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> | |
9 | #include <linux/swap.h> | |
10 | #include <linux/interrupt.h> | |
11 | #include <linux/pagemap.h> | |
3947be19 | 12 | #include <linux/compiler.h> |
b95f1b31 | 13 | #include <linux/export.h> |
3947be19 | 14 | #include <linux/pagevec.h> |
2d1d43f6 | 15 | #include <linux/writeback.h> |
3947be19 DH |
16 | #include <linux/slab.h> |
17 | #include <linux/sysctl.h> | |
18 | #include <linux/cpu.h> | |
19 | #include <linux/memory.h> | |
4b94ffdc | 20 | #include <linux/memremap.h> |
3947be19 DH |
21 | #include <linux/memory_hotplug.h> |
22 | #include <linux/highmem.h> | |
23 | #include <linux/vmalloc.h> | |
0a547039 | 24 | #include <linux/ioport.h> |
0c0e6195 KH |
25 | #include <linux/delay.h> |
26 | #include <linux/migrate.h> | |
27 | #include <linux/page-isolation.h> | |
71088785 | 28 | #include <linux/pfn.h> |
6ad696d2 | 29 | #include <linux/suspend.h> |
6d9c285a | 30 | #include <linux/mm_inline.h> |
d96ae530 | 31 | #include <linux/firmware-map.h> |
60a5a19e | 32 | #include <linux/stop_machine.h> |
c8721bbb | 33 | #include <linux/hugetlb.h> |
c5320926 | 34 | #include <linux/memblock.h> |
f784a3f1 | 35 | #include <linux/bootmem.h> |
3947be19 DH |
36 | |
37 | #include <asm/tlbflush.h> | |
38 | ||
1e5ad9a3 AB |
39 | #include "internal.h" |
40 | ||
9d0ad8ca DK |
41 | /* |
42 | * online_page_callback contains pointer to current page onlining function. | |
43 | * Initially it is generic_online_page(). If it is required it could be | |
44 | * changed by calling set_online_page_callback() for callback registration | |
45 | * and restore_online_page_callback() for generic callback restore. | |
46 | */ | |
47 | ||
48 | static void generic_online_page(struct page *page); | |
49 | ||
50 | static online_page_callback_t online_page_callback = generic_online_page; | |
bfc8c901 | 51 | static DEFINE_MUTEX(online_page_callback_lock); |
9d0ad8ca | 52 | |
bfc8c901 VD |
53 | /* The same as the cpu_hotplug lock, but for memory hotplug. */ |
54 | static struct { | |
55 | struct task_struct *active_writer; | |
56 | struct mutex lock; /* Synchronizes accesses to refcount, */ | |
57 | /* | |
58 | * Also blocks the new readers during | |
59 | * an ongoing mem hotplug operation. | |
60 | */ | |
61 | int refcount; | |
62 | ||
63 | #ifdef CONFIG_DEBUG_LOCK_ALLOC | |
64 | struct lockdep_map dep_map; | |
65 | #endif | |
66 | } mem_hotplug = { | |
67 | .active_writer = NULL, | |
68 | .lock = __MUTEX_INITIALIZER(mem_hotplug.lock), | |
69 | .refcount = 0, | |
70 | #ifdef CONFIG_DEBUG_LOCK_ALLOC | |
71 | .dep_map = {.name = "mem_hotplug.lock" }, | |
72 | #endif | |
73 | }; | |
74 | ||
75 | /* Lockdep annotations for get/put_online_mems() and mem_hotplug_begin/end() */ | |
76 | #define memhp_lock_acquire_read() lock_map_acquire_read(&mem_hotplug.dep_map) | |
77 | #define memhp_lock_acquire() lock_map_acquire(&mem_hotplug.dep_map) | |
78 | #define memhp_lock_release() lock_map_release(&mem_hotplug.dep_map) | |
79 | ||
80 | void get_online_mems(void) | |
81 | { | |
82 | might_sleep(); | |
83 | if (mem_hotplug.active_writer == current) | |
84 | return; | |
85 | memhp_lock_acquire_read(); | |
86 | mutex_lock(&mem_hotplug.lock); | |
87 | mem_hotplug.refcount++; | |
88 | mutex_unlock(&mem_hotplug.lock); | |
89 | ||
90 | } | |
20d6c96b | 91 | |
bfc8c901 | 92 | void put_online_mems(void) |
20d6c96b | 93 | { |
bfc8c901 VD |
94 | if (mem_hotplug.active_writer == current) |
95 | return; | |
96 | mutex_lock(&mem_hotplug.lock); | |
97 | ||
98 | if (WARN_ON(!mem_hotplug.refcount)) | |
99 | mem_hotplug.refcount++; /* try to fix things up */ | |
100 | ||
101 | if (!--mem_hotplug.refcount && unlikely(mem_hotplug.active_writer)) | |
102 | wake_up_process(mem_hotplug.active_writer); | |
103 | mutex_unlock(&mem_hotplug.lock); | |
104 | memhp_lock_release(); | |
105 | ||
20d6c96b KM |
106 | } |
107 | ||
30467e0b | 108 | void mem_hotplug_begin(void) |
20d6c96b | 109 | { |
bfc8c901 VD |
110 | mem_hotplug.active_writer = current; |
111 | ||
112 | memhp_lock_acquire(); | |
113 | for (;;) { | |
114 | mutex_lock(&mem_hotplug.lock); | |
115 | if (likely(!mem_hotplug.refcount)) | |
116 | break; | |
117 | __set_current_state(TASK_UNINTERRUPTIBLE); | |
118 | mutex_unlock(&mem_hotplug.lock); | |
119 | schedule(); | |
120 | } | |
20d6c96b KM |
121 | } |
122 | ||
30467e0b | 123 | void mem_hotplug_done(void) |
bfc8c901 VD |
124 | { |
125 | mem_hotplug.active_writer = NULL; | |
126 | mutex_unlock(&mem_hotplug.lock); | |
127 | memhp_lock_release(); | |
128 | } | |
20d6c96b | 129 | |
45e0b78b KM |
130 | /* add this memory to iomem resource */ |
131 | static struct resource *register_memory_resource(u64 start, u64 size) | |
132 | { | |
133 | struct resource *res; | |
134 | res = kzalloc(sizeof(struct resource), GFP_KERNEL); | |
6f754ba4 VK |
135 | if (!res) |
136 | return ERR_PTR(-ENOMEM); | |
45e0b78b KM |
137 | |
138 | res->name = "System RAM"; | |
139 | res->start = start; | |
140 | res->end = start + size - 1; | |
887c3cb1 | 141 | res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; |
45e0b78b | 142 | if (request_resource(&iomem_resource, res) < 0) { |
4996eed8 | 143 | pr_debug("System RAM resource %pR cannot be added\n", res); |
45e0b78b | 144 | kfree(res); |
6f754ba4 | 145 | return ERR_PTR(-EEXIST); |
45e0b78b KM |
146 | } |
147 | return res; | |
148 | } | |
149 | ||
150 | static void release_memory_resource(struct resource *res) | |
151 | { | |
152 | if (!res) | |
153 | return; | |
154 | release_resource(res); | |
155 | kfree(res); | |
156 | return; | |
157 | } | |
158 | ||
53947027 | 159 | #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE |
46723bfa YI |
160 | void get_page_bootmem(unsigned long info, struct page *page, |
161 | unsigned long type) | |
04753278 | 162 | { |
5f24ce5f | 163 | page->lru.next = (struct list_head *) type; |
04753278 YG |
164 | SetPagePrivate(page); |
165 | set_page_private(page, info); | |
166 | atomic_inc(&page->_count); | |
167 | } | |
168 | ||
170a5a7e | 169 | void put_page_bootmem(struct page *page) |
04753278 | 170 | { |
5f24ce5f | 171 | unsigned long type; |
04753278 | 172 | |
5f24ce5f AA |
173 | type = (unsigned long) page->lru.next; |
174 | BUG_ON(type < MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE || | |
175 | type > MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE); | |
04753278 YG |
176 | |
177 | if (atomic_dec_return(&page->_count) == 1) { | |
178 | ClearPagePrivate(page); | |
179 | set_page_private(page, 0); | |
5f24ce5f | 180 | INIT_LIST_HEAD(&page->lru); |
170a5a7e | 181 | free_reserved_page(page); |
04753278 | 182 | } |
04753278 YG |
183 | } |
184 | ||
46723bfa YI |
185 | #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE |
186 | #ifndef CONFIG_SPARSEMEM_VMEMMAP | |
d92bc318 | 187 | static void register_page_bootmem_info_section(unsigned long start_pfn) |
04753278 YG |
188 | { |
189 | unsigned long *usemap, mapsize, section_nr, i; | |
190 | struct mem_section *ms; | |
191 | struct page *page, *memmap; | |
192 | ||
04753278 YG |
193 | section_nr = pfn_to_section_nr(start_pfn); |
194 | ms = __nr_to_section(section_nr); | |
195 | ||
196 | /* Get section's memmap address */ | |
197 | memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); | |
198 | ||
199 | /* | |
200 | * Get page for the memmap's phys address | |
201 | * XXX: need more consideration for sparse_vmemmap... | |
202 | */ | |
203 | page = virt_to_page(memmap); | |
204 | mapsize = sizeof(struct page) * PAGES_PER_SECTION; | |
205 | mapsize = PAGE_ALIGN(mapsize) >> PAGE_SHIFT; | |
206 | ||
207 | /* remember memmap's page */ | |
208 | for (i = 0; i < mapsize; i++, page++) | |
209 | get_page_bootmem(section_nr, page, SECTION_INFO); | |
210 | ||
211 | usemap = __nr_to_section(section_nr)->pageblock_flags; | |
212 | page = virt_to_page(usemap); | |
213 | ||
214 | mapsize = PAGE_ALIGN(usemap_size()) >> PAGE_SHIFT; | |
215 | ||
216 | for (i = 0; i < mapsize; i++, page++) | |
af370fb8 | 217 | get_page_bootmem(section_nr, page, MIX_SECTION_INFO); |
04753278 YG |
218 | |
219 | } | |
46723bfa YI |
220 | #else /* CONFIG_SPARSEMEM_VMEMMAP */ |
221 | static void register_page_bootmem_info_section(unsigned long start_pfn) | |
222 | { | |
223 | unsigned long *usemap, mapsize, section_nr, i; | |
224 | struct mem_section *ms; | |
225 | struct page *page, *memmap; | |
226 | ||
227 | if (!pfn_valid(start_pfn)) | |
228 | return; | |
229 | ||
230 | section_nr = pfn_to_section_nr(start_pfn); | |
231 | ms = __nr_to_section(section_nr); | |
232 | ||
233 | memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); | |
234 | ||
235 | register_page_bootmem_memmap(section_nr, memmap, PAGES_PER_SECTION); | |
236 | ||
237 | usemap = __nr_to_section(section_nr)->pageblock_flags; | |
238 | page = virt_to_page(usemap); | |
239 | ||
240 | mapsize = PAGE_ALIGN(usemap_size()) >> PAGE_SHIFT; | |
241 | ||
242 | for (i = 0; i < mapsize; i++, page++) | |
243 | get_page_bootmem(section_nr, page, MIX_SECTION_INFO); | |
244 | } | |
245 | #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ | |
04753278 YG |
246 | |
247 | void register_page_bootmem_info_node(struct pglist_data *pgdat) | |
248 | { | |
249 | unsigned long i, pfn, end_pfn, nr_pages; | |
250 | int node = pgdat->node_id; | |
251 | struct page *page; | |
252 | struct zone *zone; | |
253 | ||
254 | nr_pages = PAGE_ALIGN(sizeof(struct pglist_data)) >> PAGE_SHIFT; | |
255 | page = virt_to_page(pgdat); | |
256 | ||
257 | for (i = 0; i < nr_pages; i++, page++) | |
258 | get_page_bootmem(node, page, NODE_INFO); | |
259 | ||
260 | zone = &pgdat->node_zones[0]; | |
261 | for (; zone < pgdat->node_zones + MAX_NR_ZONES - 1; zone++) { | |
139c2d75 | 262 | if (zone_is_initialized(zone)) { |
04753278 YG |
263 | nr_pages = zone->wait_table_hash_nr_entries |
264 | * sizeof(wait_queue_head_t); | |
265 | nr_pages = PAGE_ALIGN(nr_pages) >> PAGE_SHIFT; | |
266 | page = virt_to_page(zone->wait_table); | |
267 | ||
268 | for (i = 0; i < nr_pages; i++, page++) | |
269 | get_page_bootmem(node, page, NODE_INFO); | |
270 | } | |
271 | } | |
272 | ||
273 | pfn = pgdat->node_start_pfn; | |
c1f19495 | 274 | end_pfn = pgdat_end_pfn(pgdat); |
04753278 | 275 | |
7e9f5eb0 | 276 | /* register section info */ |
f14851af | 277 | for (; pfn < end_pfn; pfn += PAGES_PER_SECTION) { |
278 | /* | |
279 | * Some platforms can assign the same pfn to multiple nodes - on | |
280 | * node0 as well as nodeN. To avoid registering a pfn against | |
281 | * multiple nodes we check that this pfn does not already | |
7e9f5eb0 | 282 | * reside in some other nodes. |
f14851af | 283 | */ |
284 | if (pfn_valid(pfn) && (pfn_to_nid(pfn) == node)) | |
285 | register_page_bootmem_info_section(pfn); | |
286 | } | |
04753278 | 287 | } |
46723bfa | 288 | #endif /* CONFIG_HAVE_BOOTMEM_INFO_NODE */ |
04753278 | 289 | |
f2765404 FF |
290 | static void __meminit grow_zone_span(struct zone *zone, unsigned long start_pfn, |
291 | unsigned long end_pfn) | |
76cdd58e HC |
292 | { |
293 | unsigned long old_zone_end_pfn; | |
294 | ||
295 | zone_span_writelock(zone); | |
296 | ||
c33bc315 | 297 | old_zone_end_pfn = zone_end_pfn(zone); |
8080fc03 | 298 | if (zone_is_empty(zone) || start_pfn < zone->zone_start_pfn) |
76cdd58e HC |
299 | zone->zone_start_pfn = start_pfn; |
300 | ||
301 | zone->spanned_pages = max(old_zone_end_pfn, end_pfn) - | |
302 | zone->zone_start_pfn; | |
303 | ||
304 | zone_span_writeunlock(zone); | |
305 | } | |
306 | ||
511c2aba LJ |
307 | static void resize_zone(struct zone *zone, unsigned long start_pfn, |
308 | unsigned long end_pfn) | |
309 | { | |
310 | zone_span_writelock(zone); | |
311 | ||
e455a9b9 LJ |
312 | if (end_pfn - start_pfn) { |
313 | zone->zone_start_pfn = start_pfn; | |
314 | zone->spanned_pages = end_pfn - start_pfn; | |
315 | } else { | |
316 | /* | |
317 | * make it consist as free_area_init_core(), | |
318 | * if spanned_pages = 0, then keep start_pfn = 0 | |
319 | */ | |
320 | zone->zone_start_pfn = 0; | |
321 | zone->spanned_pages = 0; | |
322 | } | |
511c2aba LJ |
323 | |
324 | zone_span_writeunlock(zone); | |
325 | } | |
326 | ||
327 | static void fix_zone_id(struct zone *zone, unsigned long start_pfn, | |
328 | unsigned long end_pfn) | |
329 | { | |
330 | enum zone_type zid = zone_idx(zone); | |
331 | int nid = zone->zone_pgdat->node_id; | |
332 | unsigned long pfn; | |
333 | ||
334 | for (pfn = start_pfn; pfn < end_pfn; pfn++) | |
335 | set_page_links(pfn_to_page(pfn), zid, nid, pfn); | |
336 | } | |
337 | ||
f6bbb78e | 338 | /* Can fail with -ENOMEM from allocating a wait table with vmalloc() or |
9e43aa2b | 339 | * alloc_bootmem_node_nopanic()/memblock_virt_alloc_node_nopanic() */ |
f6bbb78e CS |
340 | static int __ref ensure_zone_is_initialized(struct zone *zone, |
341 | unsigned long start_pfn, unsigned long num_pages) | |
342 | { | |
343 | if (!zone_is_initialized(zone)) | |
b171e409 YB |
344 | return init_currently_empty_zone(zone, start_pfn, num_pages); |
345 | ||
f6bbb78e CS |
346 | return 0; |
347 | } | |
348 | ||
e455a9b9 | 349 | static int __meminit move_pfn_range_left(struct zone *z1, struct zone *z2, |
511c2aba LJ |
350 | unsigned long start_pfn, unsigned long end_pfn) |
351 | { | |
e455a9b9 | 352 | int ret; |
511c2aba | 353 | unsigned long flags; |
e455a9b9 LJ |
354 | unsigned long z1_start_pfn; |
355 | ||
64dd1b29 CS |
356 | ret = ensure_zone_is_initialized(z1, start_pfn, end_pfn - start_pfn); |
357 | if (ret) | |
358 | return ret; | |
511c2aba LJ |
359 | |
360 | pgdat_resize_lock(z1->zone_pgdat, &flags); | |
361 | ||
362 | /* can't move pfns which are higher than @z2 */ | |
108bcc96 | 363 | if (end_pfn > zone_end_pfn(z2)) |
511c2aba | 364 | goto out_fail; |
834405c3 | 365 | /* the move out part must be at the left most of @z2 */ |
511c2aba LJ |
366 | if (start_pfn > z2->zone_start_pfn) |
367 | goto out_fail; | |
368 | /* must included/overlap */ | |
369 | if (end_pfn <= z2->zone_start_pfn) | |
370 | goto out_fail; | |
371 | ||
e455a9b9 | 372 | /* use start_pfn for z1's start_pfn if z1 is empty */ |
8080fc03 | 373 | if (!zone_is_empty(z1)) |
e455a9b9 LJ |
374 | z1_start_pfn = z1->zone_start_pfn; |
375 | else | |
376 | z1_start_pfn = start_pfn; | |
377 | ||
378 | resize_zone(z1, z1_start_pfn, end_pfn); | |
108bcc96 | 379 | resize_zone(z2, end_pfn, zone_end_pfn(z2)); |
511c2aba LJ |
380 | |
381 | pgdat_resize_unlock(z1->zone_pgdat, &flags); | |
382 | ||
383 | fix_zone_id(z1, start_pfn, end_pfn); | |
384 | ||
385 | return 0; | |
386 | out_fail: | |
387 | pgdat_resize_unlock(z1->zone_pgdat, &flags); | |
388 | return -1; | |
389 | } | |
390 | ||
e455a9b9 | 391 | static int __meminit move_pfn_range_right(struct zone *z1, struct zone *z2, |
511c2aba LJ |
392 | unsigned long start_pfn, unsigned long end_pfn) |
393 | { | |
e455a9b9 | 394 | int ret; |
511c2aba | 395 | unsigned long flags; |
e455a9b9 LJ |
396 | unsigned long z2_end_pfn; |
397 | ||
64dd1b29 CS |
398 | ret = ensure_zone_is_initialized(z2, start_pfn, end_pfn - start_pfn); |
399 | if (ret) | |
400 | return ret; | |
511c2aba LJ |
401 | |
402 | pgdat_resize_lock(z1->zone_pgdat, &flags); | |
403 | ||
404 | /* can't move pfns which are lower than @z1 */ | |
405 | if (z1->zone_start_pfn > start_pfn) | |
406 | goto out_fail; | |
407 | /* the move out part mast at the right most of @z1 */ | |
108bcc96 | 408 | if (zone_end_pfn(z1) > end_pfn) |
511c2aba LJ |
409 | goto out_fail; |
410 | /* must included/overlap */ | |
108bcc96 | 411 | if (start_pfn >= zone_end_pfn(z1)) |
511c2aba LJ |
412 | goto out_fail; |
413 | ||
e455a9b9 | 414 | /* use end_pfn for z2's end_pfn if z2 is empty */ |
8080fc03 | 415 | if (!zone_is_empty(z2)) |
108bcc96 | 416 | z2_end_pfn = zone_end_pfn(z2); |
e455a9b9 LJ |
417 | else |
418 | z2_end_pfn = end_pfn; | |
419 | ||
511c2aba | 420 | resize_zone(z1, z1->zone_start_pfn, start_pfn); |
e455a9b9 | 421 | resize_zone(z2, start_pfn, z2_end_pfn); |
511c2aba LJ |
422 | |
423 | pgdat_resize_unlock(z1->zone_pgdat, &flags); | |
424 | ||
425 | fix_zone_id(z2, start_pfn, end_pfn); | |
426 | ||
427 | return 0; | |
428 | out_fail: | |
429 | pgdat_resize_unlock(z1->zone_pgdat, &flags); | |
430 | return -1; | |
431 | } | |
432 | ||
f2765404 FF |
433 | static void __meminit grow_pgdat_span(struct pglist_data *pgdat, unsigned long start_pfn, |
434 | unsigned long end_pfn) | |
76cdd58e | 435 | { |
83285c72 | 436 | unsigned long old_pgdat_end_pfn = pgdat_end_pfn(pgdat); |
76cdd58e | 437 | |
712cd386 | 438 | if (!pgdat->node_spanned_pages || start_pfn < pgdat->node_start_pfn) |
76cdd58e HC |
439 | pgdat->node_start_pfn = start_pfn; |
440 | ||
441 | pgdat->node_spanned_pages = max(old_pgdat_end_pfn, end_pfn) - | |
442 | pgdat->node_start_pfn; | |
443 | } | |
444 | ||
31168481 | 445 | static int __meminit __add_zone(struct zone *zone, unsigned long phys_start_pfn) |
3947be19 DH |
446 | { |
447 | struct pglist_data *pgdat = zone->zone_pgdat; | |
448 | int nr_pages = PAGES_PER_SECTION; | |
449 | int nid = pgdat->node_id; | |
450 | int zone_type; | |
e298ff75 | 451 | unsigned long flags, pfn; |
64dd1b29 | 452 | int ret; |
3947be19 DH |
453 | |
454 | zone_type = zone - pgdat->node_zones; | |
64dd1b29 CS |
455 | ret = ensure_zone_is_initialized(zone, phys_start_pfn, nr_pages); |
456 | if (ret) | |
457 | return ret; | |
76cdd58e | 458 | |
76cdd58e HC |
459 | pgdat_resize_lock(zone->zone_pgdat, &flags); |
460 | grow_zone_span(zone, phys_start_pfn, phys_start_pfn + nr_pages); | |
461 | grow_pgdat_span(zone->zone_pgdat, phys_start_pfn, | |
462 | phys_start_pfn + nr_pages); | |
463 | pgdat_resize_unlock(zone->zone_pgdat, &flags); | |
a2f3aa02 DH |
464 | memmap_init_zone(nr_pages, nid, zone_type, |
465 | phys_start_pfn, MEMMAP_HOTPLUG); | |
e298ff75 MG |
466 | |
467 | /* online_page_range is called later and expects pages reserved */ | |
468 | for (pfn = phys_start_pfn; pfn < phys_start_pfn + nr_pages; pfn++) { | |
469 | if (!pfn_valid(pfn)) | |
470 | continue; | |
471 | ||
472 | SetPageReserved(pfn_to_page(pfn)); | |
473 | } | |
718127cc | 474 | return 0; |
3947be19 DH |
475 | } |
476 | ||
c04fc586 GH |
477 | static int __meminit __add_section(int nid, struct zone *zone, |
478 | unsigned long phys_start_pfn) | |
3947be19 | 479 | { |
3947be19 DH |
480 | int ret; |
481 | ||
ebd15302 KH |
482 | if (pfn_valid(phys_start_pfn)) |
483 | return -EEXIST; | |
484 | ||
85b35fea | 485 | ret = sparse_add_one_section(zone, phys_start_pfn); |
3947be19 DH |
486 | |
487 | if (ret < 0) | |
488 | return ret; | |
489 | ||
718127cc YG |
490 | ret = __add_zone(zone, phys_start_pfn); |
491 | ||
492 | if (ret < 0) | |
493 | return ret; | |
494 | ||
c04fc586 | 495 | return register_new_memory(nid, __pfn_to_section(phys_start_pfn)); |
3947be19 DH |
496 | } |
497 | ||
4edd7cef DR |
498 | /* |
499 | * Reasonably generic function for adding memory. It is | |
500 | * expected that archs that support memory hotplug will | |
501 | * call this function after deciding the zone to which to | |
502 | * add the new pages. | |
503 | */ | |
504 | int __ref __add_pages(int nid, struct zone *zone, unsigned long phys_start_pfn, | |
505 | unsigned long nr_pages) | |
506 | { | |
507 | unsigned long i; | |
508 | int err = 0; | |
509 | int start_sec, end_sec; | |
4b94ffdc DW |
510 | struct vmem_altmap *altmap; |
511 | ||
4edd7cef DR |
512 | /* during initialize mem_map, align hot-added range to section */ |
513 | start_sec = pfn_to_section_nr(phys_start_pfn); | |
514 | end_sec = pfn_to_section_nr(phys_start_pfn + nr_pages - 1); | |
515 | ||
4b94ffdc DW |
516 | altmap = to_vmem_altmap((unsigned long) pfn_to_page(phys_start_pfn)); |
517 | if (altmap) { | |
518 | /* | |
519 | * Validate altmap is within bounds of the total request | |
520 | */ | |
521 | if (altmap->base_pfn != phys_start_pfn | |
522 | || vmem_altmap_offset(altmap) > nr_pages) { | |
523 | pr_warn_once("memory add fail, invalid altmap\n"); | |
524 | return -EINVAL; | |
525 | } | |
526 | altmap->alloc = 0; | |
527 | } | |
528 | ||
4edd7cef | 529 | for (i = start_sec; i <= end_sec; i++) { |
19c07d5e | 530 | err = __add_section(nid, zone, section_nr_to_pfn(i)); |
4edd7cef DR |
531 | |
532 | /* | |
533 | * EEXIST is finally dealt with by ioresource collision | |
534 | * check. see add_memory() => register_memory_resource() | |
535 | * Warning will be printed if there is collision. | |
536 | */ | |
537 | if (err && (err != -EEXIST)) | |
538 | break; | |
539 | err = 0; | |
540 | } | |
c435a390 | 541 | vmemmap_populate_print_last(); |
4edd7cef DR |
542 | |
543 | return err; | |
544 | } | |
545 | EXPORT_SYMBOL_GPL(__add_pages); | |
546 | ||
547 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
815121d2 YI |
548 | /* find the smallest valid pfn in the range [start_pfn, end_pfn) */ |
549 | static int find_smallest_section_pfn(int nid, struct zone *zone, | |
550 | unsigned long start_pfn, | |
551 | unsigned long end_pfn) | |
552 | { | |
553 | struct mem_section *ms; | |
554 | ||
555 | for (; start_pfn < end_pfn; start_pfn += PAGES_PER_SECTION) { | |
556 | ms = __pfn_to_section(start_pfn); | |
557 | ||
558 | if (unlikely(!valid_section(ms))) | |
559 | continue; | |
560 | ||
561 | if (unlikely(pfn_to_nid(start_pfn) != nid)) | |
562 | continue; | |
563 | ||
564 | if (zone && zone != page_zone(pfn_to_page(start_pfn))) | |
565 | continue; | |
566 | ||
567 | return start_pfn; | |
568 | } | |
569 | ||
570 | return 0; | |
571 | } | |
572 | ||
573 | /* find the biggest valid pfn in the range [start_pfn, end_pfn). */ | |
574 | static int find_biggest_section_pfn(int nid, struct zone *zone, | |
575 | unsigned long start_pfn, | |
576 | unsigned long end_pfn) | |
577 | { | |
578 | struct mem_section *ms; | |
579 | unsigned long pfn; | |
580 | ||
581 | /* pfn is the end pfn of a memory section. */ | |
582 | pfn = end_pfn - 1; | |
583 | for (; pfn >= start_pfn; pfn -= PAGES_PER_SECTION) { | |
584 | ms = __pfn_to_section(pfn); | |
585 | ||
586 | if (unlikely(!valid_section(ms))) | |
587 | continue; | |
588 | ||
589 | if (unlikely(pfn_to_nid(pfn) != nid)) | |
590 | continue; | |
591 | ||
592 | if (zone && zone != page_zone(pfn_to_page(pfn))) | |
593 | continue; | |
594 | ||
595 | return pfn; | |
596 | } | |
597 | ||
598 | return 0; | |
599 | } | |
600 | ||
601 | static void shrink_zone_span(struct zone *zone, unsigned long start_pfn, | |
602 | unsigned long end_pfn) | |
603 | { | |
c33bc315 XQ |
604 | unsigned long zone_start_pfn = zone->zone_start_pfn; |
605 | unsigned long z = zone_end_pfn(zone); /* zone_end_pfn namespace clash */ | |
606 | unsigned long zone_end_pfn = z; | |
815121d2 YI |
607 | unsigned long pfn; |
608 | struct mem_section *ms; | |
609 | int nid = zone_to_nid(zone); | |
610 | ||
611 | zone_span_writelock(zone); | |
612 | if (zone_start_pfn == start_pfn) { | |
613 | /* | |
614 | * If the section is smallest section in the zone, it need | |
615 | * shrink zone->zone_start_pfn and zone->zone_spanned_pages. | |
616 | * In this case, we find second smallest valid mem_section | |
617 | * for shrinking zone. | |
618 | */ | |
619 | pfn = find_smallest_section_pfn(nid, zone, end_pfn, | |
620 | zone_end_pfn); | |
621 | if (pfn) { | |
622 | zone->zone_start_pfn = pfn; | |
623 | zone->spanned_pages = zone_end_pfn - pfn; | |
624 | } | |
625 | } else if (zone_end_pfn == end_pfn) { | |
626 | /* | |
627 | * If the section is biggest section in the zone, it need | |
628 | * shrink zone->spanned_pages. | |
629 | * In this case, we find second biggest valid mem_section for | |
630 | * shrinking zone. | |
631 | */ | |
632 | pfn = find_biggest_section_pfn(nid, zone, zone_start_pfn, | |
633 | start_pfn); | |
634 | if (pfn) | |
635 | zone->spanned_pages = pfn - zone_start_pfn + 1; | |
636 | } | |
637 | ||
638 | /* | |
639 | * The section is not biggest or smallest mem_section in the zone, it | |
640 | * only creates a hole in the zone. So in this case, we need not | |
641 | * change the zone. But perhaps, the zone has only hole data. Thus | |
642 | * it check the zone has only hole or not. | |
643 | */ | |
644 | pfn = zone_start_pfn; | |
645 | for (; pfn < zone_end_pfn; pfn += PAGES_PER_SECTION) { | |
646 | ms = __pfn_to_section(pfn); | |
647 | ||
648 | if (unlikely(!valid_section(ms))) | |
649 | continue; | |
650 | ||
651 | if (page_zone(pfn_to_page(pfn)) != zone) | |
652 | continue; | |
653 | ||
654 | /* If the section is current section, it continues the loop */ | |
655 | if (start_pfn == pfn) | |
656 | continue; | |
657 | ||
658 | /* If we find valid section, we have nothing to do */ | |
659 | zone_span_writeunlock(zone); | |
660 | return; | |
661 | } | |
662 | ||
663 | /* The zone has no valid section */ | |
664 | zone->zone_start_pfn = 0; | |
665 | zone->spanned_pages = 0; | |
666 | zone_span_writeunlock(zone); | |
667 | } | |
668 | ||
669 | static void shrink_pgdat_span(struct pglist_data *pgdat, | |
670 | unsigned long start_pfn, unsigned long end_pfn) | |
671 | { | |
83285c72 XQ |
672 | unsigned long pgdat_start_pfn = pgdat->node_start_pfn; |
673 | unsigned long p = pgdat_end_pfn(pgdat); /* pgdat_end_pfn namespace clash */ | |
674 | unsigned long pgdat_end_pfn = p; | |
815121d2 YI |
675 | unsigned long pfn; |
676 | struct mem_section *ms; | |
677 | int nid = pgdat->node_id; | |
678 | ||
679 | if (pgdat_start_pfn == start_pfn) { | |
680 | /* | |
681 | * If the section is smallest section in the pgdat, it need | |
682 | * shrink pgdat->node_start_pfn and pgdat->node_spanned_pages. | |
683 | * In this case, we find second smallest valid mem_section | |
684 | * for shrinking zone. | |
685 | */ | |
686 | pfn = find_smallest_section_pfn(nid, NULL, end_pfn, | |
687 | pgdat_end_pfn); | |
688 | if (pfn) { | |
689 | pgdat->node_start_pfn = pfn; | |
690 | pgdat->node_spanned_pages = pgdat_end_pfn - pfn; | |
691 | } | |
692 | } else if (pgdat_end_pfn == end_pfn) { | |
693 | /* | |
694 | * If the section is biggest section in the pgdat, it need | |
695 | * shrink pgdat->node_spanned_pages. | |
696 | * In this case, we find second biggest valid mem_section for | |
697 | * shrinking zone. | |
698 | */ | |
699 | pfn = find_biggest_section_pfn(nid, NULL, pgdat_start_pfn, | |
700 | start_pfn); | |
701 | if (pfn) | |
702 | pgdat->node_spanned_pages = pfn - pgdat_start_pfn + 1; | |
703 | } | |
704 | ||
705 | /* | |
706 | * If the section is not biggest or smallest mem_section in the pgdat, | |
707 | * it only creates a hole in the pgdat. So in this case, we need not | |
708 | * change the pgdat. | |
709 | * But perhaps, the pgdat has only hole data. Thus it check the pgdat | |
710 | * has only hole or not. | |
711 | */ | |
712 | pfn = pgdat_start_pfn; | |
713 | for (; pfn < pgdat_end_pfn; pfn += PAGES_PER_SECTION) { | |
714 | ms = __pfn_to_section(pfn); | |
715 | ||
716 | if (unlikely(!valid_section(ms))) | |
717 | continue; | |
718 | ||
719 | if (pfn_to_nid(pfn) != nid) | |
720 | continue; | |
721 | ||
722 | /* If the section is current section, it continues the loop */ | |
723 | if (start_pfn == pfn) | |
724 | continue; | |
725 | ||
726 | /* If we find valid section, we have nothing to do */ | |
727 | return; | |
728 | } | |
729 | ||
730 | /* The pgdat has no valid section */ | |
731 | pgdat->node_start_pfn = 0; | |
732 | pgdat->node_spanned_pages = 0; | |
733 | } | |
734 | ||
735 | static void __remove_zone(struct zone *zone, unsigned long start_pfn) | |
736 | { | |
737 | struct pglist_data *pgdat = zone->zone_pgdat; | |
738 | int nr_pages = PAGES_PER_SECTION; | |
739 | int zone_type; | |
740 | unsigned long flags; | |
741 | ||
742 | zone_type = zone - pgdat->node_zones; | |
743 | ||
744 | pgdat_resize_lock(zone->zone_pgdat, &flags); | |
745 | shrink_zone_span(zone, start_pfn, start_pfn + nr_pages); | |
746 | shrink_pgdat_span(pgdat, start_pfn, start_pfn + nr_pages); | |
747 | pgdat_resize_unlock(zone->zone_pgdat, &flags); | |
748 | } | |
749 | ||
4b94ffdc DW |
750 | static int __remove_section(struct zone *zone, struct mem_section *ms, |
751 | unsigned long map_offset) | |
ea01ea93 | 752 | { |
815121d2 YI |
753 | unsigned long start_pfn; |
754 | int scn_nr; | |
ea01ea93 BP |
755 | int ret = -EINVAL; |
756 | ||
757 | if (!valid_section(ms)) | |
758 | return ret; | |
759 | ||
760 | ret = unregister_memory_section(ms); | |
761 | if (ret) | |
762 | return ret; | |
763 | ||
815121d2 YI |
764 | scn_nr = __section_nr(ms); |
765 | start_pfn = section_nr_to_pfn(scn_nr); | |
766 | __remove_zone(zone, start_pfn); | |
767 | ||
4b94ffdc | 768 | sparse_remove_one_section(zone, ms, map_offset); |
ea01ea93 BP |
769 | return 0; |
770 | } | |
771 | ||
ea01ea93 BP |
772 | /** |
773 | * __remove_pages() - remove sections of pages from a zone | |
774 | * @zone: zone from which pages need to be removed | |
775 | * @phys_start_pfn: starting pageframe (must be aligned to start of a section) | |
776 | * @nr_pages: number of pages to remove (must be multiple of section size) | |
777 | * | |
778 | * Generic helper function to remove section mappings and sysfs entries | |
779 | * for the section of the memory we are removing. Caller needs to make | |
780 | * sure that pages are marked reserved and zones are adjust properly by | |
781 | * calling offline_pages(). | |
782 | */ | |
783 | int __remove_pages(struct zone *zone, unsigned long phys_start_pfn, | |
784 | unsigned long nr_pages) | |
785 | { | |
fe74ebb1 | 786 | unsigned long i; |
4b94ffdc DW |
787 | unsigned long map_offset = 0; |
788 | int sections_to_remove, ret = 0; | |
789 | ||
790 | /* In the ZONE_DEVICE case device driver owns the memory region */ | |
791 | if (is_dev_zone(zone)) { | |
792 | struct page *page = pfn_to_page(phys_start_pfn); | |
793 | struct vmem_altmap *altmap; | |
794 | ||
795 | altmap = to_vmem_altmap((unsigned long) page); | |
796 | if (altmap) | |
797 | map_offset = vmem_altmap_offset(altmap); | |
798 | } else { | |
799 | resource_size_t start, size; | |
800 | ||
801 | start = phys_start_pfn << PAGE_SHIFT; | |
802 | size = nr_pages * PAGE_SIZE; | |
803 | ||
804 | ret = release_mem_region_adjustable(&iomem_resource, start, | |
805 | size); | |
806 | if (ret) { | |
807 | resource_size_t endres = start + size - 1; | |
808 | ||
809 | pr_warn("Unable to release resource <%pa-%pa> (%d)\n", | |
810 | &start, &endres, ret); | |
811 | } | |
812 | } | |
ea01ea93 BP |
813 | |
814 | /* | |
815 | * We can only remove entire sections | |
816 | */ | |
817 | BUG_ON(phys_start_pfn & ~PAGE_SECTION_MASK); | |
818 | BUG_ON(nr_pages % PAGES_PER_SECTION); | |
819 | ||
ea01ea93 BP |
820 | sections_to_remove = nr_pages / PAGES_PER_SECTION; |
821 | for (i = 0; i < sections_to_remove; i++) { | |
822 | unsigned long pfn = phys_start_pfn + i*PAGES_PER_SECTION; | |
4b94ffdc DW |
823 | |
824 | ret = __remove_section(zone, __pfn_to_section(pfn), map_offset); | |
825 | map_offset = 0; | |
ea01ea93 BP |
826 | if (ret) |
827 | break; | |
828 | } | |
829 | return ret; | |
830 | } | |
831 | EXPORT_SYMBOL_GPL(__remove_pages); | |
4edd7cef | 832 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
ea01ea93 | 833 | |
9d0ad8ca DK |
834 | int set_online_page_callback(online_page_callback_t callback) |
835 | { | |
836 | int rc = -EINVAL; | |
837 | ||
bfc8c901 VD |
838 | get_online_mems(); |
839 | mutex_lock(&online_page_callback_lock); | |
9d0ad8ca DK |
840 | |
841 | if (online_page_callback == generic_online_page) { | |
842 | online_page_callback = callback; | |
843 | rc = 0; | |
844 | } | |
845 | ||
bfc8c901 VD |
846 | mutex_unlock(&online_page_callback_lock); |
847 | put_online_mems(); | |
9d0ad8ca DK |
848 | |
849 | return rc; | |
850 | } | |
851 | EXPORT_SYMBOL_GPL(set_online_page_callback); | |
852 | ||
853 | int restore_online_page_callback(online_page_callback_t callback) | |
854 | { | |
855 | int rc = -EINVAL; | |
856 | ||
bfc8c901 VD |
857 | get_online_mems(); |
858 | mutex_lock(&online_page_callback_lock); | |
9d0ad8ca DK |
859 | |
860 | if (online_page_callback == callback) { | |
861 | online_page_callback = generic_online_page; | |
862 | rc = 0; | |
863 | } | |
864 | ||
bfc8c901 VD |
865 | mutex_unlock(&online_page_callback_lock); |
866 | put_online_mems(); | |
9d0ad8ca DK |
867 | |
868 | return rc; | |
869 | } | |
870 | EXPORT_SYMBOL_GPL(restore_online_page_callback); | |
871 | ||
872 | void __online_page_set_limits(struct page *page) | |
180c06ef | 873 | { |
9d0ad8ca DK |
874 | } |
875 | EXPORT_SYMBOL_GPL(__online_page_set_limits); | |
876 | ||
877 | void __online_page_increment_counters(struct page *page) | |
878 | { | |
3dcc0571 | 879 | adjust_managed_page_count(page, 1); |
9d0ad8ca DK |
880 | } |
881 | EXPORT_SYMBOL_GPL(__online_page_increment_counters); | |
180c06ef | 882 | |
9d0ad8ca DK |
883 | void __online_page_free(struct page *page) |
884 | { | |
3dcc0571 | 885 | __free_reserved_page(page); |
180c06ef | 886 | } |
9d0ad8ca DK |
887 | EXPORT_SYMBOL_GPL(__online_page_free); |
888 | ||
889 | static void generic_online_page(struct page *page) | |
890 | { | |
891 | __online_page_set_limits(page); | |
892 | __online_page_increment_counters(page); | |
893 | __online_page_free(page); | |
894 | } | |
180c06ef | 895 | |
75884fb1 KH |
896 | static int online_pages_range(unsigned long start_pfn, unsigned long nr_pages, |
897 | void *arg) | |
3947be19 DH |
898 | { |
899 | unsigned long i; | |
75884fb1 KH |
900 | unsigned long onlined_pages = *(unsigned long *)arg; |
901 | struct page *page; | |
902 | if (PageReserved(pfn_to_page(start_pfn))) | |
903 | for (i = 0; i < nr_pages; i++) { | |
904 | page = pfn_to_page(start_pfn + i); | |
9d0ad8ca | 905 | (*online_page_callback)(page); |
75884fb1 KH |
906 | onlined_pages++; |
907 | } | |
908 | *(unsigned long *)arg = onlined_pages; | |
909 | return 0; | |
910 | } | |
911 | ||
09285af7 | 912 | #ifdef CONFIG_MOVABLE_NODE |
79a4dcef TC |
913 | /* |
914 | * When CONFIG_MOVABLE_NODE, we permit onlining of a node which doesn't have | |
915 | * normal memory. | |
916 | */ | |
09285af7 LJ |
917 | static bool can_online_high_movable(struct zone *zone) |
918 | { | |
919 | return true; | |
920 | } | |
79a4dcef | 921 | #else /* CONFIG_MOVABLE_NODE */ |
74d42d8f LJ |
922 | /* ensure every online node has NORMAL memory */ |
923 | static bool can_online_high_movable(struct zone *zone) | |
924 | { | |
925 | return node_state(zone_to_nid(zone), N_NORMAL_MEMORY); | |
926 | } | |
79a4dcef | 927 | #endif /* CONFIG_MOVABLE_NODE */ |
74d42d8f | 928 | |
d9713679 LJ |
929 | /* check which state of node_states will be changed when online memory */ |
930 | static void node_states_check_changes_online(unsigned long nr_pages, | |
931 | struct zone *zone, struct memory_notify *arg) | |
932 | { | |
933 | int nid = zone_to_nid(zone); | |
934 | enum zone_type zone_last = ZONE_NORMAL; | |
935 | ||
936 | /* | |
6715ddf9 LJ |
937 | * If we have HIGHMEM or movable node, node_states[N_NORMAL_MEMORY] |
938 | * contains nodes which have zones of 0...ZONE_NORMAL, | |
939 | * set zone_last to ZONE_NORMAL. | |
d9713679 | 940 | * |
6715ddf9 LJ |
941 | * If we don't have HIGHMEM nor movable node, |
942 | * node_states[N_NORMAL_MEMORY] contains nodes which have zones of | |
943 | * 0...ZONE_MOVABLE, set zone_last to ZONE_MOVABLE. | |
d9713679 | 944 | */ |
6715ddf9 | 945 | if (N_MEMORY == N_NORMAL_MEMORY) |
d9713679 LJ |
946 | zone_last = ZONE_MOVABLE; |
947 | ||
948 | /* | |
949 | * if the memory to be online is in a zone of 0...zone_last, and | |
950 | * the zones of 0...zone_last don't have memory before online, we will | |
951 | * need to set the node to node_states[N_NORMAL_MEMORY] after | |
952 | * the memory is online. | |
953 | */ | |
954 | if (zone_idx(zone) <= zone_last && !node_state(nid, N_NORMAL_MEMORY)) | |
955 | arg->status_change_nid_normal = nid; | |
956 | else | |
957 | arg->status_change_nid_normal = -1; | |
958 | ||
6715ddf9 LJ |
959 | #ifdef CONFIG_HIGHMEM |
960 | /* | |
961 | * If we have movable node, node_states[N_HIGH_MEMORY] | |
962 | * contains nodes which have zones of 0...ZONE_HIGHMEM, | |
963 | * set zone_last to ZONE_HIGHMEM. | |
964 | * | |
965 | * If we don't have movable node, node_states[N_NORMAL_MEMORY] | |
966 | * contains nodes which have zones of 0...ZONE_MOVABLE, | |
967 | * set zone_last to ZONE_MOVABLE. | |
968 | */ | |
969 | zone_last = ZONE_HIGHMEM; | |
970 | if (N_MEMORY == N_HIGH_MEMORY) | |
971 | zone_last = ZONE_MOVABLE; | |
972 | ||
973 | if (zone_idx(zone) <= zone_last && !node_state(nid, N_HIGH_MEMORY)) | |
974 | arg->status_change_nid_high = nid; | |
975 | else | |
976 | arg->status_change_nid_high = -1; | |
977 | #else | |
978 | arg->status_change_nid_high = arg->status_change_nid_normal; | |
979 | #endif | |
980 | ||
d9713679 LJ |
981 | /* |
982 | * if the node don't have memory befor online, we will need to | |
6715ddf9 | 983 | * set the node to node_states[N_MEMORY] after the memory |
d9713679 LJ |
984 | * is online. |
985 | */ | |
6715ddf9 | 986 | if (!node_state(nid, N_MEMORY)) |
d9713679 LJ |
987 | arg->status_change_nid = nid; |
988 | else | |
989 | arg->status_change_nid = -1; | |
990 | } | |
991 | ||
992 | static void node_states_set_node(int node, struct memory_notify *arg) | |
993 | { | |
994 | if (arg->status_change_nid_normal >= 0) | |
995 | node_set_state(node, N_NORMAL_MEMORY); | |
996 | ||
6715ddf9 LJ |
997 | if (arg->status_change_nid_high >= 0) |
998 | node_set_state(node, N_HIGH_MEMORY); | |
999 | ||
1000 | node_set_state(node, N_MEMORY); | |
d9713679 LJ |
1001 | } |
1002 | ||
75884fb1 | 1003 | |
30467e0b | 1004 | /* Must be protected by mem_hotplug_begin() */ |
511c2aba | 1005 | int __ref online_pages(unsigned long pfn, unsigned long nr_pages, int online_type) |
75884fb1 | 1006 | { |
aa47228a | 1007 | unsigned long flags; |
3947be19 DH |
1008 | unsigned long onlined_pages = 0; |
1009 | struct zone *zone; | |
6811378e | 1010 | int need_zonelists_rebuild = 0; |
7b78d335 YG |
1011 | int nid; |
1012 | int ret; | |
1013 | struct memory_notify arg; | |
1014 | ||
d9713679 LJ |
1015 | /* |
1016 | * This doesn't need a lock to do pfn_to_page(). | |
1017 | * The section can't be removed here because of the | |
1018 | * memory_block->state_mutex. | |
1019 | */ | |
1020 | zone = page_zone(pfn_to_page(pfn)); | |
1021 | ||
4f7c6b49 TC |
1022 | if ((zone_idx(zone) > ZONE_NORMAL || |
1023 | online_type == MMOP_ONLINE_MOVABLE) && | |
bfc8c901 | 1024 | !can_online_high_movable(zone)) |
30467e0b | 1025 | return -EINVAL; |
74d42d8f | 1026 | |
4f7c6b49 TC |
1027 | if (online_type == MMOP_ONLINE_KERNEL && |
1028 | zone_idx(zone) == ZONE_MOVABLE) { | |
bfc8c901 | 1029 | if (move_pfn_range_left(zone - 1, zone, pfn, pfn + nr_pages)) |
30467e0b | 1030 | return -EINVAL; |
511c2aba | 1031 | } |
4f7c6b49 TC |
1032 | if (online_type == MMOP_ONLINE_MOVABLE && |
1033 | zone_idx(zone) == ZONE_MOVABLE - 1) { | |
bfc8c901 | 1034 | if (move_pfn_range_right(zone, zone + 1, pfn, pfn + nr_pages)) |
30467e0b | 1035 | return -EINVAL; |
511c2aba LJ |
1036 | } |
1037 | ||
1038 | /* Previous code may changed the zone of the pfn range */ | |
1039 | zone = page_zone(pfn_to_page(pfn)); | |
1040 | ||
7b78d335 YG |
1041 | arg.start_pfn = pfn; |
1042 | arg.nr_pages = nr_pages; | |
d9713679 | 1043 | node_states_check_changes_online(nr_pages, zone, &arg); |
7b78d335 | 1044 | |
9c2606b7 | 1045 | nid = pfn_to_nid(pfn); |
3947be19 | 1046 | |
7b78d335 YG |
1047 | ret = memory_notify(MEM_GOING_ONLINE, &arg); |
1048 | ret = notifier_to_errno(ret); | |
1049 | if (ret) { | |
1050 | memory_notify(MEM_CANCEL_ONLINE, &arg); | |
30467e0b | 1051 | return ret; |
7b78d335 | 1052 | } |
6811378e YG |
1053 | /* |
1054 | * If this zone is not populated, then it is not in zonelist. | |
1055 | * This means the page allocator ignores this zone. | |
1056 | * So, zonelist must be updated after online. | |
1057 | */ | |
4eaf3f64 | 1058 | mutex_lock(&zonelists_mutex); |
6dcd73d7 | 1059 | if (!populated_zone(zone)) { |
6811378e | 1060 | need_zonelists_rebuild = 1; |
6dcd73d7 WC |
1061 | build_all_zonelists(NULL, zone); |
1062 | } | |
6811378e | 1063 | |
908eedc6 | 1064 | ret = walk_system_ram_range(pfn, nr_pages, &onlined_pages, |
75884fb1 | 1065 | online_pages_range); |
fd8a4221 | 1066 | if (ret) { |
6dcd73d7 WC |
1067 | if (need_zonelists_rebuild) |
1068 | zone_pcp_reset(zone); | |
4eaf3f64 | 1069 | mutex_unlock(&zonelists_mutex); |
a62e2f4f BH |
1070 | printk(KERN_DEBUG "online_pages [mem %#010llx-%#010llx] failed\n", |
1071 | (unsigned long long) pfn << PAGE_SHIFT, | |
1072 | (((unsigned long long) pfn + nr_pages) | |
1073 | << PAGE_SHIFT) - 1); | |
fd8a4221 | 1074 | memory_notify(MEM_CANCEL_ONLINE, &arg); |
30467e0b | 1075 | return ret; |
fd8a4221 GL |
1076 | } |
1077 | ||
3947be19 | 1078 | zone->present_pages += onlined_pages; |
aa47228a CS |
1079 | |
1080 | pgdat_resize_lock(zone->zone_pgdat, &flags); | |
f2937be5 | 1081 | zone->zone_pgdat->node_present_pages += onlined_pages; |
aa47228a CS |
1082 | pgdat_resize_unlock(zone->zone_pgdat, &flags); |
1083 | ||
08dff7b7 | 1084 | if (onlined_pages) { |
d9713679 | 1085 | node_states_set_node(zone_to_nid(zone), &arg); |
08dff7b7 | 1086 | if (need_zonelists_rebuild) |
6dcd73d7 | 1087 | build_all_zonelists(NULL, NULL); |
08dff7b7 JL |
1088 | else |
1089 | zone_pcp_update(zone); | |
1090 | } | |
3947be19 | 1091 | |
4eaf3f64 | 1092 | mutex_unlock(&zonelists_mutex); |
1b79acc9 KM |
1093 | |
1094 | init_per_zone_wmark_min(); | |
1095 | ||
08dff7b7 | 1096 | if (onlined_pages) |
7ea1530a | 1097 | kswapd_run(zone_to_nid(zone)); |
61b13993 | 1098 | |
1f522509 | 1099 | vm_total_pages = nr_free_pagecache_pages(); |
2f7f24ec | 1100 | |
2d1d43f6 | 1101 | writeback_set_ratelimit(); |
7b78d335 YG |
1102 | |
1103 | if (onlined_pages) | |
1104 | memory_notify(MEM_ONLINE, &arg); | |
30467e0b | 1105 | return 0; |
3947be19 | 1106 | } |
53947027 | 1107 | #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ |
bc02af93 | 1108 | |
0bd85420 TC |
1109 | static void reset_node_present_pages(pg_data_t *pgdat) |
1110 | { | |
1111 | struct zone *z; | |
1112 | ||
1113 | for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++) | |
1114 | z->present_pages = 0; | |
1115 | ||
1116 | pgdat->node_present_pages = 0; | |
1117 | } | |
1118 | ||
e1319331 HS |
1119 | /* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */ |
1120 | static pg_data_t __ref *hotadd_new_pgdat(int nid, u64 start) | |
9af3c2de YG |
1121 | { |
1122 | struct pglist_data *pgdat; | |
1123 | unsigned long zones_size[MAX_NR_ZONES] = {0}; | |
1124 | unsigned long zholes_size[MAX_NR_ZONES] = {0}; | |
c8e861a5 | 1125 | unsigned long start_pfn = PFN_DOWN(start); |
9af3c2de | 1126 | |
a1e565aa TC |
1127 | pgdat = NODE_DATA(nid); |
1128 | if (!pgdat) { | |
1129 | pgdat = arch_alloc_nodedata(nid); | |
1130 | if (!pgdat) | |
1131 | return NULL; | |
9af3c2de | 1132 | |
a1e565aa | 1133 | arch_refresh_nodedata(nid, pgdat); |
b0dc3a34 GZ |
1134 | } else { |
1135 | /* Reset the nr_zones and classzone_idx to 0 before reuse */ | |
1136 | pgdat->nr_zones = 0; | |
1137 | pgdat->classzone_idx = 0; | |
a1e565aa | 1138 | } |
9af3c2de YG |
1139 | |
1140 | /* we can use NODE_DATA(nid) from here */ | |
1141 | ||
1142 | /* init node's zones as empty zones, we don't have any present pages.*/ | |
9109fb7b | 1143 | free_area_init_node(nid, zones_size, start_pfn, zholes_size); |
9af3c2de | 1144 | |
959ecc48 KH |
1145 | /* |
1146 | * The node we allocated has no zone fallback lists. For avoiding | |
1147 | * to access not-initialized zonelist, build here. | |
1148 | */ | |
f957db4f | 1149 | mutex_lock(&zonelists_mutex); |
9adb62a5 | 1150 | build_all_zonelists(pgdat, NULL); |
f957db4f | 1151 | mutex_unlock(&zonelists_mutex); |
959ecc48 | 1152 | |
f784a3f1 TC |
1153 | /* |
1154 | * zone->managed_pages is set to an approximate value in | |
1155 | * free_area_init_core(), which will cause | |
1156 | * /sys/device/system/node/nodeX/meminfo has wrong data. | |
1157 | * So reset it to 0 before any memory is onlined. | |
1158 | */ | |
1159 | reset_node_managed_pages(pgdat); | |
1160 | ||
0bd85420 TC |
1161 | /* |
1162 | * When memory is hot-added, all the memory is in offline state. So | |
1163 | * clear all zones' present_pages because they will be updated in | |
1164 | * online_pages() and offline_pages(). | |
1165 | */ | |
1166 | reset_node_present_pages(pgdat); | |
1167 | ||
9af3c2de YG |
1168 | return pgdat; |
1169 | } | |
1170 | ||
1171 | static void rollback_node_hotadd(int nid, pg_data_t *pgdat) | |
1172 | { | |
1173 | arch_refresh_nodedata(nid, NULL); | |
1174 | arch_free_nodedata(pgdat); | |
1175 | return; | |
1176 | } | |
1177 | ||
0a547039 | 1178 | |
01b0f197 TK |
1179 | /** |
1180 | * try_online_node - online a node if offlined | |
1181 | * | |
cf23422b | 1182 | * called by cpu_up() to online a node without onlined memory. |
1183 | */ | |
01b0f197 | 1184 | int try_online_node(int nid) |
cf23422b | 1185 | { |
1186 | pg_data_t *pgdat; | |
1187 | int ret; | |
1188 | ||
01b0f197 TK |
1189 | if (node_online(nid)) |
1190 | return 0; | |
1191 | ||
bfc8c901 | 1192 | mem_hotplug_begin(); |
cf23422b | 1193 | pgdat = hotadd_new_pgdat(nid, 0); |
7553e8f2 | 1194 | if (!pgdat) { |
01b0f197 | 1195 | pr_err("Cannot online node %d due to NULL pgdat\n", nid); |
cf23422b | 1196 | ret = -ENOMEM; |
1197 | goto out; | |
1198 | } | |
1199 | node_set_online(nid); | |
1200 | ret = register_one_node(nid); | |
1201 | BUG_ON(ret); | |
1202 | ||
01b0f197 TK |
1203 | if (pgdat->node_zonelists->_zonerefs->zone == NULL) { |
1204 | mutex_lock(&zonelists_mutex); | |
1205 | build_all_zonelists(NULL, NULL); | |
1206 | mutex_unlock(&zonelists_mutex); | |
1207 | } | |
1208 | ||
cf23422b | 1209 | out: |
bfc8c901 | 1210 | mem_hotplug_done(); |
cf23422b | 1211 | return ret; |
1212 | } | |
1213 | ||
27356f54 TK |
1214 | static int check_hotplug_memory_range(u64 start, u64 size) |
1215 | { | |
c8e861a5 | 1216 | u64 start_pfn = PFN_DOWN(start); |
27356f54 TK |
1217 | u64 nr_pages = size >> PAGE_SHIFT; |
1218 | ||
1219 | /* Memory range must be aligned with section */ | |
1220 | if ((start_pfn & ~PAGE_SECTION_MASK) || | |
1221 | (nr_pages % PAGES_PER_SECTION) || (!nr_pages)) { | |
1222 | pr_err("Section-unaligned hotplug range: start 0x%llx, size 0x%llx\n", | |
1223 | (unsigned long long)start, | |
1224 | (unsigned long long)size); | |
1225 | return -EINVAL; | |
1226 | } | |
1227 | ||
1228 | return 0; | |
1229 | } | |
1230 | ||
63264400 WN |
1231 | /* |
1232 | * If movable zone has already been setup, newly added memory should be check. | |
1233 | * If its address is higher than movable zone, it should be added as movable. | |
1234 | * Without this check, movable zone may overlap with other zone. | |
1235 | */ | |
1236 | static int should_add_memory_movable(int nid, u64 start, u64 size) | |
1237 | { | |
1238 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
1239 | pg_data_t *pgdat = NODE_DATA(nid); | |
1240 | struct zone *movable_zone = pgdat->node_zones + ZONE_MOVABLE; | |
1241 | ||
1242 | if (zone_is_empty(movable_zone)) | |
1243 | return 0; | |
1244 | ||
1245 | if (movable_zone->zone_start_pfn <= start_pfn) | |
1246 | return 1; | |
1247 | ||
1248 | return 0; | |
1249 | } | |
1250 | ||
033fbae9 DW |
1251 | int zone_for_memory(int nid, u64 start, u64 size, int zone_default, |
1252 | bool for_device) | |
63264400 | 1253 | { |
033fbae9 DW |
1254 | #ifdef CONFIG_ZONE_DEVICE |
1255 | if (for_device) | |
1256 | return ZONE_DEVICE; | |
1257 | #endif | |
63264400 WN |
1258 | if (should_add_memory_movable(nid, start, size)) |
1259 | return ZONE_MOVABLE; | |
1260 | ||
1261 | return zone_default; | |
1262 | } | |
1263 | ||
31168481 | 1264 | /* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */ |
62cedb9f | 1265 | int __ref add_memory_resource(int nid, struct resource *res) |
bc02af93 | 1266 | { |
62cedb9f | 1267 | u64 start, size; |
9af3c2de | 1268 | pg_data_t *pgdat = NULL; |
a1e565aa TC |
1269 | bool new_pgdat; |
1270 | bool new_node; | |
bc02af93 YG |
1271 | int ret; |
1272 | ||
62cedb9f DV |
1273 | start = res->start; |
1274 | size = resource_size(res); | |
1275 | ||
27356f54 TK |
1276 | ret = check_hotplug_memory_range(start, size); |
1277 | if (ret) | |
1278 | return ret; | |
1279 | ||
a1e565aa TC |
1280 | { /* Stupid hack to suppress address-never-null warning */ |
1281 | void *p = NODE_DATA(nid); | |
1282 | new_pgdat = !p; | |
1283 | } | |
ac13c462 | 1284 | |
bfc8c901 | 1285 | mem_hotplug_begin(); |
ac13c462 | 1286 | |
7f36e3e5 TC |
1287 | /* |
1288 | * Add new range to memblock so that when hotadd_new_pgdat() is called | |
1289 | * to allocate new pgdat, get_pfn_range_for_nid() will be able to find | |
1290 | * this new range and calculate total pages correctly. The range will | |
1291 | * be removed at hot-remove time. | |
1292 | */ | |
1293 | memblock_add_node(start, size, nid); | |
1294 | ||
a1e565aa TC |
1295 | new_node = !node_online(nid); |
1296 | if (new_node) { | |
9af3c2de | 1297 | pgdat = hotadd_new_pgdat(nid, start); |
6ad696d2 | 1298 | ret = -ENOMEM; |
9af3c2de | 1299 | if (!pgdat) |
41b9e2d7 | 1300 | goto error; |
9af3c2de YG |
1301 | } |
1302 | ||
bc02af93 | 1303 | /* call arch's memory hotadd */ |
033fbae9 | 1304 | ret = arch_add_memory(nid, start, size, false); |
bc02af93 | 1305 | |
9af3c2de YG |
1306 | if (ret < 0) |
1307 | goto error; | |
1308 | ||
0fc44159 | 1309 | /* we online node here. we can't roll back from here. */ |
9af3c2de YG |
1310 | node_set_online(nid); |
1311 | ||
a1e565aa | 1312 | if (new_node) { |
0fc44159 YG |
1313 | ret = register_one_node(nid); |
1314 | /* | |
1315 | * If sysfs file of new node can't create, cpu on the node | |
1316 | * can't be hot-added. There is no rollback way now. | |
1317 | * So, check by BUG_ON() to catch it reluctantly.. | |
1318 | */ | |
1319 | BUG_ON(ret); | |
1320 | } | |
1321 | ||
d96ae530 | 1322 | /* create new memmap entry */ |
1323 | firmware_map_add_hotplug(start, start + size, "System RAM"); | |
1324 | ||
6ad696d2 AK |
1325 | goto out; |
1326 | ||
9af3c2de YG |
1327 | error: |
1328 | /* rollback pgdat allocation and others */ | |
1329 | if (new_pgdat) | |
1330 | rollback_node_hotadd(nid, pgdat); | |
7f36e3e5 | 1331 | memblock_remove(start, size); |
9af3c2de | 1332 | |
6ad696d2 | 1333 | out: |
bfc8c901 | 1334 | mem_hotplug_done(); |
bc02af93 YG |
1335 | return ret; |
1336 | } | |
62cedb9f DV |
1337 | EXPORT_SYMBOL_GPL(add_memory_resource); |
1338 | ||
1339 | int __ref add_memory(int nid, u64 start, u64 size) | |
1340 | { | |
1341 | struct resource *res; | |
1342 | int ret; | |
1343 | ||
1344 | res = register_memory_resource(start, size); | |
6f754ba4 VK |
1345 | if (IS_ERR(res)) |
1346 | return PTR_ERR(res); | |
62cedb9f DV |
1347 | |
1348 | ret = add_memory_resource(nid, res); | |
1349 | if (ret < 0) | |
1350 | release_memory_resource(res); | |
1351 | return ret; | |
1352 | } | |
bc02af93 | 1353 | EXPORT_SYMBOL_GPL(add_memory); |
0c0e6195 KH |
1354 | |
1355 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
5c755e9f BP |
1356 | /* |
1357 | * A free page on the buddy free lists (not the per-cpu lists) has PageBuddy | |
1358 | * set and the size of the free page is given by page_order(). Using this, | |
1359 | * the function determines if the pageblock contains only free pages. | |
1360 | * Due to buddy contraints, a free page at least the size of a pageblock will | |
1361 | * be located at the start of the pageblock | |
1362 | */ | |
1363 | static inline int pageblock_free(struct page *page) | |
1364 | { | |
1365 | return PageBuddy(page) && page_order(page) >= pageblock_order; | |
1366 | } | |
1367 | ||
1368 | /* Return the start of the next active pageblock after a given page */ | |
1369 | static struct page *next_active_pageblock(struct page *page) | |
1370 | { | |
5c755e9f BP |
1371 | /* Ensure the starting page is pageblock-aligned */ |
1372 | BUG_ON(page_to_pfn(page) & (pageblock_nr_pages - 1)); | |
1373 | ||
5c755e9f | 1374 | /* If the entire pageblock is free, move to the end of free page */ |
0dcc48c1 KH |
1375 | if (pageblock_free(page)) { |
1376 | int order; | |
1377 | /* be careful. we don't have locks, page_order can be changed.*/ | |
1378 | order = page_order(page); | |
1379 | if ((order < MAX_ORDER) && (order >= pageblock_order)) | |
1380 | return page + (1 << order); | |
1381 | } | |
5c755e9f | 1382 | |
0dcc48c1 | 1383 | return page + pageblock_nr_pages; |
5c755e9f BP |
1384 | } |
1385 | ||
1386 | /* Checks if this range of memory is likely to be hot-removable. */ | |
1387 | int is_mem_section_removable(unsigned long start_pfn, unsigned long nr_pages) | |
1388 | { | |
5c755e9f BP |
1389 | struct page *page = pfn_to_page(start_pfn); |
1390 | struct page *end_page = page + nr_pages; | |
1391 | ||
1392 | /* Check the starting page of each pageblock within the range */ | |
1393 | for (; page < end_page; page = next_active_pageblock(page)) { | |
49ac8255 | 1394 | if (!is_pageblock_removable_nolock(page)) |
5c755e9f | 1395 | return 0; |
49ac8255 | 1396 | cond_resched(); |
5c755e9f BP |
1397 | } |
1398 | ||
1399 | /* All pageblocks in the memory block are likely to be hot-removable */ | |
1400 | return 1; | |
1401 | } | |
1402 | ||
0c0e6195 KH |
1403 | /* |
1404 | * Confirm all pages in a range [start, end) is belongs to the same zone. | |
1405 | */ | |
ed2f2400 | 1406 | int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn) |
0c0e6195 | 1407 | { |
5f0f2887 | 1408 | unsigned long pfn, sec_end_pfn; |
0c0e6195 KH |
1409 | struct zone *zone = NULL; |
1410 | struct page *page; | |
1411 | int i; | |
5f0f2887 | 1412 | for (pfn = start_pfn, sec_end_pfn = SECTION_ALIGN_UP(start_pfn); |
0c0e6195 | 1413 | pfn < end_pfn; |
5f0f2887 AB |
1414 | pfn = sec_end_pfn + 1, sec_end_pfn += PAGES_PER_SECTION) { |
1415 | /* Make sure the memory section is present first */ | |
1416 | if (!present_section_nr(pfn_to_section_nr(pfn))) | |
0c0e6195 | 1417 | continue; |
5f0f2887 AB |
1418 | for (; pfn < sec_end_pfn && pfn < end_pfn; |
1419 | pfn += MAX_ORDER_NR_PAGES) { | |
1420 | i = 0; | |
1421 | /* This is just a CONFIG_HOLES_IN_ZONE check.*/ | |
1422 | while ((i < MAX_ORDER_NR_PAGES) && | |
1423 | !pfn_valid_within(pfn + i)) | |
1424 | i++; | |
1425 | if (i == MAX_ORDER_NR_PAGES) | |
1426 | continue; | |
1427 | page = pfn_to_page(pfn + i); | |
1428 | if (zone && page_zone(page) != zone) | |
1429 | return 0; | |
1430 | zone = page_zone(page); | |
1431 | } | |
0c0e6195 KH |
1432 | } |
1433 | return 1; | |
1434 | } | |
1435 | ||
1436 | /* | |
c8721bbb NH |
1437 | * Scan pfn range [start,end) to find movable/migratable pages (LRU pages |
1438 | * and hugepages). We scan pfn because it's much easier than scanning over | |
1439 | * linked list. This function returns the pfn of the first found movable | |
1440 | * page if it's found, otherwise 0. | |
0c0e6195 | 1441 | */ |
c8721bbb | 1442 | static unsigned long scan_movable_pages(unsigned long start, unsigned long end) |
0c0e6195 KH |
1443 | { |
1444 | unsigned long pfn; | |
1445 | struct page *page; | |
1446 | for (pfn = start; pfn < end; pfn++) { | |
1447 | if (pfn_valid(pfn)) { | |
1448 | page = pfn_to_page(pfn); | |
1449 | if (PageLRU(page)) | |
1450 | return pfn; | |
c8721bbb | 1451 | if (PageHuge(page)) { |
7e1f049e | 1452 | if (page_huge_active(page)) |
c8721bbb NH |
1453 | return pfn; |
1454 | else | |
1455 | pfn = round_up(pfn + 1, | |
1456 | 1 << compound_order(page)) - 1; | |
1457 | } | |
0c0e6195 KH |
1458 | } |
1459 | } | |
1460 | return 0; | |
1461 | } | |
1462 | ||
0c0e6195 KH |
1463 | #define NR_OFFLINE_AT_ONCE_PAGES (256) |
1464 | static int | |
1465 | do_migrate_range(unsigned long start_pfn, unsigned long end_pfn) | |
1466 | { | |
1467 | unsigned long pfn; | |
1468 | struct page *page; | |
1469 | int move_pages = NR_OFFLINE_AT_ONCE_PAGES; | |
1470 | int not_managed = 0; | |
1471 | int ret = 0; | |
1472 | LIST_HEAD(source); | |
1473 | ||
1474 | for (pfn = start_pfn; pfn < end_pfn && move_pages > 0; pfn++) { | |
1475 | if (!pfn_valid(pfn)) | |
1476 | continue; | |
1477 | page = pfn_to_page(pfn); | |
c8721bbb NH |
1478 | |
1479 | if (PageHuge(page)) { | |
1480 | struct page *head = compound_head(page); | |
1481 | pfn = page_to_pfn(head) + (1<<compound_order(head)) - 1; | |
1482 | if (compound_order(head) > PFN_SECTION_SHIFT) { | |
1483 | ret = -EBUSY; | |
1484 | break; | |
1485 | } | |
1486 | if (isolate_huge_page(page, &source)) | |
1487 | move_pages -= 1 << compound_order(head); | |
1488 | continue; | |
1489 | } | |
1490 | ||
700c2a46 | 1491 | if (!get_page_unless_zero(page)) |
0c0e6195 KH |
1492 | continue; |
1493 | /* | |
1494 | * We can skip free pages. And we can only deal with pages on | |
1495 | * LRU. | |
1496 | */ | |
62695a84 | 1497 | ret = isolate_lru_page(page); |
0c0e6195 | 1498 | if (!ret) { /* Success */ |
700c2a46 | 1499 | put_page(page); |
62695a84 | 1500 | list_add_tail(&page->lru, &source); |
0c0e6195 | 1501 | move_pages--; |
6d9c285a KM |
1502 | inc_zone_page_state(page, NR_ISOLATED_ANON + |
1503 | page_is_file_cache(page)); | |
1504 | ||
0c0e6195 | 1505 | } else { |
0c0e6195 | 1506 | #ifdef CONFIG_DEBUG_VM |
718a3821 WF |
1507 | printk(KERN_ALERT "removing pfn %lx from LRU failed\n", |
1508 | pfn); | |
f0b791a3 | 1509 | dump_page(page, "failed to remove from LRU"); |
0c0e6195 | 1510 | #endif |
700c2a46 | 1511 | put_page(page); |
25985edc | 1512 | /* Because we don't have big zone->lock. we should |
809c4449 BL |
1513 | check this again here. */ |
1514 | if (page_count(page)) { | |
1515 | not_managed++; | |
f3ab2636 | 1516 | ret = -EBUSY; |
809c4449 BL |
1517 | break; |
1518 | } | |
0c0e6195 KH |
1519 | } |
1520 | } | |
f3ab2636 BL |
1521 | if (!list_empty(&source)) { |
1522 | if (not_managed) { | |
c8721bbb | 1523 | putback_movable_pages(&source); |
f3ab2636 BL |
1524 | goto out; |
1525 | } | |
74c08f98 MK |
1526 | |
1527 | /* | |
1528 | * alloc_migrate_target should be improooooved!! | |
1529 | * migrate_pages returns # of failed pages. | |
1530 | */ | |
68711a74 | 1531 | ret = migrate_pages(&source, alloc_migrate_target, NULL, 0, |
9c620e2b | 1532 | MIGRATE_SYNC, MR_MEMORY_HOTPLUG); |
f3ab2636 | 1533 | if (ret) |
c8721bbb | 1534 | putback_movable_pages(&source); |
0c0e6195 | 1535 | } |
0c0e6195 KH |
1536 | out: |
1537 | return ret; | |
1538 | } | |
1539 | ||
1540 | /* | |
1541 | * remove from free_area[] and mark all as Reserved. | |
1542 | */ | |
1543 | static int | |
1544 | offline_isolated_pages_cb(unsigned long start, unsigned long nr_pages, | |
1545 | void *data) | |
1546 | { | |
1547 | __offline_isolated_pages(start, start + nr_pages); | |
1548 | return 0; | |
1549 | } | |
1550 | ||
1551 | static void | |
1552 | offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn) | |
1553 | { | |
908eedc6 | 1554 | walk_system_ram_range(start_pfn, end_pfn - start_pfn, NULL, |
0c0e6195 KH |
1555 | offline_isolated_pages_cb); |
1556 | } | |
1557 | ||
1558 | /* | |
1559 | * Check all pages in range, recoreded as memory resource, are isolated. | |
1560 | */ | |
1561 | static int | |
1562 | check_pages_isolated_cb(unsigned long start_pfn, unsigned long nr_pages, | |
1563 | void *data) | |
1564 | { | |
1565 | int ret; | |
1566 | long offlined = *(long *)data; | |
b023f468 | 1567 | ret = test_pages_isolated(start_pfn, start_pfn + nr_pages, true); |
0c0e6195 KH |
1568 | offlined = nr_pages; |
1569 | if (!ret) | |
1570 | *(long *)data += offlined; | |
1571 | return ret; | |
1572 | } | |
1573 | ||
1574 | static long | |
1575 | check_pages_isolated(unsigned long start_pfn, unsigned long end_pfn) | |
1576 | { | |
1577 | long offlined = 0; | |
1578 | int ret; | |
1579 | ||
908eedc6 | 1580 | ret = walk_system_ram_range(start_pfn, end_pfn - start_pfn, &offlined, |
0c0e6195 KH |
1581 | check_pages_isolated_cb); |
1582 | if (ret < 0) | |
1583 | offlined = (long)ret; | |
1584 | return offlined; | |
1585 | } | |
1586 | ||
09285af7 | 1587 | #ifdef CONFIG_MOVABLE_NODE |
79a4dcef TC |
1588 | /* |
1589 | * When CONFIG_MOVABLE_NODE, we permit offlining of a node which doesn't have | |
1590 | * normal memory. | |
1591 | */ | |
09285af7 LJ |
1592 | static bool can_offline_normal(struct zone *zone, unsigned long nr_pages) |
1593 | { | |
1594 | return true; | |
1595 | } | |
79a4dcef | 1596 | #else /* CONFIG_MOVABLE_NODE */ |
74d42d8f LJ |
1597 | /* ensure the node has NORMAL memory if it is still online */ |
1598 | static bool can_offline_normal(struct zone *zone, unsigned long nr_pages) | |
1599 | { | |
1600 | struct pglist_data *pgdat = zone->zone_pgdat; | |
1601 | unsigned long present_pages = 0; | |
1602 | enum zone_type zt; | |
1603 | ||
1604 | for (zt = 0; zt <= ZONE_NORMAL; zt++) | |
1605 | present_pages += pgdat->node_zones[zt].present_pages; | |
1606 | ||
1607 | if (present_pages > nr_pages) | |
1608 | return true; | |
1609 | ||
1610 | present_pages = 0; | |
1611 | for (; zt <= ZONE_MOVABLE; zt++) | |
1612 | present_pages += pgdat->node_zones[zt].present_pages; | |
1613 | ||
1614 | /* | |
1615 | * we can't offline the last normal memory until all | |
1616 | * higher memory is offlined. | |
1617 | */ | |
1618 | return present_pages == 0; | |
1619 | } | |
79a4dcef | 1620 | #endif /* CONFIG_MOVABLE_NODE */ |
74d42d8f | 1621 | |
c5320926 TC |
1622 | static int __init cmdline_parse_movable_node(char *p) |
1623 | { | |
1624 | #ifdef CONFIG_MOVABLE_NODE | |
1625 | /* | |
1626 | * Memory used by the kernel cannot be hot-removed because Linux | |
1627 | * cannot migrate the kernel pages. When memory hotplug is | |
1628 | * enabled, we should prevent memblock from allocating memory | |
1629 | * for the kernel. | |
1630 | * | |
1631 | * ACPI SRAT records all hotpluggable memory ranges. But before | |
1632 | * SRAT is parsed, we don't know about it. | |
1633 | * | |
1634 | * The kernel image is loaded into memory at very early time. We | |
1635 | * cannot prevent this anyway. So on NUMA system, we set any | |
1636 | * node the kernel resides in as un-hotpluggable. | |
1637 | * | |
1638 | * Since on modern servers, one node could have double-digit | |
1639 | * gigabytes memory, we can assume the memory around the kernel | |
1640 | * image is also un-hotpluggable. So before SRAT is parsed, just | |
1641 | * allocate memory near the kernel image to try the best to keep | |
1642 | * the kernel away from hotpluggable memory. | |
1643 | */ | |
1644 | memblock_set_bottom_up(true); | |
55ac590c | 1645 | movable_node_enabled = true; |
c5320926 TC |
1646 | #else |
1647 | pr_warn("movable_node option not supported\n"); | |
1648 | #endif | |
1649 | return 0; | |
1650 | } | |
1651 | early_param("movable_node", cmdline_parse_movable_node); | |
1652 | ||
d9713679 LJ |
1653 | /* check which state of node_states will be changed when offline memory */ |
1654 | static void node_states_check_changes_offline(unsigned long nr_pages, | |
1655 | struct zone *zone, struct memory_notify *arg) | |
1656 | { | |
1657 | struct pglist_data *pgdat = zone->zone_pgdat; | |
1658 | unsigned long present_pages = 0; | |
1659 | enum zone_type zt, zone_last = ZONE_NORMAL; | |
1660 | ||
1661 | /* | |
6715ddf9 LJ |
1662 | * If we have HIGHMEM or movable node, node_states[N_NORMAL_MEMORY] |
1663 | * contains nodes which have zones of 0...ZONE_NORMAL, | |
1664 | * set zone_last to ZONE_NORMAL. | |
d9713679 | 1665 | * |
6715ddf9 LJ |
1666 | * If we don't have HIGHMEM nor movable node, |
1667 | * node_states[N_NORMAL_MEMORY] contains nodes which have zones of | |
1668 | * 0...ZONE_MOVABLE, set zone_last to ZONE_MOVABLE. | |
d9713679 | 1669 | */ |
6715ddf9 | 1670 | if (N_MEMORY == N_NORMAL_MEMORY) |
d9713679 LJ |
1671 | zone_last = ZONE_MOVABLE; |
1672 | ||
1673 | /* | |
1674 | * check whether node_states[N_NORMAL_MEMORY] will be changed. | |
1675 | * If the memory to be offline is in a zone of 0...zone_last, | |
1676 | * and it is the last present memory, 0...zone_last will | |
1677 | * become empty after offline , thus we can determind we will | |
1678 | * need to clear the node from node_states[N_NORMAL_MEMORY]. | |
1679 | */ | |
1680 | for (zt = 0; zt <= zone_last; zt++) | |
1681 | present_pages += pgdat->node_zones[zt].present_pages; | |
1682 | if (zone_idx(zone) <= zone_last && nr_pages >= present_pages) | |
1683 | arg->status_change_nid_normal = zone_to_nid(zone); | |
1684 | else | |
1685 | arg->status_change_nid_normal = -1; | |
1686 | ||
6715ddf9 LJ |
1687 | #ifdef CONFIG_HIGHMEM |
1688 | /* | |
1689 | * If we have movable node, node_states[N_HIGH_MEMORY] | |
1690 | * contains nodes which have zones of 0...ZONE_HIGHMEM, | |
1691 | * set zone_last to ZONE_HIGHMEM. | |
1692 | * | |
1693 | * If we don't have movable node, node_states[N_NORMAL_MEMORY] | |
1694 | * contains nodes which have zones of 0...ZONE_MOVABLE, | |
1695 | * set zone_last to ZONE_MOVABLE. | |
1696 | */ | |
1697 | zone_last = ZONE_HIGHMEM; | |
1698 | if (N_MEMORY == N_HIGH_MEMORY) | |
1699 | zone_last = ZONE_MOVABLE; | |
1700 | ||
1701 | for (; zt <= zone_last; zt++) | |
1702 | present_pages += pgdat->node_zones[zt].present_pages; | |
1703 | if (zone_idx(zone) <= zone_last && nr_pages >= present_pages) | |
1704 | arg->status_change_nid_high = zone_to_nid(zone); | |
1705 | else | |
1706 | arg->status_change_nid_high = -1; | |
1707 | #else | |
1708 | arg->status_change_nid_high = arg->status_change_nid_normal; | |
1709 | #endif | |
1710 | ||
d9713679 LJ |
1711 | /* |
1712 | * node_states[N_HIGH_MEMORY] contains nodes which have 0...ZONE_MOVABLE | |
1713 | */ | |
1714 | zone_last = ZONE_MOVABLE; | |
1715 | ||
1716 | /* | |
1717 | * check whether node_states[N_HIGH_MEMORY] will be changed | |
1718 | * If we try to offline the last present @nr_pages from the node, | |
1719 | * we can determind we will need to clear the node from | |
1720 | * node_states[N_HIGH_MEMORY]. | |
1721 | */ | |
1722 | for (; zt <= zone_last; zt++) | |
1723 | present_pages += pgdat->node_zones[zt].present_pages; | |
1724 | if (nr_pages >= present_pages) | |
1725 | arg->status_change_nid = zone_to_nid(zone); | |
1726 | else | |
1727 | arg->status_change_nid = -1; | |
1728 | } | |
1729 | ||
1730 | static void node_states_clear_node(int node, struct memory_notify *arg) | |
1731 | { | |
1732 | if (arg->status_change_nid_normal >= 0) | |
1733 | node_clear_state(node, N_NORMAL_MEMORY); | |
1734 | ||
6715ddf9 LJ |
1735 | if ((N_MEMORY != N_NORMAL_MEMORY) && |
1736 | (arg->status_change_nid_high >= 0)) | |
d9713679 | 1737 | node_clear_state(node, N_HIGH_MEMORY); |
6715ddf9 LJ |
1738 | |
1739 | if ((N_MEMORY != N_HIGH_MEMORY) && | |
1740 | (arg->status_change_nid >= 0)) | |
1741 | node_clear_state(node, N_MEMORY); | |
d9713679 LJ |
1742 | } |
1743 | ||
a16cee10 | 1744 | static int __ref __offline_pages(unsigned long start_pfn, |
0c0e6195 KH |
1745 | unsigned long end_pfn, unsigned long timeout) |
1746 | { | |
1747 | unsigned long pfn, nr_pages, expire; | |
1748 | long offlined_pages; | |
7b78d335 | 1749 | int ret, drain, retry_max, node; |
d702909f | 1750 | unsigned long flags; |
0c0e6195 | 1751 | struct zone *zone; |
7b78d335 | 1752 | struct memory_notify arg; |
0c0e6195 | 1753 | |
0c0e6195 KH |
1754 | /* at least, alignment against pageblock is necessary */ |
1755 | if (!IS_ALIGNED(start_pfn, pageblock_nr_pages)) | |
1756 | return -EINVAL; | |
1757 | if (!IS_ALIGNED(end_pfn, pageblock_nr_pages)) | |
1758 | return -EINVAL; | |
1759 | /* This makes hotplug much easier...and readable. | |
1760 | we assume this for now. .*/ | |
1761 | if (!test_pages_in_a_zone(start_pfn, end_pfn)) | |
1762 | return -EINVAL; | |
7b78d335 YG |
1763 | |
1764 | zone = page_zone(pfn_to_page(start_pfn)); | |
1765 | node = zone_to_nid(zone); | |
1766 | nr_pages = end_pfn - start_pfn; | |
1767 | ||
74d42d8f | 1768 | if (zone_idx(zone) <= ZONE_NORMAL && !can_offline_normal(zone, nr_pages)) |
30467e0b | 1769 | return -EINVAL; |
74d42d8f | 1770 | |
0c0e6195 | 1771 | /* set above range as isolated */ |
b023f468 WC |
1772 | ret = start_isolate_page_range(start_pfn, end_pfn, |
1773 | MIGRATE_MOVABLE, true); | |
0c0e6195 | 1774 | if (ret) |
30467e0b | 1775 | return ret; |
7b78d335 YG |
1776 | |
1777 | arg.start_pfn = start_pfn; | |
1778 | arg.nr_pages = nr_pages; | |
d9713679 | 1779 | node_states_check_changes_offline(nr_pages, zone, &arg); |
7b78d335 YG |
1780 | |
1781 | ret = memory_notify(MEM_GOING_OFFLINE, &arg); | |
1782 | ret = notifier_to_errno(ret); | |
1783 | if (ret) | |
1784 | goto failed_removal; | |
1785 | ||
0c0e6195 KH |
1786 | pfn = start_pfn; |
1787 | expire = jiffies + timeout; | |
1788 | drain = 0; | |
1789 | retry_max = 5; | |
1790 | repeat: | |
1791 | /* start memory hot removal */ | |
1792 | ret = -EAGAIN; | |
1793 | if (time_after(jiffies, expire)) | |
1794 | goto failed_removal; | |
1795 | ret = -EINTR; | |
1796 | if (signal_pending(current)) | |
1797 | goto failed_removal; | |
1798 | ret = 0; | |
1799 | if (drain) { | |
1800 | lru_add_drain_all(); | |
0c0e6195 | 1801 | cond_resched(); |
c0554329 | 1802 | drain_all_pages(zone); |
0c0e6195 KH |
1803 | } |
1804 | ||
c8721bbb NH |
1805 | pfn = scan_movable_pages(start_pfn, end_pfn); |
1806 | if (pfn) { /* We have movable pages */ | |
0c0e6195 KH |
1807 | ret = do_migrate_range(pfn, end_pfn); |
1808 | if (!ret) { | |
1809 | drain = 1; | |
1810 | goto repeat; | |
1811 | } else { | |
1812 | if (ret < 0) | |
1813 | if (--retry_max == 0) | |
1814 | goto failed_removal; | |
1815 | yield(); | |
1816 | drain = 1; | |
1817 | goto repeat; | |
1818 | } | |
1819 | } | |
b3834be5 | 1820 | /* drain all zone's lru pagevec, this is asynchronous... */ |
0c0e6195 | 1821 | lru_add_drain_all(); |
0c0e6195 | 1822 | yield(); |
b3834be5 | 1823 | /* drain pcp pages, this is synchronous. */ |
c0554329 | 1824 | drain_all_pages(zone); |
c8721bbb NH |
1825 | /* |
1826 | * dissolve free hugepages in the memory block before doing offlining | |
1827 | * actually in order to make hugetlbfs's object counting consistent. | |
1828 | */ | |
1829 | dissolve_free_huge_pages(start_pfn, end_pfn); | |
0c0e6195 KH |
1830 | /* check again */ |
1831 | offlined_pages = check_pages_isolated(start_pfn, end_pfn); | |
1832 | if (offlined_pages < 0) { | |
1833 | ret = -EBUSY; | |
1834 | goto failed_removal; | |
1835 | } | |
1836 | printk(KERN_INFO "Offlined Pages %ld\n", offlined_pages); | |
b3834be5 | 1837 | /* Ok, all of our target is isolated. |
0c0e6195 KH |
1838 | We cannot do rollback at this point. */ |
1839 | offline_isolated_pages(start_pfn, end_pfn); | |
dbc0e4ce | 1840 | /* reset pagetype flags and makes migrate type to be MOVABLE */ |
0815f3d8 | 1841 | undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE); |
0c0e6195 | 1842 | /* removal success */ |
3dcc0571 | 1843 | adjust_managed_page_count(pfn_to_page(start_pfn), -offlined_pages); |
0c0e6195 | 1844 | zone->present_pages -= offlined_pages; |
d702909f CS |
1845 | |
1846 | pgdat_resize_lock(zone->zone_pgdat, &flags); | |
0c0e6195 | 1847 | zone->zone_pgdat->node_present_pages -= offlined_pages; |
d702909f | 1848 | pgdat_resize_unlock(zone->zone_pgdat, &flags); |
7b78d335 | 1849 | |
1b79acc9 KM |
1850 | init_per_zone_wmark_min(); |
1851 | ||
1e8537ba | 1852 | if (!populated_zone(zone)) { |
340175b7 | 1853 | zone_pcp_reset(zone); |
1e8537ba XQ |
1854 | mutex_lock(&zonelists_mutex); |
1855 | build_all_zonelists(NULL, NULL); | |
1856 | mutex_unlock(&zonelists_mutex); | |
1857 | } else | |
1858 | zone_pcp_update(zone); | |
340175b7 | 1859 | |
d9713679 LJ |
1860 | node_states_clear_node(node, &arg); |
1861 | if (arg.status_change_nid >= 0) | |
8fe23e05 | 1862 | kswapd_stop(node); |
bce7394a | 1863 | |
0c0e6195 KH |
1864 | vm_total_pages = nr_free_pagecache_pages(); |
1865 | writeback_set_ratelimit(); | |
7b78d335 YG |
1866 | |
1867 | memory_notify(MEM_OFFLINE, &arg); | |
0c0e6195 KH |
1868 | return 0; |
1869 | ||
1870 | failed_removal: | |
a62e2f4f BH |
1871 | printk(KERN_INFO "memory offlining [mem %#010llx-%#010llx] failed\n", |
1872 | (unsigned long long) start_pfn << PAGE_SHIFT, | |
1873 | ((unsigned long long) end_pfn << PAGE_SHIFT) - 1); | |
7b78d335 | 1874 | memory_notify(MEM_CANCEL_OFFLINE, &arg); |
0c0e6195 | 1875 | /* pushback to free area */ |
0815f3d8 | 1876 | undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE); |
0c0e6195 KH |
1877 | return ret; |
1878 | } | |
71088785 | 1879 | |
30467e0b | 1880 | /* Must be protected by mem_hotplug_begin() */ |
a16cee10 WC |
1881 | int offline_pages(unsigned long start_pfn, unsigned long nr_pages) |
1882 | { | |
1883 | return __offline_pages(start_pfn, start_pfn + nr_pages, 120 * HZ); | |
1884 | } | |
e2ff3940 | 1885 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
a16cee10 | 1886 | |
bbc76be6 WC |
1887 | /** |
1888 | * walk_memory_range - walks through all mem sections in [start_pfn, end_pfn) | |
1889 | * @start_pfn: start pfn of the memory range | |
e05c4bbf | 1890 | * @end_pfn: end pfn of the memory range |
bbc76be6 WC |
1891 | * @arg: argument passed to func |
1892 | * @func: callback for each memory section walked | |
1893 | * | |
1894 | * This function walks through all present mem sections in range | |
1895 | * [start_pfn, end_pfn) and call func on each mem section. | |
1896 | * | |
1897 | * Returns the return value of func. | |
1898 | */ | |
e2ff3940 | 1899 | int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn, |
bbc76be6 | 1900 | void *arg, int (*func)(struct memory_block *, void *)) |
71088785 | 1901 | { |
e90bdb7f WC |
1902 | struct memory_block *mem = NULL; |
1903 | struct mem_section *section; | |
e90bdb7f WC |
1904 | unsigned long pfn, section_nr; |
1905 | int ret; | |
e90bdb7f WC |
1906 | |
1907 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { | |
1908 | section_nr = pfn_to_section_nr(pfn); | |
1909 | if (!present_section_nr(section_nr)) | |
1910 | continue; | |
1911 | ||
1912 | section = __nr_to_section(section_nr); | |
1913 | /* same memblock? */ | |
1914 | if (mem) | |
1915 | if ((section_nr >= mem->start_section_nr) && | |
1916 | (section_nr <= mem->end_section_nr)) | |
1917 | continue; | |
1918 | ||
1919 | mem = find_memory_block_hinted(section, mem); | |
1920 | if (!mem) | |
1921 | continue; | |
1922 | ||
bbc76be6 | 1923 | ret = func(mem, arg); |
e90bdb7f | 1924 | if (ret) { |
bbc76be6 WC |
1925 | kobject_put(&mem->dev.kobj); |
1926 | return ret; | |
e90bdb7f WC |
1927 | } |
1928 | } | |
1929 | ||
1930 | if (mem) | |
1931 | kobject_put(&mem->dev.kobj); | |
1932 | ||
bbc76be6 WC |
1933 | return 0; |
1934 | } | |
1935 | ||
e2ff3940 | 1936 | #ifdef CONFIG_MEMORY_HOTREMOVE |
d6de9d53 | 1937 | static int check_memblock_offlined_cb(struct memory_block *mem, void *arg) |
bbc76be6 WC |
1938 | { |
1939 | int ret = !is_memblock_offlined(mem); | |
1940 | ||
349daa0f RD |
1941 | if (unlikely(ret)) { |
1942 | phys_addr_t beginpa, endpa; | |
1943 | ||
1944 | beginpa = PFN_PHYS(section_nr_to_pfn(mem->start_section_nr)); | |
1945 | endpa = PFN_PHYS(section_nr_to_pfn(mem->end_section_nr + 1))-1; | |
bbc76be6 | 1946 | pr_warn("removing memory fails, because memory " |
349daa0f RD |
1947 | "[%pa-%pa] is onlined\n", |
1948 | &beginpa, &endpa); | |
1949 | } | |
bbc76be6 WC |
1950 | |
1951 | return ret; | |
1952 | } | |
1953 | ||
0f1cfe9d | 1954 | static int check_cpu_on_node(pg_data_t *pgdat) |
60a5a19e | 1955 | { |
60a5a19e TC |
1956 | int cpu; |
1957 | ||
1958 | for_each_present_cpu(cpu) { | |
1959 | if (cpu_to_node(cpu) == pgdat->node_id) | |
1960 | /* | |
1961 | * the cpu on this node isn't removed, and we can't | |
1962 | * offline this node. | |
1963 | */ | |
1964 | return -EBUSY; | |
1965 | } | |
1966 | ||
1967 | return 0; | |
1968 | } | |
1969 | ||
0f1cfe9d | 1970 | static void unmap_cpu_on_node(pg_data_t *pgdat) |
e13fe869 WC |
1971 | { |
1972 | #ifdef CONFIG_ACPI_NUMA | |
e13fe869 WC |
1973 | int cpu; |
1974 | ||
1975 | for_each_possible_cpu(cpu) | |
1976 | if (cpu_to_node(cpu) == pgdat->node_id) | |
1977 | numa_clear_node(cpu); | |
1978 | #endif | |
1979 | } | |
1980 | ||
0f1cfe9d | 1981 | static int check_and_unmap_cpu_on_node(pg_data_t *pgdat) |
e13fe869 | 1982 | { |
0f1cfe9d | 1983 | int ret; |
e13fe869 | 1984 | |
0f1cfe9d | 1985 | ret = check_cpu_on_node(pgdat); |
e13fe869 WC |
1986 | if (ret) |
1987 | return ret; | |
1988 | ||
1989 | /* | |
1990 | * the node will be offlined when we come here, so we can clear | |
1991 | * the cpu_to_node() now. | |
1992 | */ | |
1993 | ||
0f1cfe9d | 1994 | unmap_cpu_on_node(pgdat); |
e13fe869 WC |
1995 | return 0; |
1996 | } | |
1997 | ||
0f1cfe9d TK |
1998 | /** |
1999 | * try_offline_node | |
2000 | * | |
2001 | * Offline a node if all memory sections and cpus of the node are removed. | |
2002 | * | |
2003 | * NOTE: The caller must call lock_device_hotplug() to serialize hotplug | |
2004 | * and online/offline operations before this call. | |
2005 | */ | |
90b30cdc | 2006 | void try_offline_node(int nid) |
60a5a19e | 2007 | { |
d822b86a WC |
2008 | pg_data_t *pgdat = NODE_DATA(nid); |
2009 | unsigned long start_pfn = pgdat->node_start_pfn; | |
2010 | unsigned long end_pfn = start_pfn + pgdat->node_spanned_pages; | |
60a5a19e | 2011 | unsigned long pfn; |
d822b86a | 2012 | int i; |
60a5a19e TC |
2013 | |
2014 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { | |
2015 | unsigned long section_nr = pfn_to_section_nr(pfn); | |
2016 | ||
2017 | if (!present_section_nr(section_nr)) | |
2018 | continue; | |
2019 | ||
2020 | if (pfn_to_nid(pfn) != nid) | |
2021 | continue; | |
2022 | ||
2023 | /* | |
2024 | * some memory sections of this node are not removed, and we | |
2025 | * can't offline node now. | |
2026 | */ | |
2027 | return; | |
2028 | } | |
2029 | ||
0f1cfe9d | 2030 | if (check_and_unmap_cpu_on_node(pgdat)) |
60a5a19e TC |
2031 | return; |
2032 | ||
2033 | /* | |
2034 | * all memory/cpu of this node are removed, we can offline this | |
2035 | * node now. | |
2036 | */ | |
2037 | node_set_offline(nid); | |
2038 | unregister_one_node(nid); | |
d822b86a | 2039 | |
d822b86a WC |
2040 | /* free waittable in each zone */ |
2041 | for (i = 0; i < MAX_NR_ZONES; i++) { | |
2042 | struct zone *zone = pgdat->node_zones + i; | |
2043 | ||
ca4b3f30 JW |
2044 | /* |
2045 | * wait_table may be allocated from boot memory, | |
2046 | * here only free if it's allocated by vmalloc. | |
2047 | */ | |
85bd8399 | 2048 | if (is_vmalloc_addr(zone->wait_table)) { |
d822b86a | 2049 | vfree(zone->wait_table); |
85bd8399 GZ |
2050 | zone->wait_table = NULL; |
2051 | } | |
d822b86a | 2052 | } |
60a5a19e | 2053 | } |
90b30cdc | 2054 | EXPORT_SYMBOL(try_offline_node); |
60a5a19e | 2055 | |
0f1cfe9d TK |
2056 | /** |
2057 | * remove_memory | |
2058 | * | |
2059 | * NOTE: The caller must call lock_device_hotplug() to serialize hotplug | |
2060 | * and online/offline operations before this call, as required by | |
2061 | * try_offline_node(). | |
2062 | */ | |
242831eb | 2063 | void __ref remove_memory(int nid, u64 start, u64 size) |
bbc76be6 | 2064 | { |
242831eb | 2065 | int ret; |
993c1aad | 2066 | |
27356f54 TK |
2067 | BUG_ON(check_hotplug_memory_range(start, size)); |
2068 | ||
bfc8c901 | 2069 | mem_hotplug_begin(); |
6677e3ea YI |
2070 | |
2071 | /* | |
242831eb RW |
2072 | * All memory blocks must be offlined before removing memory. Check |
2073 | * whether all memory blocks in question are offline and trigger a BUG() | |
2074 | * if this is not the case. | |
6677e3ea | 2075 | */ |
242831eb | 2076 | ret = walk_memory_range(PFN_DOWN(start), PFN_UP(start + size - 1), NULL, |
d6de9d53 | 2077 | check_memblock_offlined_cb); |
bfc8c901 | 2078 | if (ret) |
242831eb | 2079 | BUG(); |
6677e3ea | 2080 | |
46c66c4b YI |
2081 | /* remove memmap entry */ |
2082 | firmware_map_remove(start, start + size, "System RAM"); | |
f9126ab9 XQ |
2083 | memblock_free(start, size); |
2084 | memblock_remove(start, size); | |
46c66c4b | 2085 | |
24d335ca WC |
2086 | arch_remove_memory(start, size); |
2087 | ||
60a5a19e TC |
2088 | try_offline_node(nid); |
2089 | ||
bfc8c901 | 2090 | mem_hotplug_done(); |
71088785 | 2091 | } |
71088785 | 2092 | EXPORT_SYMBOL_GPL(remove_memory); |
aba6efc4 | 2093 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |