865 | ||
24d335ca WC |
1866 | arch_remove_memory(start, size); |
1867 | ||
60a5a19e TC |
1868 | try_offline_node(nid); |
1869 | ||
6677e3ea | 1870 | unlock_memory_hotplug(); |
71088785 | 1871 | } |
71088785 | 1872 | EXPORT_SYMBOL_GPL(remove_memory); |
aba6efc4 | 1873 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |