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> |
698b1b30 | 36 | #include <linux/compaction.h> |
3947be19 DH |
37 | |
38 | #include <asm/tlbflush.h> | |
39 | ||
1e5ad9a3 AB |
40 | #include "internal.h" |
41 | ||
9d0ad8ca DK |
42 | /* |
43 | * online_page_callback contains pointer to current page onlining function. | |
44 | * Initially it is generic_online_page(). If it is required it could be | |
45 | * changed by calling set_online_page_callback() for callback registration | |
46 | * and restore_online_page_callback() for generic callback restore. | |
47 | */ | |
48 | ||
49 | static void generic_online_page(struct page *page); | |
50 | ||
51 | static online_page_callback_t online_page_callback = generic_online_page; | |
bfc8c901 | 52 | static DEFINE_MUTEX(online_page_callback_lock); |
9d0ad8ca | 53 | |
3f906ba2 | 54 | DEFINE_STATIC_PERCPU_RWSEM(mem_hotplug_lock); |
bfc8c901 | 55 | |
3f906ba2 TG |
56 | void get_online_mems(void) |
57 | { | |
58 | percpu_down_read(&mem_hotplug_lock); | |
59 | } | |
bfc8c901 | 60 | |
3f906ba2 TG |
61 | void put_online_mems(void) |
62 | { | |
63 | percpu_up_read(&mem_hotplug_lock); | |
64 | } | |
bfc8c901 | 65 | |
4932381e MH |
66 | bool movable_node_enabled = false; |
67 | ||
8604d9e5 | 68 | #ifndef CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE |
31bc3858 | 69 | bool memhp_auto_online; |
8604d9e5 VK |
70 | #else |
71 | bool memhp_auto_online = true; | |
72 | #endif | |
31bc3858 VK |
73 | EXPORT_SYMBOL_GPL(memhp_auto_online); |
74 | ||
86dd995d VK |
75 | static int __init setup_memhp_default_state(char *str) |
76 | { | |
77 | if (!strcmp(str, "online")) | |
78 | memhp_auto_online = true; | |
79 | else if (!strcmp(str, "offline")) | |
80 | memhp_auto_online = false; | |
81 | ||
82 | return 1; | |
83 | } | |
84 | __setup("memhp_default_state=", setup_memhp_default_state); | |
85 | ||
30467e0b | 86 | void mem_hotplug_begin(void) |
20d6c96b | 87 | { |
3f906ba2 TG |
88 | cpus_read_lock(); |
89 | percpu_down_write(&mem_hotplug_lock); | |
20d6c96b KM |
90 | } |
91 | ||
30467e0b | 92 | void mem_hotplug_done(void) |
bfc8c901 | 93 | { |
3f906ba2 TG |
94 | percpu_up_write(&mem_hotplug_lock); |
95 | cpus_read_unlock(); | |
bfc8c901 | 96 | } |
20d6c96b | 97 | |
45e0b78b KM |
98 | /* add this memory to iomem resource */ |
99 | static struct resource *register_memory_resource(u64 start, u64 size) | |
100 | { | |
5042db43 | 101 | struct resource *res, *conflict; |
45e0b78b | 102 | res = kzalloc(sizeof(struct resource), GFP_KERNEL); |
6f754ba4 VK |
103 | if (!res) |
104 | return ERR_PTR(-ENOMEM); | |
45e0b78b KM |
105 | |
106 | res->name = "System RAM"; | |
107 | res->start = start; | |
108 | res->end = start + size - 1; | |
782b8664 | 109 | res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; |
5042db43 JG |
110 | conflict = request_resource_conflict(&iomem_resource, res); |
111 | if (conflict) { | |
112 | if (conflict->desc == IORES_DESC_DEVICE_PRIVATE_MEMORY) { | |
113 | pr_debug("Device unaddressable memory block " | |
114 | "memory hotplug at %#010llx !\n", | |
115 | (unsigned long long)start); | |
116 | } | |
4996eed8 | 117 | pr_debug("System RAM resource %pR cannot be added\n", res); |
45e0b78b | 118 | kfree(res); |
6f754ba4 | 119 | return ERR_PTR(-EEXIST); |
45e0b78b KM |
120 | } |
121 | return res; | |
122 | } | |
123 | ||
124 | static void release_memory_resource(struct resource *res) | |
125 | { | |
126 | if (!res) | |
127 | return; | |
128 | release_resource(res); | |
129 | kfree(res); | |
130 | return; | |
131 | } | |
132 | ||
53947027 | 133 | #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE |
46723bfa YI |
134 | void get_page_bootmem(unsigned long info, struct page *page, |
135 | unsigned long type) | |
04753278 | 136 | { |
ddffe98d | 137 | page->freelist = (void *)type; |
04753278 YG |
138 | SetPagePrivate(page); |
139 | set_page_private(page, info); | |
fe896d18 | 140 | page_ref_inc(page); |
04753278 YG |
141 | } |
142 | ||
170a5a7e | 143 | void put_page_bootmem(struct page *page) |
04753278 | 144 | { |
5f24ce5f | 145 | unsigned long type; |
04753278 | 146 | |
ddffe98d | 147 | type = (unsigned long) page->freelist; |
5f24ce5f AA |
148 | BUG_ON(type < MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE || |
149 | type > MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE); | |
04753278 | 150 | |
fe896d18 | 151 | if (page_ref_dec_return(page) == 1) { |
ddffe98d | 152 | page->freelist = NULL; |
04753278 YG |
153 | ClearPagePrivate(page); |
154 | set_page_private(page, 0); | |
5f24ce5f | 155 | INIT_LIST_HEAD(&page->lru); |
170a5a7e | 156 | free_reserved_page(page); |
04753278 | 157 | } |
04753278 YG |
158 | } |
159 | ||
46723bfa YI |
160 | #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE |
161 | #ifndef CONFIG_SPARSEMEM_VMEMMAP | |
d92bc318 | 162 | static void register_page_bootmem_info_section(unsigned long start_pfn) |
04753278 YG |
163 | { |
164 | unsigned long *usemap, mapsize, section_nr, i; | |
165 | struct mem_section *ms; | |
166 | struct page *page, *memmap; | |
167 | ||
04753278 YG |
168 | section_nr = pfn_to_section_nr(start_pfn); |
169 | ms = __nr_to_section(section_nr); | |
170 | ||
171 | /* Get section's memmap address */ | |
172 | memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); | |
173 | ||
174 | /* | |
175 | * Get page for the memmap's phys address | |
176 | * XXX: need more consideration for sparse_vmemmap... | |
177 | */ | |
178 | page = virt_to_page(memmap); | |
179 | mapsize = sizeof(struct page) * PAGES_PER_SECTION; | |
180 | mapsize = PAGE_ALIGN(mapsize) >> PAGE_SHIFT; | |
181 | ||
182 | /* remember memmap's page */ | |
183 | for (i = 0; i < mapsize; i++, page++) | |
184 | get_page_bootmem(section_nr, page, SECTION_INFO); | |
185 | ||
9ac9322d | 186 | usemap = ms->pageblock_flags; |
04753278 YG |
187 | page = virt_to_page(usemap); |
188 | ||
189 | mapsize = PAGE_ALIGN(usemap_size()) >> PAGE_SHIFT; | |
190 | ||
191 | for (i = 0; i < mapsize; i++, page++) | |
af370fb8 | 192 | get_page_bootmem(section_nr, page, MIX_SECTION_INFO); |
04753278 YG |
193 | |
194 | } | |
46723bfa YI |
195 | #else /* CONFIG_SPARSEMEM_VMEMMAP */ |
196 | static void register_page_bootmem_info_section(unsigned long start_pfn) | |
197 | { | |
198 | unsigned long *usemap, mapsize, section_nr, i; | |
199 | struct mem_section *ms; | |
200 | struct page *page, *memmap; | |
201 | ||
46723bfa YI |
202 | section_nr = pfn_to_section_nr(start_pfn); |
203 | ms = __nr_to_section(section_nr); | |
204 | ||
205 | memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); | |
206 | ||
207 | register_page_bootmem_memmap(section_nr, memmap, PAGES_PER_SECTION); | |
208 | ||
9ac9322d | 209 | usemap = ms->pageblock_flags; |
46723bfa YI |
210 | page = virt_to_page(usemap); |
211 | ||
212 | mapsize = PAGE_ALIGN(usemap_size()) >> PAGE_SHIFT; | |
213 | ||
214 | for (i = 0; i < mapsize; i++, page++) | |
215 | get_page_bootmem(section_nr, page, MIX_SECTION_INFO); | |
216 | } | |
217 | #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ | |
04753278 | 218 | |
7ded384a | 219 | void __init register_page_bootmem_info_node(struct pglist_data *pgdat) |
04753278 YG |
220 | { |
221 | unsigned long i, pfn, end_pfn, nr_pages; | |
222 | int node = pgdat->node_id; | |
223 | struct page *page; | |
04753278 YG |
224 | |
225 | nr_pages = PAGE_ALIGN(sizeof(struct pglist_data)) >> PAGE_SHIFT; | |
226 | page = virt_to_page(pgdat); | |
227 | ||
228 | for (i = 0; i < nr_pages; i++, page++) | |
229 | get_page_bootmem(node, page, NODE_INFO); | |
230 | ||
04753278 | 231 | pfn = pgdat->node_start_pfn; |
c1f19495 | 232 | end_pfn = pgdat_end_pfn(pgdat); |
04753278 | 233 | |
7e9f5eb0 | 234 | /* register section info */ |
f14851af | 235 | for (; pfn < end_pfn; pfn += PAGES_PER_SECTION) { |
236 | /* | |
237 | * Some platforms can assign the same pfn to multiple nodes - on | |
238 | * node0 as well as nodeN. To avoid registering a pfn against | |
239 | * multiple nodes we check that this pfn does not already | |
7e9f5eb0 | 240 | * reside in some other nodes. |
f14851af | 241 | */ |
f65e91df | 242 | if (pfn_valid(pfn) && (early_pfn_to_nid(pfn) == node)) |
f14851af | 243 | register_page_bootmem_info_section(pfn); |
244 | } | |
04753278 | 245 | } |
46723bfa | 246 | #endif /* CONFIG_HAVE_BOOTMEM_INFO_NODE */ |
04753278 | 247 | |
f1dd2cd1 | 248 | static int __meminit __add_section(int nid, unsigned long phys_start_pfn, |
7b73d978 | 249 | struct vmem_altmap *altmap, bool want_memblock) |
3947be19 | 250 | { |
3947be19 DH |
251 | int ret; |
252 | ||
ebd15302 KH |
253 | if (pfn_valid(phys_start_pfn)) |
254 | return -EEXIST; | |
255 | ||
7b73d978 | 256 | ret = sparse_add_one_section(NODE_DATA(nid), phys_start_pfn, altmap); |
3947be19 DH |
257 | if (ret < 0) |
258 | return ret; | |
259 | ||
1b862aec MH |
260 | if (!want_memblock) |
261 | return 0; | |
262 | ||
fc44f7f9 | 263 | return hotplug_memory_register(nid, __pfn_to_section(phys_start_pfn)); |
3947be19 DH |
264 | } |
265 | ||
4edd7cef DR |
266 | /* |
267 | * Reasonably generic function for adding memory. It is | |
268 | * expected that archs that support memory hotplug will | |
269 | * call this function after deciding the zone to which to | |
270 | * add the new pages. | |
271 | */ | |
f1dd2cd1 | 272 | int __ref __add_pages(int nid, unsigned long phys_start_pfn, |
24e6d5a5 CH |
273 | unsigned long nr_pages, struct vmem_altmap *altmap, |
274 | bool want_memblock) | |
4edd7cef DR |
275 | { |
276 | unsigned long i; | |
277 | int err = 0; | |
278 | int start_sec, end_sec; | |
4b94ffdc | 279 | |
4edd7cef DR |
280 | /* during initialize mem_map, align hot-added range to section */ |
281 | start_sec = pfn_to_section_nr(phys_start_pfn); | |
282 | end_sec = pfn_to_section_nr(phys_start_pfn + nr_pages - 1); | |
283 | ||
4b94ffdc DW |
284 | if (altmap) { |
285 | /* | |
286 | * Validate altmap is within bounds of the total request | |
287 | */ | |
288 | if (altmap->base_pfn != phys_start_pfn | |
289 | || vmem_altmap_offset(altmap) > nr_pages) { | |
290 | pr_warn_once("memory add fail, invalid altmap\n"); | |
7cf91a98 JK |
291 | err = -EINVAL; |
292 | goto out; | |
4b94ffdc DW |
293 | } |
294 | altmap->alloc = 0; | |
295 | } | |
296 | ||
4edd7cef | 297 | for (i = start_sec; i <= end_sec; i++) { |
7b73d978 CH |
298 | err = __add_section(nid, section_nr_to_pfn(i), altmap, |
299 | want_memblock); | |
4edd7cef DR |
300 | |
301 | /* | |
302 | * EEXIST is finally dealt with by ioresource collision | |
303 | * check. see add_memory() => register_memory_resource() | |
304 | * Warning will be printed if there is collision. | |
305 | */ | |
306 | if (err && (err != -EEXIST)) | |
307 | break; | |
308 | err = 0; | |
f64ac5e6 | 309 | cond_resched(); |
4edd7cef | 310 | } |
c435a390 | 311 | vmemmap_populate_print_last(); |
7cf91a98 | 312 | out: |
4edd7cef DR |
313 | return err; |
314 | } | |
4edd7cef DR |
315 | |
316 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
815121d2 | 317 | /* find the smallest valid pfn in the range [start_pfn, end_pfn) */ |
d09b0137 | 318 | static unsigned long find_smallest_section_pfn(int nid, struct zone *zone, |
815121d2 YI |
319 | unsigned long start_pfn, |
320 | unsigned long end_pfn) | |
321 | { | |
322 | struct mem_section *ms; | |
323 | ||
324 | for (; start_pfn < end_pfn; start_pfn += PAGES_PER_SECTION) { | |
325 | ms = __pfn_to_section(start_pfn); | |
326 | ||
327 | if (unlikely(!valid_section(ms))) | |
328 | continue; | |
329 | ||
330 | if (unlikely(pfn_to_nid(start_pfn) != nid)) | |
331 | continue; | |
332 | ||
333 | if (zone && zone != page_zone(pfn_to_page(start_pfn))) | |
334 | continue; | |
335 | ||
336 | return start_pfn; | |
337 | } | |
338 | ||
339 | return 0; | |
340 | } | |
341 | ||
342 | /* find the biggest valid pfn in the range [start_pfn, end_pfn). */ | |
d09b0137 | 343 | static unsigned long find_biggest_section_pfn(int nid, struct zone *zone, |
815121d2 YI |
344 | unsigned long start_pfn, |
345 | unsigned long end_pfn) | |
346 | { | |
347 | struct mem_section *ms; | |
348 | unsigned long pfn; | |
349 | ||
350 | /* pfn is the end pfn of a memory section. */ | |
351 | pfn = end_pfn - 1; | |
352 | for (; pfn >= start_pfn; pfn -= PAGES_PER_SECTION) { | |
353 | ms = __pfn_to_section(pfn); | |
354 | ||
355 | if (unlikely(!valid_section(ms))) | |
356 | continue; | |
357 | ||
358 | if (unlikely(pfn_to_nid(pfn) != nid)) | |
359 | continue; | |
360 | ||
361 | if (zone && zone != page_zone(pfn_to_page(pfn))) | |
362 | continue; | |
363 | ||
364 | return pfn; | |
365 | } | |
366 | ||
367 | return 0; | |
368 | } | |
369 | ||
370 | static void shrink_zone_span(struct zone *zone, unsigned long start_pfn, | |
371 | unsigned long end_pfn) | |
372 | { | |
c33bc315 XQ |
373 | unsigned long zone_start_pfn = zone->zone_start_pfn; |
374 | unsigned long z = zone_end_pfn(zone); /* zone_end_pfn namespace clash */ | |
375 | unsigned long zone_end_pfn = z; | |
815121d2 YI |
376 | unsigned long pfn; |
377 | struct mem_section *ms; | |
378 | int nid = zone_to_nid(zone); | |
379 | ||
380 | zone_span_writelock(zone); | |
381 | if (zone_start_pfn == start_pfn) { | |
382 | /* | |
383 | * If the section is smallest section in the zone, it need | |
384 | * shrink zone->zone_start_pfn and zone->zone_spanned_pages. | |
385 | * In this case, we find second smallest valid mem_section | |
386 | * for shrinking zone. | |
387 | */ | |
388 | pfn = find_smallest_section_pfn(nid, zone, end_pfn, | |
389 | zone_end_pfn); | |
390 | if (pfn) { | |
391 | zone->zone_start_pfn = pfn; | |
392 | zone->spanned_pages = zone_end_pfn - pfn; | |
393 | } | |
394 | } else if (zone_end_pfn == end_pfn) { | |
395 | /* | |
396 | * If the section is biggest section in the zone, it need | |
397 | * shrink zone->spanned_pages. | |
398 | * In this case, we find second biggest valid mem_section for | |
399 | * shrinking zone. | |
400 | */ | |
401 | pfn = find_biggest_section_pfn(nid, zone, zone_start_pfn, | |
402 | start_pfn); | |
403 | if (pfn) | |
404 | zone->spanned_pages = pfn - zone_start_pfn + 1; | |
405 | } | |
406 | ||
407 | /* | |
408 | * The section is not biggest or smallest mem_section in the zone, it | |
409 | * only creates a hole in the zone. So in this case, we need not | |
410 | * change the zone. But perhaps, the zone has only hole data. Thus | |
411 | * it check the zone has only hole or not. | |
412 | */ | |
413 | pfn = zone_start_pfn; | |
414 | for (; pfn < zone_end_pfn; pfn += PAGES_PER_SECTION) { | |
415 | ms = __pfn_to_section(pfn); | |
416 | ||
417 | if (unlikely(!valid_section(ms))) | |
418 | continue; | |
419 | ||
420 | if (page_zone(pfn_to_page(pfn)) != zone) | |
421 | continue; | |
422 | ||
423 | /* If the section is current section, it continues the loop */ | |
424 | if (start_pfn == pfn) | |
425 | continue; | |
426 | ||
427 | /* If we find valid section, we have nothing to do */ | |
428 | zone_span_writeunlock(zone); | |
429 | return; | |
430 | } | |
431 | ||
432 | /* The zone has no valid section */ | |
433 | zone->zone_start_pfn = 0; | |
434 | zone->spanned_pages = 0; | |
435 | zone_span_writeunlock(zone); | |
436 | } | |
437 | ||
438 | static void shrink_pgdat_span(struct pglist_data *pgdat, | |
439 | unsigned long start_pfn, unsigned long end_pfn) | |
440 | { | |
83285c72 XQ |
441 | unsigned long pgdat_start_pfn = pgdat->node_start_pfn; |
442 | unsigned long p = pgdat_end_pfn(pgdat); /* pgdat_end_pfn namespace clash */ | |
443 | unsigned long pgdat_end_pfn = p; | |
815121d2 YI |
444 | unsigned long pfn; |
445 | struct mem_section *ms; | |
446 | int nid = pgdat->node_id; | |
447 | ||
448 | if (pgdat_start_pfn == start_pfn) { | |
449 | /* | |
450 | * If the section is smallest section in the pgdat, it need | |
451 | * shrink pgdat->node_start_pfn and pgdat->node_spanned_pages. | |
452 | * In this case, we find second smallest valid mem_section | |
453 | * for shrinking zone. | |
454 | */ | |
455 | pfn = find_smallest_section_pfn(nid, NULL, end_pfn, | |
456 | pgdat_end_pfn); | |
457 | if (pfn) { | |
458 | pgdat->node_start_pfn = pfn; | |
459 | pgdat->node_spanned_pages = pgdat_end_pfn - pfn; | |
460 | } | |
461 | } else if (pgdat_end_pfn == end_pfn) { | |
462 | /* | |
463 | * If the section is biggest section in the pgdat, it need | |
464 | * shrink pgdat->node_spanned_pages. | |
465 | * In this case, we find second biggest valid mem_section for | |
466 | * shrinking zone. | |
467 | */ | |
468 | pfn = find_biggest_section_pfn(nid, NULL, pgdat_start_pfn, | |
469 | start_pfn); | |
470 | if (pfn) | |
471 | pgdat->node_spanned_pages = pfn - pgdat_start_pfn + 1; | |
472 | } | |
473 | ||
474 | /* | |
475 | * If the section is not biggest or smallest mem_section in the pgdat, | |
476 | * it only creates a hole in the pgdat. So in this case, we need not | |
477 | * change the pgdat. | |
478 | * But perhaps, the pgdat has only hole data. Thus it check the pgdat | |
479 | * has only hole or not. | |
480 | */ | |
481 | pfn = pgdat_start_pfn; | |
482 | for (; pfn < pgdat_end_pfn; pfn += PAGES_PER_SECTION) { | |
483 | ms = __pfn_to_section(pfn); | |
484 | ||
485 | if (unlikely(!valid_section(ms))) | |
486 | continue; | |
487 | ||
488 | if (pfn_to_nid(pfn) != nid) | |
489 | continue; | |
490 | ||
491 | /* If the section is current section, it continues the loop */ | |
492 | if (start_pfn == pfn) | |
493 | continue; | |
494 | ||
495 | /* If we find valid section, we have nothing to do */ | |
496 | return; | |
497 | } | |
498 | ||
499 | /* The pgdat has no valid section */ | |
500 | pgdat->node_start_pfn = 0; | |
501 | pgdat->node_spanned_pages = 0; | |
502 | } | |
503 | ||
504 | static void __remove_zone(struct zone *zone, unsigned long start_pfn) | |
505 | { | |
506 | struct pglist_data *pgdat = zone->zone_pgdat; | |
507 | int nr_pages = PAGES_PER_SECTION; | |
815121d2 YI |
508 | unsigned long flags; |
509 | ||
815121d2 YI |
510 | pgdat_resize_lock(zone->zone_pgdat, &flags); |
511 | shrink_zone_span(zone, start_pfn, start_pfn + nr_pages); | |
512 | shrink_pgdat_span(pgdat, start_pfn, start_pfn + nr_pages); | |
513 | pgdat_resize_unlock(zone->zone_pgdat, &flags); | |
514 | } | |
515 | ||
4b94ffdc | 516 | static int __remove_section(struct zone *zone, struct mem_section *ms, |
24b6d416 | 517 | unsigned long map_offset, struct vmem_altmap *altmap) |
ea01ea93 | 518 | { |
815121d2 YI |
519 | unsigned long start_pfn; |
520 | int scn_nr; | |
ea01ea93 BP |
521 | int ret = -EINVAL; |
522 | ||
523 | if (!valid_section(ms)) | |
524 | return ret; | |
525 | ||
526 | ret = unregister_memory_section(ms); | |
527 | if (ret) | |
528 | return ret; | |
529 | ||
815121d2 | 530 | scn_nr = __section_nr(ms); |
1dd2bfc8 | 531 | start_pfn = section_nr_to_pfn((unsigned long)scn_nr); |
815121d2 YI |
532 | __remove_zone(zone, start_pfn); |
533 | ||
24b6d416 | 534 | sparse_remove_one_section(zone, ms, map_offset, altmap); |
ea01ea93 BP |
535 | return 0; |
536 | } | |
537 | ||
ea01ea93 BP |
538 | /** |
539 | * __remove_pages() - remove sections of pages from a zone | |
540 | * @zone: zone from which pages need to be removed | |
541 | * @phys_start_pfn: starting pageframe (must be aligned to start of a section) | |
542 | * @nr_pages: number of pages to remove (must be multiple of section size) | |
e8b098fc | 543 | * @altmap: alternative device page map or %NULL if default memmap is used |
ea01ea93 BP |
544 | * |
545 | * Generic helper function to remove section mappings and sysfs entries | |
546 | * for the section of the memory we are removing. Caller needs to make | |
547 | * sure that pages are marked reserved and zones are adjust properly by | |
548 | * calling offline_pages(). | |
549 | */ | |
550 | int __remove_pages(struct zone *zone, unsigned long phys_start_pfn, | |
da024512 | 551 | unsigned long nr_pages, struct vmem_altmap *altmap) |
ea01ea93 | 552 | { |
fe74ebb1 | 553 | unsigned long i; |
4b94ffdc DW |
554 | unsigned long map_offset = 0; |
555 | int sections_to_remove, ret = 0; | |
556 | ||
557 | /* In the ZONE_DEVICE case device driver owns the memory region */ | |
558 | if (is_dev_zone(zone)) { | |
4b94ffdc DW |
559 | if (altmap) |
560 | map_offset = vmem_altmap_offset(altmap); | |
561 | } else { | |
562 | resource_size_t start, size; | |
563 | ||
564 | start = phys_start_pfn << PAGE_SHIFT; | |
565 | size = nr_pages * PAGE_SIZE; | |
566 | ||
567 | ret = release_mem_region_adjustable(&iomem_resource, start, | |
568 | size); | |
569 | if (ret) { | |
570 | resource_size_t endres = start + size - 1; | |
571 | ||
572 | pr_warn("Unable to release resource <%pa-%pa> (%d)\n", | |
573 | &start, &endres, ret); | |
574 | } | |
575 | } | |
ea01ea93 | 576 | |
7cf91a98 JK |
577 | clear_zone_contiguous(zone); |
578 | ||
ea01ea93 BP |
579 | /* |
580 | * We can only remove entire sections | |
581 | */ | |
582 | BUG_ON(phys_start_pfn & ~PAGE_SECTION_MASK); | |
583 | BUG_ON(nr_pages % PAGES_PER_SECTION); | |
584 | ||
ea01ea93 BP |
585 | sections_to_remove = nr_pages / PAGES_PER_SECTION; |
586 | for (i = 0; i < sections_to_remove; i++) { | |
587 | unsigned long pfn = phys_start_pfn + i*PAGES_PER_SECTION; | |
4b94ffdc | 588 | |
24b6d416 CH |
589 | ret = __remove_section(zone, __pfn_to_section(pfn), map_offset, |
590 | altmap); | |
4b94ffdc | 591 | map_offset = 0; |
ea01ea93 BP |
592 | if (ret) |
593 | break; | |
594 | } | |
7cf91a98 JK |
595 | |
596 | set_zone_contiguous(zone); | |
597 | ||
ea01ea93 BP |
598 | return ret; |
599 | } | |
4edd7cef | 600 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
ea01ea93 | 601 | |
9d0ad8ca DK |
602 | int set_online_page_callback(online_page_callback_t callback) |
603 | { | |
604 | int rc = -EINVAL; | |
605 | ||
bfc8c901 VD |
606 | get_online_mems(); |
607 | mutex_lock(&online_page_callback_lock); | |
9d0ad8ca DK |
608 | |
609 | if (online_page_callback == generic_online_page) { | |
610 | online_page_callback = callback; | |
611 | rc = 0; | |
612 | } | |
613 | ||
bfc8c901 VD |
614 | mutex_unlock(&online_page_callback_lock); |
615 | put_online_mems(); | |
9d0ad8ca DK |
616 | |
617 | return rc; | |
618 | } | |
619 | EXPORT_SYMBOL_GPL(set_online_page_callback); | |
620 | ||
621 | int restore_online_page_callback(online_page_callback_t callback) | |
622 | { | |
623 | int rc = -EINVAL; | |
624 | ||
bfc8c901 VD |
625 | get_online_mems(); |
626 | mutex_lock(&online_page_callback_lock); | |
9d0ad8ca DK |
627 | |
628 | if (online_page_callback == callback) { | |
629 | online_page_callback = generic_online_page; | |
630 | rc = 0; | |
631 | } | |
632 | ||
bfc8c901 VD |
633 | mutex_unlock(&online_page_callback_lock); |
634 | put_online_mems(); | |
9d0ad8ca DK |
635 | |
636 | return rc; | |
637 | } | |
638 | EXPORT_SYMBOL_GPL(restore_online_page_callback); | |
639 | ||
640 | void __online_page_set_limits(struct page *page) | |
180c06ef | 641 | { |
9d0ad8ca DK |
642 | } |
643 | EXPORT_SYMBOL_GPL(__online_page_set_limits); | |
644 | ||
645 | void __online_page_increment_counters(struct page *page) | |
646 | { | |
3dcc0571 | 647 | adjust_managed_page_count(page, 1); |
9d0ad8ca DK |
648 | } |
649 | EXPORT_SYMBOL_GPL(__online_page_increment_counters); | |
180c06ef | 650 | |
9d0ad8ca DK |
651 | void __online_page_free(struct page *page) |
652 | { | |
3dcc0571 | 653 | __free_reserved_page(page); |
180c06ef | 654 | } |
9d0ad8ca DK |
655 | EXPORT_SYMBOL_GPL(__online_page_free); |
656 | ||
657 | static void generic_online_page(struct page *page) | |
658 | { | |
659 | __online_page_set_limits(page); | |
660 | __online_page_increment_counters(page); | |
661 | __online_page_free(page); | |
662 | } | |
180c06ef | 663 | |
75884fb1 KH |
664 | static int online_pages_range(unsigned long start_pfn, unsigned long nr_pages, |
665 | void *arg) | |
3947be19 DH |
666 | { |
667 | unsigned long i; | |
75884fb1 KH |
668 | unsigned long onlined_pages = *(unsigned long *)arg; |
669 | struct page *page; | |
2d070eab | 670 | |
75884fb1 KH |
671 | if (PageReserved(pfn_to_page(start_pfn))) |
672 | for (i = 0; i < nr_pages; i++) { | |
673 | page = pfn_to_page(start_pfn + i); | |
9d0ad8ca | 674 | (*online_page_callback)(page); |
75884fb1 KH |
675 | onlined_pages++; |
676 | } | |
2d070eab MH |
677 | |
678 | online_mem_sections(start_pfn, start_pfn + nr_pages); | |
679 | ||
75884fb1 KH |
680 | *(unsigned long *)arg = onlined_pages; |
681 | return 0; | |
682 | } | |
683 | ||
d9713679 LJ |
684 | /* check which state of node_states will be changed when online memory */ |
685 | static void node_states_check_changes_online(unsigned long nr_pages, | |
686 | struct zone *zone, struct memory_notify *arg) | |
687 | { | |
688 | int nid = zone_to_nid(zone); | |
d9713679 | 689 | |
8efe33f4 OS |
690 | arg->status_change_nid = -1; |
691 | arg->status_change_nid_normal = -1; | |
692 | arg->status_change_nid_high = -1; | |
d9713679 | 693 | |
8efe33f4 OS |
694 | if (!node_state(nid, N_MEMORY)) |
695 | arg->status_change_nid = nid; | |
696 | if (zone_idx(zone) <= ZONE_NORMAL && !node_state(nid, N_NORMAL_MEMORY)) | |
d9713679 | 697 | arg->status_change_nid_normal = nid; |
6715ddf9 | 698 | #ifdef CONFIG_HIGHMEM |
8efe33f4 | 699 | if (zone_idx(zone) <= N_HIGH_MEMORY && !node_state(nid, N_HIGH_MEMORY)) |
6715ddf9 | 700 | arg->status_change_nid_high = nid; |
6715ddf9 | 701 | #endif |
d9713679 LJ |
702 | } |
703 | ||
704 | static void node_states_set_node(int node, struct memory_notify *arg) | |
705 | { | |
706 | if (arg->status_change_nid_normal >= 0) | |
707 | node_set_state(node, N_NORMAL_MEMORY); | |
708 | ||
6715ddf9 LJ |
709 | if (arg->status_change_nid_high >= 0) |
710 | node_set_state(node, N_HIGH_MEMORY); | |
711 | ||
83d83612 OS |
712 | if (arg->status_change_nid >= 0) |
713 | node_set_state(node, N_MEMORY); | |
d9713679 LJ |
714 | } |
715 | ||
f1dd2cd1 MH |
716 | static void __meminit resize_zone_range(struct zone *zone, unsigned long start_pfn, |
717 | unsigned long nr_pages) | |
718 | { | |
719 | unsigned long old_end_pfn = zone_end_pfn(zone); | |
720 | ||
721 | if (zone_is_empty(zone) || start_pfn < zone->zone_start_pfn) | |
722 | zone->zone_start_pfn = start_pfn; | |
723 | ||
724 | zone->spanned_pages = max(start_pfn + nr_pages, old_end_pfn) - zone->zone_start_pfn; | |
725 | } | |
726 | ||
727 | static void __meminit resize_pgdat_range(struct pglist_data *pgdat, unsigned long start_pfn, | |
728 | unsigned long nr_pages) | |
729 | { | |
730 | unsigned long old_end_pfn = pgdat_end_pfn(pgdat); | |
731 | ||
732 | if (!pgdat->node_spanned_pages || start_pfn < pgdat->node_start_pfn) | |
733 | pgdat->node_start_pfn = start_pfn; | |
734 | ||
735 | pgdat->node_spanned_pages = max(start_pfn + nr_pages, old_end_pfn) - pgdat->node_start_pfn; | |
736 | } | |
737 | ||
a99583e7 CH |
738 | void __ref move_pfn_range_to_zone(struct zone *zone, unsigned long start_pfn, |
739 | unsigned long nr_pages, struct vmem_altmap *altmap) | |
f1dd2cd1 MH |
740 | { |
741 | struct pglist_data *pgdat = zone->zone_pgdat; | |
742 | int nid = pgdat->node_id; | |
743 | unsigned long flags; | |
df429ac0 | 744 | |
f1dd2cd1 MH |
745 | if (zone_is_empty(zone)) |
746 | init_currently_empty_zone(zone, start_pfn, nr_pages); | |
df429ac0 | 747 | |
f1dd2cd1 MH |
748 | clear_zone_contiguous(zone); |
749 | ||
750 | /* TODO Huh pgdat is irqsave while zone is not. It used to be like that before */ | |
751 | pgdat_resize_lock(pgdat, &flags); | |
752 | zone_span_writelock(zone); | |
753 | resize_zone_range(zone, start_pfn, nr_pages); | |
754 | zone_span_writeunlock(zone); | |
755 | resize_pgdat_range(pgdat, start_pfn, nr_pages); | |
756 | pgdat_resize_unlock(pgdat, &flags); | |
757 | ||
758 | /* | |
759 | * TODO now we have a visible range of pages which are not associated | |
760 | * with their zone properly. Not nice but set_pfnblock_flags_mask | |
761 | * expects the zone spans the pfn range. All the pages in the range | |
762 | * are reserved so nobody should be touching them so we should be safe | |
763 | */ | |
a99583e7 CH |
764 | memmap_init_zone(nr_pages, nid, zone_idx(zone), start_pfn, |
765 | MEMMAP_HOTPLUG, altmap); | |
f1dd2cd1 MH |
766 | |
767 | set_zone_contiguous(zone); | |
768 | } | |
769 | ||
c246a213 MH |
770 | /* |
771 | * Returns a default kernel memory zone for the given pfn range. | |
772 | * If no kernel zone covers this pfn range it will automatically go | |
773 | * to the ZONE_NORMAL. | |
774 | */ | |
c6f03e29 | 775 | static struct zone *default_kernel_zone_for_pfn(int nid, unsigned long start_pfn, |
c246a213 MH |
776 | unsigned long nr_pages) |
777 | { | |
778 | struct pglist_data *pgdat = NODE_DATA(nid); | |
779 | int zid; | |
780 | ||
781 | for (zid = 0; zid <= ZONE_NORMAL; zid++) { | |
782 | struct zone *zone = &pgdat->node_zones[zid]; | |
783 | ||
784 | if (zone_intersects(zone, start_pfn, nr_pages)) | |
785 | return zone; | |
786 | } | |
787 | ||
788 | return &pgdat->node_zones[ZONE_NORMAL]; | |
789 | } | |
790 | ||
c6f03e29 MH |
791 | static inline struct zone *default_zone_for_pfn(int nid, unsigned long start_pfn, |
792 | unsigned long nr_pages) | |
e5e68930 | 793 | { |
c6f03e29 MH |
794 | struct zone *kernel_zone = default_kernel_zone_for_pfn(nid, start_pfn, |
795 | nr_pages); | |
796 | struct zone *movable_zone = &NODE_DATA(nid)->node_zones[ZONE_MOVABLE]; | |
797 | bool in_kernel = zone_intersects(kernel_zone, start_pfn, nr_pages); | |
798 | bool in_movable = zone_intersects(movable_zone, start_pfn, nr_pages); | |
e5e68930 MH |
799 | |
800 | /* | |
c6f03e29 MH |
801 | * We inherit the existing zone in a simple case where zones do not |
802 | * overlap in the given range | |
e5e68930 | 803 | */ |
c6f03e29 MH |
804 | if (in_kernel ^ in_movable) |
805 | return (in_kernel) ? kernel_zone : movable_zone; | |
9f123ab5 | 806 | |
c6f03e29 MH |
807 | /* |
808 | * If the range doesn't belong to any zone or two zones overlap in the | |
809 | * given range then we use movable zone only if movable_node is | |
810 | * enabled because we always online to a kernel zone by default. | |
811 | */ | |
812 | return movable_node_enabled ? movable_zone : kernel_zone; | |
9f123ab5 MH |
813 | } |
814 | ||
e5e68930 MH |
815 | struct zone * zone_for_pfn_range(int online_type, int nid, unsigned start_pfn, |
816 | unsigned long nr_pages) | |
f1dd2cd1 | 817 | { |
c6f03e29 MH |
818 | if (online_type == MMOP_ONLINE_KERNEL) |
819 | return default_kernel_zone_for_pfn(nid, start_pfn, nr_pages); | |
f1dd2cd1 | 820 | |
c6f03e29 MH |
821 | if (online_type == MMOP_ONLINE_MOVABLE) |
822 | return &NODE_DATA(nid)->node_zones[ZONE_MOVABLE]; | |
df429ac0 | 823 | |
c6f03e29 | 824 | return default_zone_for_pfn(nid, start_pfn, nr_pages); |
e5e68930 MH |
825 | } |
826 | ||
827 | /* | |
828 | * Associates the given pfn range with the given node and the zone appropriate | |
829 | * for the given online type. | |
830 | */ | |
831 | static struct zone * __meminit move_pfn_range(int online_type, int nid, | |
832 | unsigned long start_pfn, unsigned long nr_pages) | |
833 | { | |
834 | struct zone *zone; | |
835 | ||
836 | zone = zone_for_pfn_range(online_type, nid, start_pfn, nr_pages); | |
a99583e7 | 837 | move_pfn_range_to_zone(zone, start_pfn, nr_pages, NULL); |
f1dd2cd1 | 838 | return zone; |
df429ac0 | 839 | } |
75884fb1 | 840 | |
b93e0f32 | 841 | /* Must be protected by mem_hotplug_begin() or a device_lock */ |
511c2aba | 842 | int __ref online_pages(unsigned long pfn, unsigned long nr_pages, int online_type) |
75884fb1 | 843 | { |
aa47228a | 844 | unsigned long flags; |
3947be19 DH |
845 | unsigned long onlined_pages = 0; |
846 | struct zone *zone; | |
6811378e | 847 | int need_zonelists_rebuild = 0; |
7b78d335 YG |
848 | int nid; |
849 | int ret; | |
850 | struct memory_notify arg; | |
d0dc12e8 PT |
851 | struct memory_block *mem; |
852 | ||
853 | /* | |
854 | * We can't use pfn_to_nid() because nid might be stored in struct page | |
855 | * which is not yet initialized. Instead, we find nid from memory block. | |
856 | */ | |
857 | mem = find_memory_block(__pfn_to_section(pfn)); | |
858 | nid = mem->nid; | |
7b78d335 | 859 | |
f1dd2cd1 MH |
860 | /* associate pfn range with the zone */ |
861 | zone = move_pfn_range(online_type, nid, pfn, nr_pages); | |
862 | ||
7b78d335 YG |
863 | arg.start_pfn = pfn; |
864 | arg.nr_pages = nr_pages; | |
d9713679 | 865 | node_states_check_changes_online(nr_pages, zone, &arg); |
7b78d335 | 866 | |
7b78d335 YG |
867 | ret = memory_notify(MEM_GOING_ONLINE, &arg); |
868 | ret = notifier_to_errno(ret); | |
e33e33b4 CY |
869 | if (ret) |
870 | goto failed_addition; | |
871 | ||
6811378e YG |
872 | /* |
873 | * If this zone is not populated, then it is not in zonelist. | |
874 | * This means the page allocator ignores this zone. | |
875 | * So, zonelist must be updated after online. | |
876 | */ | |
6dcd73d7 | 877 | if (!populated_zone(zone)) { |
6811378e | 878 | need_zonelists_rebuild = 1; |
72675e13 | 879 | setup_zone_pageset(zone); |
6dcd73d7 | 880 | } |
6811378e | 881 | |
908eedc6 | 882 | ret = walk_system_ram_range(pfn, nr_pages, &onlined_pages, |
75884fb1 | 883 | online_pages_range); |
fd8a4221 | 884 | if (ret) { |
6dcd73d7 WC |
885 | if (need_zonelists_rebuild) |
886 | zone_pcp_reset(zone); | |
e33e33b4 | 887 | goto failed_addition; |
fd8a4221 GL |
888 | } |
889 | ||
3947be19 | 890 | zone->present_pages += onlined_pages; |
aa47228a CS |
891 | |
892 | pgdat_resize_lock(zone->zone_pgdat, &flags); | |
f2937be5 | 893 | zone->zone_pgdat->node_present_pages += onlined_pages; |
aa47228a CS |
894 | pgdat_resize_unlock(zone->zone_pgdat, &flags); |
895 | ||
08dff7b7 | 896 | if (onlined_pages) { |
e888ca35 | 897 | node_states_set_node(nid, &arg); |
08dff7b7 | 898 | if (need_zonelists_rebuild) |
72675e13 | 899 | build_all_zonelists(NULL); |
08dff7b7 JL |
900 | else |
901 | zone_pcp_update(zone); | |
902 | } | |
3947be19 | 903 | |
1b79acc9 KM |
904 | init_per_zone_wmark_min(); |
905 | ||
698b1b30 | 906 | if (onlined_pages) { |
e888ca35 | 907 | kswapd_run(nid); |
698b1b30 VB |
908 | kcompactd_run(nid); |
909 | } | |
61b13993 | 910 | |
1f522509 | 911 | vm_total_pages = nr_free_pagecache_pages(); |
2f7f24ec | 912 | |
2d1d43f6 | 913 | writeback_set_ratelimit(); |
7b78d335 YG |
914 | |
915 | if (onlined_pages) | |
916 | memory_notify(MEM_ONLINE, &arg); | |
30467e0b | 917 | return 0; |
e33e33b4 CY |
918 | |
919 | failed_addition: | |
920 | pr_debug("online_pages [mem %#010llx-%#010llx] failed\n", | |
921 | (unsigned long long) pfn << PAGE_SHIFT, | |
922 | (((unsigned long long) pfn + nr_pages) << PAGE_SHIFT) - 1); | |
923 | memory_notify(MEM_CANCEL_ONLINE, &arg); | |
924 | return ret; | |
3947be19 | 925 | } |
53947027 | 926 | #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ |
bc02af93 | 927 | |
0bd85420 TC |
928 | static void reset_node_present_pages(pg_data_t *pgdat) |
929 | { | |
930 | struct zone *z; | |
931 | ||
932 | for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++) | |
933 | z->present_pages = 0; | |
934 | ||
935 | pgdat->node_present_pages = 0; | |
936 | } | |
937 | ||
e1319331 HS |
938 | /* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */ |
939 | static pg_data_t __ref *hotadd_new_pgdat(int nid, u64 start) | |
9af3c2de YG |
940 | { |
941 | struct pglist_data *pgdat; | |
c8e861a5 | 942 | unsigned long start_pfn = PFN_DOWN(start); |
9af3c2de | 943 | |
a1e565aa TC |
944 | pgdat = NODE_DATA(nid); |
945 | if (!pgdat) { | |
946 | pgdat = arch_alloc_nodedata(nid); | |
947 | if (!pgdat) | |
948 | return NULL; | |
9af3c2de | 949 | |
a1e565aa | 950 | arch_refresh_nodedata(nid, pgdat); |
b0dc3a34 | 951 | } else { |
e716f2eb MG |
952 | /* |
953 | * Reset the nr_zones, order and classzone_idx before reuse. | |
954 | * Note that kswapd will init kswapd_classzone_idx properly | |
955 | * when it starts in the near future. | |
956 | */ | |
b0dc3a34 | 957 | pgdat->nr_zones = 0; |
38087d9b MG |
958 | pgdat->kswapd_order = 0; |
959 | pgdat->kswapd_classzone_idx = 0; | |
a1e565aa | 960 | } |
9af3c2de YG |
961 | |
962 | /* we can use NODE_DATA(nid) from here */ | |
963 | ||
03e85f9d OS |
964 | pgdat->node_id = nid; |
965 | pgdat->node_start_pfn = start_pfn; | |
966 | ||
9af3c2de | 967 | /* init node's zones as empty zones, we don't have any present pages.*/ |
03e85f9d | 968 | free_area_init_core_hotplug(nid); |
5830169f | 969 | pgdat->per_cpu_nodestats = alloc_percpu(struct per_cpu_nodestat); |
9af3c2de | 970 | |
959ecc48 KH |
971 | /* |
972 | * The node we allocated has no zone fallback lists. For avoiding | |
973 | * to access not-initialized zonelist, build here. | |
974 | */ | |
72675e13 | 975 | build_all_zonelists(pgdat); |
959ecc48 | 976 | |
0bd85420 TC |
977 | /* |
978 | * When memory is hot-added, all the memory is in offline state. So | |
979 | * clear all zones' present_pages because they will be updated in | |
980 | * online_pages() and offline_pages(). | |
981 | */ | |
03e85f9d | 982 | reset_node_managed_pages(pgdat); |
0bd85420 TC |
983 | reset_node_present_pages(pgdat); |
984 | ||
9af3c2de YG |
985 | return pgdat; |
986 | } | |
987 | ||
b9ff0360 | 988 | static void rollback_node_hotadd(int nid) |
9af3c2de | 989 | { |
b9ff0360 OS |
990 | pg_data_t *pgdat = NODE_DATA(nid); |
991 | ||
9af3c2de | 992 | arch_refresh_nodedata(nid, NULL); |
5830169f | 993 | free_percpu(pgdat->per_cpu_nodestats); |
9af3c2de YG |
994 | arch_free_nodedata(pgdat); |
995 | return; | |
996 | } | |
997 | ||
0a547039 | 998 | |
01b0f197 TK |
999 | /** |
1000 | * try_online_node - online a node if offlined | |
e8b098fc | 1001 | * @nid: the node ID |
b9ff0360 OS |
1002 | * @start: start addr of the node |
1003 | * @set_node_online: Whether we want to online the node | |
cf23422b | 1004 | * called by cpu_up() to online a node without onlined memory. |
b9ff0360 OS |
1005 | * |
1006 | * Returns: | |
1007 | * 1 -> a new node has been allocated | |
1008 | * 0 -> the node is already online | |
1009 | * -ENOMEM -> the node could not be allocated | |
cf23422b | 1010 | */ |
b9ff0360 | 1011 | static int __try_online_node(int nid, u64 start, bool set_node_online) |
cf23422b | 1012 | { |
b9ff0360 OS |
1013 | pg_data_t *pgdat; |
1014 | int ret = 1; | |
cf23422b | 1015 | |
01b0f197 TK |
1016 | if (node_online(nid)) |
1017 | return 0; | |
1018 | ||
b9ff0360 | 1019 | pgdat = hotadd_new_pgdat(nid, start); |
7553e8f2 | 1020 | if (!pgdat) { |
01b0f197 | 1021 | pr_err("Cannot online node %d due to NULL pgdat\n", nid); |
cf23422b | 1022 | ret = -ENOMEM; |
1023 | goto out; | |
1024 | } | |
b9ff0360 OS |
1025 | |
1026 | if (set_node_online) { | |
1027 | node_set_online(nid); | |
1028 | ret = register_one_node(nid); | |
1029 | BUG_ON(ret); | |
1030 | } | |
cf23422b | 1031 | out: |
b9ff0360 OS |
1032 | return ret; |
1033 | } | |
1034 | ||
1035 | /* | |
1036 | * Users of this function always want to online/register the node | |
1037 | */ | |
1038 | int try_online_node(int nid) | |
1039 | { | |
1040 | int ret; | |
1041 | ||
1042 | mem_hotplug_begin(); | |
1043 | ret = __try_online_node(nid, 0, true); | |
bfc8c901 | 1044 | mem_hotplug_done(); |
cf23422b | 1045 | return ret; |
1046 | } | |
1047 | ||
27356f54 TK |
1048 | static int check_hotplug_memory_range(u64 start, u64 size) |
1049 | { | |
ba325585 PT |
1050 | unsigned long block_sz = memory_block_size_bytes(); |
1051 | u64 block_nr_pages = block_sz >> PAGE_SHIFT; | |
27356f54 | 1052 | u64 nr_pages = size >> PAGE_SHIFT; |
ba325585 | 1053 | u64 start_pfn = PFN_DOWN(start); |
27356f54 | 1054 | |
ba325585 PT |
1055 | /* memory range must be block size aligned */ |
1056 | if (!nr_pages || !IS_ALIGNED(start_pfn, block_nr_pages) || | |
1057 | !IS_ALIGNED(nr_pages, block_nr_pages)) { | |
1058 | pr_err("Block size [%#lx] unaligned hotplug range: start %#llx, size %#llx", | |
1059 | block_sz, start, size); | |
27356f54 TK |
1060 | return -EINVAL; |
1061 | } | |
1062 | ||
1063 | return 0; | |
1064 | } | |
1065 | ||
31bc3858 VK |
1066 | static int online_memory_block(struct memory_block *mem, void *arg) |
1067 | { | |
dc18d706 | 1068 | return device_online(&mem->dev); |
31bc3858 VK |
1069 | } |
1070 | ||
31168481 | 1071 | /* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */ |
31bc3858 | 1072 | int __ref add_memory_resource(int nid, struct resource *res, bool online) |
bc02af93 | 1073 | { |
62cedb9f | 1074 | u64 start, size; |
b9ff0360 | 1075 | bool new_node = false; |
bc02af93 YG |
1076 | int ret; |
1077 | ||
62cedb9f DV |
1078 | start = res->start; |
1079 | size = resource_size(res); | |
1080 | ||
27356f54 TK |
1081 | ret = check_hotplug_memory_range(start, size); |
1082 | if (ret) | |
1083 | return ret; | |
1084 | ||
bfc8c901 | 1085 | mem_hotplug_begin(); |
ac13c462 | 1086 | |
7f36e3e5 TC |
1087 | /* |
1088 | * Add new range to memblock so that when hotadd_new_pgdat() is called | |
1089 | * to allocate new pgdat, get_pfn_range_for_nid() will be able to find | |
1090 | * this new range and calculate total pages correctly. The range will | |
1091 | * be removed at hot-remove time. | |
1092 | */ | |
1093 | memblock_add_node(start, size, nid); | |
1094 | ||
b9ff0360 OS |
1095 | ret = __try_online_node(nid, start, false); |
1096 | if (ret < 0) | |
1097 | goto error; | |
1098 | new_node = ret; | |
9af3c2de | 1099 | |
bc02af93 | 1100 | /* call arch's memory hotadd */ |
24e6d5a5 | 1101 | ret = arch_add_memory(nid, start, size, NULL, true); |
9af3c2de YG |
1102 | if (ret < 0) |
1103 | goto error; | |
1104 | ||
a1e565aa | 1105 | if (new_node) { |
d5b6f6a3 | 1106 | /* If sysfs file of new node can't be created, cpu on the node |
0fc44159 YG |
1107 | * can't be hot-added. There is no rollback way now. |
1108 | * So, check by BUG_ON() to catch it reluctantly.. | |
d5b6f6a3 | 1109 | * We online node here. We can't roll back from here. |
0fc44159 | 1110 | */ |
d5b6f6a3 OS |
1111 | node_set_online(nid); |
1112 | ret = __register_one_node(nid); | |
0fc44159 YG |
1113 | BUG_ON(ret); |
1114 | } | |
1115 | ||
d5b6f6a3 | 1116 | /* link memory sections under this node.*/ |
4fbce633 | 1117 | ret = link_mem_sections(nid, PFN_DOWN(start), PFN_UP(start + size - 1)); |
d5b6f6a3 OS |
1118 | BUG_ON(ret); |
1119 | ||
d96ae530 | 1120 | /* create new memmap entry */ |
1121 | firmware_map_add_hotplug(start, start + size, "System RAM"); | |
1122 | ||
31bc3858 VK |
1123 | /* online pages if requested */ |
1124 | if (online) | |
1125 | walk_memory_range(PFN_DOWN(start), PFN_UP(start + size - 1), | |
1126 | NULL, online_memory_block); | |
1127 | ||
6ad696d2 AK |
1128 | goto out; |
1129 | ||
9af3c2de YG |
1130 | error: |
1131 | /* rollback pgdat allocation and others */ | |
b9ff0360 OS |
1132 | if (new_node) |
1133 | rollback_node_hotadd(nid); | |
7f36e3e5 | 1134 | memblock_remove(start, size); |
9af3c2de | 1135 | |
6ad696d2 | 1136 | out: |
bfc8c901 | 1137 | mem_hotplug_done(); |
bc02af93 YG |
1138 | return ret; |
1139 | } | |
62cedb9f DV |
1140 | EXPORT_SYMBOL_GPL(add_memory_resource); |
1141 | ||
1142 | int __ref add_memory(int nid, u64 start, u64 size) | |
1143 | { | |
1144 | struct resource *res; | |
1145 | int ret; | |
1146 | ||
1147 | res = register_memory_resource(start, size); | |
6f754ba4 VK |
1148 | if (IS_ERR(res)) |
1149 | return PTR_ERR(res); | |
62cedb9f | 1150 | |
31bc3858 | 1151 | ret = add_memory_resource(nid, res, memhp_auto_online); |
62cedb9f DV |
1152 | if (ret < 0) |
1153 | release_memory_resource(res); | |
1154 | return ret; | |
1155 | } | |
bc02af93 | 1156 | EXPORT_SYMBOL_GPL(add_memory); |
0c0e6195 KH |
1157 | |
1158 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
5c755e9f BP |
1159 | /* |
1160 | * A free page on the buddy free lists (not the per-cpu lists) has PageBuddy | |
1161 | * set and the size of the free page is given by page_order(). Using this, | |
1162 | * the function determines if the pageblock contains only free pages. | |
1163 | * Due to buddy contraints, a free page at least the size of a pageblock will | |
1164 | * be located at the start of the pageblock | |
1165 | */ | |
1166 | static inline int pageblock_free(struct page *page) | |
1167 | { | |
1168 | return PageBuddy(page) && page_order(page) >= pageblock_order; | |
1169 | } | |
1170 | ||
1171 | /* Return the start of the next active pageblock after a given page */ | |
1172 | static struct page *next_active_pageblock(struct page *page) | |
1173 | { | |
5c755e9f BP |
1174 | /* Ensure the starting page is pageblock-aligned */ |
1175 | BUG_ON(page_to_pfn(page) & (pageblock_nr_pages - 1)); | |
1176 | ||
5c755e9f | 1177 | /* If the entire pageblock is free, move to the end of free page */ |
0dcc48c1 KH |
1178 | if (pageblock_free(page)) { |
1179 | int order; | |
1180 | /* be careful. we don't have locks, page_order can be changed.*/ | |
1181 | order = page_order(page); | |
1182 | if ((order < MAX_ORDER) && (order >= pageblock_order)) | |
1183 | return page + (1 << order); | |
1184 | } | |
5c755e9f | 1185 | |
0dcc48c1 | 1186 | return page + pageblock_nr_pages; |
5c755e9f BP |
1187 | } |
1188 | ||
fb52bbae MM |
1189 | static bool is_pageblock_removable_nolock(struct page *page) |
1190 | { | |
1191 | struct zone *zone; | |
1192 | unsigned long pfn; | |
1193 | ||
1194 | /* | |
1195 | * We have to be careful here because we are iterating over memory | |
1196 | * sections which are not zone aware so we might end up outside of | |
1197 | * the zone but still within the section. | |
1198 | * We have to take care about the node as well. If the node is offline | |
1199 | * its NODE_DATA will be NULL - see page_zone. | |
1200 | */ | |
1201 | if (!node_online(page_to_nid(page))) | |
1202 | return false; | |
1203 | ||
1204 | zone = page_zone(page); | |
1205 | pfn = page_to_pfn(page); | |
1206 | if (!zone_spans_pfn(zone, pfn)) | |
1207 | return false; | |
1208 | ||
1209 | return !has_unmovable_pages(zone, page, 0, MIGRATE_MOVABLE, true); | |
1210 | } | |
1211 | ||
5c755e9f | 1212 | /* Checks if this range of memory is likely to be hot-removable. */ |
c98940f6 | 1213 | bool is_mem_section_removable(unsigned long start_pfn, unsigned long nr_pages) |
5c755e9f | 1214 | { |
5c755e9f BP |
1215 | struct page *page = pfn_to_page(start_pfn); |
1216 | struct page *end_page = page + nr_pages; | |
1217 | ||
1218 | /* Check the starting page of each pageblock within the range */ | |
1219 | for (; page < end_page; page = next_active_pageblock(page)) { | |
49ac8255 | 1220 | if (!is_pageblock_removable_nolock(page)) |
c98940f6 | 1221 | return false; |
49ac8255 | 1222 | cond_resched(); |
5c755e9f BP |
1223 | } |
1224 | ||
1225 | /* All pageblocks in the memory block are likely to be hot-removable */ | |
c98940f6 | 1226 | return true; |
5c755e9f BP |
1227 | } |
1228 | ||
0c0e6195 | 1229 | /* |
deb88a2a | 1230 | * Confirm all pages in a range [start, end) belong to the same zone. |
a96dfddb | 1231 | * When true, return its valid [start, end). |
0c0e6195 | 1232 | */ |
a96dfddb TK |
1233 | int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn, |
1234 | unsigned long *valid_start, unsigned long *valid_end) | |
0c0e6195 | 1235 | { |
5f0f2887 | 1236 | unsigned long pfn, sec_end_pfn; |
a96dfddb | 1237 | unsigned long start, end; |
0c0e6195 KH |
1238 | struct zone *zone = NULL; |
1239 | struct page *page; | |
1240 | int i; | |
deb88a2a | 1241 | for (pfn = start_pfn, sec_end_pfn = SECTION_ALIGN_UP(start_pfn + 1); |
0c0e6195 | 1242 | pfn < end_pfn; |
deb88a2a | 1243 | pfn = sec_end_pfn, sec_end_pfn += PAGES_PER_SECTION) { |
5f0f2887 AB |
1244 | /* Make sure the memory section is present first */ |
1245 | if (!present_section_nr(pfn_to_section_nr(pfn))) | |
0c0e6195 | 1246 | continue; |
5f0f2887 AB |
1247 | for (; pfn < sec_end_pfn && pfn < end_pfn; |
1248 | pfn += MAX_ORDER_NR_PAGES) { | |
1249 | i = 0; | |
1250 | /* This is just a CONFIG_HOLES_IN_ZONE check.*/ | |
1251 | while ((i < MAX_ORDER_NR_PAGES) && | |
1252 | !pfn_valid_within(pfn + i)) | |
1253 | i++; | |
d6d8c8a4 | 1254 | if (i == MAX_ORDER_NR_PAGES || pfn + i >= end_pfn) |
5f0f2887 AB |
1255 | continue; |
1256 | page = pfn_to_page(pfn + i); | |
1257 | if (zone && page_zone(page) != zone) | |
1258 | return 0; | |
a96dfddb TK |
1259 | if (!zone) |
1260 | start = pfn + i; | |
5f0f2887 | 1261 | zone = page_zone(page); |
a96dfddb | 1262 | end = pfn + MAX_ORDER_NR_PAGES; |
5f0f2887 | 1263 | } |
0c0e6195 | 1264 | } |
deb88a2a | 1265 | |
a96dfddb TK |
1266 | if (zone) { |
1267 | *valid_start = start; | |
d6d8c8a4 | 1268 | *valid_end = min(end, end_pfn); |
deb88a2a | 1269 | return 1; |
a96dfddb | 1270 | } else { |
deb88a2a | 1271 | return 0; |
a96dfddb | 1272 | } |
0c0e6195 KH |
1273 | } |
1274 | ||
1275 | /* | |
0efadf48 YX |
1276 | * Scan pfn range [start,end) to find movable/migratable pages (LRU pages, |
1277 | * non-lru movable pages and hugepages). We scan pfn because it's much | |
1278 | * easier than scanning over linked list. This function returns the pfn | |
1279 | * of the first found movable page if it's found, otherwise 0. | |
0c0e6195 | 1280 | */ |
c8721bbb | 1281 | static unsigned long scan_movable_pages(unsigned long start, unsigned long end) |
0c0e6195 KH |
1282 | { |
1283 | unsigned long pfn; | |
1284 | struct page *page; | |
1285 | for (pfn = start; pfn < end; pfn++) { | |
1286 | if (pfn_valid(pfn)) { | |
1287 | page = pfn_to_page(pfn); | |
1288 | if (PageLRU(page)) | |
1289 | return pfn; | |
0efadf48 YX |
1290 | if (__PageMovable(page)) |
1291 | return pfn; | |
c8721bbb | 1292 | if (PageHuge(page)) { |
464c7ffb AK |
1293 | if (hugepage_migration_supported(page_hstate(page)) && |
1294 | page_huge_active(page)) | |
c8721bbb NH |
1295 | return pfn; |
1296 | else | |
1297 | pfn = round_up(pfn + 1, | |
1298 | 1 << compound_order(page)) - 1; | |
1299 | } | |
0c0e6195 KH |
1300 | } |
1301 | } | |
1302 | return 0; | |
1303 | } | |
1304 | ||
666feb21 | 1305 | static struct page *new_node_page(struct page *page, unsigned long private) |
394e31d2 | 1306 | { |
394e31d2 | 1307 | int nid = page_to_nid(page); |
231e97e2 | 1308 | nodemask_t nmask = node_states[N_MEMORY]; |
7f252f27 MH |
1309 | |
1310 | /* | |
1311 | * try to allocate from a different node but reuse this node if there | |
1312 | * are no other online nodes to be used (e.g. we are offlining a part | |
1313 | * of the only existing node) | |
1314 | */ | |
1315 | node_clear(nid, nmask); | |
1316 | if (nodes_empty(nmask)) | |
1317 | node_set(nid, nmask); | |
394e31d2 | 1318 | |
8b913238 | 1319 | return new_page_nodemask(page, nid, &nmask); |
394e31d2 XQ |
1320 | } |
1321 | ||
0c0e6195 KH |
1322 | #define NR_OFFLINE_AT_ONCE_PAGES (256) |
1323 | static int | |
1324 | do_migrate_range(unsigned long start_pfn, unsigned long end_pfn) | |
1325 | { | |
1326 | unsigned long pfn; | |
1327 | struct page *page; | |
1328 | int move_pages = NR_OFFLINE_AT_ONCE_PAGES; | |
1329 | int not_managed = 0; | |
1330 | int ret = 0; | |
1331 | LIST_HEAD(source); | |
1332 | ||
1333 | for (pfn = start_pfn; pfn < end_pfn && move_pages > 0; pfn++) { | |
1334 | if (!pfn_valid(pfn)) | |
1335 | continue; | |
1336 | page = pfn_to_page(pfn); | |
c8721bbb NH |
1337 | |
1338 | if (PageHuge(page)) { | |
1339 | struct page *head = compound_head(page); | |
1340 | pfn = page_to_pfn(head) + (1<<compound_order(head)) - 1; | |
1341 | if (compound_order(head) > PFN_SECTION_SHIFT) { | |
1342 | ret = -EBUSY; | |
1343 | break; | |
1344 | } | |
1345 | if (isolate_huge_page(page, &source)) | |
1346 | move_pages -= 1 << compound_order(head); | |
1347 | continue; | |
94723aaf | 1348 | } else if (PageTransHuge(page)) |
8135d892 NH |
1349 | pfn = page_to_pfn(compound_head(page)) |
1350 | + hpage_nr_pages(page) - 1; | |
c8721bbb | 1351 | |
700c2a46 | 1352 | if (!get_page_unless_zero(page)) |
0c0e6195 KH |
1353 | continue; |
1354 | /* | |
0efadf48 YX |
1355 | * We can skip free pages. And we can deal with pages on |
1356 | * LRU and non-lru movable pages. | |
0c0e6195 | 1357 | */ |
0efadf48 YX |
1358 | if (PageLRU(page)) |
1359 | ret = isolate_lru_page(page); | |
1360 | else | |
1361 | ret = isolate_movable_page(page, ISOLATE_UNEVICTABLE); | |
0c0e6195 | 1362 | if (!ret) { /* Success */ |
700c2a46 | 1363 | put_page(page); |
62695a84 | 1364 | list_add_tail(&page->lru, &source); |
0c0e6195 | 1365 | move_pages--; |
0efadf48 YX |
1366 | if (!__PageMovable(page)) |
1367 | inc_node_page_state(page, NR_ISOLATED_ANON + | |
1368 | page_is_file_cache(page)); | |
6d9c285a | 1369 | |
0c0e6195 | 1370 | } else { |
0c0e6195 | 1371 | #ifdef CONFIG_DEBUG_VM |
0efadf48 YX |
1372 | pr_alert("failed to isolate pfn %lx\n", pfn); |
1373 | dump_page(page, "isolation failed"); | |
0c0e6195 | 1374 | #endif |
700c2a46 | 1375 | put_page(page); |
25985edc | 1376 | /* Because we don't have big zone->lock. we should |
809c4449 BL |
1377 | check this again here. */ |
1378 | if (page_count(page)) { | |
1379 | not_managed++; | |
f3ab2636 | 1380 | ret = -EBUSY; |
809c4449 BL |
1381 | break; |
1382 | } | |
0c0e6195 KH |
1383 | } |
1384 | } | |
f3ab2636 BL |
1385 | if (!list_empty(&source)) { |
1386 | if (not_managed) { | |
c8721bbb | 1387 | putback_movable_pages(&source); |
f3ab2636 BL |
1388 | goto out; |
1389 | } | |
74c08f98 | 1390 | |
394e31d2 XQ |
1391 | /* Allocate a new page from the nearest neighbor node */ |
1392 | ret = migrate_pages(&source, new_node_page, NULL, 0, | |
9c620e2b | 1393 | MIGRATE_SYNC, MR_MEMORY_HOTPLUG); |
f3ab2636 | 1394 | if (ret) |
c8721bbb | 1395 | putback_movable_pages(&source); |
0c0e6195 | 1396 | } |
0c0e6195 KH |
1397 | out: |
1398 | return ret; | |
1399 | } | |
1400 | ||
1401 | /* | |
1402 | * remove from free_area[] and mark all as Reserved. | |
1403 | */ | |
1404 | static int | |
1405 | offline_isolated_pages_cb(unsigned long start, unsigned long nr_pages, | |
1406 | void *data) | |
1407 | { | |
1408 | __offline_isolated_pages(start, start + nr_pages); | |
1409 | return 0; | |
1410 | } | |
1411 | ||
1412 | static void | |
1413 | offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn) | |
1414 | { | |
908eedc6 | 1415 | walk_system_ram_range(start_pfn, end_pfn - start_pfn, NULL, |
0c0e6195 KH |
1416 | offline_isolated_pages_cb); |
1417 | } | |
1418 | ||
1419 | /* | |
1420 | * Check all pages in range, recoreded as memory resource, are isolated. | |
1421 | */ | |
1422 | static int | |
1423 | check_pages_isolated_cb(unsigned long start_pfn, unsigned long nr_pages, | |
1424 | void *data) | |
1425 | { | |
1426 | int ret; | |
1427 | long offlined = *(long *)data; | |
b023f468 | 1428 | ret = test_pages_isolated(start_pfn, start_pfn + nr_pages, true); |
0c0e6195 KH |
1429 | offlined = nr_pages; |
1430 | if (!ret) | |
1431 | *(long *)data += offlined; | |
1432 | return ret; | |
1433 | } | |
1434 | ||
1435 | static long | |
1436 | check_pages_isolated(unsigned long start_pfn, unsigned long end_pfn) | |
1437 | { | |
1438 | long offlined = 0; | |
1439 | int ret; | |
1440 | ||
908eedc6 | 1441 | ret = walk_system_ram_range(start_pfn, end_pfn - start_pfn, &offlined, |
0c0e6195 KH |
1442 | check_pages_isolated_cb); |
1443 | if (ret < 0) | |
1444 | offlined = (long)ret; | |
1445 | return offlined; | |
1446 | } | |
1447 | ||
c5320926 TC |
1448 | static int __init cmdline_parse_movable_node(char *p) |
1449 | { | |
4932381e | 1450 | #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP |
55ac590c | 1451 | movable_node_enabled = true; |
4932381e MH |
1452 | #else |
1453 | pr_warn("movable_node parameter depends on CONFIG_HAVE_MEMBLOCK_NODE_MAP to work properly\n"); | |
1454 | #endif | |
c5320926 TC |
1455 | return 0; |
1456 | } | |
1457 | early_param("movable_node", cmdline_parse_movable_node); | |
1458 | ||
d9713679 LJ |
1459 | /* check which state of node_states will be changed when offline memory */ |
1460 | static void node_states_check_changes_offline(unsigned long nr_pages, | |
1461 | struct zone *zone, struct memory_notify *arg) | |
1462 | { | |
1463 | struct pglist_data *pgdat = zone->zone_pgdat; | |
1464 | unsigned long present_pages = 0; | |
86b27bea | 1465 | enum zone_type zt; |
d9713679 | 1466 | |
86b27bea OS |
1467 | arg->status_change_nid = -1; |
1468 | arg->status_change_nid_normal = -1; | |
1469 | arg->status_change_nid_high = -1; | |
d9713679 LJ |
1470 | |
1471 | /* | |
86b27bea OS |
1472 | * Check whether node_states[N_NORMAL_MEMORY] will be changed. |
1473 | * If the memory to be offline is within the range | |
1474 | * [0..ZONE_NORMAL], and it is the last present memory there, | |
1475 | * the zones in that range will become empty after the offlining, | |
1476 | * thus we can determine that we need to clear the node from | |
1477 | * node_states[N_NORMAL_MEMORY]. | |
d9713679 | 1478 | */ |
86b27bea | 1479 | for (zt = 0; zt <= ZONE_NORMAL; zt++) |
d9713679 | 1480 | present_pages += pgdat->node_zones[zt].present_pages; |
86b27bea | 1481 | if (zone_idx(zone) <= ZONE_NORMAL && nr_pages >= present_pages) |
d9713679 | 1482 | arg->status_change_nid_normal = zone_to_nid(zone); |
d9713679 | 1483 | |
6715ddf9 LJ |
1484 | #ifdef CONFIG_HIGHMEM |
1485 | /* | |
86b27bea OS |
1486 | * node_states[N_HIGH_MEMORY] contains nodes which |
1487 | * have normal memory or high memory. | |
1488 | * Here we add the present_pages belonging to ZONE_HIGHMEM. | |
1489 | * If the zone is within the range of [0..ZONE_HIGHMEM), and | |
1490 | * we determine that the zones in that range become empty, | |
1491 | * we need to clear the node for N_HIGH_MEMORY. | |
6715ddf9 | 1492 | */ |
86b27bea OS |
1493 | present_pages += pgdat->node_zones[ZONE_HIGHMEM].present_pages; |
1494 | if (zone_idx(zone) <= ZONE_HIGHMEM && nr_pages >= present_pages) | |
6715ddf9 | 1495 | arg->status_change_nid_high = zone_to_nid(zone); |
6715ddf9 LJ |
1496 | #endif |
1497 | ||
d9713679 | 1498 | /* |
86b27bea OS |
1499 | * We have accounted the pages from [0..ZONE_NORMAL), and |
1500 | * in case of CONFIG_HIGHMEM the pages from ZONE_HIGHMEM | |
1501 | * as well. | |
1502 | * Here we count the possible pages from ZONE_MOVABLE. | |
1503 | * If after having accounted all the pages, we see that the nr_pages | |
1504 | * to be offlined is over or equal to the accounted pages, | |
1505 | * we know that the node will become empty, and so, we can clear | |
1506 | * it for N_MEMORY as well. | |
d9713679 | 1507 | */ |
86b27bea | 1508 | present_pages += pgdat->node_zones[ZONE_MOVABLE].present_pages; |
d9713679 | 1509 | |
d9713679 LJ |
1510 | if (nr_pages >= present_pages) |
1511 | arg->status_change_nid = zone_to_nid(zone); | |
d9713679 LJ |
1512 | } |
1513 | ||
1514 | static void node_states_clear_node(int node, struct memory_notify *arg) | |
1515 | { | |
1516 | if (arg->status_change_nid_normal >= 0) | |
1517 | node_clear_state(node, N_NORMAL_MEMORY); | |
1518 | ||
cf01f6f5 | 1519 | if (arg->status_change_nid_high >= 0) |
d9713679 | 1520 | node_clear_state(node, N_HIGH_MEMORY); |
6715ddf9 | 1521 | |
cf01f6f5 | 1522 | if (arg->status_change_nid >= 0) |
6715ddf9 | 1523 | node_clear_state(node, N_MEMORY); |
d9713679 LJ |
1524 | } |
1525 | ||
a16cee10 | 1526 | static int __ref __offline_pages(unsigned long start_pfn, |
ecde0f3e | 1527 | unsigned long end_pfn) |
0c0e6195 | 1528 | { |
ecde0f3e | 1529 | unsigned long pfn, nr_pages; |
0c0e6195 | 1530 | long offlined_pages; |
72b39cfc | 1531 | int ret, node; |
d702909f | 1532 | unsigned long flags; |
a96dfddb | 1533 | unsigned long valid_start, valid_end; |
0c0e6195 | 1534 | struct zone *zone; |
7b78d335 | 1535 | struct memory_notify arg; |
0c0e6195 | 1536 | |
0c0e6195 KH |
1537 | /* at least, alignment against pageblock is necessary */ |
1538 | if (!IS_ALIGNED(start_pfn, pageblock_nr_pages)) | |
1539 | return -EINVAL; | |
1540 | if (!IS_ALIGNED(end_pfn, pageblock_nr_pages)) | |
1541 | return -EINVAL; | |
1542 | /* This makes hotplug much easier...and readable. | |
1543 | we assume this for now. .*/ | |
a96dfddb | 1544 | if (!test_pages_in_a_zone(start_pfn, end_pfn, &valid_start, &valid_end)) |
0c0e6195 | 1545 | return -EINVAL; |
7b78d335 | 1546 | |
a96dfddb | 1547 | zone = page_zone(pfn_to_page(valid_start)); |
7b78d335 YG |
1548 | node = zone_to_nid(zone); |
1549 | nr_pages = end_pfn - start_pfn; | |
1550 | ||
0c0e6195 | 1551 | /* set above range as isolated */ |
b023f468 WC |
1552 | ret = start_isolate_page_range(start_pfn, end_pfn, |
1553 | MIGRATE_MOVABLE, true); | |
0c0e6195 | 1554 | if (ret) |
30467e0b | 1555 | return ret; |
7b78d335 YG |
1556 | |
1557 | arg.start_pfn = start_pfn; | |
1558 | arg.nr_pages = nr_pages; | |
d9713679 | 1559 | node_states_check_changes_offline(nr_pages, zone, &arg); |
7b78d335 YG |
1560 | |
1561 | ret = memory_notify(MEM_GOING_OFFLINE, &arg); | |
1562 | ret = notifier_to_errno(ret); | |
1563 | if (ret) | |
1564 | goto failed_removal; | |
1565 | ||
0c0e6195 | 1566 | pfn = start_pfn; |
0c0e6195 KH |
1567 | repeat: |
1568 | /* start memory hot removal */ | |
0c0e6195 KH |
1569 | ret = -EINTR; |
1570 | if (signal_pending(current)) | |
1571 | goto failed_removal; | |
72b39cfc MH |
1572 | |
1573 | cond_resched(); | |
9852a721 | 1574 | lru_add_drain_all(); |
72b39cfc | 1575 | drain_all_pages(zone); |
0c0e6195 | 1576 | |
c8721bbb NH |
1577 | pfn = scan_movable_pages(start_pfn, end_pfn); |
1578 | if (pfn) { /* We have movable pages */ | |
0c0e6195 | 1579 | ret = do_migrate_range(pfn, end_pfn); |
72b39cfc | 1580 | goto repeat; |
0c0e6195 | 1581 | } |
72b39cfc | 1582 | |
c8721bbb NH |
1583 | /* |
1584 | * dissolve free hugepages in the memory block before doing offlining | |
1585 | * actually in order to make hugetlbfs's object counting consistent. | |
1586 | */ | |
082d5b6b GS |
1587 | ret = dissolve_free_huge_pages(start_pfn, end_pfn); |
1588 | if (ret) | |
1589 | goto failed_removal; | |
0c0e6195 KH |
1590 | /* check again */ |
1591 | offlined_pages = check_pages_isolated(start_pfn, end_pfn); | |
72b39cfc MH |
1592 | if (offlined_pages < 0) |
1593 | goto repeat; | |
e33e33b4 | 1594 | pr_info("Offlined Pages %ld\n", offlined_pages); |
b3834be5 | 1595 | /* Ok, all of our target is isolated. |
0c0e6195 KH |
1596 | We cannot do rollback at this point. */ |
1597 | offline_isolated_pages(start_pfn, end_pfn); | |
dbc0e4ce | 1598 | /* reset pagetype flags and makes migrate type to be MOVABLE */ |
0815f3d8 | 1599 | undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE); |
0c0e6195 | 1600 | /* removal success */ |
3dcc0571 | 1601 | adjust_managed_page_count(pfn_to_page(start_pfn), -offlined_pages); |
0c0e6195 | 1602 | zone->present_pages -= offlined_pages; |
d702909f CS |
1603 | |
1604 | pgdat_resize_lock(zone->zone_pgdat, &flags); | |
0c0e6195 | 1605 | zone->zone_pgdat->node_present_pages -= offlined_pages; |
d702909f | 1606 | pgdat_resize_unlock(zone->zone_pgdat, &flags); |
7b78d335 | 1607 | |
1b79acc9 KM |
1608 | init_per_zone_wmark_min(); |
1609 | ||
1e8537ba | 1610 | if (!populated_zone(zone)) { |
340175b7 | 1611 | zone_pcp_reset(zone); |
72675e13 | 1612 | build_all_zonelists(NULL); |
1e8537ba XQ |
1613 | } else |
1614 | zone_pcp_update(zone); | |
340175b7 | 1615 | |
d9713679 | 1616 | node_states_clear_node(node, &arg); |
698b1b30 | 1617 | if (arg.status_change_nid >= 0) { |
8fe23e05 | 1618 | kswapd_stop(node); |
698b1b30 VB |
1619 | kcompactd_stop(node); |
1620 | } | |
bce7394a | 1621 | |
0c0e6195 KH |
1622 | vm_total_pages = nr_free_pagecache_pages(); |
1623 | writeback_set_ratelimit(); | |
7b78d335 YG |
1624 | |
1625 | memory_notify(MEM_OFFLINE, &arg); | |
0c0e6195 KH |
1626 | return 0; |
1627 | ||
1628 | failed_removal: | |
e33e33b4 CY |
1629 | pr_debug("memory offlining [mem %#010llx-%#010llx] failed\n", |
1630 | (unsigned long long) start_pfn << PAGE_SHIFT, | |
1631 | ((unsigned long long) end_pfn << PAGE_SHIFT) - 1); | |
7b78d335 | 1632 | memory_notify(MEM_CANCEL_OFFLINE, &arg); |
0c0e6195 | 1633 | /* pushback to free area */ |
0815f3d8 | 1634 | undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE); |
0c0e6195 KH |
1635 | return ret; |
1636 | } | |
71088785 | 1637 | |
b93e0f32 | 1638 | /* Must be protected by mem_hotplug_begin() or a device_lock */ |
a16cee10 WC |
1639 | int offline_pages(unsigned long start_pfn, unsigned long nr_pages) |
1640 | { | |
ecde0f3e | 1641 | return __offline_pages(start_pfn, start_pfn + nr_pages); |
a16cee10 | 1642 | } |
e2ff3940 | 1643 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
a16cee10 | 1644 | |
bbc76be6 WC |
1645 | /** |
1646 | * walk_memory_range - walks through all mem sections in [start_pfn, end_pfn) | |
1647 | * @start_pfn: start pfn of the memory range | |
e05c4bbf | 1648 | * @end_pfn: end pfn of the memory range |
bbc76be6 WC |
1649 | * @arg: argument passed to func |
1650 | * @func: callback for each memory section walked | |
1651 | * | |
1652 | * This function walks through all present mem sections in range | |
1653 | * [start_pfn, end_pfn) and call func on each mem section. | |
1654 | * | |
1655 | * Returns the return value of func. | |
1656 | */ | |
e2ff3940 | 1657 | int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn, |
bbc76be6 | 1658 | void *arg, int (*func)(struct memory_block *, void *)) |
71088785 | 1659 | { |
e90bdb7f WC |
1660 | struct memory_block *mem = NULL; |
1661 | struct mem_section *section; | |
e90bdb7f WC |
1662 | unsigned long pfn, section_nr; |
1663 | int ret; | |
e90bdb7f WC |
1664 | |
1665 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { | |
1666 | section_nr = pfn_to_section_nr(pfn); | |
1667 | if (!present_section_nr(section_nr)) | |
1668 | continue; | |
1669 | ||
1670 | section = __nr_to_section(section_nr); | |
1671 | /* same memblock? */ | |
1672 | if (mem) | |
1673 | if ((section_nr >= mem->start_section_nr) && | |
1674 | (section_nr <= mem->end_section_nr)) | |
1675 | continue; | |
1676 | ||
1677 | mem = find_memory_block_hinted(section, mem); | |
1678 | if (!mem) | |
1679 | continue; | |
1680 | ||
bbc76be6 | 1681 | ret = func(mem, arg); |
e90bdb7f | 1682 | if (ret) { |
bbc76be6 WC |
1683 | kobject_put(&mem->dev.kobj); |
1684 | return ret; | |
e90bdb7f WC |
1685 | } |
1686 | } | |
1687 | ||
1688 | if (mem) | |
1689 | kobject_put(&mem->dev.kobj); | |
1690 | ||
bbc76be6 WC |
1691 | return 0; |
1692 | } | |
1693 | ||
e2ff3940 | 1694 | #ifdef CONFIG_MEMORY_HOTREMOVE |
d6de9d53 | 1695 | static int check_memblock_offlined_cb(struct memory_block *mem, void *arg) |
bbc76be6 WC |
1696 | { |
1697 | int ret = !is_memblock_offlined(mem); | |
1698 | ||
349daa0f RD |
1699 | if (unlikely(ret)) { |
1700 | phys_addr_t beginpa, endpa; | |
1701 | ||
1702 | beginpa = PFN_PHYS(section_nr_to_pfn(mem->start_section_nr)); | |
1703 | endpa = PFN_PHYS(section_nr_to_pfn(mem->end_section_nr + 1))-1; | |
756a025f | 1704 | pr_warn("removing memory fails, because memory [%pa-%pa] is onlined\n", |
349daa0f RD |
1705 | &beginpa, &endpa); |
1706 | } | |
bbc76be6 WC |
1707 | |
1708 | return ret; | |
1709 | } | |
1710 | ||
0f1cfe9d | 1711 | static int check_cpu_on_node(pg_data_t *pgdat) |
60a5a19e | 1712 | { |
60a5a19e TC |
1713 | int cpu; |
1714 | ||
1715 | for_each_present_cpu(cpu) { | |
1716 | if (cpu_to_node(cpu) == pgdat->node_id) | |
1717 | /* | |
1718 | * the cpu on this node isn't removed, and we can't | |
1719 | * offline this node. | |
1720 | */ | |
1721 | return -EBUSY; | |
1722 | } | |
1723 | ||
1724 | return 0; | |
1725 | } | |
1726 | ||
0f1cfe9d | 1727 | static void unmap_cpu_on_node(pg_data_t *pgdat) |
e13fe869 WC |
1728 | { |
1729 | #ifdef CONFIG_ACPI_NUMA | |
e13fe869 WC |
1730 | int cpu; |
1731 | ||
1732 | for_each_possible_cpu(cpu) | |
1733 | if (cpu_to_node(cpu) == pgdat->node_id) | |
1734 | numa_clear_node(cpu); | |
1735 | #endif | |
1736 | } | |
1737 | ||
0f1cfe9d | 1738 | static int check_and_unmap_cpu_on_node(pg_data_t *pgdat) |
e13fe869 | 1739 | { |
0f1cfe9d | 1740 | int ret; |
e13fe869 | 1741 | |
0f1cfe9d | 1742 | ret = check_cpu_on_node(pgdat); |
e13fe869 WC |
1743 | if (ret) |
1744 | return ret; | |
1745 | ||
1746 | /* | |
1747 | * the node will be offlined when we come here, so we can clear | |
1748 | * the cpu_to_node() now. | |
1749 | */ | |
1750 | ||
0f1cfe9d | 1751 | unmap_cpu_on_node(pgdat); |
e13fe869 WC |
1752 | return 0; |
1753 | } | |
1754 | ||
0f1cfe9d TK |
1755 | /** |
1756 | * try_offline_node | |
e8b098fc | 1757 | * @nid: the node ID |
0f1cfe9d TK |
1758 | * |
1759 | * Offline a node if all memory sections and cpus of the node are removed. | |
1760 | * | |
1761 | * NOTE: The caller must call lock_device_hotplug() to serialize hotplug | |
1762 | * and online/offline operations before this call. | |
1763 | */ | |
90b30cdc | 1764 | void try_offline_node(int nid) |
60a5a19e | 1765 | { |
d822b86a WC |
1766 | pg_data_t *pgdat = NODE_DATA(nid); |
1767 | unsigned long start_pfn = pgdat->node_start_pfn; | |
1768 | unsigned long end_pfn = start_pfn + pgdat->node_spanned_pages; | |
60a5a19e TC |
1769 | unsigned long pfn; |
1770 | ||
1771 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { | |
1772 | unsigned long section_nr = pfn_to_section_nr(pfn); | |
1773 | ||
1774 | if (!present_section_nr(section_nr)) | |
1775 | continue; | |
1776 | ||
1777 | if (pfn_to_nid(pfn) != nid) | |
1778 | continue; | |
1779 | ||
1780 | /* | |
1781 | * some memory sections of this node are not removed, and we | |
1782 | * can't offline node now. | |
1783 | */ | |
1784 | return; | |
1785 | } | |
1786 | ||
0f1cfe9d | 1787 | if (check_and_unmap_cpu_on_node(pgdat)) |
60a5a19e TC |
1788 | return; |
1789 | ||
1790 | /* | |
1791 | * all memory/cpu of this node are removed, we can offline this | |
1792 | * node now. | |
1793 | */ | |
1794 | node_set_offline(nid); | |
1795 | unregister_one_node(nid); | |
1796 | } | |
90b30cdc | 1797 | EXPORT_SYMBOL(try_offline_node); |
60a5a19e | 1798 | |
0f1cfe9d TK |
1799 | /** |
1800 | * remove_memory | |
e8b098fc MR |
1801 | * @nid: the node ID |
1802 | * @start: physical address of the region to remove | |
1803 | * @size: size of the region to remove | |
0f1cfe9d TK |
1804 | * |
1805 | * NOTE: The caller must call lock_device_hotplug() to serialize hotplug | |
1806 | * and online/offline operations before this call, as required by | |
1807 | * try_offline_node(). | |
1808 | */ | |
242831eb | 1809 | void __ref remove_memory(int nid, u64 start, u64 size) |
bbc76be6 | 1810 | { |
242831eb | 1811 | int ret; |
993c1aad | 1812 | |
27356f54 TK |
1813 | BUG_ON(check_hotplug_memory_range(start, size)); |
1814 | ||
bfc8c901 | 1815 | mem_hotplug_begin(); |
6677e3ea YI |
1816 | |
1817 | /* | |
242831eb RW |
1818 | * All memory blocks must be offlined before removing memory. Check |
1819 | * whether all memory blocks in question are offline and trigger a BUG() | |
1820 | * if this is not the case. | |
6677e3ea | 1821 | */ |
242831eb | 1822 | ret = walk_memory_range(PFN_DOWN(start), PFN_UP(start + size - 1), NULL, |
d6de9d53 | 1823 | check_memblock_offlined_cb); |
bfc8c901 | 1824 | if (ret) |
242831eb | 1825 | BUG(); |
6677e3ea | 1826 | |
46c66c4b YI |
1827 | /* remove memmap entry */ |
1828 | firmware_map_remove(start, start + size, "System RAM"); | |
f9126ab9 XQ |
1829 | memblock_free(start, size); |
1830 | memblock_remove(start, size); | |
46c66c4b | 1831 | |
da024512 | 1832 | arch_remove_memory(start, size, NULL); |
24d335ca | 1833 | |
60a5a19e TC |
1834 | try_offline_node(nid); |
1835 | ||
bfc8c901 | 1836 | mem_hotplug_done(); |
71088785 | 1837 | } |
71088785 | 1838 | EXPORT_SYMBOL_GPL(remove_memory); |
aba6efc4 | 1839 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |