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> |
2c25071b | 38 | #include <linux/rmap.h> |
3947be19 DH |
39 | |
40 | #include <asm/tlbflush.h> | |
41 | ||
1e5ad9a3 AB |
42 | #include "internal.h" |
43 | ||
9d0ad8ca DK |
44 | /* |
45 | * online_page_callback contains pointer to current page onlining function. | |
46 | * Initially it is generic_online_page(). If it is required it could be | |
47 | * changed by calling set_online_page_callback() for callback registration | |
48 | * and restore_online_page_callback() for generic callback restore. | |
49 | */ | |
50 | ||
51 | static void generic_online_page(struct page *page); | |
52 | ||
53 | static online_page_callback_t online_page_callback = generic_online_page; | |
bfc8c901 | 54 | static DEFINE_MUTEX(online_page_callback_lock); |
9d0ad8ca | 55 | |
3f906ba2 | 56 | DEFINE_STATIC_PERCPU_RWSEM(mem_hotplug_lock); |
bfc8c901 | 57 | |
3f906ba2 TG |
58 | void get_online_mems(void) |
59 | { | |
60 | percpu_down_read(&mem_hotplug_lock); | |
61 | } | |
bfc8c901 | 62 | |
3f906ba2 TG |
63 | void put_online_mems(void) |
64 | { | |
65 | percpu_up_read(&mem_hotplug_lock); | |
66 | } | |
bfc8c901 | 67 | |
4932381e MH |
68 | bool movable_node_enabled = false; |
69 | ||
8604d9e5 | 70 | #ifndef CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE |
31bc3858 | 71 | bool memhp_auto_online; |
8604d9e5 VK |
72 | #else |
73 | bool memhp_auto_online = true; | |
74 | #endif | |
31bc3858 VK |
75 | EXPORT_SYMBOL_GPL(memhp_auto_online); |
76 | ||
86dd995d VK |
77 | static int __init setup_memhp_default_state(char *str) |
78 | { | |
79 | if (!strcmp(str, "online")) | |
80 | memhp_auto_online = true; | |
81 | else if (!strcmp(str, "offline")) | |
82 | memhp_auto_online = false; | |
83 | ||
84 | return 1; | |
85 | } | |
86 | __setup("memhp_default_state=", setup_memhp_default_state); | |
87 | ||
30467e0b | 88 | void mem_hotplug_begin(void) |
20d6c96b | 89 | { |
3f906ba2 TG |
90 | cpus_read_lock(); |
91 | percpu_down_write(&mem_hotplug_lock); | |
20d6c96b KM |
92 | } |
93 | ||
30467e0b | 94 | void mem_hotplug_done(void) |
bfc8c901 | 95 | { |
3f906ba2 TG |
96 | percpu_up_write(&mem_hotplug_lock); |
97 | cpus_read_unlock(); | |
bfc8c901 | 98 | } |
20d6c96b | 99 | |
45e0b78b KM |
100 | /* add this memory to iomem resource */ |
101 | static struct resource *register_memory_resource(u64 start, u64 size) | |
102 | { | |
5042db43 | 103 | struct resource *res, *conflict; |
45e0b78b | 104 | res = kzalloc(sizeof(struct resource), GFP_KERNEL); |
6f754ba4 VK |
105 | if (!res) |
106 | return ERR_PTR(-ENOMEM); | |
45e0b78b KM |
107 | |
108 | res->name = "System RAM"; | |
109 | res->start = start; | |
110 | res->end = start + size - 1; | |
782b8664 | 111 | res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; |
5042db43 JG |
112 | conflict = request_resource_conflict(&iomem_resource, res); |
113 | if (conflict) { | |
114 | if (conflict->desc == IORES_DESC_DEVICE_PRIVATE_MEMORY) { | |
115 | pr_debug("Device unaddressable memory block " | |
116 | "memory hotplug at %#010llx !\n", | |
117 | (unsigned long long)start); | |
118 | } | |
4996eed8 | 119 | pr_debug("System RAM resource %pR cannot be added\n", res); |
45e0b78b | 120 | kfree(res); |
6f754ba4 | 121 | return ERR_PTR(-EEXIST); |
45e0b78b KM |
122 | } |
123 | return res; | |
124 | } | |
125 | ||
126 | static void release_memory_resource(struct resource *res) | |
127 | { | |
128 | if (!res) | |
129 | return; | |
130 | release_resource(res); | |
131 | kfree(res); | |
132 | return; | |
133 | } | |
134 | ||
53947027 | 135 | #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE |
46723bfa YI |
136 | void get_page_bootmem(unsigned long info, struct page *page, |
137 | unsigned long type) | |
04753278 | 138 | { |
ddffe98d | 139 | page->freelist = (void *)type; |
04753278 YG |
140 | SetPagePrivate(page); |
141 | set_page_private(page, info); | |
fe896d18 | 142 | page_ref_inc(page); |
04753278 YG |
143 | } |
144 | ||
170a5a7e | 145 | void put_page_bootmem(struct page *page) |
04753278 | 146 | { |
5f24ce5f | 147 | unsigned long type; |
04753278 | 148 | |
ddffe98d | 149 | type = (unsigned long) page->freelist; |
5f24ce5f AA |
150 | BUG_ON(type < MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE || |
151 | type > MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE); | |
04753278 | 152 | |
fe896d18 | 153 | if (page_ref_dec_return(page) == 1) { |
ddffe98d | 154 | page->freelist = NULL; |
04753278 YG |
155 | ClearPagePrivate(page); |
156 | set_page_private(page, 0); | |
5f24ce5f | 157 | INIT_LIST_HEAD(&page->lru); |
170a5a7e | 158 | free_reserved_page(page); |
04753278 | 159 | } |
04753278 YG |
160 | } |
161 | ||
46723bfa YI |
162 | #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE |
163 | #ifndef CONFIG_SPARSEMEM_VMEMMAP | |
d92bc318 | 164 | static void register_page_bootmem_info_section(unsigned long start_pfn) |
04753278 YG |
165 | { |
166 | unsigned long *usemap, mapsize, section_nr, i; | |
167 | struct mem_section *ms; | |
168 | struct page *page, *memmap; | |
169 | ||
04753278 YG |
170 | section_nr = pfn_to_section_nr(start_pfn); |
171 | ms = __nr_to_section(section_nr); | |
172 | ||
173 | /* Get section's memmap address */ | |
174 | memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); | |
175 | ||
176 | /* | |
177 | * Get page for the memmap's phys address | |
178 | * XXX: need more consideration for sparse_vmemmap... | |
179 | */ | |
180 | page = virt_to_page(memmap); | |
181 | mapsize = sizeof(struct page) * PAGES_PER_SECTION; | |
182 | mapsize = PAGE_ALIGN(mapsize) >> PAGE_SHIFT; | |
183 | ||
184 | /* remember memmap's page */ | |
185 | for (i = 0; i < mapsize; i++, page++) | |
186 | get_page_bootmem(section_nr, page, SECTION_INFO); | |
187 | ||
188 | usemap = __nr_to_section(section_nr)->pageblock_flags; | |
189 | page = virt_to_page(usemap); | |
190 | ||
191 | mapsize = PAGE_ALIGN(usemap_size()) >> PAGE_SHIFT; | |
192 | ||
193 | for (i = 0; i < mapsize; i++, page++) | |
af370fb8 | 194 | get_page_bootmem(section_nr, page, MIX_SECTION_INFO); |
04753278 YG |
195 | |
196 | } | |
46723bfa YI |
197 | #else /* CONFIG_SPARSEMEM_VMEMMAP */ |
198 | static void register_page_bootmem_info_section(unsigned long start_pfn) | |
199 | { | |
200 | unsigned long *usemap, mapsize, section_nr, i; | |
201 | struct mem_section *ms; | |
202 | struct page *page, *memmap; | |
203 | ||
204 | if (!pfn_valid(start_pfn)) | |
205 | return; | |
206 | ||
207 | section_nr = pfn_to_section_nr(start_pfn); | |
208 | ms = __nr_to_section(section_nr); | |
209 | ||
210 | memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); | |
211 | ||
212 | register_page_bootmem_memmap(section_nr, memmap, PAGES_PER_SECTION); | |
213 | ||
214 | usemap = __nr_to_section(section_nr)->pageblock_flags; | |
215 | page = virt_to_page(usemap); | |
216 | ||
217 | mapsize = PAGE_ALIGN(usemap_size()) >> PAGE_SHIFT; | |
218 | ||
219 | for (i = 0; i < mapsize; i++, page++) | |
220 | get_page_bootmem(section_nr, page, MIX_SECTION_INFO); | |
221 | } | |
222 | #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ | |
04753278 | 223 | |
7ded384a | 224 | void __init register_page_bootmem_info_node(struct pglist_data *pgdat) |
04753278 YG |
225 | { |
226 | unsigned long i, pfn, end_pfn, nr_pages; | |
227 | int node = pgdat->node_id; | |
228 | struct page *page; | |
04753278 YG |
229 | |
230 | nr_pages = PAGE_ALIGN(sizeof(struct pglist_data)) >> PAGE_SHIFT; | |
231 | page = virt_to_page(pgdat); | |
232 | ||
233 | for (i = 0; i < nr_pages; i++, page++) | |
234 | get_page_bootmem(node, page, NODE_INFO); | |
235 | ||
04753278 | 236 | pfn = pgdat->node_start_pfn; |
c1f19495 | 237 | end_pfn = pgdat_end_pfn(pgdat); |
04753278 | 238 | |
7e9f5eb0 | 239 | /* register section info */ |
f14851af | 240 | for (; pfn < end_pfn; pfn += PAGES_PER_SECTION) { |
241 | /* | |
242 | * Some platforms can assign the same pfn to multiple nodes - on | |
243 | * node0 as well as nodeN. To avoid registering a pfn against | |
244 | * multiple nodes we check that this pfn does not already | |
7e9f5eb0 | 245 | * reside in some other nodes. |
f14851af | 246 | */ |
f65e91df | 247 | if (pfn_valid(pfn) && (early_pfn_to_nid(pfn) == node)) |
f14851af | 248 | register_page_bootmem_info_section(pfn); |
249 | } | |
04753278 | 250 | } |
46723bfa | 251 | #endif /* CONFIG_HAVE_BOOTMEM_INFO_NODE */ |
04753278 | 252 | |
f1dd2cd1 MH |
253 | static int __meminit __add_section(int nid, unsigned long phys_start_pfn, |
254 | bool want_memblock) | |
3947be19 | 255 | { |
3947be19 | 256 | int ret; |
f1dd2cd1 | 257 | int i; |
3947be19 | 258 | |
ebd15302 KH |
259 | if (pfn_valid(phys_start_pfn)) |
260 | return -EEXIST; | |
261 | ||
f1dd2cd1 | 262 | ret = sparse_add_one_section(NODE_DATA(nid), phys_start_pfn); |
3947be19 DH |
263 | if (ret < 0) |
264 | return ret; | |
265 | ||
f1dd2cd1 MH |
266 | /* |
267 | * Make all the pages reserved so that nobody will stumble over half | |
268 | * initialized state. | |
269 | * FIXME: We also have to associate it with a node because pfn_to_node | |
270 | * relies on having page with the proper node. | |
271 | */ | |
272 | for (i = 0; i < PAGES_PER_SECTION; i++) { | |
273 | unsigned long pfn = phys_start_pfn + i; | |
274 | struct page *page; | |
275 | if (!pfn_valid(pfn)) | |
276 | continue; | |
718127cc | 277 | |
f1dd2cd1 MH |
278 | page = pfn_to_page(pfn); |
279 | set_page_node(page, nid); | |
280 | SetPageReserved(page); | |
281 | } | |
718127cc | 282 | |
1b862aec MH |
283 | if (!want_memblock) |
284 | return 0; | |
285 | ||
c04fc586 | 286 | return register_new_memory(nid, __pfn_to_section(phys_start_pfn)); |
3947be19 DH |
287 | } |
288 | ||
4edd7cef DR |
289 | /* |
290 | * Reasonably generic function for adding memory. It is | |
291 | * expected that archs that support memory hotplug will | |
292 | * call this function after deciding the zone to which to | |
293 | * add the new pages. | |
294 | */ | |
f1dd2cd1 | 295 | int __ref __add_pages(int nid, unsigned long phys_start_pfn, |
1b862aec | 296 | unsigned long nr_pages, bool want_memblock) |
4edd7cef DR |
297 | { |
298 | unsigned long i; | |
299 | int err = 0; | |
300 | int start_sec, end_sec; | |
4b94ffdc DW |
301 | struct vmem_altmap *altmap; |
302 | ||
4edd7cef DR |
303 | /* during initialize mem_map, align hot-added range to section */ |
304 | start_sec = pfn_to_section_nr(phys_start_pfn); | |
305 | end_sec = pfn_to_section_nr(phys_start_pfn + nr_pages - 1); | |
306 | ||
4b94ffdc DW |
307 | altmap = to_vmem_altmap((unsigned long) pfn_to_page(phys_start_pfn)); |
308 | if (altmap) { | |
309 | /* | |
310 | * Validate altmap is within bounds of the total request | |
311 | */ | |
312 | if (altmap->base_pfn != phys_start_pfn | |
313 | || vmem_altmap_offset(altmap) > nr_pages) { | |
314 | pr_warn_once("memory add fail, invalid altmap\n"); | |
7cf91a98 JK |
315 | err = -EINVAL; |
316 | goto out; | |
4b94ffdc DW |
317 | } |
318 | altmap->alloc = 0; | |
319 | } | |
320 | ||
4edd7cef | 321 | for (i = start_sec; i <= end_sec; i++) { |
f1dd2cd1 | 322 | err = __add_section(nid, section_nr_to_pfn(i), want_memblock); |
4edd7cef DR |
323 | |
324 | /* | |
325 | * EEXIST is finally dealt with by ioresource collision | |
326 | * check. see add_memory() => register_memory_resource() | |
327 | * Warning will be printed if there is collision. | |
328 | */ | |
329 | if (err && (err != -EEXIST)) | |
330 | break; | |
331 | err = 0; | |
f64ac5e6 | 332 | cond_resched(); |
4edd7cef | 333 | } |
c435a390 | 334 | vmemmap_populate_print_last(); |
7cf91a98 | 335 | out: |
4edd7cef DR |
336 | return err; |
337 | } | |
338 | EXPORT_SYMBOL_GPL(__add_pages); | |
339 | ||
340 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
815121d2 | 341 | /* find the smallest valid pfn in the range [start_pfn, end_pfn) */ |
d09b0137 | 342 | static unsigned long find_smallest_section_pfn(int nid, struct zone *zone, |
815121d2 YI |
343 | unsigned long start_pfn, |
344 | unsigned long end_pfn) | |
345 | { | |
346 | struct mem_section *ms; | |
347 | ||
348 | for (; start_pfn < end_pfn; start_pfn += PAGES_PER_SECTION) { | |
349 | ms = __pfn_to_section(start_pfn); | |
350 | ||
351 | if (unlikely(!valid_section(ms))) | |
352 | continue; | |
353 | ||
354 | if (unlikely(pfn_to_nid(start_pfn) != nid)) | |
355 | continue; | |
356 | ||
357 | if (zone && zone != page_zone(pfn_to_page(start_pfn))) | |
358 | continue; | |
359 | ||
360 | return start_pfn; | |
361 | } | |
362 | ||
363 | return 0; | |
364 | } | |
365 | ||
366 | /* find the biggest valid pfn in the range [start_pfn, end_pfn). */ | |
d09b0137 | 367 | static unsigned long find_biggest_section_pfn(int nid, struct zone *zone, |
815121d2 YI |
368 | unsigned long start_pfn, |
369 | unsigned long end_pfn) | |
370 | { | |
371 | struct mem_section *ms; | |
372 | unsigned long pfn; | |
373 | ||
374 | /* pfn is the end pfn of a memory section. */ | |
375 | pfn = end_pfn - 1; | |
376 | for (; pfn >= start_pfn; pfn -= PAGES_PER_SECTION) { | |
377 | ms = __pfn_to_section(pfn); | |
378 | ||
379 | if (unlikely(!valid_section(ms))) | |
380 | continue; | |
381 | ||
382 | if (unlikely(pfn_to_nid(pfn) != nid)) | |
383 | continue; | |
384 | ||
385 | if (zone && zone != page_zone(pfn_to_page(pfn))) | |
386 | continue; | |
387 | ||
388 | return pfn; | |
389 | } | |
390 | ||
391 | return 0; | |
392 | } | |
393 | ||
394 | static void shrink_zone_span(struct zone *zone, unsigned long start_pfn, | |
395 | unsigned long end_pfn) | |
396 | { | |
c33bc315 XQ |
397 | unsigned long zone_start_pfn = zone->zone_start_pfn; |
398 | unsigned long z = zone_end_pfn(zone); /* zone_end_pfn namespace clash */ | |
399 | unsigned long zone_end_pfn = z; | |
815121d2 YI |
400 | unsigned long pfn; |
401 | struct mem_section *ms; | |
402 | int nid = zone_to_nid(zone); | |
403 | ||
404 | zone_span_writelock(zone); | |
405 | if (zone_start_pfn == start_pfn) { | |
406 | /* | |
407 | * If the section is smallest section in the zone, it need | |
408 | * shrink zone->zone_start_pfn and zone->zone_spanned_pages. | |
409 | * In this case, we find second smallest valid mem_section | |
410 | * for shrinking zone. | |
411 | */ | |
412 | pfn = find_smallest_section_pfn(nid, zone, end_pfn, | |
413 | zone_end_pfn); | |
414 | if (pfn) { | |
415 | zone->zone_start_pfn = pfn; | |
416 | zone->spanned_pages = zone_end_pfn - pfn; | |
417 | } | |
418 | } else if (zone_end_pfn == end_pfn) { | |
419 | /* | |
420 | * If the section is biggest section in the zone, it need | |
421 | * shrink zone->spanned_pages. | |
422 | * In this case, we find second biggest valid mem_section for | |
423 | * shrinking zone. | |
424 | */ | |
425 | pfn = find_biggest_section_pfn(nid, zone, zone_start_pfn, | |
426 | start_pfn); | |
427 | if (pfn) | |
428 | zone->spanned_pages = pfn - zone_start_pfn + 1; | |
429 | } | |
430 | ||
431 | /* | |
432 | * The section is not biggest or smallest mem_section in the zone, it | |
433 | * only creates a hole in the zone. So in this case, we need not | |
434 | * change the zone. But perhaps, the zone has only hole data. Thus | |
435 | * it check the zone has only hole or not. | |
436 | */ | |
437 | pfn = zone_start_pfn; | |
438 | for (; pfn < zone_end_pfn; pfn += PAGES_PER_SECTION) { | |
439 | ms = __pfn_to_section(pfn); | |
440 | ||
441 | if (unlikely(!valid_section(ms))) | |
442 | continue; | |
443 | ||
444 | if (page_zone(pfn_to_page(pfn)) != zone) | |
445 | continue; | |
446 | ||
447 | /* If the section is current section, it continues the loop */ | |
448 | if (start_pfn == pfn) | |
449 | continue; | |
450 | ||
451 | /* If we find valid section, we have nothing to do */ | |
452 | zone_span_writeunlock(zone); | |
453 | return; | |
454 | } | |
455 | ||
456 | /* The zone has no valid section */ | |
457 | zone->zone_start_pfn = 0; | |
458 | zone->spanned_pages = 0; | |
459 | zone_span_writeunlock(zone); | |
460 | } | |
461 | ||
462 | static void shrink_pgdat_span(struct pglist_data *pgdat, | |
463 | unsigned long start_pfn, unsigned long end_pfn) | |
464 | { | |
83285c72 XQ |
465 | unsigned long pgdat_start_pfn = pgdat->node_start_pfn; |
466 | unsigned long p = pgdat_end_pfn(pgdat); /* pgdat_end_pfn namespace clash */ | |
467 | unsigned long pgdat_end_pfn = p; | |
815121d2 YI |
468 | unsigned long pfn; |
469 | struct mem_section *ms; | |
470 | int nid = pgdat->node_id; | |
471 | ||
472 | if (pgdat_start_pfn == start_pfn) { | |
473 | /* | |
474 | * If the section is smallest section in the pgdat, it need | |
475 | * shrink pgdat->node_start_pfn and pgdat->node_spanned_pages. | |
476 | * In this case, we find second smallest valid mem_section | |
477 | * for shrinking zone. | |
478 | */ | |
479 | pfn = find_smallest_section_pfn(nid, NULL, end_pfn, | |
480 | pgdat_end_pfn); | |
481 | if (pfn) { | |
482 | pgdat->node_start_pfn = pfn; | |
483 | pgdat->node_spanned_pages = pgdat_end_pfn - pfn; | |
484 | } | |
485 | } else if (pgdat_end_pfn == end_pfn) { | |
486 | /* | |
487 | * If the section is biggest section in the pgdat, it need | |
488 | * shrink pgdat->node_spanned_pages. | |
489 | * In this case, we find second biggest valid mem_section for | |
490 | * shrinking zone. | |
491 | */ | |
492 | pfn = find_biggest_section_pfn(nid, NULL, pgdat_start_pfn, | |
493 | start_pfn); | |
494 | if (pfn) | |
495 | pgdat->node_spanned_pages = pfn - pgdat_start_pfn + 1; | |
496 | } | |
497 | ||
498 | /* | |
499 | * If the section is not biggest or smallest mem_section in the pgdat, | |
500 | * it only creates a hole in the pgdat. So in this case, we need not | |
501 | * change the pgdat. | |
502 | * But perhaps, the pgdat has only hole data. Thus it check the pgdat | |
503 | * has only hole or not. | |
504 | */ | |
505 | pfn = pgdat_start_pfn; | |
506 | for (; pfn < pgdat_end_pfn; pfn += PAGES_PER_SECTION) { | |
507 | ms = __pfn_to_section(pfn); | |
508 | ||
509 | if (unlikely(!valid_section(ms))) | |
510 | continue; | |
511 | ||
512 | if (pfn_to_nid(pfn) != nid) | |
513 | continue; | |
514 | ||
515 | /* If the section is current section, it continues the loop */ | |
516 | if (start_pfn == pfn) | |
517 | continue; | |
518 | ||
519 | /* If we find valid section, we have nothing to do */ | |
520 | return; | |
521 | } | |
522 | ||
523 | /* The pgdat has no valid section */ | |
524 | pgdat->node_start_pfn = 0; | |
525 | pgdat->node_spanned_pages = 0; | |
526 | } | |
527 | ||
528 | static void __remove_zone(struct zone *zone, unsigned long start_pfn) | |
529 | { | |
530 | struct pglist_data *pgdat = zone->zone_pgdat; | |
531 | int nr_pages = PAGES_PER_SECTION; | |
815121d2 YI |
532 | unsigned long flags; |
533 | ||
815121d2 YI |
534 | pgdat_resize_lock(zone->zone_pgdat, &flags); |
535 | shrink_zone_span(zone, start_pfn, start_pfn + nr_pages); | |
536 | shrink_pgdat_span(pgdat, start_pfn, start_pfn + nr_pages); | |
537 | pgdat_resize_unlock(zone->zone_pgdat, &flags); | |
538 | } | |
539 | ||
4b94ffdc DW |
540 | static int __remove_section(struct zone *zone, struct mem_section *ms, |
541 | unsigned long map_offset) | |
ea01ea93 | 542 | { |
815121d2 YI |
543 | unsigned long start_pfn; |
544 | int scn_nr; | |
ea01ea93 BP |
545 | int ret = -EINVAL; |
546 | ||
547 | if (!valid_section(ms)) | |
548 | return ret; | |
549 | ||
550 | ret = unregister_memory_section(ms); | |
551 | if (ret) | |
552 | return ret; | |
553 | ||
815121d2 | 554 | scn_nr = __section_nr(ms); |
1dd2bfc8 | 555 | start_pfn = section_nr_to_pfn((unsigned long)scn_nr); |
815121d2 YI |
556 | __remove_zone(zone, start_pfn); |
557 | ||
4b94ffdc | 558 | sparse_remove_one_section(zone, ms, map_offset); |
ea01ea93 BP |
559 | return 0; |
560 | } | |
561 | ||
ea01ea93 BP |
562 | /** |
563 | * __remove_pages() - remove sections of pages from a zone | |
564 | * @zone: zone from which pages need to be removed | |
565 | * @phys_start_pfn: starting pageframe (must be aligned to start of a section) | |
566 | * @nr_pages: number of pages to remove (must be multiple of section size) | |
567 | * | |
568 | * Generic helper function to remove section mappings and sysfs entries | |
569 | * for the section of the memory we are removing. Caller needs to make | |
570 | * sure that pages are marked reserved and zones are adjust properly by | |
571 | * calling offline_pages(). | |
572 | */ | |
573 | int __remove_pages(struct zone *zone, unsigned long phys_start_pfn, | |
574 | unsigned long nr_pages) | |
575 | { | |
fe74ebb1 | 576 | unsigned long i; |
4b94ffdc DW |
577 | unsigned long map_offset = 0; |
578 | int sections_to_remove, ret = 0; | |
579 | ||
580 | /* In the ZONE_DEVICE case device driver owns the memory region */ | |
581 | if (is_dev_zone(zone)) { | |
582 | struct page *page = pfn_to_page(phys_start_pfn); | |
583 | struct vmem_altmap *altmap; | |
584 | ||
585 | altmap = to_vmem_altmap((unsigned long) page); | |
586 | if (altmap) | |
587 | map_offset = vmem_altmap_offset(altmap); | |
588 | } else { | |
589 | resource_size_t start, size; | |
590 | ||
591 | start = phys_start_pfn << PAGE_SHIFT; | |
592 | size = nr_pages * PAGE_SIZE; | |
593 | ||
594 | ret = release_mem_region_adjustable(&iomem_resource, start, | |
595 | size); | |
596 | if (ret) { | |
597 | resource_size_t endres = start + size - 1; | |
598 | ||
599 | pr_warn("Unable to release resource <%pa-%pa> (%d)\n", | |
600 | &start, &endres, ret); | |
601 | } | |
602 | } | |
ea01ea93 | 603 | |
7cf91a98 JK |
604 | clear_zone_contiguous(zone); |
605 | ||
ea01ea93 BP |
606 | /* |
607 | * We can only remove entire sections | |
608 | */ | |
609 | BUG_ON(phys_start_pfn & ~PAGE_SECTION_MASK); | |
610 | BUG_ON(nr_pages % PAGES_PER_SECTION); | |
611 | ||
ea01ea93 BP |
612 | sections_to_remove = nr_pages / PAGES_PER_SECTION; |
613 | for (i = 0; i < sections_to_remove; i++) { | |
614 | unsigned long pfn = phys_start_pfn + i*PAGES_PER_SECTION; | |
4b94ffdc DW |
615 | |
616 | ret = __remove_section(zone, __pfn_to_section(pfn), map_offset); | |
617 | map_offset = 0; | |
ea01ea93 BP |
618 | if (ret) |
619 | break; | |
620 | } | |
7cf91a98 JK |
621 | |
622 | set_zone_contiguous(zone); | |
623 | ||
ea01ea93 BP |
624 | return ret; |
625 | } | |
4edd7cef | 626 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
ea01ea93 | 627 | |
9d0ad8ca DK |
628 | int set_online_page_callback(online_page_callback_t callback) |
629 | { | |
630 | int rc = -EINVAL; | |
631 | ||
bfc8c901 VD |
632 | get_online_mems(); |
633 | mutex_lock(&online_page_callback_lock); | |
9d0ad8ca DK |
634 | |
635 | if (online_page_callback == generic_online_page) { | |
636 | online_page_callback = callback; | |
637 | rc = 0; | |
638 | } | |
639 | ||
bfc8c901 VD |
640 | mutex_unlock(&online_page_callback_lock); |
641 | put_online_mems(); | |
9d0ad8ca DK |
642 | |
643 | return rc; | |
644 | } | |
645 | EXPORT_SYMBOL_GPL(set_online_page_callback); | |
646 | ||
647 | int restore_online_page_callback(online_page_callback_t callback) | |
648 | { | |
649 | int rc = -EINVAL; | |
650 | ||
bfc8c901 VD |
651 | get_online_mems(); |
652 | mutex_lock(&online_page_callback_lock); | |
9d0ad8ca DK |
653 | |
654 | if (online_page_callback == callback) { | |
655 | online_page_callback = generic_online_page; | |
656 | rc = 0; | |
657 | } | |
658 | ||
bfc8c901 VD |
659 | mutex_unlock(&online_page_callback_lock); |
660 | put_online_mems(); | |
9d0ad8ca DK |
661 | |
662 | return rc; | |
663 | } | |
664 | EXPORT_SYMBOL_GPL(restore_online_page_callback); | |
665 | ||
666 | void __online_page_set_limits(struct page *page) | |
180c06ef | 667 | { |
9d0ad8ca DK |
668 | } |
669 | EXPORT_SYMBOL_GPL(__online_page_set_limits); | |
670 | ||
671 | void __online_page_increment_counters(struct page *page) | |
672 | { | |
3dcc0571 | 673 | adjust_managed_page_count(page, 1); |
9d0ad8ca DK |
674 | } |
675 | EXPORT_SYMBOL_GPL(__online_page_increment_counters); | |
180c06ef | 676 | |
9d0ad8ca DK |
677 | void __online_page_free(struct page *page) |
678 | { | |
3dcc0571 | 679 | __free_reserved_page(page); |
180c06ef | 680 | } |
9d0ad8ca DK |
681 | EXPORT_SYMBOL_GPL(__online_page_free); |
682 | ||
683 | static void generic_online_page(struct page *page) | |
684 | { | |
685 | __online_page_set_limits(page); | |
686 | __online_page_increment_counters(page); | |
687 | __online_page_free(page); | |
688 | } | |
180c06ef | 689 | |
75884fb1 KH |
690 | static int online_pages_range(unsigned long start_pfn, unsigned long nr_pages, |
691 | void *arg) | |
3947be19 DH |
692 | { |
693 | unsigned long i; | |
75884fb1 KH |
694 | unsigned long onlined_pages = *(unsigned long *)arg; |
695 | struct page *page; | |
2d070eab | 696 | |
75884fb1 KH |
697 | if (PageReserved(pfn_to_page(start_pfn))) |
698 | for (i = 0; i < nr_pages; i++) { | |
699 | page = pfn_to_page(start_pfn + i); | |
9d0ad8ca | 700 | (*online_page_callback)(page); |
75884fb1 KH |
701 | onlined_pages++; |
702 | } | |
2d070eab MH |
703 | |
704 | online_mem_sections(start_pfn, start_pfn + nr_pages); | |
705 | ||
75884fb1 KH |
706 | *(unsigned long *)arg = onlined_pages; |
707 | return 0; | |
708 | } | |
709 | ||
d9713679 LJ |
710 | /* check which state of node_states will be changed when online memory */ |
711 | static void node_states_check_changes_online(unsigned long nr_pages, | |
712 | struct zone *zone, struct memory_notify *arg) | |
713 | { | |
714 | int nid = zone_to_nid(zone); | |
715 | enum zone_type zone_last = ZONE_NORMAL; | |
716 | ||
717 | /* | |
6715ddf9 LJ |
718 | * If we have HIGHMEM or movable node, node_states[N_NORMAL_MEMORY] |
719 | * contains nodes which have zones of 0...ZONE_NORMAL, | |
720 | * set zone_last to ZONE_NORMAL. | |
d9713679 | 721 | * |
6715ddf9 LJ |
722 | * If we don't have HIGHMEM nor movable node, |
723 | * node_states[N_NORMAL_MEMORY] contains nodes which have zones of | |
724 | * 0...ZONE_MOVABLE, set zone_last to ZONE_MOVABLE. | |
d9713679 | 725 | */ |
6715ddf9 | 726 | if (N_MEMORY == N_NORMAL_MEMORY) |
d9713679 LJ |
727 | zone_last = ZONE_MOVABLE; |
728 | ||
729 | /* | |
730 | * if the memory to be online is in a zone of 0...zone_last, and | |
731 | * the zones of 0...zone_last don't have memory before online, we will | |
732 | * need to set the node to node_states[N_NORMAL_MEMORY] after | |
733 | * the memory is online. | |
734 | */ | |
735 | if (zone_idx(zone) <= zone_last && !node_state(nid, N_NORMAL_MEMORY)) | |
736 | arg->status_change_nid_normal = nid; | |
737 | else | |
738 | arg->status_change_nid_normal = -1; | |
739 | ||
6715ddf9 LJ |
740 | #ifdef CONFIG_HIGHMEM |
741 | /* | |
742 | * If we have movable node, node_states[N_HIGH_MEMORY] | |
743 | * contains nodes which have zones of 0...ZONE_HIGHMEM, | |
744 | * set zone_last to ZONE_HIGHMEM. | |
745 | * | |
746 | * If we don't have movable node, node_states[N_NORMAL_MEMORY] | |
747 | * contains nodes which have zones of 0...ZONE_MOVABLE, | |
748 | * set zone_last to ZONE_MOVABLE. | |
749 | */ | |
750 | zone_last = ZONE_HIGHMEM; | |
751 | if (N_MEMORY == N_HIGH_MEMORY) | |
752 | zone_last = ZONE_MOVABLE; | |
753 | ||
754 | if (zone_idx(zone) <= zone_last && !node_state(nid, N_HIGH_MEMORY)) | |
755 | arg->status_change_nid_high = nid; | |
756 | else | |
757 | arg->status_change_nid_high = -1; | |
758 | #else | |
759 | arg->status_change_nid_high = arg->status_change_nid_normal; | |
760 | #endif | |
761 | ||
d9713679 LJ |
762 | /* |
763 | * if the node don't have memory befor online, we will need to | |
6715ddf9 | 764 | * set the node to node_states[N_MEMORY] after the memory |
d9713679 LJ |
765 | * is online. |
766 | */ | |
6715ddf9 | 767 | if (!node_state(nid, N_MEMORY)) |
d9713679 LJ |
768 | arg->status_change_nid = nid; |
769 | else | |
770 | arg->status_change_nid = -1; | |
771 | } | |
772 | ||
773 | static void node_states_set_node(int node, struct memory_notify *arg) | |
774 | { | |
775 | if (arg->status_change_nid_normal >= 0) | |
776 | node_set_state(node, N_NORMAL_MEMORY); | |
777 | ||
6715ddf9 LJ |
778 | if (arg->status_change_nid_high >= 0) |
779 | node_set_state(node, N_HIGH_MEMORY); | |
780 | ||
781 | node_set_state(node, N_MEMORY); | |
d9713679 LJ |
782 | } |
783 | ||
f1dd2cd1 MH |
784 | static void __meminit resize_zone_range(struct zone *zone, unsigned long start_pfn, |
785 | unsigned long nr_pages) | |
786 | { | |
787 | unsigned long old_end_pfn = zone_end_pfn(zone); | |
788 | ||
789 | if (zone_is_empty(zone) || start_pfn < zone->zone_start_pfn) | |
790 | zone->zone_start_pfn = start_pfn; | |
791 | ||
792 | zone->spanned_pages = max(start_pfn + nr_pages, old_end_pfn) - zone->zone_start_pfn; | |
793 | } | |
794 | ||
795 | static void __meminit resize_pgdat_range(struct pglist_data *pgdat, unsigned long start_pfn, | |
796 | unsigned long nr_pages) | |
797 | { | |
798 | unsigned long old_end_pfn = pgdat_end_pfn(pgdat); | |
799 | ||
800 | if (!pgdat->node_spanned_pages || start_pfn < pgdat->node_start_pfn) | |
801 | pgdat->node_start_pfn = start_pfn; | |
802 | ||
803 | pgdat->node_spanned_pages = max(start_pfn + nr_pages, old_end_pfn) - pgdat->node_start_pfn; | |
804 | } | |
805 | ||
cdf72f25 | 806 | void __ref move_pfn_range_to_zone(struct zone *zone, |
f1dd2cd1 MH |
807 | unsigned long start_pfn, unsigned long nr_pages) |
808 | { | |
809 | struct pglist_data *pgdat = zone->zone_pgdat; | |
810 | int nid = pgdat->node_id; | |
811 | unsigned long flags; | |
df429ac0 | 812 | |
f1dd2cd1 MH |
813 | if (zone_is_empty(zone)) |
814 | init_currently_empty_zone(zone, start_pfn, nr_pages); | |
df429ac0 | 815 | |
f1dd2cd1 MH |
816 | clear_zone_contiguous(zone); |
817 | ||
818 | /* TODO Huh pgdat is irqsave while zone is not. It used to be like that before */ | |
819 | pgdat_resize_lock(pgdat, &flags); | |
820 | zone_span_writelock(zone); | |
821 | resize_zone_range(zone, start_pfn, nr_pages); | |
822 | zone_span_writeunlock(zone); | |
823 | resize_pgdat_range(pgdat, start_pfn, nr_pages); | |
824 | pgdat_resize_unlock(pgdat, &flags); | |
825 | ||
826 | /* | |
827 | * TODO now we have a visible range of pages which are not associated | |
828 | * with their zone properly. Not nice but set_pfnblock_flags_mask | |
829 | * expects the zone spans the pfn range. All the pages in the range | |
830 | * are reserved so nobody should be touching them so we should be safe | |
831 | */ | |
832 | memmap_init_zone(nr_pages, nid, zone_idx(zone), start_pfn, MEMMAP_HOTPLUG); | |
833 | ||
834 | set_zone_contiguous(zone); | |
835 | } | |
836 | ||
c246a213 MH |
837 | /* |
838 | * Returns a default kernel memory zone for the given pfn range. | |
839 | * If no kernel zone covers this pfn range it will automatically go | |
840 | * to the ZONE_NORMAL. | |
841 | */ | |
c6f03e29 | 842 | static struct zone *default_kernel_zone_for_pfn(int nid, unsigned long start_pfn, |
c246a213 MH |
843 | unsigned long nr_pages) |
844 | { | |
845 | struct pglist_data *pgdat = NODE_DATA(nid); | |
846 | int zid; | |
847 | ||
848 | for (zid = 0; zid <= ZONE_NORMAL; zid++) { | |
849 | struct zone *zone = &pgdat->node_zones[zid]; | |
850 | ||
851 | if (zone_intersects(zone, start_pfn, nr_pages)) | |
852 | return zone; | |
853 | } | |
854 | ||
855 | return &pgdat->node_zones[ZONE_NORMAL]; | |
856 | } | |
857 | ||
c6f03e29 MH |
858 | static inline struct zone *default_zone_for_pfn(int nid, unsigned long start_pfn, |
859 | unsigned long nr_pages) | |
e5e68930 | 860 | { |
c6f03e29 MH |
861 | struct zone *kernel_zone = default_kernel_zone_for_pfn(nid, start_pfn, |
862 | nr_pages); | |
863 | struct zone *movable_zone = &NODE_DATA(nid)->node_zones[ZONE_MOVABLE]; | |
864 | bool in_kernel = zone_intersects(kernel_zone, start_pfn, nr_pages); | |
865 | bool in_movable = zone_intersects(movable_zone, start_pfn, nr_pages); | |
e5e68930 MH |
866 | |
867 | /* | |
c6f03e29 MH |
868 | * We inherit the existing zone in a simple case where zones do not |
869 | * overlap in the given range | |
e5e68930 | 870 | */ |
c6f03e29 MH |
871 | if (in_kernel ^ in_movable) |
872 | return (in_kernel) ? kernel_zone : movable_zone; | |
9f123ab5 | 873 | |
c6f03e29 MH |
874 | /* |
875 | * If the range doesn't belong to any zone or two zones overlap in the | |
876 | * given range then we use movable zone only if movable_node is | |
877 | * enabled because we always online to a kernel zone by default. | |
878 | */ | |
879 | return movable_node_enabled ? movable_zone : kernel_zone; | |
9f123ab5 MH |
880 | } |
881 | ||
e5e68930 MH |
882 | struct zone * zone_for_pfn_range(int online_type, int nid, unsigned start_pfn, |
883 | unsigned long nr_pages) | |
f1dd2cd1 | 884 | { |
c6f03e29 MH |
885 | if (online_type == MMOP_ONLINE_KERNEL) |
886 | return default_kernel_zone_for_pfn(nid, start_pfn, nr_pages); | |
f1dd2cd1 | 887 | |
c6f03e29 MH |
888 | if (online_type == MMOP_ONLINE_MOVABLE) |
889 | return &NODE_DATA(nid)->node_zones[ZONE_MOVABLE]; | |
df429ac0 | 890 | |
c6f03e29 | 891 | return default_zone_for_pfn(nid, start_pfn, nr_pages); |
e5e68930 MH |
892 | } |
893 | ||
894 | /* | |
895 | * Associates the given pfn range with the given node and the zone appropriate | |
896 | * for the given online type. | |
897 | */ | |
898 | static struct zone * __meminit move_pfn_range(int online_type, int nid, | |
899 | unsigned long start_pfn, unsigned long nr_pages) | |
900 | { | |
901 | struct zone *zone; | |
902 | ||
903 | zone = zone_for_pfn_range(online_type, nid, start_pfn, nr_pages); | |
f1dd2cd1 MH |
904 | move_pfn_range_to_zone(zone, start_pfn, nr_pages); |
905 | return zone; | |
df429ac0 | 906 | } |
75884fb1 | 907 | |
b93e0f32 | 908 | /* Must be protected by mem_hotplug_begin() or a device_lock */ |
511c2aba | 909 | int __ref online_pages(unsigned long pfn, unsigned long nr_pages, int online_type) |
75884fb1 | 910 | { |
aa47228a | 911 | unsigned long flags; |
3947be19 DH |
912 | unsigned long onlined_pages = 0; |
913 | struct zone *zone; | |
6811378e | 914 | int need_zonelists_rebuild = 0; |
7b78d335 YG |
915 | int nid; |
916 | int ret; | |
917 | struct memory_notify arg; | |
918 | ||
f1dd2cd1 | 919 | nid = pfn_to_nid(pfn); |
f1dd2cd1 MH |
920 | /* associate pfn range with the zone */ |
921 | zone = move_pfn_range(online_type, nid, pfn, nr_pages); | |
922 | ||
7b78d335 YG |
923 | arg.start_pfn = pfn; |
924 | arg.nr_pages = nr_pages; | |
d9713679 | 925 | node_states_check_changes_online(nr_pages, zone, &arg); |
7b78d335 | 926 | |
7b78d335 YG |
927 | ret = memory_notify(MEM_GOING_ONLINE, &arg); |
928 | ret = notifier_to_errno(ret); | |
e33e33b4 CY |
929 | if (ret) |
930 | goto failed_addition; | |
931 | ||
6811378e YG |
932 | /* |
933 | * If this zone is not populated, then it is not in zonelist. | |
934 | * This means the page allocator ignores this zone. | |
935 | * So, zonelist must be updated after online. | |
936 | */ | |
6dcd73d7 | 937 | if (!populated_zone(zone)) { |
6811378e | 938 | need_zonelists_rebuild = 1; |
72675e13 | 939 | setup_zone_pageset(zone); |
6dcd73d7 | 940 | } |
6811378e | 941 | |
908eedc6 | 942 | ret = walk_system_ram_range(pfn, nr_pages, &onlined_pages, |
75884fb1 | 943 | online_pages_range); |
fd8a4221 | 944 | if (ret) { |
6dcd73d7 WC |
945 | if (need_zonelists_rebuild) |
946 | zone_pcp_reset(zone); | |
e33e33b4 | 947 | goto failed_addition; |
fd8a4221 GL |
948 | } |
949 | ||
3947be19 | 950 | zone->present_pages += onlined_pages; |
aa47228a CS |
951 | |
952 | pgdat_resize_lock(zone->zone_pgdat, &flags); | |
f2937be5 | 953 | zone->zone_pgdat->node_present_pages += onlined_pages; |
aa47228a CS |
954 | pgdat_resize_unlock(zone->zone_pgdat, &flags); |
955 | ||
08dff7b7 | 956 | if (onlined_pages) { |
e888ca35 | 957 | node_states_set_node(nid, &arg); |
08dff7b7 | 958 | if (need_zonelists_rebuild) |
72675e13 | 959 | build_all_zonelists(NULL); |
08dff7b7 JL |
960 | else |
961 | zone_pcp_update(zone); | |
962 | } | |
3947be19 | 963 | |
1b79acc9 KM |
964 | init_per_zone_wmark_min(); |
965 | ||
698b1b30 | 966 | if (onlined_pages) { |
e888ca35 | 967 | kswapd_run(nid); |
698b1b30 VB |
968 | kcompactd_run(nid); |
969 | } | |
61b13993 | 970 | |
1f522509 | 971 | vm_total_pages = nr_free_pagecache_pages(); |
2f7f24ec | 972 | |
2d1d43f6 | 973 | writeback_set_ratelimit(); |
7b78d335 YG |
974 | |
975 | if (onlined_pages) | |
976 | memory_notify(MEM_ONLINE, &arg); | |
30467e0b | 977 | return 0; |
e33e33b4 CY |
978 | |
979 | failed_addition: | |
980 | pr_debug("online_pages [mem %#010llx-%#010llx] failed\n", | |
981 | (unsigned long long) pfn << PAGE_SHIFT, | |
982 | (((unsigned long long) pfn + nr_pages) << PAGE_SHIFT) - 1); | |
983 | memory_notify(MEM_CANCEL_ONLINE, &arg); | |
984 | return ret; | |
3947be19 | 985 | } |
53947027 | 986 | #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ |
bc02af93 | 987 | |
0bd85420 TC |
988 | static void reset_node_present_pages(pg_data_t *pgdat) |
989 | { | |
990 | struct zone *z; | |
991 | ||
992 | for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++) | |
993 | z->present_pages = 0; | |
994 | ||
995 | pgdat->node_present_pages = 0; | |
996 | } | |
997 | ||
e1319331 HS |
998 | /* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */ |
999 | static pg_data_t __ref *hotadd_new_pgdat(int nid, u64 start) | |
9af3c2de YG |
1000 | { |
1001 | struct pglist_data *pgdat; | |
1002 | unsigned long zones_size[MAX_NR_ZONES] = {0}; | |
1003 | unsigned long zholes_size[MAX_NR_ZONES] = {0}; | |
c8e861a5 | 1004 | unsigned long start_pfn = PFN_DOWN(start); |
9af3c2de | 1005 | |
a1e565aa TC |
1006 | pgdat = NODE_DATA(nid); |
1007 | if (!pgdat) { | |
1008 | pgdat = arch_alloc_nodedata(nid); | |
1009 | if (!pgdat) | |
1010 | return NULL; | |
9af3c2de | 1011 | |
a1e565aa | 1012 | arch_refresh_nodedata(nid, pgdat); |
b0dc3a34 | 1013 | } else { |
e716f2eb MG |
1014 | /* |
1015 | * Reset the nr_zones, order and classzone_idx before reuse. | |
1016 | * Note that kswapd will init kswapd_classzone_idx properly | |
1017 | * when it starts in the near future. | |
1018 | */ | |
b0dc3a34 | 1019 | pgdat->nr_zones = 0; |
38087d9b MG |
1020 | pgdat->kswapd_order = 0; |
1021 | pgdat->kswapd_classzone_idx = 0; | |
a1e565aa | 1022 | } |
9af3c2de YG |
1023 | |
1024 | /* we can use NODE_DATA(nid) from here */ | |
1025 | ||
1026 | /* init node's zones as empty zones, we don't have any present pages.*/ | |
9109fb7b | 1027 | free_area_init_node(nid, zones_size, start_pfn, zholes_size); |
5830169f | 1028 | pgdat->per_cpu_nodestats = alloc_percpu(struct per_cpu_nodestat); |
9af3c2de | 1029 | |
959ecc48 KH |
1030 | /* |
1031 | * The node we allocated has no zone fallback lists. For avoiding | |
1032 | * to access not-initialized zonelist, build here. | |
1033 | */ | |
72675e13 | 1034 | build_all_zonelists(pgdat); |
959ecc48 | 1035 | |
f784a3f1 TC |
1036 | /* |
1037 | * zone->managed_pages is set to an approximate value in | |
1038 | * free_area_init_core(), which will cause | |
1039 | * /sys/device/system/node/nodeX/meminfo has wrong data. | |
1040 | * So reset it to 0 before any memory is onlined. | |
1041 | */ | |
1042 | reset_node_managed_pages(pgdat); | |
1043 | ||
0bd85420 TC |
1044 | /* |
1045 | * When memory is hot-added, all the memory is in offline state. So | |
1046 | * clear all zones' present_pages because they will be updated in | |
1047 | * online_pages() and offline_pages(). | |
1048 | */ | |
1049 | reset_node_present_pages(pgdat); | |
1050 | ||
9af3c2de YG |
1051 | return pgdat; |
1052 | } | |
1053 | ||
1054 | static void rollback_node_hotadd(int nid, pg_data_t *pgdat) | |
1055 | { | |
1056 | arch_refresh_nodedata(nid, NULL); | |
5830169f | 1057 | free_percpu(pgdat->per_cpu_nodestats); |
9af3c2de YG |
1058 | arch_free_nodedata(pgdat); |
1059 | return; | |
1060 | } | |
1061 | ||
0a547039 | 1062 | |
01b0f197 TK |
1063 | /** |
1064 | * try_online_node - online a node if offlined | |
1065 | * | |
cf23422b | 1066 | * called by cpu_up() to online a node without onlined memory. |
1067 | */ | |
01b0f197 | 1068 | int try_online_node(int nid) |
cf23422b | 1069 | { |
1070 | pg_data_t *pgdat; | |
1071 | int ret; | |
1072 | ||
01b0f197 TK |
1073 | if (node_online(nid)) |
1074 | return 0; | |
1075 | ||
bfc8c901 | 1076 | mem_hotplug_begin(); |
cf23422b | 1077 | pgdat = hotadd_new_pgdat(nid, 0); |
7553e8f2 | 1078 | if (!pgdat) { |
01b0f197 | 1079 | pr_err("Cannot online node %d due to NULL pgdat\n", nid); |
cf23422b | 1080 | ret = -ENOMEM; |
1081 | goto out; | |
1082 | } | |
1083 | node_set_online(nid); | |
1084 | ret = register_one_node(nid); | |
1085 | BUG_ON(ret); | |
cf23422b | 1086 | out: |
bfc8c901 | 1087 | mem_hotplug_done(); |
cf23422b | 1088 | return ret; |
1089 | } | |
1090 | ||
27356f54 TK |
1091 | static int check_hotplug_memory_range(u64 start, u64 size) |
1092 | { | |
c8e861a5 | 1093 | u64 start_pfn = PFN_DOWN(start); |
27356f54 TK |
1094 | u64 nr_pages = size >> PAGE_SHIFT; |
1095 | ||
1096 | /* Memory range must be aligned with section */ | |
1097 | if ((start_pfn & ~PAGE_SECTION_MASK) || | |
1098 | (nr_pages % PAGES_PER_SECTION) || (!nr_pages)) { | |
1099 | pr_err("Section-unaligned hotplug range: start 0x%llx, size 0x%llx\n", | |
1100 | (unsigned long long)start, | |
1101 | (unsigned long long)size); | |
1102 | return -EINVAL; | |
1103 | } | |
1104 | ||
1105 | return 0; | |
1106 | } | |
1107 | ||
31bc3858 VK |
1108 | static int online_memory_block(struct memory_block *mem, void *arg) |
1109 | { | |
dc18d706 | 1110 | return device_online(&mem->dev); |
31bc3858 VK |
1111 | } |
1112 | ||
31168481 | 1113 | /* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */ |
31bc3858 | 1114 | int __ref add_memory_resource(int nid, struct resource *res, bool online) |
bc02af93 | 1115 | { |
62cedb9f | 1116 | u64 start, size; |
9af3c2de | 1117 | pg_data_t *pgdat = NULL; |
a1e565aa TC |
1118 | bool new_pgdat; |
1119 | bool new_node; | |
bc02af93 YG |
1120 | int ret; |
1121 | ||
62cedb9f DV |
1122 | start = res->start; |
1123 | size = resource_size(res); | |
1124 | ||
27356f54 TK |
1125 | ret = check_hotplug_memory_range(start, size); |
1126 | if (ret) | |
1127 | return ret; | |
1128 | ||
a1e565aa TC |
1129 | { /* Stupid hack to suppress address-never-null warning */ |
1130 | void *p = NODE_DATA(nid); | |
1131 | new_pgdat = !p; | |
1132 | } | |
ac13c462 | 1133 | |
bfc8c901 | 1134 | mem_hotplug_begin(); |
ac13c462 | 1135 | |
7f36e3e5 TC |
1136 | /* |
1137 | * Add new range to memblock so that when hotadd_new_pgdat() is called | |
1138 | * to allocate new pgdat, get_pfn_range_for_nid() will be able to find | |
1139 | * this new range and calculate total pages correctly. The range will | |
1140 | * be removed at hot-remove time. | |
1141 | */ | |
1142 | memblock_add_node(start, size, nid); | |
1143 | ||
a1e565aa TC |
1144 | new_node = !node_online(nid); |
1145 | if (new_node) { | |
9af3c2de | 1146 | pgdat = hotadd_new_pgdat(nid, start); |
6ad696d2 | 1147 | ret = -ENOMEM; |
9af3c2de | 1148 | if (!pgdat) |
41b9e2d7 | 1149 | goto error; |
9af3c2de YG |
1150 | } |
1151 | ||
bc02af93 | 1152 | /* call arch's memory hotadd */ |
3d79a728 | 1153 | ret = arch_add_memory(nid, start, size, true); |
bc02af93 | 1154 | |
9af3c2de YG |
1155 | if (ret < 0) |
1156 | goto error; | |
1157 | ||
0fc44159 | 1158 | /* we online node here. we can't roll back from here. */ |
9af3c2de YG |
1159 | node_set_online(nid); |
1160 | ||
a1e565aa | 1161 | if (new_node) { |
9037a993 MH |
1162 | unsigned long start_pfn = start >> PAGE_SHIFT; |
1163 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
1164 | ||
1165 | ret = __register_one_node(nid); | |
1166 | if (ret) | |
1167 | goto register_fail; | |
1168 | ||
1169 | /* | |
1170 | * link memory sections under this node. This is already | |
1171 | * done when creatig memory section in register_new_memory | |
1172 | * but that depends to have the node registered so offline | |
1173 | * nodes have to go through register_node. | |
1174 | * TODO clean up this mess. | |
1175 | */ | |
1176 | ret = link_mem_sections(nid, start_pfn, nr_pages); | |
1177 | register_fail: | |
0fc44159 YG |
1178 | /* |
1179 | * If sysfs file of new node can't create, cpu on the node | |
1180 | * can't be hot-added. There is no rollback way now. | |
1181 | * So, check by BUG_ON() to catch it reluctantly.. | |
1182 | */ | |
1183 | BUG_ON(ret); | |
1184 | } | |
1185 | ||
d96ae530 | 1186 | /* create new memmap entry */ |
1187 | firmware_map_add_hotplug(start, start + size, "System RAM"); | |
1188 | ||
31bc3858 VK |
1189 | /* online pages if requested */ |
1190 | if (online) | |
1191 | walk_memory_range(PFN_DOWN(start), PFN_UP(start + size - 1), | |
1192 | NULL, online_memory_block); | |
1193 | ||
6ad696d2 AK |
1194 | goto out; |
1195 | ||
9af3c2de YG |
1196 | error: |
1197 | /* rollback pgdat allocation and others */ | |
dbac61a3 | 1198 | if (new_pgdat && pgdat) |
9af3c2de | 1199 | rollback_node_hotadd(nid, pgdat); |
7f36e3e5 | 1200 | memblock_remove(start, size); |
9af3c2de | 1201 | |
6ad696d2 | 1202 | out: |
bfc8c901 | 1203 | mem_hotplug_done(); |
bc02af93 YG |
1204 | return ret; |
1205 | } | |
62cedb9f DV |
1206 | EXPORT_SYMBOL_GPL(add_memory_resource); |
1207 | ||
1208 | int __ref add_memory(int nid, u64 start, u64 size) | |
1209 | { | |
1210 | struct resource *res; | |
1211 | int ret; | |
1212 | ||
1213 | res = register_memory_resource(start, size); | |
6f754ba4 VK |
1214 | if (IS_ERR(res)) |
1215 | return PTR_ERR(res); | |
62cedb9f | 1216 | |
31bc3858 | 1217 | ret = add_memory_resource(nid, res, memhp_auto_online); |
62cedb9f DV |
1218 | if (ret < 0) |
1219 | release_memory_resource(res); | |
1220 | return ret; | |
1221 | } | |
bc02af93 | 1222 | EXPORT_SYMBOL_GPL(add_memory); |
0c0e6195 KH |
1223 | |
1224 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
5c755e9f BP |
1225 | /* |
1226 | * A free page on the buddy free lists (not the per-cpu lists) has PageBuddy | |
1227 | * set and the size of the free page is given by page_order(). Using this, | |
1228 | * the function determines if the pageblock contains only free pages. | |
1229 | * Due to buddy contraints, a free page at least the size of a pageblock will | |
1230 | * be located at the start of the pageblock | |
1231 | */ | |
1232 | static inline int pageblock_free(struct page *page) | |
1233 | { | |
1234 | return PageBuddy(page) && page_order(page) >= pageblock_order; | |
1235 | } | |
1236 | ||
1237 | /* Return the start of the next active pageblock after a given page */ | |
1238 | static struct page *next_active_pageblock(struct page *page) | |
1239 | { | |
5c755e9f BP |
1240 | /* Ensure the starting page is pageblock-aligned */ |
1241 | BUG_ON(page_to_pfn(page) & (pageblock_nr_pages - 1)); | |
1242 | ||
5c755e9f | 1243 | /* If the entire pageblock is free, move to the end of free page */ |
0dcc48c1 KH |
1244 | if (pageblock_free(page)) { |
1245 | int order; | |
1246 | /* be careful. we don't have locks, page_order can be changed.*/ | |
1247 | order = page_order(page); | |
1248 | if ((order < MAX_ORDER) && (order >= pageblock_order)) | |
1249 | return page + (1 << order); | |
1250 | } | |
5c755e9f | 1251 | |
0dcc48c1 | 1252 | return page + pageblock_nr_pages; |
5c755e9f BP |
1253 | } |
1254 | ||
1255 | /* Checks if this range of memory is likely to be hot-removable. */ | |
c98940f6 | 1256 | bool is_mem_section_removable(unsigned long start_pfn, unsigned long nr_pages) |
5c755e9f | 1257 | { |
5c755e9f | 1258 | struct page *page = pfn_to_page(start_pfn); |
659052d1 MH |
1259 | unsigned long end_pfn = min(start_pfn + nr_pages, zone_end_pfn(page_zone(page))); |
1260 | struct page *end_page = pfn_to_page(end_pfn); | |
5c755e9f BP |
1261 | |
1262 | /* Check the starting page of each pageblock within the range */ | |
1263 | for (; page < end_page; page = next_active_pageblock(page)) { | |
49ac8255 | 1264 | if (!is_pageblock_removable_nolock(page)) |
c98940f6 | 1265 | return false; |
49ac8255 | 1266 | cond_resched(); |
5c755e9f BP |
1267 | } |
1268 | ||
1269 | /* All pageblocks in the memory block are likely to be hot-removable */ | |
c98940f6 | 1270 | return true; |
5c755e9f BP |
1271 | } |
1272 | ||
0c0e6195 | 1273 | /* |
deb88a2a | 1274 | * Confirm all pages in a range [start, end) belong to the same zone. |
a96dfddb | 1275 | * When true, return its valid [start, end). |
0c0e6195 | 1276 | */ |
a96dfddb TK |
1277 | int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn, |
1278 | unsigned long *valid_start, unsigned long *valid_end) | |
0c0e6195 | 1279 | { |
5f0f2887 | 1280 | unsigned long pfn, sec_end_pfn; |
a96dfddb | 1281 | unsigned long start, end; |
0c0e6195 KH |
1282 | struct zone *zone = NULL; |
1283 | struct page *page; | |
1284 | int i; | |
deb88a2a | 1285 | for (pfn = start_pfn, sec_end_pfn = SECTION_ALIGN_UP(start_pfn + 1); |
0c0e6195 | 1286 | pfn < end_pfn; |
deb88a2a | 1287 | pfn = sec_end_pfn, sec_end_pfn += PAGES_PER_SECTION) { |
5f0f2887 AB |
1288 | /* Make sure the memory section is present first */ |
1289 | if (!present_section_nr(pfn_to_section_nr(pfn))) | |
0c0e6195 | 1290 | continue; |
5f0f2887 AB |
1291 | for (; pfn < sec_end_pfn && pfn < end_pfn; |
1292 | pfn += MAX_ORDER_NR_PAGES) { | |
1293 | i = 0; | |
1294 | /* This is just a CONFIG_HOLES_IN_ZONE check.*/ | |
1295 | while ((i < MAX_ORDER_NR_PAGES) && | |
1296 | !pfn_valid_within(pfn + i)) | |
1297 | i++; | |
d6d8c8a4 | 1298 | if (i == MAX_ORDER_NR_PAGES || pfn + i >= end_pfn) |
5f0f2887 | 1299 | continue; |
d83382c6 MZ |
1300 | /* Check if we got outside of the zone */ |
1301 | if (zone && !zone_spans_pfn(zone, pfn + i)) | |
1302 | return 0; | |
5f0f2887 AB |
1303 | page = pfn_to_page(pfn + i); |
1304 | if (zone && page_zone(page) != zone) | |
1305 | return 0; | |
a96dfddb TK |
1306 | if (!zone) |
1307 | start = pfn + i; | |
5f0f2887 | 1308 | zone = page_zone(page); |
a96dfddb | 1309 | end = pfn + MAX_ORDER_NR_PAGES; |
5f0f2887 | 1310 | } |
0c0e6195 | 1311 | } |
deb88a2a | 1312 | |
a96dfddb TK |
1313 | if (zone) { |
1314 | *valid_start = start; | |
d6d8c8a4 | 1315 | *valid_end = min(end, end_pfn); |
deb88a2a | 1316 | return 1; |
a96dfddb | 1317 | } else { |
deb88a2a | 1318 | return 0; |
a96dfddb | 1319 | } |
0c0e6195 KH |
1320 | } |
1321 | ||
1322 | /* | |
0efadf48 YX |
1323 | * Scan pfn range [start,end) to find movable/migratable pages (LRU pages, |
1324 | * non-lru movable pages and hugepages). We scan pfn because it's much | |
1325 | * easier than scanning over linked list. This function returns the pfn | |
1326 | * of the first found movable page if it's found, otherwise 0. | |
0c0e6195 | 1327 | */ |
c8721bbb | 1328 | static unsigned long scan_movable_pages(unsigned long start, unsigned long end) |
0c0e6195 KH |
1329 | { |
1330 | unsigned long pfn; | |
1331 | struct page *page; | |
1332 | for (pfn = start; pfn < end; pfn++) { | |
1333 | if (pfn_valid(pfn)) { | |
1334 | page = pfn_to_page(pfn); | |
1335 | if (PageLRU(page)) | |
1336 | return pfn; | |
0efadf48 YX |
1337 | if (__PageMovable(page)) |
1338 | return pfn; | |
c8721bbb | 1339 | if (PageHuge(page)) { |
7e1f049e | 1340 | if (page_huge_active(page)) |
c8721bbb NH |
1341 | return pfn; |
1342 | else | |
1343 | pfn = round_up(pfn + 1, | |
1344 | 1 << compound_order(page)) - 1; | |
1345 | } | |
0c0e6195 KH |
1346 | } |
1347 | } | |
1348 | return 0; | |
1349 | } | |
1350 | ||
394e31d2 XQ |
1351 | static struct page *new_node_page(struct page *page, unsigned long private, |
1352 | int **result) | |
1353 | { | |
394e31d2 | 1354 | int nid = page_to_nid(page); |
231e97e2 | 1355 | nodemask_t nmask = node_states[N_MEMORY]; |
7f252f27 MH |
1356 | |
1357 | /* | |
1358 | * try to allocate from a different node but reuse this node if there | |
1359 | * are no other online nodes to be used (e.g. we are offlining a part | |
1360 | * of the only existing node) | |
1361 | */ | |
1362 | node_clear(nid, nmask); | |
1363 | if (nodes_empty(nmask)) | |
1364 | node_set(nid, nmask); | |
394e31d2 | 1365 | |
8b913238 | 1366 | return new_page_nodemask(page, nid, &nmask); |
394e31d2 XQ |
1367 | } |
1368 | ||
0c0e6195 KH |
1369 | #define NR_OFFLINE_AT_ONCE_PAGES (256) |
1370 | static int | |
1371 | do_migrate_range(unsigned long start_pfn, unsigned long end_pfn) | |
1372 | { | |
1373 | unsigned long pfn; | |
1374 | struct page *page; | |
1375 | int move_pages = NR_OFFLINE_AT_ONCE_PAGES; | |
1376 | int not_managed = 0; | |
1377 | int ret = 0; | |
1378 | LIST_HEAD(source); | |
1379 | ||
1380 | for (pfn = start_pfn; pfn < end_pfn && move_pages > 0; pfn++) { | |
1381 | if (!pfn_valid(pfn)) | |
1382 | continue; | |
1383 | page = pfn_to_page(pfn); | |
c8721bbb NH |
1384 | |
1385 | if (PageHuge(page)) { | |
1386 | struct page *head = compound_head(page); | |
1387 | pfn = page_to_pfn(head) + (1<<compound_order(head)) - 1; | |
1388 | if (compound_order(head) > PFN_SECTION_SHIFT) { | |
1389 | ret = -EBUSY; | |
1390 | break; | |
1391 | } | |
1392 | if (isolate_huge_page(page, &source)) | |
1393 | move_pages -= 1 << compound_order(head); | |
1394 | continue; | |
8135d892 NH |
1395 | } else if (thp_migration_supported() && PageTransHuge(page)) |
1396 | pfn = page_to_pfn(compound_head(page)) | |
1397 | + hpage_nr_pages(page) - 1; | |
c8721bbb | 1398 | |
2c25071b MH |
1399 | /* |
1400 | * HWPoison pages have elevated reference counts so the migration would | |
1401 | * fail on them. It also doesn't make any sense to migrate them in the | |
1402 | * first place. Still try to unmap such a page in case it is still mapped | |
1403 | * (e.g. current hwpoison implementation doesn't unmap KSM pages but keep | |
1404 | * the unmap as the catch all safety net). | |
1405 | */ | |
1406 | if (PageHWPoison(page)) { | |
1407 | if (WARN_ON(PageLRU(page))) | |
1408 | isolate_lru_page(page); | |
1409 | if (page_mapped(page)) | |
1410 | try_to_unmap(page, TTU_IGNORE_MLOCK | TTU_IGNORE_ACCESS); | |
1411 | continue; | |
1412 | } | |
1413 | ||
700c2a46 | 1414 | if (!get_page_unless_zero(page)) |
0c0e6195 KH |
1415 | continue; |
1416 | /* | |
0efadf48 YX |
1417 | * We can skip free pages. And we can deal with pages on |
1418 | * LRU and non-lru movable pages. | |
0c0e6195 | 1419 | */ |
0efadf48 YX |
1420 | if (PageLRU(page)) |
1421 | ret = isolate_lru_page(page); | |
1422 | else | |
1423 | ret = isolate_movable_page(page, ISOLATE_UNEVICTABLE); | |
0c0e6195 | 1424 | if (!ret) { /* Success */ |
700c2a46 | 1425 | put_page(page); |
62695a84 | 1426 | list_add_tail(&page->lru, &source); |
0c0e6195 | 1427 | move_pages--; |
0efadf48 YX |
1428 | if (!__PageMovable(page)) |
1429 | inc_node_page_state(page, NR_ISOLATED_ANON + | |
1430 | page_is_file_cache(page)); | |
6d9c285a | 1431 | |
0c0e6195 | 1432 | } else { |
0c0e6195 | 1433 | #ifdef CONFIG_DEBUG_VM |
0efadf48 YX |
1434 | pr_alert("failed to isolate pfn %lx\n", pfn); |
1435 | dump_page(page, "isolation failed"); | |
0c0e6195 | 1436 | #endif |
700c2a46 | 1437 | put_page(page); |
25985edc | 1438 | /* Because we don't have big zone->lock. we should |
809c4449 BL |
1439 | check this again here. */ |
1440 | if (page_count(page)) { | |
1441 | not_managed++; | |
f3ab2636 | 1442 | ret = -EBUSY; |
809c4449 BL |
1443 | break; |
1444 | } | |
0c0e6195 KH |
1445 | } |
1446 | } | |
f3ab2636 BL |
1447 | if (!list_empty(&source)) { |
1448 | if (not_managed) { | |
c8721bbb | 1449 | putback_movable_pages(&source); |
f3ab2636 BL |
1450 | goto out; |
1451 | } | |
74c08f98 | 1452 | |
394e31d2 XQ |
1453 | /* Allocate a new page from the nearest neighbor node */ |
1454 | ret = migrate_pages(&source, new_node_page, NULL, 0, | |
9c620e2b | 1455 | MIGRATE_SYNC, MR_MEMORY_HOTPLUG); |
f3ab2636 | 1456 | if (ret) |
c8721bbb | 1457 | putback_movable_pages(&source); |
0c0e6195 | 1458 | } |
0c0e6195 KH |
1459 | out: |
1460 | return ret; | |
1461 | } | |
1462 | ||
1463 | /* | |
1464 | * remove from free_area[] and mark all as Reserved. | |
1465 | */ | |
1466 | static int | |
1467 | offline_isolated_pages_cb(unsigned long start, unsigned long nr_pages, | |
1468 | void *data) | |
1469 | { | |
1470 | __offline_isolated_pages(start, start + nr_pages); | |
1471 | return 0; | |
1472 | } | |
1473 | ||
1474 | static void | |
1475 | offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn) | |
1476 | { | |
908eedc6 | 1477 | walk_system_ram_range(start_pfn, end_pfn - start_pfn, NULL, |
0c0e6195 KH |
1478 | offline_isolated_pages_cb); |
1479 | } | |
1480 | ||
1481 | /* | |
1482 | * Check all pages in range, recoreded as memory resource, are isolated. | |
1483 | */ | |
1484 | static int | |
1485 | check_pages_isolated_cb(unsigned long start_pfn, unsigned long nr_pages, | |
1486 | void *data) | |
1487 | { | |
1488 | int ret; | |
1489 | long offlined = *(long *)data; | |
b023f468 | 1490 | ret = test_pages_isolated(start_pfn, start_pfn + nr_pages, true); |
0c0e6195 KH |
1491 | offlined = nr_pages; |
1492 | if (!ret) | |
1493 | *(long *)data += offlined; | |
1494 | return ret; | |
1495 | } | |
1496 | ||
1497 | static long | |
1498 | check_pages_isolated(unsigned long start_pfn, unsigned long end_pfn) | |
1499 | { | |
1500 | long offlined = 0; | |
1501 | int ret; | |
1502 | ||
908eedc6 | 1503 | ret = walk_system_ram_range(start_pfn, end_pfn - start_pfn, &offlined, |
0c0e6195 KH |
1504 | check_pages_isolated_cb); |
1505 | if (ret < 0) | |
1506 | offlined = (long)ret; | |
1507 | return offlined; | |
1508 | } | |
1509 | ||
c5320926 TC |
1510 | static int __init cmdline_parse_movable_node(char *p) |
1511 | { | |
4932381e | 1512 | #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP |
55ac590c | 1513 | movable_node_enabled = true; |
4932381e MH |
1514 | #else |
1515 | pr_warn("movable_node parameter depends on CONFIG_HAVE_MEMBLOCK_NODE_MAP to work properly\n"); | |
1516 | #endif | |
c5320926 TC |
1517 | return 0; |
1518 | } | |
1519 | early_param("movable_node", cmdline_parse_movable_node); | |
1520 | ||
d9713679 LJ |
1521 | /* check which state of node_states will be changed when offline memory */ |
1522 | static void node_states_check_changes_offline(unsigned long nr_pages, | |
1523 | struct zone *zone, struct memory_notify *arg) | |
1524 | { | |
1525 | struct pglist_data *pgdat = zone->zone_pgdat; | |
1526 | unsigned long present_pages = 0; | |
1527 | enum zone_type zt, zone_last = ZONE_NORMAL; | |
1528 | ||
1529 | /* | |
6715ddf9 LJ |
1530 | * If we have HIGHMEM or movable node, node_states[N_NORMAL_MEMORY] |
1531 | * contains nodes which have zones of 0...ZONE_NORMAL, | |
1532 | * set zone_last to ZONE_NORMAL. | |
d9713679 | 1533 | * |
6715ddf9 LJ |
1534 | * If we don't have HIGHMEM nor movable node, |
1535 | * node_states[N_NORMAL_MEMORY] contains nodes which have zones of | |
1536 | * 0...ZONE_MOVABLE, set zone_last to ZONE_MOVABLE. | |
d9713679 | 1537 | */ |
6715ddf9 | 1538 | if (N_MEMORY == N_NORMAL_MEMORY) |
d9713679 LJ |
1539 | zone_last = ZONE_MOVABLE; |
1540 | ||
1541 | /* | |
1542 | * check whether node_states[N_NORMAL_MEMORY] will be changed. | |
1543 | * If the memory to be offline is in a zone of 0...zone_last, | |
1544 | * and it is the last present memory, 0...zone_last will | |
1545 | * become empty after offline , thus we can determind we will | |
1546 | * need to clear the node from node_states[N_NORMAL_MEMORY]. | |
1547 | */ | |
1548 | for (zt = 0; zt <= zone_last; zt++) | |
1549 | present_pages += pgdat->node_zones[zt].present_pages; | |
1550 | if (zone_idx(zone) <= zone_last && nr_pages >= present_pages) | |
1551 | arg->status_change_nid_normal = zone_to_nid(zone); | |
1552 | else | |
1553 | arg->status_change_nid_normal = -1; | |
1554 | ||
6715ddf9 LJ |
1555 | #ifdef CONFIG_HIGHMEM |
1556 | /* | |
1557 | * If we have movable node, node_states[N_HIGH_MEMORY] | |
1558 | * contains nodes which have zones of 0...ZONE_HIGHMEM, | |
1559 | * set zone_last to ZONE_HIGHMEM. | |
1560 | * | |
1561 | * If we don't have movable node, node_states[N_NORMAL_MEMORY] | |
1562 | * contains nodes which have zones of 0...ZONE_MOVABLE, | |
1563 | * set zone_last to ZONE_MOVABLE. | |
1564 | */ | |
1565 | zone_last = ZONE_HIGHMEM; | |
1566 | if (N_MEMORY == N_HIGH_MEMORY) | |
1567 | zone_last = ZONE_MOVABLE; | |
1568 | ||
1569 | for (; zt <= zone_last; zt++) | |
1570 | present_pages += pgdat->node_zones[zt].present_pages; | |
1571 | if (zone_idx(zone) <= zone_last && nr_pages >= present_pages) | |
1572 | arg->status_change_nid_high = zone_to_nid(zone); | |
1573 | else | |
1574 | arg->status_change_nid_high = -1; | |
1575 | #else | |
1576 | arg->status_change_nid_high = arg->status_change_nid_normal; | |
1577 | #endif | |
1578 | ||
d9713679 LJ |
1579 | /* |
1580 | * node_states[N_HIGH_MEMORY] contains nodes which have 0...ZONE_MOVABLE | |
1581 | */ | |
1582 | zone_last = ZONE_MOVABLE; | |
1583 | ||
1584 | /* | |
1585 | * check whether node_states[N_HIGH_MEMORY] will be changed | |
1586 | * If we try to offline the last present @nr_pages from the node, | |
1587 | * we can determind we will need to clear the node from | |
1588 | * node_states[N_HIGH_MEMORY]. | |
1589 | */ | |
1590 | for (; zt <= zone_last; zt++) | |
1591 | present_pages += pgdat->node_zones[zt].present_pages; | |
1592 | if (nr_pages >= present_pages) | |
1593 | arg->status_change_nid = zone_to_nid(zone); | |
1594 | else | |
1595 | arg->status_change_nid = -1; | |
1596 | } | |
1597 | ||
1598 | static void node_states_clear_node(int node, struct memory_notify *arg) | |
1599 | { | |
1600 | if (arg->status_change_nid_normal >= 0) | |
1601 | node_clear_state(node, N_NORMAL_MEMORY); | |
1602 | ||
6715ddf9 LJ |
1603 | if ((N_MEMORY != N_NORMAL_MEMORY) && |
1604 | (arg->status_change_nid_high >= 0)) | |
d9713679 | 1605 | node_clear_state(node, N_HIGH_MEMORY); |
6715ddf9 LJ |
1606 | |
1607 | if ((N_MEMORY != N_HIGH_MEMORY) && | |
1608 | (arg->status_change_nid >= 0)) | |
1609 | node_clear_state(node, N_MEMORY); | |
d9713679 LJ |
1610 | } |
1611 | ||
a16cee10 | 1612 | static int __ref __offline_pages(unsigned long start_pfn, |
0c0e6195 KH |
1613 | unsigned long end_pfn, unsigned long timeout) |
1614 | { | |
1615 | unsigned long pfn, nr_pages, expire; | |
1616 | long offlined_pages; | |
7b78d335 | 1617 | int ret, drain, retry_max, node; |
d702909f | 1618 | unsigned long flags; |
a96dfddb | 1619 | unsigned long valid_start, valid_end; |
0c0e6195 | 1620 | struct zone *zone; |
7b78d335 | 1621 | struct memory_notify arg; |
0c0e6195 | 1622 | |
0c0e6195 KH |
1623 | /* at least, alignment against pageblock is necessary */ |
1624 | if (!IS_ALIGNED(start_pfn, pageblock_nr_pages)) | |
1625 | return -EINVAL; | |
1626 | if (!IS_ALIGNED(end_pfn, pageblock_nr_pages)) | |
1627 | return -EINVAL; | |
1628 | /* This makes hotplug much easier...and readable. | |
1629 | we assume this for now. .*/ | |
a96dfddb | 1630 | if (!test_pages_in_a_zone(start_pfn, end_pfn, &valid_start, &valid_end)) |
0c0e6195 | 1631 | return -EINVAL; |
7b78d335 | 1632 | |
a96dfddb | 1633 | zone = page_zone(pfn_to_page(valid_start)); |
7b78d335 YG |
1634 | node = zone_to_nid(zone); |
1635 | nr_pages = end_pfn - start_pfn; | |
1636 | ||
0c0e6195 | 1637 | /* set above range as isolated */ |
b023f468 WC |
1638 | ret = start_isolate_page_range(start_pfn, end_pfn, |
1639 | MIGRATE_MOVABLE, true); | |
0c0e6195 | 1640 | if (ret) |
30467e0b | 1641 | return ret; |
7b78d335 YG |
1642 | |
1643 | arg.start_pfn = start_pfn; | |
1644 | arg.nr_pages = nr_pages; | |
d9713679 | 1645 | node_states_check_changes_offline(nr_pages, zone, &arg); |
7b78d335 YG |
1646 | |
1647 | ret = memory_notify(MEM_GOING_OFFLINE, &arg); | |
1648 | ret = notifier_to_errno(ret); | |
1649 | if (ret) | |
1650 | goto failed_removal; | |
1651 | ||
0c0e6195 KH |
1652 | pfn = start_pfn; |
1653 | expire = jiffies + timeout; | |
1654 | drain = 0; | |
1655 | retry_max = 5; | |
1656 | repeat: | |
1657 | /* start memory hot removal */ | |
1658 | ret = -EAGAIN; | |
1659 | if (time_after(jiffies, expire)) | |
1660 | goto failed_removal; | |
1661 | ret = -EINTR; | |
1662 | if (signal_pending(current)) | |
1663 | goto failed_removal; | |
1664 | ret = 0; | |
1665 | if (drain) { | |
3f906ba2 | 1666 | lru_add_drain_all_cpuslocked(); |
0c0e6195 | 1667 | cond_resched(); |
c0554329 | 1668 | drain_all_pages(zone); |
0c0e6195 KH |
1669 | } |
1670 | ||
c8721bbb NH |
1671 | pfn = scan_movable_pages(start_pfn, end_pfn); |
1672 | if (pfn) { /* We have movable pages */ | |
0c0e6195 KH |
1673 | ret = do_migrate_range(pfn, end_pfn); |
1674 | if (!ret) { | |
1675 | drain = 1; | |
1676 | goto repeat; | |
1677 | } else { | |
1678 | if (ret < 0) | |
1679 | if (--retry_max == 0) | |
1680 | goto failed_removal; | |
1681 | yield(); | |
1682 | drain = 1; | |
1683 | goto repeat; | |
1684 | } | |
1685 | } | |
b3834be5 | 1686 | /* drain all zone's lru pagevec, this is asynchronous... */ |
3f906ba2 | 1687 | lru_add_drain_all_cpuslocked(); |
0c0e6195 | 1688 | yield(); |
b3834be5 | 1689 | /* drain pcp pages, this is synchronous. */ |
c0554329 | 1690 | drain_all_pages(zone); |
c8721bbb NH |
1691 | /* |
1692 | * dissolve free hugepages in the memory block before doing offlining | |
1693 | * actually in order to make hugetlbfs's object counting consistent. | |
1694 | */ | |
082d5b6b GS |
1695 | ret = dissolve_free_huge_pages(start_pfn, end_pfn); |
1696 | if (ret) | |
1697 | goto failed_removal; | |
0c0e6195 KH |
1698 | /* check again */ |
1699 | offlined_pages = check_pages_isolated(start_pfn, end_pfn); | |
1700 | if (offlined_pages < 0) { | |
1701 | ret = -EBUSY; | |
1702 | goto failed_removal; | |
1703 | } | |
e33e33b4 | 1704 | pr_info("Offlined Pages %ld\n", offlined_pages); |
b3834be5 | 1705 | /* Ok, all of our target is isolated. |
0c0e6195 KH |
1706 | We cannot do rollback at this point. */ |
1707 | offline_isolated_pages(start_pfn, end_pfn); | |
dbc0e4ce | 1708 | /* reset pagetype flags and makes migrate type to be MOVABLE */ |
0815f3d8 | 1709 | undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE); |
0c0e6195 | 1710 | /* removal success */ |
3dcc0571 | 1711 | adjust_managed_page_count(pfn_to_page(start_pfn), -offlined_pages); |
0c0e6195 | 1712 | zone->present_pages -= offlined_pages; |
d702909f CS |
1713 | |
1714 | pgdat_resize_lock(zone->zone_pgdat, &flags); | |
0c0e6195 | 1715 | zone->zone_pgdat->node_present_pages -= offlined_pages; |
d702909f | 1716 | pgdat_resize_unlock(zone->zone_pgdat, &flags); |
7b78d335 | 1717 | |
1b79acc9 KM |
1718 | init_per_zone_wmark_min(); |
1719 | ||
1e8537ba | 1720 | if (!populated_zone(zone)) { |
340175b7 | 1721 | zone_pcp_reset(zone); |
72675e13 | 1722 | build_all_zonelists(NULL); |
1e8537ba XQ |
1723 | } else |
1724 | zone_pcp_update(zone); | |
340175b7 | 1725 | |
d9713679 | 1726 | node_states_clear_node(node, &arg); |
698b1b30 | 1727 | if (arg.status_change_nid >= 0) { |
8fe23e05 | 1728 | kswapd_stop(node); |
698b1b30 VB |
1729 | kcompactd_stop(node); |
1730 | } | |
bce7394a | 1731 | |
0c0e6195 KH |
1732 | vm_total_pages = nr_free_pagecache_pages(); |
1733 | writeback_set_ratelimit(); | |
7b78d335 YG |
1734 | |
1735 | memory_notify(MEM_OFFLINE, &arg); | |
0c0e6195 KH |
1736 | return 0; |
1737 | ||
1738 | failed_removal: | |
e33e33b4 CY |
1739 | pr_debug("memory offlining [mem %#010llx-%#010llx] failed\n", |
1740 | (unsigned long long) start_pfn << PAGE_SHIFT, | |
1741 | ((unsigned long long) end_pfn << PAGE_SHIFT) - 1); | |
7b78d335 | 1742 | memory_notify(MEM_CANCEL_OFFLINE, &arg); |
0c0e6195 | 1743 | /* pushback to free area */ |
0815f3d8 | 1744 | undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE); |
0c0e6195 KH |
1745 | return ret; |
1746 | } | |
71088785 | 1747 | |
b93e0f32 | 1748 | /* Must be protected by mem_hotplug_begin() or a device_lock */ |
a16cee10 WC |
1749 | int offline_pages(unsigned long start_pfn, unsigned long nr_pages) |
1750 | { | |
1751 | return __offline_pages(start_pfn, start_pfn + nr_pages, 120 * HZ); | |
1752 | } | |
e2ff3940 | 1753 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
a16cee10 | 1754 | |
bbc76be6 WC |
1755 | /** |
1756 | * walk_memory_range - walks through all mem sections in [start_pfn, end_pfn) | |
1757 | * @start_pfn: start pfn of the memory range | |
e05c4bbf | 1758 | * @end_pfn: end pfn of the memory range |
bbc76be6 WC |
1759 | * @arg: argument passed to func |
1760 | * @func: callback for each memory section walked | |
1761 | * | |
1762 | * This function walks through all present mem sections in range | |
1763 | * [start_pfn, end_pfn) and call func on each mem section. | |
1764 | * | |
1765 | * Returns the return value of func. | |
1766 | */ | |
e2ff3940 | 1767 | int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn, |
bbc76be6 | 1768 | void *arg, int (*func)(struct memory_block *, void *)) |
71088785 | 1769 | { |
e90bdb7f WC |
1770 | struct memory_block *mem = NULL; |
1771 | struct mem_section *section; | |
e90bdb7f WC |
1772 | unsigned long pfn, section_nr; |
1773 | int ret; | |
e90bdb7f WC |
1774 | |
1775 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { | |
1776 | section_nr = pfn_to_section_nr(pfn); | |
1777 | if (!present_section_nr(section_nr)) | |
1778 | continue; | |
1779 | ||
1780 | section = __nr_to_section(section_nr); | |
1781 | /* same memblock? */ | |
1782 | if (mem) | |
1783 | if ((section_nr >= mem->start_section_nr) && | |
1784 | (section_nr <= mem->end_section_nr)) | |
1785 | continue; | |
1786 | ||
1787 | mem = find_memory_block_hinted(section, mem); | |
1788 | if (!mem) | |
1789 | continue; | |
1790 | ||
bbc76be6 | 1791 | ret = func(mem, arg); |
e90bdb7f | 1792 | if (ret) { |
bbc76be6 WC |
1793 | kobject_put(&mem->dev.kobj); |
1794 | return ret; | |
e90bdb7f WC |
1795 | } |
1796 | } | |
1797 | ||
1798 | if (mem) | |
1799 | kobject_put(&mem->dev.kobj); | |
1800 | ||
bbc76be6 WC |
1801 | return 0; |
1802 | } | |
1803 | ||
e2ff3940 | 1804 | #ifdef CONFIG_MEMORY_HOTREMOVE |
d6de9d53 | 1805 | static int check_memblock_offlined_cb(struct memory_block *mem, void *arg) |
bbc76be6 WC |
1806 | { |
1807 | int ret = !is_memblock_offlined(mem); | |
1808 | ||
349daa0f RD |
1809 | if (unlikely(ret)) { |
1810 | phys_addr_t beginpa, endpa; | |
1811 | ||
1812 | beginpa = PFN_PHYS(section_nr_to_pfn(mem->start_section_nr)); | |
1813 | endpa = PFN_PHYS(section_nr_to_pfn(mem->end_section_nr + 1))-1; | |
756a025f | 1814 | pr_warn("removing memory fails, because memory [%pa-%pa] is onlined\n", |
349daa0f RD |
1815 | &beginpa, &endpa); |
1816 | } | |
bbc76be6 WC |
1817 | |
1818 | return ret; | |
1819 | } | |
1820 | ||
0f1cfe9d | 1821 | static int check_cpu_on_node(pg_data_t *pgdat) |
60a5a19e | 1822 | { |
60a5a19e TC |
1823 | int cpu; |
1824 | ||
1825 | for_each_present_cpu(cpu) { | |
1826 | if (cpu_to_node(cpu) == pgdat->node_id) | |
1827 | /* | |
1828 | * the cpu on this node isn't removed, and we can't | |
1829 | * offline this node. | |
1830 | */ | |
1831 | return -EBUSY; | |
1832 | } | |
1833 | ||
1834 | return 0; | |
1835 | } | |
1836 | ||
0f1cfe9d | 1837 | static void unmap_cpu_on_node(pg_data_t *pgdat) |
e13fe869 WC |
1838 | { |
1839 | #ifdef CONFIG_ACPI_NUMA | |
e13fe869 WC |
1840 | int cpu; |
1841 | ||
1842 | for_each_possible_cpu(cpu) | |
1843 | if (cpu_to_node(cpu) == pgdat->node_id) | |
1844 | numa_clear_node(cpu); | |
1845 | #endif | |
1846 | } | |
1847 | ||
0f1cfe9d | 1848 | static int check_and_unmap_cpu_on_node(pg_data_t *pgdat) |
e13fe869 | 1849 | { |
0f1cfe9d | 1850 | int ret; |
e13fe869 | 1851 | |
0f1cfe9d | 1852 | ret = check_cpu_on_node(pgdat); |
e13fe869 WC |
1853 | if (ret) |
1854 | return ret; | |
1855 | ||
1856 | /* | |
1857 | * the node will be offlined when we come here, so we can clear | |
1858 | * the cpu_to_node() now. | |
1859 | */ | |
1860 | ||
0f1cfe9d | 1861 | unmap_cpu_on_node(pgdat); |
e13fe869 WC |
1862 | return 0; |
1863 | } | |
1864 | ||
0f1cfe9d TK |
1865 | /** |
1866 | * try_offline_node | |
1867 | * | |
1868 | * Offline a node if all memory sections and cpus of the node are removed. | |
1869 | * | |
1870 | * NOTE: The caller must call lock_device_hotplug() to serialize hotplug | |
1871 | * and online/offline operations before this call. | |
1872 | */ | |
90b30cdc | 1873 | void try_offline_node(int nid) |
60a5a19e | 1874 | { |
d822b86a WC |
1875 | pg_data_t *pgdat = NODE_DATA(nid); |
1876 | unsigned long start_pfn = pgdat->node_start_pfn; | |
1877 | unsigned long end_pfn = start_pfn + pgdat->node_spanned_pages; | |
60a5a19e TC |
1878 | unsigned long pfn; |
1879 | ||
1880 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { | |
1881 | unsigned long section_nr = pfn_to_section_nr(pfn); | |
1882 | ||
1883 | if (!present_section_nr(section_nr)) | |
1884 | continue; | |
1885 | ||
1886 | if (pfn_to_nid(pfn) != nid) | |
1887 | continue; | |
1888 | ||
1889 | /* | |
1890 | * some memory sections of this node are not removed, and we | |
1891 | * can't offline node now. | |
1892 | */ | |
1893 | return; | |
1894 | } | |
1895 | ||
0f1cfe9d | 1896 | if (check_and_unmap_cpu_on_node(pgdat)) |
60a5a19e TC |
1897 | return; |
1898 | ||
1899 | /* | |
1900 | * all memory/cpu of this node are removed, we can offline this | |
1901 | * node now. | |
1902 | */ | |
1903 | node_set_offline(nid); | |
1904 | unregister_one_node(nid); | |
1905 | } | |
90b30cdc | 1906 | EXPORT_SYMBOL(try_offline_node); |
60a5a19e | 1907 | |
0f1cfe9d TK |
1908 | /** |
1909 | * remove_memory | |
1910 | * | |
1911 | * NOTE: The caller must call lock_device_hotplug() to serialize hotplug | |
1912 | * and online/offline operations before this call, as required by | |
1913 | * try_offline_node(). | |
1914 | */ | |
242831eb | 1915 | void __ref remove_memory(int nid, u64 start, u64 size) |
bbc76be6 | 1916 | { |
242831eb | 1917 | int ret; |
993c1aad | 1918 | |
27356f54 TK |
1919 | BUG_ON(check_hotplug_memory_range(start, size)); |
1920 | ||
bfc8c901 | 1921 | mem_hotplug_begin(); |
6677e3ea YI |
1922 | |
1923 | /* | |
242831eb RW |
1924 | * All memory blocks must be offlined before removing memory. Check |
1925 | * whether all memory blocks in question are offline and trigger a BUG() | |
1926 | * if this is not the case. | |
6677e3ea | 1927 | */ |
242831eb | 1928 | ret = walk_memory_range(PFN_DOWN(start), PFN_UP(start + size - 1), NULL, |
d6de9d53 | 1929 | check_memblock_offlined_cb); |
bfc8c901 | 1930 | if (ret) |
242831eb | 1931 | BUG(); |
6677e3ea | 1932 | |
46c66c4b YI |
1933 | /* remove memmap entry */ |
1934 | firmware_map_remove(start, start + size, "System RAM"); | |
f9126ab9 XQ |
1935 | memblock_free(start, size); |
1936 | memblock_remove(start, size); | |
46c66c4b | 1937 | |
24d335ca WC |
1938 | arch_remove_memory(start, size); |
1939 | ||
60a5a19e TC |
1940 | try_offline_node(nid); |
1941 | ||
bfc8c901 | 1942 | mem_hotplug_done(); |
71088785 | 1943 | } |
71088785 | 1944 | EXPORT_SYMBOL_GPL(remove_memory); |
aba6efc4 | 1945 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |