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 | ||
187 | usemap = __nr_to_section(section_nr)->pageblock_flags; | |
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 | ||
203 | if (!pfn_valid(start_pfn)) | |
204 | return; | |
205 | ||
206 | section_nr = pfn_to_section_nr(start_pfn); | |
207 | ms = __nr_to_section(section_nr); | |
208 | ||
209 | memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); | |
210 | ||
211 | register_page_bootmem_memmap(section_nr, memmap, PAGES_PER_SECTION); | |
212 | ||
213 | usemap = __nr_to_section(section_nr)->pageblock_flags; | |
214 | page = virt_to_page(usemap); | |
215 | ||
216 | mapsize = PAGE_ALIGN(usemap_size()) >> PAGE_SHIFT; | |
217 | ||
218 | for (i = 0; i < mapsize; i++, page++) | |
219 | get_page_bootmem(section_nr, page, MIX_SECTION_INFO); | |
220 | } | |
221 | #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ | |
04753278 | 222 | |
7ded384a | 223 | void __init register_page_bootmem_info_node(struct pglist_data *pgdat) |
04753278 YG |
224 | { |
225 | unsigned long i, pfn, end_pfn, nr_pages; | |
226 | int node = pgdat->node_id; | |
227 | struct page *page; | |
04753278 YG |
228 | |
229 | nr_pages = PAGE_ALIGN(sizeof(struct pglist_data)) >> PAGE_SHIFT; | |
230 | page = virt_to_page(pgdat); | |
231 | ||
232 | for (i = 0; i < nr_pages; i++, page++) | |
233 | get_page_bootmem(node, page, NODE_INFO); | |
234 | ||
04753278 | 235 | pfn = pgdat->node_start_pfn; |
c1f19495 | 236 | end_pfn = pgdat_end_pfn(pgdat); |
04753278 | 237 | |
7e9f5eb0 | 238 | /* register section info */ |
f14851af | 239 | for (; pfn < end_pfn; pfn += PAGES_PER_SECTION) { |
240 | /* | |
241 | * Some platforms can assign the same pfn to multiple nodes - on | |
242 | * node0 as well as nodeN. To avoid registering a pfn against | |
243 | * multiple nodes we check that this pfn does not already | |
7e9f5eb0 | 244 | * reside in some other nodes. |
f14851af | 245 | */ |
f65e91df | 246 | if (pfn_valid(pfn) && (early_pfn_to_nid(pfn) == node)) |
f14851af | 247 | register_page_bootmem_info_section(pfn); |
248 | } | |
04753278 | 249 | } |
46723bfa | 250 | #endif /* CONFIG_HAVE_BOOTMEM_INFO_NODE */ |
04753278 | 251 | |
f1dd2cd1 MH |
252 | static int __meminit __add_section(int nid, unsigned long phys_start_pfn, |
253 | bool want_memblock) | |
3947be19 | 254 | { |
3947be19 | 255 | int ret; |
f1dd2cd1 | 256 | int i; |
3947be19 | 257 | |
ebd15302 KH |
258 | if (pfn_valid(phys_start_pfn)) |
259 | return -EEXIST; | |
260 | ||
f1dd2cd1 | 261 | ret = sparse_add_one_section(NODE_DATA(nid), phys_start_pfn); |
3947be19 DH |
262 | if (ret < 0) |
263 | return ret; | |
264 | ||
f1dd2cd1 MH |
265 | /* |
266 | * Make all the pages reserved so that nobody will stumble over half | |
267 | * initialized state. | |
268 | * FIXME: We also have to associate it with a node because pfn_to_node | |
269 | * relies on having page with the proper node. | |
270 | */ | |
271 | for (i = 0; i < PAGES_PER_SECTION; i++) { | |
272 | unsigned long pfn = phys_start_pfn + i; | |
273 | struct page *page; | |
274 | if (!pfn_valid(pfn)) | |
275 | continue; | |
718127cc | 276 | |
f1dd2cd1 MH |
277 | page = pfn_to_page(pfn); |
278 | set_page_node(page, nid); | |
279 | SetPageReserved(page); | |
280 | } | |
718127cc | 281 | |
1b862aec MH |
282 | if (!want_memblock) |
283 | return 0; | |
284 | ||
c04fc586 | 285 | return register_new_memory(nid, __pfn_to_section(phys_start_pfn)); |
3947be19 DH |
286 | } |
287 | ||
4edd7cef DR |
288 | /* |
289 | * Reasonably generic function for adding memory. It is | |
290 | * expected that archs that support memory hotplug will | |
291 | * call this function after deciding the zone to which to | |
292 | * add the new pages. | |
293 | */ | |
f1dd2cd1 | 294 | int __ref __add_pages(int nid, unsigned long phys_start_pfn, |
1b862aec | 295 | unsigned long nr_pages, bool want_memblock) |
4edd7cef DR |
296 | { |
297 | unsigned long i; | |
298 | int err = 0; | |
299 | int start_sec, end_sec; | |
4b94ffdc DW |
300 | struct vmem_altmap *altmap; |
301 | ||
4edd7cef DR |
302 | /* during initialize mem_map, align hot-added range to section */ |
303 | start_sec = pfn_to_section_nr(phys_start_pfn); | |
304 | end_sec = pfn_to_section_nr(phys_start_pfn + nr_pages - 1); | |
305 | ||
4b94ffdc DW |
306 | altmap = to_vmem_altmap((unsigned long) pfn_to_page(phys_start_pfn)); |
307 | if (altmap) { | |
308 | /* | |
309 | * Validate altmap is within bounds of the total request | |
310 | */ | |
311 | if (altmap->base_pfn != phys_start_pfn | |
312 | || vmem_altmap_offset(altmap) > nr_pages) { | |
313 | pr_warn_once("memory add fail, invalid altmap\n"); | |
7cf91a98 JK |
314 | err = -EINVAL; |
315 | goto out; | |
4b94ffdc DW |
316 | } |
317 | altmap->alloc = 0; | |
318 | } | |
319 | ||
4edd7cef | 320 | for (i = start_sec; i <= end_sec; i++) { |
f1dd2cd1 | 321 | err = __add_section(nid, section_nr_to_pfn(i), want_memblock); |
4edd7cef DR |
322 | |
323 | /* | |
324 | * EEXIST is finally dealt with by ioresource collision | |
325 | * check. see add_memory() => register_memory_resource() | |
326 | * Warning will be printed if there is collision. | |
327 | */ | |
328 | if (err && (err != -EEXIST)) | |
329 | break; | |
330 | err = 0; | |
f64ac5e6 | 331 | cond_resched(); |
4edd7cef | 332 | } |
c435a390 | 333 | vmemmap_populate_print_last(); |
7cf91a98 | 334 | out: |
4edd7cef DR |
335 | return err; |
336 | } | |
337 | EXPORT_SYMBOL_GPL(__add_pages); | |
338 | ||
339 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
815121d2 | 340 | /* find the smallest valid pfn in the range [start_pfn, end_pfn) */ |
d09b0137 | 341 | static unsigned long find_smallest_section_pfn(int nid, struct zone *zone, |
815121d2 YI |
342 | unsigned long start_pfn, |
343 | unsigned long end_pfn) | |
344 | { | |
345 | struct mem_section *ms; | |
346 | ||
347 | for (; start_pfn < end_pfn; start_pfn += PAGES_PER_SECTION) { | |
348 | ms = __pfn_to_section(start_pfn); | |
349 | ||
350 | if (unlikely(!valid_section(ms))) | |
351 | continue; | |
352 | ||
353 | if (unlikely(pfn_to_nid(start_pfn) != nid)) | |
354 | continue; | |
355 | ||
356 | if (zone && zone != page_zone(pfn_to_page(start_pfn))) | |
357 | continue; | |
358 | ||
359 | return start_pfn; | |
360 | } | |
361 | ||
362 | return 0; | |
363 | } | |
364 | ||
365 | /* find the biggest valid pfn in the range [start_pfn, end_pfn). */ | |
d09b0137 | 366 | static unsigned long find_biggest_section_pfn(int nid, struct zone *zone, |
815121d2 YI |
367 | unsigned long start_pfn, |
368 | unsigned long end_pfn) | |
369 | { | |
370 | struct mem_section *ms; | |
371 | unsigned long pfn; | |
372 | ||
373 | /* pfn is the end pfn of a memory section. */ | |
374 | pfn = end_pfn - 1; | |
375 | for (; pfn >= start_pfn; pfn -= PAGES_PER_SECTION) { | |
376 | ms = __pfn_to_section(pfn); | |
377 | ||
378 | if (unlikely(!valid_section(ms))) | |
379 | continue; | |
380 | ||
381 | if (unlikely(pfn_to_nid(pfn) != nid)) | |
382 | continue; | |
383 | ||
384 | if (zone && zone != page_zone(pfn_to_page(pfn))) | |
385 | continue; | |
386 | ||
387 | return pfn; | |
388 | } | |
389 | ||
390 | return 0; | |
391 | } | |
392 | ||
393 | static void shrink_zone_span(struct zone *zone, unsigned long start_pfn, | |
394 | unsigned long end_pfn) | |
395 | { | |
c33bc315 XQ |
396 | unsigned long zone_start_pfn = zone->zone_start_pfn; |
397 | unsigned long z = zone_end_pfn(zone); /* zone_end_pfn namespace clash */ | |
398 | unsigned long zone_end_pfn = z; | |
815121d2 YI |
399 | unsigned long pfn; |
400 | struct mem_section *ms; | |
401 | int nid = zone_to_nid(zone); | |
402 | ||
403 | zone_span_writelock(zone); | |
404 | if (zone_start_pfn == start_pfn) { | |
405 | /* | |
406 | * If the section is smallest section in the zone, it need | |
407 | * shrink zone->zone_start_pfn and zone->zone_spanned_pages. | |
408 | * In this case, we find second smallest valid mem_section | |
409 | * for shrinking zone. | |
410 | */ | |
411 | pfn = find_smallest_section_pfn(nid, zone, end_pfn, | |
412 | zone_end_pfn); | |
413 | if (pfn) { | |
414 | zone->zone_start_pfn = pfn; | |
415 | zone->spanned_pages = zone_end_pfn - pfn; | |
416 | } | |
417 | } else if (zone_end_pfn == end_pfn) { | |
418 | /* | |
419 | * If the section is biggest section in the zone, it need | |
420 | * shrink zone->spanned_pages. | |
421 | * In this case, we find second biggest valid mem_section for | |
422 | * shrinking zone. | |
423 | */ | |
424 | pfn = find_biggest_section_pfn(nid, zone, zone_start_pfn, | |
425 | start_pfn); | |
426 | if (pfn) | |
427 | zone->spanned_pages = pfn - zone_start_pfn + 1; | |
428 | } | |
429 | ||
430 | /* | |
431 | * The section is not biggest or smallest mem_section in the zone, it | |
432 | * only creates a hole in the zone. So in this case, we need not | |
433 | * change the zone. But perhaps, the zone has only hole data. Thus | |
434 | * it check the zone has only hole or not. | |
435 | */ | |
436 | pfn = zone_start_pfn; | |
437 | for (; pfn < zone_end_pfn; pfn += PAGES_PER_SECTION) { | |
438 | ms = __pfn_to_section(pfn); | |
439 | ||
440 | if (unlikely(!valid_section(ms))) | |
441 | continue; | |
442 | ||
443 | if (page_zone(pfn_to_page(pfn)) != zone) | |
444 | continue; | |
445 | ||
446 | /* If the section is current section, it continues the loop */ | |
447 | if (start_pfn == pfn) | |
448 | continue; | |
449 | ||
450 | /* If we find valid section, we have nothing to do */ | |
451 | zone_span_writeunlock(zone); | |
452 | return; | |
453 | } | |
454 | ||
455 | /* The zone has no valid section */ | |
456 | zone->zone_start_pfn = 0; | |
457 | zone->spanned_pages = 0; | |
458 | zone_span_writeunlock(zone); | |
459 | } | |
460 | ||
461 | static void shrink_pgdat_span(struct pglist_data *pgdat, | |
462 | unsigned long start_pfn, unsigned long end_pfn) | |
463 | { | |
83285c72 XQ |
464 | unsigned long pgdat_start_pfn = pgdat->node_start_pfn; |
465 | unsigned long p = pgdat_end_pfn(pgdat); /* pgdat_end_pfn namespace clash */ | |
466 | unsigned long pgdat_end_pfn = p; | |
815121d2 YI |
467 | unsigned long pfn; |
468 | struct mem_section *ms; | |
469 | int nid = pgdat->node_id; | |
470 | ||
471 | if (pgdat_start_pfn == start_pfn) { | |
472 | /* | |
473 | * If the section is smallest section in the pgdat, it need | |
474 | * shrink pgdat->node_start_pfn and pgdat->node_spanned_pages. | |
475 | * In this case, we find second smallest valid mem_section | |
476 | * for shrinking zone. | |
477 | */ | |
478 | pfn = find_smallest_section_pfn(nid, NULL, end_pfn, | |
479 | pgdat_end_pfn); | |
480 | if (pfn) { | |
481 | pgdat->node_start_pfn = pfn; | |
482 | pgdat->node_spanned_pages = pgdat_end_pfn - pfn; | |
483 | } | |
484 | } else if (pgdat_end_pfn == end_pfn) { | |
485 | /* | |
486 | * If the section is biggest section in the pgdat, it need | |
487 | * shrink pgdat->node_spanned_pages. | |
488 | * In this case, we find second biggest valid mem_section for | |
489 | * shrinking zone. | |
490 | */ | |
491 | pfn = find_biggest_section_pfn(nid, NULL, pgdat_start_pfn, | |
492 | start_pfn); | |
493 | if (pfn) | |
494 | pgdat->node_spanned_pages = pfn - pgdat_start_pfn + 1; | |
495 | } | |
496 | ||
497 | /* | |
498 | * If the section is not biggest or smallest mem_section in the pgdat, | |
499 | * it only creates a hole in the pgdat. So in this case, we need not | |
500 | * change the pgdat. | |
501 | * But perhaps, the pgdat has only hole data. Thus it check the pgdat | |
502 | * has only hole or not. | |
503 | */ | |
504 | pfn = pgdat_start_pfn; | |
505 | for (; pfn < pgdat_end_pfn; pfn += PAGES_PER_SECTION) { | |
506 | ms = __pfn_to_section(pfn); | |
507 | ||
508 | if (unlikely(!valid_section(ms))) | |
509 | continue; | |
510 | ||
511 | if (pfn_to_nid(pfn) != nid) | |
512 | continue; | |
513 | ||
514 | /* If the section is current section, it continues the loop */ | |
515 | if (start_pfn == pfn) | |
516 | continue; | |
517 | ||
518 | /* If we find valid section, we have nothing to do */ | |
519 | return; | |
520 | } | |
521 | ||
522 | /* The pgdat has no valid section */ | |
523 | pgdat->node_start_pfn = 0; | |
524 | pgdat->node_spanned_pages = 0; | |
525 | } | |
526 | ||
527 | static void __remove_zone(struct zone *zone, unsigned long start_pfn) | |
528 | { | |
529 | struct pglist_data *pgdat = zone->zone_pgdat; | |
530 | int nr_pages = PAGES_PER_SECTION; | |
815121d2 YI |
531 | unsigned long flags; |
532 | ||
815121d2 YI |
533 | pgdat_resize_lock(zone->zone_pgdat, &flags); |
534 | shrink_zone_span(zone, start_pfn, start_pfn + nr_pages); | |
535 | shrink_pgdat_span(pgdat, start_pfn, start_pfn + nr_pages); | |
536 | pgdat_resize_unlock(zone->zone_pgdat, &flags); | |
537 | } | |
538 | ||
4b94ffdc DW |
539 | static int __remove_section(struct zone *zone, struct mem_section *ms, |
540 | unsigned long map_offset) | |
ea01ea93 | 541 | { |
815121d2 YI |
542 | unsigned long start_pfn; |
543 | int scn_nr; | |
ea01ea93 BP |
544 | int ret = -EINVAL; |
545 | ||
546 | if (!valid_section(ms)) | |
547 | return ret; | |
548 | ||
549 | ret = unregister_memory_section(ms); | |
550 | if (ret) | |
551 | return ret; | |
552 | ||
815121d2 | 553 | scn_nr = __section_nr(ms); |
1dd2bfc8 | 554 | start_pfn = section_nr_to_pfn((unsigned long)scn_nr); |
815121d2 YI |
555 | __remove_zone(zone, start_pfn); |
556 | ||
4b94ffdc | 557 | sparse_remove_one_section(zone, ms, map_offset); |
ea01ea93 BP |
558 | return 0; |
559 | } | |
560 | ||
ea01ea93 BP |
561 | /** |
562 | * __remove_pages() - remove sections of pages from a zone | |
563 | * @zone: zone from which pages need to be removed | |
564 | * @phys_start_pfn: starting pageframe (must be aligned to start of a section) | |
565 | * @nr_pages: number of pages to remove (must be multiple of section size) | |
566 | * | |
567 | * Generic helper function to remove section mappings and sysfs entries | |
568 | * for the section of the memory we are removing. Caller needs to make | |
569 | * sure that pages are marked reserved and zones are adjust properly by | |
570 | * calling offline_pages(). | |
571 | */ | |
572 | int __remove_pages(struct zone *zone, unsigned long phys_start_pfn, | |
573 | unsigned long nr_pages) | |
574 | { | |
fe74ebb1 | 575 | unsigned long i; |
4b94ffdc DW |
576 | unsigned long map_offset = 0; |
577 | int sections_to_remove, ret = 0; | |
578 | ||
579 | /* In the ZONE_DEVICE case device driver owns the memory region */ | |
580 | if (is_dev_zone(zone)) { | |
581 | struct page *page = pfn_to_page(phys_start_pfn); | |
582 | struct vmem_altmap *altmap; | |
583 | ||
584 | altmap = to_vmem_altmap((unsigned long) page); | |
585 | if (altmap) | |
586 | map_offset = vmem_altmap_offset(altmap); | |
587 | } else { | |
588 | resource_size_t start, size; | |
589 | ||
590 | start = phys_start_pfn << PAGE_SHIFT; | |
591 | size = nr_pages * PAGE_SIZE; | |
592 | ||
593 | ret = release_mem_region_adjustable(&iomem_resource, start, | |
594 | size); | |
595 | if (ret) { | |
596 | resource_size_t endres = start + size - 1; | |
597 | ||
598 | pr_warn("Unable to release resource <%pa-%pa> (%d)\n", | |
599 | &start, &endres, ret); | |
600 | } | |
601 | } | |
ea01ea93 | 602 | |
7cf91a98 JK |
603 | clear_zone_contiguous(zone); |
604 | ||
ea01ea93 BP |
605 | /* |
606 | * We can only remove entire sections | |
607 | */ | |
608 | BUG_ON(phys_start_pfn & ~PAGE_SECTION_MASK); | |
609 | BUG_ON(nr_pages % PAGES_PER_SECTION); | |
610 | ||
ea01ea93 BP |
611 | sections_to_remove = nr_pages / PAGES_PER_SECTION; |
612 | for (i = 0; i < sections_to_remove; i++) { | |
613 | unsigned long pfn = phys_start_pfn + i*PAGES_PER_SECTION; | |
4b94ffdc DW |
614 | |
615 | ret = __remove_section(zone, __pfn_to_section(pfn), map_offset); | |
616 | map_offset = 0; | |
ea01ea93 BP |
617 | if (ret) |
618 | break; | |
619 | } | |
7cf91a98 JK |
620 | |
621 | set_zone_contiguous(zone); | |
622 | ||
ea01ea93 BP |
623 | return ret; |
624 | } | |
4edd7cef | 625 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
ea01ea93 | 626 | |
9d0ad8ca DK |
627 | int set_online_page_callback(online_page_callback_t callback) |
628 | { | |
629 | int rc = -EINVAL; | |
630 | ||
bfc8c901 VD |
631 | get_online_mems(); |
632 | mutex_lock(&online_page_callback_lock); | |
9d0ad8ca DK |
633 | |
634 | if (online_page_callback == generic_online_page) { | |
635 | online_page_callback = callback; | |
636 | rc = 0; | |
637 | } | |
638 | ||
bfc8c901 VD |
639 | mutex_unlock(&online_page_callback_lock); |
640 | put_online_mems(); | |
9d0ad8ca DK |
641 | |
642 | return rc; | |
643 | } | |
644 | EXPORT_SYMBOL_GPL(set_online_page_callback); | |
645 | ||
646 | int restore_online_page_callback(online_page_callback_t callback) | |
647 | { | |
648 | int rc = -EINVAL; | |
649 | ||
bfc8c901 VD |
650 | get_online_mems(); |
651 | mutex_lock(&online_page_callback_lock); | |
9d0ad8ca DK |
652 | |
653 | if (online_page_callback == callback) { | |
654 | online_page_callback = generic_online_page; | |
655 | rc = 0; | |
656 | } | |
657 | ||
bfc8c901 VD |
658 | mutex_unlock(&online_page_callback_lock); |
659 | put_online_mems(); | |
9d0ad8ca DK |
660 | |
661 | return rc; | |
662 | } | |
663 | EXPORT_SYMBOL_GPL(restore_online_page_callback); | |
664 | ||
665 | void __online_page_set_limits(struct page *page) | |
180c06ef | 666 | { |
9d0ad8ca DK |
667 | } |
668 | EXPORT_SYMBOL_GPL(__online_page_set_limits); | |
669 | ||
670 | void __online_page_increment_counters(struct page *page) | |
671 | { | |
3dcc0571 | 672 | adjust_managed_page_count(page, 1); |
9d0ad8ca DK |
673 | } |
674 | EXPORT_SYMBOL_GPL(__online_page_increment_counters); | |
180c06ef | 675 | |
9d0ad8ca DK |
676 | void __online_page_free(struct page *page) |
677 | { | |
3dcc0571 | 678 | __free_reserved_page(page); |
180c06ef | 679 | } |
9d0ad8ca DK |
680 | EXPORT_SYMBOL_GPL(__online_page_free); |
681 | ||
682 | static void generic_online_page(struct page *page) | |
683 | { | |
684 | __online_page_set_limits(page); | |
685 | __online_page_increment_counters(page); | |
686 | __online_page_free(page); | |
687 | } | |
180c06ef | 688 | |
75884fb1 KH |
689 | static int online_pages_range(unsigned long start_pfn, unsigned long nr_pages, |
690 | void *arg) | |
3947be19 DH |
691 | { |
692 | unsigned long i; | |
75884fb1 KH |
693 | unsigned long onlined_pages = *(unsigned long *)arg; |
694 | struct page *page; | |
2d070eab | 695 | |
75884fb1 KH |
696 | if (PageReserved(pfn_to_page(start_pfn))) |
697 | for (i = 0; i < nr_pages; i++) { | |
698 | page = pfn_to_page(start_pfn + i); | |
9d0ad8ca | 699 | (*online_page_callback)(page); |
75884fb1 KH |
700 | onlined_pages++; |
701 | } | |
2d070eab MH |
702 | |
703 | online_mem_sections(start_pfn, start_pfn + nr_pages); | |
704 | ||
75884fb1 KH |
705 | *(unsigned long *)arg = onlined_pages; |
706 | return 0; | |
707 | } | |
708 | ||
d9713679 LJ |
709 | /* check which state of node_states will be changed when online memory */ |
710 | static void node_states_check_changes_online(unsigned long nr_pages, | |
711 | struct zone *zone, struct memory_notify *arg) | |
712 | { | |
713 | int nid = zone_to_nid(zone); | |
714 | enum zone_type zone_last = ZONE_NORMAL; | |
715 | ||
716 | /* | |
6715ddf9 LJ |
717 | * If we have HIGHMEM or movable node, node_states[N_NORMAL_MEMORY] |
718 | * contains nodes which have zones of 0...ZONE_NORMAL, | |
719 | * set zone_last to ZONE_NORMAL. | |
d9713679 | 720 | * |
6715ddf9 LJ |
721 | * If we don't have HIGHMEM nor movable node, |
722 | * node_states[N_NORMAL_MEMORY] contains nodes which have zones of | |
723 | * 0...ZONE_MOVABLE, set zone_last to ZONE_MOVABLE. | |
d9713679 | 724 | */ |
6715ddf9 | 725 | if (N_MEMORY == N_NORMAL_MEMORY) |
d9713679 LJ |
726 | zone_last = ZONE_MOVABLE; |
727 | ||
728 | /* | |
729 | * if the memory to be online is in a zone of 0...zone_last, and | |
730 | * the zones of 0...zone_last don't have memory before online, we will | |
731 | * need to set the node to node_states[N_NORMAL_MEMORY] after | |
732 | * the memory is online. | |
733 | */ | |
734 | if (zone_idx(zone) <= zone_last && !node_state(nid, N_NORMAL_MEMORY)) | |
735 | arg->status_change_nid_normal = nid; | |
736 | else | |
737 | arg->status_change_nid_normal = -1; | |
738 | ||
6715ddf9 LJ |
739 | #ifdef CONFIG_HIGHMEM |
740 | /* | |
741 | * If we have movable node, node_states[N_HIGH_MEMORY] | |
742 | * contains nodes which have zones of 0...ZONE_HIGHMEM, | |
743 | * set zone_last to ZONE_HIGHMEM. | |
744 | * | |
745 | * If we don't have movable node, node_states[N_NORMAL_MEMORY] | |
746 | * contains nodes which have zones of 0...ZONE_MOVABLE, | |
747 | * set zone_last to ZONE_MOVABLE. | |
748 | */ | |
749 | zone_last = ZONE_HIGHMEM; | |
750 | if (N_MEMORY == N_HIGH_MEMORY) | |
751 | zone_last = ZONE_MOVABLE; | |
752 | ||
753 | if (zone_idx(zone) <= zone_last && !node_state(nid, N_HIGH_MEMORY)) | |
754 | arg->status_change_nid_high = nid; | |
755 | else | |
756 | arg->status_change_nid_high = -1; | |
757 | #else | |
758 | arg->status_change_nid_high = arg->status_change_nid_normal; | |
759 | #endif | |
760 | ||
d9713679 LJ |
761 | /* |
762 | * if the node don't have memory befor online, we will need to | |
6715ddf9 | 763 | * set the node to node_states[N_MEMORY] after the memory |
d9713679 LJ |
764 | * is online. |
765 | */ | |
6715ddf9 | 766 | if (!node_state(nid, N_MEMORY)) |
d9713679 LJ |
767 | arg->status_change_nid = nid; |
768 | else | |
769 | arg->status_change_nid = -1; | |
770 | } | |
771 | ||
772 | static void node_states_set_node(int node, struct memory_notify *arg) | |
773 | { | |
774 | if (arg->status_change_nid_normal >= 0) | |
775 | node_set_state(node, N_NORMAL_MEMORY); | |
776 | ||
6715ddf9 LJ |
777 | if (arg->status_change_nid_high >= 0) |
778 | node_set_state(node, N_HIGH_MEMORY); | |
779 | ||
780 | node_set_state(node, N_MEMORY); | |
d9713679 LJ |
781 | } |
782 | ||
f1dd2cd1 MH |
783 | static void __meminit resize_zone_range(struct zone *zone, unsigned long start_pfn, |
784 | unsigned long nr_pages) | |
785 | { | |
786 | unsigned long old_end_pfn = zone_end_pfn(zone); | |
787 | ||
788 | if (zone_is_empty(zone) || start_pfn < zone->zone_start_pfn) | |
789 | zone->zone_start_pfn = start_pfn; | |
790 | ||
791 | zone->spanned_pages = max(start_pfn + nr_pages, old_end_pfn) - zone->zone_start_pfn; | |
792 | } | |
793 | ||
794 | static void __meminit resize_pgdat_range(struct pglist_data *pgdat, unsigned long start_pfn, | |
795 | unsigned long nr_pages) | |
796 | { | |
797 | unsigned long old_end_pfn = pgdat_end_pfn(pgdat); | |
798 | ||
799 | if (!pgdat->node_spanned_pages || start_pfn < pgdat->node_start_pfn) | |
800 | pgdat->node_start_pfn = start_pfn; | |
801 | ||
802 | pgdat->node_spanned_pages = max(start_pfn + nr_pages, old_end_pfn) - pgdat->node_start_pfn; | |
803 | } | |
804 | ||
cdf72f25 | 805 | void __ref move_pfn_range_to_zone(struct zone *zone, |
f1dd2cd1 MH |
806 | unsigned long start_pfn, unsigned long nr_pages) |
807 | { | |
808 | struct pglist_data *pgdat = zone->zone_pgdat; | |
809 | int nid = pgdat->node_id; | |
810 | unsigned long flags; | |
df429ac0 | 811 | |
f1dd2cd1 MH |
812 | if (zone_is_empty(zone)) |
813 | init_currently_empty_zone(zone, start_pfn, nr_pages); | |
df429ac0 | 814 | |
f1dd2cd1 MH |
815 | clear_zone_contiguous(zone); |
816 | ||
817 | /* TODO Huh pgdat is irqsave while zone is not. It used to be like that before */ | |
818 | pgdat_resize_lock(pgdat, &flags); | |
819 | zone_span_writelock(zone); | |
820 | resize_zone_range(zone, start_pfn, nr_pages); | |
821 | zone_span_writeunlock(zone); | |
822 | resize_pgdat_range(pgdat, start_pfn, nr_pages); | |
823 | pgdat_resize_unlock(pgdat, &flags); | |
824 | ||
825 | /* | |
826 | * TODO now we have a visible range of pages which are not associated | |
827 | * with their zone properly. Not nice but set_pfnblock_flags_mask | |
828 | * expects the zone spans the pfn range. All the pages in the range | |
829 | * are reserved so nobody should be touching them so we should be safe | |
830 | */ | |
831 | memmap_init_zone(nr_pages, nid, zone_idx(zone), start_pfn, MEMMAP_HOTPLUG); | |
832 | ||
833 | set_zone_contiguous(zone); | |
834 | } | |
835 | ||
c246a213 MH |
836 | /* |
837 | * Returns a default kernel memory zone for the given pfn range. | |
838 | * If no kernel zone covers this pfn range it will automatically go | |
839 | * to the ZONE_NORMAL. | |
840 | */ | |
c6f03e29 | 841 | static struct zone *default_kernel_zone_for_pfn(int nid, unsigned long start_pfn, |
c246a213 MH |
842 | unsigned long nr_pages) |
843 | { | |
844 | struct pglist_data *pgdat = NODE_DATA(nid); | |
845 | int zid; | |
846 | ||
847 | for (zid = 0; zid <= ZONE_NORMAL; zid++) { | |
848 | struct zone *zone = &pgdat->node_zones[zid]; | |
849 | ||
850 | if (zone_intersects(zone, start_pfn, nr_pages)) | |
851 | return zone; | |
852 | } | |
853 | ||
854 | return &pgdat->node_zones[ZONE_NORMAL]; | |
855 | } | |
856 | ||
c6f03e29 MH |
857 | static inline struct zone *default_zone_for_pfn(int nid, unsigned long start_pfn, |
858 | unsigned long nr_pages) | |
e5e68930 | 859 | { |
c6f03e29 MH |
860 | struct zone *kernel_zone = default_kernel_zone_for_pfn(nid, start_pfn, |
861 | nr_pages); | |
862 | struct zone *movable_zone = &NODE_DATA(nid)->node_zones[ZONE_MOVABLE]; | |
863 | bool in_kernel = zone_intersects(kernel_zone, start_pfn, nr_pages); | |
864 | bool in_movable = zone_intersects(movable_zone, start_pfn, nr_pages); | |
e5e68930 MH |
865 | |
866 | /* | |
c6f03e29 MH |
867 | * We inherit the existing zone in a simple case where zones do not |
868 | * overlap in the given range | |
e5e68930 | 869 | */ |
c6f03e29 MH |
870 | if (in_kernel ^ in_movable) |
871 | return (in_kernel) ? kernel_zone : movable_zone; | |
9f123ab5 | 872 | |
c6f03e29 MH |
873 | /* |
874 | * If the range doesn't belong to any zone or two zones overlap in the | |
875 | * given range then we use movable zone only if movable_node is | |
876 | * enabled because we always online to a kernel zone by default. | |
877 | */ | |
878 | return movable_node_enabled ? movable_zone : kernel_zone; | |
9f123ab5 MH |
879 | } |
880 | ||
e5e68930 MH |
881 | struct zone * zone_for_pfn_range(int online_type, int nid, unsigned start_pfn, |
882 | unsigned long nr_pages) | |
f1dd2cd1 | 883 | { |
c6f03e29 MH |
884 | if (online_type == MMOP_ONLINE_KERNEL) |
885 | return default_kernel_zone_for_pfn(nid, start_pfn, nr_pages); | |
f1dd2cd1 | 886 | |
c6f03e29 MH |
887 | if (online_type == MMOP_ONLINE_MOVABLE) |
888 | return &NODE_DATA(nid)->node_zones[ZONE_MOVABLE]; | |
df429ac0 | 889 | |
c6f03e29 | 890 | return default_zone_for_pfn(nid, start_pfn, nr_pages); |
e5e68930 MH |
891 | } |
892 | ||
893 | /* | |
894 | * Associates the given pfn range with the given node and the zone appropriate | |
895 | * for the given online type. | |
896 | */ | |
897 | static struct zone * __meminit move_pfn_range(int online_type, int nid, | |
898 | unsigned long start_pfn, unsigned long nr_pages) | |
899 | { | |
900 | struct zone *zone; | |
901 | ||
902 | zone = zone_for_pfn_range(online_type, nid, start_pfn, nr_pages); | |
f1dd2cd1 MH |
903 | move_pfn_range_to_zone(zone, start_pfn, nr_pages); |
904 | return zone; | |
df429ac0 | 905 | } |
75884fb1 | 906 | |
b93e0f32 | 907 | /* Must be protected by mem_hotplug_begin() or a device_lock */ |
511c2aba | 908 | int __ref online_pages(unsigned long pfn, unsigned long nr_pages, int online_type) |
75884fb1 | 909 | { |
aa47228a | 910 | unsigned long flags; |
3947be19 DH |
911 | unsigned long onlined_pages = 0; |
912 | struct zone *zone; | |
6811378e | 913 | int need_zonelists_rebuild = 0; |
7b78d335 YG |
914 | int nid; |
915 | int ret; | |
916 | struct memory_notify arg; | |
917 | ||
f1dd2cd1 | 918 | nid = pfn_to_nid(pfn); |
f1dd2cd1 MH |
919 | /* associate pfn range with the zone */ |
920 | zone = move_pfn_range(online_type, nid, pfn, nr_pages); | |
921 | ||
7b78d335 YG |
922 | arg.start_pfn = pfn; |
923 | arg.nr_pages = nr_pages; | |
d9713679 | 924 | node_states_check_changes_online(nr_pages, zone, &arg); |
7b78d335 | 925 | |
7b78d335 YG |
926 | ret = memory_notify(MEM_GOING_ONLINE, &arg); |
927 | ret = notifier_to_errno(ret); | |
e33e33b4 CY |
928 | if (ret) |
929 | goto failed_addition; | |
930 | ||
6811378e YG |
931 | /* |
932 | * If this zone is not populated, then it is not in zonelist. | |
933 | * This means the page allocator ignores this zone. | |
934 | * So, zonelist must be updated after online. | |
935 | */ | |
6dcd73d7 | 936 | if (!populated_zone(zone)) { |
6811378e | 937 | need_zonelists_rebuild = 1; |
72675e13 | 938 | setup_zone_pageset(zone); |
6dcd73d7 | 939 | } |
6811378e | 940 | |
908eedc6 | 941 | ret = walk_system_ram_range(pfn, nr_pages, &onlined_pages, |
75884fb1 | 942 | online_pages_range); |
fd8a4221 | 943 | if (ret) { |
6dcd73d7 WC |
944 | if (need_zonelists_rebuild) |
945 | zone_pcp_reset(zone); | |
e33e33b4 | 946 | goto failed_addition; |
fd8a4221 GL |
947 | } |
948 | ||
3947be19 | 949 | zone->present_pages += onlined_pages; |
aa47228a CS |
950 | |
951 | pgdat_resize_lock(zone->zone_pgdat, &flags); | |
f2937be5 | 952 | zone->zone_pgdat->node_present_pages += onlined_pages; |
aa47228a CS |
953 | pgdat_resize_unlock(zone->zone_pgdat, &flags); |
954 | ||
08dff7b7 | 955 | if (onlined_pages) { |
e888ca35 | 956 | node_states_set_node(nid, &arg); |
08dff7b7 | 957 | if (need_zonelists_rebuild) |
72675e13 | 958 | build_all_zonelists(NULL); |
08dff7b7 JL |
959 | else |
960 | zone_pcp_update(zone); | |
961 | } | |
3947be19 | 962 | |
1b79acc9 KM |
963 | init_per_zone_wmark_min(); |
964 | ||
698b1b30 | 965 | if (onlined_pages) { |
e888ca35 | 966 | kswapd_run(nid); |
698b1b30 VB |
967 | kcompactd_run(nid); |
968 | } | |
61b13993 | 969 | |
1f522509 | 970 | vm_total_pages = nr_free_pagecache_pages(); |
2f7f24ec | 971 | |
2d1d43f6 | 972 | writeback_set_ratelimit(); |
7b78d335 YG |
973 | |
974 | if (onlined_pages) | |
975 | memory_notify(MEM_ONLINE, &arg); | |
30467e0b | 976 | return 0; |
e33e33b4 CY |
977 | |
978 | failed_addition: | |
979 | pr_debug("online_pages [mem %#010llx-%#010llx] failed\n", | |
980 | (unsigned long long) pfn << PAGE_SHIFT, | |
981 | (((unsigned long long) pfn + nr_pages) << PAGE_SHIFT) - 1); | |
982 | memory_notify(MEM_CANCEL_ONLINE, &arg); | |
983 | return ret; | |
3947be19 | 984 | } |
53947027 | 985 | #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ |
bc02af93 | 986 | |
0bd85420 TC |
987 | static void reset_node_present_pages(pg_data_t *pgdat) |
988 | { | |
989 | struct zone *z; | |
990 | ||
991 | for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++) | |
992 | z->present_pages = 0; | |
993 | ||
994 | pgdat->node_present_pages = 0; | |
995 | } | |
996 | ||
e1319331 HS |
997 | /* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */ |
998 | static pg_data_t __ref *hotadd_new_pgdat(int nid, u64 start) | |
9af3c2de YG |
999 | { |
1000 | struct pglist_data *pgdat; | |
1001 | unsigned long zones_size[MAX_NR_ZONES] = {0}; | |
1002 | unsigned long zholes_size[MAX_NR_ZONES] = {0}; | |
c8e861a5 | 1003 | unsigned long start_pfn = PFN_DOWN(start); |
9af3c2de | 1004 | |
a1e565aa TC |
1005 | pgdat = NODE_DATA(nid); |
1006 | if (!pgdat) { | |
1007 | pgdat = arch_alloc_nodedata(nid); | |
1008 | if (!pgdat) | |
1009 | return NULL; | |
9af3c2de | 1010 | |
a1e565aa | 1011 | arch_refresh_nodedata(nid, pgdat); |
b0dc3a34 | 1012 | } else { |
e716f2eb MG |
1013 | /* |
1014 | * Reset the nr_zones, order and classzone_idx before reuse. | |
1015 | * Note that kswapd will init kswapd_classzone_idx properly | |
1016 | * when it starts in the near future. | |
1017 | */ | |
b0dc3a34 | 1018 | pgdat->nr_zones = 0; |
38087d9b MG |
1019 | pgdat->kswapd_order = 0; |
1020 | pgdat->kswapd_classzone_idx = 0; | |
a1e565aa | 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); |
5830169f | 1027 | pgdat->per_cpu_nodestats = alloc_percpu(struct per_cpu_nodestat); |
9af3c2de | 1028 | |
959ecc48 KH |
1029 | /* |
1030 | * The node we allocated has no zone fallback lists. For avoiding | |
1031 | * to access not-initialized zonelist, build here. | |
1032 | */ | |
72675e13 | 1033 | build_all_zonelists(pgdat); |
959ecc48 | 1034 | |
f784a3f1 TC |
1035 | /* |
1036 | * zone->managed_pages is set to an approximate value in | |
1037 | * free_area_init_core(), which will cause | |
1038 | * /sys/device/system/node/nodeX/meminfo has wrong data. | |
1039 | * So reset it to 0 before any memory is onlined. | |
1040 | */ | |
1041 | reset_node_managed_pages(pgdat); | |
1042 | ||
0bd85420 TC |
1043 | /* |
1044 | * When memory is hot-added, all the memory is in offline state. So | |
1045 | * clear all zones' present_pages because they will be updated in | |
1046 | * online_pages() and offline_pages(). | |
1047 | */ | |
1048 | reset_node_present_pages(pgdat); | |
1049 | ||
9af3c2de YG |
1050 | return pgdat; |
1051 | } | |
1052 | ||
1053 | static void rollback_node_hotadd(int nid, pg_data_t *pgdat) | |
1054 | { | |
1055 | arch_refresh_nodedata(nid, NULL); | |
5830169f | 1056 | free_percpu(pgdat->per_cpu_nodestats); |
9af3c2de YG |
1057 | arch_free_nodedata(pgdat); |
1058 | return; | |
1059 | } | |
1060 | ||
0a547039 | 1061 | |
01b0f197 TK |
1062 | /** |
1063 | * try_online_node - online a node if offlined | |
1064 | * | |
cf23422b | 1065 | * called by cpu_up() to online a node without onlined memory. |
1066 | */ | |
01b0f197 | 1067 | int try_online_node(int nid) |
cf23422b | 1068 | { |
1069 | pg_data_t *pgdat; | |
1070 | int ret; | |
1071 | ||
01b0f197 TK |
1072 | if (node_online(nid)) |
1073 | return 0; | |
1074 | ||
bfc8c901 | 1075 | mem_hotplug_begin(); |
cf23422b | 1076 | pgdat = hotadd_new_pgdat(nid, 0); |
7553e8f2 | 1077 | if (!pgdat) { |
01b0f197 | 1078 | pr_err("Cannot online node %d due to NULL pgdat\n", nid); |
cf23422b | 1079 | ret = -ENOMEM; |
1080 | goto out; | |
1081 | } | |
1082 | node_set_online(nid); | |
1083 | ret = register_one_node(nid); | |
1084 | BUG_ON(ret); | |
cf23422b | 1085 | out: |
bfc8c901 | 1086 | mem_hotplug_done(); |
cf23422b | 1087 | return ret; |
1088 | } | |
1089 | ||
27356f54 TK |
1090 | static int check_hotplug_memory_range(u64 start, u64 size) |
1091 | { | |
c8e861a5 | 1092 | u64 start_pfn = PFN_DOWN(start); |
27356f54 TK |
1093 | u64 nr_pages = size >> PAGE_SHIFT; |
1094 | ||
1095 | /* Memory range must be aligned with section */ | |
1096 | if ((start_pfn & ~PAGE_SECTION_MASK) || | |
1097 | (nr_pages % PAGES_PER_SECTION) || (!nr_pages)) { | |
1098 | pr_err("Section-unaligned hotplug range: start 0x%llx, size 0x%llx\n", | |
1099 | (unsigned long long)start, | |
1100 | (unsigned long long)size); | |
1101 | return -EINVAL; | |
1102 | } | |
1103 | ||
1104 | return 0; | |
1105 | } | |
1106 | ||
31bc3858 VK |
1107 | static int online_memory_block(struct memory_block *mem, void *arg) |
1108 | { | |
dc18d706 | 1109 | return device_online(&mem->dev); |
31bc3858 VK |
1110 | } |
1111 | ||
31168481 | 1112 | /* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */ |
31bc3858 | 1113 | int __ref add_memory_resource(int nid, struct resource *res, bool online) |
bc02af93 | 1114 | { |
62cedb9f | 1115 | u64 start, size; |
9af3c2de | 1116 | pg_data_t *pgdat = NULL; |
a1e565aa TC |
1117 | bool new_pgdat; |
1118 | bool new_node; | |
bc02af93 YG |
1119 | int ret; |
1120 | ||
62cedb9f DV |
1121 | start = res->start; |
1122 | size = resource_size(res); | |
1123 | ||
27356f54 TK |
1124 | ret = check_hotplug_memory_range(start, size); |
1125 | if (ret) | |
1126 | return ret; | |
1127 | ||
a1e565aa TC |
1128 | { /* Stupid hack to suppress address-never-null warning */ |
1129 | void *p = NODE_DATA(nid); | |
1130 | new_pgdat = !p; | |
1131 | } | |
ac13c462 | 1132 | |
bfc8c901 | 1133 | mem_hotplug_begin(); |
ac13c462 | 1134 | |
7f36e3e5 TC |
1135 | /* |
1136 | * Add new range to memblock so that when hotadd_new_pgdat() is called | |
1137 | * to allocate new pgdat, get_pfn_range_for_nid() will be able to find | |
1138 | * this new range and calculate total pages correctly. The range will | |
1139 | * be removed at hot-remove time. | |
1140 | */ | |
1141 | memblock_add_node(start, size, nid); | |
1142 | ||
a1e565aa TC |
1143 | new_node = !node_online(nid); |
1144 | if (new_node) { | |
9af3c2de | 1145 | pgdat = hotadd_new_pgdat(nid, start); |
6ad696d2 | 1146 | ret = -ENOMEM; |
9af3c2de | 1147 | if (!pgdat) |
41b9e2d7 | 1148 | goto error; |
9af3c2de YG |
1149 | } |
1150 | ||
bc02af93 | 1151 | /* call arch's memory hotadd */ |
3d79a728 | 1152 | ret = arch_add_memory(nid, start, size, true); |
bc02af93 | 1153 | |
9af3c2de YG |
1154 | if (ret < 0) |
1155 | goto error; | |
1156 | ||
0fc44159 | 1157 | /* we online node here. we can't roll back from here. */ |
9af3c2de YG |
1158 | node_set_online(nid); |
1159 | ||
a1e565aa | 1160 | if (new_node) { |
9037a993 MH |
1161 | unsigned long start_pfn = start >> PAGE_SHIFT; |
1162 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
1163 | ||
1164 | ret = __register_one_node(nid); | |
1165 | if (ret) | |
1166 | goto register_fail; | |
1167 | ||
1168 | /* | |
1169 | * link memory sections under this node. This is already | |
1170 | * done when creatig memory section in register_new_memory | |
1171 | * but that depends to have the node registered so offline | |
1172 | * nodes have to go through register_node. | |
1173 | * TODO clean up this mess. | |
1174 | */ | |
1175 | ret = link_mem_sections(nid, start_pfn, nr_pages); | |
1176 | register_fail: | |
0fc44159 YG |
1177 | /* |
1178 | * If sysfs file of new node can't create, cpu on the node | |
1179 | * can't be hot-added. There is no rollback way now. | |
1180 | * So, check by BUG_ON() to catch it reluctantly.. | |
1181 | */ | |
1182 | BUG_ON(ret); | |
1183 | } | |
1184 | ||
d96ae530 | 1185 | /* create new memmap entry */ |
1186 | firmware_map_add_hotplug(start, start + size, "System RAM"); | |
1187 | ||
31bc3858 VK |
1188 | /* online pages if requested */ |
1189 | if (online) | |
1190 | walk_memory_range(PFN_DOWN(start), PFN_UP(start + size - 1), | |
1191 | NULL, online_memory_block); | |
1192 | ||
6ad696d2 AK |
1193 | goto out; |
1194 | ||
9af3c2de YG |
1195 | error: |
1196 | /* rollback pgdat allocation and others */ | |
dbac61a3 | 1197 | if (new_pgdat && pgdat) |
9af3c2de | 1198 | rollback_node_hotadd(nid, pgdat); |
7f36e3e5 | 1199 | memblock_remove(start, size); |
9af3c2de | 1200 | |
6ad696d2 | 1201 | out: |
bfc8c901 | 1202 | mem_hotplug_done(); |
bc02af93 YG |
1203 | return ret; |
1204 | } | |
62cedb9f DV |
1205 | EXPORT_SYMBOL_GPL(add_memory_resource); |
1206 | ||
1207 | int __ref add_memory(int nid, u64 start, u64 size) | |
1208 | { | |
1209 | struct resource *res; | |
1210 | int ret; | |
1211 | ||
1212 | res = register_memory_resource(start, size); | |
6f754ba4 VK |
1213 | if (IS_ERR(res)) |
1214 | return PTR_ERR(res); | |
62cedb9f | 1215 | |
31bc3858 | 1216 | ret = add_memory_resource(nid, res, memhp_auto_online); |
62cedb9f DV |
1217 | if (ret < 0) |
1218 | release_memory_resource(res); | |
1219 | return ret; | |
1220 | } | |
bc02af93 | 1221 | EXPORT_SYMBOL_GPL(add_memory); |
0c0e6195 KH |
1222 | |
1223 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
5c755e9f BP |
1224 | /* |
1225 | * A free page on the buddy free lists (not the per-cpu lists) has PageBuddy | |
1226 | * set and the size of the free page is given by page_order(). Using this, | |
1227 | * the function determines if the pageblock contains only free pages. | |
1228 | * Due to buddy contraints, a free page at least the size of a pageblock will | |
1229 | * be located at the start of the pageblock | |
1230 | */ | |
1231 | static inline int pageblock_free(struct page *page) | |
1232 | { | |
1233 | return PageBuddy(page) && page_order(page) >= pageblock_order; | |
1234 | } | |
1235 | ||
1236 | /* Return the start of the next active pageblock after a given page */ | |
1237 | static struct page *next_active_pageblock(struct page *page) | |
1238 | { | |
5c755e9f BP |
1239 | /* Ensure the starting page is pageblock-aligned */ |
1240 | BUG_ON(page_to_pfn(page) & (pageblock_nr_pages - 1)); | |
1241 | ||
5c755e9f | 1242 | /* If the entire pageblock is free, move to the end of free page */ |
0dcc48c1 KH |
1243 | if (pageblock_free(page)) { |
1244 | int order; | |
1245 | /* be careful. we don't have locks, page_order can be changed.*/ | |
1246 | order = page_order(page); | |
1247 | if ((order < MAX_ORDER) && (order >= pageblock_order)) | |
1248 | return page + (1 << order); | |
1249 | } | |
5c755e9f | 1250 | |
0dcc48c1 | 1251 | return page + pageblock_nr_pages; |
5c755e9f BP |
1252 | } |
1253 | ||
1254 | /* Checks if this range of memory is likely to be hot-removable. */ | |
c98940f6 | 1255 | bool is_mem_section_removable(unsigned long start_pfn, unsigned long nr_pages) |
5c755e9f | 1256 | { |
5c755e9f BP |
1257 | struct page *page = pfn_to_page(start_pfn); |
1258 | struct page *end_page = page + nr_pages; | |
1259 | ||
1260 | /* Check the starting page of each pageblock within the range */ | |
1261 | for (; page < end_page; page = next_active_pageblock(page)) { | |
49ac8255 | 1262 | if (!is_pageblock_removable_nolock(page)) |
c98940f6 | 1263 | return false; |
49ac8255 | 1264 | cond_resched(); |
5c755e9f BP |
1265 | } |
1266 | ||
1267 | /* All pageblocks in the memory block are likely to be hot-removable */ | |
c98940f6 | 1268 | return true; |
5c755e9f BP |
1269 | } |
1270 | ||
0c0e6195 | 1271 | /* |
deb88a2a | 1272 | * Confirm all pages in a range [start, end) belong to the same zone. |
a96dfddb | 1273 | * When true, return its valid [start, end). |
0c0e6195 | 1274 | */ |
a96dfddb TK |
1275 | int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn, |
1276 | unsigned long *valid_start, unsigned long *valid_end) | |
0c0e6195 | 1277 | { |
5f0f2887 | 1278 | unsigned long pfn, sec_end_pfn; |
a96dfddb | 1279 | unsigned long start, end; |
0c0e6195 KH |
1280 | struct zone *zone = NULL; |
1281 | struct page *page; | |
1282 | int i; | |
deb88a2a | 1283 | for (pfn = start_pfn, sec_end_pfn = SECTION_ALIGN_UP(start_pfn + 1); |
0c0e6195 | 1284 | pfn < end_pfn; |
deb88a2a | 1285 | pfn = sec_end_pfn, sec_end_pfn += PAGES_PER_SECTION) { |
5f0f2887 AB |
1286 | /* Make sure the memory section is present first */ |
1287 | if (!present_section_nr(pfn_to_section_nr(pfn))) | |
0c0e6195 | 1288 | continue; |
5f0f2887 AB |
1289 | for (; pfn < sec_end_pfn && pfn < end_pfn; |
1290 | pfn += MAX_ORDER_NR_PAGES) { | |
1291 | i = 0; | |
1292 | /* This is just a CONFIG_HOLES_IN_ZONE check.*/ | |
1293 | while ((i < MAX_ORDER_NR_PAGES) && | |
1294 | !pfn_valid_within(pfn + i)) | |
1295 | i++; | |
d6d8c8a4 | 1296 | if (i == MAX_ORDER_NR_PAGES || pfn + i >= end_pfn) |
5f0f2887 AB |
1297 | continue; |
1298 | page = pfn_to_page(pfn + i); | |
1299 | if (zone && page_zone(page) != zone) | |
1300 | return 0; | |
a96dfddb TK |
1301 | if (!zone) |
1302 | start = pfn + i; | |
5f0f2887 | 1303 | zone = page_zone(page); |
a96dfddb | 1304 | end = pfn + MAX_ORDER_NR_PAGES; |
5f0f2887 | 1305 | } |
0c0e6195 | 1306 | } |
deb88a2a | 1307 | |
a96dfddb TK |
1308 | if (zone) { |
1309 | *valid_start = start; | |
d6d8c8a4 | 1310 | *valid_end = min(end, end_pfn); |
deb88a2a | 1311 | return 1; |
a96dfddb | 1312 | } else { |
deb88a2a | 1313 | return 0; |
a96dfddb | 1314 | } |
0c0e6195 KH |
1315 | } |
1316 | ||
1317 | /* | |
0efadf48 YX |
1318 | * Scan pfn range [start,end) to find movable/migratable pages (LRU pages, |
1319 | * non-lru movable pages and hugepages). We scan pfn because it's much | |
1320 | * easier than scanning over linked list. This function returns the pfn | |
1321 | * of the first found movable page if it's found, otherwise 0. | |
0c0e6195 | 1322 | */ |
c8721bbb | 1323 | static unsigned long scan_movable_pages(unsigned long start, unsigned long end) |
0c0e6195 KH |
1324 | { |
1325 | unsigned long pfn; | |
1326 | struct page *page; | |
1327 | for (pfn = start; pfn < end; pfn++) { | |
1328 | if (pfn_valid(pfn)) { | |
1329 | page = pfn_to_page(pfn); | |
1330 | if (PageLRU(page)) | |
1331 | return pfn; | |
0efadf48 YX |
1332 | if (__PageMovable(page)) |
1333 | return pfn; | |
c8721bbb | 1334 | if (PageHuge(page)) { |
7e1f049e | 1335 | if (page_huge_active(page)) |
c8721bbb NH |
1336 | return pfn; |
1337 | else | |
1338 | pfn = round_up(pfn + 1, | |
1339 | 1 << compound_order(page)) - 1; | |
1340 | } | |
0c0e6195 KH |
1341 | } |
1342 | } | |
1343 | return 0; | |
1344 | } | |
1345 | ||
394e31d2 XQ |
1346 | static struct page *new_node_page(struct page *page, unsigned long private, |
1347 | int **result) | |
1348 | { | |
394e31d2 | 1349 | int nid = page_to_nid(page); |
231e97e2 | 1350 | nodemask_t nmask = node_states[N_MEMORY]; |
7f252f27 MH |
1351 | |
1352 | /* | |
1353 | * try to allocate from a different node but reuse this node if there | |
1354 | * are no other online nodes to be used (e.g. we are offlining a part | |
1355 | * of the only existing node) | |
1356 | */ | |
1357 | node_clear(nid, nmask); | |
1358 | if (nodes_empty(nmask)) | |
1359 | node_set(nid, nmask); | |
394e31d2 | 1360 | |
8b913238 | 1361 | return new_page_nodemask(page, nid, &nmask); |
394e31d2 XQ |
1362 | } |
1363 | ||
0c0e6195 KH |
1364 | #define NR_OFFLINE_AT_ONCE_PAGES (256) |
1365 | static int | |
1366 | do_migrate_range(unsigned long start_pfn, unsigned long end_pfn) | |
1367 | { | |
1368 | unsigned long pfn; | |
1369 | struct page *page; | |
1370 | int move_pages = NR_OFFLINE_AT_ONCE_PAGES; | |
1371 | int not_managed = 0; | |
1372 | int ret = 0; | |
1373 | LIST_HEAD(source); | |
1374 | ||
1375 | for (pfn = start_pfn; pfn < end_pfn && move_pages > 0; pfn++) { | |
1376 | if (!pfn_valid(pfn)) | |
1377 | continue; | |
1378 | page = pfn_to_page(pfn); | |
c8721bbb NH |
1379 | |
1380 | if (PageHuge(page)) { | |
1381 | struct page *head = compound_head(page); | |
1382 | pfn = page_to_pfn(head) + (1<<compound_order(head)) - 1; | |
1383 | if (compound_order(head) > PFN_SECTION_SHIFT) { | |
1384 | ret = -EBUSY; | |
1385 | break; | |
1386 | } | |
1387 | if (isolate_huge_page(page, &source)) | |
1388 | move_pages -= 1 << compound_order(head); | |
1389 | continue; | |
8135d892 NH |
1390 | } else if (thp_migration_supported() && PageTransHuge(page)) |
1391 | pfn = page_to_pfn(compound_head(page)) | |
1392 | + hpage_nr_pages(page) - 1; | |
c8721bbb | 1393 | |
700c2a46 | 1394 | if (!get_page_unless_zero(page)) |
0c0e6195 KH |
1395 | continue; |
1396 | /* | |
0efadf48 YX |
1397 | * We can skip free pages. And we can deal with pages on |
1398 | * LRU and non-lru movable pages. | |
0c0e6195 | 1399 | */ |
0efadf48 YX |
1400 | if (PageLRU(page)) |
1401 | ret = isolate_lru_page(page); | |
1402 | else | |
1403 | ret = isolate_movable_page(page, ISOLATE_UNEVICTABLE); | |
0c0e6195 | 1404 | if (!ret) { /* Success */ |
700c2a46 | 1405 | put_page(page); |
62695a84 | 1406 | list_add_tail(&page->lru, &source); |
0c0e6195 | 1407 | move_pages--; |
0efadf48 YX |
1408 | if (!__PageMovable(page)) |
1409 | inc_node_page_state(page, NR_ISOLATED_ANON + | |
1410 | page_is_file_cache(page)); | |
6d9c285a | 1411 | |
0c0e6195 | 1412 | } else { |
0c0e6195 | 1413 | #ifdef CONFIG_DEBUG_VM |
0efadf48 YX |
1414 | pr_alert("failed to isolate pfn %lx\n", pfn); |
1415 | dump_page(page, "isolation failed"); | |
0c0e6195 | 1416 | #endif |
700c2a46 | 1417 | put_page(page); |
25985edc | 1418 | /* Because we don't have big zone->lock. we should |
809c4449 BL |
1419 | check this again here. */ |
1420 | if (page_count(page)) { | |
1421 | not_managed++; | |
f3ab2636 | 1422 | ret = -EBUSY; |
809c4449 BL |
1423 | break; |
1424 | } | |
0c0e6195 KH |
1425 | } |
1426 | } | |
f3ab2636 BL |
1427 | if (!list_empty(&source)) { |
1428 | if (not_managed) { | |
c8721bbb | 1429 | putback_movable_pages(&source); |
f3ab2636 BL |
1430 | goto out; |
1431 | } | |
74c08f98 | 1432 | |
394e31d2 XQ |
1433 | /* Allocate a new page from the nearest neighbor node */ |
1434 | ret = migrate_pages(&source, new_node_page, NULL, 0, | |
9c620e2b | 1435 | MIGRATE_SYNC, MR_MEMORY_HOTPLUG); |
f3ab2636 | 1436 | if (ret) |
c8721bbb | 1437 | putback_movable_pages(&source); |
0c0e6195 | 1438 | } |
0c0e6195 KH |
1439 | out: |
1440 | return ret; | |
1441 | } | |
1442 | ||
1443 | /* | |
1444 | * remove from free_area[] and mark all as Reserved. | |
1445 | */ | |
1446 | static int | |
1447 | offline_isolated_pages_cb(unsigned long start, unsigned long nr_pages, | |
1448 | void *data) | |
1449 | { | |
1450 | __offline_isolated_pages(start, start + nr_pages); | |
1451 | return 0; | |
1452 | } | |
1453 | ||
1454 | static void | |
1455 | offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn) | |
1456 | { | |
908eedc6 | 1457 | walk_system_ram_range(start_pfn, end_pfn - start_pfn, NULL, |
0c0e6195 KH |
1458 | offline_isolated_pages_cb); |
1459 | } | |
1460 | ||
1461 | /* | |
1462 | * Check all pages in range, recoreded as memory resource, are isolated. | |
1463 | */ | |
1464 | static int | |
1465 | check_pages_isolated_cb(unsigned long start_pfn, unsigned long nr_pages, | |
1466 | void *data) | |
1467 | { | |
1468 | int ret; | |
1469 | long offlined = *(long *)data; | |
b023f468 | 1470 | ret = test_pages_isolated(start_pfn, start_pfn + nr_pages, true); |
0c0e6195 KH |
1471 | offlined = nr_pages; |
1472 | if (!ret) | |
1473 | *(long *)data += offlined; | |
1474 | return ret; | |
1475 | } | |
1476 | ||
1477 | static long | |
1478 | check_pages_isolated(unsigned long start_pfn, unsigned long end_pfn) | |
1479 | { | |
1480 | long offlined = 0; | |
1481 | int ret; | |
1482 | ||
908eedc6 | 1483 | ret = walk_system_ram_range(start_pfn, end_pfn - start_pfn, &offlined, |
0c0e6195 KH |
1484 | check_pages_isolated_cb); |
1485 | if (ret < 0) | |
1486 | offlined = (long)ret; | |
1487 | return offlined; | |
1488 | } | |
1489 | ||
c5320926 TC |
1490 | static int __init cmdline_parse_movable_node(char *p) |
1491 | { | |
4932381e | 1492 | #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP |
55ac590c | 1493 | movable_node_enabled = true; |
4932381e MH |
1494 | #else |
1495 | pr_warn("movable_node parameter depends on CONFIG_HAVE_MEMBLOCK_NODE_MAP to work properly\n"); | |
1496 | #endif | |
c5320926 TC |
1497 | return 0; |
1498 | } | |
1499 | early_param("movable_node", cmdline_parse_movable_node); | |
1500 | ||
d9713679 LJ |
1501 | /* check which state of node_states will be changed when offline memory */ |
1502 | static void node_states_check_changes_offline(unsigned long nr_pages, | |
1503 | struct zone *zone, struct memory_notify *arg) | |
1504 | { | |
1505 | struct pglist_data *pgdat = zone->zone_pgdat; | |
1506 | unsigned long present_pages = 0; | |
1507 | enum zone_type zt, zone_last = ZONE_NORMAL; | |
1508 | ||
1509 | /* | |
6715ddf9 LJ |
1510 | * If we have HIGHMEM or movable node, node_states[N_NORMAL_MEMORY] |
1511 | * contains nodes which have zones of 0...ZONE_NORMAL, | |
1512 | * set zone_last to ZONE_NORMAL. | |
d9713679 | 1513 | * |
6715ddf9 LJ |
1514 | * If we don't have HIGHMEM nor movable node, |
1515 | * node_states[N_NORMAL_MEMORY] contains nodes which have zones of | |
1516 | * 0...ZONE_MOVABLE, set zone_last to ZONE_MOVABLE. | |
d9713679 | 1517 | */ |
6715ddf9 | 1518 | if (N_MEMORY == N_NORMAL_MEMORY) |
d9713679 LJ |
1519 | zone_last = ZONE_MOVABLE; |
1520 | ||
1521 | /* | |
1522 | * check whether node_states[N_NORMAL_MEMORY] will be changed. | |
1523 | * If the memory to be offline is in a zone of 0...zone_last, | |
1524 | * and it is the last present memory, 0...zone_last will | |
1525 | * become empty after offline , thus we can determind we will | |
1526 | * need to clear the node from node_states[N_NORMAL_MEMORY]. | |
1527 | */ | |
1528 | for (zt = 0; zt <= zone_last; zt++) | |
1529 | present_pages += pgdat->node_zones[zt].present_pages; | |
1530 | if (zone_idx(zone) <= zone_last && nr_pages >= present_pages) | |
1531 | arg->status_change_nid_normal = zone_to_nid(zone); | |
1532 | else | |
1533 | arg->status_change_nid_normal = -1; | |
1534 | ||
6715ddf9 LJ |
1535 | #ifdef CONFIG_HIGHMEM |
1536 | /* | |
1537 | * If we have movable node, node_states[N_HIGH_MEMORY] | |
1538 | * contains nodes which have zones of 0...ZONE_HIGHMEM, | |
1539 | * set zone_last to ZONE_HIGHMEM. | |
1540 | * | |
1541 | * If we don't have movable node, node_states[N_NORMAL_MEMORY] | |
1542 | * contains nodes which have zones of 0...ZONE_MOVABLE, | |
1543 | * set zone_last to ZONE_MOVABLE. | |
1544 | */ | |
1545 | zone_last = ZONE_HIGHMEM; | |
1546 | if (N_MEMORY == N_HIGH_MEMORY) | |
1547 | zone_last = ZONE_MOVABLE; | |
1548 | ||
1549 | for (; zt <= zone_last; zt++) | |
1550 | present_pages += pgdat->node_zones[zt].present_pages; | |
1551 | if (zone_idx(zone) <= zone_last && nr_pages >= present_pages) | |
1552 | arg->status_change_nid_high = zone_to_nid(zone); | |
1553 | else | |
1554 | arg->status_change_nid_high = -1; | |
1555 | #else | |
1556 | arg->status_change_nid_high = arg->status_change_nid_normal; | |
1557 | #endif | |
1558 | ||
d9713679 LJ |
1559 | /* |
1560 | * node_states[N_HIGH_MEMORY] contains nodes which have 0...ZONE_MOVABLE | |
1561 | */ | |
1562 | zone_last = ZONE_MOVABLE; | |
1563 | ||
1564 | /* | |
1565 | * check whether node_states[N_HIGH_MEMORY] will be changed | |
1566 | * If we try to offline the last present @nr_pages from the node, | |
1567 | * we can determind we will need to clear the node from | |
1568 | * node_states[N_HIGH_MEMORY]. | |
1569 | */ | |
1570 | for (; zt <= zone_last; zt++) | |
1571 | present_pages += pgdat->node_zones[zt].present_pages; | |
1572 | if (nr_pages >= present_pages) | |
1573 | arg->status_change_nid = zone_to_nid(zone); | |
1574 | else | |
1575 | arg->status_change_nid = -1; | |
1576 | } | |
1577 | ||
1578 | static void node_states_clear_node(int node, struct memory_notify *arg) | |
1579 | { | |
1580 | if (arg->status_change_nid_normal >= 0) | |
1581 | node_clear_state(node, N_NORMAL_MEMORY); | |
1582 | ||
6715ddf9 LJ |
1583 | if ((N_MEMORY != N_NORMAL_MEMORY) && |
1584 | (arg->status_change_nid_high >= 0)) | |
d9713679 | 1585 | node_clear_state(node, N_HIGH_MEMORY); |
6715ddf9 LJ |
1586 | |
1587 | if ((N_MEMORY != N_HIGH_MEMORY) && | |
1588 | (arg->status_change_nid >= 0)) | |
1589 | node_clear_state(node, N_MEMORY); | |
d9713679 LJ |
1590 | } |
1591 | ||
a16cee10 | 1592 | static int __ref __offline_pages(unsigned long start_pfn, |
ecde0f3e | 1593 | unsigned long end_pfn) |
0c0e6195 | 1594 | { |
ecde0f3e | 1595 | unsigned long pfn, nr_pages; |
0c0e6195 | 1596 | long offlined_pages; |
72b39cfc | 1597 | int ret, node; |
d702909f | 1598 | unsigned long flags; |
a96dfddb | 1599 | unsigned long valid_start, valid_end; |
0c0e6195 | 1600 | struct zone *zone; |
7b78d335 | 1601 | struct memory_notify arg; |
0c0e6195 | 1602 | |
0c0e6195 KH |
1603 | /* at least, alignment against pageblock is necessary */ |
1604 | if (!IS_ALIGNED(start_pfn, pageblock_nr_pages)) | |
1605 | return -EINVAL; | |
1606 | if (!IS_ALIGNED(end_pfn, pageblock_nr_pages)) | |
1607 | return -EINVAL; | |
1608 | /* This makes hotplug much easier...and readable. | |
1609 | we assume this for now. .*/ | |
a96dfddb | 1610 | if (!test_pages_in_a_zone(start_pfn, end_pfn, &valid_start, &valid_end)) |
0c0e6195 | 1611 | return -EINVAL; |
7b78d335 | 1612 | |
a96dfddb | 1613 | zone = page_zone(pfn_to_page(valid_start)); |
7b78d335 YG |
1614 | node = zone_to_nid(zone); |
1615 | nr_pages = end_pfn - start_pfn; | |
1616 | ||
0c0e6195 | 1617 | /* set above range as isolated */ |
b023f468 WC |
1618 | ret = start_isolate_page_range(start_pfn, end_pfn, |
1619 | MIGRATE_MOVABLE, true); | |
0c0e6195 | 1620 | if (ret) |
30467e0b | 1621 | return ret; |
7b78d335 YG |
1622 | |
1623 | arg.start_pfn = start_pfn; | |
1624 | arg.nr_pages = nr_pages; | |
d9713679 | 1625 | node_states_check_changes_offline(nr_pages, zone, &arg); |
7b78d335 YG |
1626 | |
1627 | ret = memory_notify(MEM_GOING_OFFLINE, &arg); | |
1628 | ret = notifier_to_errno(ret); | |
1629 | if (ret) | |
1630 | goto failed_removal; | |
1631 | ||
0c0e6195 | 1632 | pfn = start_pfn; |
0c0e6195 KH |
1633 | repeat: |
1634 | /* start memory hot removal */ | |
0c0e6195 KH |
1635 | ret = -EINTR; |
1636 | if (signal_pending(current)) | |
1637 | goto failed_removal; | |
72b39cfc MH |
1638 | |
1639 | cond_resched(); | |
1640 | lru_add_drain_all_cpuslocked(); | |
1641 | drain_all_pages(zone); | |
0c0e6195 | 1642 | |
c8721bbb NH |
1643 | pfn = scan_movable_pages(start_pfn, end_pfn); |
1644 | if (pfn) { /* We have movable pages */ | |
0c0e6195 | 1645 | ret = do_migrate_range(pfn, end_pfn); |
72b39cfc | 1646 | goto repeat; |
0c0e6195 | 1647 | } |
72b39cfc | 1648 | |
c8721bbb NH |
1649 | /* |
1650 | * dissolve free hugepages in the memory block before doing offlining | |
1651 | * actually in order to make hugetlbfs's object counting consistent. | |
1652 | */ | |
082d5b6b GS |
1653 | ret = dissolve_free_huge_pages(start_pfn, end_pfn); |
1654 | if (ret) | |
1655 | goto failed_removal; | |
0c0e6195 KH |
1656 | /* check again */ |
1657 | offlined_pages = check_pages_isolated(start_pfn, end_pfn); | |
72b39cfc MH |
1658 | if (offlined_pages < 0) |
1659 | goto repeat; | |
e33e33b4 | 1660 | pr_info("Offlined Pages %ld\n", offlined_pages); |
b3834be5 | 1661 | /* Ok, all of our target is isolated. |
0c0e6195 KH |
1662 | We cannot do rollback at this point. */ |
1663 | offline_isolated_pages(start_pfn, end_pfn); | |
dbc0e4ce | 1664 | /* reset pagetype flags and makes migrate type to be MOVABLE */ |
0815f3d8 | 1665 | undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE); |
0c0e6195 | 1666 | /* removal success */ |
3dcc0571 | 1667 | adjust_managed_page_count(pfn_to_page(start_pfn), -offlined_pages); |
0c0e6195 | 1668 | zone->present_pages -= offlined_pages; |
d702909f CS |
1669 | |
1670 | pgdat_resize_lock(zone->zone_pgdat, &flags); | |
0c0e6195 | 1671 | zone->zone_pgdat->node_present_pages -= offlined_pages; |
d702909f | 1672 | pgdat_resize_unlock(zone->zone_pgdat, &flags); |
7b78d335 | 1673 | |
1b79acc9 KM |
1674 | init_per_zone_wmark_min(); |
1675 | ||
1e8537ba | 1676 | if (!populated_zone(zone)) { |
340175b7 | 1677 | zone_pcp_reset(zone); |
72675e13 | 1678 | build_all_zonelists(NULL); |
1e8537ba XQ |
1679 | } else |
1680 | zone_pcp_update(zone); | |
340175b7 | 1681 | |
d9713679 | 1682 | node_states_clear_node(node, &arg); |
698b1b30 | 1683 | if (arg.status_change_nid >= 0) { |
8fe23e05 | 1684 | kswapd_stop(node); |
698b1b30 VB |
1685 | kcompactd_stop(node); |
1686 | } | |
bce7394a | 1687 | |
0c0e6195 KH |
1688 | vm_total_pages = nr_free_pagecache_pages(); |
1689 | writeback_set_ratelimit(); | |
7b78d335 YG |
1690 | |
1691 | memory_notify(MEM_OFFLINE, &arg); | |
0c0e6195 KH |
1692 | return 0; |
1693 | ||
1694 | failed_removal: | |
e33e33b4 CY |
1695 | pr_debug("memory offlining [mem %#010llx-%#010llx] failed\n", |
1696 | (unsigned long long) start_pfn << PAGE_SHIFT, | |
1697 | ((unsigned long long) end_pfn << PAGE_SHIFT) - 1); | |
7b78d335 | 1698 | memory_notify(MEM_CANCEL_OFFLINE, &arg); |
0c0e6195 | 1699 | /* pushback to free area */ |
0815f3d8 | 1700 | undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE); |
0c0e6195 KH |
1701 | return ret; |
1702 | } | |
71088785 | 1703 | |
b93e0f32 | 1704 | /* Must be protected by mem_hotplug_begin() or a device_lock */ |
a16cee10 WC |
1705 | int offline_pages(unsigned long start_pfn, unsigned long nr_pages) |
1706 | { | |
ecde0f3e | 1707 | return __offline_pages(start_pfn, start_pfn + nr_pages); |
a16cee10 | 1708 | } |
e2ff3940 | 1709 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
a16cee10 | 1710 | |
bbc76be6 WC |
1711 | /** |
1712 | * walk_memory_range - walks through all mem sections in [start_pfn, end_pfn) | |
1713 | * @start_pfn: start pfn of the memory range | |
e05c4bbf | 1714 | * @end_pfn: end pfn of the memory range |
bbc76be6 WC |
1715 | * @arg: argument passed to func |
1716 | * @func: callback for each memory section walked | |
1717 | * | |
1718 | * This function walks through all present mem sections in range | |
1719 | * [start_pfn, end_pfn) and call func on each mem section. | |
1720 | * | |
1721 | * Returns the return value of func. | |
1722 | */ | |
e2ff3940 | 1723 | int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn, |
bbc76be6 | 1724 | void *arg, int (*func)(struct memory_block *, void *)) |
71088785 | 1725 | { |
e90bdb7f WC |
1726 | struct memory_block *mem = NULL; |
1727 | struct mem_section *section; | |
e90bdb7f WC |
1728 | unsigned long pfn, section_nr; |
1729 | int ret; | |
e90bdb7f WC |
1730 | |
1731 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { | |
1732 | section_nr = pfn_to_section_nr(pfn); | |
1733 | if (!present_section_nr(section_nr)) | |
1734 | continue; | |
1735 | ||
1736 | section = __nr_to_section(section_nr); | |
1737 | /* same memblock? */ | |
1738 | if (mem) | |
1739 | if ((section_nr >= mem->start_section_nr) && | |
1740 | (section_nr <= mem->end_section_nr)) | |
1741 | continue; | |
1742 | ||
1743 | mem = find_memory_block_hinted(section, mem); | |
1744 | if (!mem) | |
1745 | continue; | |
1746 | ||
bbc76be6 | 1747 | ret = func(mem, arg); |
e90bdb7f | 1748 | if (ret) { |
bbc76be6 WC |
1749 | kobject_put(&mem->dev.kobj); |
1750 | return ret; | |
e90bdb7f WC |
1751 | } |
1752 | } | |
1753 | ||
1754 | if (mem) | |
1755 | kobject_put(&mem->dev.kobj); | |
1756 | ||
bbc76be6 WC |
1757 | return 0; |
1758 | } | |
1759 | ||
e2ff3940 | 1760 | #ifdef CONFIG_MEMORY_HOTREMOVE |
d6de9d53 | 1761 | static int check_memblock_offlined_cb(struct memory_block *mem, void *arg) |
bbc76be6 WC |
1762 | { |
1763 | int ret = !is_memblock_offlined(mem); | |
1764 | ||
349daa0f RD |
1765 | if (unlikely(ret)) { |
1766 | phys_addr_t beginpa, endpa; | |
1767 | ||
1768 | beginpa = PFN_PHYS(section_nr_to_pfn(mem->start_section_nr)); | |
1769 | endpa = PFN_PHYS(section_nr_to_pfn(mem->end_section_nr + 1))-1; | |
756a025f | 1770 | pr_warn("removing memory fails, because memory [%pa-%pa] is onlined\n", |
349daa0f RD |
1771 | &beginpa, &endpa); |
1772 | } | |
bbc76be6 WC |
1773 | |
1774 | return ret; | |
1775 | } | |
1776 | ||
0f1cfe9d | 1777 | static int check_cpu_on_node(pg_data_t *pgdat) |
60a5a19e | 1778 | { |
60a5a19e TC |
1779 | int cpu; |
1780 | ||
1781 | for_each_present_cpu(cpu) { | |
1782 | if (cpu_to_node(cpu) == pgdat->node_id) | |
1783 | /* | |
1784 | * the cpu on this node isn't removed, and we can't | |
1785 | * offline this node. | |
1786 | */ | |
1787 | return -EBUSY; | |
1788 | } | |
1789 | ||
1790 | return 0; | |
1791 | } | |
1792 | ||
0f1cfe9d | 1793 | static void unmap_cpu_on_node(pg_data_t *pgdat) |
e13fe869 WC |
1794 | { |
1795 | #ifdef CONFIG_ACPI_NUMA | |
e13fe869 WC |
1796 | int cpu; |
1797 | ||
1798 | for_each_possible_cpu(cpu) | |
1799 | if (cpu_to_node(cpu) == pgdat->node_id) | |
1800 | numa_clear_node(cpu); | |
1801 | #endif | |
1802 | } | |
1803 | ||
0f1cfe9d | 1804 | static int check_and_unmap_cpu_on_node(pg_data_t *pgdat) |
e13fe869 | 1805 | { |
0f1cfe9d | 1806 | int ret; |
e13fe869 | 1807 | |
0f1cfe9d | 1808 | ret = check_cpu_on_node(pgdat); |
e13fe869 WC |
1809 | if (ret) |
1810 | return ret; | |
1811 | ||
1812 | /* | |
1813 | * the node will be offlined when we come here, so we can clear | |
1814 | * the cpu_to_node() now. | |
1815 | */ | |
1816 | ||
0f1cfe9d | 1817 | unmap_cpu_on_node(pgdat); |
e13fe869 WC |
1818 | return 0; |
1819 | } | |
1820 | ||
0f1cfe9d TK |
1821 | /** |
1822 | * try_offline_node | |
1823 | * | |
1824 | * Offline a node if all memory sections and cpus of the node are removed. | |
1825 | * | |
1826 | * NOTE: The caller must call lock_device_hotplug() to serialize hotplug | |
1827 | * and online/offline operations before this call. | |
1828 | */ | |
90b30cdc | 1829 | void try_offline_node(int nid) |
60a5a19e | 1830 | { |
d822b86a WC |
1831 | pg_data_t *pgdat = NODE_DATA(nid); |
1832 | unsigned long start_pfn = pgdat->node_start_pfn; | |
1833 | unsigned long end_pfn = start_pfn + pgdat->node_spanned_pages; | |
60a5a19e TC |
1834 | unsigned long pfn; |
1835 | ||
1836 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { | |
1837 | unsigned long section_nr = pfn_to_section_nr(pfn); | |
1838 | ||
1839 | if (!present_section_nr(section_nr)) | |
1840 | continue; | |
1841 | ||
1842 | if (pfn_to_nid(pfn) != nid) | |
1843 | continue; | |
1844 | ||
1845 | /* | |
1846 | * some memory sections of this node are not removed, and we | |
1847 | * can't offline node now. | |
1848 | */ | |
1849 | return; | |
1850 | } | |
1851 | ||
0f1cfe9d | 1852 | if (check_and_unmap_cpu_on_node(pgdat)) |
60a5a19e TC |
1853 | return; |
1854 | ||
1855 | /* | |
1856 | * all memory/cpu of this node are removed, we can offline this | |
1857 | * node now. | |
1858 | */ | |
1859 | node_set_offline(nid); | |
1860 | unregister_one_node(nid); | |
1861 | } | |
90b30cdc | 1862 | EXPORT_SYMBOL(try_offline_node); |
60a5a19e | 1863 | |
0f1cfe9d TK |
1864 | /** |
1865 | * remove_memory | |
1866 | * | |
1867 | * NOTE: The caller must call lock_device_hotplug() to serialize hotplug | |
1868 | * and online/offline operations before this call, as required by | |
1869 | * try_offline_node(). | |
1870 | */ | |
242831eb | 1871 | void __ref remove_memory(int nid, u64 start, u64 size) |
bbc76be6 | 1872 | { |
242831eb | 1873 | int ret; |
993c1aad | 1874 | |
27356f54 TK |
1875 | BUG_ON(check_hotplug_memory_range(start, size)); |
1876 | ||
bfc8c901 | 1877 | mem_hotplug_begin(); |
6677e3ea YI |
1878 | |
1879 | /* | |
242831eb RW |
1880 | * All memory blocks must be offlined before removing memory. Check |
1881 | * whether all memory blocks in question are offline and trigger a BUG() | |
1882 | * if this is not the case. | |
6677e3ea | 1883 | */ |
242831eb | 1884 | ret = walk_memory_range(PFN_DOWN(start), PFN_UP(start + size - 1), NULL, |
d6de9d53 | 1885 | check_memblock_offlined_cb); |
bfc8c901 | 1886 | if (ret) |
242831eb | 1887 | BUG(); |
6677e3ea | 1888 | |
46c66c4b YI |
1889 | /* remove memmap entry */ |
1890 | firmware_map_remove(start, start + size, "System RAM"); | |
f9126ab9 XQ |
1891 | memblock_free(start, size); |
1892 | memblock_remove(start, size); | |
46c66c4b | 1893 | |
24d335ca WC |
1894 | arch_remove_memory(start, size); |
1895 | ||
60a5a19e TC |
1896 | try_offline_node(nid); |
1897 | ||
bfc8c901 | 1898 | mem_hotplug_done(); |
71088785 | 1899 | } |
71088785 | 1900 | EXPORT_SYMBOL_GPL(remove_memory); |
aba6efc4 | 1901 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |