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> |
698b1b30 | 36 | #include <linux/compaction.h> |
3947be19 DH |
37 | |
38 | #include <asm/tlbflush.h> | |
39 | ||
1e5ad9a3 AB |
40 | #include "internal.h" |
41 | ||
9d0ad8ca DK |
42 | /* |
43 | * online_page_callback contains pointer to current page onlining function. | |
44 | * Initially it is generic_online_page(). If it is required it could be | |
45 | * changed by calling set_online_page_callback() for callback registration | |
46 | * and restore_online_page_callback() for generic callback restore. | |
47 | */ | |
48 | ||
49 | static void generic_online_page(struct page *page); | |
50 | ||
51 | static online_page_callback_t online_page_callback = generic_online_page; | |
bfc8c901 | 52 | static DEFINE_MUTEX(online_page_callback_lock); |
9d0ad8ca | 53 | |
bfc8c901 VD |
54 | /* The same as the cpu_hotplug lock, but for memory hotplug. */ |
55 | static struct { | |
56 | struct task_struct *active_writer; | |
57 | struct mutex lock; /* Synchronizes accesses to refcount, */ | |
58 | /* | |
59 | * Also blocks the new readers during | |
60 | * an ongoing mem hotplug operation. | |
61 | */ | |
62 | int refcount; | |
63 | ||
64 | #ifdef CONFIG_DEBUG_LOCK_ALLOC | |
65 | struct lockdep_map dep_map; | |
66 | #endif | |
67 | } mem_hotplug = { | |
68 | .active_writer = NULL, | |
69 | .lock = __MUTEX_INITIALIZER(mem_hotplug.lock), | |
70 | .refcount = 0, | |
71 | #ifdef CONFIG_DEBUG_LOCK_ALLOC | |
72 | .dep_map = {.name = "mem_hotplug.lock" }, | |
73 | #endif | |
74 | }; | |
75 | ||
76 | /* Lockdep annotations for get/put_online_mems() and mem_hotplug_begin/end() */ | |
77 | #define memhp_lock_acquire_read() lock_map_acquire_read(&mem_hotplug.dep_map) | |
78 | #define memhp_lock_acquire() lock_map_acquire(&mem_hotplug.dep_map) | |
79 | #define memhp_lock_release() lock_map_release(&mem_hotplug.dep_map) | |
80 | ||
31bc3858 VK |
81 | bool memhp_auto_online; |
82 | EXPORT_SYMBOL_GPL(memhp_auto_online); | |
83 | ||
bfc8c901 VD |
84 | void get_online_mems(void) |
85 | { | |
86 | might_sleep(); | |
87 | if (mem_hotplug.active_writer == current) | |
88 | return; | |
89 | memhp_lock_acquire_read(); | |
90 | mutex_lock(&mem_hotplug.lock); | |
91 | mem_hotplug.refcount++; | |
92 | mutex_unlock(&mem_hotplug.lock); | |
93 | ||
94 | } | |
20d6c96b | 95 | |
bfc8c901 | 96 | void put_online_mems(void) |
20d6c96b | 97 | { |
bfc8c901 VD |
98 | if (mem_hotplug.active_writer == current) |
99 | return; | |
100 | mutex_lock(&mem_hotplug.lock); | |
101 | ||
102 | if (WARN_ON(!mem_hotplug.refcount)) | |
103 | mem_hotplug.refcount++; /* try to fix things up */ | |
104 | ||
105 | if (!--mem_hotplug.refcount && unlikely(mem_hotplug.active_writer)) | |
106 | wake_up_process(mem_hotplug.active_writer); | |
107 | mutex_unlock(&mem_hotplug.lock); | |
108 | memhp_lock_release(); | |
109 | ||
20d6c96b KM |
110 | } |
111 | ||
30467e0b | 112 | void mem_hotplug_begin(void) |
20d6c96b | 113 | { |
bfc8c901 VD |
114 | mem_hotplug.active_writer = current; |
115 | ||
116 | memhp_lock_acquire(); | |
117 | for (;;) { | |
118 | mutex_lock(&mem_hotplug.lock); | |
119 | if (likely(!mem_hotplug.refcount)) | |
120 | break; | |
121 | __set_current_state(TASK_UNINTERRUPTIBLE); | |
122 | mutex_unlock(&mem_hotplug.lock); | |
123 | schedule(); | |
124 | } | |
20d6c96b KM |
125 | } |
126 | ||
30467e0b | 127 | void mem_hotplug_done(void) |
bfc8c901 VD |
128 | { |
129 | mem_hotplug.active_writer = NULL; | |
130 | mutex_unlock(&mem_hotplug.lock); | |
131 | memhp_lock_release(); | |
132 | } | |
20d6c96b | 133 | |
45e0b78b KM |
134 | /* add this memory to iomem resource */ |
135 | static struct resource *register_memory_resource(u64 start, u64 size) | |
136 | { | |
137 | struct resource *res; | |
138 | res = kzalloc(sizeof(struct resource), GFP_KERNEL); | |
6f754ba4 VK |
139 | if (!res) |
140 | return ERR_PTR(-ENOMEM); | |
45e0b78b KM |
141 | |
142 | res->name = "System RAM"; | |
143 | res->start = start; | |
144 | res->end = start + size - 1; | |
782b8664 | 145 | res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; |
45e0b78b | 146 | if (request_resource(&iomem_resource, res) < 0) { |
4996eed8 | 147 | pr_debug("System RAM resource %pR cannot be added\n", res); |
45e0b78b | 148 | kfree(res); |
6f754ba4 | 149 | return ERR_PTR(-EEXIST); |
45e0b78b KM |
150 | } |
151 | return res; | |
152 | } | |
153 | ||
154 | static void release_memory_resource(struct resource *res) | |
155 | { | |
156 | if (!res) | |
157 | return; | |
158 | release_resource(res); | |
159 | kfree(res); | |
160 | return; | |
161 | } | |
162 | ||
53947027 | 163 | #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE |
46723bfa YI |
164 | void get_page_bootmem(unsigned long info, struct page *page, |
165 | unsigned long type) | |
04753278 | 166 | { |
5f24ce5f | 167 | page->lru.next = (struct list_head *) type; |
04753278 YG |
168 | SetPagePrivate(page); |
169 | set_page_private(page, info); | |
fe896d18 | 170 | page_ref_inc(page); |
04753278 YG |
171 | } |
172 | ||
170a5a7e | 173 | void put_page_bootmem(struct page *page) |
04753278 | 174 | { |
5f24ce5f | 175 | unsigned long type; |
04753278 | 176 | |
5f24ce5f AA |
177 | type = (unsigned long) page->lru.next; |
178 | BUG_ON(type < MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE || | |
179 | type > MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE); | |
04753278 | 180 | |
fe896d18 | 181 | if (page_ref_dec_return(page) == 1) { |
04753278 YG |
182 | ClearPagePrivate(page); |
183 | set_page_private(page, 0); | |
5f24ce5f | 184 | INIT_LIST_HEAD(&page->lru); |
170a5a7e | 185 | free_reserved_page(page); |
04753278 | 186 | } |
04753278 YG |
187 | } |
188 | ||
46723bfa YI |
189 | #ifdef CONFIG_HAVE_BOOTMEM_INFO_NODE |
190 | #ifndef CONFIG_SPARSEMEM_VMEMMAP | |
d92bc318 | 191 | static void register_page_bootmem_info_section(unsigned long start_pfn) |
04753278 YG |
192 | { |
193 | unsigned long *usemap, mapsize, section_nr, i; | |
194 | struct mem_section *ms; | |
195 | struct page *page, *memmap; | |
196 | ||
04753278 YG |
197 | section_nr = pfn_to_section_nr(start_pfn); |
198 | ms = __nr_to_section(section_nr); | |
199 | ||
200 | /* Get section's memmap address */ | |
201 | memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); | |
202 | ||
203 | /* | |
204 | * Get page for the memmap's phys address | |
205 | * XXX: need more consideration for sparse_vmemmap... | |
206 | */ | |
207 | page = virt_to_page(memmap); | |
208 | mapsize = sizeof(struct page) * PAGES_PER_SECTION; | |
209 | mapsize = PAGE_ALIGN(mapsize) >> PAGE_SHIFT; | |
210 | ||
211 | /* remember memmap's page */ | |
212 | for (i = 0; i < mapsize; i++, page++) | |
213 | get_page_bootmem(section_nr, page, SECTION_INFO); | |
214 | ||
215 | usemap = __nr_to_section(section_nr)->pageblock_flags; | |
216 | page = virt_to_page(usemap); | |
217 | ||
218 | mapsize = PAGE_ALIGN(usemap_size()) >> PAGE_SHIFT; | |
219 | ||
220 | for (i = 0; i < mapsize; i++, page++) | |
af370fb8 | 221 | get_page_bootmem(section_nr, page, MIX_SECTION_INFO); |
04753278 YG |
222 | |
223 | } | |
46723bfa YI |
224 | #else /* CONFIG_SPARSEMEM_VMEMMAP */ |
225 | static void register_page_bootmem_info_section(unsigned long start_pfn) | |
226 | { | |
227 | unsigned long *usemap, mapsize, section_nr, i; | |
228 | struct mem_section *ms; | |
229 | struct page *page, *memmap; | |
230 | ||
231 | if (!pfn_valid(start_pfn)) | |
232 | return; | |
233 | ||
234 | section_nr = pfn_to_section_nr(start_pfn); | |
235 | ms = __nr_to_section(section_nr); | |
236 | ||
237 | memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); | |
238 | ||
239 | register_page_bootmem_memmap(section_nr, memmap, PAGES_PER_SECTION); | |
240 | ||
241 | usemap = __nr_to_section(section_nr)->pageblock_flags; | |
242 | page = virt_to_page(usemap); | |
243 | ||
244 | mapsize = PAGE_ALIGN(usemap_size()) >> PAGE_SHIFT; | |
245 | ||
246 | for (i = 0; i < mapsize; i++, page++) | |
247 | get_page_bootmem(section_nr, page, MIX_SECTION_INFO); | |
248 | } | |
249 | #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ | |
04753278 YG |
250 | |
251 | void register_page_bootmem_info_node(struct pglist_data *pgdat) | |
252 | { | |
253 | unsigned long i, pfn, end_pfn, nr_pages; | |
254 | int node = pgdat->node_id; | |
255 | struct page *page; | |
256 | struct zone *zone; | |
257 | ||
258 | nr_pages = PAGE_ALIGN(sizeof(struct pglist_data)) >> PAGE_SHIFT; | |
259 | page = virt_to_page(pgdat); | |
260 | ||
261 | for (i = 0; i < nr_pages; i++, page++) | |
262 | get_page_bootmem(node, page, NODE_INFO); | |
263 | ||
264 | zone = &pgdat->node_zones[0]; | |
265 | for (; zone < pgdat->node_zones + MAX_NR_ZONES - 1; zone++) { | |
139c2d75 | 266 | if (zone_is_initialized(zone)) { |
04753278 YG |
267 | nr_pages = zone->wait_table_hash_nr_entries |
268 | * sizeof(wait_queue_head_t); | |
269 | nr_pages = PAGE_ALIGN(nr_pages) >> PAGE_SHIFT; | |
270 | page = virt_to_page(zone->wait_table); | |
271 | ||
272 | for (i = 0; i < nr_pages; i++, page++) | |
273 | get_page_bootmem(node, page, NODE_INFO); | |
274 | } | |
275 | } | |
276 | ||
277 | pfn = pgdat->node_start_pfn; | |
c1f19495 | 278 | end_pfn = pgdat_end_pfn(pgdat); |
04753278 | 279 | |
7e9f5eb0 | 280 | /* register section info */ |
f14851af | 281 | for (; pfn < end_pfn; pfn += PAGES_PER_SECTION) { |
282 | /* | |
283 | * Some platforms can assign the same pfn to multiple nodes - on | |
284 | * node0 as well as nodeN. To avoid registering a pfn against | |
285 | * multiple nodes we check that this pfn does not already | |
7e9f5eb0 | 286 | * reside in some other nodes. |
f14851af | 287 | */ |
288 | if (pfn_valid(pfn) && (pfn_to_nid(pfn) == node)) | |
289 | register_page_bootmem_info_section(pfn); | |
290 | } | |
04753278 | 291 | } |
46723bfa | 292 | #endif /* CONFIG_HAVE_BOOTMEM_INFO_NODE */ |
04753278 | 293 | |
f2765404 FF |
294 | static void __meminit grow_zone_span(struct zone *zone, unsigned long start_pfn, |
295 | unsigned long end_pfn) | |
76cdd58e HC |
296 | { |
297 | unsigned long old_zone_end_pfn; | |
298 | ||
299 | zone_span_writelock(zone); | |
300 | ||
c33bc315 | 301 | old_zone_end_pfn = zone_end_pfn(zone); |
8080fc03 | 302 | if (zone_is_empty(zone) || start_pfn < zone->zone_start_pfn) |
76cdd58e HC |
303 | zone->zone_start_pfn = start_pfn; |
304 | ||
305 | zone->spanned_pages = max(old_zone_end_pfn, end_pfn) - | |
306 | zone->zone_start_pfn; | |
307 | ||
308 | zone_span_writeunlock(zone); | |
309 | } | |
310 | ||
511c2aba LJ |
311 | static void resize_zone(struct zone *zone, unsigned long start_pfn, |
312 | unsigned long end_pfn) | |
313 | { | |
314 | zone_span_writelock(zone); | |
315 | ||
e455a9b9 LJ |
316 | if (end_pfn - start_pfn) { |
317 | zone->zone_start_pfn = start_pfn; | |
318 | zone->spanned_pages = end_pfn - start_pfn; | |
319 | } else { | |
320 | /* | |
321 | * make it consist as free_area_init_core(), | |
322 | * if spanned_pages = 0, then keep start_pfn = 0 | |
323 | */ | |
324 | zone->zone_start_pfn = 0; | |
325 | zone->spanned_pages = 0; | |
326 | } | |
511c2aba LJ |
327 | |
328 | zone_span_writeunlock(zone); | |
329 | } | |
330 | ||
331 | static void fix_zone_id(struct zone *zone, unsigned long start_pfn, | |
332 | unsigned long end_pfn) | |
333 | { | |
334 | enum zone_type zid = zone_idx(zone); | |
335 | int nid = zone->zone_pgdat->node_id; | |
336 | unsigned long pfn; | |
337 | ||
338 | for (pfn = start_pfn; pfn < end_pfn; pfn++) | |
339 | set_page_links(pfn_to_page(pfn), zid, nid, pfn); | |
340 | } | |
341 | ||
f6bbb78e | 342 | /* Can fail with -ENOMEM from allocating a wait table with vmalloc() or |
9e43aa2b | 343 | * alloc_bootmem_node_nopanic()/memblock_virt_alloc_node_nopanic() */ |
f6bbb78e CS |
344 | static int __ref ensure_zone_is_initialized(struct zone *zone, |
345 | unsigned long start_pfn, unsigned long num_pages) | |
346 | { | |
347 | if (!zone_is_initialized(zone)) | |
b171e409 YB |
348 | return init_currently_empty_zone(zone, start_pfn, num_pages); |
349 | ||
f6bbb78e CS |
350 | return 0; |
351 | } | |
352 | ||
e455a9b9 | 353 | static int __meminit move_pfn_range_left(struct zone *z1, struct zone *z2, |
511c2aba LJ |
354 | unsigned long start_pfn, unsigned long end_pfn) |
355 | { | |
e455a9b9 | 356 | int ret; |
511c2aba | 357 | unsigned long flags; |
e455a9b9 LJ |
358 | unsigned long z1_start_pfn; |
359 | ||
64dd1b29 CS |
360 | ret = ensure_zone_is_initialized(z1, start_pfn, end_pfn - start_pfn); |
361 | if (ret) | |
362 | return ret; | |
511c2aba LJ |
363 | |
364 | pgdat_resize_lock(z1->zone_pgdat, &flags); | |
365 | ||
366 | /* can't move pfns which are higher than @z2 */ | |
108bcc96 | 367 | if (end_pfn > zone_end_pfn(z2)) |
511c2aba | 368 | goto out_fail; |
834405c3 | 369 | /* the move out part must be at the left most of @z2 */ |
511c2aba LJ |
370 | if (start_pfn > z2->zone_start_pfn) |
371 | goto out_fail; | |
372 | /* must included/overlap */ | |
373 | if (end_pfn <= z2->zone_start_pfn) | |
374 | goto out_fail; | |
375 | ||
e455a9b9 | 376 | /* use start_pfn for z1's start_pfn if z1 is empty */ |
8080fc03 | 377 | if (!zone_is_empty(z1)) |
e455a9b9 LJ |
378 | z1_start_pfn = z1->zone_start_pfn; |
379 | else | |
380 | z1_start_pfn = start_pfn; | |
381 | ||
382 | resize_zone(z1, z1_start_pfn, end_pfn); | |
108bcc96 | 383 | resize_zone(z2, end_pfn, zone_end_pfn(z2)); |
511c2aba LJ |
384 | |
385 | pgdat_resize_unlock(z1->zone_pgdat, &flags); | |
386 | ||
387 | fix_zone_id(z1, start_pfn, end_pfn); | |
388 | ||
389 | return 0; | |
390 | out_fail: | |
391 | pgdat_resize_unlock(z1->zone_pgdat, &flags); | |
392 | return -1; | |
393 | } | |
394 | ||
e455a9b9 | 395 | static int __meminit move_pfn_range_right(struct zone *z1, struct zone *z2, |
511c2aba LJ |
396 | unsigned long start_pfn, unsigned long end_pfn) |
397 | { | |
e455a9b9 | 398 | int ret; |
511c2aba | 399 | unsigned long flags; |
e455a9b9 LJ |
400 | unsigned long z2_end_pfn; |
401 | ||
64dd1b29 CS |
402 | ret = ensure_zone_is_initialized(z2, start_pfn, end_pfn - start_pfn); |
403 | if (ret) | |
404 | return ret; | |
511c2aba LJ |
405 | |
406 | pgdat_resize_lock(z1->zone_pgdat, &flags); | |
407 | ||
408 | /* can't move pfns which are lower than @z1 */ | |
409 | if (z1->zone_start_pfn > start_pfn) | |
410 | goto out_fail; | |
411 | /* the move out part mast at the right most of @z1 */ | |
108bcc96 | 412 | if (zone_end_pfn(z1) > end_pfn) |
511c2aba LJ |
413 | goto out_fail; |
414 | /* must included/overlap */ | |
108bcc96 | 415 | if (start_pfn >= zone_end_pfn(z1)) |
511c2aba LJ |
416 | goto out_fail; |
417 | ||
e455a9b9 | 418 | /* use end_pfn for z2's end_pfn if z2 is empty */ |
8080fc03 | 419 | if (!zone_is_empty(z2)) |
108bcc96 | 420 | z2_end_pfn = zone_end_pfn(z2); |
e455a9b9 LJ |
421 | else |
422 | z2_end_pfn = end_pfn; | |
423 | ||
511c2aba | 424 | resize_zone(z1, z1->zone_start_pfn, start_pfn); |
e455a9b9 | 425 | resize_zone(z2, start_pfn, z2_end_pfn); |
511c2aba LJ |
426 | |
427 | pgdat_resize_unlock(z1->zone_pgdat, &flags); | |
428 | ||
429 | fix_zone_id(z2, start_pfn, end_pfn); | |
430 | ||
431 | return 0; | |
432 | out_fail: | |
433 | pgdat_resize_unlock(z1->zone_pgdat, &flags); | |
434 | return -1; | |
435 | } | |
436 | ||
f2765404 FF |
437 | static void __meminit grow_pgdat_span(struct pglist_data *pgdat, unsigned long start_pfn, |
438 | unsigned long end_pfn) | |
76cdd58e | 439 | { |
83285c72 | 440 | unsigned long old_pgdat_end_pfn = pgdat_end_pfn(pgdat); |
76cdd58e | 441 | |
712cd386 | 442 | if (!pgdat->node_spanned_pages || start_pfn < pgdat->node_start_pfn) |
76cdd58e HC |
443 | pgdat->node_start_pfn = start_pfn; |
444 | ||
445 | pgdat->node_spanned_pages = max(old_pgdat_end_pfn, end_pfn) - | |
446 | pgdat->node_start_pfn; | |
447 | } | |
448 | ||
31168481 | 449 | static int __meminit __add_zone(struct zone *zone, unsigned long phys_start_pfn) |
3947be19 DH |
450 | { |
451 | struct pglist_data *pgdat = zone->zone_pgdat; | |
452 | int nr_pages = PAGES_PER_SECTION; | |
453 | int nid = pgdat->node_id; | |
454 | int zone_type; | |
e298ff75 | 455 | unsigned long flags, pfn; |
64dd1b29 | 456 | int ret; |
3947be19 DH |
457 | |
458 | zone_type = zone - pgdat->node_zones; | |
64dd1b29 CS |
459 | ret = ensure_zone_is_initialized(zone, phys_start_pfn, nr_pages); |
460 | if (ret) | |
461 | return ret; | |
76cdd58e | 462 | |
76cdd58e HC |
463 | pgdat_resize_lock(zone->zone_pgdat, &flags); |
464 | grow_zone_span(zone, phys_start_pfn, phys_start_pfn + nr_pages); | |
465 | grow_pgdat_span(zone->zone_pgdat, phys_start_pfn, | |
466 | phys_start_pfn + nr_pages); | |
467 | pgdat_resize_unlock(zone->zone_pgdat, &flags); | |
a2f3aa02 DH |
468 | memmap_init_zone(nr_pages, nid, zone_type, |
469 | phys_start_pfn, MEMMAP_HOTPLUG); | |
e298ff75 MG |
470 | |
471 | /* online_page_range is called later and expects pages reserved */ | |
472 | for (pfn = phys_start_pfn; pfn < phys_start_pfn + nr_pages; pfn++) { | |
473 | if (!pfn_valid(pfn)) | |
474 | continue; | |
475 | ||
476 | SetPageReserved(pfn_to_page(pfn)); | |
477 | } | |
718127cc | 478 | return 0; |
3947be19 DH |
479 | } |
480 | ||
c04fc586 GH |
481 | static int __meminit __add_section(int nid, struct zone *zone, |
482 | unsigned long phys_start_pfn) | |
3947be19 | 483 | { |
3947be19 DH |
484 | int ret; |
485 | ||
ebd15302 KH |
486 | if (pfn_valid(phys_start_pfn)) |
487 | return -EEXIST; | |
488 | ||
85b35fea | 489 | ret = sparse_add_one_section(zone, phys_start_pfn); |
3947be19 DH |
490 | |
491 | if (ret < 0) | |
492 | return ret; | |
493 | ||
718127cc YG |
494 | ret = __add_zone(zone, phys_start_pfn); |
495 | ||
496 | if (ret < 0) | |
497 | return ret; | |
498 | ||
c04fc586 | 499 | return register_new_memory(nid, __pfn_to_section(phys_start_pfn)); |
3947be19 DH |
500 | } |
501 | ||
4edd7cef DR |
502 | /* |
503 | * Reasonably generic function for adding memory. It is | |
504 | * expected that archs that support memory hotplug will | |
505 | * call this function after deciding the zone to which to | |
506 | * add the new pages. | |
507 | */ | |
508 | int __ref __add_pages(int nid, struct zone *zone, unsigned long phys_start_pfn, | |
509 | unsigned long nr_pages) | |
510 | { | |
511 | unsigned long i; | |
512 | int err = 0; | |
513 | int start_sec, end_sec; | |
4b94ffdc DW |
514 | struct vmem_altmap *altmap; |
515 | ||
7cf91a98 JK |
516 | clear_zone_contiguous(zone); |
517 | ||
4edd7cef DR |
518 | /* during initialize mem_map, align hot-added range to section */ |
519 | start_sec = pfn_to_section_nr(phys_start_pfn); | |
520 | end_sec = pfn_to_section_nr(phys_start_pfn + nr_pages - 1); | |
521 | ||
4b94ffdc DW |
522 | altmap = to_vmem_altmap((unsigned long) pfn_to_page(phys_start_pfn)); |
523 | if (altmap) { | |
524 | /* | |
525 | * Validate altmap is within bounds of the total request | |
526 | */ | |
527 | if (altmap->base_pfn != phys_start_pfn | |
528 | || vmem_altmap_offset(altmap) > nr_pages) { | |
529 | pr_warn_once("memory add fail, invalid altmap\n"); | |
7cf91a98 JK |
530 | err = -EINVAL; |
531 | goto out; | |
4b94ffdc DW |
532 | } |
533 | altmap->alloc = 0; | |
534 | } | |
535 | ||
4edd7cef | 536 | for (i = start_sec; i <= end_sec; i++) { |
19c07d5e | 537 | err = __add_section(nid, zone, section_nr_to_pfn(i)); |
4edd7cef DR |
538 | |
539 | /* | |
540 | * EEXIST is finally dealt with by ioresource collision | |
541 | * check. see add_memory() => register_memory_resource() | |
542 | * Warning will be printed if there is collision. | |
543 | */ | |
544 | if (err && (err != -EEXIST)) | |
545 | break; | |
546 | err = 0; | |
547 | } | |
c435a390 | 548 | vmemmap_populate_print_last(); |
7cf91a98 JK |
549 | out: |
550 | set_zone_contiguous(zone); | |
4edd7cef DR |
551 | return err; |
552 | } | |
553 | EXPORT_SYMBOL_GPL(__add_pages); | |
554 | ||
555 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
815121d2 YI |
556 | /* find the smallest valid pfn in the range [start_pfn, end_pfn) */ |
557 | static int find_smallest_section_pfn(int nid, struct zone *zone, | |
558 | unsigned long start_pfn, | |
559 | unsigned long end_pfn) | |
560 | { | |
561 | struct mem_section *ms; | |
562 | ||
563 | for (; start_pfn < end_pfn; start_pfn += PAGES_PER_SECTION) { | |
564 | ms = __pfn_to_section(start_pfn); | |
565 | ||
566 | if (unlikely(!valid_section(ms))) | |
567 | continue; | |
568 | ||
569 | if (unlikely(pfn_to_nid(start_pfn) != nid)) | |
570 | continue; | |
571 | ||
572 | if (zone && zone != page_zone(pfn_to_page(start_pfn))) | |
573 | continue; | |
574 | ||
575 | return start_pfn; | |
576 | } | |
577 | ||
578 | return 0; | |
579 | } | |
580 | ||
581 | /* find the biggest valid pfn in the range [start_pfn, end_pfn). */ | |
582 | static int find_biggest_section_pfn(int nid, struct zone *zone, | |
583 | unsigned long start_pfn, | |
584 | unsigned long end_pfn) | |
585 | { | |
586 | struct mem_section *ms; | |
587 | unsigned long pfn; | |
588 | ||
589 | /* pfn is the end pfn of a memory section. */ | |
590 | pfn = end_pfn - 1; | |
591 | for (; pfn >= start_pfn; pfn -= PAGES_PER_SECTION) { | |
592 | ms = __pfn_to_section(pfn); | |
593 | ||
594 | if (unlikely(!valid_section(ms))) | |
595 | continue; | |
596 | ||
597 | if (unlikely(pfn_to_nid(pfn) != nid)) | |
598 | continue; | |
599 | ||
600 | if (zone && zone != page_zone(pfn_to_page(pfn))) | |
601 | continue; | |
602 | ||
603 | return pfn; | |
604 | } | |
605 | ||
606 | return 0; | |
607 | } | |
608 | ||
609 | static void shrink_zone_span(struct zone *zone, unsigned long start_pfn, | |
610 | unsigned long end_pfn) | |
611 | { | |
c33bc315 XQ |
612 | unsigned long zone_start_pfn = zone->zone_start_pfn; |
613 | unsigned long z = zone_end_pfn(zone); /* zone_end_pfn namespace clash */ | |
614 | unsigned long zone_end_pfn = z; | |
815121d2 YI |
615 | unsigned long pfn; |
616 | struct mem_section *ms; | |
617 | int nid = zone_to_nid(zone); | |
618 | ||
619 | zone_span_writelock(zone); | |
620 | if (zone_start_pfn == start_pfn) { | |
621 | /* | |
622 | * If the section is smallest section in the zone, it need | |
623 | * shrink zone->zone_start_pfn and zone->zone_spanned_pages. | |
624 | * In this case, we find second smallest valid mem_section | |
625 | * for shrinking zone. | |
626 | */ | |
627 | pfn = find_smallest_section_pfn(nid, zone, end_pfn, | |
628 | zone_end_pfn); | |
629 | if (pfn) { | |
630 | zone->zone_start_pfn = pfn; | |
631 | zone->spanned_pages = zone_end_pfn - pfn; | |
632 | } | |
633 | } else if (zone_end_pfn == end_pfn) { | |
634 | /* | |
635 | * If the section is biggest section in the zone, it need | |
636 | * shrink zone->spanned_pages. | |
637 | * In this case, we find second biggest valid mem_section for | |
638 | * shrinking zone. | |
639 | */ | |
640 | pfn = find_biggest_section_pfn(nid, zone, zone_start_pfn, | |
641 | start_pfn); | |
642 | if (pfn) | |
643 | zone->spanned_pages = pfn - zone_start_pfn + 1; | |
644 | } | |
645 | ||
646 | /* | |
647 | * The section is not biggest or smallest mem_section in the zone, it | |
648 | * only creates a hole in the zone. So in this case, we need not | |
649 | * change the zone. But perhaps, the zone has only hole data. Thus | |
650 | * it check the zone has only hole or not. | |
651 | */ | |
652 | pfn = zone_start_pfn; | |
653 | for (; pfn < zone_end_pfn; pfn += PAGES_PER_SECTION) { | |
654 | ms = __pfn_to_section(pfn); | |
655 | ||
656 | if (unlikely(!valid_section(ms))) | |
657 | continue; | |
658 | ||
659 | if (page_zone(pfn_to_page(pfn)) != zone) | |
660 | continue; | |
661 | ||
662 | /* If the section is current section, it continues the loop */ | |
663 | if (start_pfn == pfn) | |
664 | continue; | |
665 | ||
666 | /* If we find valid section, we have nothing to do */ | |
667 | zone_span_writeunlock(zone); | |
668 | return; | |
669 | } | |
670 | ||
671 | /* The zone has no valid section */ | |
672 | zone->zone_start_pfn = 0; | |
673 | zone->spanned_pages = 0; | |
674 | zone_span_writeunlock(zone); | |
675 | } | |
676 | ||
677 | static void shrink_pgdat_span(struct pglist_data *pgdat, | |
678 | unsigned long start_pfn, unsigned long end_pfn) | |
679 | { | |
83285c72 XQ |
680 | unsigned long pgdat_start_pfn = pgdat->node_start_pfn; |
681 | unsigned long p = pgdat_end_pfn(pgdat); /* pgdat_end_pfn namespace clash */ | |
682 | unsigned long pgdat_end_pfn = p; | |
815121d2 YI |
683 | unsigned long pfn; |
684 | struct mem_section *ms; | |
685 | int nid = pgdat->node_id; | |
686 | ||
687 | if (pgdat_start_pfn == start_pfn) { | |
688 | /* | |
689 | * If the section is smallest section in the pgdat, it need | |
690 | * shrink pgdat->node_start_pfn and pgdat->node_spanned_pages. | |
691 | * In this case, we find second smallest valid mem_section | |
692 | * for shrinking zone. | |
693 | */ | |
694 | pfn = find_smallest_section_pfn(nid, NULL, end_pfn, | |
695 | pgdat_end_pfn); | |
696 | if (pfn) { | |
697 | pgdat->node_start_pfn = pfn; | |
698 | pgdat->node_spanned_pages = pgdat_end_pfn - pfn; | |
699 | } | |
700 | } else if (pgdat_end_pfn == end_pfn) { | |
701 | /* | |
702 | * If the section is biggest section in the pgdat, it need | |
703 | * shrink pgdat->node_spanned_pages. | |
704 | * In this case, we find second biggest valid mem_section for | |
705 | * shrinking zone. | |
706 | */ | |
707 | pfn = find_biggest_section_pfn(nid, NULL, pgdat_start_pfn, | |
708 | start_pfn); | |
709 | if (pfn) | |
710 | pgdat->node_spanned_pages = pfn - pgdat_start_pfn + 1; | |
711 | } | |
712 | ||
713 | /* | |
714 | * If the section is not biggest or smallest mem_section in the pgdat, | |
715 | * it only creates a hole in the pgdat. So in this case, we need not | |
716 | * change the pgdat. | |
717 | * But perhaps, the pgdat has only hole data. Thus it check the pgdat | |
718 | * has only hole or not. | |
719 | */ | |
720 | pfn = pgdat_start_pfn; | |
721 | for (; pfn < pgdat_end_pfn; pfn += PAGES_PER_SECTION) { | |
722 | ms = __pfn_to_section(pfn); | |
723 | ||
724 | if (unlikely(!valid_section(ms))) | |
725 | continue; | |
726 | ||
727 | if (pfn_to_nid(pfn) != nid) | |
728 | continue; | |
729 | ||
730 | /* If the section is current section, it continues the loop */ | |
731 | if (start_pfn == pfn) | |
732 | continue; | |
733 | ||
734 | /* If we find valid section, we have nothing to do */ | |
735 | return; | |
736 | } | |
737 | ||
738 | /* The pgdat has no valid section */ | |
739 | pgdat->node_start_pfn = 0; | |
740 | pgdat->node_spanned_pages = 0; | |
741 | } | |
742 | ||
743 | static void __remove_zone(struct zone *zone, unsigned long start_pfn) | |
744 | { | |
745 | struct pglist_data *pgdat = zone->zone_pgdat; | |
746 | int nr_pages = PAGES_PER_SECTION; | |
747 | int zone_type; | |
748 | unsigned long flags; | |
749 | ||
750 | zone_type = zone - pgdat->node_zones; | |
751 | ||
752 | pgdat_resize_lock(zone->zone_pgdat, &flags); | |
753 | shrink_zone_span(zone, start_pfn, start_pfn + nr_pages); | |
754 | shrink_pgdat_span(pgdat, start_pfn, start_pfn + nr_pages); | |
755 | pgdat_resize_unlock(zone->zone_pgdat, &flags); | |
756 | } | |
757 | ||
4b94ffdc DW |
758 | static int __remove_section(struct zone *zone, struct mem_section *ms, |
759 | unsigned long map_offset) | |
ea01ea93 | 760 | { |
815121d2 YI |
761 | unsigned long start_pfn; |
762 | int scn_nr; | |
ea01ea93 BP |
763 | int ret = -EINVAL; |
764 | ||
765 | if (!valid_section(ms)) | |
766 | return ret; | |
767 | ||
768 | ret = unregister_memory_section(ms); | |
769 | if (ret) | |
770 | return ret; | |
771 | ||
815121d2 YI |
772 | scn_nr = __section_nr(ms); |
773 | start_pfn = section_nr_to_pfn(scn_nr); | |
774 | __remove_zone(zone, start_pfn); | |
775 | ||
4b94ffdc | 776 | sparse_remove_one_section(zone, ms, map_offset); |
ea01ea93 BP |
777 | return 0; |
778 | } | |
779 | ||
ea01ea93 BP |
780 | /** |
781 | * __remove_pages() - remove sections of pages from a zone | |
782 | * @zone: zone from which pages need to be removed | |
783 | * @phys_start_pfn: starting pageframe (must be aligned to start of a section) | |
784 | * @nr_pages: number of pages to remove (must be multiple of section size) | |
785 | * | |
786 | * Generic helper function to remove section mappings and sysfs entries | |
787 | * for the section of the memory we are removing. Caller needs to make | |
788 | * sure that pages are marked reserved and zones are adjust properly by | |
789 | * calling offline_pages(). | |
790 | */ | |
791 | int __remove_pages(struct zone *zone, unsigned long phys_start_pfn, | |
792 | unsigned long nr_pages) | |
793 | { | |
fe74ebb1 | 794 | unsigned long i; |
4b94ffdc DW |
795 | unsigned long map_offset = 0; |
796 | int sections_to_remove, ret = 0; | |
797 | ||
798 | /* In the ZONE_DEVICE case device driver owns the memory region */ | |
799 | if (is_dev_zone(zone)) { | |
800 | struct page *page = pfn_to_page(phys_start_pfn); | |
801 | struct vmem_altmap *altmap; | |
802 | ||
803 | altmap = to_vmem_altmap((unsigned long) page); | |
804 | if (altmap) | |
805 | map_offset = vmem_altmap_offset(altmap); | |
806 | } else { | |
807 | resource_size_t start, size; | |
808 | ||
809 | start = phys_start_pfn << PAGE_SHIFT; | |
810 | size = nr_pages * PAGE_SIZE; | |
811 | ||
812 | ret = release_mem_region_adjustable(&iomem_resource, start, | |
813 | size); | |
814 | if (ret) { | |
815 | resource_size_t endres = start + size - 1; | |
816 | ||
817 | pr_warn("Unable to release resource <%pa-%pa> (%d)\n", | |
818 | &start, &endres, ret); | |
819 | } | |
820 | } | |
ea01ea93 | 821 | |
7cf91a98 JK |
822 | clear_zone_contiguous(zone); |
823 | ||
ea01ea93 BP |
824 | /* |
825 | * We can only remove entire sections | |
826 | */ | |
827 | BUG_ON(phys_start_pfn & ~PAGE_SECTION_MASK); | |
828 | BUG_ON(nr_pages % PAGES_PER_SECTION); | |
829 | ||
ea01ea93 BP |
830 | sections_to_remove = nr_pages / PAGES_PER_SECTION; |
831 | for (i = 0; i < sections_to_remove; i++) { | |
832 | unsigned long pfn = phys_start_pfn + i*PAGES_PER_SECTION; | |
4b94ffdc DW |
833 | |
834 | ret = __remove_section(zone, __pfn_to_section(pfn), map_offset); | |
835 | map_offset = 0; | |
ea01ea93 BP |
836 | if (ret) |
837 | break; | |
838 | } | |
7cf91a98 JK |
839 | |
840 | set_zone_contiguous(zone); | |
841 | ||
ea01ea93 BP |
842 | return ret; |
843 | } | |
844 | EXPORT_SYMBOL_GPL(__remove_pages); | |
4edd7cef | 845 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
ea01ea93 | 846 | |
9d0ad8ca DK |
847 | int set_online_page_callback(online_page_callback_t callback) |
848 | { | |
849 | int rc = -EINVAL; | |
850 | ||
bfc8c901 VD |
851 | get_online_mems(); |
852 | mutex_lock(&online_page_callback_lock); | |
9d0ad8ca DK |
853 | |
854 | if (online_page_callback == generic_online_page) { | |
855 | online_page_callback = callback; | |
856 | rc = 0; | |
857 | } | |
858 | ||
bfc8c901 VD |
859 | mutex_unlock(&online_page_callback_lock); |
860 | put_online_mems(); | |
9d0ad8ca DK |
861 | |
862 | return rc; | |
863 | } | |
864 | EXPORT_SYMBOL_GPL(set_online_page_callback); | |
865 | ||
866 | int restore_online_page_callback(online_page_callback_t callback) | |
867 | { | |
868 | int rc = -EINVAL; | |
869 | ||
bfc8c901 VD |
870 | get_online_mems(); |
871 | mutex_lock(&online_page_callback_lock); | |
9d0ad8ca DK |
872 | |
873 | if (online_page_callback == callback) { | |
874 | online_page_callback = generic_online_page; | |
875 | rc = 0; | |
876 | } | |
877 | ||
bfc8c901 VD |
878 | mutex_unlock(&online_page_callback_lock); |
879 | put_online_mems(); | |
9d0ad8ca DK |
880 | |
881 | return rc; | |
882 | } | |
883 | EXPORT_SYMBOL_GPL(restore_online_page_callback); | |
884 | ||
885 | void __online_page_set_limits(struct page *page) | |
180c06ef | 886 | { |
9d0ad8ca DK |
887 | } |
888 | EXPORT_SYMBOL_GPL(__online_page_set_limits); | |
889 | ||
890 | void __online_page_increment_counters(struct page *page) | |
891 | { | |
3dcc0571 | 892 | adjust_managed_page_count(page, 1); |
9d0ad8ca DK |
893 | } |
894 | EXPORT_SYMBOL_GPL(__online_page_increment_counters); | |
180c06ef | 895 | |
9d0ad8ca DK |
896 | void __online_page_free(struct page *page) |
897 | { | |
3dcc0571 | 898 | __free_reserved_page(page); |
180c06ef | 899 | } |
9d0ad8ca DK |
900 | EXPORT_SYMBOL_GPL(__online_page_free); |
901 | ||
902 | static void generic_online_page(struct page *page) | |
903 | { | |
904 | __online_page_set_limits(page); | |
905 | __online_page_increment_counters(page); | |
906 | __online_page_free(page); | |
907 | } | |
180c06ef | 908 | |
75884fb1 KH |
909 | static int online_pages_range(unsigned long start_pfn, unsigned long nr_pages, |
910 | void *arg) | |
3947be19 DH |
911 | { |
912 | unsigned long i; | |
75884fb1 KH |
913 | unsigned long onlined_pages = *(unsigned long *)arg; |
914 | struct page *page; | |
915 | if (PageReserved(pfn_to_page(start_pfn))) | |
916 | for (i = 0; i < nr_pages; i++) { | |
917 | page = pfn_to_page(start_pfn + i); | |
9d0ad8ca | 918 | (*online_page_callback)(page); |
75884fb1 KH |
919 | onlined_pages++; |
920 | } | |
921 | *(unsigned long *)arg = onlined_pages; | |
922 | return 0; | |
923 | } | |
924 | ||
09285af7 | 925 | #ifdef CONFIG_MOVABLE_NODE |
79a4dcef TC |
926 | /* |
927 | * When CONFIG_MOVABLE_NODE, we permit onlining of a node which doesn't have | |
928 | * normal memory. | |
929 | */ | |
09285af7 LJ |
930 | static bool can_online_high_movable(struct zone *zone) |
931 | { | |
932 | return true; | |
933 | } | |
79a4dcef | 934 | #else /* CONFIG_MOVABLE_NODE */ |
74d42d8f LJ |
935 | /* ensure every online node has NORMAL memory */ |
936 | static bool can_online_high_movable(struct zone *zone) | |
937 | { | |
938 | return node_state(zone_to_nid(zone), N_NORMAL_MEMORY); | |
939 | } | |
79a4dcef | 940 | #endif /* CONFIG_MOVABLE_NODE */ |
74d42d8f | 941 | |
d9713679 LJ |
942 | /* check which state of node_states will be changed when online memory */ |
943 | static void node_states_check_changes_online(unsigned long nr_pages, | |
944 | struct zone *zone, struct memory_notify *arg) | |
945 | { | |
946 | int nid = zone_to_nid(zone); | |
947 | enum zone_type zone_last = ZONE_NORMAL; | |
948 | ||
949 | /* | |
6715ddf9 LJ |
950 | * If we have HIGHMEM or movable node, node_states[N_NORMAL_MEMORY] |
951 | * contains nodes which have zones of 0...ZONE_NORMAL, | |
952 | * set zone_last to ZONE_NORMAL. | |
d9713679 | 953 | * |
6715ddf9 LJ |
954 | * If we don't have HIGHMEM nor movable node, |
955 | * node_states[N_NORMAL_MEMORY] contains nodes which have zones of | |
956 | * 0...ZONE_MOVABLE, set zone_last to ZONE_MOVABLE. | |
d9713679 | 957 | */ |
6715ddf9 | 958 | if (N_MEMORY == N_NORMAL_MEMORY) |
d9713679 LJ |
959 | zone_last = ZONE_MOVABLE; |
960 | ||
961 | /* | |
962 | * if the memory to be online is in a zone of 0...zone_last, and | |
963 | * the zones of 0...zone_last don't have memory before online, we will | |
964 | * need to set the node to node_states[N_NORMAL_MEMORY] after | |
965 | * the memory is online. | |
966 | */ | |
967 | if (zone_idx(zone) <= zone_last && !node_state(nid, N_NORMAL_MEMORY)) | |
968 | arg->status_change_nid_normal = nid; | |
969 | else | |
970 | arg->status_change_nid_normal = -1; | |
971 | ||
6715ddf9 LJ |
972 | #ifdef CONFIG_HIGHMEM |
973 | /* | |
974 | * If we have movable node, node_states[N_HIGH_MEMORY] | |
975 | * contains nodes which have zones of 0...ZONE_HIGHMEM, | |
976 | * set zone_last to ZONE_HIGHMEM. | |
977 | * | |
978 | * If we don't have movable node, node_states[N_NORMAL_MEMORY] | |
979 | * contains nodes which have zones of 0...ZONE_MOVABLE, | |
980 | * set zone_last to ZONE_MOVABLE. | |
981 | */ | |
982 | zone_last = ZONE_HIGHMEM; | |
983 | if (N_MEMORY == N_HIGH_MEMORY) | |
984 | zone_last = ZONE_MOVABLE; | |
985 | ||
986 | if (zone_idx(zone) <= zone_last && !node_state(nid, N_HIGH_MEMORY)) | |
987 | arg->status_change_nid_high = nid; | |
988 | else | |
989 | arg->status_change_nid_high = -1; | |
990 | #else | |
991 | arg->status_change_nid_high = arg->status_change_nid_normal; | |
992 | #endif | |
993 | ||
d9713679 LJ |
994 | /* |
995 | * if the node don't have memory befor online, we will need to | |
6715ddf9 | 996 | * set the node to node_states[N_MEMORY] after the memory |
d9713679 LJ |
997 | * is online. |
998 | */ | |
6715ddf9 | 999 | if (!node_state(nid, N_MEMORY)) |
d9713679 LJ |
1000 | arg->status_change_nid = nid; |
1001 | else | |
1002 | arg->status_change_nid = -1; | |
1003 | } | |
1004 | ||
1005 | static void node_states_set_node(int node, struct memory_notify *arg) | |
1006 | { | |
1007 | if (arg->status_change_nid_normal >= 0) | |
1008 | node_set_state(node, N_NORMAL_MEMORY); | |
1009 | ||
6715ddf9 LJ |
1010 | if (arg->status_change_nid_high >= 0) |
1011 | node_set_state(node, N_HIGH_MEMORY); | |
1012 | ||
1013 | node_set_state(node, N_MEMORY); | |
d9713679 LJ |
1014 | } |
1015 | ||
75884fb1 | 1016 | |
30467e0b | 1017 | /* Must be protected by mem_hotplug_begin() */ |
511c2aba | 1018 | int __ref online_pages(unsigned long pfn, unsigned long nr_pages, int online_type) |
75884fb1 | 1019 | { |
aa47228a | 1020 | unsigned long flags; |
3947be19 DH |
1021 | unsigned long onlined_pages = 0; |
1022 | struct zone *zone; | |
6811378e | 1023 | int need_zonelists_rebuild = 0; |
7b78d335 YG |
1024 | int nid; |
1025 | int ret; | |
1026 | struct memory_notify arg; | |
1027 | ||
d9713679 LJ |
1028 | /* |
1029 | * This doesn't need a lock to do pfn_to_page(). | |
1030 | * The section can't be removed here because of the | |
1031 | * memory_block->state_mutex. | |
1032 | */ | |
1033 | zone = page_zone(pfn_to_page(pfn)); | |
1034 | ||
4f7c6b49 TC |
1035 | if ((zone_idx(zone) > ZONE_NORMAL || |
1036 | online_type == MMOP_ONLINE_MOVABLE) && | |
bfc8c901 | 1037 | !can_online_high_movable(zone)) |
30467e0b | 1038 | return -EINVAL; |
74d42d8f | 1039 | |
4f7c6b49 TC |
1040 | if (online_type == MMOP_ONLINE_KERNEL && |
1041 | zone_idx(zone) == ZONE_MOVABLE) { | |
bfc8c901 | 1042 | if (move_pfn_range_left(zone - 1, zone, pfn, pfn + nr_pages)) |
30467e0b | 1043 | return -EINVAL; |
511c2aba | 1044 | } |
4f7c6b49 TC |
1045 | if (online_type == MMOP_ONLINE_MOVABLE && |
1046 | zone_idx(zone) == ZONE_MOVABLE - 1) { | |
bfc8c901 | 1047 | if (move_pfn_range_right(zone, zone + 1, pfn, pfn + nr_pages)) |
30467e0b | 1048 | return -EINVAL; |
511c2aba LJ |
1049 | } |
1050 | ||
1051 | /* Previous code may changed the zone of the pfn range */ | |
1052 | zone = page_zone(pfn_to_page(pfn)); | |
1053 | ||
7b78d335 YG |
1054 | arg.start_pfn = pfn; |
1055 | arg.nr_pages = nr_pages; | |
d9713679 | 1056 | node_states_check_changes_online(nr_pages, zone, &arg); |
7b78d335 | 1057 | |
e888ca35 | 1058 | nid = zone_to_nid(zone); |
3947be19 | 1059 | |
7b78d335 YG |
1060 | ret = memory_notify(MEM_GOING_ONLINE, &arg); |
1061 | ret = notifier_to_errno(ret); | |
e33e33b4 CY |
1062 | if (ret) |
1063 | goto failed_addition; | |
1064 | ||
6811378e YG |
1065 | /* |
1066 | * If this zone is not populated, then it is not in zonelist. | |
1067 | * This means the page allocator ignores this zone. | |
1068 | * So, zonelist must be updated after online. | |
1069 | */ | |
4eaf3f64 | 1070 | mutex_lock(&zonelists_mutex); |
6dcd73d7 | 1071 | if (!populated_zone(zone)) { |
6811378e | 1072 | need_zonelists_rebuild = 1; |
6dcd73d7 WC |
1073 | build_all_zonelists(NULL, zone); |
1074 | } | |
6811378e | 1075 | |
908eedc6 | 1076 | ret = walk_system_ram_range(pfn, nr_pages, &onlined_pages, |
75884fb1 | 1077 | online_pages_range); |
fd8a4221 | 1078 | if (ret) { |
6dcd73d7 WC |
1079 | if (need_zonelists_rebuild) |
1080 | zone_pcp_reset(zone); | |
4eaf3f64 | 1081 | mutex_unlock(&zonelists_mutex); |
e33e33b4 | 1082 | goto failed_addition; |
fd8a4221 GL |
1083 | } |
1084 | ||
3947be19 | 1085 | zone->present_pages += onlined_pages; |
aa47228a CS |
1086 | |
1087 | pgdat_resize_lock(zone->zone_pgdat, &flags); | |
f2937be5 | 1088 | zone->zone_pgdat->node_present_pages += onlined_pages; |
aa47228a CS |
1089 | pgdat_resize_unlock(zone->zone_pgdat, &flags); |
1090 | ||
08dff7b7 | 1091 | if (onlined_pages) { |
e888ca35 | 1092 | node_states_set_node(nid, &arg); |
08dff7b7 | 1093 | if (need_zonelists_rebuild) |
6dcd73d7 | 1094 | build_all_zonelists(NULL, NULL); |
08dff7b7 JL |
1095 | else |
1096 | zone_pcp_update(zone); | |
1097 | } | |
3947be19 | 1098 | |
4eaf3f64 | 1099 | mutex_unlock(&zonelists_mutex); |
1b79acc9 KM |
1100 | |
1101 | init_per_zone_wmark_min(); | |
1102 | ||
698b1b30 | 1103 | if (onlined_pages) { |
e888ca35 | 1104 | kswapd_run(nid); |
698b1b30 VB |
1105 | kcompactd_run(nid); |
1106 | } | |
61b13993 | 1107 | |
1f522509 | 1108 | vm_total_pages = nr_free_pagecache_pages(); |
2f7f24ec | 1109 | |
2d1d43f6 | 1110 | writeback_set_ratelimit(); |
7b78d335 YG |
1111 | |
1112 | if (onlined_pages) | |
1113 | memory_notify(MEM_ONLINE, &arg); | |
30467e0b | 1114 | return 0; |
e33e33b4 CY |
1115 | |
1116 | failed_addition: | |
1117 | pr_debug("online_pages [mem %#010llx-%#010llx] failed\n", | |
1118 | (unsigned long long) pfn << PAGE_SHIFT, | |
1119 | (((unsigned long long) pfn + nr_pages) << PAGE_SHIFT) - 1); | |
1120 | memory_notify(MEM_CANCEL_ONLINE, &arg); | |
1121 | return ret; | |
3947be19 | 1122 | } |
53947027 | 1123 | #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ |
bc02af93 | 1124 | |
0bd85420 TC |
1125 | static void reset_node_present_pages(pg_data_t *pgdat) |
1126 | { | |
1127 | struct zone *z; | |
1128 | ||
1129 | for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++) | |
1130 | z->present_pages = 0; | |
1131 | ||
1132 | pgdat->node_present_pages = 0; | |
1133 | } | |
1134 | ||
e1319331 HS |
1135 | /* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */ |
1136 | static pg_data_t __ref *hotadd_new_pgdat(int nid, u64 start) | |
9af3c2de YG |
1137 | { |
1138 | struct pglist_data *pgdat; | |
1139 | unsigned long zones_size[MAX_NR_ZONES] = {0}; | |
1140 | unsigned long zholes_size[MAX_NR_ZONES] = {0}; | |
c8e861a5 | 1141 | unsigned long start_pfn = PFN_DOWN(start); |
9af3c2de | 1142 | |
a1e565aa TC |
1143 | pgdat = NODE_DATA(nid); |
1144 | if (!pgdat) { | |
1145 | pgdat = arch_alloc_nodedata(nid); | |
1146 | if (!pgdat) | |
1147 | return NULL; | |
9af3c2de | 1148 | |
a1e565aa | 1149 | arch_refresh_nodedata(nid, pgdat); |
b0dc3a34 GZ |
1150 | } else { |
1151 | /* Reset the nr_zones and classzone_idx to 0 before reuse */ | |
1152 | pgdat->nr_zones = 0; | |
1153 | pgdat->classzone_idx = 0; | |
a1e565aa | 1154 | } |
9af3c2de YG |
1155 | |
1156 | /* we can use NODE_DATA(nid) from here */ | |
1157 | ||
1158 | /* init node's zones as empty zones, we don't have any present pages.*/ | |
9109fb7b | 1159 | free_area_init_node(nid, zones_size, start_pfn, zholes_size); |
9af3c2de | 1160 | |
959ecc48 KH |
1161 | /* |
1162 | * The node we allocated has no zone fallback lists. For avoiding | |
1163 | * to access not-initialized zonelist, build here. | |
1164 | */ | |
f957db4f | 1165 | mutex_lock(&zonelists_mutex); |
9adb62a5 | 1166 | build_all_zonelists(pgdat, NULL); |
f957db4f | 1167 | mutex_unlock(&zonelists_mutex); |
959ecc48 | 1168 | |
f784a3f1 TC |
1169 | /* |
1170 | * zone->managed_pages is set to an approximate value in | |
1171 | * free_area_init_core(), which will cause | |
1172 | * /sys/device/system/node/nodeX/meminfo has wrong data. | |
1173 | * So reset it to 0 before any memory is onlined. | |
1174 | */ | |
1175 | reset_node_managed_pages(pgdat); | |
1176 | ||
0bd85420 TC |
1177 | /* |
1178 | * When memory is hot-added, all the memory is in offline state. So | |
1179 | * clear all zones' present_pages because they will be updated in | |
1180 | * online_pages() and offline_pages(). | |
1181 | */ | |
1182 | reset_node_present_pages(pgdat); | |
1183 | ||
9af3c2de YG |
1184 | return pgdat; |
1185 | } | |
1186 | ||
1187 | static void rollback_node_hotadd(int nid, pg_data_t *pgdat) | |
1188 | { | |
1189 | arch_refresh_nodedata(nid, NULL); | |
1190 | arch_free_nodedata(pgdat); | |
1191 | return; | |
1192 | } | |
1193 | ||
0a547039 | 1194 | |
01b0f197 TK |
1195 | /** |
1196 | * try_online_node - online a node if offlined | |
1197 | * | |
cf23422b | 1198 | * called by cpu_up() to online a node without onlined memory. |
1199 | */ | |
01b0f197 | 1200 | int try_online_node(int nid) |
cf23422b | 1201 | { |
1202 | pg_data_t *pgdat; | |
1203 | int ret; | |
1204 | ||
01b0f197 TK |
1205 | if (node_online(nid)) |
1206 | return 0; | |
1207 | ||
bfc8c901 | 1208 | mem_hotplug_begin(); |
cf23422b | 1209 | pgdat = hotadd_new_pgdat(nid, 0); |
7553e8f2 | 1210 | if (!pgdat) { |
01b0f197 | 1211 | pr_err("Cannot online node %d due to NULL pgdat\n", nid); |
cf23422b | 1212 | ret = -ENOMEM; |
1213 | goto out; | |
1214 | } | |
1215 | node_set_online(nid); | |
1216 | ret = register_one_node(nid); | |
1217 | BUG_ON(ret); | |
1218 | ||
01b0f197 TK |
1219 | if (pgdat->node_zonelists->_zonerefs->zone == NULL) { |
1220 | mutex_lock(&zonelists_mutex); | |
1221 | build_all_zonelists(NULL, NULL); | |
1222 | mutex_unlock(&zonelists_mutex); | |
1223 | } | |
1224 | ||
cf23422b | 1225 | out: |
bfc8c901 | 1226 | mem_hotplug_done(); |
cf23422b | 1227 | return ret; |
1228 | } | |
1229 | ||
27356f54 TK |
1230 | static int check_hotplug_memory_range(u64 start, u64 size) |
1231 | { | |
c8e861a5 | 1232 | u64 start_pfn = PFN_DOWN(start); |
27356f54 TK |
1233 | u64 nr_pages = size >> PAGE_SHIFT; |
1234 | ||
1235 | /* Memory range must be aligned with section */ | |
1236 | if ((start_pfn & ~PAGE_SECTION_MASK) || | |
1237 | (nr_pages % PAGES_PER_SECTION) || (!nr_pages)) { | |
1238 | pr_err("Section-unaligned hotplug range: start 0x%llx, size 0x%llx\n", | |
1239 | (unsigned long long)start, | |
1240 | (unsigned long long)size); | |
1241 | return -EINVAL; | |
1242 | } | |
1243 | ||
1244 | return 0; | |
1245 | } | |
1246 | ||
63264400 WN |
1247 | /* |
1248 | * If movable zone has already been setup, newly added memory should be check. | |
1249 | * If its address is higher than movable zone, it should be added as movable. | |
1250 | * Without this check, movable zone may overlap with other zone. | |
1251 | */ | |
1252 | static int should_add_memory_movable(int nid, u64 start, u64 size) | |
1253 | { | |
1254 | unsigned long start_pfn = start >> PAGE_SHIFT; | |
1255 | pg_data_t *pgdat = NODE_DATA(nid); | |
1256 | struct zone *movable_zone = pgdat->node_zones + ZONE_MOVABLE; | |
1257 | ||
1258 | if (zone_is_empty(movable_zone)) | |
1259 | return 0; | |
1260 | ||
1261 | if (movable_zone->zone_start_pfn <= start_pfn) | |
1262 | return 1; | |
1263 | ||
1264 | return 0; | |
1265 | } | |
1266 | ||
033fbae9 DW |
1267 | int zone_for_memory(int nid, u64 start, u64 size, int zone_default, |
1268 | bool for_device) | |
63264400 | 1269 | { |
033fbae9 DW |
1270 | #ifdef CONFIG_ZONE_DEVICE |
1271 | if (for_device) | |
1272 | return ZONE_DEVICE; | |
1273 | #endif | |
63264400 WN |
1274 | if (should_add_memory_movable(nid, start, size)) |
1275 | return ZONE_MOVABLE; | |
1276 | ||
1277 | return zone_default; | |
1278 | } | |
1279 | ||
31bc3858 VK |
1280 | static int online_memory_block(struct memory_block *mem, void *arg) |
1281 | { | |
1282 | return memory_block_change_state(mem, MEM_ONLINE, MEM_OFFLINE); | |
1283 | } | |
1284 | ||
31168481 | 1285 | /* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */ |
31bc3858 | 1286 | int __ref add_memory_resource(int nid, struct resource *res, bool online) |
bc02af93 | 1287 | { |
62cedb9f | 1288 | u64 start, size; |
9af3c2de | 1289 | pg_data_t *pgdat = NULL; |
a1e565aa TC |
1290 | bool new_pgdat; |
1291 | bool new_node; | |
bc02af93 YG |
1292 | int ret; |
1293 | ||
62cedb9f DV |
1294 | start = res->start; |
1295 | size = resource_size(res); | |
1296 | ||
27356f54 TK |
1297 | ret = check_hotplug_memory_range(start, size); |
1298 | if (ret) | |
1299 | return ret; | |
1300 | ||
a1e565aa TC |
1301 | { /* Stupid hack to suppress address-never-null warning */ |
1302 | void *p = NODE_DATA(nid); | |
1303 | new_pgdat = !p; | |
1304 | } | |
ac13c462 | 1305 | |
bfc8c901 | 1306 | mem_hotplug_begin(); |
ac13c462 | 1307 | |
7f36e3e5 TC |
1308 | /* |
1309 | * Add new range to memblock so that when hotadd_new_pgdat() is called | |
1310 | * to allocate new pgdat, get_pfn_range_for_nid() will be able to find | |
1311 | * this new range and calculate total pages correctly. The range will | |
1312 | * be removed at hot-remove time. | |
1313 | */ | |
1314 | memblock_add_node(start, size, nid); | |
1315 | ||
a1e565aa TC |
1316 | new_node = !node_online(nid); |
1317 | if (new_node) { | |
9af3c2de | 1318 | pgdat = hotadd_new_pgdat(nid, start); |
6ad696d2 | 1319 | ret = -ENOMEM; |
9af3c2de | 1320 | if (!pgdat) |
41b9e2d7 | 1321 | goto error; |
9af3c2de YG |
1322 | } |
1323 | ||
bc02af93 | 1324 | /* call arch's memory hotadd */ |
033fbae9 | 1325 | ret = arch_add_memory(nid, start, size, false); |
bc02af93 | 1326 | |
9af3c2de YG |
1327 | if (ret < 0) |
1328 | goto error; | |
1329 | ||
0fc44159 | 1330 | /* we online node here. we can't roll back from here. */ |
9af3c2de YG |
1331 | node_set_online(nid); |
1332 | ||
a1e565aa | 1333 | if (new_node) { |
0fc44159 YG |
1334 | ret = register_one_node(nid); |
1335 | /* | |
1336 | * If sysfs file of new node can't create, cpu on the node | |
1337 | * can't be hot-added. There is no rollback way now. | |
1338 | * So, check by BUG_ON() to catch it reluctantly.. | |
1339 | */ | |
1340 | BUG_ON(ret); | |
1341 | } | |
1342 | ||
d96ae530 | 1343 | /* create new memmap entry */ |
1344 | firmware_map_add_hotplug(start, start + size, "System RAM"); | |
1345 | ||
31bc3858 VK |
1346 | /* online pages if requested */ |
1347 | if (online) | |
1348 | walk_memory_range(PFN_DOWN(start), PFN_UP(start + size - 1), | |
1349 | NULL, online_memory_block); | |
1350 | ||
6ad696d2 AK |
1351 | goto out; |
1352 | ||
9af3c2de YG |
1353 | error: |
1354 | /* rollback pgdat allocation and others */ | |
1355 | if (new_pgdat) | |
1356 | rollback_node_hotadd(nid, pgdat); | |
7f36e3e5 | 1357 | memblock_remove(start, size); |
9af3c2de | 1358 | |
6ad696d2 | 1359 | out: |
bfc8c901 | 1360 | mem_hotplug_done(); |
bc02af93 YG |
1361 | return ret; |
1362 | } | |
62cedb9f DV |
1363 | EXPORT_SYMBOL_GPL(add_memory_resource); |
1364 | ||
1365 | int __ref add_memory(int nid, u64 start, u64 size) | |
1366 | { | |
1367 | struct resource *res; | |
1368 | int ret; | |
1369 | ||
1370 | res = register_memory_resource(start, size); | |
6f754ba4 VK |
1371 | if (IS_ERR(res)) |
1372 | return PTR_ERR(res); | |
62cedb9f | 1373 | |
31bc3858 | 1374 | ret = add_memory_resource(nid, res, memhp_auto_online); |
62cedb9f DV |
1375 | if (ret < 0) |
1376 | release_memory_resource(res); | |
1377 | return ret; | |
1378 | } | |
bc02af93 | 1379 | EXPORT_SYMBOL_GPL(add_memory); |
0c0e6195 KH |
1380 | |
1381 | #ifdef CONFIG_MEMORY_HOTREMOVE | |
5c755e9f BP |
1382 | /* |
1383 | * A free page on the buddy free lists (not the per-cpu lists) has PageBuddy | |
1384 | * set and the size of the free page is given by page_order(). Using this, | |
1385 | * the function determines if the pageblock contains only free pages. | |
1386 | * Due to buddy contraints, a free page at least the size of a pageblock will | |
1387 | * be located at the start of the pageblock | |
1388 | */ | |
1389 | static inline int pageblock_free(struct page *page) | |
1390 | { | |
1391 | return PageBuddy(page) && page_order(page) >= pageblock_order; | |
1392 | } | |
1393 | ||
1394 | /* Return the start of the next active pageblock after a given page */ | |
1395 | static struct page *next_active_pageblock(struct page *page) | |
1396 | { | |
5c755e9f BP |
1397 | /* Ensure the starting page is pageblock-aligned */ |
1398 | BUG_ON(page_to_pfn(page) & (pageblock_nr_pages - 1)); | |
1399 | ||
5c755e9f | 1400 | /* If the entire pageblock is free, move to the end of free page */ |
0dcc48c1 KH |
1401 | if (pageblock_free(page)) { |
1402 | int order; | |
1403 | /* be careful. we don't have locks, page_order can be changed.*/ | |
1404 | order = page_order(page); | |
1405 | if ((order < MAX_ORDER) && (order >= pageblock_order)) | |
1406 | return page + (1 << order); | |
1407 | } | |
5c755e9f | 1408 | |
0dcc48c1 | 1409 | return page + pageblock_nr_pages; |
5c755e9f BP |
1410 | } |
1411 | ||
1412 | /* Checks if this range of memory is likely to be hot-removable. */ | |
1413 | int is_mem_section_removable(unsigned long start_pfn, unsigned long nr_pages) | |
1414 | { | |
5c755e9f BP |
1415 | struct page *page = pfn_to_page(start_pfn); |
1416 | struct page *end_page = page + nr_pages; | |
1417 | ||
1418 | /* Check the starting page of each pageblock within the range */ | |
1419 | for (; page < end_page; page = next_active_pageblock(page)) { | |
49ac8255 | 1420 | if (!is_pageblock_removable_nolock(page)) |
5c755e9f | 1421 | return 0; |
49ac8255 | 1422 | cond_resched(); |
5c755e9f BP |
1423 | } |
1424 | ||
1425 | /* All pageblocks in the memory block are likely to be hot-removable */ | |
1426 | return 1; | |
1427 | } | |
1428 | ||
0c0e6195 KH |
1429 | /* |
1430 | * Confirm all pages in a range [start, end) is belongs to the same zone. | |
1431 | */ | |
ed2f2400 | 1432 | int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn) |
0c0e6195 | 1433 | { |
5f0f2887 | 1434 | unsigned long pfn, sec_end_pfn; |
0c0e6195 KH |
1435 | struct zone *zone = NULL; |
1436 | struct page *page; | |
1437 | int i; | |
5f0f2887 | 1438 | for (pfn = start_pfn, sec_end_pfn = SECTION_ALIGN_UP(start_pfn); |
0c0e6195 | 1439 | pfn < end_pfn; |
5f0f2887 AB |
1440 | pfn = sec_end_pfn + 1, sec_end_pfn += PAGES_PER_SECTION) { |
1441 | /* Make sure the memory section is present first */ | |
1442 | if (!present_section_nr(pfn_to_section_nr(pfn))) | |
0c0e6195 | 1443 | continue; |
5f0f2887 AB |
1444 | for (; pfn < sec_end_pfn && pfn < end_pfn; |
1445 | pfn += MAX_ORDER_NR_PAGES) { | |
1446 | i = 0; | |
1447 | /* This is just a CONFIG_HOLES_IN_ZONE check.*/ | |
1448 | while ((i < MAX_ORDER_NR_PAGES) && | |
1449 | !pfn_valid_within(pfn + i)) | |
1450 | i++; | |
1451 | if (i == MAX_ORDER_NR_PAGES) | |
1452 | continue; | |
1453 | page = pfn_to_page(pfn + i); | |
1454 | if (zone && page_zone(page) != zone) | |
1455 | return 0; | |
1456 | zone = page_zone(page); | |
1457 | } | |
0c0e6195 KH |
1458 | } |
1459 | return 1; | |
1460 | } | |
1461 | ||
1462 | /* | |
c8721bbb NH |
1463 | * Scan pfn range [start,end) to find movable/migratable pages (LRU pages |
1464 | * and hugepages). We scan pfn because it's much easier than scanning over | |
1465 | * linked list. This function returns the pfn of the first found movable | |
1466 | * page if it's found, otherwise 0. | |
0c0e6195 | 1467 | */ |
c8721bbb | 1468 | static unsigned long scan_movable_pages(unsigned long start, unsigned long end) |
0c0e6195 KH |
1469 | { |
1470 | unsigned long pfn; | |
1471 | struct page *page; | |
1472 | for (pfn = start; pfn < end; pfn++) { | |
1473 | if (pfn_valid(pfn)) { | |
1474 | page = pfn_to_page(pfn); | |
1475 | if (PageLRU(page)) | |
1476 | return pfn; | |
c8721bbb | 1477 | if (PageHuge(page)) { |
7e1f049e | 1478 | if (page_huge_active(page)) |
c8721bbb NH |
1479 | return pfn; |
1480 | else | |
1481 | pfn = round_up(pfn + 1, | |
1482 | 1 << compound_order(page)) - 1; | |
1483 | } | |
0c0e6195 KH |
1484 | } |
1485 | } | |
1486 | return 0; | |
1487 | } | |
1488 | ||
0c0e6195 KH |
1489 | #define NR_OFFLINE_AT_ONCE_PAGES (256) |
1490 | static int | |
1491 | do_migrate_range(unsigned long start_pfn, unsigned long end_pfn) | |
1492 | { | |
1493 | unsigned long pfn; | |
1494 | struct page *page; | |
1495 | int move_pages = NR_OFFLINE_AT_ONCE_PAGES; | |
1496 | int not_managed = 0; | |
1497 | int ret = 0; | |
1498 | LIST_HEAD(source); | |
1499 | ||
1500 | for (pfn = start_pfn; pfn < end_pfn && move_pages > 0; pfn++) { | |
1501 | if (!pfn_valid(pfn)) | |
1502 | continue; | |
1503 | page = pfn_to_page(pfn); | |
c8721bbb NH |
1504 | |
1505 | if (PageHuge(page)) { | |
1506 | struct page *head = compound_head(page); | |
1507 | pfn = page_to_pfn(head) + (1<<compound_order(head)) - 1; | |
1508 | if (compound_order(head) > PFN_SECTION_SHIFT) { | |
1509 | ret = -EBUSY; | |
1510 | break; | |
1511 | } | |
1512 | if (isolate_huge_page(page, &source)) | |
1513 | move_pages -= 1 << compound_order(head); | |
1514 | continue; | |
1515 | } | |
1516 | ||
700c2a46 | 1517 | if (!get_page_unless_zero(page)) |
0c0e6195 KH |
1518 | continue; |
1519 | /* | |
1520 | * We can skip free pages. And we can only deal with pages on | |
1521 | * LRU. | |
1522 | */ | |
62695a84 | 1523 | ret = isolate_lru_page(page); |
0c0e6195 | 1524 | if (!ret) { /* Success */ |
700c2a46 | 1525 | put_page(page); |
62695a84 | 1526 | list_add_tail(&page->lru, &source); |
0c0e6195 | 1527 | move_pages--; |
6d9c285a KM |
1528 | inc_zone_page_state(page, NR_ISOLATED_ANON + |
1529 | page_is_file_cache(page)); | |
1530 | ||
0c0e6195 | 1531 | } else { |
0c0e6195 | 1532 | #ifdef CONFIG_DEBUG_VM |
e33e33b4 | 1533 | pr_alert("removing pfn %lx from LRU failed\n", pfn); |
f0b791a3 | 1534 | dump_page(page, "failed to remove from LRU"); |
0c0e6195 | 1535 | #endif |
700c2a46 | 1536 | put_page(page); |
25985edc | 1537 | /* Because we don't have big zone->lock. we should |
809c4449 BL |
1538 | check this again here. */ |
1539 | if (page_count(page)) { | |
1540 | not_managed++; | |
f3ab2636 | 1541 | ret = -EBUSY; |
809c4449 BL |
1542 | break; |
1543 | } | |
0c0e6195 KH |
1544 | } |
1545 | } | |
f3ab2636 BL |
1546 | if (!list_empty(&source)) { |
1547 | if (not_managed) { | |
c8721bbb | 1548 | putback_movable_pages(&source); |
f3ab2636 BL |
1549 | goto out; |
1550 | } | |
74c08f98 MK |
1551 | |
1552 | /* | |
1553 | * alloc_migrate_target should be improooooved!! | |
1554 | * migrate_pages returns # of failed pages. | |
1555 | */ | |
68711a74 | 1556 | ret = migrate_pages(&source, alloc_migrate_target, NULL, 0, |
9c620e2b | 1557 | MIGRATE_SYNC, MR_MEMORY_HOTPLUG); |
f3ab2636 | 1558 | if (ret) |
c8721bbb | 1559 | putback_movable_pages(&source); |
0c0e6195 | 1560 | } |
0c0e6195 KH |
1561 | out: |
1562 | return ret; | |
1563 | } | |
1564 | ||
1565 | /* | |
1566 | * remove from free_area[] and mark all as Reserved. | |
1567 | */ | |
1568 | static int | |
1569 | offline_isolated_pages_cb(unsigned long start, unsigned long nr_pages, | |
1570 | void *data) | |
1571 | { | |
1572 | __offline_isolated_pages(start, start + nr_pages); | |
1573 | return 0; | |
1574 | } | |
1575 | ||
1576 | static void | |
1577 | offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn) | |
1578 | { | |
908eedc6 | 1579 | walk_system_ram_range(start_pfn, end_pfn - start_pfn, NULL, |
0c0e6195 KH |
1580 | offline_isolated_pages_cb); |
1581 | } | |
1582 | ||
1583 | /* | |
1584 | * Check all pages in range, recoreded as memory resource, are isolated. | |
1585 | */ | |
1586 | static int | |
1587 | check_pages_isolated_cb(unsigned long start_pfn, unsigned long nr_pages, | |
1588 | void *data) | |
1589 | { | |
1590 | int ret; | |
1591 | long offlined = *(long *)data; | |
b023f468 | 1592 | ret = test_pages_isolated(start_pfn, start_pfn + nr_pages, true); |
0c0e6195 KH |
1593 | offlined = nr_pages; |
1594 | if (!ret) | |
1595 | *(long *)data += offlined; | |
1596 | return ret; | |
1597 | } | |
1598 | ||
1599 | static long | |
1600 | check_pages_isolated(unsigned long start_pfn, unsigned long end_pfn) | |
1601 | { | |
1602 | long offlined = 0; | |
1603 | int ret; | |
1604 | ||
908eedc6 | 1605 | ret = walk_system_ram_range(start_pfn, end_pfn - start_pfn, &offlined, |
0c0e6195 KH |
1606 | check_pages_isolated_cb); |
1607 | if (ret < 0) | |
1608 | offlined = (long)ret; | |
1609 | return offlined; | |
1610 | } | |
1611 | ||
09285af7 | 1612 | #ifdef CONFIG_MOVABLE_NODE |
79a4dcef TC |
1613 | /* |
1614 | * When CONFIG_MOVABLE_NODE, we permit offlining of a node which doesn't have | |
1615 | * normal memory. | |
1616 | */ | |
09285af7 LJ |
1617 | static bool can_offline_normal(struct zone *zone, unsigned long nr_pages) |
1618 | { | |
1619 | return true; | |
1620 | } | |
79a4dcef | 1621 | #else /* CONFIG_MOVABLE_NODE */ |
74d42d8f LJ |
1622 | /* ensure the node has NORMAL memory if it is still online */ |
1623 | static bool can_offline_normal(struct zone *zone, unsigned long nr_pages) | |
1624 | { | |
1625 | struct pglist_data *pgdat = zone->zone_pgdat; | |
1626 | unsigned long present_pages = 0; | |
1627 | enum zone_type zt; | |
1628 | ||
1629 | for (zt = 0; zt <= ZONE_NORMAL; zt++) | |
1630 | present_pages += pgdat->node_zones[zt].present_pages; | |
1631 | ||
1632 | if (present_pages > nr_pages) | |
1633 | return true; | |
1634 | ||
1635 | present_pages = 0; | |
1636 | for (; zt <= ZONE_MOVABLE; zt++) | |
1637 | present_pages += pgdat->node_zones[zt].present_pages; | |
1638 | ||
1639 | /* | |
1640 | * we can't offline the last normal memory until all | |
1641 | * higher memory is offlined. | |
1642 | */ | |
1643 | return present_pages == 0; | |
1644 | } | |
79a4dcef | 1645 | #endif /* CONFIG_MOVABLE_NODE */ |
74d42d8f | 1646 | |
c5320926 TC |
1647 | static int __init cmdline_parse_movable_node(char *p) |
1648 | { | |
1649 | #ifdef CONFIG_MOVABLE_NODE | |
1650 | /* | |
1651 | * Memory used by the kernel cannot be hot-removed because Linux | |
1652 | * cannot migrate the kernel pages. When memory hotplug is | |
1653 | * enabled, we should prevent memblock from allocating memory | |
1654 | * for the kernel. | |
1655 | * | |
1656 | * ACPI SRAT records all hotpluggable memory ranges. But before | |
1657 | * SRAT is parsed, we don't know about it. | |
1658 | * | |
1659 | * The kernel image is loaded into memory at very early time. We | |
1660 | * cannot prevent this anyway. So on NUMA system, we set any | |
1661 | * node the kernel resides in as un-hotpluggable. | |
1662 | * | |
1663 | * Since on modern servers, one node could have double-digit | |
1664 | * gigabytes memory, we can assume the memory around the kernel | |
1665 | * image is also un-hotpluggable. So before SRAT is parsed, just | |
1666 | * allocate memory near the kernel image to try the best to keep | |
1667 | * the kernel away from hotpluggable memory. | |
1668 | */ | |
1669 | memblock_set_bottom_up(true); | |
55ac590c | 1670 | movable_node_enabled = true; |
c5320926 TC |
1671 | #else |
1672 | pr_warn("movable_node option not supported\n"); | |
1673 | #endif | |
1674 | return 0; | |
1675 | } | |
1676 | early_param("movable_node", cmdline_parse_movable_node); | |
1677 | ||
d9713679 LJ |
1678 | /* check which state of node_states will be changed when offline memory */ |
1679 | static void node_states_check_changes_offline(unsigned long nr_pages, | |
1680 | struct zone *zone, struct memory_notify *arg) | |
1681 | { | |
1682 | struct pglist_data *pgdat = zone->zone_pgdat; | |
1683 | unsigned long present_pages = 0; | |
1684 | enum zone_type zt, zone_last = ZONE_NORMAL; | |
1685 | ||
1686 | /* | |
6715ddf9 LJ |
1687 | * If we have HIGHMEM or movable node, node_states[N_NORMAL_MEMORY] |
1688 | * contains nodes which have zones of 0...ZONE_NORMAL, | |
1689 | * set zone_last to ZONE_NORMAL. | |
d9713679 | 1690 | * |
6715ddf9 LJ |
1691 | * If we don't have HIGHMEM nor movable node, |
1692 | * node_states[N_NORMAL_MEMORY] contains nodes which have zones of | |
1693 | * 0...ZONE_MOVABLE, set zone_last to ZONE_MOVABLE. | |
d9713679 | 1694 | */ |
6715ddf9 | 1695 | if (N_MEMORY == N_NORMAL_MEMORY) |
d9713679 LJ |
1696 | zone_last = ZONE_MOVABLE; |
1697 | ||
1698 | /* | |
1699 | * check whether node_states[N_NORMAL_MEMORY] will be changed. | |
1700 | * If the memory to be offline is in a zone of 0...zone_last, | |
1701 | * and it is the last present memory, 0...zone_last will | |
1702 | * become empty after offline , thus we can determind we will | |
1703 | * need to clear the node from node_states[N_NORMAL_MEMORY]. | |
1704 | */ | |
1705 | for (zt = 0; zt <= zone_last; zt++) | |
1706 | present_pages += pgdat->node_zones[zt].present_pages; | |
1707 | if (zone_idx(zone) <= zone_last && nr_pages >= present_pages) | |
1708 | arg->status_change_nid_normal = zone_to_nid(zone); | |
1709 | else | |
1710 | arg->status_change_nid_normal = -1; | |
1711 | ||
6715ddf9 LJ |
1712 | #ifdef CONFIG_HIGHMEM |
1713 | /* | |
1714 | * If we have movable node, node_states[N_HIGH_MEMORY] | |
1715 | * contains nodes which have zones of 0...ZONE_HIGHMEM, | |
1716 | * set zone_last to ZONE_HIGHMEM. | |
1717 | * | |
1718 | * If we don't have movable node, node_states[N_NORMAL_MEMORY] | |
1719 | * contains nodes which have zones of 0...ZONE_MOVABLE, | |
1720 | * set zone_last to ZONE_MOVABLE. | |
1721 | */ | |
1722 | zone_last = ZONE_HIGHMEM; | |
1723 | if (N_MEMORY == N_HIGH_MEMORY) | |
1724 | zone_last = ZONE_MOVABLE; | |
1725 | ||
1726 | for (; zt <= zone_last; zt++) | |
1727 | present_pages += pgdat->node_zones[zt].present_pages; | |
1728 | if (zone_idx(zone) <= zone_last && nr_pages >= present_pages) | |
1729 | arg->status_change_nid_high = zone_to_nid(zone); | |
1730 | else | |
1731 | arg->status_change_nid_high = -1; | |
1732 | #else | |
1733 | arg->status_change_nid_high = arg->status_change_nid_normal; | |
1734 | #endif | |
1735 | ||
d9713679 LJ |
1736 | /* |
1737 | * node_states[N_HIGH_MEMORY] contains nodes which have 0...ZONE_MOVABLE | |
1738 | */ | |
1739 | zone_last = ZONE_MOVABLE; | |
1740 | ||
1741 | /* | |
1742 | * check whether node_states[N_HIGH_MEMORY] will be changed | |
1743 | * If we try to offline the last present @nr_pages from the node, | |
1744 | * we can determind we will need to clear the node from | |
1745 | * node_states[N_HIGH_MEMORY]. | |
1746 | */ | |
1747 | for (; zt <= zone_last; zt++) | |
1748 | present_pages += pgdat->node_zones[zt].present_pages; | |
1749 | if (nr_pages >= present_pages) | |
1750 | arg->status_change_nid = zone_to_nid(zone); | |
1751 | else | |
1752 | arg->status_change_nid = -1; | |
1753 | } | |
1754 | ||
1755 | static void node_states_clear_node(int node, struct memory_notify *arg) | |
1756 | { | |
1757 | if (arg->status_change_nid_normal >= 0) | |
1758 | node_clear_state(node, N_NORMAL_MEMORY); | |
1759 | ||
6715ddf9 LJ |
1760 | if ((N_MEMORY != N_NORMAL_MEMORY) && |
1761 | (arg->status_change_nid_high >= 0)) | |
d9713679 | 1762 | node_clear_state(node, N_HIGH_MEMORY); |
6715ddf9 LJ |
1763 | |
1764 | if ((N_MEMORY != N_HIGH_MEMORY) && | |
1765 | (arg->status_change_nid >= 0)) | |
1766 | node_clear_state(node, N_MEMORY); | |
d9713679 LJ |
1767 | } |
1768 | ||
a16cee10 | 1769 | static int __ref __offline_pages(unsigned long start_pfn, |
0c0e6195 KH |
1770 | unsigned long end_pfn, unsigned long timeout) |
1771 | { | |
1772 | unsigned long pfn, nr_pages, expire; | |
1773 | long offlined_pages; | |
7b78d335 | 1774 | int ret, drain, retry_max, node; |
d702909f | 1775 | unsigned long flags; |
0c0e6195 | 1776 | struct zone *zone; |
7b78d335 | 1777 | struct memory_notify arg; |
0c0e6195 | 1778 | |
0c0e6195 KH |
1779 | /* at least, alignment against pageblock is necessary */ |
1780 | if (!IS_ALIGNED(start_pfn, pageblock_nr_pages)) | |
1781 | return -EINVAL; | |
1782 | if (!IS_ALIGNED(end_pfn, pageblock_nr_pages)) | |
1783 | return -EINVAL; | |
1784 | /* This makes hotplug much easier...and readable. | |
1785 | we assume this for now. .*/ | |
1786 | if (!test_pages_in_a_zone(start_pfn, end_pfn)) | |
1787 | return -EINVAL; | |
7b78d335 YG |
1788 | |
1789 | zone = page_zone(pfn_to_page(start_pfn)); | |
1790 | node = zone_to_nid(zone); | |
1791 | nr_pages = end_pfn - start_pfn; | |
1792 | ||
74d42d8f | 1793 | if (zone_idx(zone) <= ZONE_NORMAL && !can_offline_normal(zone, nr_pages)) |
30467e0b | 1794 | return -EINVAL; |
74d42d8f | 1795 | |
0c0e6195 | 1796 | /* set above range as isolated */ |
b023f468 WC |
1797 | ret = start_isolate_page_range(start_pfn, end_pfn, |
1798 | MIGRATE_MOVABLE, true); | |
0c0e6195 | 1799 | if (ret) |
30467e0b | 1800 | return ret; |
7b78d335 YG |
1801 | |
1802 | arg.start_pfn = start_pfn; | |
1803 | arg.nr_pages = nr_pages; | |
d9713679 | 1804 | node_states_check_changes_offline(nr_pages, zone, &arg); |
7b78d335 YG |
1805 | |
1806 | ret = memory_notify(MEM_GOING_OFFLINE, &arg); | |
1807 | ret = notifier_to_errno(ret); | |
1808 | if (ret) | |
1809 | goto failed_removal; | |
1810 | ||
0c0e6195 KH |
1811 | pfn = start_pfn; |
1812 | expire = jiffies + timeout; | |
1813 | drain = 0; | |
1814 | retry_max = 5; | |
1815 | repeat: | |
1816 | /* start memory hot removal */ | |
1817 | ret = -EAGAIN; | |
1818 | if (time_after(jiffies, expire)) | |
1819 | goto failed_removal; | |
1820 | ret = -EINTR; | |
1821 | if (signal_pending(current)) | |
1822 | goto failed_removal; | |
1823 | ret = 0; | |
1824 | if (drain) { | |
1825 | lru_add_drain_all(); | |
0c0e6195 | 1826 | cond_resched(); |
c0554329 | 1827 | drain_all_pages(zone); |
0c0e6195 KH |
1828 | } |
1829 | ||
c8721bbb NH |
1830 | pfn = scan_movable_pages(start_pfn, end_pfn); |
1831 | if (pfn) { /* We have movable pages */ | |
0c0e6195 KH |
1832 | ret = do_migrate_range(pfn, end_pfn); |
1833 | if (!ret) { | |
1834 | drain = 1; | |
1835 | goto repeat; | |
1836 | } else { | |
1837 | if (ret < 0) | |
1838 | if (--retry_max == 0) | |
1839 | goto failed_removal; | |
1840 | yield(); | |
1841 | drain = 1; | |
1842 | goto repeat; | |
1843 | } | |
1844 | } | |
b3834be5 | 1845 | /* drain all zone's lru pagevec, this is asynchronous... */ |
0c0e6195 | 1846 | lru_add_drain_all(); |
0c0e6195 | 1847 | yield(); |
b3834be5 | 1848 | /* drain pcp pages, this is synchronous. */ |
c0554329 | 1849 | drain_all_pages(zone); |
c8721bbb NH |
1850 | /* |
1851 | * dissolve free hugepages in the memory block before doing offlining | |
1852 | * actually in order to make hugetlbfs's object counting consistent. | |
1853 | */ | |
1854 | dissolve_free_huge_pages(start_pfn, end_pfn); | |
0c0e6195 KH |
1855 | /* check again */ |
1856 | offlined_pages = check_pages_isolated(start_pfn, end_pfn); | |
1857 | if (offlined_pages < 0) { | |
1858 | ret = -EBUSY; | |
1859 | goto failed_removal; | |
1860 | } | |
e33e33b4 | 1861 | pr_info("Offlined Pages %ld\n", offlined_pages); |
b3834be5 | 1862 | /* Ok, all of our target is isolated. |
0c0e6195 KH |
1863 | We cannot do rollback at this point. */ |
1864 | offline_isolated_pages(start_pfn, end_pfn); | |
dbc0e4ce | 1865 | /* reset pagetype flags and makes migrate type to be MOVABLE */ |
0815f3d8 | 1866 | undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE); |
0c0e6195 | 1867 | /* removal success */ |
3dcc0571 | 1868 | adjust_managed_page_count(pfn_to_page(start_pfn), -offlined_pages); |
0c0e6195 | 1869 | zone->present_pages -= offlined_pages; |
d702909f CS |
1870 | |
1871 | pgdat_resize_lock(zone->zone_pgdat, &flags); | |
0c0e6195 | 1872 | zone->zone_pgdat->node_present_pages -= offlined_pages; |
d702909f | 1873 | pgdat_resize_unlock(zone->zone_pgdat, &flags); |
7b78d335 | 1874 | |
1b79acc9 KM |
1875 | init_per_zone_wmark_min(); |
1876 | ||
1e8537ba | 1877 | if (!populated_zone(zone)) { |
340175b7 | 1878 | zone_pcp_reset(zone); |
1e8537ba XQ |
1879 | mutex_lock(&zonelists_mutex); |
1880 | build_all_zonelists(NULL, NULL); | |
1881 | mutex_unlock(&zonelists_mutex); | |
1882 | } else | |
1883 | zone_pcp_update(zone); | |
340175b7 | 1884 | |
d9713679 | 1885 | node_states_clear_node(node, &arg); |
698b1b30 | 1886 | if (arg.status_change_nid >= 0) { |
8fe23e05 | 1887 | kswapd_stop(node); |
698b1b30 VB |
1888 | kcompactd_stop(node); |
1889 | } | |
bce7394a | 1890 | |
0c0e6195 KH |
1891 | vm_total_pages = nr_free_pagecache_pages(); |
1892 | writeback_set_ratelimit(); | |
7b78d335 YG |
1893 | |
1894 | memory_notify(MEM_OFFLINE, &arg); | |
0c0e6195 KH |
1895 | return 0; |
1896 | ||
1897 | failed_removal: | |
e33e33b4 CY |
1898 | pr_debug("memory offlining [mem %#010llx-%#010llx] failed\n", |
1899 | (unsigned long long) start_pfn << PAGE_SHIFT, | |
1900 | ((unsigned long long) end_pfn << PAGE_SHIFT) - 1); | |
7b78d335 | 1901 | memory_notify(MEM_CANCEL_OFFLINE, &arg); |
0c0e6195 | 1902 | /* pushback to free area */ |
0815f3d8 | 1903 | undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE); |
0c0e6195 KH |
1904 | return ret; |
1905 | } | |
71088785 | 1906 | |
30467e0b | 1907 | /* Must be protected by mem_hotplug_begin() */ |
a16cee10 WC |
1908 | int offline_pages(unsigned long start_pfn, unsigned long nr_pages) |
1909 | { | |
1910 | return __offline_pages(start_pfn, start_pfn + nr_pages, 120 * HZ); | |
1911 | } | |
e2ff3940 | 1912 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
a16cee10 | 1913 | |
bbc76be6 WC |
1914 | /** |
1915 | * walk_memory_range - walks through all mem sections in [start_pfn, end_pfn) | |
1916 | * @start_pfn: start pfn of the memory range | |
e05c4bbf | 1917 | * @end_pfn: end pfn of the memory range |
bbc76be6 WC |
1918 | * @arg: argument passed to func |
1919 | * @func: callback for each memory section walked | |
1920 | * | |
1921 | * This function walks through all present mem sections in range | |
1922 | * [start_pfn, end_pfn) and call func on each mem section. | |
1923 | * | |
1924 | * Returns the return value of func. | |
1925 | */ | |
e2ff3940 | 1926 | int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn, |
bbc76be6 | 1927 | void *arg, int (*func)(struct memory_block *, void *)) |
71088785 | 1928 | { |
e90bdb7f WC |
1929 | struct memory_block *mem = NULL; |
1930 | struct mem_section *section; | |
e90bdb7f WC |
1931 | unsigned long pfn, section_nr; |
1932 | int ret; | |
e90bdb7f WC |
1933 | |
1934 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { | |
1935 | section_nr = pfn_to_section_nr(pfn); | |
1936 | if (!present_section_nr(section_nr)) | |
1937 | continue; | |
1938 | ||
1939 | section = __nr_to_section(section_nr); | |
1940 | /* same memblock? */ | |
1941 | if (mem) | |
1942 | if ((section_nr >= mem->start_section_nr) && | |
1943 | (section_nr <= mem->end_section_nr)) | |
1944 | continue; | |
1945 | ||
1946 | mem = find_memory_block_hinted(section, mem); | |
1947 | if (!mem) | |
1948 | continue; | |
1949 | ||
bbc76be6 | 1950 | ret = func(mem, arg); |
e90bdb7f | 1951 | if (ret) { |
bbc76be6 WC |
1952 | kobject_put(&mem->dev.kobj); |
1953 | return ret; | |
e90bdb7f WC |
1954 | } |
1955 | } | |
1956 | ||
1957 | if (mem) | |
1958 | kobject_put(&mem->dev.kobj); | |
1959 | ||
bbc76be6 WC |
1960 | return 0; |
1961 | } | |
1962 | ||
e2ff3940 | 1963 | #ifdef CONFIG_MEMORY_HOTREMOVE |
d6de9d53 | 1964 | static int check_memblock_offlined_cb(struct memory_block *mem, void *arg) |
bbc76be6 WC |
1965 | { |
1966 | int ret = !is_memblock_offlined(mem); | |
1967 | ||
349daa0f RD |
1968 | if (unlikely(ret)) { |
1969 | phys_addr_t beginpa, endpa; | |
1970 | ||
1971 | beginpa = PFN_PHYS(section_nr_to_pfn(mem->start_section_nr)); | |
1972 | endpa = PFN_PHYS(section_nr_to_pfn(mem->end_section_nr + 1))-1; | |
756a025f | 1973 | pr_warn("removing memory fails, because memory [%pa-%pa] is onlined\n", |
349daa0f RD |
1974 | &beginpa, &endpa); |
1975 | } | |
bbc76be6 WC |
1976 | |
1977 | return ret; | |
1978 | } | |
1979 | ||
0f1cfe9d | 1980 | static int check_cpu_on_node(pg_data_t *pgdat) |
60a5a19e | 1981 | { |
60a5a19e TC |
1982 | int cpu; |
1983 | ||
1984 | for_each_present_cpu(cpu) { | |
1985 | if (cpu_to_node(cpu) == pgdat->node_id) | |
1986 | /* | |
1987 | * the cpu on this node isn't removed, and we can't | |
1988 | * offline this node. | |
1989 | */ | |
1990 | return -EBUSY; | |
1991 | } | |
1992 | ||
1993 | return 0; | |
1994 | } | |
1995 | ||
0f1cfe9d | 1996 | static void unmap_cpu_on_node(pg_data_t *pgdat) |
e13fe869 WC |
1997 | { |
1998 | #ifdef CONFIG_ACPI_NUMA | |
e13fe869 WC |
1999 | int cpu; |
2000 | ||
2001 | for_each_possible_cpu(cpu) | |
2002 | if (cpu_to_node(cpu) == pgdat->node_id) | |
2003 | numa_clear_node(cpu); | |
2004 | #endif | |
2005 | } | |
2006 | ||
0f1cfe9d | 2007 | static int check_and_unmap_cpu_on_node(pg_data_t *pgdat) |
e13fe869 | 2008 | { |
0f1cfe9d | 2009 | int ret; |
e13fe869 | 2010 | |
0f1cfe9d | 2011 | ret = check_cpu_on_node(pgdat); |
e13fe869 WC |
2012 | if (ret) |
2013 | return ret; | |
2014 | ||
2015 | /* | |
2016 | * the node will be offlined when we come here, so we can clear | |
2017 | * the cpu_to_node() now. | |
2018 | */ | |
2019 | ||
0f1cfe9d | 2020 | unmap_cpu_on_node(pgdat); |
e13fe869 WC |
2021 | return 0; |
2022 | } | |
2023 | ||
0f1cfe9d TK |
2024 | /** |
2025 | * try_offline_node | |
2026 | * | |
2027 | * Offline a node if all memory sections and cpus of the node are removed. | |
2028 | * | |
2029 | * NOTE: The caller must call lock_device_hotplug() to serialize hotplug | |
2030 | * and online/offline operations before this call. | |
2031 | */ | |
90b30cdc | 2032 | void try_offline_node(int nid) |
60a5a19e | 2033 | { |
d822b86a WC |
2034 | pg_data_t *pgdat = NODE_DATA(nid); |
2035 | unsigned long start_pfn = pgdat->node_start_pfn; | |
2036 | unsigned long end_pfn = start_pfn + pgdat->node_spanned_pages; | |
60a5a19e | 2037 | unsigned long pfn; |
d822b86a | 2038 | int i; |
60a5a19e TC |
2039 | |
2040 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { | |
2041 | unsigned long section_nr = pfn_to_section_nr(pfn); | |
2042 | ||
2043 | if (!present_section_nr(section_nr)) | |
2044 | continue; | |
2045 | ||
2046 | if (pfn_to_nid(pfn) != nid) | |
2047 | continue; | |
2048 | ||
2049 | /* | |
2050 | * some memory sections of this node are not removed, and we | |
2051 | * can't offline node now. | |
2052 | */ | |
2053 | return; | |
2054 | } | |
2055 | ||
0f1cfe9d | 2056 | if (check_and_unmap_cpu_on_node(pgdat)) |
60a5a19e TC |
2057 | return; |
2058 | ||
2059 | /* | |
2060 | * all memory/cpu of this node are removed, we can offline this | |
2061 | * node now. | |
2062 | */ | |
2063 | node_set_offline(nid); | |
2064 | unregister_one_node(nid); | |
d822b86a | 2065 | |
d822b86a WC |
2066 | /* free waittable in each zone */ |
2067 | for (i = 0; i < MAX_NR_ZONES; i++) { | |
2068 | struct zone *zone = pgdat->node_zones + i; | |
2069 | ||
ca4b3f30 JW |
2070 | /* |
2071 | * wait_table may be allocated from boot memory, | |
2072 | * here only free if it's allocated by vmalloc. | |
2073 | */ | |
85bd8399 | 2074 | if (is_vmalloc_addr(zone->wait_table)) { |
d822b86a | 2075 | vfree(zone->wait_table); |
85bd8399 GZ |
2076 | zone->wait_table = NULL; |
2077 | } | |
d822b86a | 2078 | } |
60a5a19e | 2079 | } |
90b30cdc | 2080 | EXPORT_SYMBOL(try_offline_node); |
60a5a19e | 2081 | |
0f1cfe9d TK |
2082 | /** |
2083 | * remove_memory | |
2084 | * | |
2085 | * NOTE: The caller must call lock_device_hotplug() to serialize hotplug | |
2086 | * and online/offline operations before this call, as required by | |
2087 | * try_offline_node(). | |
2088 | */ | |
242831eb | 2089 | void __ref remove_memory(int nid, u64 start, u64 size) |
bbc76be6 | 2090 | { |
242831eb | 2091 | int ret; |
993c1aad | 2092 | |
27356f54 TK |
2093 | BUG_ON(check_hotplug_memory_range(start, size)); |
2094 | ||
bfc8c901 | 2095 | mem_hotplug_begin(); |
6677e3ea YI |
2096 | |
2097 | /* | |
242831eb RW |
2098 | * All memory blocks must be offlined before removing memory. Check |
2099 | * whether all memory blocks in question are offline and trigger a BUG() | |
2100 | * if this is not the case. | |
6677e3ea | 2101 | */ |
242831eb | 2102 | ret = walk_memory_range(PFN_DOWN(start), PFN_UP(start + size - 1), NULL, |
d6de9d53 | 2103 | check_memblock_offlined_cb); |
bfc8c901 | 2104 | if (ret) |
242831eb | 2105 | BUG(); |
6677e3ea | 2106 | |
46c66c4b YI |
2107 | /* remove memmap entry */ |
2108 | firmware_map_remove(start, start + size, "System RAM"); | |
f9126ab9 XQ |
2109 | memblock_free(start, size); |
2110 | memblock_remove(start, size); | |
46c66c4b | 2111 | |
24d335ca WC |
2112 | arch_remove_memory(start, size); |
2113 | ||
60a5a19e TC |
2114 | try_offline_node(nid); |
2115 | ||
bfc8c901 | 2116 | mem_hotplug_done(); |
71088785 | 2117 | } |
71088785 | 2118 | EXPORT_SYMBOL_GPL(remove_memory); |
aba6efc4 | 2119 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |