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Commit | Line | Data |
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3947be19 DH |
1 | /* |
2 | * linux/mm/memory_hotplug.c | |
3 | * | |
4 | * Copyright (C) | |
5 | */ | |
6 | ||
3947be19 DH |
7 | #include <linux/stddef.h> |
8 | #include <linux/mm.h> | |
174cd4b1 | 9 | #include <linux/sched/signal.h> |
3947be19 DH |
10 | #include <linux/swap.h> |
11 | #include <linux/interrupt.h> | |
12 | #include <linux/pagemap.h> | |
3947be19 | 13 | #include <linux/compiler.h> |
b95f1b31 | 14 | #include <linux/export.h> |
3947be19 | 15 | #include <linux/pagevec.h> |
2d1d43f6 | 16 | #include <linux/writeback.h> |
3947be19 DH |
17 | #include <linux/slab.h> |
18 | #include <linux/sysctl.h> | |
19 | #include <linux/cpu.h> | |
20 | #include <linux/memory.h> | |
4b94ffdc | 21 | #include <linux/memremap.h> |
3947be19 DH |
22 | #include <linux/memory_hotplug.h> |
23 | #include <linux/highmem.h> | |
24 | #include <linux/vmalloc.h> | |
0a547039 | 25 | #include <linux/ioport.h> |
0c0e6195 KH |
26 | #include <linux/delay.h> |
27 | #include <linux/migrate.h> | |
28 | #include <linux/page-isolation.h> | |
71088785 | 29 | #include <linux/pfn.h> |
6ad696d2 | 30 | #include <linux/suspend.h> |
6d9c285a | 31 | #include <linux/mm_inline.h> |
d96ae530 | 32 | #include <linux/firmware-map.h> |
60a5a19e | 33 | #include <linux/stop_machine.h> |
c8721bbb | 34 | #include <linux/hugetlb.h> |
c5320926 | 35 | #include <linux/memblock.h> |
f784a3f1 | 36 | #include <linux/bootmem.h> |
698b1b30 | 37 | #include <linux/compaction.h> |
3947be19 DH |
38 | |
39 | #include <asm/tlbflush.h> | |
40 | ||
1e5ad9a3 AB |
41 | #include "internal.h" |
42 | ||
9d0ad8ca DK |
43 | /* |
44 | * online_page_callback contains pointer to current page onlining function. | |
45 | * Initially it is generic_online_page(). If it is required it could be | |
46 | * changed by calling set_online_page_callback() for callback registration | |
47 | * and restore_online_page_callback() for generic callback restore. | |
48 | */ | |
49 | ||
50 | static void generic_online_page(struct page *page); | |
51 | ||
52 | static online_page_callback_t online_page_callback = generic_online_page; | |
bfc8c901 | 53 | static DEFINE_MUTEX(online_page_callback_lock); |
9d0ad8ca | 54 | |
bfc8c901 VD |
55 | /* The same as the cpu_hotplug lock, but for memory hotplug. */ |
56 | static struct { | |
57 | struct task_struct *active_writer; | |
58 | struct mutex lock; /* Synchronizes accesses to refcount, */ | |
59 | /* | |
60 | * Also blocks the new readers during | |
61 | * an ongoing mem hotplug operation. | |
62 | */ | |
63 | int refcount; | |
64 | ||
65 | #ifdef CONFIG_DEBUG_LOCK_ALLOC | |
66 | struct lockdep_map dep_map; | |
67 | #endif | |
68 | } mem_hotplug = { | |
69 | .active_writer = NULL, | |
70 | .lock = __MUTEX_INITIALIZER(mem_hotplug.lock), | |
71 | .refcount = 0, | |
72 | #ifdef CONFIG_DEBUG_LOCK_ALLOC | |
73 | .dep_map = {.name = "mem_hotplug.lock" }, | |
74 | #endif | |
75 | }; | |
76 | ||
77 | /* Lockdep annotations for get/put_online_mems() and mem_hotplug_begin/end() */ | |
78 | #define memhp_lock_acquire_read() lock_map_acquire_read(&mem_hotplug.dep_map) | |
79 | #define memhp_lock_acquire() lock_map_acquire(&mem_hotplug.dep_map) | |
80 | #define memhp_lock_release() lock_map_release(&mem_hotplug.dep_map) | |
81 | ||
8604d9e5 | 82 | #ifndef CONFIG_MEMORY_HOTPLUG_DEFAULT_ONLINE |
31bc3858 | 83 | bool memhp_auto_online; |
8604d9e5 VK |
84 | #else |
85 | bool memhp_auto_online = true; | |
86 | #endif | |
31bc3858 VK |
87 | EXPORT_SYMBOL_GPL(memhp_auto_online); |
88 | ||
86dd995d VK |
89 | static int __init setup_memhp_default_state(char *str) |
90 | { | |
91 | if (!strcmp(str, "online")) | |
92 | memhp_auto_online = true; | |
93 | else if (!strcmp(str, "offline")) | |
94 | memhp_auto_online = false; | |
95 | ||
96 | return 1; | |
97 | } | |
98 | __setup("memhp_default_state=", setup_memhp_default_state); | |
99 | ||
bfc8c901 VD |
100 | void get_online_mems(void) |
101 | { | |
102 | might_sleep(); | |
103 | if (mem_hotplug.active_writer == current) | |
104 | return; | |
105 | memhp_lock_acquire_read(); | |
106 | mutex_lock(&mem_hotplug.lock); | |
107 | mem_hotplug.refcount++; | |
108 | mutex_unlock(&mem_hotplug.lock); | |
109 | ||
110 | } | |
20d6c96b | 111 | |
bfc8c901 | 112 | void put_online_mems(void) |
20d6c96b | 113 | { |
bfc8c901 VD |
114 | if (mem_hotplug.active_writer == current) |
115 | return; | |
116 | mutex_lock(&mem_hotplug.lock); | |
117 | ||
118 | if (WARN_ON(!mem_hotplug.refcount)) | |
119 | mem_hotplug.refcount++; /* try to fix things up */ | |
120 | ||
121 | if (!--mem_hotplug.refcount && unlikely(mem_hotplug.active_writer)) | |
122 | wake_up_process(mem_hotplug.active_writer); | |
123 | mutex_unlock(&mem_hotplug.lock); | |
124 | memhp_lock_release(); | |
125 | ||
20d6c96b KM |
126 | } |
127 | ||
55adc1d0 HC |
128 | /* Serializes write accesses to mem_hotplug.active_writer. */ |
129 | static DEFINE_MUTEX(memory_add_remove_lock); | |
130 | ||
30467e0b | 131 | void mem_hotplug_begin(void) |
20d6c96b | 132 | { |
55adc1d0 | 133 | mutex_lock(&memory_add_remove_lock); |
3fc21924 | 134 | |
bfc8c901 VD |
135 | mem_hotplug.active_writer = current; |
136 | ||
137 | memhp_lock_acquire(); | |
138 | for (;;) { | |
139 | mutex_lock(&mem_hotplug.lock); | |
140 | if (likely(!mem_hotplug.refcount)) | |
141 | break; | |
142 | __set_current_state(TASK_UNINTERRUPTIBLE); | |
143 | mutex_unlock(&mem_hotplug.lock); | |
144 | schedule(); | |
145 | } | |
20d6c96b KM |
146 | } |
147 | ||
30467e0b | 148 | void mem_hotplug_done(void) |
bfc8c901 VD |
149 | { |
150 | mem_hotplug.active_writer = NULL; | |
151 | mutex_unlock(&mem_hotplug.lock); | |
152 | memhp_lock_release(); | |
55adc1d0 | 153 | mutex_unlock(&memory_add_remove_lock); |
bfc8c901 | 154 | } |
20d6c96b | 155 | |
45e0b78b KM |
156 | /* add this memory to iomem resource */ |
157 | static struct resource *register_memory_resource(u64 start, u64 size) | |
158 | { | |
159 | struct resource *res; | |
160 | res = kzalloc(sizeof(struct resource), GFP_KERNEL); | |
6f754ba4 VK |
161 | if (!res) |
162 | return ERR_PTR(-ENOMEM); | |
45e0b78b KM |
163 | |
164 | res->name = "System RAM"; | |
165 | res->start = start; | |
166 | res->end = start + size - 1; | |
782b8664 | 167 | res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; |
45e0b78b | 168 | if (request_resource(&iomem_resource, res) < 0) { |
4996eed8 | 169 | pr_debug("System RAM resource %pR cannot be added\n", res); |
45e0b78b | 170 | kfree(res); |
6f754ba4 | 171 | return ERR_PTR(-EEXIST); |
45e0b78b KM |
172 | } |
173 | return res; | |
174 | } | |
175 | ||
176 | static void release_memory_resource(struct resource *res) | |
177 | { | |
178 | if (!res) | |
179 | return; | |
180 | release_resource(res); | |
181 | kfree(res); | |
182 | return; | |
183 | } | |
184 | ||
53947027 | 185 | #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE |
46723bfa YI |
186 | void get_page_bootmem(unsigned long info, struct page *page, |
187 | unsigned long type) | |
04753278 | 188 | { |
ddffe98d | 189 | page->freelist = (void *)type; |
04753278 YG |
190 | SetPagePrivate(page); |
191 | set_page_private(page, info); | |
fe896d18 | 192 | page_ref_inc(page); |
04753278 YG |
193 | } |
194 | ||
170a5a7e | 195 | void put_page_bootmem(struct page *page) |
04753278 | 196 | { |
5f24ce5f | 197 | unsigned long type; |
04753278 | 198 | |
ddffe98d | 199 | type = (unsigned long) page->freelist; |
5f24ce5f AA |
200 | BUG_ON(type < MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE || |
201 | type > MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE); | |
04753278 | 202 | |
fe896d18 | 203 | if (page_ref_dec_return(page) == 1) { |
ddffe98d | 204 | page->freelist = NULL; |
04753278 YG |
205 | ClearPagePrivate(page); |
206 | set_page_private(page, 0); | |
5f24ce5f | 207 | INIT_LIST_HEAD(&page->lru); |
170a5a7e | 208 | free_reserved_page(page); |
04753278 | 209 | } |
04753278 YG |
210 | } |
211 | ||
46723bfa YI |
212 | #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE |
213 | #ifndef CONFIG_SPARSEMEM_VMEMMAP | |
d92bc318 | 214 | static void register_page_bootmem_info_section(unsigned long start_pfn) |
04753278 YG |
215 | { |
216 | unsigned long *usemap, mapsize, section_nr, i; | |
217 | struct mem_section *ms; | |
218 | struct page *page, *memmap; | |
219 | ||
04753278 YG |
220 | section_nr = pfn_to_section_nr(start_pfn); |
221 | ms = __nr_to_section(section_nr); | |
222 | ||
223 | /* Get section's memmap address */ | |
224 | memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); | |
225 | ||
226 | /* | |
227 | * Get page for the memmap's phys address | |
228 | * XXX: need more consideration for sparse_vmemmap... | |
229 | */ | |
230 | page = virt_to_page(memmap); | |
231 | mapsize = sizeof(struct page) * PAGES_PER_SECTION; | |
232 | mapsize = PAGE_ALIGN(mapsize) >> PAGE_SHIFT; | |
233 | ||
234 | /* remember memmap's page */ | |
235 | for (i = 0; i < mapsize; i++, page++) | |
236 | get_page_bootmem(section_nr, page, SECTION_INFO); | |
237 | ||
238 | usemap = __nr_to_section(section_nr)->pageblock_flags; | |
239 | page = virt_to_page(usemap); | |
240 | ||
241 | mapsize = PAGE_ALIGN(usemap_size()) >> PAGE_SHIFT; | |
242 | ||
243 | for (i = 0; i < mapsize; i++, page++) | |
af370fb8 | 244 | get_page_bootmem(section_nr, page, MIX_SECTION_INFO); |
04753278 YG |
245 | |
246 | } | |
46723bfa YI |
247 | #else /* CONFIG_SPARSEMEM_VMEMMAP */ |
248 | static void register_page_bootmem_info_section(unsigned long start_pfn) | |
249 | { | |
250 | unsigned long *usemap, mapsize, section_nr, i; | |
251 | struct mem_section *ms; | |
252 | struct page *page, *memmap; | |
253 | ||
254 | if (!pfn_valid(start_pfn)) | |
255 | return; | |
256 | ||
257 | section_nr = pfn_to_section_nr(start_pfn); | |
258 | ms = __nr_to_section(section_nr); | |
259 | ||
260 | memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); | |
261 | ||
262 | register_page_bootmem_memmap(section_nr, memmap, PAGES_PER_SECTION); | |
263 | ||
264 | usemap = __nr_to_section(section_nr)->pageblock_flags; | |
265 | page = virt_to_page(usemap); | |
266 | ||
267 | mapsize = PAGE_ALIGN(usemap_size()) >> PAGE_SHIFT; | |
268 | ||
269 | for (i = 0; i < mapsize; i++, page++) | |
270 | get_page_bootmem(section_nr, page, MIX_SECTION_INFO); | |
271 | } | |
272 | #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ | |
04753278 | 273 | |
7ded384a | 274 | void __init register_page_bootmem_info_node(struct pglist_data *pgdat) |
04753278 YG |
275 | { |
276 | unsigned long i, pfn, end_pfn, nr_pages; | |
277 | int node = pgdat->node_id; | |
278 | struct page *page; | |
04753278 YG |
279 | |
280 | nr_pages = PAGE_ALIGN(sizeof(struct pglist_data)) >> PAGE_SHIFT; | |
281 | page = virt_to_page(pgdat); | |
282 | ||
283 | for (i = 0; i < nr_pages; i++, page++) | |
284 | get_page_bootmem(node, page, NODE_INFO); | |
285 | ||
04753278 | 286 | pfn = pgdat->node_start_pfn; |
c1f19495 | 287 | end_pfn = pgdat_end_pfn(pgdat); |
04753278 | 288 | |
7e9f5eb0 | 289 | /* register section info */ |
f14851af | 290 | for (; pfn < end_pfn; pfn += PAGES_PER_SECTION) { |
291 | /* | |
292 | * Some platforms can assign the same pfn to multiple nodes - on | |
293 | * node0 as well as nodeN. To avoid registering a pfn against | |
294 | * multiple nodes we check that this pfn does not already | |
7e9f5eb0 | 295 | * reside in some other nodes. |
f14851af | 296 | */ |
f65e91df | 297 | if (pfn_valid(pfn) && (early_pfn_to_nid(pfn) == node)) |
f14851af | 298 | register_page_bootmem_info_section(pfn); |
299 | } | |
04753278 | 300 | } |
46723bfa | 301 | #endif /* CONFIG_HAVE_BOOTMEM_INFO_NODE */ |
04753278 | 302 | |
f2765404 FF |
303 | static void __meminit grow_zone_span(struct zone *zone, unsigned long start_pfn, |
304 | unsigned long end_pfn) | |
76cdd58e HC |
305 | { |
306 | unsigned long old_zone_end_pfn; | |
307 | ||
308 | zone_span_writelock(zone); | |
309 | ||
c33bc315 | 310 | old_zone_end_pfn = zone_end_pfn(zone); |
8080fc03 | 311 | if (zone_is_empty(zone) || start_pfn < zone->zone_start_pfn) |
76cdd58e HC |
312 | zone->zone_start_pfn = start_pfn; |
313 | ||
314 | zone->spanned_pages = max(old_zone_end_pfn, end_pfn) - | |
315 | zone->zone_start_pfn; | |
316 | ||
317 | zone_span_writeunlock(zone); | |
318 | } | |
319 | ||
511c2aba LJ |
320 | static void resize_zone(struct zone *zone, unsigned long start_pfn, |
321 | unsigned long end_pfn) | |
322 | { | |
323 | zone_span_writelock(zone); | |
324 | ||
e455a9b9 LJ |
325 | if (end_pfn - start_pfn) { |
326 | zone->zone_start_pfn = start_pfn; | |
327 | zone->spanned_pages = end_pfn - start_pfn; | |
328 | } else { | |
329 | /* | |
330 | * make it consist as free_area_init_core(), | |
331 | * if spanned_pages = 0, then keep start_pfn = 0 | |
332 | */ | |
333 | zone->zone_start_pfn = 0; | |
334 | zone->spanned_pages = 0; | |
335 | } | |
511c2aba LJ |
336 | |
337 | zone_span_writeunlock(zone); | |
338 | } | |
339 | ||
340 | static void fix_zone_id(struct zone *zone, unsigned long start_pfn, | |
341 | unsigned long end_pfn) | |
342 | { | |
343 | enum zone_type zid = zone_idx(zone); | |
344 | int nid = zone->zone_pgdat->node_id; | |
345 | unsigned long pfn; | |
346 | ||
347 | for (pfn = start_pfn; pfn < end_pfn; pfn++) | |
348 | set_page_links(pfn_to_page(pfn), zid, nid, pfn); | |
349 | } | |
350 | ||
dc0bbf3b | 351 | static void __ref ensure_zone_is_initialized(struct zone *zone, |
f6bbb78e CS |
352 | unsigned long start_pfn, unsigned long num_pages) |
353 | { | |
354 | if (!zone_is_initialized(zone)) | |
dc0bbf3b | 355 | init_currently_empty_zone(zone, start_pfn, num_pages); |
f6bbb78e CS |
356 | } |
357 | ||
e455a9b9 | 358 | static int __meminit move_pfn_range_left(struct zone *z1, struct zone *z2, |
511c2aba LJ |
359 | unsigned long start_pfn, unsigned long end_pfn) |
360 | { | |
361 | unsigned long flags; | |
e455a9b9 LJ |
362 | unsigned long z1_start_pfn; |
363 | ||
dc0bbf3b | 364 | ensure_zone_is_initialized(z1, start_pfn, end_pfn - start_pfn); |
511c2aba LJ |
365 | |
366 | pgdat_resize_lock(z1->zone_pgdat, &flags); | |
367 | ||
368 | /* can't move pfns which are higher than @z2 */ | |
108bcc96 | 369 | if (end_pfn > zone_end_pfn(z2)) |
511c2aba | 370 | goto out_fail; |
834405c3 | 371 | /* the move out part must be at the left most of @z2 */ |
511c2aba LJ |
372 | if (start_pfn > z2->zone_start_pfn) |
373 | goto out_fail; | |
374 | /* must included/overlap */ | |
375 | if (end_pfn <= z2->zone_start_pfn) | |
376 | goto out_fail; | |
377 | ||
e455a9b9 | 378 | /* use start_pfn for z1's start_pfn if z1 is empty */ |
8080fc03 | 379 | if (!zone_is_empty(z1)) |
e455a9b9 LJ |
380 | z1_start_pfn = z1->zone_start_pfn; |
381 | else | |
382 | z1_start_pfn = start_pfn; | |
383 | ||
384 | resize_zone(z1, z1_start_pfn, end_pfn); | |
108bcc96 | 385 | resize_zone(z2, end_pfn, zone_end_pfn(z2)); |
511c2aba LJ |
386 | |
387 | pgdat_resize_unlock(z1->zone_pgdat, &flags); | |
388 | ||
389 | fix_zone_id(z1, start_pfn, end_pfn); | |
390 | ||
391 | return 0; | |
392 | out_fail: | |
393 | pgdat_resize_unlock(z1->zone_pgdat, &flags); | |
394 | return -1; | |
395 | } | |
396 | ||
e455a9b9 | 397 | static int __meminit move_pfn_range_right(struct zone *z1, struct zone *z2, |
511c2aba LJ |
398 | unsigned long start_pfn, unsigned long end_pfn) |
399 | { | |
400 | unsigned long flags; | |
e455a9b9 LJ |
401 | unsigned long z2_end_pfn; |
402 | ||
dc0bbf3b | 403 | ensure_zone_is_initialized(z2, start_pfn, end_pfn - start_pfn); |
511c2aba LJ |
404 | |
405 | pgdat_resize_lock(z1->zone_pgdat, &flags); | |
406 | ||
407 | /* can't move pfns which are lower than @z1 */ | |
408 | if (z1->zone_start_pfn > start_pfn) | |
409 | goto out_fail; | |
410 | /* the move out part mast at the right most of @z1 */ | |
108bcc96 | 411 | if (zone_end_pfn(z1) > end_pfn) |
511c2aba LJ |
412 | goto out_fail; |
413 | /* must included/overlap */ | |
108bcc96 | 414 | if (start_pfn >= zone_end_pfn(z1)) |
511c2aba LJ |
415 | goto out_fail; |
416 | ||
e455a9b9 | 417 | /* use end_pfn for z2's end_pfn if z2 is empty */ |
8080fc03 | 418 | if (!zone_is_empty(z2)) |
108bcc96 | 419 | z2_end_pfn = zone_end_pfn(z2); |
e455a9b9 LJ |
420 | else |
421 | z2_end_pfn = end_pfn; | |
422 | ||
511c2aba | 423 | resize_zone(z1, z1->zone_start_pfn, start_pfn); |
e455a9b9 | 424 | resize_zone(z2, start_pfn, z2_end_pfn); |
511c2aba LJ |
425 | |
426 | pgdat_resize_unlock(z1->zone_pgdat, &flags); | |
427 | ||
428 | fix_zone_id(z2, start_pfn, end_pfn); | |
429 | ||
430 | return 0; | |
431 | out_fail: | |
432 | pgdat_resize_unlock(z1->zone_pgdat, &flags); | |
433 | return -1; | |
434 | } | |
435 | ||
e51e6c8f RA |
436 | static struct zone * __meminit move_pfn_range(int zone_shift, |
437 | unsigned long start_pfn, unsigned long end_pfn) | |
438 | { | |
439 | struct zone *zone = page_zone(pfn_to_page(start_pfn)); | |
440 | int ret = 0; | |
441 | ||
442 | if (zone_shift < 0) | |
443 | ret = move_pfn_range_left(zone + zone_shift, zone, | |
444 | start_pfn, end_pfn); | |
445 | else if (zone_shift) | |
446 | ret = move_pfn_range_right(zone, zone + zone_shift, | |
447 | start_pfn, end_pfn); | |
448 | ||
449 | if (ret) | |
450 | return NULL; | |
451 | ||
452 | return zone + zone_shift; | |
453 | } | |
454 | ||
f2765404 FF |
455 | static void __meminit grow_pgdat_span(struct pglist_data *pgdat, unsigned long start_pfn, |
456 | unsigned long end_pfn) | |
76cdd58e | 457 | { |
83285c72 | 458 | unsigned long old_pgdat_end_pfn = pgdat_end_pfn(pgdat); |
76cdd58e | 459 | |
712cd386 | 460 | if (!pgdat->node_spanned_pages || start_pfn < pgdat->node_start_pfn) |
76cdd58e HC |
461 | pgdat->node_start_pfn = start_pfn; |
462 | ||
463 | pgdat->node_spanned_pages = max(old_pgdat_end_pfn, end_pfn) - | |
464 | pgdat->node_start_pfn; | |
465 | } | |
466 | ||
31168481 | 467 | static int __meminit __add_zone(struct zone *zone, unsigned long phys_start_pfn) |
3947be19 DH |
468 | { |
469 | struct pglist_data *pgdat = zone->zone_pgdat; | |
470 | int nr_pages = PAGES_PER_SECTION; | |
471 | int nid = pgdat->node_id; | |
472 | int zone_type; | |
e298ff75 | 473 | unsigned long flags, pfn; |
3947be19 DH |
474 | |
475 | zone_type = zone - pgdat->node_zones; | |
dc0bbf3b | 476 | ensure_zone_is_initialized(zone, phys_start_pfn, nr_pages); |
76cdd58e | 477 | |
76cdd58e HC |
478 | pgdat_resize_lock(zone->zone_pgdat, &flags); |
479 | grow_zone_span(zone, phys_start_pfn, phys_start_pfn + nr_pages); | |
480 | grow_pgdat_span(zone->zone_pgdat, phys_start_pfn, | |
481 | phys_start_pfn + nr_pages); | |
482 | pgdat_resize_unlock(zone->zone_pgdat, &flags); | |
a2f3aa02 DH |
483 | memmap_init_zone(nr_pages, nid, zone_type, |
484 | phys_start_pfn, MEMMAP_HOTPLUG); | |
e298ff75 MG |
485 | |
486 | /* online_page_range is called later and expects pages reserved */ | |
487 | for (pfn = phys_start_pfn; pfn < phys_start_pfn + nr_pages; pfn++) { | |
488 | if (!pfn_valid(pfn)) | |
489 | continue; | |
490 | ||
491 | SetPageReserved(pfn_to_page(pfn)); | |
492 | } | |
718127cc | 493 | return 0; |
3947be19 DH |
494 | } |
495 | ||
c04fc586 | 496 | static int __meminit __add_section(int nid, struct zone *zone, |
1b862aec | 497 | unsigned long phys_start_pfn, bool want_memblock) |
3947be19 | 498 | { |
3947be19 DH |
499 | int ret; |
500 | ||
ebd15302 KH |
501 | if (pfn_valid(phys_start_pfn)) |
502 | return -EEXIST; | |
503 | ||
85b35fea | 504 | ret = sparse_add_one_section(zone, phys_start_pfn); |
3947be19 DH |
505 | |
506 | if (ret < 0) | |
507 | return ret; | |
508 | ||
718127cc YG |
509 | ret = __add_zone(zone, phys_start_pfn); |
510 | ||
511 | if (ret < 0) | |
512 | return ret; | |
513 | ||
1b862aec MH |
514 | if (!want_memblock) |
515 | return 0; | |
516 | ||
c04fc586 | 517 | return register_new_memory(nid, __pfn_to_section(phys_start_pfn)); |
3947be19 DH |
518 | } |
519 | ||
4edd7cef DR |
520 | /* |
521 | * Reasonably generic function for adding memory. It is | |
522 | * expected that archs that support memory hotplug will | |
523 | * call this function after deciding the zone to which to | |
524 | * add the new pages. | |
525 | */ | |
526 | int __ref __add_pages(int nid, struct zone *zone, unsigned long phys_start_pfn, | |
1b862aec | 527 | unsigned long nr_pages, bool want_memblock) |
4edd7cef DR |
528 | { |
529 | unsigned long i; | |
530 | int err = 0; | |
531 | int start_sec, end_sec; | |
4b94ffdc DW |
532 | struct vmem_altmap *altmap; |
533 | ||
7cf91a98 JK |
534 | clear_zone_contiguous(zone); |
535 | ||
4edd7cef DR |
536 | /* during initialize mem_map, align hot-added range to section */ |
537 | start_sec = pfn_to_section_nr(phys_start_pfn); | |
538 | end_sec = pfn_to_section_nr(phys_start_pfn + nr_pages - 1); | |
539 | ||
4b94ffdc DW |
540 | altmap = to_vmem_altmap((unsigned long) pfn_to_page(phys_start_pfn)); |
541 | if (altmap) { | |
542 | /* | |
543 | * Validate altmap is within bounds of the total request | |
544 | */ | |
545 | if (altmap->base_pfn != phys_start_pfn | |
546 | || vmem_altmap_offset(altmap) > nr_pages) { | |
547 | pr_warn_once("memory add fail, invalid altmap\n"); | |
7cf91a98 JK |
548 | err = -EINVAL; |
549 | goto out; | |
4b94ffdc DW |
550 | } |
551 | altmap->alloc = 0; | |
552 | } | |
553 | ||
4edd7cef | 554 | for (i = start_sec; i <= end_sec; i++) { |
1b862aec | 555 | err = __add_section(nid, zone, section_nr_to_pfn(i), want_memblock); |
4edd7cef DR |
556 | |
557 | /* | |
558 | * EEXIST is finally dealt with by ioresource collision | |
559 | * check. see add_memory() => register_memory_resource() | |
560 | * Warning will be printed if there is collision. | |
561 | */ | |
562 | if (err && (err != -EEXIST)) | |
563 | break; | |
564 | err = 0; | |
565 | } | |
c435a390 | 566 | vmemmap_populate_print_last(); |
7cf91a98 JK |
567 | out: |
568 | set_zone_contiguous(zone); | |
4edd7cef DR |
569 | return err; |
570 | } | |
571 | EXPORT_SYMBOL_GPL(__add_pages); | |
572 | ||
573 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
815121d2 YI |
574 | /* find the smallest valid pfn in the range [start_pfn, end_pfn) */ |
575 | static int find_smallest_section_pfn(int nid, struct zone *zone, | |
576 | unsigned long start_pfn, | |
577 | unsigned long end_pfn) | |
578 | { | |
579 | struct mem_section *ms; | |
580 | ||
581 | for (; start_pfn < end_pfn; start_pfn += PAGES_PER_SECTION) { | |
582 | ms = __pfn_to_section(start_pfn); | |
583 | ||
584 | if (unlikely(!valid_section(ms))) | |
585 | continue; | |
586 | ||
587 | if (unlikely(pfn_to_nid(start_pfn) != nid)) | |
588 | continue; | |
589 | ||
590 | if (zone && zone != page_zone(pfn_to_page(start_pfn))) | |
591 | continue; | |
592 | ||
593 | return start_pfn; | |
594 | } | |
595 | ||
596 | return 0; | |
597 | } | |
598 | ||
599 | /* find the biggest valid pfn in the range [start_pfn, end_pfn). */ | |
600 | static int find_biggest_section_pfn(int nid, struct zone *zone, | |
601 | unsigned long start_pfn, | |
602 | unsigned long end_pfn) | |
603 | { | |
604 | struct mem_section *ms; | |
605 | unsigned long pfn; | |
606 | ||
607 | /* pfn is the end pfn of a memory section. */ | |
608 | pfn = end_pfn - 1; | |
609 | for (; pfn >= start_pfn; pfn -= PAGES_PER_SECTION) { | |
610 | ms = __pfn_to_section(pfn); | |
611 | ||
612 | if (unlikely(!valid_section(ms))) | |
613 | continue; | |
614 | ||
615 | if (unlikely(pfn_to_nid(pfn) != nid)) | |
616 | continue; | |
617 | ||
618 | if (zone && zone != page_zone(pfn_to_page(pfn))) | |
619 | continue; | |
620 | ||
621 | return pfn; | |
622 | } | |
623 | ||
624 | return 0; | |
625 | } | |
626 | ||
627 | static void shrink_zone_span(struct zone *zone, unsigned long start_pfn, | |
628 | unsigned long end_pfn) | |
629 | { | |
c33bc315 XQ |
630 | unsigned long zone_start_pfn = zone->zone_start_pfn; |
631 | unsigned long z = zone_end_pfn(zone); /* zone_end_pfn namespace clash */ | |
632 | unsigned long zone_end_pfn = z; | |
815121d2 YI |
633 | unsigned long pfn; |
634 | struct mem_section *ms; | |
635 | int nid = zone_to_nid(zone); | |
636 | ||
637 | zone_span_writelock(zone); | |
638 | if (zone_start_pfn == start_pfn) { | |
639 | /* | |
640 | * If the section is smallest section in the zone, it need | |
641 | * shrink zone->zone_start_pfn and zone->zone_spanned_pages. | |
642 | * In this case, we find second smallest valid mem_section | |
643 | * for shrinking zone. | |
644 | */ | |
645 | pfn = find_smallest_section_pfn(nid, zone, end_pfn, | |
646 | zone_end_pfn); | |
647 | if (pfn) { | |
648 | zone->zone_start_pfn = pfn; | |
649 | zone->spanned_pages = zone_end_pfn - pfn; | |
650 | } | |
651 | } else if (zone_end_pfn == end_pfn) { | |
652 | /* | |
653 | * If the section is biggest section in the zone, it need | |
654 | * shrink zone->spanned_pages. | |
655 | * In this case, we find second biggest valid mem_section for | |
656 | * shrinking zone. | |
657 | */ | |
658 | pfn = find_biggest_section_pfn(nid, zone, zone_start_pfn, | |
659 | start_pfn); | |
660 | if (pfn) | |
661 | zone->spanned_pages = pfn - zone_start_pfn + 1; | |
662 | } | |
663 | ||
664 | /* | |
665 | * The section is not biggest or smallest mem_section in the zone, it | |
666 | * only creates a hole in the zone. So in this case, we need not | |
667 | * change the zone. But perhaps, the zone has only hole data. Thus | |
668 | * it check the zone has only hole or not. | |
669 | */ | |
670 | pfn = zone_start_pfn; | |
671 | for (; pfn < zone_end_pfn; pfn += PAGES_PER_SECTION) { | |
672 | ms = __pfn_to_section(pfn); | |
673 | ||
674 | if (unlikely(!valid_section(ms))) | |
675 | continue; | |
676 | ||
677 | if (page_zone(pfn_to_page(pfn)) != zone) | |
678 | continue; | |
679 | ||
680 | /* If the section is current section, it continues the loop */ | |
681 | if (start_pfn == pfn) | |
682 | continue; | |
683 | ||
684 | /* If we find valid section, we have nothing to do */ | |
685 | zone_span_writeunlock(zone); | |
686 | return; | |
687 | } | |
688 | ||
689 | /* The zone has no valid section */ | |
690 | zone->zone_start_pfn = 0; | |
691 | zone->spanned_pages = 0; | |
692 | zone_span_writeunlock(zone); | |
693 | } | |
694 | ||
695 | static void shrink_pgdat_span(struct pglist_data *pgdat, | |
696 | unsigned long start_pfn, unsigned long end_pfn) | |
697 | { | |
83285c72 XQ |
698 | unsigned long pgdat_start_pfn = pgdat->node_start_pfn; |
699 | unsigned long p = pgdat_end_pfn(pgdat); /* pgdat_end_pfn namespace clash */ | |
700 | unsigned long pgdat_end_pfn = p; | |
815121d2 YI |
701 | unsigned long pfn; |
702 | struct mem_section *ms; | |
703 | int nid = pgdat->node_id; | |
704 | ||
705 | if (pgdat_start_pfn == start_pfn) { | |
706 | /* | |
707 | * If the section is smallest section in the pgdat, it need | |
708 | * shrink pgdat->node_start_pfn and pgdat->node_spanned_pages. | |
709 | * In this case, we find second smallest valid mem_section | |
710 | * for shrinking zone. | |
711 | */ | |
712 | pfn = find_smallest_section_pfn(nid, NULL, end_pfn, | |
713 | pgdat_end_pfn); | |
714 | if (pfn) { | |
715 | pgdat->node_start_pfn = pfn; | |
716 | pgdat->node_spanned_pages = pgdat_end_pfn - pfn; | |
717 | } | |
718 | } else if (pgdat_end_pfn == end_pfn) { | |
719 | /* | |
720 | * If the section is biggest section in the pgdat, it need | |
721 | * shrink pgdat->node_spanned_pages. | |
722 | * In this case, we find second biggest valid mem_section for | |
723 | * shrinking zone. | |
724 | */ | |
725 | pfn = find_biggest_section_pfn(nid, NULL, pgdat_start_pfn, | |
726 | start_pfn); | |
727 | if (pfn) | |
728 | pgdat->node_spanned_pages = pfn - pgdat_start_pfn + 1; | |
729 | } | |
730 | ||
731 | /* | |
732 | * If the section is not biggest or smallest mem_section in the pgdat, | |
733 | * it only creates a hole in the pgdat. So in this case, we need not | |
734 | * change the pgdat. | |
735 | * But perhaps, the pgdat has only hole data. Thus it check the pgdat | |
736 | * has only hole or not. | |
737 | */ | |
738 | pfn = pgdat_start_pfn; | |
739 | for (; pfn < pgdat_end_pfn; pfn += PAGES_PER_SECTION) { | |
740 | ms = __pfn_to_section(pfn); | |
741 | ||
742 | if (unlikely(!valid_section(ms))) | |
743 | continue; | |
744 | ||
745 | if (pfn_to_nid(pfn) != nid) | |
746 | continue; | |
747 | ||
748 | /* If the section is current section, it continues the loop */ | |
749 | if (start_pfn == pfn) | |
750 | continue; | |
751 | ||
752 | /* If we find valid section, we have nothing to do */ | |
753 | return; | |
754 | } | |
755 | ||
756 | /* The pgdat has no valid section */ | |
757 | pgdat->node_start_pfn = 0; | |
758 | pgdat->node_spanned_pages = 0; | |
759 | } | |
760 | ||
761 | static void __remove_zone(struct zone *zone, unsigned long start_pfn) | |
762 | { | |
763 | struct pglist_data *pgdat = zone->zone_pgdat; | |
764 | int nr_pages = PAGES_PER_SECTION; | |
765 | int zone_type; | |
766 | unsigned long flags; | |
767 | ||
768 | zone_type = zone - pgdat->node_zones; | |
769 | ||
770 | pgdat_resize_lock(zone->zone_pgdat, &flags); | |
771 | shrink_zone_span(zone, start_pfn, start_pfn + nr_pages); | |
772 | shrink_pgdat_span(pgdat, start_pfn, start_pfn + nr_pages); | |
773 | pgdat_resize_unlock(zone->zone_pgdat, &flags); | |
774 | } | |
775 | ||
4b94ffdc DW |
776 | static int __remove_section(struct zone *zone, struct mem_section *ms, |
777 | unsigned long map_offset) | |
ea01ea93 | 778 | { |
815121d2 YI |
779 | unsigned long start_pfn; |
780 | int scn_nr; | |
ea01ea93 BP |
781 | int ret = -EINVAL; |
782 | ||
783 | if (!valid_section(ms)) | |
784 | return ret; | |
785 | ||
786 | ret = unregister_memory_section(ms); | |
787 | if (ret) | |
788 | return ret; | |
789 | ||
815121d2 YI |
790 | scn_nr = __section_nr(ms); |
791 | start_pfn = section_nr_to_pfn(scn_nr); | |
792 | __remove_zone(zone, start_pfn); | |
793 | ||
4b94ffdc | 794 | sparse_remove_one_section(zone, ms, map_offset); |
ea01ea93 BP |
795 | return 0; |
796 | } | |
797 | ||
ea01ea93 BP |
798 | /** |
799 | * __remove_pages() - remove sections of pages from a zone | |
800 | * @zone: zone from which pages need to be removed | |
801 | * @phys_start_pfn: starting pageframe (must be aligned to start of a section) | |
802 | * @nr_pages: number of pages to remove (must be multiple of section size) | |
803 | * | |
804 | * Generic helper function to remove section mappings and sysfs entries | |
805 | * for the section of the memory we are removing. Caller needs to make | |
806 | * sure that pages are marked reserved and zones are adjust properly by | |
807 | * calling offline_pages(). | |
808 | */ | |
809 | int __remove_pages(struct zone *zone, unsigned long phys_start_pfn, | |
810 | unsigned long nr_pages) | |
811 | { | |
fe74ebb1 | 812 | unsigned long i; |
4b94ffdc DW |
813 | unsigned long map_offset = 0; |
814 | int sections_to_remove, ret = 0; | |
815 | ||
816 | /* In the ZONE_DEVICE case device driver owns the memory region */ | |
817 | if (is_dev_zone(zone)) { | |
818 | struct page *page = pfn_to_page(phys_start_pfn); | |
819 | struct vmem_altmap *altmap; | |
820 | ||
821 | altmap = to_vmem_altmap((unsigned long) page); | |
822 | if (altmap) | |
823 | map_offset = vmem_altmap_offset(altmap); | |
824 | } else { | |
825 | resource_size_t start, size; | |
826 | ||
827 | start = phys_start_pfn << PAGE_SHIFT; | |
828 | size = nr_pages * PAGE_SIZE; | |
829 | ||
830 | ret = release_mem_region_adjustable(&iomem_resource, start, | |
831 | size); | |
832 | if (ret) { | |
833 | resource_size_t endres = start + size - 1; | |
834 | ||
835 | pr_warn("Unable to release resource <%pa-%pa> (%d)\n", | |
836 | &start, &endres, ret); | |
837 | } | |
838 | } | |
ea01ea93 | 839 | |
7cf91a98 JK |
840 | clear_zone_contiguous(zone); |
841 | ||
ea01ea93 BP |
842 | /* |
843 | * We can only remove entire sections | |
844 | */ | |
845 | BUG_ON(phys_start_pfn & ~PAGE_SECTION_MASK); | |
846 | BUG_ON(nr_pages % PAGES_PER_SECTION); | |
847 | ||
ea01ea93 BP |
848 | sections_to_remove = nr_pages / PAGES_PER_SECTION; |
849 | for (i = 0; i < sections_to_remove; i++) { | |
850 | unsigned long pfn = phys_start_pfn + i*PAGES_PER_SECTION; | |
4b94ffdc DW |
851 | |
852 | ret = __remove_section(zone, __pfn_to_section(pfn), map_offset); | |
853 | map_offset = 0; | |
ea01ea93 BP |
854 | if (ret) |
855 | break; | |
856 | } | |
7cf91a98 JK |
857 | |
858 | set_zone_contiguous(zone); | |
859 | ||
ea01ea93 BP |
860 | return ret; |
861 | } | |
4edd7cef | 862 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
ea01ea93 | 863 | |
9d0ad8ca DK |
864 | int set_online_page_callback(online_page_callback_t callback) |
865 | { | |
866 | int rc = -EINVAL; | |
867 | ||
bfc8c901 VD |
868 | get_online_mems(); |
869 | mutex_lock(&online_page_callback_lock); | |
9d0ad8ca DK |
870 | |
871 | if (online_page_callback == generic_online_page) { | |
872 | online_page_callback = callback; | |
873 | rc = 0; | |
874 | } | |
875 | ||
bfc8c901 VD |
876 | mutex_unlock(&online_page_callback_lock); |
877 | put_online_mems(); | |
9d0ad8ca DK |
878 | |
879 | return rc; | |
880 | } | |
881 | EXPORT_SYMBOL_GPL(set_online_page_callback); | |
882 | ||
883 | int restore_online_page_callback(online_page_callback_t callback) | |
884 | { | |
885 | int rc = -EINVAL; | |
886 | ||
bfc8c901 VD |
887 | get_online_mems(); |
888 | mutex_lock(&online_page_callback_lock); | |
9d0ad8ca DK |
889 | |
890 | if (online_page_callback == callback) { | |
891 | online_page_callback = generic_online_page; | |
892 | rc = 0; | |
893 | } | |
894 | ||
bfc8c901 VD |
895 | mutex_unlock(&online_page_callback_lock); |
896 | put_online_mems(); | |
9d0ad8ca DK |
897 | |
898 | return rc; | |
899 | } | |
900 | EXPORT_SYMBOL_GPL(restore_online_page_callback); | |
901 | ||
902 | void __online_page_set_limits(struct page *page) | |
180c06ef | 903 | { |
9d0ad8ca DK |
904 | } |
905 | EXPORT_SYMBOL_GPL(__online_page_set_limits); | |
906 | ||
907 | void __online_page_increment_counters(struct page *page) | |
908 | { | |
3dcc0571 | 909 | adjust_managed_page_count(page, 1); |
9d0ad8ca DK |
910 | } |
911 | EXPORT_SYMBOL_GPL(__online_page_increment_counters); | |
180c06ef | 912 | |
9d0ad8ca DK |
913 | void __online_page_free(struct page *page) |
914 | { | |
3dcc0571 | 915 | __free_reserved_page(page); |
180c06ef | 916 | } |
9d0ad8ca DK |
917 | EXPORT_SYMBOL_GPL(__online_page_free); |
918 | ||
919 | static void generic_online_page(struct page *page) | |
920 | { | |
921 | __online_page_set_limits(page); | |
922 | __online_page_increment_counters(page); | |
923 | __online_page_free(page); | |
924 | } | |
180c06ef | 925 | |
75884fb1 KH |
926 | static int online_pages_range(unsigned long start_pfn, unsigned long nr_pages, |
927 | void *arg) | |
3947be19 DH |
928 | { |
929 | unsigned long i; | |
75884fb1 KH |
930 | unsigned long onlined_pages = *(unsigned long *)arg; |
931 | struct page *page; | |
932 | if (PageReserved(pfn_to_page(start_pfn))) | |
933 | for (i = 0; i < nr_pages; i++) { | |
934 | page = pfn_to_page(start_pfn + i); | |
9d0ad8ca | 935 | (*online_page_callback)(page); |
75884fb1 KH |
936 | onlined_pages++; |
937 | } | |
938 | *(unsigned long *)arg = onlined_pages; | |
939 | return 0; | |
940 | } | |
941 | ||
09285af7 | 942 | #ifdef CONFIG_MOVABLE_NODE |
79a4dcef TC |
943 | /* |
944 | * When CONFIG_MOVABLE_NODE, we permit onlining of a node which doesn't have | |
945 | * normal memory. | |
946 | */ | |
c8f95657 | 947 | static bool can_online_high_movable(int nid) |
09285af7 LJ |
948 | { |
949 | return true; | |
950 | } | |
79a4dcef | 951 | #else /* CONFIG_MOVABLE_NODE */ |
74d42d8f | 952 | /* ensure every online node has NORMAL memory */ |
c8f95657 | 953 | static bool can_online_high_movable(int nid) |
74d42d8f | 954 | { |
c8f95657 | 955 | return node_state(nid, N_NORMAL_MEMORY); |
74d42d8f | 956 | } |
79a4dcef | 957 | #endif /* CONFIG_MOVABLE_NODE */ |
74d42d8f | 958 | |
d9713679 LJ |
959 | /* check which state of node_states will be changed when online memory */ |
960 | static void node_states_check_changes_online(unsigned long nr_pages, | |
961 | struct zone *zone, struct memory_notify *arg) | |
962 | { | |
963 | int nid = zone_to_nid(zone); | |
964 | enum zone_type zone_last = ZONE_NORMAL; | |
965 | ||
966 | /* | |
6715ddf9 LJ |
967 | * If we have HIGHMEM or movable node, node_states[N_NORMAL_MEMORY] |
968 | * contains nodes which have zones of 0...ZONE_NORMAL, | |
969 | * set zone_last to ZONE_NORMAL. | |
d9713679 | 970 | * |
6715ddf9 LJ |
971 | * If we don't have HIGHMEM nor movable node, |
972 | * node_states[N_NORMAL_MEMORY] contains nodes which have zones of | |
973 | * 0...ZONE_MOVABLE, set zone_last to ZONE_MOVABLE. | |
d9713679 | 974 | */ |
6715ddf9 | 975 | if (N_MEMORY == N_NORMAL_MEMORY) |
d9713679 LJ |
976 | zone_last = ZONE_MOVABLE; |
977 | ||
978 | /* | |
979 | * if the memory to be online is in a zone of 0...zone_last, and | |
980 | * the zones of 0...zone_last don't have memory before online, we will | |
981 | * need to set the node to node_states[N_NORMAL_MEMORY] after | |
982 | * the memory is online. | |
983 | */ | |
984 | if (zone_idx(zone) <= zone_last && !node_state(nid, N_NORMAL_MEMORY)) | |
985 | arg->status_change_nid_normal = nid; | |
986 | else | |
987 | arg->status_change_nid_normal = -1; | |
988 | ||
6715ddf9 LJ |
989 | #ifdef CONFIG_HIGHMEM |
990 | /* | |
991 | * If we have movable node, node_states[N_HIGH_MEMORY] | |
992 | * contains nodes which have zones of 0...ZONE_HIGHMEM, | |
993 | * set zone_last to ZONE_HIGHMEM. | |
994 | * | |
995 | * If we don't have movable node, node_states[N_NORMAL_MEMORY] | |
996 | * contains nodes which have zones of 0...ZONE_MOVABLE, | |
997 | * set zone_last to ZONE_MOVABLE. | |
998 | */ | |
999 | zone_last = ZONE_HIGHMEM; | |
1000 | if (N_MEMORY == N_HIGH_MEMORY) | |
1001 | zone_last = ZONE_MOVABLE; | |
1002 | ||
1003 | if (zone_idx(zone) <= zone_last && !node_state(nid, N_HIGH_MEMORY)) | |
1004 | arg->status_change_nid_high = nid; | |
1005 | else | |
1006 | arg->status_change_nid_high = -1; | |
1007 | #else | |
1008 | arg->status_change_nid_high = arg->status_change_nid_normal; | |
1009 | #endif | |
1010 | ||
d9713679 LJ |
1011 | /* |
1012 | * if the node don't have memory befor online, we will need to | |
6715ddf9 | 1013 | * set the node to node_states[N_MEMORY] after the memory |
d9713679 LJ |
1014 | * is online. |
1015 | */ | |
6715ddf9 | 1016 | if (!node_state(nid, N_MEMORY)) |
d9713679 LJ |
1017 | arg->status_change_nid = nid; |
1018 | else | |
1019 | arg->status_change_nid = -1; | |
1020 | } | |
1021 | ||
1022 | static void node_states_set_node(int node, struct memory_notify *arg) | |
1023 | { | |
1024 | if (arg->status_change_nid_normal >= 0) | |
1025 | node_set_state(node, N_NORMAL_MEMORY); | |
1026 | ||
6715ddf9 LJ |
1027 | if (arg->status_change_nid_high >= 0) |
1028 | node_set_state(node, N_HIGH_MEMORY); | |
1029 | ||
1030 | node_set_state(node, N_MEMORY); | |
d9713679 LJ |
1031 | } |
1032 | ||
8a1f780e YI |
1033 | bool zone_can_shift(unsigned long pfn, unsigned long nr_pages, |
1034 | enum zone_type target, int *zone_shift) | |
df429ac0 RA |
1035 | { |
1036 | struct zone *zone = page_zone(pfn_to_page(pfn)); | |
1037 | enum zone_type idx = zone_idx(zone); | |
1038 | int i; | |
1039 | ||
8a1f780e YI |
1040 | *zone_shift = 0; |
1041 | ||
df429ac0 RA |
1042 | if (idx < target) { |
1043 | /* pages must be at end of current zone */ | |
1044 | if (pfn + nr_pages != zone_end_pfn(zone)) | |
8a1f780e | 1045 | return false; |
df429ac0 RA |
1046 | |
1047 | /* no zones in use between current zone and target */ | |
1048 | for (i = idx + 1; i < target; i++) | |
1049 | if (zone_is_initialized(zone - idx + i)) | |
8a1f780e | 1050 | return false; |
df429ac0 RA |
1051 | } |
1052 | ||
1053 | if (target < idx) { | |
1054 | /* pages must be at beginning of current zone */ | |
1055 | if (pfn != zone->zone_start_pfn) | |
8a1f780e | 1056 | return false; |
df429ac0 RA |
1057 | |
1058 | /* no zones in use between current zone and target */ | |
1059 | for (i = target + 1; i < idx; i++) | |
1060 | if (zone_is_initialized(zone - idx + i)) | |
8a1f780e | 1061 | return false; |
df429ac0 RA |
1062 | } |
1063 | ||
8a1f780e YI |
1064 | *zone_shift = target - idx; |
1065 | return true; | |
df429ac0 | 1066 | } |
75884fb1 | 1067 | |
30467e0b | 1068 | /* Must be protected by mem_hotplug_begin() */ |
511c2aba | 1069 | int __ref online_pages(unsigned long pfn, unsigned long nr_pages, int online_type) |
75884fb1 | 1070 | { |
aa47228a | 1071 | unsigned long flags; |
3947be19 DH |
1072 | unsigned long onlined_pages = 0; |
1073 | struct zone *zone; | |
6811378e | 1074 | int need_zonelists_rebuild = 0; |
7b78d335 YG |
1075 | int nid; |
1076 | int ret; | |
1077 | struct memory_notify arg; | |
e51e6c8f | 1078 | int zone_shift = 0; |
7b78d335 | 1079 | |
d9713679 LJ |
1080 | /* |
1081 | * This doesn't need a lock to do pfn_to_page(). | |
1082 | * The section can't be removed here because of the | |
1083 | * memory_block->state_mutex. | |
1084 | */ | |
1085 | zone = page_zone(pfn_to_page(pfn)); | |
1086 | ||
4f7c6b49 TC |
1087 | if ((zone_idx(zone) > ZONE_NORMAL || |
1088 | online_type == MMOP_ONLINE_MOVABLE) && | |
c8f95657 | 1089 | !can_online_high_movable(pfn_to_nid(pfn))) |
30467e0b | 1090 | return -EINVAL; |
74d42d8f | 1091 | |
8a1f780e YI |
1092 | if (online_type == MMOP_ONLINE_KERNEL) { |
1093 | if (!zone_can_shift(pfn, nr_pages, ZONE_NORMAL, &zone_shift)) | |
1094 | return -EINVAL; | |
1095 | } else if (online_type == MMOP_ONLINE_MOVABLE) { | |
1096 | if (!zone_can_shift(pfn, nr_pages, ZONE_MOVABLE, &zone_shift)) | |
1097 | return -EINVAL; | |
1098 | } | |
511c2aba | 1099 | |
e51e6c8f RA |
1100 | zone = move_pfn_range(zone_shift, pfn, pfn + nr_pages); |
1101 | if (!zone) | |
1102 | return -EINVAL; | |
511c2aba | 1103 | |
7b78d335 YG |
1104 | arg.start_pfn = pfn; |
1105 | arg.nr_pages = nr_pages; | |
d9713679 | 1106 | node_states_check_changes_online(nr_pages, zone, &arg); |
7b78d335 | 1107 | |
e888ca35 | 1108 | nid = zone_to_nid(zone); |
3947be19 | 1109 | |
7b78d335 YG |
1110 | ret = memory_notify(MEM_GOING_ONLINE, &arg); |
1111 | ret = notifier_to_errno(ret); | |
e33e33b4 CY |
1112 | if (ret) |
1113 | goto failed_addition; | |
1114 | ||
6811378e YG |
1115 | /* |
1116 | * If this zone is not populated, then it is not in zonelist. | |
1117 | * This means the page allocator ignores this zone. | |
1118 | * So, zonelist must be updated after online. | |
1119 | */ | |
4eaf3f64 | 1120 | mutex_lock(&zonelists_mutex); |
6dcd73d7 | 1121 | if (!populated_zone(zone)) { |
6811378e | 1122 | need_zonelists_rebuild = 1; |
6dcd73d7 WC |
1123 | build_all_zonelists(NULL, zone); |
1124 | } | |
6811378e | 1125 | |
908eedc6 | 1126 | ret = walk_system_ram_range(pfn, nr_pages, &onlined_pages, |
75884fb1 | 1127 | online_pages_range); |
fd8a4221 | 1128 | if (ret) { |
6dcd73d7 WC |
1129 | if (need_zonelists_rebuild) |
1130 | zone_pcp_reset(zone); | |
4eaf3f64 | 1131 | mutex_unlock(&zonelists_mutex); |
e33e33b4 | 1132 | goto failed_addition; |
fd8a4221 GL |
1133 | } |
1134 | ||
3947be19 | 1135 | zone->present_pages += onlined_pages; |
aa47228a CS |
1136 | |
1137 | pgdat_resize_lock(zone->zone_pgdat, &flags); | |
f2937be5 | 1138 | zone->zone_pgdat->node_present_pages += onlined_pages; |
aa47228a CS |
1139 | pgdat_resize_unlock(zone->zone_pgdat, &flags); |
1140 | ||
08dff7b7 | 1141 | if (onlined_pages) { |
e888ca35 | 1142 | node_states_set_node(nid, &arg); |
08dff7b7 | 1143 | if (need_zonelists_rebuild) |
6dcd73d7 | 1144 | build_all_zonelists(NULL, NULL); |
08dff7b7 JL |
1145 | else |
1146 | zone_pcp_update(zone); | |
1147 | } | |
3947be19 | 1148 | |
4eaf3f64 | 1149 | mutex_unlock(&zonelists_mutex); |
1b79acc9 KM |
1150 | |
1151 | init_per_zone_wmark_min(); | |
1152 | ||
698b1b30 | 1153 | if (onlined_pages) { |
e888ca35 | 1154 | kswapd_run(nid); |
698b1b30 VB |
1155 | kcompactd_run(nid); |
1156 | } | |
61b13993 | 1157 | |
1f522509 | 1158 | vm_total_pages = nr_free_pagecache_pages(); |
2f7f24ec | 1159 | |
2d1d43f6 | 1160 | writeback_set_ratelimit(); |
7b78d335 YG |
1161 | |
1162 | if (onlined_pages) | |
1163 | memory_notify(MEM_ONLINE, &arg); | |
30467e0b | 1164 | return 0; |
e33e33b4 CY |
1165 | |
1166 | failed_addition: | |
1167 | pr_debug("online_pages [mem %#010llx-%#010llx] failed\n", | |
1168 | (unsigned long long) pfn << PAGE_SHIFT, | |
1169 | (((unsigned long long) pfn + nr_pages) << PAGE_SHIFT) - 1); | |
1170 | memory_notify(MEM_CANCEL_ONLINE, &arg); | |
1171 | return ret; | |
3947be19 | 1172 | } |
53947027 | 1173 | #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ |
bc02af93 | 1174 | |
0bd85420 TC |
1175 | static void reset_node_present_pages(pg_data_t *pgdat) |
1176 | { | |
1177 | struct zone *z; | |
1178 | ||
1179 | for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++) | |
1180 | z->present_pages = 0; | |
1181 | ||
1182 | pgdat->node_present_pages = 0; | |
1183 | } | |
1184 | ||
e1319331 HS |
1185 | /* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */ |
1186 | static pg_data_t __ref *hotadd_new_pgdat(int nid, u64 start) | |
9af3c2de YG |
1187 | { |
1188 | struct pglist_data *pgdat; | |
1189 | unsigned long zones_size[MAX_NR_ZONES] = {0}; | |
1190 | unsigned long zholes_size[MAX_NR_ZONES] = {0}; | |
c8e861a5 | 1191 | unsigned long start_pfn = PFN_DOWN(start); |
9af3c2de | 1192 | |
a1e565aa TC |
1193 | pgdat = NODE_DATA(nid); |
1194 | if (!pgdat) { | |
1195 | pgdat = arch_alloc_nodedata(nid); | |
1196 | if (!pgdat) | |
1197 | return NULL; | |
9af3c2de | 1198 | |
a1e565aa | 1199 | arch_refresh_nodedata(nid, pgdat); |
b0dc3a34 | 1200 | } else { |
e716f2eb MG |
1201 | /* |
1202 | * Reset the nr_zones, order and classzone_idx before reuse. | |
1203 | * Note that kswapd will init kswapd_classzone_idx properly | |
1204 | * when it starts in the near future. | |
1205 | */ | |
b0dc3a34 | 1206 | pgdat->nr_zones = 0; |
38087d9b MG |
1207 | pgdat->kswapd_order = 0; |
1208 | pgdat->kswapd_classzone_idx = 0; | |
a1e565aa | 1209 | } |
9af3c2de YG |
1210 | |
1211 | /* we can use NODE_DATA(nid) from here */ | |
1212 | ||
1213 | /* init node's zones as empty zones, we don't have any present pages.*/ | |
9109fb7b | 1214 | free_area_init_node(nid, zones_size, start_pfn, zholes_size); |
5830169f | 1215 | pgdat->per_cpu_nodestats = alloc_percpu(struct per_cpu_nodestat); |
9af3c2de | 1216 | |
959ecc48 KH |
1217 | /* |
1218 | * The node we allocated has no zone fallback lists. For avoiding | |
1219 | * to access not-initialized zonelist, build here. | |
1220 | */ | |
f957db4f | 1221 | mutex_lock(&zonelists_mutex); |
9adb62a5 | 1222 | build_all_zonelists(pgdat, NULL); |
f957db4f | 1223 | mutex_unlock(&zonelists_mutex); |
959ecc48 | 1224 | |
f784a3f1 TC |
1225 | /* |
1226 | * zone->managed_pages is set to an approximate value in | |
1227 | * free_area_init_core(), which will cause | |
1228 | * /sys/device/system/node/nodeX/meminfo has wrong data. | |
1229 | * So reset it to 0 before any memory is onlined. | |
1230 | */ | |
1231 | reset_node_managed_pages(pgdat); | |
1232 | ||
0bd85420 TC |
1233 | /* |
1234 | * When memory is hot-added, all the memory is in offline state. So | |
1235 | * clear all zones' present_pages because they will be updated in | |
1236 | * online_pages() and offline_pages(). | |
1237 | */ | |
1238 | reset_node_present_pages(pgdat); | |
1239 | ||
9af3c2de YG |
1240 | return pgdat; |
1241 | } | |
1242 | ||
1243 | static void rollback_node_hotadd(int nid, pg_data_t *pgdat) | |
1244 | { | |
1245 | arch_refresh_nodedata(nid, NULL); | |
5830169f | 1246 | free_percpu(pgdat->per_cpu_nodestats); |
9af3c2de YG |
1247 | arch_free_nodedata(pgdat); |
1248 | return; | |
1249 | } | |
1250 | ||
0a547039 | 1251 | |
01b0f197 TK |
1252 | /** |
1253 | * try_online_node - online a node if offlined | |
1254 | * | |
cf23422b | 1255 | * called by cpu_up() to online a node without onlined memory. |
1256 | */ | |
01b0f197 | 1257 | int try_online_node(int nid) |
cf23422b | 1258 | { |
1259 | pg_data_t *pgdat; | |
1260 | int ret; | |
1261 | ||
01b0f197 TK |
1262 | if (node_online(nid)) |
1263 | return 0; | |
1264 | ||
bfc8c901 | 1265 | mem_hotplug_begin(); |
cf23422b | 1266 | pgdat = hotadd_new_pgdat(nid, 0); |
7553e8f2 | 1267 | if (!pgdat) { |
01b0f197 | 1268 | pr_err("Cannot online node %d due to NULL pgdat\n", nid); |
cf23422b | 1269 | ret = -ENOMEM; |
1270 | goto out; | |
1271 | } | |
1272 | node_set_online(nid); | |
1273 | ret = register_one_node(nid); | |
1274 | BUG_ON(ret); | |
1275 | ||
01b0f197 TK |
1276 | if (pgdat->node_zonelists->_zonerefs->zone == NULL) { |
1277 | mutex_lock(&zonelists_mutex); | |
1278 | build_all_zonelists(NULL, NULL); | |
1279 | mutex_unlock(&zonelists_mutex); | |
1280 | } | |
1281 | ||
cf23422b | 1282 | out: |
bfc8c901 | 1283 | mem_hotplug_done(); |
cf23422b | 1284 | return ret; |
1285 | } | |
1286 | ||
27356f54 TK |
1287 | static int check_hotplug_memory_range(u64 start, u64 size) |
1288 | { | |
c8e861a5 | 1289 | u64 start_pfn = PFN_DOWN(start); |
27356f54 TK |
1290 | u64 nr_pages = size >> PAGE_SHIFT; |
1291 | ||
1292 | /* Memory range must be aligned with section */ | |
1293 | if ((start_pfn & ~PAGE_SECTION_MASK) || | |
1294 | (nr_pages % PAGES_PER_SECTION) || (!nr_pages)) { | |
1295 | pr_err("Section-unaligned hotplug range: start 0x%llx, size 0x%llx\n", | |
1296 | (unsigned long long)start, | |
1297 | (unsigned long long)size); | |
1298 | return -EINVAL; | |
1299 | } | |
1300 | ||
1301 | return 0; | |
1302 | } | |
1303 | ||
63264400 WN |
1304 | /* |
1305 | * If movable zone has already been setup, newly added memory should be check. | |
1306 | * If its address is higher than movable zone, it should be added as movable. | |
1307 | * Without this check, movable zone may overlap with other zone. | |
1308 | */ | |
1309 | static int should_add_memory_movable(int nid, u64 start, u64 size) | |
1310 | { | |
1311 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
1312 | pg_data_t *pgdat = NODE_DATA(nid); | |
1313 | struct zone *movable_zone = pgdat->node_zones + ZONE_MOVABLE; | |
1314 | ||
1315 | if (zone_is_empty(movable_zone)) | |
1316 | return 0; | |
1317 | ||
1318 | if (movable_zone->zone_start_pfn <= start_pfn) | |
1319 | return 1; | |
1320 | ||
1321 | return 0; | |
1322 | } | |
1323 | ||
033fbae9 DW |
1324 | int zone_for_memory(int nid, u64 start, u64 size, int zone_default, |
1325 | bool for_device) | |
63264400 | 1326 | { |
033fbae9 DW |
1327 | #ifdef CONFIG_ZONE_DEVICE |
1328 | if (for_device) | |
1329 | return ZONE_DEVICE; | |
1330 | #endif | |
63264400 WN |
1331 | if (should_add_memory_movable(nid, start, size)) |
1332 | return ZONE_MOVABLE; | |
1333 | ||
1334 | return zone_default; | |
1335 | } | |
1336 | ||
31bc3858 VK |
1337 | static int online_memory_block(struct memory_block *mem, void *arg) |
1338 | { | |
dc18d706 | 1339 | return device_online(&mem->dev); |
31bc3858 VK |
1340 | } |
1341 | ||
31168481 | 1342 | /* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */ |
31bc3858 | 1343 | int __ref add_memory_resource(int nid, struct resource *res, bool online) |
bc02af93 | 1344 | { |
62cedb9f | 1345 | u64 start, size; |
9af3c2de | 1346 | pg_data_t *pgdat = NULL; |
a1e565aa TC |
1347 | bool new_pgdat; |
1348 | bool new_node; | |
bc02af93 YG |
1349 | int ret; |
1350 | ||
62cedb9f DV |
1351 | start = res->start; |
1352 | size = resource_size(res); | |
1353 | ||
27356f54 TK |
1354 | ret = check_hotplug_memory_range(start, size); |
1355 | if (ret) | |
1356 | return ret; | |
1357 | ||
a1e565aa TC |
1358 | { /* Stupid hack to suppress address-never-null warning */ |
1359 | void *p = NODE_DATA(nid); | |
1360 | new_pgdat = !p; | |
1361 | } | |
ac13c462 | 1362 | |
bfc8c901 | 1363 | mem_hotplug_begin(); |
ac13c462 | 1364 | |
7f36e3e5 TC |
1365 | /* |
1366 | * Add new range to memblock so that when hotadd_new_pgdat() is called | |
1367 | * to allocate new pgdat, get_pfn_range_for_nid() will be able to find | |
1368 | * this new range and calculate total pages correctly. The range will | |
1369 | * be removed at hot-remove time. | |
1370 | */ | |
1371 | memblock_add_node(start, size, nid); | |
1372 | ||
a1e565aa TC |
1373 | new_node = !node_online(nid); |
1374 | if (new_node) { | |
9af3c2de | 1375 | pgdat = hotadd_new_pgdat(nid, start); |
6ad696d2 | 1376 | ret = -ENOMEM; |
9af3c2de | 1377 | if (!pgdat) |
41b9e2d7 | 1378 | goto error; |
9af3c2de YG |
1379 | } |
1380 | ||
bc02af93 | 1381 | /* call arch's memory hotadd */ |
033fbae9 | 1382 | ret = arch_add_memory(nid, start, size, false); |
bc02af93 | 1383 | |
9af3c2de YG |
1384 | if (ret < 0) |
1385 | goto error; | |
1386 | ||
0fc44159 | 1387 | /* we online node here. we can't roll back from here. */ |
9af3c2de YG |
1388 | node_set_online(nid); |
1389 | ||
a1e565aa | 1390 | if (new_node) { |
9037a993 MH |
1391 | unsigned long start_pfn = start >> PAGE_SHIFT; |
1392 | unsigned long nr_pages = size >> PAGE_SHIFT; | |
1393 | ||
1394 | ret = __register_one_node(nid); | |
1395 | if (ret) | |
1396 | goto register_fail; | |
1397 | ||
1398 | /* | |
1399 | * link memory sections under this node. This is already | |
1400 | * done when creatig memory section in register_new_memory | |
1401 | * but that depends to have the node registered so offline | |
1402 | * nodes have to go through register_node. | |
1403 | * TODO clean up this mess. | |
1404 | */ | |
1405 | ret = link_mem_sections(nid, start_pfn, nr_pages); | |
1406 | register_fail: | |
0fc44159 YG |
1407 | /* |
1408 | * If sysfs file of new node can't create, cpu on the node | |
1409 | * can't be hot-added. There is no rollback way now. | |
1410 | * So, check by BUG_ON() to catch it reluctantly.. | |
1411 | */ | |
1412 | BUG_ON(ret); | |
1413 | } | |
1414 | ||
d96ae530 AM |
1415 | /* create new memmap entry */ |
1416 | firmware_map_add_hotplug(start, start + size, "System RAM"); | |
1417 | ||
31bc3858 VK |
1418 | /* online pages if requested */ |
1419 | if (online) | |
1420 | walk_memory_range(PFN_DOWN(start), PFN_UP(start + size - 1), | |
1421 | NULL, online_memory_block); | |
1422 | ||
6ad696d2 AK |
1423 | goto out; |
1424 | ||
9af3c2de YG |
1425 | error: |
1426 | /* rollback pgdat allocation and others */ | |
1427 | if (new_pgdat) | |
1428 | rollback_node_hotadd(nid, pgdat); | |
7f36e3e5 | 1429 | memblock_remove(start, size); |
9af3c2de | 1430 | |
6ad696d2 | 1431 | out: |
bfc8c901 | 1432 | mem_hotplug_done(); |
bc02af93 YG |
1433 | return ret; |
1434 | } | |
62cedb9f DV |
1435 | EXPORT_SYMBOL_GPL(add_memory_resource); |
1436 | ||
1437 | int __ref add_memory(int nid, u64 start, u64 size) | |
1438 | { | |
1439 | struct resource *res; | |
1440 | int ret; | |
1441 | ||
1442 | res = register_memory_resource(start, size); | |
6f754ba4 VK |
1443 | if (IS_ERR(res)) |
1444 | return PTR_ERR(res); | |
62cedb9f | 1445 | |
31bc3858 | 1446 | ret = add_memory_resource(nid, res, memhp_auto_online); |
62cedb9f DV |
1447 | if (ret < 0) |
1448 | release_memory_resource(res); | |
1449 | return ret; | |
1450 | } | |
bc02af93 | 1451 | EXPORT_SYMBOL_GPL(add_memory); |
0c0e6195 KH |
1452 | |
1453 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
5c755e9f BP |
1454 | /* |
1455 | * A free page on the buddy free lists (not the per-cpu lists) has PageBuddy | |
1456 | * set and the size of the free page is given by page_order(). Using this, | |
1457 | * the function determines if the pageblock contains only free pages. | |
1458 | * Due to buddy contraints, a free page at least the size of a pageblock will | |
1459 | * be located at the start of the pageblock | |
1460 | */ | |
1461 | static inline int pageblock_free(struct page *page) | |
1462 | { | |
1463 | return PageBuddy(page) && page_order(page) >= pageblock_order; | |
1464 | } | |
1465 | ||
1466 | /* Return the start of the next active pageblock after a given page */ | |
1467 | static struct page *next_active_pageblock(struct page *page) | |
1468 | { | |
5c755e9f BP |
1469 | /* Ensure the starting page is pageblock-aligned */ |
1470 | BUG_ON(page_to_pfn(page) & (pageblock_nr_pages - 1)); | |
1471 | ||
5c755e9f | 1472 | /* If the entire pageblock is free, move to the end of free page */ |
0dcc48c1 KH |
1473 | if (pageblock_free(page)) { |
1474 | int order; | |
1475 | /* be careful. we don't have locks, page_order can be changed.*/ | |
1476 | order = page_order(page); | |
1477 | if ((order < MAX_ORDER) && (order >= pageblock_order)) | |
1478 | return page + (1 << order); | |
1479 | } | |
5c755e9f | 1480 | |
0dcc48c1 | 1481 | return page + pageblock_nr_pages; |
5c755e9f BP |
1482 | } |
1483 | ||
1484 | /* Checks if this range of memory is likely to be hot-removable. */ | |
c98940f6 | 1485 | bool is_mem_section_removable(unsigned long start_pfn, unsigned long nr_pages) |
5c755e9f | 1486 | { |
5c755e9f BP |
1487 | struct page *page = pfn_to_page(start_pfn); |
1488 | struct page *end_page = page + nr_pages; | |
1489 | ||
1490 | /* Check the starting page of each pageblock within the range */ | |
1491 | for (; page < end_page; page = next_active_pageblock(page)) { | |
49ac8255 | 1492 | if (!is_pageblock_removable_nolock(page)) |
c98940f6 | 1493 | return false; |
49ac8255 | 1494 | cond_resched(); |
5c755e9f BP |
1495 | } |
1496 | ||
1497 | /* All pageblocks in the memory block are likely to be hot-removable */ | |
c98940f6 | 1498 | return true; |
5c755e9f BP |
1499 | } |
1500 | ||
0c0e6195 | 1501 | /* |
deb88a2a | 1502 | * Confirm all pages in a range [start, end) belong to the same zone. |
a96dfddb | 1503 | * When true, return its valid [start, end). |
0c0e6195 | 1504 | */ |
a96dfddb TK |
1505 | int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn, |
1506 | unsigned long *valid_start, unsigned long *valid_end) | |
0c0e6195 | 1507 | { |
5f0f2887 | 1508 | unsigned long pfn, sec_end_pfn; |
a96dfddb | 1509 | unsigned long start, end; |
0c0e6195 KH |
1510 | struct zone *zone = NULL; |
1511 | struct page *page; | |
1512 | int i; | |
deb88a2a | 1513 | for (pfn = start_pfn, sec_end_pfn = SECTION_ALIGN_UP(start_pfn + 1); |
0c0e6195 | 1514 | pfn < end_pfn; |
deb88a2a | 1515 | pfn = sec_end_pfn, sec_end_pfn += PAGES_PER_SECTION) { |
5f0f2887 AB |
1516 | /* Make sure the memory section is present first */ |
1517 | if (!present_section_nr(pfn_to_section_nr(pfn))) | |
0c0e6195 | 1518 | continue; |
5f0f2887 AB |
1519 | for (; pfn < sec_end_pfn && pfn < end_pfn; |
1520 | pfn += MAX_ORDER_NR_PAGES) { | |
1521 | i = 0; | |
1522 | /* This is just a CONFIG_HOLES_IN_ZONE check.*/ | |
1523 | while ((i < MAX_ORDER_NR_PAGES) && | |
1524 | !pfn_valid_within(pfn + i)) | |
1525 | i++; | |
d6d8c8a4 | 1526 | if (i == MAX_ORDER_NR_PAGES || pfn + i >= end_pfn) |
5f0f2887 AB |
1527 | continue; |
1528 | page = pfn_to_page(pfn + i); | |
1529 | if (zone && page_zone(page) != zone) | |
1530 | return 0; | |
a96dfddb TK |
1531 | if (!zone) |
1532 | start = pfn + i; | |
5f0f2887 | 1533 | zone = page_zone(page); |
a96dfddb | 1534 | end = pfn + MAX_ORDER_NR_PAGES; |
5f0f2887 | 1535 | } |
0c0e6195 | 1536 | } |
deb88a2a | 1537 | |
a96dfddb TK |
1538 | if (zone) { |
1539 | *valid_start = start; | |
d6d8c8a4 | 1540 | *valid_end = min(end, end_pfn); |
deb88a2a | 1541 | return 1; |
a96dfddb | 1542 | } else { |
deb88a2a | 1543 | return 0; |
a96dfddb | 1544 | } |
0c0e6195 KH |
1545 | } |
1546 | ||
1547 | /* | |
0efadf48 YX |
1548 | * Scan pfn range [start,end) to find movable/migratable pages (LRU pages, |
1549 | * non-lru movable pages and hugepages). We scan pfn because it's much | |
1550 | * easier than scanning over linked list. This function returns the pfn | |
1551 | * of the first found movable page if it's found, otherwise 0. | |
0c0e6195 | 1552 | */ |
c8721bbb | 1553 | static unsigned long scan_movable_pages(unsigned long start, unsigned long end) |
0c0e6195 KH |
1554 | { |
1555 | unsigned long pfn; | |
1556 | struct page *page; | |
1557 | for (pfn = start; pfn < end; pfn++) { | |
1558 | if (pfn_valid(pfn)) { | |
1559 | page = pfn_to_page(pfn); | |
1560 | if (PageLRU(page)) | |
1561 | return pfn; | |
0efadf48 YX |
1562 | if (__PageMovable(page)) |
1563 | return pfn; | |
c8721bbb | 1564 | if (PageHuge(page)) { |
7e1f049e | 1565 | if (page_huge_active(page)) |
c8721bbb NH |
1566 | return pfn; |
1567 | else | |
1568 | pfn = round_up(pfn + 1, | |
1569 | 1 << compound_order(page)) - 1; | |
1570 | } | |
0c0e6195 KH |
1571 | } |
1572 | } | |
1573 | return 0; | |
1574 | } | |
1575 | ||
394e31d2 XQ |
1576 | static struct page *new_node_page(struct page *page, unsigned long private, |
1577 | int **result) | |
1578 | { | |
1579 | gfp_t gfp_mask = GFP_USER | __GFP_MOVABLE; | |
1580 | int nid = page_to_nid(page); | |
231e97e2 LZ |
1581 | nodemask_t nmask = node_states[N_MEMORY]; |
1582 | struct page *new_page = NULL; | |
394e31d2 XQ |
1583 | |
1584 | /* | |
1585 | * TODO: allocate a destination hugepage from a nearest neighbor node, | |
1586 | * accordance with memory policy of the user process if possible. For | |
1587 | * now as a simple work-around, we use the next node for destination. | |
1588 | */ | |
1589 | if (PageHuge(page)) | |
1590 | return alloc_huge_page_node(page_hstate(compound_head(page)), | |
1591 | next_node_in(nid, nmask)); | |
1592 | ||
231e97e2 | 1593 | node_clear(nid, nmask); |
9bb627be | 1594 | |
394e31d2 XQ |
1595 | if (PageHighMem(page) |
1596 | || (zone_idx(page_zone(page)) == ZONE_MOVABLE)) | |
1597 | gfp_mask |= __GFP_HIGHMEM; | |
1598 | ||
231e97e2 LZ |
1599 | if (!nodes_empty(nmask)) |
1600 | new_page = __alloc_pages_nodemask(gfp_mask, 0, | |
394e31d2 XQ |
1601 | node_zonelist(nid, gfp_mask), &nmask); |
1602 | if (!new_page) | |
1603 | new_page = __alloc_pages(gfp_mask, 0, | |
1604 | node_zonelist(nid, gfp_mask)); | |
1605 | ||
1606 | return new_page; | |
1607 | } | |
1608 | ||
0c0e6195 KH |
1609 | #define NR_OFFLINE_AT_ONCE_PAGES (256) |
1610 | static int | |
1611 | do_migrate_range(unsigned long start_pfn, unsigned long end_pfn) | |
1612 | { | |
1613 | unsigned long pfn; | |
1614 | struct page *page; | |
1615 | int move_pages = NR_OFFLINE_AT_ONCE_PAGES; | |
1616 | int not_managed = 0; | |
1617 | int ret = 0; | |
1618 | LIST_HEAD(source); | |
1619 | ||
1620 | for (pfn = start_pfn; pfn < end_pfn && move_pages > 0; pfn++) { | |
1621 | if (!pfn_valid(pfn)) | |
1622 | continue; | |
1623 | page = pfn_to_page(pfn); | |
c8721bbb NH |
1624 | |
1625 | if (PageHuge(page)) { | |
1626 | struct page *head = compound_head(page); | |
1627 | pfn = page_to_pfn(head) + (1<<compound_order(head)) - 1; | |
1628 | if (compound_order(head) > PFN_SECTION_SHIFT) { | |
1629 | ret = -EBUSY; | |
1630 | break; | |
1631 | } | |
1632 | if (isolate_huge_page(page, &source)) | |
1633 | move_pages -= 1 << compound_order(head); | |
1634 | continue; | |
1635 | } | |
1636 | ||
700c2a46 | 1637 | if (!get_page_unless_zero(page)) |
0c0e6195 KH |
1638 | continue; |
1639 | /* | |
0efadf48 YX |
1640 | * We can skip free pages. And we can deal with pages on |
1641 | * LRU and non-lru movable pages. | |
0c0e6195 | 1642 | */ |
0efadf48 YX |
1643 | if (PageLRU(page)) |
1644 | ret = isolate_lru_page(page); | |
1645 | else | |
1646 | ret = isolate_movable_page(page, ISOLATE_UNEVICTABLE); | |
0c0e6195 | 1647 | if (!ret) { /* Success */ |
700c2a46 | 1648 | put_page(page); |
62695a84 | 1649 | list_add_tail(&page->lru, &source); |
0c0e6195 | 1650 | move_pages--; |
0efadf48 YX |
1651 | if (!__PageMovable(page)) |
1652 | inc_node_page_state(page, NR_ISOLATED_ANON + | |
1653 | page_is_file_cache(page)); | |
6d9c285a | 1654 | |
0c0e6195 | 1655 | } else { |
0c0e6195 | 1656 | #ifdef CONFIG_DEBUG_VM |
0efadf48 YX |
1657 | pr_alert("failed to isolate pfn %lx\n", pfn); |
1658 | dump_page(page, "isolation failed"); | |
0c0e6195 | 1659 | #endif |
700c2a46 | 1660 | put_page(page); |
25985edc | 1661 | /* Because we don't have big zone->lock. we should |
809c4449 BL |
1662 | check this again here. */ |
1663 | if (page_count(page)) { | |
1664 | not_managed++; | |
f3ab2636 | 1665 | ret = -EBUSY; |
809c4449 BL |
1666 | break; |
1667 | } | |
0c0e6195 KH |
1668 | } |
1669 | } | |
f3ab2636 BL |
1670 | if (!list_empty(&source)) { |
1671 | if (not_managed) { | |
c8721bbb | 1672 | putback_movable_pages(&source); |
f3ab2636 BL |
1673 | goto out; |
1674 | } | |
74c08f98 | 1675 | |
394e31d2 XQ |
1676 | /* Allocate a new page from the nearest neighbor node */ |
1677 | ret = migrate_pages(&source, new_node_page, NULL, 0, | |
9c620e2b | 1678 | MIGRATE_SYNC, MR_MEMORY_HOTPLUG); |
f3ab2636 | 1679 | if (ret) |
c8721bbb | 1680 | putback_movable_pages(&source); |
0c0e6195 | 1681 | } |
0c0e6195 KH |
1682 | out: |
1683 | return ret; | |
1684 | } | |
1685 | ||
1686 | /* | |
1687 | * remove from free_area[] and mark all as Reserved. | |
1688 | */ | |
1689 | static int | |
1690 | offline_isolated_pages_cb(unsigned long start, unsigned long nr_pages, | |
1691 | void *data) | |
1692 | { | |
1693 | __offline_isolated_pages(start, start + nr_pages); | |
1694 | return 0; | |
1695 | } | |
1696 | ||
1697 | static void | |
1698 | offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn) | |
1699 | { | |
908eedc6 | 1700 | walk_system_ram_range(start_pfn, end_pfn - start_pfn, NULL, |
0c0e6195 KH |
1701 | offline_isolated_pages_cb); |
1702 | } | |
1703 | ||
1704 | /* | |
1705 | * Check all pages in range, recoreded as memory resource, are isolated. | |
1706 | */ | |
1707 | static int | |
1708 | check_pages_isolated_cb(unsigned long start_pfn, unsigned long nr_pages, | |
1709 | void *data) | |
1710 | { | |
1711 | int ret; | |
1712 | long offlined = *(long *)data; | |
b023f468 | 1713 | ret = test_pages_isolated(start_pfn, start_pfn + nr_pages, true); |
0c0e6195 KH |
1714 | offlined = nr_pages; |
1715 | if (!ret) | |
1716 | *(long *)data += offlined; | |
1717 | return ret; | |
1718 | } | |
1719 | ||
1720 | static long | |
1721 | check_pages_isolated(unsigned long start_pfn, unsigned long end_pfn) | |
1722 | { | |
1723 | long offlined = 0; | |
1724 | int ret; | |
1725 | ||
908eedc6 | 1726 | ret = walk_system_ram_range(start_pfn, end_pfn - start_pfn, &offlined, |
0c0e6195 KH |
1727 | check_pages_isolated_cb); |
1728 | if (ret < 0) | |
1729 | offlined = (long)ret; | |
1730 | return offlined; | |
1731 | } | |
1732 | ||
09285af7 | 1733 | #ifdef CONFIG_MOVABLE_NODE |
79a4dcef TC |
1734 | /* |
1735 | * When CONFIG_MOVABLE_NODE, we permit offlining of a node which doesn't have | |
1736 | * normal memory. | |
1737 | */ | |
09285af7 LJ |
1738 | static bool can_offline_normal(struct zone *zone, unsigned long nr_pages) |
1739 | { | |
1740 | return true; | |
1741 | } | |
79a4dcef | 1742 | #else /* CONFIG_MOVABLE_NODE */ |
74d42d8f LJ |
1743 | /* ensure the node has NORMAL memory if it is still online */ |
1744 | static bool can_offline_normal(struct zone *zone, unsigned long nr_pages) | |
1745 | { | |
1746 | struct pglist_data *pgdat = zone->zone_pgdat; | |
1747 | unsigned long present_pages = 0; | |
1748 | enum zone_type zt; | |
1749 | ||
1750 | for (zt = 0; zt <= ZONE_NORMAL; zt++) | |
1751 | present_pages += pgdat->node_zones[zt].present_pages; | |
1752 | ||
1753 | if (present_pages > nr_pages) | |
1754 | return true; | |
1755 | ||
1756 | present_pages = 0; | |
1757 | for (; zt <= ZONE_MOVABLE; zt++) | |
1758 | present_pages += pgdat->node_zones[zt].present_pages; | |
1759 | ||
1760 | /* | |
1761 | * we can't offline the last normal memory until all | |
1762 | * higher memory is offlined. | |
1763 | */ | |
1764 | return present_pages == 0; | |
1765 | } | |
79a4dcef | 1766 | #endif /* CONFIG_MOVABLE_NODE */ |
74d42d8f | 1767 | |
c5320926 TC |
1768 | static int __init cmdline_parse_movable_node(char *p) |
1769 | { | |
1770 | #ifdef CONFIG_MOVABLE_NODE | |
55ac590c | 1771 | movable_node_enabled = true; |
c5320926 TC |
1772 | #else |
1773 | pr_warn("movable_node option not supported\n"); | |
1774 | #endif | |
1775 | return 0; | |
1776 | } | |
1777 | early_param("movable_node", cmdline_parse_movable_node); | |
1778 | ||
d9713679 LJ |
1779 | /* check which state of node_states will be changed when offline memory */ |
1780 | static void node_states_check_changes_offline(unsigned long nr_pages, | |
1781 | struct zone *zone, struct memory_notify *arg) | |
1782 | { | |
1783 | struct pglist_data *pgdat = zone->zone_pgdat; | |
1784 | unsigned long present_pages = 0; | |
1785 | enum zone_type zt, zone_last = ZONE_NORMAL; | |
1786 | ||
1787 | /* | |
6715ddf9 LJ |
1788 | * If we have HIGHMEM or movable node, node_states[N_NORMAL_MEMORY] |
1789 | * contains nodes which have zones of 0...ZONE_NORMAL, | |
1790 | * set zone_last to ZONE_NORMAL. | |
d9713679 | 1791 | * |
6715ddf9 LJ |
1792 | * If we don't have HIGHMEM nor movable node, |
1793 | * node_states[N_NORMAL_MEMORY] contains nodes which have zones of | |
1794 | * 0...ZONE_MOVABLE, set zone_last to ZONE_MOVABLE. | |
d9713679 | 1795 | */ |
6715ddf9 | 1796 | if (N_MEMORY == N_NORMAL_MEMORY) |
d9713679 LJ |
1797 | zone_last = ZONE_MOVABLE; |
1798 | ||
1799 | /* | |
1800 | * check whether node_states[N_NORMAL_MEMORY] will be changed. | |
1801 | * If the memory to be offline is in a zone of 0...zone_last, | |
1802 | * and it is the last present memory, 0...zone_last will | |
1803 | * become empty after offline , thus we can determind we will | |
1804 | * need to clear the node from node_states[N_NORMAL_MEMORY]. | |
1805 | */ | |
1806 | for (zt = 0; zt <= zone_last; zt++) | |
1807 | present_pages += pgdat->node_zones[zt].present_pages; | |
1808 | if (zone_idx(zone) <= zone_last && nr_pages >= present_pages) | |
1809 | arg->status_change_nid_normal = zone_to_nid(zone); | |
1810 | else | |
1811 | arg->status_change_nid_normal = -1; | |
1812 | ||
6715ddf9 LJ |
1813 | #ifdef CONFIG_HIGHMEM |
1814 | /* | |
1815 | * If we have movable node, node_states[N_HIGH_MEMORY] | |
1816 | * contains nodes which have zones of 0...ZONE_HIGHMEM, | |
1817 | * set zone_last to ZONE_HIGHMEM. | |
1818 | * | |
1819 | * If we don't have movable node, node_states[N_NORMAL_MEMORY] | |
1820 | * contains nodes which have zones of 0...ZONE_MOVABLE, | |
1821 | * set zone_last to ZONE_MOVABLE. | |
1822 | */ | |
1823 | zone_last = ZONE_HIGHMEM; | |
1824 | if (N_MEMORY == N_HIGH_MEMORY) | |
1825 | zone_last = ZONE_MOVABLE; | |
1826 | ||
1827 | for (; zt <= zone_last; zt++) | |
1828 | present_pages += pgdat->node_zones[zt].present_pages; | |
1829 | if (zone_idx(zone) <= zone_last && nr_pages >= present_pages) | |
1830 | arg->status_change_nid_high = zone_to_nid(zone); | |
1831 | else | |
1832 | arg->status_change_nid_high = -1; | |
1833 | #else | |
1834 | arg->status_change_nid_high = arg->status_change_nid_normal; | |
1835 | #endif | |
1836 | ||
d9713679 LJ |
1837 | /* |
1838 | * node_states[N_HIGH_MEMORY] contains nodes which have 0...ZONE_MOVABLE | |
1839 | */ | |
1840 | zone_last = ZONE_MOVABLE; | |
1841 | ||
1842 | /* | |
1843 | * check whether node_states[N_HIGH_MEMORY] will be changed | |
1844 | * If we try to offline the last present @nr_pages from the node, | |
1845 | * we can determind we will need to clear the node from | |
1846 | * node_states[N_HIGH_MEMORY]. | |
1847 | */ | |
1848 | for (; zt <= zone_last; zt++) | |
1849 | present_pages += pgdat->node_zones[zt].present_pages; | |
1850 | if (nr_pages >= present_pages) | |
1851 | arg->status_change_nid = zone_to_nid(zone); | |
1852 | else | |
1853 | arg->status_change_nid = -1; | |
1854 | } | |
1855 | ||
1856 | static void node_states_clear_node(int node, struct memory_notify *arg) | |
1857 | { | |
1858 | if (arg->status_change_nid_normal >= 0) | |
1859 | node_clear_state(node, N_NORMAL_MEMORY); | |
1860 | ||
6715ddf9 LJ |
1861 | if ((N_MEMORY != N_NORMAL_MEMORY) && |
1862 | (arg->status_change_nid_high >= 0)) | |
d9713679 | 1863 | node_clear_state(node, N_HIGH_MEMORY); |
6715ddf9 LJ |
1864 | |
1865 | if ((N_MEMORY != N_HIGH_MEMORY) && | |
1866 | (arg->status_change_nid >= 0)) | |
1867 | node_clear_state(node, N_MEMORY); | |
d9713679 LJ |
1868 | } |
1869 | ||
a16cee10 | 1870 | static int __ref __offline_pages(unsigned long start_pfn, |
0c0e6195 KH |
1871 | unsigned long end_pfn, unsigned long timeout) |
1872 | { | |
1873 | unsigned long pfn, nr_pages, expire; | |
1874 | long offlined_pages; | |
7b78d335 | 1875 | int ret, drain, retry_max, node; |
d702909f | 1876 | unsigned long flags; |
a96dfddb | 1877 | unsigned long valid_start, valid_end; |
0c0e6195 | 1878 | struct zone *zone; |
7b78d335 | 1879 | struct memory_notify arg; |
0c0e6195 | 1880 | |
0c0e6195 KH |
1881 | /* at least, alignment against pageblock is necessary */ |
1882 | if (!IS_ALIGNED(start_pfn, pageblock_nr_pages)) | |
1883 | return -EINVAL; | |
1884 | if (!IS_ALIGNED(end_pfn, pageblock_nr_pages)) | |
1885 | return -EINVAL; | |
1886 | /* This makes hotplug much easier...and readable. | |
1887 | we assume this for now. .*/ | |
a96dfddb | 1888 | if (!test_pages_in_a_zone(start_pfn, end_pfn, &valid_start, &valid_end)) |
0c0e6195 | 1889 | return -EINVAL; |
7b78d335 | 1890 | |
a96dfddb | 1891 | zone = page_zone(pfn_to_page(valid_start)); |
7b78d335 YG |
1892 | node = zone_to_nid(zone); |
1893 | nr_pages = end_pfn - start_pfn; | |
1894 | ||
74d42d8f | 1895 | if (zone_idx(zone) <= ZONE_NORMAL && !can_offline_normal(zone, nr_pages)) |
30467e0b | 1896 | return -EINVAL; |
74d42d8f | 1897 | |
0c0e6195 | 1898 | /* set above range as isolated */ |
b023f468 WC |
1899 | ret = start_isolate_page_range(start_pfn, end_pfn, |
1900 | MIGRATE_MOVABLE, true); | |
0c0e6195 | 1901 | if (ret) |
30467e0b | 1902 | return ret; |
7b78d335 YG |
1903 | |
1904 | arg.start_pfn = start_pfn; | |
1905 | arg.nr_pages = nr_pages; | |
d9713679 | 1906 | node_states_check_changes_offline(nr_pages, zone, &arg); |
7b78d335 YG |
1907 | |
1908 | ret = memory_notify(MEM_GOING_OFFLINE, &arg); | |
1909 | ret = notifier_to_errno(ret); | |
1910 | if (ret) | |
1911 | goto failed_removal; | |
1912 | ||
0c0e6195 KH |
1913 | pfn = start_pfn; |
1914 | expire = jiffies + timeout; | |
1915 | drain = 0; | |
1916 | retry_max = 5; | |
1917 | repeat: | |
1918 | /* start memory hot removal */ | |
1919 | ret = -EAGAIN; | |
1920 | if (time_after(jiffies, expire)) | |
1921 | goto failed_removal; | |
1922 | ret = -EINTR; | |
1923 | if (signal_pending(current)) | |
1924 | goto failed_removal; | |
1925 | ret = 0; | |
1926 | if (drain) { | |
1927 | lru_add_drain_all(); | |
0c0e6195 | 1928 | cond_resched(); |
c0554329 | 1929 | drain_all_pages(zone); |
0c0e6195 KH |
1930 | } |
1931 | ||
c8721bbb NH |
1932 | pfn = scan_movable_pages(start_pfn, end_pfn); |
1933 | if (pfn) { /* We have movable pages */ | |
0c0e6195 KH |
1934 | ret = do_migrate_range(pfn, end_pfn); |
1935 | if (!ret) { | |
1936 | drain = 1; | |
1937 | goto repeat; | |
1938 | } else { | |
1939 | if (ret < 0) | |
1940 | if (--retry_max == 0) | |
1941 | goto failed_removal; | |
1942 | yield(); | |
1943 | drain = 1; | |
1944 | goto repeat; | |
1945 | } | |
1946 | } | |
b3834be5 | 1947 | /* drain all zone's lru pagevec, this is asynchronous... */ |
0c0e6195 | 1948 | lru_add_drain_all(); |
0c0e6195 | 1949 | yield(); |
b3834be5 | 1950 | /* drain pcp pages, this is synchronous. */ |
c0554329 | 1951 | drain_all_pages(zone); |
c8721bbb NH |
1952 | /* |
1953 | * dissolve free hugepages in the memory block before doing offlining | |
1954 | * actually in order to make hugetlbfs's object counting consistent. | |
1955 | */ | |
082d5b6b GS |
1956 | ret = dissolve_free_huge_pages(start_pfn, end_pfn); |
1957 | if (ret) | |
1958 | goto failed_removal; | |
0c0e6195 KH |
1959 | /* check again */ |
1960 | offlined_pages = check_pages_isolated(start_pfn, end_pfn); | |
1961 | if (offlined_pages < 0) { | |
1962 | ret = -EBUSY; | |
1963 | goto failed_removal; | |
1964 | } | |
e33e33b4 | 1965 | pr_info("Offlined Pages %ld\n", offlined_pages); |
b3834be5 | 1966 | /* Ok, all of our target is isolated. |
0c0e6195 KH |
1967 | We cannot do rollback at this point. */ |
1968 | offline_isolated_pages(start_pfn, end_pfn); | |
dbc0e4ce | 1969 | /* reset pagetype flags and makes migrate type to be MOVABLE */ |
0815f3d8 | 1970 | undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE); |
0c0e6195 | 1971 | /* removal success */ |
3dcc0571 | 1972 | adjust_managed_page_count(pfn_to_page(start_pfn), -offlined_pages); |
0c0e6195 | 1973 | zone->present_pages -= offlined_pages; |
d702909f CS |
1974 | |
1975 | pgdat_resize_lock(zone->zone_pgdat, &flags); | |
0c0e6195 | 1976 | zone->zone_pgdat->node_present_pages -= offlined_pages; |
d702909f | 1977 | pgdat_resize_unlock(zone->zone_pgdat, &flags); |
7b78d335 | 1978 | |
1b79acc9 KM |
1979 | init_per_zone_wmark_min(); |
1980 | ||
1e8537ba | 1981 | if (!populated_zone(zone)) { |
340175b7 | 1982 | zone_pcp_reset(zone); |
1e8537ba XQ |
1983 | mutex_lock(&zonelists_mutex); |
1984 | build_all_zonelists(NULL, NULL); | |
1985 | mutex_unlock(&zonelists_mutex); | |
1986 | } else | |
1987 | zone_pcp_update(zone); | |
340175b7 | 1988 | |
d9713679 | 1989 | node_states_clear_node(node, &arg); |
698b1b30 | 1990 | if (arg.status_change_nid >= 0) { |
8fe23e05 | 1991 | kswapd_stop(node); |
698b1b30 VB |
1992 | kcompactd_stop(node); |
1993 | } | |
bce7394a | 1994 | |
0c0e6195 KH |
1995 | vm_total_pages = nr_free_pagecache_pages(); |
1996 | writeback_set_ratelimit(); | |
7b78d335 YG |
1997 | |
1998 | memory_notify(MEM_OFFLINE, &arg); | |
0c0e6195 KH |
1999 | return 0; |
2000 | ||
2001 | failed_removal: | |
e33e33b4 CY |
2002 | pr_debug("memory offlining [mem %#010llx-%#010llx] failed\n", |
2003 | (unsigned long long) start_pfn << PAGE_SHIFT, | |
2004 | ((unsigned long long) end_pfn << PAGE_SHIFT) - 1); | |
7b78d335 | 2005 | memory_notify(MEM_CANCEL_OFFLINE, &arg); |
0c0e6195 | 2006 | /* pushback to free area */ |
0815f3d8 | 2007 | undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE); |
0c0e6195 KH |
2008 | return ret; |
2009 | } | |
71088785 | 2010 | |
30467e0b | 2011 | /* Must be protected by mem_hotplug_begin() */ |
a16cee10 WC |
2012 | int offline_pages(unsigned long start_pfn, unsigned long nr_pages) |
2013 | { | |
2014 | return __offline_pages(start_pfn, start_pfn + nr_pages, 120 * HZ); | |
2015 | } | |
e2ff3940 | 2016 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
a16cee10 | 2017 | |
bbc76be6 WC |
2018 | /** |
2019 | * walk_memory_range - walks through all mem sections in [start_pfn, end_pfn) | |
2020 | * @start_pfn: start pfn of the memory range | |
e05c4bbf | 2021 | * @end_pfn: end pfn of the memory range |
bbc76be6 WC |
2022 | * @arg: argument passed to func |
2023 | * @func: callback for each memory section walked | |
2024 | * | |
2025 | * This function walks through all present mem sections in range | |
2026 | * [start_pfn, end_pfn) and call func on each mem section. | |
2027 | * | |
2028 | * Returns the return value of func. | |
2029 | */ | |
e2ff3940 | 2030 | int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn, |
bbc76be6 | 2031 | void *arg, int (*func)(struct memory_block *, void *)) |
71088785 | 2032 | { |
e90bdb7f WC |
2033 | struct memory_block *mem = NULL; |
2034 | struct mem_section *section; | |
e90bdb7f WC |
2035 | unsigned long pfn, section_nr; |
2036 | int ret; | |
e90bdb7f WC |
2037 | |
2038 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { | |
2039 | section_nr = pfn_to_section_nr(pfn); | |
2040 | if (!present_section_nr(section_nr)) | |
2041 | continue; | |
2042 | ||
2043 | section = __nr_to_section(section_nr); | |
2044 | /* same memblock? */ | |
2045 | if (mem) | |
2046 | if ((section_nr >= mem->start_section_nr) && | |
2047 | (section_nr <= mem->end_section_nr)) | |
2048 | continue; | |
2049 | ||
2050 | mem = find_memory_block_hinted(section, mem); | |
2051 | if (!mem) | |
2052 | continue; | |
2053 | ||
bbc76be6 | 2054 | ret = func(mem, arg); |
e90bdb7f | 2055 | if (ret) { |
bbc76be6 WC |
2056 | kobject_put(&mem->dev.kobj); |
2057 | return ret; | |
e90bdb7f WC |
2058 | } |
2059 | } | |
2060 | ||
2061 | if (mem) | |
2062 | kobject_put(&mem->dev.kobj); | |
2063 | ||
bbc76be6 WC |
2064 | return 0; |
2065 | } | |
2066 | ||
e2ff3940 | 2067 | #ifdef CONFIG_MEMORY_HOTREMOVE |
d6de9d53 | 2068 | static int check_memblock_offlined_cb(struct memory_block *mem, void *arg) |
bbc76be6 WC |
2069 | { |
2070 | int ret = !is_memblock_offlined(mem); | |
2071 | ||
349daa0f RD |
2072 | if (unlikely(ret)) { |
2073 | phys_addr_t beginpa, endpa; | |
2074 | ||
2075 | beginpa = PFN_PHYS(section_nr_to_pfn(mem->start_section_nr)); | |
2076 | endpa = PFN_PHYS(section_nr_to_pfn(mem->end_section_nr + 1))-1; | |
756a025f | 2077 | pr_warn("removing memory fails, because memory [%pa-%pa] is onlined\n", |
349daa0f RD |
2078 | &beginpa, &endpa); |
2079 | } | |
bbc76be6 WC |
2080 | |
2081 | return ret; | |
2082 | } | |
2083 | ||
0f1cfe9d | 2084 | static int check_cpu_on_node(pg_data_t *pgdat) |
60a5a19e | 2085 | { |
60a5a19e TC |
2086 | int cpu; |
2087 | ||
2088 | for_each_present_cpu(cpu) { | |
2089 | if (cpu_to_node(cpu) == pgdat->node_id) | |
2090 | /* | |
2091 | * the cpu on this node isn't removed, and we can't | |
2092 | * offline this node. | |
2093 | */ | |
2094 | return -EBUSY; | |
2095 | } | |
2096 | ||
2097 | return 0; | |
2098 | } | |
2099 | ||
0f1cfe9d | 2100 | static void unmap_cpu_on_node(pg_data_t *pgdat) |
e13fe869 WC |
2101 | { |
2102 | #ifdef CONFIG_ACPI_NUMA | |
e13fe869 WC |
2103 | int cpu; |
2104 | ||
2105 | for_each_possible_cpu(cpu) | |
2106 | if (cpu_to_node(cpu) == pgdat->node_id) | |
2107 | numa_clear_node(cpu); | |
2108 | #endif | |
2109 | } | |
2110 | ||
0f1cfe9d | 2111 | static int check_and_unmap_cpu_on_node(pg_data_t *pgdat) |
e13fe869 | 2112 | { |
0f1cfe9d | 2113 | int ret; |
e13fe869 | 2114 | |
0f1cfe9d | 2115 | ret = check_cpu_on_node(pgdat); |
e13fe869 WC |
2116 | if (ret) |
2117 | return ret; | |
2118 | ||
2119 | /* | |
2120 | * the node will be offlined when we come here, so we can clear | |
2121 | * the cpu_to_node() now. | |
2122 | */ | |
2123 | ||
0f1cfe9d | 2124 | unmap_cpu_on_node(pgdat); |
e13fe869 WC |
2125 | return 0; |
2126 | } | |
2127 | ||
0f1cfe9d TK |
2128 | /** |
2129 | * try_offline_node | |
2130 | * | |
2131 | * Offline a node if all memory sections and cpus of the node are removed. | |
2132 | * | |
2133 | * NOTE: The caller must call lock_device_hotplug() to serialize hotplug | |
2134 | * and online/offline operations before this call. | |
2135 | */ | |
90b30cdc | 2136 | void try_offline_node(int nid) |
60a5a19e | 2137 | { |
d822b86a WC |
2138 | pg_data_t *pgdat = NODE_DATA(nid); |
2139 | unsigned long start_pfn = pgdat->node_start_pfn; | |
2140 | unsigned long end_pfn = start_pfn + pgdat->node_spanned_pages; | |
60a5a19e TC |
2141 | unsigned long pfn; |
2142 | ||
2143 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { | |
2144 | unsigned long section_nr = pfn_to_section_nr(pfn); | |
2145 | ||
2146 | if (!present_section_nr(section_nr)) | |
2147 | continue; | |
2148 | ||
2149 | if (pfn_to_nid(pfn) != nid) | |
2150 | continue; | |
2151 | ||
2152 | /* | |
2153 | * some memory sections of this node are not removed, and we | |
2154 | * can't offline node now. | |
2155 | */ | |
2156 | return; | |
2157 | } | |
2158 | ||
0f1cfe9d | 2159 | if (check_and_unmap_cpu_on_node(pgdat)) |
60a5a19e TC |
2160 | return; |
2161 | ||
2162 | /* | |
2163 | * all memory/cpu of this node are removed, we can offline this | |
2164 | * node now. | |
2165 | */ | |
2166 | node_set_offline(nid); | |
2167 | unregister_one_node(nid); | |
2168 | } | |
90b30cdc | 2169 | EXPORT_SYMBOL(try_offline_node); |
60a5a19e | 2170 | |
0f1cfe9d TK |
2171 | /** |
2172 | * remove_memory | |
2173 | * | |
2174 | * NOTE: The caller must call lock_device_hotplug() to serialize hotplug | |
2175 | * and online/offline operations before this call, as required by | |
2176 | * try_offline_node(). | |
2177 | */ | |
242831eb | 2178 | void __ref remove_memory(int nid, u64 start, u64 size) |
bbc76be6 | 2179 | { |
242831eb | 2180 | int ret; |
993c1aad | 2181 | |
27356f54 TK |
2182 | BUG_ON(check_hotplug_memory_range(start, size)); |
2183 | ||
bfc8c901 | 2184 | mem_hotplug_begin(); |
6677e3ea YI |
2185 | |
2186 | /* | |
242831eb RW |
2187 | * All memory blocks must be offlined before removing memory. Check |
2188 | * whether all memory blocks in question are offline and trigger a BUG() | |
2189 | * if this is not the case. | |
6677e3ea | 2190 | */ |
242831eb | 2191 | ret = walk_memory_range(PFN_DOWN(start), PFN_UP(start + size - 1), NULL, |
d6de9d53 | 2192 | check_memblock_offlined_cb); |
bfc8c901 | 2193 | if (ret) |
242831eb | 2194 | BUG(); |
6677e3ea | 2195 | |
46c66c4b YI |
2196 | /* remove memmap entry */ |
2197 | firmware_map_remove(start, start + size, "System RAM"); | |
f9126ab9 XQ |
2198 | memblock_free(start, size); |
2199 | memblock_remove(start, size); | |
46c66c4b | 2200 | |
24d335ca WC |
2201 | arch_remove_memory(start, size); |
2202 | ||
60a5a19e TC |
2203 | try_offline_node(nid); |
2204 | ||
bfc8c901 | 2205 | mem_hotplug_done(); |
71088785 | 2206 | } |
71088785 | 2207 | EXPORT_SYMBOL_GPL(remove_memory); |
aba6efc4 | 2208 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |