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> | |
174cd4b1 | 9 | #include <linux/sched/signal.h> |
3947be19 DH |
10 | #include <linux/swap.h> |
11 | #include <linux/interrupt.h> | |
12 | #include <linux/pagemap.h> | |
3947be19 | 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> | |
4b94ffdc | 21 | #include <linux/memremap.h> |
3947be19 DH |
22 | #include <linux/memory_hotplug.h> |
23 | #include <linux/highmem.h> | |
24 | #include <linux/vmalloc.h> | |
0a547039 | 25 | #include <linux/ioport.h> |
0c0e6195 KH |
26 | #include <linux/delay.h> |
27 | #include <linux/migrate.h> | |
28 | #include <linux/page-isolation.h> | |
71088785 | 29 | #include <linux/pfn.h> |
6ad696d2 | 30 | #include <linux/suspend.h> |
6d9c285a | 31 | #include <linux/mm_inline.h> |
d96ae530 | 32 | #include <linux/firmware-map.h> |
60a5a19e | 33 | #include <linux/stop_machine.h> |
c8721bbb | 34 | #include <linux/hugetlb.h> |
c5320926 | 35 | #include <linux/memblock.h> |
f784a3f1 | 36 | #include <linux/bootmem.h> |
698b1b30 | 37 | #include <linux/compaction.h> |
3947be19 DH |
38 | |
39 | #include <asm/tlbflush.h> | |
40 | ||
1e5ad9a3 AB |
41 | #include "internal.h" |
42 | ||
9d0ad8ca DK |
43 | /* |
44 | * online_page_callback contains pointer to current page onlining function. | |
45 | * Initially it is generic_online_page(). If it is required it could be | |
46 | * changed by calling set_online_page_callback() for callback registration | |
47 | * and restore_online_page_callback() for generic callback restore. | |
48 | */ | |
49 | ||
50 | static void generic_online_page(struct page *page); | |
51 | ||
52 | static online_page_callback_t online_page_callback = generic_online_page; | |
bfc8c901 | 53 | static DEFINE_MUTEX(online_page_callback_lock); |
9d0ad8ca | 54 | |
3f906ba2 | 55 | DEFINE_STATIC_PERCPU_RWSEM(mem_hotplug_lock); |
bfc8c901 | 56 | |
3f906ba2 TG |
57 | void get_online_mems(void) |
58 | { | |
59 | percpu_down_read(&mem_hotplug_lock); | |
60 | } | |
bfc8c901 | 61 | |
3f906ba2 TG |
62 | void put_online_mems(void) |
63 | { | |
64 | percpu_up_read(&mem_hotplug_lock); | |
65 | } | |
bfc8c901 | 66 | |
4932381e MH |
67 | bool movable_node_enabled = false; |
68 | ||
8604d9e5 | 69 | #ifndef CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE |
31bc3858 | 70 | bool memhp_auto_online; |
8604d9e5 VK |
71 | #else |
72 | bool memhp_auto_online = true; | |
73 | #endif | |
31bc3858 VK |
74 | EXPORT_SYMBOL_GPL(memhp_auto_online); |
75 | ||
86dd995d VK |
76 | static int __init setup_memhp_default_state(char *str) |
77 | { | |
78 | if (!strcmp(str, "online")) | |
79 | memhp_auto_online = true; | |
80 | else if (!strcmp(str, "offline")) | |
81 | memhp_auto_online = false; | |
82 | ||
83 | return 1; | |
84 | } | |
85 | __setup("memhp_default_state=", setup_memhp_default_state); | |
86 | ||
30467e0b | 87 | void mem_hotplug_begin(void) |
20d6c96b | 88 | { |
3f906ba2 TG |
89 | cpus_read_lock(); |
90 | percpu_down_write(&mem_hotplug_lock); | |
20d6c96b KM |
91 | } |
92 | ||
30467e0b | 93 | void mem_hotplug_done(void) |
bfc8c901 | 94 | { |
3f906ba2 TG |
95 | percpu_up_write(&mem_hotplug_lock); |
96 | cpus_read_unlock(); | |
bfc8c901 | 97 | } |
20d6c96b | 98 | |
45e0b78b KM |
99 | /* add this memory to iomem resource */ |
100 | static struct resource *register_memory_resource(u64 start, u64 size) | |
101 | { | |
5042db43 | 102 | struct resource *res, *conflict; |
45e0b78b | 103 | res = kzalloc(sizeof(struct resource), GFP_KERNEL); |
6f754ba4 VK |
104 | if (!res) |
105 | return ERR_PTR(-ENOMEM); | |
45e0b78b KM |
106 | |
107 | res->name = "System RAM"; | |
108 | res->start = start; | |
109 | res->end = start + size - 1; | |
782b8664 | 110 | res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; |
5042db43 JG |
111 | conflict = request_resource_conflict(&iomem_resource, res); |
112 | if (conflict) { | |
113 | if (conflict->desc == IORES_DESC_DEVICE_PRIVATE_MEMORY) { | |
114 | pr_debug("Device unaddressable memory block " | |
115 | "memory hotplug at %#010llx !\n", | |
116 | (unsigned long long)start); | |
117 | } | |
4996eed8 | 118 | pr_debug("System RAM resource %pR cannot be added\n", res); |
45e0b78b | 119 | kfree(res); |
6f754ba4 | 120 | return ERR_PTR(-EEXIST); |
45e0b78b KM |
121 | } |
122 | return res; | |
123 | } | |
124 | ||
125 | static void release_memory_resource(struct resource *res) | |
126 | { | |
127 | if (!res) | |
128 | return; | |
129 | release_resource(res); | |
130 | kfree(res); | |
131 | return; | |
132 | } | |
133 | ||
53947027 | 134 | #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE |
46723bfa YI |
135 | void get_page_bootmem(unsigned long info, struct page *page, |
136 | unsigned long type) | |
04753278 | 137 | { |
ddffe98d | 138 | page->freelist = (void *)type; |
04753278 YG |
139 | SetPagePrivate(page); |
140 | set_page_private(page, info); | |
fe896d18 | 141 | page_ref_inc(page); |
04753278 YG |
142 | } |
143 | ||
170a5a7e | 144 | void put_page_bootmem(struct page *page) |
04753278 | 145 | { |
5f24ce5f | 146 | unsigned long type; |
04753278 | 147 | |
ddffe98d | 148 | type = (unsigned long) page->freelist; |
5f24ce5f AA |
149 | BUG_ON(type < MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE || |
150 | type > MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE); | |
04753278 | 151 | |
fe896d18 | 152 | if (page_ref_dec_return(page) == 1) { |
ddffe98d | 153 | page->freelist = NULL; |
04753278 YG |
154 | ClearPagePrivate(page); |
155 | set_page_private(page, 0); | |
5f24ce5f | 156 | INIT_LIST_HEAD(&page->lru); |
170a5a7e | 157 | free_reserved_page(page); |
04753278 | 158 | } |
04753278 YG |
159 | } |
160 | ||
46723bfa YI |
161 | #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE |
162 | #ifndef CONFIG_SPARSEMEM_VMEMMAP | |
d92bc318 | 163 | static void register_page_bootmem_info_section(unsigned long start_pfn) |
04753278 YG |
164 | { |
165 | unsigned long *usemap, mapsize, section_nr, i; | |
166 | struct mem_section *ms; | |
167 | struct page *page, *memmap; | |
168 | ||
04753278 YG |
169 | section_nr = pfn_to_section_nr(start_pfn); |
170 | ms = __nr_to_section(section_nr); | |
171 | ||
172 | /* Get section's memmap address */ | |
173 | memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); | |
174 | ||
175 | /* | |
176 | * Get page for the memmap's phys address | |
177 | * XXX: need more consideration for sparse_vmemmap... | |
178 | */ | |
179 | page = virt_to_page(memmap); | |
180 | mapsize = sizeof(struct page) * PAGES_PER_SECTION; | |
181 | mapsize = PAGE_ALIGN(mapsize) >> PAGE_SHIFT; | |
182 | ||
183 | /* remember memmap's page */ | |
184 | for (i = 0; i < mapsize; i++, page++) | |
185 | get_page_bootmem(section_nr, page, SECTION_INFO); | |
186 | ||
9ac9322d | 187 | usemap = ms->pageblock_flags; |
04753278 YG |
188 | page = virt_to_page(usemap); |
189 | ||
190 | mapsize = PAGE_ALIGN(usemap_size()) >> PAGE_SHIFT; | |
191 | ||
192 | for (i = 0; i < mapsize; i++, page++) | |
af370fb8 | 193 | get_page_bootmem(section_nr, page, MIX_SECTION_INFO); |
04753278 YG |
194 | |
195 | } | |
46723bfa YI |
196 | #else /* CONFIG_SPARSEMEM_VMEMMAP */ |
197 | static void register_page_bootmem_info_section(unsigned long start_pfn) | |
198 | { | |
199 | unsigned long *usemap, mapsize, section_nr, i; | |
200 | struct mem_section *ms; | |
201 | struct page *page, *memmap; | |
202 | ||
46723bfa YI |
203 | section_nr = pfn_to_section_nr(start_pfn); |
204 | ms = __nr_to_section(section_nr); | |
205 | ||
206 | memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); | |
207 | ||
208 | register_page_bootmem_memmap(section_nr, memmap, PAGES_PER_SECTION); | |
209 | ||
9ac9322d | 210 | usemap = ms->pageblock_flags; |
46723bfa YI |
211 | page = virt_to_page(usemap); |
212 | ||
213 | mapsize = PAGE_ALIGN(usemap_size()) >> PAGE_SHIFT; | |
214 | ||
215 | for (i = 0; i < mapsize; i++, page++) | |
216 | get_page_bootmem(section_nr, page, MIX_SECTION_INFO); | |
217 | } | |
218 | #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ | |
04753278 | 219 | |
7ded384a | 220 | void __init register_page_bootmem_info_node(struct pglist_data *pgdat) |
04753278 YG |
221 | { |
222 | unsigned long i, pfn, end_pfn, nr_pages; | |
223 | int node = pgdat->node_id; | |
224 | struct page *page; | |
04753278 YG |
225 | |
226 | nr_pages = PAGE_ALIGN(sizeof(struct pglist_data)) >> PAGE_SHIFT; | |
227 | page = virt_to_page(pgdat); | |
228 | ||
229 | for (i = 0; i < nr_pages; i++, page++) | |
230 | get_page_bootmem(node, page, NODE_INFO); | |
231 | ||
04753278 | 232 | pfn = pgdat->node_start_pfn; |
c1f19495 | 233 | end_pfn = pgdat_end_pfn(pgdat); |
04753278 | 234 | |
7e9f5eb0 | 235 | /* register section info */ |
f14851af | 236 | for (; pfn < end_pfn; pfn += PAGES_PER_SECTION) { |
237 | /* | |
238 | * Some platforms can assign the same pfn to multiple nodes - on | |
239 | * node0 as well as nodeN. To avoid registering a pfn against | |
240 | * multiple nodes we check that this pfn does not already | |
7e9f5eb0 | 241 | * reside in some other nodes. |
f14851af | 242 | */ |
f65e91df | 243 | if (pfn_valid(pfn) && (early_pfn_to_nid(pfn) == node)) |
f14851af | 244 | register_page_bootmem_info_section(pfn); |
245 | } | |
04753278 | 246 | } |
46723bfa | 247 | #endif /* CONFIG_HAVE_BOOTMEM_INFO_NODE */ |
04753278 | 248 | |
f1dd2cd1 | 249 | static int __meminit __add_section(int nid, unsigned long phys_start_pfn, |
7b73d978 | 250 | struct vmem_altmap *altmap, bool want_memblock) |
3947be19 | 251 | { |
3947be19 | 252 | int ret; |
f1dd2cd1 | 253 | int i; |
3947be19 | 254 | |
ebd15302 KH |
255 | if (pfn_valid(phys_start_pfn)) |
256 | return -EEXIST; | |
257 | ||
7b73d978 | 258 | ret = sparse_add_one_section(NODE_DATA(nid), phys_start_pfn, altmap); |
3947be19 DH |
259 | if (ret < 0) |
260 | return ret; | |
261 | ||
f1dd2cd1 MH |
262 | /* |
263 | * Make all the pages reserved so that nobody will stumble over half | |
264 | * initialized state. | |
1b7176ae | 265 | * FIXME: We also have to associate it with a node because page_to_nid |
f1dd2cd1 MH |
266 | * relies on having page with the proper node. |
267 | */ | |
268 | for (i = 0; i < PAGES_PER_SECTION; i++) { | |
269 | unsigned long pfn = phys_start_pfn + i; | |
270 | struct page *page; | |
271 | if (!pfn_valid(pfn)) | |
272 | continue; | |
718127cc | 273 | |
f1dd2cd1 MH |
274 | page = pfn_to_page(pfn); |
275 | set_page_node(page, nid); | |
276 | SetPageReserved(page); | |
277 | } | |
718127cc | 278 | |
1b862aec MH |
279 | if (!want_memblock) |
280 | return 0; | |
281 | ||
c04fc586 | 282 | return register_new_memory(nid, __pfn_to_section(phys_start_pfn)); |
3947be19 DH |
283 | } |
284 | ||
4edd7cef DR |
285 | /* |
286 | * Reasonably generic function for adding memory. It is | |
287 | * expected that archs that support memory hotplug will | |
288 | * call this function after deciding the zone to which to | |
289 | * add the new pages. | |
290 | */ | |
f1dd2cd1 | 291 | int __ref __add_pages(int nid, unsigned long phys_start_pfn, |
24e6d5a5 CH |
292 | unsigned long nr_pages, struct vmem_altmap *altmap, |
293 | bool want_memblock) | |
4edd7cef DR |
294 | { |
295 | unsigned long i; | |
296 | int err = 0; | |
297 | int start_sec, end_sec; | |
4b94ffdc | 298 | |
4edd7cef DR |
299 | /* during initialize mem_map, align hot-added range to section */ |
300 | start_sec = pfn_to_section_nr(phys_start_pfn); | |
301 | end_sec = pfn_to_section_nr(phys_start_pfn + nr_pages - 1); | |
302 | ||
4b94ffdc DW |
303 | if (altmap) { |
304 | /* | |
305 | * Validate altmap is within bounds of the total request | |
306 | */ | |
307 | if (altmap->base_pfn != phys_start_pfn | |
308 | || vmem_altmap_offset(altmap) > nr_pages) { | |
309 | pr_warn_once("memory add fail, invalid altmap\n"); | |
7cf91a98 JK |
310 | err = -EINVAL; |
311 | goto out; | |
4b94ffdc DW |
312 | } |
313 | altmap->alloc = 0; | |
314 | } | |
315 | ||
4edd7cef | 316 | for (i = start_sec; i <= end_sec; i++) { |
7b73d978 CH |
317 | err = __add_section(nid, section_nr_to_pfn(i), altmap, |
318 | want_memblock); | |
4edd7cef DR |
319 | |
320 | /* | |
321 | * EEXIST is finally dealt with by ioresource collision | |
322 | * check. see add_memory() => register_memory_resource() | |
323 | * Warning will be printed if there is collision. | |
324 | */ | |
325 | if (err && (err != -EEXIST)) | |
326 | break; | |
327 | err = 0; | |
f64ac5e6 | 328 | cond_resched(); |
4edd7cef | 329 | } |
c435a390 | 330 | vmemmap_populate_print_last(); |
7cf91a98 | 331 | out: |
4edd7cef DR |
332 | return err; |
333 | } | |
4edd7cef DR |
334 | |
335 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
815121d2 | 336 | /* find the smallest valid pfn in the range [start_pfn, end_pfn) */ |
d09b0137 | 337 | static unsigned long find_smallest_section_pfn(int nid, struct zone *zone, |
815121d2 YI |
338 | unsigned long start_pfn, |
339 | unsigned long end_pfn) | |
340 | { | |
341 | struct mem_section *ms; | |
342 | ||
343 | for (; start_pfn < end_pfn; start_pfn += PAGES_PER_SECTION) { | |
344 | ms = __pfn_to_section(start_pfn); | |
345 | ||
346 | if (unlikely(!valid_section(ms))) | |
347 | continue; | |
348 | ||
349 | if (unlikely(pfn_to_nid(start_pfn) != nid)) | |
350 | continue; | |
351 | ||
352 | if (zone && zone != page_zone(pfn_to_page(start_pfn))) | |
353 | continue; | |
354 | ||
355 | return start_pfn; | |
356 | } | |
357 | ||
358 | return 0; | |
359 | } | |
360 | ||
361 | /* find the biggest valid pfn in the range [start_pfn, end_pfn). */ | |
d09b0137 | 362 | static unsigned long find_biggest_section_pfn(int nid, struct zone *zone, |
815121d2 YI |
363 | unsigned long start_pfn, |
364 | unsigned long end_pfn) | |
365 | { | |
366 | struct mem_section *ms; | |
367 | unsigned long pfn; | |
368 | ||
369 | /* pfn is the end pfn of a memory section. */ | |
370 | pfn = end_pfn - 1; | |
371 | for (; pfn >= start_pfn; pfn -= PAGES_PER_SECTION) { | |
372 | ms = __pfn_to_section(pfn); | |
373 | ||
374 | if (unlikely(!valid_section(ms))) | |
375 | continue; | |
376 | ||
377 | if (unlikely(pfn_to_nid(pfn) != nid)) | |
378 | continue; | |
379 | ||
380 | if (zone && zone != page_zone(pfn_to_page(pfn))) | |
381 | continue; | |
382 | ||
383 | return pfn; | |
384 | } | |
385 | ||
386 | return 0; | |
387 | } | |
388 | ||
389 | static void shrink_zone_span(struct zone *zone, unsigned long start_pfn, | |
390 | unsigned long end_pfn) | |
391 | { | |
c33bc315 XQ |
392 | unsigned long zone_start_pfn = zone->zone_start_pfn; |
393 | unsigned long z = zone_end_pfn(zone); /* zone_end_pfn namespace clash */ | |
394 | unsigned long zone_end_pfn = z; | |
815121d2 YI |
395 | unsigned long pfn; |
396 | struct mem_section *ms; | |
397 | int nid = zone_to_nid(zone); | |
398 | ||
399 | zone_span_writelock(zone); | |
400 | if (zone_start_pfn == start_pfn) { | |
401 | /* | |
402 | * If the section is smallest section in the zone, it need | |
403 | * shrink zone->zone_start_pfn and zone->zone_spanned_pages. | |
404 | * In this case, we find second smallest valid mem_section | |
405 | * for shrinking zone. | |
406 | */ | |
407 | pfn = find_smallest_section_pfn(nid, zone, end_pfn, | |
408 | zone_end_pfn); | |
409 | if (pfn) { | |
410 | zone->zone_start_pfn = pfn; | |
411 | zone->spanned_pages = zone_end_pfn - pfn; | |
412 | } | |
413 | } else if (zone_end_pfn == end_pfn) { | |
414 | /* | |
415 | * If the section is biggest section in the zone, it need | |
416 | * shrink zone->spanned_pages. | |
417 | * In this case, we find second biggest valid mem_section for | |
418 | * shrinking zone. | |
419 | */ | |
420 | pfn = find_biggest_section_pfn(nid, zone, zone_start_pfn, | |
421 | start_pfn); | |
422 | if (pfn) | |
423 | zone->spanned_pages = pfn - zone_start_pfn + 1; | |
424 | } | |
425 | ||
426 | /* | |
427 | * The section is not biggest or smallest mem_section in the zone, it | |
428 | * only creates a hole in the zone. So in this case, we need not | |
429 | * change the zone. But perhaps, the zone has only hole data. Thus | |
430 | * it check the zone has only hole or not. | |
431 | */ | |
432 | pfn = zone_start_pfn; | |
433 | for (; pfn < zone_end_pfn; pfn += PAGES_PER_SECTION) { | |
434 | ms = __pfn_to_section(pfn); | |
435 | ||
436 | if (unlikely(!valid_section(ms))) | |
437 | continue; | |
438 | ||
439 | if (page_zone(pfn_to_page(pfn)) != zone) | |
440 | continue; | |
441 | ||
442 | /* If the section is current section, it continues the loop */ | |
443 | if (start_pfn == pfn) | |
444 | continue; | |
445 | ||
446 | /* If we find valid section, we have nothing to do */ | |
447 | zone_span_writeunlock(zone); | |
448 | return; | |
449 | } | |
450 | ||
451 | /* The zone has no valid section */ | |
452 | zone->zone_start_pfn = 0; | |
453 | zone->spanned_pages = 0; | |
454 | zone_span_writeunlock(zone); | |
455 | } | |
456 | ||
457 | static void shrink_pgdat_span(struct pglist_data *pgdat, | |
458 | unsigned long start_pfn, unsigned long end_pfn) | |
459 | { | |
83285c72 XQ |
460 | unsigned long pgdat_start_pfn = pgdat->node_start_pfn; |
461 | unsigned long p = pgdat_end_pfn(pgdat); /* pgdat_end_pfn namespace clash */ | |
462 | unsigned long pgdat_end_pfn = p; | |
815121d2 YI |
463 | unsigned long pfn; |
464 | struct mem_section *ms; | |
465 | int nid = pgdat->node_id; | |
466 | ||
467 | if (pgdat_start_pfn == start_pfn) { | |
468 | /* | |
469 | * If the section is smallest section in the pgdat, it need | |
470 | * shrink pgdat->node_start_pfn and pgdat->node_spanned_pages. | |
471 | * In this case, we find second smallest valid mem_section | |
472 | * for shrinking zone. | |
473 | */ | |
474 | pfn = find_smallest_section_pfn(nid, NULL, end_pfn, | |
475 | pgdat_end_pfn); | |
476 | if (pfn) { | |
477 | pgdat->node_start_pfn = pfn; | |
478 | pgdat->node_spanned_pages = pgdat_end_pfn - pfn; | |
479 | } | |
480 | } else if (pgdat_end_pfn == end_pfn) { | |
481 | /* | |
482 | * If the section is biggest section in the pgdat, it need | |
483 | * shrink pgdat->node_spanned_pages. | |
484 | * In this case, we find second biggest valid mem_section for | |
485 | * shrinking zone. | |
486 | */ | |
487 | pfn = find_biggest_section_pfn(nid, NULL, pgdat_start_pfn, | |
488 | start_pfn); | |
489 | if (pfn) | |
490 | pgdat->node_spanned_pages = pfn - pgdat_start_pfn + 1; | |
491 | } | |
492 | ||
493 | /* | |
494 | * If the section is not biggest or smallest mem_section in the pgdat, | |
495 | * it only creates a hole in the pgdat. So in this case, we need not | |
496 | * change the pgdat. | |
497 | * But perhaps, the pgdat has only hole data. Thus it check the pgdat | |
498 | * has only hole or not. | |
499 | */ | |
500 | pfn = pgdat_start_pfn; | |
501 | for (; pfn < pgdat_end_pfn; pfn += PAGES_PER_SECTION) { | |
502 | ms = __pfn_to_section(pfn); | |
503 | ||
504 | if (unlikely(!valid_section(ms))) | |
505 | continue; | |
506 | ||
507 | if (pfn_to_nid(pfn) != nid) | |
508 | continue; | |
509 | ||
510 | /* If the section is current section, it continues the loop */ | |
511 | if (start_pfn == pfn) | |
512 | continue; | |
513 | ||
514 | /* If we find valid section, we have nothing to do */ | |
515 | return; | |
516 | } | |
517 | ||
518 | /* The pgdat has no valid section */ | |
519 | pgdat->node_start_pfn = 0; | |
520 | pgdat->node_spanned_pages = 0; | |
521 | } | |
522 | ||
523 | static void __remove_zone(struct zone *zone, unsigned long start_pfn) | |
524 | { | |
525 | struct pglist_data *pgdat = zone->zone_pgdat; | |
526 | int nr_pages = PAGES_PER_SECTION; | |
815121d2 YI |
527 | unsigned long flags; |
528 | ||
815121d2 YI |
529 | pgdat_resize_lock(zone->zone_pgdat, &flags); |
530 | shrink_zone_span(zone, start_pfn, start_pfn + nr_pages); | |
531 | shrink_pgdat_span(pgdat, start_pfn, start_pfn + nr_pages); | |
532 | pgdat_resize_unlock(zone->zone_pgdat, &flags); | |
533 | } | |
534 | ||
4b94ffdc | 535 | static int __remove_section(struct zone *zone, struct mem_section *ms, |
24b6d416 | 536 | unsigned long map_offset, struct vmem_altmap *altmap) |
ea01ea93 | 537 | { |
815121d2 YI |
538 | unsigned long start_pfn; |
539 | int scn_nr; | |
ea01ea93 BP |
540 | int ret = -EINVAL; |
541 | ||
542 | if (!valid_section(ms)) | |
543 | return ret; | |
544 | ||
545 | ret = unregister_memory_section(ms); | |
546 | if (ret) | |
547 | return ret; | |
548 | ||
815121d2 | 549 | scn_nr = __section_nr(ms); |
1dd2bfc8 | 550 | start_pfn = section_nr_to_pfn((unsigned long)scn_nr); |
815121d2 YI |
551 | __remove_zone(zone, start_pfn); |
552 | ||
24b6d416 | 553 | sparse_remove_one_section(zone, ms, map_offset, altmap); |
ea01ea93 BP |
554 | return 0; |
555 | } | |
556 | ||
ea01ea93 BP |
557 | /** |
558 | * __remove_pages() - remove sections of pages from a zone | |
559 | * @zone: zone from which pages need to be removed | |
560 | * @phys_start_pfn: starting pageframe (must be aligned to start of a section) | |
561 | * @nr_pages: number of pages to remove (must be multiple of section size) | |
562 | * | |
563 | * Generic helper function to remove section mappings and sysfs entries | |
564 | * for the section of the memory we are removing. Caller needs to make | |
565 | * sure that pages are marked reserved and zones are adjust properly by | |
566 | * calling offline_pages(). | |
567 | */ | |
568 | int __remove_pages(struct zone *zone, unsigned long phys_start_pfn, | |
da024512 | 569 | unsigned long nr_pages, struct vmem_altmap *altmap) |
ea01ea93 | 570 | { |
fe74ebb1 | 571 | unsigned long i; |
4b94ffdc DW |
572 | unsigned long map_offset = 0; |
573 | int sections_to_remove, ret = 0; | |
574 | ||
575 | /* In the ZONE_DEVICE case device driver owns the memory region */ | |
576 | if (is_dev_zone(zone)) { | |
4b94ffdc DW |
577 | if (altmap) |
578 | map_offset = vmem_altmap_offset(altmap); | |
579 | } else { | |
580 | resource_size_t start, size; | |
581 | ||
582 | start = phys_start_pfn << PAGE_SHIFT; | |
583 | size = nr_pages * PAGE_SIZE; | |
584 | ||
585 | ret = release_mem_region_adjustable(&iomem_resource, start, | |
586 | size); | |
587 | if (ret) { | |
588 | resource_size_t endres = start + size - 1; | |
589 | ||
590 | pr_warn("Unable to release resource <%pa-%pa> (%d)\n", | |
591 | &start, &endres, ret); | |
592 | } | |
593 | } | |
ea01ea93 | 594 | |
7cf91a98 JK |
595 | clear_zone_contiguous(zone); |
596 | ||
ea01ea93 BP |
597 | /* |
598 | * We can only remove entire sections | |
599 | */ | |
600 | BUG_ON(phys_start_pfn & ~PAGE_SECTION_MASK); | |
601 | BUG_ON(nr_pages % PAGES_PER_SECTION); | |
602 | ||
ea01ea93 BP |
603 | sections_to_remove = nr_pages / PAGES_PER_SECTION; |
604 | for (i = 0; i < sections_to_remove; i++) { | |
605 | unsigned long pfn = phys_start_pfn + i*PAGES_PER_SECTION; | |
4b94ffdc | 606 | |
24b6d416 CH |
607 | ret = __remove_section(zone, __pfn_to_section(pfn), map_offset, |
608 | altmap); | |
4b94ffdc | 609 | map_offset = 0; |
ea01ea93 BP |
610 | if (ret) |
611 | break; | |
612 | } | |
7cf91a98 JK |
613 | |
614 | set_zone_contiguous(zone); | |
615 | ||
ea01ea93 BP |
616 | return ret; |
617 | } | |
4edd7cef | 618 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
ea01ea93 | 619 | |
9d0ad8ca DK |
620 | int set_online_page_callback(online_page_callback_t callback) |
621 | { | |
622 | int rc = -EINVAL; | |
623 | ||
bfc8c901 VD |
624 | get_online_mems(); |
625 | mutex_lock(&online_page_callback_lock); | |
9d0ad8ca DK |
626 | |
627 | if (online_page_callback == generic_online_page) { | |
628 | online_page_callback = callback; | |
629 | rc = 0; | |
630 | } | |
631 | ||
bfc8c901 VD |
632 | mutex_unlock(&online_page_callback_lock); |
633 | put_online_mems(); | |
9d0ad8ca DK |
634 | |
635 | return rc; | |
636 | } | |
637 | EXPORT_SYMBOL_GPL(set_online_page_callback); | |
638 | ||
639 | int restore_online_page_callback(online_page_callback_t callback) | |
640 | { | |
641 | int rc = -EINVAL; | |
642 | ||
bfc8c901 VD |
643 | get_online_mems(); |
644 | mutex_lock(&online_page_callback_lock); | |
9d0ad8ca DK |
645 | |
646 | if (online_page_callback == callback) { | |
647 | online_page_callback = generic_online_page; | |
648 | rc = 0; | |
649 | } | |
650 | ||
bfc8c901 VD |
651 | mutex_unlock(&online_page_callback_lock); |
652 | put_online_mems(); | |
9d0ad8ca DK |
653 | |
654 | return rc; | |
655 | } | |
656 | EXPORT_SYMBOL_GPL(restore_online_page_callback); | |
657 | ||
658 | void __online_page_set_limits(struct page *page) | |
180c06ef | 659 | { |
9d0ad8ca DK |
660 | } |
661 | EXPORT_SYMBOL_GPL(__online_page_set_limits); | |
662 | ||
663 | void __online_page_increment_counters(struct page *page) | |
664 | { | |
3dcc0571 | 665 | adjust_managed_page_count(page, 1); |
9d0ad8ca DK |
666 | } |
667 | EXPORT_SYMBOL_GPL(__online_page_increment_counters); | |
180c06ef | 668 | |
9d0ad8ca DK |
669 | void __online_page_free(struct page *page) |
670 | { | |
3dcc0571 | 671 | __free_reserved_page(page); |
180c06ef | 672 | } |
9d0ad8ca DK |
673 | EXPORT_SYMBOL_GPL(__online_page_free); |
674 | ||
675 | static void generic_online_page(struct page *page) | |
676 | { | |
677 | __online_page_set_limits(page); | |
678 | __online_page_increment_counters(page); | |
679 | __online_page_free(page); | |
680 | } | |
180c06ef | 681 | |
75884fb1 KH |
682 | static int online_pages_range(unsigned long start_pfn, unsigned long nr_pages, |
683 | void *arg) | |
3947be19 DH |
684 | { |
685 | unsigned long i; | |
75884fb1 KH |
686 | unsigned long onlined_pages = *(unsigned long *)arg; |
687 | struct page *page; | |
2d070eab | 688 | |
75884fb1 KH |
689 | if (PageReserved(pfn_to_page(start_pfn))) |
690 | for (i = 0; i < nr_pages; i++) { | |
691 | page = pfn_to_page(start_pfn + i); | |
9d0ad8ca | 692 | (*online_page_callback)(page); |
75884fb1 KH |
693 | onlined_pages++; |
694 | } | |
2d070eab MH |
695 | |
696 | online_mem_sections(start_pfn, start_pfn + nr_pages); | |
697 | ||
75884fb1 KH |
698 | *(unsigned long *)arg = onlined_pages; |
699 | return 0; | |
700 | } | |
701 | ||
d9713679 LJ |
702 | /* check which state of node_states will be changed when online memory */ |
703 | static void node_states_check_changes_online(unsigned long nr_pages, | |
704 | struct zone *zone, struct memory_notify *arg) | |
705 | { | |
706 | int nid = zone_to_nid(zone); | |
707 | enum zone_type zone_last = ZONE_NORMAL; | |
708 | ||
709 | /* | |
6715ddf9 LJ |
710 | * If we have HIGHMEM or movable node, node_states[N_NORMAL_MEMORY] |
711 | * contains nodes which have zones of 0...ZONE_NORMAL, | |
712 | * set zone_last to ZONE_NORMAL. | |
d9713679 | 713 | * |
6715ddf9 LJ |
714 | * If we don't have HIGHMEM nor movable node, |
715 | * node_states[N_NORMAL_MEMORY] contains nodes which have zones of | |
716 | * 0...ZONE_MOVABLE, set zone_last to ZONE_MOVABLE. | |
d9713679 | 717 | */ |
6715ddf9 | 718 | if (N_MEMORY == N_NORMAL_MEMORY) |
d9713679 LJ |
719 | zone_last = ZONE_MOVABLE; |
720 | ||
721 | /* | |
722 | * if the memory to be online is in a zone of 0...zone_last, and | |
723 | * the zones of 0...zone_last don't have memory before online, we will | |
724 | * need to set the node to node_states[N_NORMAL_MEMORY] after | |
725 | * the memory is online. | |
726 | */ | |
727 | if (zone_idx(zone) <= zone_last && !node_state(nid, N_NORMAL_MEMORY)) | |
728 | arg->status_change_nid_normal = nid; | |
729 | else | |
730 | arg->status_change_nid_normal = -1; | |
731 | ||
6715ddf9 LJ |
732 | #ifdef CONFIG_HIGHMEM |
733 | /* | |
734 | * If we have movable node, node_states[N_HIGH_MEMORY] | |
735 | * contains nodes which have zones of 0...ZONE_HIGHMEM, | |
736 | * set zone_last to ZONE_HIGHMEM. | |
737 | * | |
738 | * If we don't have movable node, node_states[N_NORMAL_MEMORY] | |
739 | * contains nodes which have zones of 0...ZONE_MOVABLE, | |
740 | * set zone_last to ZONE_MOVABLE. | |
741 | */ | |
742 | zone_last = ZONE_HIGHMEM; | |
743 | if (N_MEMORY == N_HIGH_MEMORY) | |
744 | zone_last = ZONE_MOVABLE; | |
745 | ||
746 | if (zone_idx(zone) <= zone_last && !node_state(nid, N_HIGH_MEMORY)) | |
747 | arg->status_change_nid_high = nid; | |
748 | else | |
749 | arg->status_change_nid_high = -1; | |
750 | #else | |
751 | arg->status_change_nid_high = arg->status_change_nid_normal; | |
752 | #endif | |
753 | ||
d9713679 LJ |
754 | /* |
755 | * if the node don't have memory befor online, we will need to | |
6715ddf9 | 756 | * set the node to node_states[N_MEMORY] after the memory |
d9713679 LJ |
757 | * is online. |
758 | */ | |
6715ddf9 | 759 | if (!node_state(nid, N_MEMORY)) |
d9713679 LJ |
760 | arg->status_change_nid = nid; |
761 | else | |
762 | arg->status_change_nid = -1; | |
763 | } | |
764 | ||
765 | static void node_states_set_node(int node, struct memory_notify *arg) | |
766 | { | |
767 | if (arg->status_change_nid_normal >= 0) | |
768 | node_set_state(node, N_NORMAL_MEMORY); | |
769 | ||
6715ddf9 LJ |
770 | if (arg->status_change_nid_high >= 0) |
771 | node_set_state(node, N_HIGH_MEMORY); | |
772 | ||
773 | node_set_state(node, N_MEMORY); | |
d9713679 LJ |
774 | } |
775 | ||
f1dd2cd1 MH |
776 | static void __meminit resize_zone_range(struct zone *zone, unsigned long start_pfn, |
777 | unsigned long nr_pages) | |
778 | { | |
779 | unsigned long old_end_pfn = zone_end_pfn(zone); | |
780 | ||
781 | if (zone_is_empty(zone) || start_pfn < zone->zone_start_pfn) | |
782 | zone->zone_start_pfn = start_pfn; | |
783 | ||
784 | zone->spanned_pages = max(start_pfn + nr_pages, old_end_pfn) - zone->zone_start_pfn; | |
785 | } | |
786 | ||
787 | static void __meminit resize_pgdat_range(struct pglist_data *pgdat, unsigned long start_pfn, | |
788 | unsigned long nr_pages) | |
789 | { | |
790 | unsigned long old_end_pfn = pgdat_end_pfn(pgdat); | |
791 | ||
792 | if (!pgdat->node_spanned_pages || start_pfn < pgdat->node_start_pfn) | |
793 | pgdat->node_start_pfn = start_pfn; | |
794 | ||
795 | pgdat->node_spanned_pages = max(start_pfn + nr_pages, old_end_pfn) - pgdat->node_start_pfn; | |
796 | } | |
797 | ||
a99583e7 CH |
798 | void __ref move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn, |
799 | unsigned long nr_pages, struct vmem_altmap *altmap) | |
f1dd2cd1 MH |
800 | { |
801 | struct pglist_data *pgdat = zone->zone_pgdat; | |
802 | int nid = pgdat->node_id; | |
803 | unsigned long flags; | |
df429ac0 | 804 | |
f1dd2cd1 MH |
805 | if (zone_is_empty(zone)) |
806 | init_currently_empty_zone(zone, start_pfn, nr_pages); | |
df429ac0 | 807 | |
f1dd2cd1 MH |
808 | clear_zone_contiguous(zone); |
809 | ||
810 | /* TODO Huh pgdat is irqsave while zone is not. It used to be like that before */ | |
811 | pgdat_resize_lock(pgdat, &flags); | |
812 | zone_span_writelock(zone); | |
813 | resize_zone_range(zone, start_pfn, nr_pages); | |
814 | zone_span_writeunlock(zone); | |
815 | resize_pgdat_range(pgdat, start_pfn, nr_pages); | |
816 | pgdat_resize_unlock(pgdat, &flags); | |
817 | ||
818 | /* | |
819 | * TODO now we have a visible range of pages which are not associated | |
820 | * with their zone properly. Not nice but set_pfnblock_flags_mask | |
821 | * expects the zone spans the pfn range. All the pages in the range | |
822 | * are reserved so nobody should be touching them so we should be safe | |
823 | */ | |
a99583e7 CH |
824 | memmap_init_zone(nr_pages, nid, zone_idx(zone), start_pfn, |
825 | MEMMAP_HOTPLUG, altmap); | |
f1dd2cd1 MH |
826 | |
827 | set_zone_contiguous(zone); | |
828 | } | |
829 | ||
c246a213 MH |
830 | /* |
831 | * Returns a default kernel memory zone for the given pfn range. | |
832 | * If no kernel zone covers this pfn range it will automatically go | |
833 | * to the ZONE_NORMAL. | |
834 | */ | |
c6f03e29 | 835 | static struct zone *default_kernel_zone_for_pfn(int nid, unsigned long start_pfn, |
c246a213 MH |
836 | unsigned long nr_pages) |
837 | { | |
838 | struct pglist_data *pgdat = NODE_DATA(nid); | |
839 | int zid; | |
840 | ||
841 | for (zid = 0; zid <= ZONE_NORMAL; zid++) { | |
842 | struct zone *zone = &pgdat->node_zones[zid]; | |
843 | ||
844 | if (zone_intersects(zone, start_pfn, nr_pages)) | |
845 | return zone; | |
846 | } | |
847 | ||
848 | return &pgdat->node_zones[ZONE_NORMAL]; | |
849 | } | |
850 | ||
c6f03e29 MH |
851 | static inline struct zone *default_zone_for_pfn(int nid, unsigned long start_pfn, |
852 | unsigned long nr_pages) | |
e5e68930 | 853 | { |
c6f03e29 MH |
854 | struct zone *kernel_zone = default_kernel_zone_for_pfn(nid, start_pfn, |
855 | nr_pages); | |
856 | struct zone *movable_zone = &NODE_DATA(nid)->node_zones[ZONE_MOVABLE]; | |
857 | bool in_kernel = zone_intersects(kernel_zone, start_pfn, nr_pages); | |
858 | bool in_movable = zone_intersects(movable_zone, start_pfn, nr_pages); | |
e5e68930 MH |
859 | |
860 | /* | |
c6f03e29 MH |
861 | * We inherit the existing zone in a simple case where zones do not |
862 | * overlap in the given range | |
e5e68930 | 863 | */ |
c6f03e29 MH |
864 | if (in_kernel ^ in_movable) |
865 | return (in_kernel) ? kernel_zone : movable_zone; | |
9f123ab5 | 866 | |
c6f03e29 MH |
867 | /* |
868 | * If the range doesn't belong to any zone or two zones overlap in the | |
869 | * given range then we use movable zone only if movable_node is | |
870 | * enabled because we always online to a kernel zone by default. | |
871 | */ | |
872 | return movable_node_enabled ? movable_zone : kernel_zone; | |
9f123ab5 MH |
873 | } |
874 | ||
e5e68930 MH |
875 | struct zone * zone_for_pfn_range(int online_type, int nid, unsigned start_pfn, |
876 | unsigned long nr_pages) | |
f1dd2cd1 | 877 | { |
c6f03e29 MH |
878 | if (online_type == MMOP_ONLINE_KERNEL) |
879 | return default_kernel_zone_for_pfn(nid, start_pfn, nr_pages); | |
f1dd2cd1 | 880 | |
c6f03e29 MH |
881 | if (online_type == MMOP_ONLINE_MOVABLE) |
882 | return &NODE_DATA(nid)->node_zones[ZONE_MOVABLE]; | |
df429ac0 | 883 | |
c6f03e29 | 884 | return default_zone_for_pfn(nid, start_pfn, nr_pages); |
e5e68930 MH |
885 | } |
886 | ||
887 | /* | |
888 | * Associates the given pfn range with the given node and the zone appropriate | |
889 | * for the given online type. | |
890 | */ | |
891 | static struct zone * __meminit move_pfn_range(int online_type, int nid, | |
892 | unsigned long start_pfn, unsigned long nr_pages) | |
893 | { | |
894 | struct zone *zone; | |
895 | ||
896 | zone = zone_for_pfn_range(online_type, nid, start_pfn, nr_pages); | |
a99583e7 | 897 | move_pfn_range_to_zone(zone, start_pfn, nr_pages, NULL); |
f1dd2cd1 | 898 | return zone; |
df429ac0 | 899 | } |
75884fb1 | 900 | |
b93e0f32 | 901 | /* Must be protected by mem_hotplug_begin() or a device_lock */ |
511c2aba | 902 | int __ref online_pages(unsigned long pfn, unsigned long nr_pages, int online_type) |
75884fb1 | 903 | { |
aa47228a | 904 | unsigned long flags; |
3947be19 DH |
905 | unsigned long onlined_pages = 0; |
906 | struct zone *zone; | |
6811378e | 907 | int need_zonelists_rebuild = 0; |
7b78d335 YG |
908 | int nid; |
909 | int ret; | |
910 | struct memory_notify arg; | |
911 | ||
f1dd2cd1 | 912 | nid = pfn_to_nid(pfn); |
f1dd2cd1 MH |
913 | /* associate pfn range with the zone */ |
914 | zone = move_pfn_range(online_type, nid, pfn, nr_pages); | |
915 | ||
7b78d335 YG |
916 | arg.start_pfn = pfn; |
917 | arg.nr_pages = nr_pages; | |
d9713679 | 918 | node_states_check_changes_online(nr_pages, zone, &arg); |
7b78d335 | 919 | |
7b78d335 YG |
920 | ret = memory_notify(MEM_GOING_ONLINE, &arg); |
921 | ret = notifier_to_errno(ret); | |
e33e33b4 CY |
922 | if (ret) |
923 | goto failed_addition; | |
924 | ||
6811378e YG |
925 | /* |
926 | * If this zone is not populated, then it is not in zonelist. | |
927 | * This means the page allocator ignores this zone. | |
928 | * So, zonelist must be updated after online. | |
929 | */ | |
6dcd73d7 | 930 | if (!populated_zone(zone)) { |
6811378e | 931 | need_zonelists_rebuild = 1; |
72675e13 | 932 | setup_zone_pageset(zone); |
6dcd73d7 | 933 | } |
6811378e | 934 | |
908eedc6 | 935 | ret = walk_system_ram_range(pfn, nr_pages, &onlined_pages, |
75884fb1 | 936 | online_pages_range); |
fd8a4221 | 937 | if (ret) { |
6dcd73d7 WC |
938 | if (need_zonelists_rebuild) |
939 | zone_pcp_reset(zone); | |
e33e33b4 | 940 | goto failed_addition; |
fd8a4221 GL |
941 | } |
942 | ||
3947be19 | 943 | zone->present_pages += onlined_pages; |
aa47228a CS |
944 | |
945 | pgdat_resize_lock(zone->zone_pgdat, &flags); | |
f2937be5 | 946 | zone->zone_pgdat->node_present_pages += onlined_pages; |
aa47228a CS |
947 | pgdat_resize_unlock(zone->zone_pgdat, &flags); |
948 | ||
08dff7b7 | 949 | if (onlined_pages) { |
e888ca35 | 950 | node_states_set_node(nid, &arg); |
08dff7b7 | 951 | if (need_zonelists_rebuild) |
72675e13 | 952 | build_all_zonelists(NULL); |
08dff7b7 JL |
953 | else |
954 | zone_pcp_update(zone); | |
955 | } | |
3947be19 | 956 | |
1b79acc9 KM |
957 | init_per_zone_wmark_min(); |
958 | ||
698b1b30 | 959 | if (onlined_pages) { |
e888ca35 | 960 | kswapd_run(nid); |
698b1b30 VB |
961 | kcompactd_run(nid); |
962 | } | |
61b13993 | 963 | |
1f522509 | 964 | vm_total_pages = nr_free_pagecache_pages(); |
2f7f24ec | 965 | |
2d1d43f6 | 966 | writeback_set_ratelimit(); |
7b78d335 YG |
967 | |
968 | if (onlined_pages) | |
969 | memory_notify(MEM_ONLINE, &arg); | |
30467e0b | 970 | return 0; |
e33e33b4 CY |
971 | |
972 | failed_addition: | |
973 | pr_debug("online_pages [mem %#010llx-%#010llx] failed\n", | |
974 | (unsigned long long) pfn << PAGE_SHIFT, | |
975 | (((unsigned long long) pfn + nr_pages) << PAGE_SHIFT) - 1); | |
976 | memory_notify(MEM_CANCEL_ONLINE, &arg); | |
977 | return ret; | |
3947be19 | 978 | } |
53947027 | 979 | #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ |
bc02af93 | 980 | |
0bd85420 TC |
981 | static void reset_node_present_pages(pg_data_t *pgdat) |
982 | { | |
983 | struct zone *z; | |
984 | ||
985 | for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++) | |
986 | z->present_pages = 0; | |
987 | ||
988 | pgdat->node_present_pages = 0; | |
989 | } | |
990 | ||
e1319331 HS |
991 | /* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */ |
992 | static pg_data_t __ref *hotadd_new_pgdat(int nid, u64 start) | |
9af3c2de YG |
993 | { |
994 | struct pglist_data *pgdat; | |
995 | unsigned long zones_size[MAX_NR_ZONES] = {0}; | |
996 | unsigned long zholes_size[MAX_NR_ZONES] = {0}; | |
c8e861a5 | 997 | unsigned long start_pfn = PFN_DOWN(start); |
9af3c2de | 998 | |
a1e565aa TC |
999 | pgdat = NODE_DATA(nid); |
1000 | if (!pgdat) { | |
1001 | pgdat = arch_alloc_nodedata(nid); | |
1002 | if (!pgdat) | |
1003 | return NULL; | |
9af3c2de | 1004 | |
a1e565aa | 1005 | arch_refresh_nodedata(nid, pgdat); |
b0dc3a34 | 1006 | } else { |
e716f2eb MG |
1007 | /* |
1008 | * Reset the nr_zones, order and classzone_idx before reuse. | |
1009 | * Note that kswapd will init kswapd_classzone_idx properly | |
1010 | * when it starts in the near future. | |
1011 | */ | |
b0dc3a34 | 1012 | pgdat->nr_zones = 0; |
38087d9b MG |
1013 | pgdat->kswapd_order = 0; |
1014 | pgdat->kswapd_classzone_idx = 0; | |
a1e565aa | 1015 | } |
9af3c2de YG |
1016 | |
1017 | /* we can use NODE_DATA(nid) from here */ | |
1018 | ||
1019 | /* init node's zones as empty zones, we don't have any present pages.*/ | |
9109fb7b | 1020 | free_area_init_node(nid, zones_size, start_pfn, zholes_size); |
5830169f | 1021 | pgdat->per_cpu_nodestats = alloc_percpu(struct per_cpu_nodestat); |
9af3c2de | 1022 | |
959ecc48 KH |
1023 | /* |
1024 | * The node we allocated has no zone fallback lists. For avoiding | |
1025 | * to access not-initialized zonelist, build here. | |
1026 | */ | |
72675e13 | 1027 | build_all_zonelists(pgdat); |
959ecc48 | 1028 | |
f784a3f1 TC |
1029 | /* |
1030 | * zone->managed_pages is set to an approximate value in | |
1031 | * free_area_init_core(), which will cause | |
1032 | * /sys/device/system/node/nodeX/meminfo has wrong data. | |
1033 | * So reset it to 0 before any memory is onlined. | |
1034 | */ | |
1035 | reset_node_managed_pages(pgdat); | |
1036 | ||
0bd85420 TC |
1037 | /* |
1038 | * When memory is hot-added, all the memory is in offline state. So | |
1039 | * clear all zones' present_pages because they will be updated in | |
1040 | * online_pages() and offline_pages(). | |
1041 | */ | |
1042 | reset_node_present_pages(pgdat); | |
1043 | ||
9af3c2de YG |
1044 | return pgdat; |
1045 | } | |
1046 | ||
1047 | static void rollback_node_hotadd(int nid, pg_data_t *pgdat) | |
1048 | { | |
1049 | arch_refresh_nodedata(nid, NULL); | |
5830169f | 1050 | free_percpu(pgdat->per_cpu_nodestats); |
9af3c2de YG |
1051 | arch_free_nodedata(pgdat); |
1052 | return; | |
1053 | } | |
1054 | ||
0a547039 | 1055 | |
01b0f197 TK |
1056 | /** |
1057 | * try_online_node - online a node if offlined | |
1058 | * | |
cf23422b | 1059 | * called by cpu_up() to online a node without onlined memory. |
1060 | */ | |
01b0f197 | 1061 | int try_online_node(int nid) |
cf23422b | 1062 | { |
1063 | pg_data_t *pgdat; | |
1064 | int ret; | |
1065 | ||
01b0f197 TK |
1066 | if (node_online(nid)) |
1067 | return 0; | |
1068 | ||
bfc8c901 | 1069 | mem_hotplug_begin(); |
cf23422b | 1070 | pgdat = hotadd_new_pgdat(nid, 0); |
7553e8f2 | 1071 | if (!pgdat) { |
01b0f197 | 1072 | pr_err("Cannot online node %d due to NULL pgdat\n", nid); |
cf23422b | 1073 | ret = -ENOMEM; |
1074 | goto out; | |
1075 | } | |
1076 | node_set_online(nid); | |
1077 | ret = register_one_node(nid); | |
1078 | BUG_ON(ret); | |
cf23422b | 1079 | out: |
bfc8c901 | 1080 | mem_hotplug_done(); |
cf23422b | 1081 | return ret; |
1082 | } | |
1083 | ||
27356f54 TK |
1084 | static int check_hotplug_memory_range(u64 start, u64 size) |
1085 | { | |
c8e861a5 | 1086 | u64 start_pfn = PFN_DOWN(start); |
27356f54 TK |
1087 | u64 nr_pages = size >> PAGE_SHIFT; |
1088 | ||
1089 | /* Memory range must be aligned with section */ | |
1090 | if ((start_pfn & ~PAGE_SECTION_MASK) || | |
1091 | (nr_pages % PAGES_PER_SECTION) || (!nr_pages)) { | |
1092 | pr_err("Section-unaligned hotplug range: start 0x%llx, size 0x%llx\n", | |
1093 | (unsigned long long)start, | |
1094 | (unsigned long long)size); | |
1095 | return -EINVAL; | |
1096 | } | |
1097 | ||
1098 | return 0; | |
1099 | } | |
1100 | ||
31bc3858 VK |
1101 | static int online_memory_block(struct memory_block *mem, void *arg) |
1102 | { | |
dc18d706 | 1103 | return device_online(&mem->dev); |
31bc3858 VK |
1104 | } |
1105 | ||
31168481 | 1106 | /* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */ |
31bc3858 | 1107 | int __ref add_memory_resource(int nid, struct resource *res, bool online) |
bc02af93 | 1108 | { |
62cedb9f | 1109 | u64 start, size; |
9af3c2de | 1110 | pg_data_t *pgdat = NULL; |
a1e565aa TC |
1111 | bool new_pgdat; |
1112 | bool new_node; | |
bc02af93 YG |
1113 | int ret; |
1114 | ||
62cedb9f DV |
1115 | start = res->start; |
1116 | size = resource_size(res); | |
1117 | ||
27356f54 TK |
1118 | ret = check_hotplug_memory_range(start, size); |
1119 | if (ret) | |
1120 | return ret; | |
1121 | ||
a1e565aa TC |
1122 | { /* Stupid hack to suppress address-never-null warning */ |
1123 | void *p = NODE_DATA(nid); | |
1124 | new_pgdat = !p; | |
1125 | } | |
ac13c462 | 1126 | |
bfc8c901 | 1127 | mem_hotplug_begin(); |
ac13c462 | 1128 | |
7f36e3e5 TC |
1129 | /* |
1130 | * Add new range to memblock so that when hotadd_new_pgdat() is called | |
1131 | * to allocate new pgdat, get_pfn_range_for_nid() will be able to find | |
1132 | * this new range and calculate total pages correctly. The range will | |
1133 | * be removed at hot-remove time. | |
1134 | */ | |
1135 | memblock_add_node(start, size, nid); | |
1136 | ||
a1e565aa TC |
1137 | new_node = !node_online(nid); |
1138 | if (new_node) { | |
9af3c2de | 1139 | pgdat = hotadd_new_pgdat(nid, start); |
6ad696d2 | 1140 | ret = -ENOMEM; |
9af3c2de | 1141 | if (!pgdat) |
41b9e2d7 | 1142 | goto error; |
9af3c2de YG |
1143 | } |
1144 | ||
bc02af93 | 1145 | /* call arch's memory hotadd */ |
24e6d5a5 | 1146 | ret = arch_add_memory(nid, start, size, NULL, true); |
bc02af93 | 1147 | |
9af3c2de YG |
1148 | if (ret < 0) |
1149 | goto error; | |
1150 | ||
0fc44159 | 1151 | /* we online node here. we can't roll back from here. */ |
9af3c2de YG |
1152 | node_set_online(nid); |
1153 | ||
a1e565aa | 1154 | if (new_node) { |
9037a993 MH |
1155 | unsigned long start_pfn = start >> PAGE_SHIFT; |
1156 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
1157 | ||
1158 | ret = __register_one_node(nid); | |
1159 | if (ret) | |
1160 | goto register_fail; | |
1161 | ||
1162 | /* | |
1163 | * link memory sections under this node. This is already | |
1164 | * done when creatig memory section in register_new_memory | |
1165 | * but that depends to have the node registered so offline | |
1166 | * nodes have to go through register_node. | |
1167 | * TODO clean up this mess. | |
1168 | */ | |
1169 | ret = link_mem_sections(nid, start_pfn, nr_pages); | |
1170 | register_fail: | |
0fc44159 YG |
1171 | /* |
1172 | * If sysfs file of new node can't create, cpu on the node | |
1173 | * can't be hot-added. There is no rollback way now. | |
1174 | * So, check by BUG_ON() to catch it reluctantly.. | |
1175 | */ | |
1176 | BUG_ON(ret); | |
1177 | } | |
1178 | ||
d96ae530 | 1179 | /* create new memmap entry */ |
1180 | firmware_map_add_hotplug(start, start + size, "System RAM"); | |
1181 | ||
31bc3858 VK |
1182 | /* online pages if requested */ |
1183 | if (online) | |
1184 | walk_memory_range(PFN_DOWN(start), PFN_UP(start + size - 1), | |
1185 | NULL, online_memory_block); | |
1186 | ||
6ad696d2 AK |
1187 | goto out; |
1188 | ||
9af3c2de YG |
1189 | error: |
1190 | /* rollback pgdat allocation and others */ | |
dbac61a3 | 1191 | if (new_pgdat && pgdat) |
9af3c2de | 1192 | rollback_node_hotadd(nid, pgdat); |
7f36e3e5 | 1193 | memblock_remove(start, size); |
9af3c2de | 1194 | |
6ad696d2 | 1195 | out: |
bfc8c901 | 1196 | mem_hotplug_done(); |
bc02af93 YG |
1197 | return ret; |
1198 | } | |
62cedb9f DV |
1199 | EXPORT_SYMBOL_GPL(add_memory_resource); |
1200 | ||
1201 | int __ref add_memory(int nid, u64 start, u64 size) | |
1202 | { | |
1203 | struct resource *res; | |
1204 | int ret; | |
1205 | ||
1206 | res = register_memory_resource(start, size); | |
6f754ba4 VK |
1207 | if (IS_ERR(res)) |
1208 | return PTR_ERR(res); | |
62cedb9f | 1209 | |
31bc3858 | 1210 | ret = add_memory_resource(nid, res, memhp_auto_online); |
62cedb9f DV |
1211 | if (ret < 0) |
1212 | release_memory_resource(res); | |
1213 | return ret; | |
1214 | } | |
bc02af93 | 1215 | EXPORT_SYMBOL_GPL(add_memory); |
0c0e6195 KH |
1216 | |
1217 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
5c755e9f BP |
1218 | /* |
1219 | * A free page on the buddy free lists (not the per-cpu lists) has PageBuddy | |
1220 | * set and the size of the free page is given by page_order(). Using this, | |
1221 | * the function determines if the pageblock contains only free pages. | |
1222 | * Due to buddy contraints, a free page at least the size of a pageblock will | |
1223 | * be located at the start of the pageblock | |
1224 | */ | |
1225 | static inline int pageblock_free(struct page *page) | |
1226 | { | |
1227 | return PageBuddy(page) && page_order(page) >= pageblock_order; | |
1228 | } | |
1229 | ||
1230 | /* Return the start of the next active pageblock after a given page */ | |
1231 | static struct page *next_active_pageblock(struct page *page) | |
1232 | { | |
5c755e9f BP |
1233 | /* Ensure the starting page is pageblock-aligned */ |
1234 | BUG_ON(page_to_pfn(page) & (pageblock_nr_pages - 1)); | |
1235 | ||
5c755e9f | 1236 | /* If the entire pageblock is free, move to the end of free page */ |
0dcc48c1 KH |
1237 | if (pageblock_free(page)) { |
1238 | int order; | |
1239 | /* be careful. we don't have locks, page_order can be changed.*/ | |
1240 | order = page_order(page); | |
1241 | if ((order < MAX_ORDER) && (order >= pageblock_order)) | |
1242 | return page + (1 << order); | |
1243 | } | |
5c755e9f | 1244 | |
0dcc48c1 | 1245 | return page + pageblock_nr_pages; |
5c755e9f BP |
1246 | } |
1247 | ||
1248 | /* Checks if this range of memory is likely to be hot-removable. */ | |
c98940f6 | 1249 | bool is_mem_section_removable(unsigned long start_pfn, unsigned long nr_pages) |
5c755e9f | 1250 | { |
5c755e9f BP |
1251 | struct page *page = pfn_to_page(start_pfn); |
1252 | struct page *end_page = page + nr_pages; | |
1253 | ||
1254 | /* Check the starting page of each pageblock within the range */ | |
1255 | for (; page < end_page; page = next_active_pageblock(page)) { | |
49ac8255 | 1256 | if (!is_pageblock_removable_nolock(page)) |
c98940f6 | 1257 | return false; |
49ac8255 | 1258 | cond_resched(); |
5c755e9f BP |
1259 | } |
1260 | ||
1261 | /* All pageblocks in the memory block are likely to be hot-removable */ | |
c98940f6 | 1262 | return true; |
5c755e9f BP |
1263 | } |
1264 | ||
0c0e6195 | 1265 | /* |
deb88a2a | 1266 | * Confirm all pages in a range [start, end) belong to the same zone. |
a96dfddb | 1267 | * When true, return its valid [start, end). |
0c0e6195 | 1268 | */ |
a96dfddb TK |
1269 | int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn, |
1270 | unsigned long *valid_start, unsigned long *valid_end) | |
0c0e6195 | 1271 | { |
5f0f2887 | 1272 | unsigned long pfn, sec_end_pfn; |
a96dfddb | 1273 | unsigned long start, end; |
0c0e6195 KH |
1274 | struct zone *zone = NULL; |
1275 | struct page *page; | |
1276 | int i; | |
deb88a2a | 1277 | for (pfn = start_pfn, sec_end_pfn = SECTION_ALIGN_UP(start_pfn + 1); |
0c0e6195 | 1278 | pfn < end_pfn; |
deb88a2a | 1279 | pfn = sec_end_pfn, sec_end_pfn += PAGES_PER_SECTION) { |
5f0f2887 AB |
1280 | /* Make sure the memory section is present first */ |
1281 | if (!present_section_nr(pfn_to_section_nr(pfn))) | |
0c0e6195 | 1282 | continue; |
5f0f2887 AB |
1283 | for (; pfn < sec_end_pfn && pfn < end_pfn; |
1284 | pfn += MAX_ORDER_NR_PAGES) { | |
1285 | i = 0; | |
1286 | /* This is just a CONFIG_HOLES_IN_ZONE check.*/ | |
1287 | while ((i < MAX_ORDER_NR_PAGES) && | |
1288 | !pfn_valid_within(pfn + i)) | |
1289 | i++; | |
d6d8c8a4 | 1290 | if (i == MAX_ORDER_NR_PAGES || pfn + i >= end_pfn) |
5f0f2887 AB |
1291 | continue; |
1292 | page = pfn_to_page(pfn + i); | |
1293 | if (zone && page_zone(page) != zone) | |
1294 | return 0; | |
a96dfddb TK |
1295 | if (!zone) |
1296 | start = pfn + i; | |
5f0f2887 | 1297 | zone = page_zone(page); |
a96dfddb | 1298 | end = pfn + MAX_ORDER_NR_PAGES; |
5f0f2887 | 1299 | } |
0c0e6195 | 1300 | } |
deb88a2a | 1301 | |
a96dfddb TK |
1302 | if (zone) { |
1303 | *valid_start = start; | |
d6d8c8a4 | 1304 | *valid_end = min(end, end_pfn); |
deb88a2a | 1305 | return 1; |
a96dfddb | 1306 | } else { |
deb88a2a | 1307 | return 0; |
a96dfddb | 1308 | } |
0c0e6195 KH |
1309 | } |
1310 | ||
1311 | /* | |
0efadf48 YX |
1312 | * Scan pfn range [start,end) to find movable/migratable pages (LRU pages, |
1313 | * non-lru movable pages and hugepages). We scan pfn because it's much | |
1314 | * easier than scanning over linked list. This function returns the pfn | |
1315 | * of the first found movable page if it's found, otherwise 0. | |
0c0e6195 | 1316 | */ |
c8721bbb | 1317 | static unsigned long scan_movable_pages(unsigned long start, unsigned long end) |
0c0e6195 KH |
1318 | { |
1319 | unsigned long pfn; | |
1320 | struct page *page; | |
1321 | for (pfn = start; pfn < end; pfn++) { | |
1322 | if (pfn_valid(pfn)) { | |
1323 | page = pfn_to_page(pfn); | |
1324 | if (PageLRU(page)) | |
1325 | return pfn; | |
0efadf48 YX |
1326 | if (__PageMovable(page)) |
1327 | return pfn; | |
c8721bbb | 1328 | if (PageHuge(page)) { |
7e1f049e | 1329 | if (page_huge_active(page)) |
c8721bbb NH |
1330 | return pfn; |
1331 | else | |
1332 | pfn = round_up(pfn + 1, | |
1333 | 1 << compound_order(page)) - 1; | |
1334 | } | |
0c0e6195 KH |
1335 | } |
1336 | } | |
1337 | return 0; | |
1338 | } | |
1339 | ||
394e31d2 XQ |
1340 | static struct page *new_node_page(struct page *page, unsigned long private, |
1341 | int **result) | |
1342 | { | |
394e31d2 | 1343 | int nid = page_to_nid(page); |
231e97e2 | 1344 | nodemask_t nmask = node_states[N_MEMORY]; |
7f252f27 MH |
1345 | |
1346 | /* | |
1347 | * try to allocate from a different node but reuse this node if there | |
1348 | * are no other online nodes to be used (e.g. we are offlining a part | |
1349 | * of the only existing node) | |
1350 | */ | |
1351 | node_clear(nid, nmask); | |
1352 | if (nodes_empty(nmask)) | |
1353 | node_set(nid, nmask); | |
394e31d2 | 1354 | |
8b913238 | 1355 | return new_page_nodemask(page, nid, &nmask); |
394e31d2 XQ |
1356 | } |
1357 | ||
0c0e6195 KH |
1358 | #define NR_OFFLINE_AT_ONCE_PAGES (256) |
1359 | static int | |
1360 | do_migrate_range(unsigned long start_pfn, unsigned long end_pfn) | |
1361 | { | |
1362 | unsigned long pfn; | |
1363 | struct page *page; | |
1364 | int move_pages = NR_OFFLINE_AT_ONCE_PAGES; | |
1365 | int not_managed = 0; | |
1366 | int ret = 0; | |
1367 | LIST_HEAD(source); | |
1368 | ||
1369 | for (pfn = start_pfn; pfn < end_pfn && move_pages > 0; pfn++) { | |
1370 | if (!pfn_valid(pfn)) | |
1371 | continue; | |
1372 | page = pfn_to_page(pfn); | |
c8721bbb NH |
1373 | |
1374 | if (PageHuge(page)) { | |
1375 | struct page *head = compound_head(page); | |
1376 | pfn = page_to_pfn(head) + (1<<compound_order(head)) - 1; | |
1377 | if (compound_order(head) > PFN_SECTION_SHIFT) { | |
1378 | ret = -EBUSY; | |
1379 | break; | |
1380 | } | |
1381 | if (isolate_huge_page(page, &source)) | |
1382 | move_pages -= 1 << compound_order(head); | |
1383 | continue; | |
8135d892 NH |
1384 | } else if (thp_migration_supported() && PageTransHuge(page)) |
1385 | pfn = page_to_pfn(compound_head(page)) | |
1386 | + hpage_nr_pages(page) - 1; | |
c8721bbb | 1387 | |
700c2a46 | 1388 | if (!get_page_unless_zero(page)) |
0c0e6195 KH |
1389 | continue; |
1390 | /* | |
0efadf48 YX |
1391 | * We can skip free pages. And we can deal with pages on |
1392 | * LRU and non-lru movable pages. | |
0c0e6195 | 1393 | */ |
0efadf48 YX |
1394 | if (PageLRU(page)) |
1395 | ret = isolate_lru_page(page); | |
1396 | else | |
1397 | ret = isolate_movable_page(page, ISOLATE_UNEVICTABLE); | |
0c0e6195 | 1398 | if (!ret) { /* Success */ |
700c2a46 | 1399 | put_page(page); |
62695a84 | 1400 | list_add_tail(&page->lru, &source); |
0c0e6195 | 1401 | move_pages--; |
0efadf48 YX |
1402 | if (!__PageMovable(page)) |
1403 | inc_node_page_state(page, NR_ISOLATED_ANON + | |
1404 | page_is_file_cache(page)); | |
6d9c285a | 1405 | |
0c0e6195 | 1406 | } else { |
0c0e6195 | 1407 | #ifdef CONFIG_DEBUG_VM |
0efadf48 YX |
1408 | pr_alert("failed to isolate pfn %lx\n", pfn); |
1409 | dump_page(page, "isolation failed"); | |
0c0e6195 | 1410 | #endif |
700c2a46 | 1411 | put_page(page); |
25985edc | 1412 | /* Because we don't have big zone->lock. we should |
809c4449 BL |
1413 | check this again here. */ |
1414 | if (page_count(page)) { | |
1415 | not_managed++; | |
f3ab2636 | 1416 | ret = -EBUSY; |
809c4449 BL |
1417 | break; |
1418 | } | |
0c0e6195 KH |
1419 | } |
1420 | } | |
f3ab2636 BL |
1421 | if (!list_empty(&source)) { |
1422 | if (not_managed) { | |
c8721bbb | 1423 | putback_movable_pages(&source); |
f3ab2636 BL |
1424 | goto out; |
1425 | } | |
74c08f98 | 1426 | |
394e31d2 XQ |
1427 | /* Allocate a new page from the nearest neighbor node */ |
1428 | ret = migrate_pages(&source, new_node_page, NULL, 0, | |
9c620e2b | 1429 | MIGRATE_SYNC, MR_MEMORY_HOTPLUG); |
f3ab2636 | 1430 | if (ret) |
c8721bbb | 1431 | putback_movable_pages(&source); |
0c0e6195 | 1432 | } |
0c0e6195 KH |
1433 | out: |
1434 | return ret; | |
1435 | } | |
1436 | ||
1437 | /* | |
1438 | * remove from free_area[] and mark all as Reserved. | |
1439 | */ | |
1440 | static int | |
1441 | offline_isolated_pages_cb(unsigned long start, unsigned long nr_pages, | |
1442 | void *data) | |
1443 | { | |
1444 | __offline_isolated_pages(start, start + nr_pages); | |
1445 | return 0; | |
1446 | } | |
1447 | ||
1448 | static void | |
1449 | offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn) | |
1450 | { | |
908eedc6 | 1451 | walk_system_ram_range(start_pfn, end_pfn - start_pfn, NULL, |
0c0e6195 KH |
1452 | offline_isolated_pages_cb); |
1453 | } | |
1454 | ||
1455 | /* | |
1456 | * Check all pages in range, recoreded as memory resource, are isolated. | |
1457 | */ | |
1458 | static int | |
1459 | check_pages_isolated_cb(unsigned long start_pfn, unsigned long nr_pages, | |
1460 | void *data) | |
1461 | { | |
1462 | int ret; | |
1463 | long offlined = *(long *)data; | |
b023f468 | 1464 | ret = test_pages_isolated(start_pfn, start_pfn + nr_pages, true); |
0c0e6195 KH |
1465 | offlined = nr_pages; |
1466 | if (!ret) | |
1467 | *(long *)data += offlined; | |
1468 | return ret; | |
1469 | } | |
1470 | ||
1471 | static long | |
1472 | check_pages_isolated(unsigned long start_pfn, unsigned long end_pfn) | |
1473 | { | |
1474 | long offlined = 0; | |
1475 | int ret; | |
1476 | ||
908eedc6 | 1477 | ret = walk_system_ram_range(start_pfn, end_pfn - start_pfn, &offlined, |
0c0e6195 KH |
1478 | check_pages_isolated_cb); |
1479 | if (ret < 0) | |
1480 | offlined = (long)ret; | |
1481 | return offlined; | |
1482 | } | |
1483 | ||
c5320926 TC |
1484 | static int __init cmdline_parse_movable_node(char *p) |
1485 | { | |
4932381e | 1486 | #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP |
55ac590c | 1487 | movable_node_enabled = true; |
4932381e MH |
1488 | #else |
1489 | pr_warn("movable_node parameter depends on CONFIG_HAVE_MEMBLOCK_NODE_MAP to work properly\n"); | |
1490 | #endif | |
c5320926 TC |
1491 | return 0; |
1492 | } | |
1493 | early_param("movable_node", cmdline_parse_movable_node); | |
1494 | ||
d9713679 LJ |
1495 | /* check which state of node_states will be changed when offline memory */ |
1496 | static void node_states_check_changes_offline(unsigned long nr_pages, | |
1497 | struct zone *zone, struct memory_notify *arg) | |
1498 | { | |
1499 | struct pglist_data *pgdat = zone->zone_pgdat; | |
1500 | unsigned long present_pages = 0; | |
1501 | enum zone_type zt, zone_last = ZONE_NORMAL; | |
1502 | ||
1503 | /* | |
6715ddf9 LJ |
1504 | * If we have HIGHMEM or movable node, node_states[N_NORMAL_MEMORY] |
1505 | * contains nodes which have zones of 0...ZONE_NORMAL, | |
1506 | * set zone_last to ZONE_NORMAL. | |
d9713679 | 1507 | * |
6715ddf9 LJ |
1508 | * If we don't have HIGHMEM nor movable node, |
1509 | * node_states[N_NORMAL_MEMORY] contains nodes which have zones of | |
1510 | * 0...ZONE_MOVABLE, set zone_last to ZONE_MOVABLE. | |
d9713679 | 1511 | */ |
6715ddf9 | 1512 | if (N_MEMORY == N_NORMAL_MEMORY) |
d9713679 LJ |
1513 | zone_last = ZONE_MOVABLE; |
1514 | ||
1515 | /* | |
1516 | * check whether node_states[N_NORMAL_MEMORY] will be changed. | |
1517 | * If the memory to be offline is in a zone of 0...zone_last, | |
1518 | * and it is the last present memory, 0...zone_last will | |
1519 | * become empty after offline , thus we can determind we will | |
1520 | * need to clear the node from node_states[N_NORMAL_MEMORY]. | |
1521 | */ | |
1522 | for (zt = 0; zt <= zone_last; zt++) | |
1523 | present_pages += pgdat->node_zones[zt].present_pages; | |
1524 | if (zone_idx(zone) <= zone_last && nr_pages >= present_pages) | |
1525 | arg->status_change_nid_normal = zone_to_nid(zone); | |
1526 | else | |
1527 | arg->status_change_nid_normal = -1; | |
1528 | ||
6715ddf9 LJ |
1529 | #ifdef CONFIG_HIGHMEM |
1530 | /* | |
1531 | * If we have movable node, node_states[N_HIGH_MEMORY] | |
1532 | * contains nodes which have zones of 0...ZONE_HIGHMEM, | |
1533 | * set zone_last to ZONE_HIGHMEM. | |
1534 | * | |
1535 | * If we don't have movable node, node_states[N_NORMAL_MEMORY] | |
1536 | * contains nodes which have zones of 0...ZONE_MOVABLE, | |
1537 | * set zone_last to ZONE_MOVABLE. | |
1538 | */ | |
1539 | zone_last = ZONE_HIGHMEM; | |
1540 | if (N_MEMORY == N_HIGH_MEMORY) | |
1541 | zone_last = ZONE_MOVABLE; | |
1542 | ||
1543 | for (; zt <= zone_last; zt++) | |
1544 | present_pages += pgdat->node_zones[zt].present_pages; | |
1545 | if (zone_idx(zone) <= zone_last && nr_pages >= present_pages) | |
1546 | arg->status_change_nid_high = zone_to_nid(zone); | |
1547 | else | |
1548 | arg->status_change_nid_high = -1; | |
1549 | #else | |
1550 | arg->status_change_nid_high = arg->status_change_nid_normal; | |
1551 | #endif | |
1552 | ||
d9713679 LJ |
1553 | /* |
1554 | * node_states[N_HIGH_MEMORY] contains nodes which have 0...ZONE_MOVABLE | |
1555 | */ | |
1556 | zone_last = ZONE_MOVABLE; | |
1557 | ||
1558 | /* | |
1559 | * check whether node_states[N_HIGH_MEMORY] will be changed | |
1560 | * If we try to offline the last present @nr_pages from the node, | |
1561 | * we can determind we will need to clear the node from | |
1562 | * node_states[N_HIGH_MEMORY]. | |
1563 | */ | |
1564 | for (; zt <= zone_last; zt++) | |
1565 | present_pages += pgdat->node_zones[zt].present_pages; | |
1566 | if (nr_pages >= present_pages) | |
1567 | arg->status_change_nid = zone_to_nid(zone); | |
1568 | else | |
1569 | arg->status_change_nid = -1; | |
1570 | } | |
1571 | ||
1572 | static void node_states_clear_node(int node, struct memory_notify *arg) | |
1573 | { | |
1574 | if (arg->status_change_nid_normal >= 0) | |
1575 | node_clear_state(node, N_NORMAL_MEMORY); | |
1576 | ||
6715ddf9 LJ |
1577 | if ((N_MEMORY != N_NORMAL_MEMORY) && |
1578 | (arg->status_change_nid_high >= 0)) | |
d9713679 | 1579 | node_clear_state(node, N_HIGH_MEMORY); |
6715ddf9 LJ |
1580 | |
1581 | if ((N_MEMORY != N_HIGH_MEMORY) && | |
1582 | (arg->status_change_nid >= 0)) | |
1583 | node_clear_state(node, N_MEMORY); | |
d9713679 LJ |
1584 | } |
1585 | ||
a16cee10 | 1586 | static int __ref __offline_pages(unsigned long start_pfn, |
ecde0f3e | 1587 | unsigned long end_pfn) |
0c0e6195 | 1588 | { |
ecde0f3e | 1589 | unsigned long pfn, nr_pages; |
0c0e6195 | 1590 | long offlined_pages; |
72b39cfc | 1591 | int ret, node; |
d702909f | 1592 | unsigned long flags; |
a96dfddb | 1593 | unsigned long valid_start, valid_end; |
0c0e6195 | 1594 | struct zone *zone; |
7b78d335 | 1595 | struct memory_notify arg; |
0c0e6195 | 1596 | |
0c0e6195 KH |
1597 | /* at least, alignment against pageblock is necessary */ |
1598 | if (!IS_ALIGNED(start_pfn, pageblock_nr_pages)) | |
1599 | return -EINVAL; | |
1600 | if (!IS_ALIGNED(end_pfn, pageblock_nr_pages)) | |
1601 | return -EINVAL; | |
1602 | /* This makes hotplug much easier...and readable. | |
1603 | we assume this for now. .*/ | |
a96dfddb | 1604 | if (!test_pages_in_a_zone(start_pfn, end_pfn, &valid_start, &valid_end)) |
0c0e6195 | 1605 | return -EINVAL; |
7b78d335 | 1606 | |
a96dfddb | 1607 | zone = page_zone(pfn_to_page(valid_start)); |
7b78d335 YG |
1608 | node = zone_to_nid(zone); |
1609 | nr_pages = end_pfn - start_pfn; | |
1610 | ||
0c0e6195 | 1611 | /* set above range as isolated */ |
b023f468 WC |
1612 | ret = start_isolate_page_range(start_pfn, end_pfn, |
1613 | MIGRATE_MOVABLE, true); | |
0c0e6195 | 1614 | if (ret) |
30467e0b | 1615 | return ret; |
7b78d335 YG |
1616 | |
1617 | arg.start_pfn = start_pfn; | |
1618 | arg.nr_pages = nr_pages; | |
d9713679 | 1619 | node_states_check_changes_offline(nr_pages, zone, &arg); |
7b78d335 YG |
1620 | |
1621 | ret = memory_notify(MEM_GOING_OFFLINE, &arg); | |
1622 | ret = notifier_to_errno(ret); | |
1623 | if (ret) | |
1624 | goto failed_removal; | |
1625 | ||
0c0e6195 | 1626 | pfn = start_pfn; |
0c0e6195 KH |
1627 | repeat: |
1628 | /* start memory hot removal */ | |
0c0e6195 KH |
1629 | ret = -EINTR; |
1630 | if (signal_pending(current)) | |
1631 | goto failed_removal; | |
72b39cfc MH |
1632 | |
1633 | cond_resched(); | |
9852a721 | 1634 | lru_add_drain_all(); |
72b39cfc | 1635 | drain_all_pages(zone); |
0c0e6195 | 1636 | |
c8721bbb NH |
1637 | pfn = scan_movable_pages(start_pfn, end_pfn); |
1638 | if (pfn) { /* We have movable pages */ | |
0c0e6195 | 1639 | ret = do_migrate_range(pfn, end_pfn); |
72b39cfc | 1640 | goto repeat; |
0c0e6195 | 1641 | } |
72b39cfc | 1642 | |
c8721bbb NH |
1643 | /* |
1644 | * dissolve free hugepages in the memory block before doing offlining | |
1645 | * actually in order to make hugetlbfs's object counting consistent. | |
1646 | */ | |
082d5b6b GS |
1647 | ret = dissolve_free_huge_pages(start_pfn, end_pfn); |
1648 | if (ret) | |
1649 | goto failed_removal; | |
0c0e6195 KH |
1650 | /* check again */ |
1651 | offlined_pages = check_pages_isolated(start_pfn, end_pfn); | |
72b39cfc MH |
1652 | if (offlined_pages < 0) |
1653 | goto repeat; | |
e33e33b4 | 1654 | pr_info("Offlined Pages %ld\n", offlined_pages); |
b3834be5 | 1655 | /* Ok, all of our target is isolated. |
0c0e6195 KH |
1656 | We cannot do rollback at this point. */ |
1657 | offline_isolated_pages(start_pfn, end_pfn); | |
dbc0e4ce | 1658 | /* reset pagetype flags and makes migrate type to be MOVABLE */ |
0815f3d8 | 1659 | undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE); |
0c0e6195 | 1660 | /* removal success */ |
3dcc0571 | 1661 | adjust_managed_page_count(pfn_to_page(start_pfn), -offlined_pages); |
0c0e6195 | 1662 | zone->present_pages -= offlined_pages; |
d702909f CS |
1663 | |
1664 | pgdat_resize_lock(zone->zone_pgdat, &flags); | |
0c0e6195 | 1665 | zone->zone_pgdat->node_present_pages -= offlined_pages; |
d702909f | 1666 | pgdat_resize_unlock(zone->zone_pgdat, &flags); |
7b78d335 | 1667 | |
1b79acc9 KM |
1668 | init_per_zone_wmark_min(); |
1669 | ||
1e8537ba | 1670 | if (!populated_zone(zone)) { |
340175b7 | 1671 | zone_pcp_reset(zone); |
72675e13 | 1672 | build_all_zonelists(NULL); |
1e8537ba XQ |
1673 | } else |
1674 | zone_pcp_update(zone); | |
340175b7 | 1675 | |
d9713679 | 1676 | node_states_clear_node(node, &arg); |
698b1b30 | 1677 | if (arg.status_change_nid >= 0) { |
8fe23e05 | 1678 | kswapd_stop(node); |
698b1b30 VB |
1679 | kcompactd_stop(node); |
1680 | } | |
bce7394a | 1681 | |
0c0e6195 KH |
1682 | vm_total_pages = nr_free_pagecache_pages(); |
1683 | writeback_set_ratelimit(); | |
7b78d335 YG |
1684 | |
1685 | memory_notify(MEM_OFFLINE, &arg); | |
0c0e6195 KH |
1686 | return 0; |
1687 | ||
1688 | failed_removal: | |
e33e33b4 CY |
1689 | pr_debug("memory offlining [mem %#010llx-%#010llx] failed\n", |
1690 | (unsigned long long) start_pfn << PAGE_SHIFT, | |
1691 | ((unsigned long long) end_pfn << PAGE_SHIFT) - 1); | |
7b78d335 | 1692 | memory_notify(MEM_CANCEL_OFFLINE, &arg); |
0c0e6195 | 1693 | /* pushback to free area */ |
0815f3d8 | 1694 | undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE); |
0c0e6195 KH |
1695 | return ret; |
1696 | } | |
71088785 | 1697 | |
b93e0f32 | 1698 | /* Must be protected by mem_hotplug_begin() or a device_lock */ |
a16cee10 WC |
1699 | int offline_pages(unsigned long start_pfn, unsigned long nr_pages) |
1700 | { | |
ecde0f3e | 1701 | return __offline_pages(start_pfn, start_pfn + nr_pages); |
a16cee10 | 1702 | } |
e2ff3940 | 1703 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
a16cee10 | 1704 | |
bbc76be6 WC |
1705 | /** |
1706 | * walk_memory_range - walks through all mem sections in [start_pfn, end_pfn) | |
1707 | * @start_pfn: start pfn of the memory range | |
e05c4bbf | 1708 | * @end_pfn: end pfn of the memory range |
bbc76be6 WC |
1709 | * @arg: argument passed to func |
1710 | * @func: callback for each memory section walked | |
1711 | * | |
1712 | * This function walks through all present mem sections in range | |
1713 | * [start_pfn, end_pfn) and call func on each mem section. | |
1714 | * | |
1715 | * Returns the return value of func. | |
1716 | */ | |
e2ff3940 | 1717 | int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn, |
bbc76be6 | 1718 | void *arg, int (*func)(struct memory_block *, void *)) |
71088785 | 1719 | { |
e90bdb7f WC |
1720 | struct memory_block *mem = NULL; |
1721 | struct mem_section *section; | |
e90bdb7f WC |
1722 | unsigned long pfn, section_nr; |
1723 | int ret; | |
e90bdb7f WC |
1724 | |
1725 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { | |
1726 | section_nr = pfn_to_section_nr(pfn); | |
1727 | if (!present_section_nr(section_nr)) | |
1728 | continue; | |
1729 | ||
1730 | section = __nr_to_section(section_nr); | |
1731 | /* same memblock? */ | |
1732 | if (mem) | |
1733 | if ((section_nr >= mem->start_section_nr) && | |
1734 | (section_nr <= mem->end_section_nr)) | |
1735 | continue; | |
1736 | ||
1737 | mem = find_memory_block_hinted(section, mem); | |
1738 | if (!mem) | |
1739 | continue; | |
1740 | ||
bbc76be6 | 1741 | ret = func(mem, arg); |
e90bdb7f | 1742 | if (ret) { |
bbc76be6 WC |
1743 | kobject_put(&mem->dev.kobj); |
1744 | return ret; | |
e90bdb7f WC |
1745 | } |
1746 | } | |
1747 | ||
1748 | if (mem) | |
1749 | kobject_put(&mem->dev.kobj); | |
1750 | ||
bbc76be6 WC |
1751 | return 0; |
1752 | } | |
1753 | ||
e2ff3940 | 1754 | #ifdef CONFIG_MEMORY_HOTREMOVE |
d6de9d53 | 1755 | static int check_memblock_offlined_cb(struct memory_block *mem, void *arg) |
bbc76be6 WC |
1756 | { |
1757 | int ret = !is_memblock_offlined(mem); | |
1758 | ||
349daa0f RD |
1759 | if (unlikely(ret)) { |
1760 | phys_addr_t beginpa, endpa; | |
1761 | ||
1762 | beginpa = PFN_PHYS(section_nr_to_pfn(mem->start_section_nr)); | |
1763 | endpa = PFN_PHYS(section_nr_to_pfn(mem->end_section_nr + 1))-1; | |
756a025f | 1764 | pr_warn("removing memory fails, because memory [%pa-%pa] is onlined\n", |
349daa0f RD |
1765 | &beginpa, &endpa); |
1766 | } | |
bbc76be6 WC |
1767 | |
1768 | return ret; | |
1769 | } | |
1770 | ||
0f1cfe9d | 1771 | static int check_cpu_on_node(pg_data_t *pgdat) |
60a5a19e | 1772 | { |
60a5a19e TC |
1773 | int cpu; |
1774 | ||
1775 | for_each_present_cpu(cpu) { | |
1776 | if (cpu_to_node(cpu) == pgdat->node_id) | |
1777 | /* | |
1778 | * the cpu on this node isn't removed, and we can't | |
1779 | * offline this node. | |
1780 | */ | |
1781 | return -EBUSY; | |
1782 | } | |
1783 | ||
1784 | return 0; | |
1785 | } | |
1786 | ||
0f1cfe9d | 1787 | static void unmap_cpu_on_node(pg_data_t *pgdat) |
e13fe869 WC |
1788 | { |
1789 | #ifdef CONFIG_ACPI_NUMA | |
e13fe869 WC |
1790 | int cpu; |
1791 | ||
1792 | for_each_possible_cpu(cpu) | |
1793 | if (cpu_to_node(cpu) == pgdat->node_id) | |
1794 | numa_clear_node(cpu); | |
1795 | #endif | |
1796 | } | |
1797 | ||
0f1cfe9d | 1798 | static int check_and_unmap_cpu_on_node(pg_data_t *pgdat) |
e13fe869 | 1799 | { |
0f1cfe9d | 1800 | int ret; |
e13fe869 | 1801 | |
0f1cfe9d | 1802 | ret = check_cpu_on_node(pgdat); |
e13fe869 WC |
1803 | if (ret) |
1804 | return ret; | |
1805 | ||
1806 | /* | |
1807 | * the node will be offlined when we come here, so we can clear | |
1808 | * the cpu_to_node() now. | |
1809 | */ | |
1810 | ||
0f1cfe9d | 1811 | unmap_cpu_on_node(pgdat); |
e13fe869 WC |
1812 | return 0; |
1813 | } | |
1814 | ||
0f1cfe9d TK |
1815 | /** |
1816 | * try_offline_node | |
1817 | * | |
1818 | * Offline a node if all memory sections and cpus of the node are removed. | |
1819 | * | |
1820 | * NOTE: The caller must call lock_device_hotplug() to serialize hotplug | |
1821 | * and online/offline operations before this call. | |
1822 | */ | |
90b30cdc | 1823 | void try_offline_node(int nid) |
60a5a19e | 1824 | { |
d822b86a WC |
1825 | pg_data_t *pgdat = NODE_DATA(nid); |
1826 | unsigned long start_pfn = pgdat->node_start_pfn; | |
1827 | unsigned long end_pfn = start_pfn + pgdat->node_spanned_pages; | |
60a5a19e TC |
1828 | unsigned long pfn; |
1829 | ||
1830 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { | |
1831 | unsigned long section_nr = pfn_to_section_nr(pfn); | |
1832 | ||
1833 | if (!present_section_nr(section_nr)) | |
1834 | continue; | |
1835 | ||
1836 | if (pfn_to_nid(pfn) != nid) | |
1837 | continue; | |
1838 | ||
1839 | /* | |
1840 | * some memory sections of this node are not removed, and we | |
1841 | * can't offline node now. | |
1842 | */ | |
1843 | return; | |
1844 | } | |
1845 | ||
0f1cfe9d | 1846 | if (check_and_unmap_cpu_on_node(pgdat)) |
60a5a19e TC |
1847 | return; |
1848 | ||
1849 | /* | |
1850 | * all memory/cpu of this node are removed, we can offline this | |
1851 | * node now. | |
1852 | */ | |
1853 | node_set_offline(nid); | |
1854 | unregister_one_node(nid); | |
1855 | } | |
90b30cdc | 1856 | EXPORT_SYMBOL(try_offline_node); |
60a5a19e | 1857 | |
0f1cfe9d TK |
1858 | /** |
1859 | * remove_memory | |
1860 | * | |
1861 | * NOTE: The caller must call lock_device_hotplug() to serialize hotplug | |
1862 | * and online/offline operations before this call, as required by | |
1863 | * try_offline_node(). | |
1864 | */ | |
242831eb | 1865 | void __ref remove_memory(int nid, u64 start, u64 size) |
bbc76be6 | 1866 | { |
242831eb | 1867 | int ret; |
993c1aad | 1868 | |
27356f54 TK |
1869 | BUG_ON(check_hotplug_memory_range(start, size)); |
1870 | ||
bfc8c901 | 1871 | mem_hotplug_begin(); |
6677e3ea YI |
1872 | |
1873 | /* | |
242831eb RW |
1874 | * All memory blocks must be offlined before removing memory. Check |
1875 | * whether all memory blocks in question are offline and trigger a BUG() | |
1876 | * if this is not the case. | |
6677e3ea | 1877 | */ |
242831eb | 1878 | ret = walk_memory_range(PFN_DOWN(start), PFN_UP(start + size - 1), NULL, |
d6de9d53 | 1879 | check_memblock_offlined_cb); |
bfc8c901 | 1880 | if (ret) |
242831eb | 1881 | BUG(); |
6677e3ea | 1882 | |
46c66c4b YI |
1883 | /* remove memmap entry */ |
1884 | firmware_map_remove(start, start + size, "System RAM"); | |
f9126ab9 XQ |
1885 | memblock_free(start, size); |
1886 | memblock_remove(start, size); | |
46c66c4b | 1887 | |
da024512 | 1888 | arch_remove_memory(start, size, NULL); |
24d335ca | 1889 | |
60a5a19e TC |
1890 | try_offline_node(nid); |
1891 | ||
bfc8c901 | 1892 | mem_hotplug_done(); |
71088785 | 1893 | } |
71088785 | 1894 | EXPORT_SYMBOL_GPL(remove_memory); |
aba6efc4 | 1895 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |