Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/mm/memory_hotplug.c |
| 3 | * |
| 4 | * Copyright (C) |
| 5 | */ |
| 6 | |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 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> |
| 12 | #include <linux/bootmem.h> |
| 13 | #include <linux/compiler.h> |
Paul Gortmaker | b95f1b31 | 2011-10-16 02:01:52 -0400 | [diff] [blame] | 14 | #include <linux/export.h> |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 15 | #include <linux/pagevec.h> |
Chandra Seetharaman | 2d1d43f | 2006-09-29 02:01:25 -0700 | [diff] [blame] | 16 | #include <linux/writeback.h> |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 17 | #include <linux/slab.h> |
| 18 | #include <linux/sysctl.h> |
| 19 | #include <linux/cpu.h> |
| 20 | #include <linux/memory.h> |
| 21 | #include <linux/memory_hotplug.h> |
| 22 | #include <linux/highmem.h> |
| 23 | #include <linux/vmalloc.h> |
KAMEZAWA Hiroyuki | 0a54703 | 2006-06-27 02:53:35 -0700 | [diff] [blame] | 24 | #include <linux/ioport.h> |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 25 | #include <linux/delay.h> |
| 26 | #include <linux/migrate.h> |
| 27 | #include <linux/page-isolation.h> |
Badari Pulavarty | 7108878 | 2008-10-18 20:25:58 -0700 | [diff] [blame] | 28 | #include <linux/pfn.h> |
Andi Kleen | 6ad696d | 2009-11-17 14:06:22 -0800 | [diff] [blame] | 29 | #include <linux/suspend.h> |
KOSAKI Motohiro | 6d9c285 | 2009-12-14 17:58:11 -0800 | [diff] [blame] | 30 | #include <linux/mm_inline.h> |
akpm@linux-foundation.org | d96ae53 | 2010-03-05 13:41:58 -0800 | [diff] [blame] | 31 | #include <linux/firmware-map.h> |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 32 | |
| 33 | #include <asm/tlbflush.h> |
| 34 | |
Adrian Bunk | 1e5ad9a | 2008-04-28 20:40:08 +0300 | [diff] [blame] | 35 | #include "internal.h" |
| 36 | |
Daniel Kiper | 9d0ad8c | 2011-07-25 17:12:05 -0700 | [diff] [blame] | 37 | /* |
| 38 | * online_page_callback contains pointer to current page onlining function. |
| 39 | * Initially it is generic_online_page(). If it is required it could be |
| 40 | * changed by calling set_online_page_callback() for callback registration |
| 41 | * and restore_online_page_callback() for generic callback restore. |
| 42 | */ |
| 43 | |
| 44 | static void generic_online_page(struct page *page); |
| 45 | |
| 46 | static online_page_callback_t online_page_callback = generic_online_page; |
| 47 | |
KOSAKI Motohiro | 20d6c96 | 2010-12-02 14:31:19 -0800 | [diff] [blame] | 48 | DEFINE_MUTEX(mem_hotplug_mutex); |
| 49 | |
| 50 | void lock_memory_hotplug(void) |
| 51 | { |
| 52 | mutex_lock(&mem_hotplug_mutex); |
| 53 | |
| 54 | /* for exclusive hibernation if CONFIG_HIBERNATION=y */ |
| 55 | lock_system_sleep(); |
| 56 | } |
| 57 | |
| 58 | void unlock_memory_hotplug(void) |
| 59 | { |
| 60 | unlock_system_sleep(); |
| 61 | mutex_unlock(&mem_hotplug_mutex); |
| 62 | } |
| 63 | |
| 64 | |
Keith Mannthey | 45e0b78 | 2006-09-30 23:27:09 -0700 | [diff] [blame] | 65 | /* add this memory to iomem resource */ |
| 66 | static struct resource *register_memory_resource(u64 start, u64 size) |
| 67 | { |
| 68 | struct resource *res; |
| 69 | res = kzalloc(sizeof(struct resource), GFP_KERNEL); |
| 70 | BUG_ON(!res); |
| 71 | |
| 72 | res->name = "System RAM"; |
| 73 | res->start = start; |
| 74 | res->end = start + size - 1; |
Yasunori Goto | 887c3cb | 2007-11-14 16:59:20 -0800 | [diff] [blame] | 75 | res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; |
Keith Mannthey | 45e0b78 | 2006-09-30 23:27:09 -0700 | [diff] [blame] | 76 | if (request_resource(&iomem_resource, res) < 0) { |
Bjorn Helgaas | a62e2f4 | 2012-05-29 15:06:30 -0700 | [diff] [blame] | 77 | printk("System RAM resource %pR cannot be added\n", res); |
Keith Mannthey | 45e0b78 | 2006-09-30 23:27:09 -0700 | [diff] [blame] | 78 | kfree(res); |
| 79 | res = NULL; |
| 80 | } |
| 81 | return res; |
| 82 | } |
| 83 | |
| 84 | static void release_memory_resource(struct resource *res) |
| 85 | { |
| 86 | if (!res) |
| 87 | return; |
| 88 | release_resource(res); |
| 89 | kfree(res); |
| 90 | return; |
| 91 | } |
| 92 | |
Keith Mannthey | 5394702 | 2006-09-30 23:27:08 -0700 | [diff] [blame] | 93 | #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE |
Yasunori Goto | 0475327 | 2008-04-28 02:13:31 -0700 | [diff] [blame] | 94 | #ifndef CONFIG_SPARSEMEM_VMEMMAP |
Andrea Arcangeli | 5f24ce5 | 2011-01-13 15:47:00 -0800 | [diff] [blame] | 95 | static void get_page_bootmem(unsigned long info, struct page *page, |
| 96 | unsigned long type) |
Yasunori Goto | 0475327 | 2008-04-28 02:13:31 -0700 | [diff] [blame] | 97 | { |
Andrea Arcangeli | 5f24ce5 | 2011-01-13 15:47:00 -0800 | [diff] [blame] | 98 | page->lru.next = (struct list_head *) type; |
Yasunori Goto | 0475327 | 2008-04-28 02:13:31 -0700 | [diff] [blame] | 99 | SetPagePrivate(page); |
| 100 | set_page_private(page, info); |
| 101 | atomic_inc(&page->_count); |
| 102 | } |
| 103 | |
Rakib Mullick | 23ce932 | 2009-12-14 17:59:44 -0800 | [diff] [blame] | 104 | /* reference to __meminit __free_pages_bootmem is valid |
| 105 | * so use __ref to tell modpost not to generate a warning */ |
| 106 | void __ref put_page_bootmem(struct page *page) |
Yasunori Goto | 0475327 | 2008-04-28 02:13:31 -0700 | [diff] [blame] | 107 | { |
Andrea Arcangeli | 5f24ce5 | 2011-01-13 15:47:00 -0800 | [diff] [blame] | 108 | unsigned long type; |
Yasunori Goto | 0475327 | 2008-04-28 02:13:31 -0700 | [diff] [blame] | 109 | |
Andrea Arcangeli | 5f24ce5 | 2011-01-13 15:47:00 -0800 | [diff] [blame] | 110 | type = (unsigned long) page->lru.next; |
| 111 | BUG_ON(type < MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE || |
| 112 | type > MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE); |
Yasunori Goto | 0475327 | 2008-04-28 02:13:31 -0700 | [diff] [blame] | 113 | |
| 114 | if (atomic_dec_return(&page->_count) == 1) { |
| 115 | ClearPagePrivate(page); |
| 116 | set_page_private(page, 0); |
Andrea Arcangeli | 5f24ce5 | 2011-01-13 15:47:00 -0800 | [diff] [blame] | 117 | INIT_LIST_HEAD(&page->lru); |
Yasunori Goto | 0475327 | 2008-04-28 02:13:31 -0700 | [diff] [blame] | 118 | __free_pages_bootmem(page, 0); |
| 119 | } |
| 120 | |
| 121 | } |
| 122 | |
Adrian Bunk | d92bc31 | 2008-07-23 21:28:12 -0700 | [diff] [blame] | 123 | static void register_page_bootmem_info_section(unsigned long start_pfn) |
Yasunori Goto | 0475327 | 2008-04-28 02:13:31 -0700 | [diff] [blame] | 124 | { |
| 125 | unsigned long *usemap, mapsize, section_nr, i; |
| 126 | struct mem_section *ms; |
| 127 | struct page *page, *memmap; |
| 128 | |
Yasunori Goto | 0475327 | 2008-04-28 02:13:31 -0700 | [diff] [blame] | 129 | section_nr = pfn_to_section_nr(start_pfn); |
| 130 | ms = __nr_to_section(section_nr); |
| 131 | |
| 132 | /* Get section's memmap address */ |
| 133 | memmap = sparse_decode_mem_map(ms->section_mem_map, section_nr); |
| 134 | |
| 135 | /* |
| 136 | * Get page for the memmap's phys address |
| 137 | * XXX: need more consideration for sparse_vmemmap... |
| 138 | */ |
| 139 | page = virt_to_page(memmap); |
| 140 | mapsize = sizeof(struct page) * PAGES_PER_SECTION; |
| 141 | mapsize = PAGE_ALIGN(mapsize) >> PAGE_SHIFT; |
| 142 | |
| 143 | /* remember memmap's page */ |
| 144 | for (i = 0; i < mapsize; i++, page++) |
| 145 | get_page_bootmem(section_nr, page, SECTION_INFO); |
| 146 | |
| 147 | usemap = __nr_to_section(section_nr)->pageblock_flags; |
| 148 | page = virt_to_page(usemap); |
| 149 | |
| 150 | mapsize = PAGE_ALIGN(usemap_size()) >> PAGE_SHIFT; |
| 151 | |
| 152 | for (i = 0; i < mapsize; i++, page++) |
Yasunori Goto | af370fb | 2008-07-23 21:28:17 -0700 | [diff] [blame] | 153 | get_page_bootmem(section_nr, page, MIX_SECTION_INFO); |
Yasunori Goto | 0475327 | 2008-04-28 02:13:31 -0700 | [diff] [blame] | 154 | |
| 155 | } |
| 156 | |
| 157 | void register_page_bootmem_info_node(struct pglist_data *pgdat) |
| 158 | { |
| 159 | unsigned long i, pfn, end_pfn, nr_pages; |
| 160 | int node = pgdat->node_id; |
| 161 | struct page *page; |
| 162 | struct zone *zone; |
| 163 | |
| 164 | nr_pages = PAGE_ALIGN(sizeof(struct pglist_data)) >> PAGE_SHIFT; |
| 165 | page = virt_to_page(pgdat); |
| 166 | |
| 167 | for (i = 0; i < nr_pages; i++, page++) |
| 168 | get_page_bootmem(node, page, NODE_INFO); |
| 169 | |
| 170 | zone = &pgdat->node_zones[0]; |
| 171 | for (; zone < pgdat->node_zones + MAX_NR_ZONES - 1; zone++) { |
| 172 | if (zone->wait_table) { |
| 173 | nr_pages = zone->wait_table_hash_nr_entries |
| 174 | * sizeof(wait_queue_head_t); |
| 175 | nr_pages = PAGE_ALIGN(nr_pages) >> PAGE_SHIFT; |
| 176 | page = virt_to_page(zone->wait_table); |
| 177 | |
| 178 | for (i = 0; i < nr_pages; i++, page++) |
| 179 | get_page_bootmem(node, page, NODE_INFO); |
| 180 | } |
| 181 | } |
| 182 | |
| 183 | pfn = pgdat->node_start_pfn; |
| 184 | end_pfn = pfn + pgdat->node_spanned_pages; |
| 185 | |
| 186 | /* register_section info */ |
qiuxishi | f14851a | 2012-09-17 14:09:24 -0700 | [diff] [blame] | 187 | for (; pfn < end_pfn; pfn += PAGES_PER_SECTION) { |
| 188 | /* |
| 189 | * Some platforms can assign the same pfn to multiple nodes - on |
| 190 | * node0 as well as nodeN. To avoid registering a pfn against |
| 191 | * multiple nodes we check that this pfn does not already |
| 192 | * reside in some other node. |
| 193 | */ |
| 194 | if (pfn_valid(pfn) && (pfn_to_nid(pfn) == node)) |
| 195 | register_page_bootmem_info_section(pfn); |
| 196 | } |
Yasunori Goto | 0475327 | 2008-04-28 02:13:31 -0700 | [diff] [blame] | 197 | } |
| 198 | #endif /* !CONFIG_SPARSEMEM_VMEMMAP */ |
| 199 | |
Heiko Carstens | 76cdd58 | 2008-05-14 16:05:52 -0700 | [diff] [blame] | 200 | static void grow_zone_span(struct zone *zone, unsigned long start_pfn, |
| 201 | unsigned long end_pfn) |
| 202 | { |
| 203 | unsigned long old_zone_end_pfn; |
| 204 | |
| 205 | zone_span_writelock(zone); |
| 206 | |
| 207 | old_zone_end_pfn = zone->zone_start_pfn + zone->spanned_pages; |
Tang Chen | 712cd38 | 2012-12-11 16:01:07 -0800 | [diff] [blame] | 208 | if (!zone->spanned_pages || start_pfn < zone->zone_start_pfn) |
Heiko Carstens | 76cdd58 | 2008-05-14 16:05:52 -0700 | [diff] [blame] | 209 | zone->zone_start_pfn = start_pfn; |
| 210 | |
| 211 | zone->spanned_pages = max(old_zone_end_pfn, end_pfn) - |
| 212 | zone->zone_start_pfn; |
| 213 | |
| 214 | zone_span_writeunlock(zone); |
| 215 | } |
| 216 | |
Lai Jiangshan | 511c2ab | 2012-12-11 16:03:16 -0800 | [diff] [blame^] | 217 | static void resize_zone(struct zone *zone, unsigned long start_pfn, |
| 218 | unsigned long end_pfn) |
| 219 | { |
| 220 | zone_span_writelock(zone); |
| 221 | |
| 222 | zone->zone_start_pfn = start_pfn; |
| 223 | zone->spanned_pages = end_pfn - start_pfn; |
| 224 | |
| 225 | zone_span_writeunlock(zone); |
| 226 | } |
| 227 | |
| 228 | static void fix_zone_id(struct zone *zone, unsigned long start_pfn, |
| 229 | unsigned long end_pfn) |
| 230 | { |
| 231 | enum zone_type zid = zone_idx(zone); |
| 232 | int nid = zone->zone_pgdat->node_id; |
| 233 | unsigned long pfn; |
| 234 | |
| 235 | for (pfn = start_pfn; pfn < end_pfn; pfn++) |
| 236 | set_page_links(pfn_to_page(pfn), zid, nid, pfn); |
| 237 | } |
| 238 | |
| 239 | static int move_pfn_range_left(struct zone *z1, struct zone *z2, |
| 240 | unsigned long start_pfn, unsigned long end_pfn) |
| 241 | { |
| 242 | unsigned long flags; |
| 243 | |
| 244 | pgdat_resize_lock(z1->zone_pgdat, &flags); |
| 245 | |
| 246 | /* can't move pfns which are higher than @z2 */ |
| 247 | if (end_pfn > z2->zone_start_pfn + z2->spanned_pages) |
| 248 | goto out_fail; |
| 249 | /* the move out part mast at the left most of @z2 */ |
| 250 | if (start_pfn > z2->zone_start_pfn) |
| 251 | goto out_fail; |
| 252 | /* must included/overlap */ |
| 253 | if (end_pfn <= z2->zone_start_pfn) |
| 254 | goto out_fail; |
| 255 | |
| 256 | resize_zone(z1, z1->zone_start_pfn, end_pfn); |
| 257 | resize_zone(z2, end_pfn, z2->zone_start_pfn + z2->spanned_pages); |
| 258 | |
| 259 | pgdat_resize_unlock(z1->zone_pgdat, &flags); |
| 260 | |
| 261 | fix_zone_id(z1, start_pfn, end_pfn); |
| 262 | |
| 263 | return 0; |
| 264 | out_fail: |
| 265 | pgdat_resize_unlock(z1->zone_pgdat, &flags); |
| 266 | return -1; |
| 267 | } |
| 268 | |
| 269 | static int move_pfn_range_right(struct zone *z1, struct zone *z2, |
| 270 | unsigned long start_pfn, unsigned long end_pfn) |
| 271 | { |
| 272 | unsigned long flags; |
| 273 | |
| 274 | pgdat_resize_lock(z1->zone_pgdat, &flags); |
| 275 | |
| 276 | /* can't move pfns which are lower than @z1 */ |
| 277 | if (z1->zone_start_pfn > start_pfn) |
| 278 | goto out_fail; |
| 279 | /* the move out part mast at the right most of @z1 */ |
| 280 | if (z1->zone_start_pfn + z1->spanned_pages > end_pfn) |
| 281 | goto out_fail; |
| 282 | /* must included/overlap */ |
| 283 | if (start_pfn >= z1->zone_start_pfn + z1->spanned_pages) |
| 284 | goto out_fail; |
| 285 | |
| 286 | resize_zone(z1, z1->zone_start_pfn, start_pfn); |
| 287 | resize_zone(z2, start_pfn, z2->zone_start_pfn + z2->spanned_pages); |
| 288 | |
| 289 | pgdat_resize_unlock(z1->zone_pgdat, &flags); |
| 290 | |
| 291 | fix_zone_id(z2, start_pfn, end_pfn); |
| 292 | |
| 293 | return 0; |
| 294 | out_fail: |
| 295 | pgdat_resize_unlock(z1->zone_pgdat, &flags); |
| 296 | return -1; |
| 297 | } |
| 298 | |
Heiko Carstens | 76cdd58 | 2008-05-14 16:05:52 -0700 | [diff] [blame] | 299 | static void grow_pgdat_span(struct pglist_data *pgdat, unsigned long start_pfn, |
| 300 | unsigned long end_pfn) |
| 301 | { |
| 302 | unsigned long old_pgdat_end_pfn = |
| 303 | pgdat->node_start_pfn + pgdat->node_spanned_pages; |
| 304 | |
Tang Chen | 712cd38 | 2012-12-11 16:01:07 -0800 | [diff] [blame] | 305 | if (!pgdat->node_spanned_pages || start_pfn < pgdat->node_start_pfn) |
Heiko Carstens | 76cdd58 | 2008-05-14 16:05:52 -0700 | [diff] [blame] | 306 | pgdat->node_start_pfn = start_pfn; |
| 307 | |
| 308 | pgdat->node_spanned_pages = max(old_pgdat_end_pfn, end_pfn) - |
| 309 | pgdat->node_start_pfn; |
| 310 | } |
| 311 | |
Al Viro | 3116848 | 2008-11-22 17:33:24 +0000 | [diff] [blame] | 312 | static int __meminit __add_zone(struct zone *zone, unsigned long phys_start_pfn) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 313 | { |
| 314 | struct pglist_data *pgdat = zone->zone_pgdat; |
| 315 | int nr_pages = PAGES_PER_SECTION; |
| 316 | int nid = pgdat->node_id; |
| 317 | int zone_type; |
Heiko Carstens | 76cdd58 | 2008-05-14 16:05:52 -0700 | [diff] [blame] | 318 | unsigned long flags; |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 319 | |
| 320 | zone_type = zone - pgdat->node_zones; |
Heiko Carstens | 76cdd58 | 2008-05-14 16:05:52 -0700 | [diff] [blame] | 321 | if (!zone->wait_table) { |
| 322 | int ret; |
| 323 | |
| 324 | ret = init_currently_empty_zone(zone, phys_start_pfn, |
| 325 | nr_pages, MEMMAP_HOTPLUG); |
| 326 | if (ret) |
| 327 | return ret; |
| 328 | } |
| 329 | pgdat_resize_lock(zone->zone_pgdat, &flags); |
| 330 | grow_zone_span(zone, phys_start_pfn, phys_start_pfn + nr_pages); |
| 331 | grow_pgdat_span(zone->zone_pgdat, phys_start_pfn, |
| 332 | phys_start_pfn + nr_pages); |
| 333 | pgdat_resize_unlock(zone->zone_pgdat, &flags); |
Dave Hansen | a2f3aa02 | 2007-01-10 23:15:30 -0800 | [diff] [blame] | 334 | memmap_init_zone(nr_pages, nid, zone_type, |
| 335 | phys_start_pfn, MEMMAP_HOTPLUG); |
Yasunori Goto | 718127c | 2006-06-23 02:03:10 -0700 | [diff] [blame] | 336 | return 0; |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 337 | } |
| 338 | |
Gary Hade | c04fc58 | 2009-01-06 14:39:14 -0800 | [diff] [blame] | 339 | static int __meminit __add_section(int nid, struct zone *zone, |
| 340 | unsigned long phys_start_pfn) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 341 | { |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 342 | int nr_pages = PAGES_PER_SECTION; |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 343 | int ret; |
| 344 | |
KAMEZAWA Hiroyuki | ebd1530 | 2006-08-05 12:15:06 -0700 | [diff] [blame] | 345 | if (pfn_valid(phys_start_pfn)) |
| 346 | return -EEXIST; |
| 347 | |
Dave Hansen | 0b0acbe | 2005-10-29 18:16:55 -0700 | [diff] [blame] | 348 | ret = sparse_add_one_section(zone, phys_start_pfn, nr_pages); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 349 | |
| 350 | if (ret < 0) |
| 351 | return ret; |
| 352 | |
Yasunori Goto | 718127c | 2006-06-23 02:03:10 -0700 | [diff] [blame] | 353 | ret = __add_zone(zone, phys_start_pfn); |
| 354 | |
| 355 | if (ret < 0) |
| 356 | return ret; |
| 357 | |
Gary Hade | c04fc58 | 2009-01-06 14:39:14 -0800 | [diff] [blame] | 358 | return register_new_memory(nid, __pfn_to_section(phys_start_pfn)); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 359 | } |
| 360 | |
Yasunori Goto | 0c0a4a5 | 2008-04-28 02:13:34 -0700 | [diff] [blame] | 361 | #ifdef CONFIG_SPARSEMEM_VMEMMAP |
| 362 | static int __remove_section(struct zone *zone, struct mem_section *ms) |
| 363 | { |
| 364 | /* |
| 365 | * XXX: Freeing memmap with vmemmap is not implement yet. |
| 366 | * This should be removed later. |
| 367 | */ |
| 368 | return -EBUSY; |
| 369 | } |
| 370 | #else |
Badari Pulavarty | ea01ea9 | 2008-04-28 02:12:01 -0700 | [diff] [blame] | 371 | static int __remove_section(struct zone *zone, struct mem_section *ms) |
| 372 | { |
| 373 | unsigned long flags; |
| 374 | struct pglist_data *pgdat = zone->zone_pgdat; |
| 375 | int ret = -EINVAL; |
| 376 | |
| 377 | if (!valid_section(ms)) |
| 378 | return ret; |
| 379 | |
| 380 | ret = unregister_memory_section(ms); |
| 381 | if (ret) |
| 382 | return ret; |
| 383 | |
| 384 | pgdat_resize_lock(pgdat, &flags); |
| 385 | sparse_remove_one_section(zone, ms); |
| 386 | pgdat_resize_unlock(pgdat, &flags); |
| 387 | return 0; |
| 388 | } |
Yasunori Goto | 0c0a4a5 | 2008-04-28 02:13:34 -0700 | [diff] [blame] | 389 | #endif |
Badari Pulavarty | ea01ea9 | 2008-04-28 02:12:01 -0700 | [diff] [blame] | 390 | |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 391 | /* |
| 392 | * Reasonably generic function for adding memory. It is |
| 393 | * expected that archs that support memory hotplug will |
| 394 | * call this function after deciding the zone to which to |
| 395 | * add the new pages. |
| 396 | */ |
Gary Hade | c04fc58 | 2009-01-06 14:39:14 -0800 | [diff] [blame] | 397 | int __ref __add_pages(int nid, struct zone *zone, unsigned long phys_start_pfn, |
| 398 | unsigned long nr_pages) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 399 | { |
| 400 | unsigned long i; |
| 401 | int err = 0; |
KAMEZAWA Hiroyuki | 6f71271 | 2006-08-05 12:14:58 -0700 | [diff] [blame] | 402 | int start_sec, end_sec; |
| 403 | /* during initialize mem_map, align hot-added range to section */ |
| 404 | start_sec = pfn_to_section_nr(phys_start_pfn); |
| 405 | end_sec = pfn_to_section_nr(phys_start_pfn + nr_pages - 1); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 406 | |
KAMEZAWA Hiroyuki | 6f71271 | 2006-08-05 12:14:58 -0700 | [diff] [blame] | 407 | for (i = start_sec; i <= end_sec; i++) { |
Gary Hade | c04fc58 | 2009-01-06 14:39:14 -0800 | [diff] [blame] | 408 | err = __add_section(nid, zone, i << PFN_SECTION_SHIFT); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 409 | |
KAMEZAWA Hiroyuki | 6f71271 | 2006-08-05 12:14:58 -0700 | [diff] [blame] | 410 | /* |
Simon Arlott | 183ff22 | 2007-10-20 01:27:18 +0200 | [diff] [blame] | 411 | * EEXIST is finally dealt with by ioresource collision |
KAMEZAWA Hiroyuki | 6f71271 | 2006-08-05 12:14:58 -0700 | [diff] [blame] | 412 | * check. see add_memory() => register_memory_resource() |
| 413 | * Warning will be printed if there is collision. |
Joel H Schopp | bed120c | 2006-05-01 12:16:11 -0700 | [diff] [blame] | 414 | */ |
| 415 | if (err && (err != -EEXIST)) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 416 | break; |
KAMEZAWA Hiroyuki | 6f71271 | 2006-08-05 12:14:58 -0700 | [diff] [blame] | 417 | err = 0; |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 418 | } |
| 419 | |
| 420 | return err; |
| 421 | } |
Joel H Schopp | bed120c | 2006-05-01 12:16:11 -0700 | [diff] [blame] | 422 | EXPORT_SYMBOL_GPL(__add_pages); |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 423 | |
Badari Pulavarty | ea01ea9 | 2008-04-28 02:12:01 -0700 | [diff] [blame] | 424 | /** |
| 425 | * __remove_pages() - remove sections of pages from a zone |
| 426 | * @zone: zone from which pages need to be removed |
| 427 | * @phys_start_pfn: starting pageframe (must be aligned to start of a section) |
| 428 | * @nr_pages: number of pages to remove (must be multiple of section size) |
| 429 | * |
| 430 | * Generic helper function to remove section mappings and sysfs entries |
| 431 | * for the section of the memory we are removing. Caller needs to make |
| 432 | * sure that pages are marked reserved and zones are adjust properly by |
| 433 | * calling offline_pages(). |
| 434 | */ |
| 435 | int __remove_pages(struct zone *zone, unsigned long phys_start_pfn, |
| 436 | unsigned long nr_pages) |
| 437 | { |
| 438 | unsigned long i, ret = 0; |
| 439 | int sections_to_remove; |
| 440 | |
| 441 | /* |
| 442 | * We can only remove entire sections |
| 443 | */ |
| 444 | BUG_ON(phys_start_pfn & ~PAGE_SECTION_MASK); |
| 445 | BUG_ON(nr_pages % PAGES_PER_SECTION); |
| 446 | |
Yasuaki Ishimatsu | d760afd | 2012-10-08 16:34:14 -0700 | [diff] [blame] | 447 | release_mem_region(phys_start_pfn << PAGE_SHIFT, nr_pages * PAGE_SIZE); |
| 448 | |
Badari Pulavarty | ea01ea9 | 2008-04-28 02:12:01 -0700 | [diff] [blame] | 449 | sections_to_remove = nr_pages / PAGES_PER_SECTION; |
| 450 | for (i = 0; i < sections_to_remove; i++) { |
| 451 | unsigned long pfn = phys_start_pfn + i*PAGES_PER_SECTION; |
| 452 | ret = __remove_section(zone, __pfn_to_section(pfn)); |
| 453 | if (ret) |
| 454 | break; |
| 455 | } |
| 456 | return ret; |
| 457 | } |
| 458 | EXPORT_SYMBOL_GPL(__remove_pages); |
| 459 | |
Daniel Kiper | 9d0ad8c | 2011-07-25 17:12:05 -0700 | [diff] [blame] | 460 | int set_online_page_callback(online_page_callback_t callback) |
| 461 | { |
| 462 | int rc = -EINVAL; |
| 463 | |
| 464 | lock_memory_hotplug(); |
| 465 | |
| 466 | if (online_page_callback == generic_online_page) { |
| 467 | online_page_callback = callback; |
| 468 | rc = 0; |
| 469 | } |
| 470 | |
| 471 | unlock_memory_hotplug(); |
| 472 | |
| 473 | return rc; |
| 474 | } |
| 475 | EXPORT_SYMBOL_GPL(set_online_page_callback); |
| 476 | |
| 477 | int restore_online_page_callback(online_page_callback_t callback) |
| 478 | { |
| 479 | int rc = -EINVAL; |
| 480 | |
| 481 | lock_memory_hotplug(); |
| 482 | |
| 483 | if (online_page_callback == callback) { |
| 484 | online_page_callback = generic_online_page; |
| 485 | rc = 0; |
| 486 | } |
| 487 | |
| 488 | unlock_memory_hotplug(); |
| 489 | |
| 490 | return rc; |
| 491 | } |
| 492 | EXPORT_SYMBOL_GPL(restore_online_page_callback); |
| 493 | |
| 494 | void __online_page_set_limits(struct page *page) |
Jeremy Fitzhardinge | 180c06e | 2008-04-28 02:12:03 -0700 | [diff] [blame] | 495 | { |
Jan Beulich | 4738e1b | 2009-09-21 17:03:03 -0700 | [diff] [blame] | 496 | unsigned long pfn = page_to_pfn(page); |
| 497 | |
Jan Beulich | 4738e1b | 2009-09-21 17:03:03 -0700 | [diff] [blame] | 498 | if (pfn >= num_physpages) |
| 499 | num_physpages = pfn + 1; |
Daniel Kiper | 9d0ad8c | 2011-07-25 17:12:05 -0700 | [diff] [blame] | 500 | } |
| 501 | EXPORT_SYMBOL_GPL(__online_page_set_limits); |
| 502 | |
| 503 | void __online_page_increment_counters(struct page *page) |
| 504 | { |
| 505 | totalram_pages++; |
Jeremy Fitzhardinge | 180c06e | 2008-04-28 02:12:03 -0700 | [diff] [blame] | 506 | |
| 507 | #ifdef CONFIG_HIGHMEM |
| 508 | if (PageHighMem(page)) |
| 509 | totalhigh_pages++; |
| 510 | #endif |
Daniel Kiper | 9d0ad8c | 2011-07-25 17:12:05 -0700 | [diff] [blame] | 511 | } |
| 512 | EXPORT_SYMBOL_GPL(__online_page_increment_counters); |
Jeremy Fitzhardinge | 180c06e | 2008-04-28 02:12:03 -0700 | [diff] [blame] | 513 | |
Daniel Kiper | 9d0ad8c | 2011-07-25 17:12:05 -0700 | [diff] [blame] | 514 | void __online_page_free(struct page *page) |
| 515 | { |
Jeremy Fitzhardinge | 180c06e | 2008-04-28 02:12:03 -0700 | [diff] [blame] | 516 | ClearPageReserved(page); |
| 517 | init_page_count(page); |
| 518 | __free_page(page); |
| 519 | } |
Daniel Kiper | 9d0ad8c | 2011-07-25 17:12:05 -0700 | [diff] [blame] | 520 | EXPORT_SYMBOL_GPL(__online_page_free); |
| 521 | |
| 522 | static void generic_online_page(struct page *page) |
| 523 | { |
| 524 | __online_page_set_limits(page); |
| 525 | __online_page_increment_counters(page); |
| 526 | __online_page_free(page); |
| 527 | } |
Jeremy Fitzhardinge | 180c06e | 2008-04-28 02:12:03 -0700 | [diff] [blame] | 528 | |
KAMEZAWA Hiroyuki | 75884fb | 2007-10-16 01:26:10 -0700 | [diff] [blame] | 529 | static int online_pages_range(unsigned long start_pfn, unsigned long nr_pages, |
| 530 | void *arg) |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 531 | { |
| 532 | unsigned long i; |
KAMEZAWA Hiroyuki | 75884fb | 2007-10-16 01:26:10 -0700 | [diff] [blame] | 533 | unsigned long onlined_pages = *(unsigned long *)arg; |
| 534 | struct page *page; |
| 535 | if (PageReserved(pfn_to_page(start_pfn))) |
| 536 | for (i = 0; i < nr_pages; i++) { |
| 537 | page = pfn_to_page(start_pfn + i); |
Daniel Kiper | 9d0ad8c | 2011-07-25 17:12:05 -0700 | [diff] [blame] | 538 | (*online_page_callback)(page); |
KAMEZAWA Hiroyuki | 75884fb | 2007-10-16 01:26:10 -0700 | [diff] [blame] | 539 | onlined_pages++; |
| 540 | } |
| 541 | *(unsigned long *)arg = onlined_pages; |
| 542 | return 0; |
| 543 | } |
| 544 | |
Lai Jiangshan | d971367 | 2012-12-11 16:01:03 -0800 | [diff] [blame] | 545 | /* check which state of node_states will be changed when online memory */ |
| 546 | static void node_states_check_changes_online(unsigned long nr_pages, |
| 547 | struct zone *zone, struct memory_notify *arg) |
| 548 | { |
| 549 | int nid = zone_to_nid(zone); |
| 550 | enum zone_type zone_last = ZONE_NORMAL; |
| 551 | |
| 552 | /* |
| 553 | * If we have HIGHMEM, node_states[N_NORMAL_MEMORY] contains nodes |
| 554 | * which have 0...ZONE_NORMAL, set zone_last to ZONE_NORMAL. |
| 555 | * |
| 556 | * If we don't have HIGHMEM, node_states[N_NORMAL_MEMORY] contains nodes |
| 557 | * which have 0...ZONE_MOVABLE, set zone_last to ZONE_MOVABLE. |
| 558 | */ |
| 559 | if (N_HIGH_MEMORY == N_NORMAL_MEMORY) |
| 560 | zone_last = ZONE_MOVABLE; |
| 561 | |
| 562 | /* |
| 563 | * if the memory to be online is in a zone of 0...zone_last, and |
| 564 | * the zones of 0...zone_last don't have memory before online, we will |
| 565 | * need to set the node to node_states[N_NORMAL_MEMORY] after |
| 566 | * the memory is online. |
| 567 | */ |
| 568 | if (zone_idx(zone) <= zone_last && !node_state(nid, N_NORMAL_MEMORY)) |
| 569 | arg->status_change_nid_normal = nid; |
| 570 | else |
| 571 | arg->status_change_nid_normal = -1; |
| 572 | |
| 573 | /* |
| 574 | * if the node don't have memory befor online, we will need to |
| 575 | * set the node to node_states[N_HIGH_MEMORY] after the memory |
| 576 | * is online. |
| 577 | */ |
| 578 | if (!node_state(nid, N_HIGH_MEMORY)) |
| 579 | arg->status_change_nid = nid; |
| 580 | else |
| 581 | arg->status_change_nid = -1; |
| 582 | } |
| 583 | |
| 584 | static void node_states_set_node(int node, struct memory_notify *arg) |
| 585 | { |
| 586 | if (arg->status_change_nid_normal >= 0) |
| 587 | node_set_state(node, N_NORMAL_MEMORY); |
| 588 | |
| 589 | node_set_state(node, N_HIGH_MEMORY); |
| 590 | } |
| 591 | |
KAMEZAWA Hiroyuki | 75884fb | 2007-10-16 01:26:10 -0700 | [diff] [blame] | 592 | |
Lai Jiangshan | 511c2ab | 2012-12-11 16:03:16 -0800 | [diff] [blame^] | 593 | int __ref online_pages(unsigned long pfn, unsigned long nr_pages, int online_type) |
KAMEZAWA Hiroyuki | 75884fb | 2007-10-16 01:26:10 -0700 | [diff] [blame] | 594 | { |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 595 | unsigned long onlined_pages = 0; |
| 596 | struct zone *zone; |
Yasunori Goto | 6811378 | 2006-06-23 02:03:11 -0700 | [diff] [blame] | 597 | int need_zonelists_rebuild = 0; |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 598 | int nid; |
| 599 | int ret; |
| 600 | struct memory_notify arg; |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 601 | |
KAMEZAWA Hiroyuki | 925268a | 2011-01-11 16:44:01 +0900 | [diff] [blame] | 602 | lock_memory_hotplug(); |
Lai Jiangshan | d971367 | 2012-12-11 16:01:03 -0800 | [diff] [blame] | 603 | /* |
| 604 | * This doesn't need a lock to do pfn_to_page(). |
| 605 | * The section can't be removed here because of the |
| 606 | * memory_block->state_mutex. |
| 607 | */ |
| 608 | zone = page_zone(pfn_to_page(pfn)); |
| 609 | |
Lai Jiangshan | 511c2ab | 2012-12-11 16:03:16 -0800 | [diff] [blame^] | 610 | if (online_type == ONLINE_KERNEL && zone_idx(zone) == ZONE_MOVABLE) { |
| 611 | if (move_pfn_range_left(zone - 1, zone, pfn, pfn + nr_pages)) { |
| 612 | unlock_memory_hotplug(); |
| 613 | return -1; |
| 614 | } |
| 615 | } |
| 616 | if (online_type == ONLINE_MOVABLE && zone_idx(zone) == ZONE_MOVABLE - 1) { |
| 617 | if (move_pfn_range_right(zone, zone + 1, pfn, pfn + nr_pages)) { |
| 618 | unlock_memory_hotplug(); |
| 619 | return -1; |
| 620 | } |
| 621 | } |
| 622 | |
| 623 | /* Previous code may changed the zone of the pfn range */ |
| 624 | zone = page_zone(pfn_to_page(pfn)); |
| 625 | |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 626 | arg.start_pfn = pfn; |
| 627 | arg.nr_pages = nr_pages; |
Lai Jiangshan | d971367 | 2012-12-11 16:01:03 -0800 | [diff] [blame] | 628 | node_states_check_changes_online(nr_pages, zone, &arg); |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 629 | |
| 630 | nid = page_to_nid(pfn_to_page(pfn)); |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 631 | |
| 632 | ret = memory_notify(MEM_GOING_ONLINE, &arg); |
| 633 | ret = notifier_to_errno(ret); |
| 634 | if (ret) { |
| 635 | memory_notify(MEM_CANCEL_ONLINE, &arg); |
KAMEZAWA Hiroyuki | 925268a | 2011-01-11 16:44:01 +0900 | [diff] [blame] | 636 | unlock_memory_hotplug(); |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 637 | return ret; |
| 638 | } |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 639 | /* |
Yasunori Goto | 6811378 | 2006-06-23 02:03:11 -0700 | [diff] [blame] | 640 | * If this zone is not populated, then it is not in zonelist. |
| 641 | * This means the page allocator ignores this zone. |
| 642 | * So, zonelist must be updated after online. |
| 643 | */ |
Haicheng Li | 4eaf3f6 | 2010-05-24 14:32:52 -0700 | [diff] [blame] | 644 | mutex_lock(&zonelists_mutex); |
Wen Congyang | 6dcd73d | 2012-12-11 16:01:01 -0800 | [diff] [blame] | 645 | if (!populated_zone(zone)) { |
Yasunori Goto | 6811378 | 2006-06-23 02:03:11 -0700 | [diff] [blame] | 646 | need_zonelists_rebuild = 1; |
Wen Congyang | 6dcd73d | 2012-12-11 16:01:01 -0800 | [diff] [blame] | 647 | build_all_zonelists(NULL, zone); |
| 648 | } |
Yasunori Goto | 6811378 | 2006-06-23 02:03:11 -0700 | [diff] [blame] | 649 | |
KAMEZAWA Hiroyuki | 908eedc | 2009-09-22 16:45:46 -0700 | [diff] [blame] | 650 | ret = walk_system_ram_range(pfn, nr_pages, &onlined_pages, |
KAMEZAWA Hiroyuki | 75884fb | 2007-10-16 01:26:10 -0700 | [diff] [blame] | 651 | online_pages_range); |
Geoff Levand | fd8a422 | 2008-05-14 16:05:50 -0700 | [diff] [blame] | 652 | if (ret) { |
Wen Congyang | 6dcd73d | 2012-12-11 16:01:01 -0800 | [diff] [blame] | 653 | if (need_zonelists_rebuild) |
| 654 | zone_pcp_reset(zone); |
Haicheng Li | 4eaf3f6 | 2010-05-24 14:32:52 -0700 | [diff] [blame] | 655 | mutex_unlock(&zonelists_mutex); |
Bjorn Helgaas | a62e2f4 | 2012-05-29 15:06:30 -0700 | [diff] [blame] | 656 | printk(KERN_DEBUG "online_pages [mem %#010llx-%#010llx] failed\n", |
| 657 | (unsigned long long) pfn << PAGE_SHIFT, |
| 658 | (((unsigned long long) pfn + nr_pages) |
| 659 | << PAGE_SHIFT) - 1); |
Geoff Levand | fd8a422 | 2008-05-14 16:05:50 -0700 | [diff] [blame] | 660 | memory_notify(MEM_CANCEL_ONLINE, &arg); |
KAMEZAWA Hiroyuki | 925268a | 2011-01-11 16:44:01 +0900 | [diff] [blame] | 661 | unlock_memory_hotplug(); |
Geoff Levand | fd8a422 | 2008-05-14 16:05:50 -0700 | [diff] [blame] | 662 | return ret; |
| 663 | } |
| 664 | |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 665 | zone->present_pages += onlined_pages; |
Yasunori Goto | f2937be | 2006-03-09 17:33:51 -0800 | [diff] [blame] | 666 | zone->zone_pgdat->node_present_pages += onlined_pages; |
Jiang Liu | 08dff7b | 2012-07-31 16:43:30 -0700 | [diff] [blame] | 667 | if (onlined_pages) { |
Lai Jiangshan | d971367 | 2012-12-11 16:01:03 -0800 | [diff] [blame] | 668 | node_states_set_node(zone_to_nid(zone), &arg); |
Jiang Liu | 08dff7b | 2012-07-31 16:43:30 -0700 | [diff] [blame] | 669 | if (need_zonelists_rebuild) |
Wen Congyang | 6dcd73d | 2012-12-11 16:01:01 -0800 | [diff] [blame] | 670 | build_all_zonelists(NULL, NULL); |
Jiang Liu | 08dff7b | 2012-07-31 16:43:30 -0700 | [diff] [blame] | 671 | else |
| 672 | zone_pcp_update(zone); |
| 673 | } |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 674 | |
Haicheng Li | 4eaf3f6 | 2010-05-24 14:32:52 -0700 | [diff] [blame] | 675 | mutex_unlock(&zonelists_mutex); |
KOSAKI Motohiro | 1b79acc | 2011-05-24 17:11:32 -0700 | [diff] [blame] | 676 | |
| 677 | init_per_zone_wmark_min(); |
| 678 | |
Jiang Liu | 08dff7b | 2012-07-31 16:43:30 -0700 | [diff] [blame] | 679 | if (onlined_pages) |
Christoph Lameter | 7ea1530 | 2007-10-16 01:25:29 -0700 | [diff] [blame] | 680 | kswapd_run(zone_to_nid(zone)); |
Dave Hansen | 61b1399 | 2005-10-29 18:16:56 -0700 | [diff] [blame] | 681 | |
Haicheng Li | 1f52250 | 2010-05-24 14:32:51 -0700 | [diff] [blame] | 682 | vm_total_pages = nr_free_pagecache_pages(); |
Kent Liu | 2f7f24e | 2008-07-23 21:28:18 -0700 | [diff] [blame] | 683 | |
Chandra Seetharaman | 2d1d43f | 2006-09-29 02:01:25 -0700 | [diff] [blame] | 684 | writeback_set_ratelimit(); |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 685 | |
| 686 | if (onlined_pages) |
| 687 | memory_notify(MEM_ONLINE, &arg); |
KAMEZAWA Hiroyuki | 925268a | 2011-01-11 16:44:01 +0900 | [diff] [blame] | 688 | unlock_memory_hotplug(); |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 689 | |
Dave Hansen | 3947be1 | 2005-10-29 18:16:54 -0700 | [diff] [blame] | 690 | return 0; |
| 691 | } |
Keith Mannthey | 5394702 | 2006-09-30 23:27:08 -0700 | [diff] [blame] | 692 | #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 693 | |
Hidetoshi Seto | e131933 | 2009-11-17 14:06:18 -0800 | [diff] [blame] | 694 | /* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */ |
| 695 | static pg_data_t __ref *hotadd_new_pgdat(int nid, u64 start) |
Yasunori Goto | 9af3c2d | 2006-06-27 02:53:34 -0700 | [diff] [blame] | 696 | { |
| 697 | struct pglist_data *pgdat; |
| 698 | unsigned long zones_size[MAX_NR_ZONES] = {0}; |
| 699 | unsigned long zholes_size[MAX_NR_ZONES] = {0}; |
| 700 | unsigned long start_pfn = start >> PAGE_SHIFT; |
| 701 | |
| 702 | pgdat = arch_alloc_nodedata(nid); |
| 703 | if (!pgdat) |
| 704 | return NULL; |
| 705 | |
| 706 | arch_refresh_nodedata(nid, pgdat); |
| 707 | |
| 708 | /* we can use NODE_DATA(nid) from here */ |
| 709 | |
| 710 | /* init node's zones as empty zones, we don't have any present pages.*/ |
Johannes Weiner | 9109fb7 | 2008-07-23 21:27:20 -0700 | [diff] [blame] | 711 | free_area_init_node(nid, zones_size, start_pfn, zholes_size); |
Yasunori Goto | 9af3c2d | 2006-06-27 02:53:34 -0700 | [diff] [blame] | 712 | |
KAMEZAWA Hiroyuki | 959ecc4 | 2011-06-15 15:08:38 -0700 | [diff] [blame] | 713 | /* |
| 714 | * The node we allocated has no zone fallback lists. For avoiding |
| 715 | * to access not-initialized zonelist, build here. |
| 716 | */ |
David Rientjes | f957db4 | 2011-06-22 18:13:04 -0700 | [diff] [blame] | 717 | mutex_lock(&zonelists_mutex); |
Jiang Liu | 9adb62a | 2012-07-31 16:43:28 -0700 | [diff] [blame] | 718 | build_all_zonelists(pgdat, NULL); |
David Rientjes | f957db4 | 2011-06-22 18:13:04 -0700 | [diff] [blame] | 719 | mutex_unlock(&zonelists_mutex); |
KAMEZAWA Hiroyuki | 959ecc4 | 2011-06-15 15:08:38 -0700 | [diff] [blame] | 720 | |
Yasunori Goto | 9af3c2d | 2006-06-27 02:53:34 -0700 | [diff] [blame] | 721 | return pgdat; |
| 722 | } |
| 723 | |
| 724 | static void rollback_node_hotadd(int nid, pg_data_t *pgdat) |
| 725 | { |
| 726 | arch_refresh_nodedata(nid, NULL); |
| 727 | arch_free_nodedata(pgdat); |
| 728 | return; |
| 729 | } |
| 730 | |
KAMEZAWA Hiroyuki | 0a54703 | 2006-06-27 02:53:35 -0700 | [diff] [blame] | 731 | |
minskey guo | cf23422 | 2010-05-24 14:32:41 -0700 | [diff] [blame] | 732 | /* |
| 733 | * called by cpu_up() to online a node without onlined memory. |
| 734 | */ |
| 735 | int mem_online_node(int nid) |
| 736 | { |
| 737 | pg_data_t *pgdat; |
| 738 | int ret; |
| 739 | |
KOSAKI Motohiro | 20d6c96 | 2010-12-02 14:31:19 -0800 | [diff] [blame] | 740 | lock_memory_hotplug(); |
minskey guo | cf23422 | 2010-05-24 14:32:41 -0700 | [diff] [blame] | 741 | pgdat = hotadd_new_pgdat(nid, 0); |
David Rientjes | 7553e8f | 2011-06-22 18:13:01 -0700 | [diff] [blame] | 742 | if (!pgdat) { |
minskey guo | cf23422 | 2010-05-24 14:32:41 -0700 | [diff] [blame] | 743 | ret = -ENOMEM; |
| 744 | goto out; |
| 745 | } |
| 746 | node_set_online(nid); |
| 747 | ret = register_one_node(nid); |
| 748 | BUG_ON(ret); |
| 749 | |
| 750 | out: |
KOSAKI Motohiro | 20d6c96 | 2010-12-02 14:31:19 -0800 | [diff] [blame] | 751 | unlock_memory_hotplug(); |
minskey guo | cf23422 | 2010-05-24 14:32:41 -0700 | [diff] [blame] | 752 | return ret; |
| 753 | } |
| 754 | |
Al Viro | 3116848 | 2008-11-22 17:33:24 +0000 | [diff] [blame] | 755 | /* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */ |
| 756 | int __ref add_memory(int nid, u64 start, u64 size) |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 757 | { |
Yasunori Goto | 9af3c2d | 2006-06-27 02:53:34 -0700 | [diff] [blame] | 758 | pg_data_t *pgdat = NULL; |
| 759 | int new_pgdat = 0; |
KAMEZAWA Hiroyuki | ebd1530 | 2006-08-05 12:15:06 -0700 | [diff] [blame] | 760 | struct resource *res; |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 761 | int ret; |
| 762 | |
KOSAKI Motohiro | 20d6c96 | 2010-12-02 14:31:19 -0800 | [diff] [blame] | 763 | lock_memory_hotplug(); |
Andi Kleen | 6ad696d | 2009-11-17 14:06:22 -0800 | [diff] [blame] | 764 | |
KAMEZAWA Hiroyuki | ebd1530 | 2006-08-05 12:15:06 -0700 | [diff] [blame] | 765 | res = register_memory_resource(start, size); |
Andi Kleen | 6ad696d | 2009-11-17 14:06:22 -0800 | [diff] [blame] | 766 | ret = -EEXIST; |
KAMEZAWA Hiroyuki | ebd1530 | 2006-08-05 12:15:06 -0700 | [diff] [blame] | 767 | if (!res) |
Andi Kleen | 6ad696d | 2009-11-17 14:06:22 -0800 | [diff] [blame] | 768 | goto out; |
KAMEZAWA Hiroyuki | ebd1530 | 2006-08-05 12:15:06 -0700 | [diff] [blame] | 769 | |
Yasunori Goto | 9af3c2d | 2006-06-27 02:53:34 -0700 | [diff] [blame] | 770 | if (!node_online(nid)) { |
| 771 | pgdat = hotadd_new_pgdat(nid, start); |
Andi Kleen | 6ad696d | 2009-11-17 14:06:22 -0800 | [diff] [blame] | 772 | ret = -ENOMEM; |
Yasunori Goto | 9af3c2d | 2006-06-27 02:53:34 -0700 | [diff] [blame] | 773 | if (!pgdat) |
Wen Congyang | 41b9e2d | 2012-07-11 14:02:31 -0700 | [diff] [blame] | 774 | goto error; |
Yasunori Goto | 9af3c2d | 2006-06-27 02:53:34 -0700 | [diff] [blame] | 775 | new_pgdat = 1; |
Yasunori Goto | 9af3c2d | 2006-06-27 02:53:34 -0700 | [diff] [blame] | 776 | } |
| 777 | |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 778 | /* call arch's memory hotadd */ |
| 779 | ret = arch_add_memory(nid, start, size); |
| 780 | |
Yasunori Goto | 9af3c2d | 2006-06-27 02:53:34 -0700 | [diff] [blame] | 781 | if (ret < 0) |
| 782 | goto error; |
| 783 | |
Yasunori Goto | 0fc4415 | 2006-06-27 02:53:38 -0700 | [diff] [blame] | 784 | /* we online node here. we can't roll back from here. */ |
Yasunori Goto | 9af3c2d | 2006-06-27 02:53:34 -0700 | [diff] [blame] | 785 | node_set_online(nid); |
| 786 | |
Yasunori Goto | 0fc4415 | 2006-06-27 02:53:38 -0700 | [diff] [blame] | 787 | if (new_pgdat) { |
| 788 | ret = register_one_node(nid); |
| 789 | /* |
| 790 | * If sysfs file of new node can't create, cpu on the node |
| 791 | * can't be hot-added. There is no rollback way now. |
| 792 | * So, check by BUG_ON() to catch it reluctantly.. |
| 793 | */ |
| 794 | BUG_ON(ret); |
| 795 | } |
| 796 | |
akpm@linux-foundation.org | d96ae53 | 2010-03-05 13:41:58 -0800 | [diff] [blame] | 797 | /* create new memmap entry */ |
| 798 | firmware_map_add_hotplug(start, start + size, "System RAM"); |
| 799 | |
Andi Kleen | 6ad696d | 2009-11-17 14:06:22 -0800 | [diff] [blame] | 800 | goto out; |
| 801 | |
Yasunori Goto | 9af3c2d | 2006-06-27 02:53:34 -0700 | [diff] [blame] | 802 | error: |
| 803 | /* rollback pgdat allocation and others */ |
| 804 | if (new_pgdat) |
| 805 | rollback_node_hotadd(nid, pgdat); |
KAMEZAWA Hiroyuki | ebd1530 | 2006-08-05 12:15:06 -0700 | [diff] [blame] | 806 | if (res) |
| 807 | release_memory_resource(res); |
Yasunori Goto | 9af3c2d | 2006-06-27 02:53:34 -0700 | [diff] [blame] | 808 | |
Andi Kleen | 6ad696d | 2009-11-17 14:06:22 -0800 | [diff] [blame] | 809 | out: |
KOSAKI Motohiro | 20d6c96 | 2010-12-02 14:31:19 -0800 | [diff] [blame] | 810 | unlock_memory_hotplug(); |
Yasunori Goto | bc02af9 | 2006-06-27 02:53:30 -0700 | [diff] [blame] | 811 | return ret; |
| 812 | } |
| 813 | EXPORT_SYMBOL_GPL(add_memory); |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 814 | |
| 815 | #ifdef CONFIG_MEMORY_HOTREMOVE |
| 816 | /* |
Badari Pulavarty | 5c755e9 | 2008-07-23 21:28:19 -0700 | [diff] [blame] | 817 | * A free page on the buddy free lists (not the per-cpu lists) has PageBuddy |
| 818 | * set and the size of the free page is given by page_order(). Using this, |
| 819 | * the function determines if the pageblock contains only free pages. |
| 820 | * Due to buddy contraints, a free page at least the size of a pageblock will |
| 821 | * be located at the start of the pageblock |
| 822 | */ |
| 823 | static inline int pageblock_free(struct page *page) |
| 824 | { |
| 825 | return PageBuddy(page) && page_order(page) >= pageblock_order; |
| 826 | } |
| 827 | |
| 828 | /* Return the start of the next active pageblock after a given page */ |
| 829 | static struct page *next_active_pageblock(struct page *page) |
| 830 | { |
Badari Pulavarty | 5c755e9 | 2008-07-23 21:28:19 -0700 | [diff] [blame] | 831 | /* Ensure the starting page is pageblock-aligned */ |
| 832 | BUG_ON(page_to_pfn(page) & (pageblock_nr_pages - 1)); |
| 833 | |
Badari Pulavarty | 5c755e9 | 2008-07-23 21:28:19 -0700 | [diff] [blame] | 834 | /* If the entire pageblock is free, move to the end of free page */ |
KAMEZAWA Hiroyuki | 0dcc48c | 2010-09-09 16:38:01 -0700 | [diff] [blame] | 835 | if (pageblock_free(page)) { |
| 836 | int order; |
| 837 | /* be careful. we don't have locks, page_order can be changed.*/ |
| 838 | order = page_order(page); |
| 839 | if ((order < MAX_ORDER) && (order >= pageblock_order)) |
| 840 | return page + (1 << order); |
| 841 | } |
Badari Pulavarty | 5c755e9 | 2008-07-23 21:28:19 -0700 | [diff] [blame] | 842 | |
KAMEZAWA Hiroyuki | 0dcc48c | 2010-09-09 16:38:01 -0700 | [diff] [blame] | 843 | return page + pageblock_nr_pages; |
Badari Pulavarty | 5c755e9 | 2008-07-23 21:28:19 -0700 | [diff] [blame] | 844 | } |
| 845 | |
| 846 | /* Checks if this range of memory is likely to be hot-removable. */ |
| 847 | int is_mem_section_removable(unsigned long start_pfn, unsigned long nr_pages) |
| 848 | { |
Badari Pulavarty | 5c755e9 | 2008-07-23 21:28:19 -0700 | [diff] [blame] | 849 | struct page *page = pfn_to_page(start_pfn); |
| 850 | struct page *end_page = page + nr_pages; |
| 851 | |
| 852 | /* Check the starting page of each pageblock within the range */ |
| 853 | for (; page < end_page; page = next_active_pageblock(page)) { |
KAMEZAWA Hiroyuki | 49ac825 | 2010-10-26 14:21:30 -0700 | [diff] [blame] | 854 | if (!is_pageblock_removable_nolock(page)) |
Badari Pulavarty | 5c755e9 | 2008-07-23 21:28:19 -0700 | [diff] [blame] | 855 | return 0; |
KAMEZAWA Hiroyuki | 49ac825 | 2010-10-26 14:21:30 -0700 | [diff] [blame] | 856 | cond_resched(); |
Badari Pulavarty | 5c755e9 | 2008-07-23 21:28:19 -0700 | [diff] [blame] | 857 | } |
| 858 | |
| 859 | /* All pageblocks in the memory block are likely to be hot-removable */ |
| 860 | return 1; |
| 861 | } |
| 862 | |
| 863 | /* |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 864 | * Confirm all pages in a range [start, end) is belongs to the same zone. |
| 865 | */ |
| 866 | static int test_pages_in_a_zone(unsigned long start_pfn, unsigned long end_pfn) |
| 867 | { |
| 868 | unsigned long pfn; |
| 869 | struct zone *zone = NULL; |
| 870 | struct page *page; |
| 871 | int i; |
| 872 | for (pfn = start_pfn; |
| 873 | pfn < end_pfn; |
| 874 | pfn += MAX_ORDER_NR_PAGES) { |
| 875 | i = 0; |
| 876 | /* This is just a CONFIG_HOLES_IN_ZONE check.*/ |
| 877 | while ((i < MAX_ORDER_NR_PAGES) && !pfn_valid_within(pfn + i)) |
| 878 | i++; |
| 879 | if (i == MAX_ORDER_NR_PAGES) |
| 880 | continue; |
| 881 | page = pfn_to_page(pfn + i); |
| 882 | if (zone && page_zone(page) != zone) |
| 883 | return 0; |
| 884 | zone = page_zone(page); |
| 885 | } |
| 886 | return 1; |
| 887 | } |
| 888 | |
| 889 | /* |
| 890 | * Scanning pfn is much easier than scanning lru list. |
| 891 | * Scan pfn from start to end and Find LRU page. |
| 892 | */ |
Andrew Morton | 7bbc090 | 2010-10-26 14:22:05 -0700 | [diff] [blame] | 893 | static unsigned long scan_lru_pages(unsigned long start, unsigned long end) |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 894 | { |
| 895 | unsigned long pfn; |
| 896 | struct page *page; |
| 897 | for (pfn = start; pfn < end; pfn++) { |
| 898 | if (pfn_valid(pfn)) { |
| 899 | page = pfn_to_page(pfn); |
| 900 | if (PageLRU(page)) |
| 901 | return pfn; |
| 902 | } |
| 903 | } |
| 904 | return 0; |
| 905 | } |
| 906 | |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 907 | #define NR_OFFLINE_AT_ONCE_PAGES (256) |
| 908 | static int |
| 909 | do_migrate_range(unsigned long start_pfn, unsigned long end_pfn) |
| 910 | { |
| 911 | unsigned long pfn; |
| 912 | struct page *page; |
| 913 | int move_pages = NR_OFFLINE_AT_ONCE_PAGES; |
| 914 | int not_managed = 0; |
| 915 | int ret = 0; |
| 916 | LIST_HEAD(source); |
| 917 | |
| 918 | for (pfn = start_pfn; pfn < end_pfn && move_pages > 0; pfn++) { |
| 919 | if (!pfn_valid(pfn)) |
| 920 | continue; |
| 921 | page = pfn_to_page(pfn); |
Konstantin Khlebnikov | 700c2a4 | 2011-05-24 17:12:19 -0700 | [diff] [blame] | 922 | if (!get_page_unless_zero(page)) |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 923 | continue; |
| 924 | /* |
| 925 | * We can skip free pages. And we can only deal with pages on |
| 926 | * LRU. |
| 927 | */ |
Nick Piggin | 62695a8 | 2008-10-18 20:26:09 -0700 | [diff] [blame] | 928 | ret = isolate_lru_page(page); |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 929 | if (!ret) { /* Success */ |
Konstantin Khlebnikov | 700c2a4 | 2011-05-24 17:12:19 -0700 | [diff] [blame] | 930 | put_page(page); |
Nick Piggin | 62695a8 | 2008-10-18 20:26:09 -0700 | [diff] [blame] | 931 | list_add_tail(&page->lru, &source); |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 932 | move_pages--; |
KOSAKI Motohiro | 6d9c285 | 2009-12-14 17:58:11 -0800 | [diff] [blame] | 933 | inc_zone_page_state(page, NR_ISOLATED_ANON + |
| 934 | page_is_file_cache(page)); |
| 935 | |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 936 | } else { |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 937 | #ifdef CONFIG_DEBUG_VM |
Wu Fengguang | 718a382 | 2010-03-10 15:20:43 -0800 | [diff] [blame] | 938 | printk(KERN_ALERT "removing pfn %lx from LRU failed\n", |
| 939 | pfn); |
| 940 | dump_page(page); |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 941 | #endif |
Konstantin Khlebnikov | 700c2a4 | 2011-05-24 17:12:19 -0700 | [diff] [blame] | 942 | put_page(page); |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 943 | /* Because we don't have big zone->lock. we should |
Bob Liu | 809c444 | 2010-10-26 14:22:10 -0700 | [diff] [blame] | 944 | check this again here. */ |
| 945 | if (page_count(page)) { |
| 946 | not_managed++; |
Bob Liu | f3ab263 | 2010-10-26 14:22:10 -0700 | [diff] [blame] | 947 | ret = -EBUSY; |
Bob Liu | 809c444 | 2010-10-26 14:22:10 -0700 | [diff] [blame] | 948 | break; |
| 949 | } |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 950 | } |
| 951 | } |
Bob Liu | f3ab263 | 2010-10-26 14:22:10 -0700 | [diff] [blame] | 952 | if (!list_empty(&source)) { |
| 953 | if (not_managed) { |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 954 | putback_lru_pages(&source); |
Bob Liu | f3ab263 | 2010-10-26 14:22:10 -0700 | [diff] [blame] | 955 | goto out; |
| 956 | } |
Minchan Kim | 74c08f9 | 2012-10-08 16:32:54 -0700 | [diff] [blame] | 957 | |
| 958 | /* |
| 959 | * alloc_migrate_target should be improooooved!! |
| 960 | * migrate_pages returns # of failed pages. |
| 961 | */ |
| 962 | ret = migrate_pages(&source, alloc_migrate_target, 0, |
Mel Gorman | a6bc32b | 2012-01-12 17:19:43 -0800 | [diff] [blame] | 963 | true, MIGRATE_SYNC); |
Bob Liu | f3ab263 | 2010-10-26 14:22:10 -0700 | [diff] [blame] | 964 | if (ret) |
| 965 | putback_lru_pages(&source); |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 966 | } |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 967 | out: |
| 968 | return ret; |
| 969 | } |
| 970 | |
| 971 | /* |
| 972 | * remove from free_area[] and mark all as Reserved. |
| 973 | */ |
| 974 | static int |
| 975 | offline_isolated_pages_cb(unsigned long start, unsigned long nr_pages, |
| 976 | void *data) |
| 977 | { |
| 978 | __offline_isolated_pages(start, start + nr_pages); |
| 979 | return 0; |
| 980 | } |
| 981 | |
| 982 | static void |
| 983 | offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn) |
| 984 | { |
KAMEZAWA Hiroyuki | 908eedc | 2009-09-22 16:45:46 -0700 | [diff] [blame] | 985 | walk_system_ram_range(start_pfn, end_pfn - start_pfn, NULL, |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 986 | offline_isolated_pages_cb); |
| 987 | } |
| 988 | |
| 989 | /* |
| 990 | * Check all pages in range, recoreded as memory resource, are isolated. |
| 991 | */ |
| 992 | static int |
| 993 | check_pages_isolated_cb(unsigned long start_pfn, unsigned long nr_pages, |
| 994 | void *data) |
| 995 | { |
| 996 | int ret; |
| 997 | long offlined = *(long *)data; |
Wen Congyang | b023f46 | 2012-12-11 16:00:45 -0800 | [diff] [blame] | 998 | ret = test_pages_isolated(start_pfn, start_pfn + nr_pages, true); |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 999 | offlined = nr_pages; |
| 1000 | if (!ret) |
| 1001 | *(long *)data += offlined; |
| 1002 | return ret; |
| 1003 | } |
| 1004 | |
| 1005 | static long |
| 1006 | check_pages_isolated(unsigned long start_pfn, unsigned long end_pfn) |
| 1007 | { |
| 1008 | long offlined = 0; |
| 1009 | int ret; |
| 1010 | |
KAMEZAWA Hiroyuki | 908eedc | 2009-09-22 16:45:46 -0700 | [diff] [blame] | 1011 | ret = walk_system_ram_range(start_pfn, end_pfn - start_pfn, &offlined, |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 1012 | check_pages_isolated_cb); |
| 1013 | if (ret < 0) |
| 1014 | offlined = (long)ret; |
| 1015 | return offlined; |
| 1016 | } |
| 1017 | |
Lai Jiangshan | d971367 | 2012-12-11 16:01:03 -0800 | [diff] [blame] | 1018 | /* check which state of node_states will be changed when offline memory */ |
| 1019 | static void node_states_check_changes_offline(unsigned long nr_pages, |
| 1020 | struct zone *zone, struct memory_notify *arg) |
| 1021 | { |
| 1022 | struct pglist_data *pgdat = zone->zone_pgdat; |
| 1023 | unsigned long present_pages = 0; |
| 1024 | enum zone_type zt, zone_last = ZONE_NORMAL; |
| 1025 | |
| 1026 | /* |
| 1027 | * If we have HIGHMEM, node_states[N_NORMAL_MEMORY] contains nodes |
| 1028 | * which have 0...ZONE_NORMAL, set zone_last to ZONE_NORMAL. |
| 1029 | * |
| 1030 | * If we don't have HIGHMEM, node_states[N_NORMAL_MEMORY] contains nodes |
| 1031 | * which have 0...ZONE_MOVABLE, set zone_last to ZONE_MOVABLE. |
| 1032 | */ |
| 1033 | if (N_HIGH_MEMORY == N_NORMAL_MEMORY) |
| 1034 | zone_last = ZONE_MOVABLE; |
| 1035 | |
| 1036 | /* |
| 1037 | * check whether node_states[N_NORMAL_MEMORY] will be changed. |
| 1038 | * If the memory to be offline is in a zone of 0...zone_last, |
| 1039 | * and it is the last present memory, 0...zone_last will |
| 1040 | * become empty after offline , thus we can determind we will |
| 1041 | * need to clear the node from node_states[N_NORMAL_MEMORY]. |
| 1042 | */ |
| 1043 | for (zt = 0; zt <= zone_last; zt++) |
| 1044 | present_pages += pgdat->node_zones[zt].present_pages; |
| 1045 | if (zone_idx(zone) <= zone_last && nr_pages >= present_pages) |
| 1046 | arg->status_change_nid_normal = zone_to_nid(zone); |
| 1047 | else |
| 1048 | arg->status_change_nid_normal = -1; |
| 1049 | |
| 1050 | /* |
| 1051 | * node_states[N_HIGH_MEMORY] contains nodes which have 0...ZONE_MOVABLE |
| 1052 | */ |
| 1053 | zone_last = ZONE_MOVABLE; |
| 1054 | |
| 1055 | /* |
| 1056 | * check whether node_states[N_HIGH_MEMORY] will be changed |
| 1057 | * If we try to offline the last present @nr_pages from the node, |
| 1058 | * we can determind we will need to clear the node from |
| 1059 | * node_states[N_HIGH_MEMORY]. |
| 1060 | */ |
| 1061 | for (; zt <= zone_last; zt++) |
| 1062 | present_pages += pgdat->node_zones[zt].present_pages; |
| 1063 | if (nr_pages >= present_pages) |
| 1064 | arg->status_change_nid = zone_to_nid(zone); |
| 1065 | else |
| 1066 | arg->status_change_nid = -1; |
| 1067 | } |
| 1068 | |
| 1069 | static void node_states_clear_node(int node, struct memory_notify *arg) |
| 1070 | { |
| 1071 | if (arg->status_change_nid_normal >= 0) |
| 1072 | node_clear_state(node, N_NORMAL_MEMORY); |
| 1073 | |
| 1074 | if ((N_HIGH_MEMORY != N_NORMAL_MEMORY) && |
| 1075 | (arg->status_change_nid >= 0)) |
| 1076 | node_clear_state(node, N_HIGH_MEMORY); |
| 1077 | } |
| 1078 | |
Wen Congyang | a16cee1 | 2012-10-08 16:33:58 -0700 | [diff] [blame] | 1079 | static int __ref __offline_pages(unsigned long start_pfn, |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 1080 | unsigned long end_pfn, unsigned long timeout) |
| 1081 | { |
| 1082 | unsigned long pfn, nr_pages, expire; |
| 1083 | long offlined_pages; |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 1084 | int ret, drain, retry_max, node; |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 1085 | struct zone *zone; |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 1086 | struct memory_notify arg; |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 1087 | |
| 1088 | BUG_ON(start_pfn >= end_pfn); |
| 1089 | /* at least, alignment against pageblock is necessary */ |
| 1090 | if (!IS_ALIGNED(start_pfn, pageblock_nr_pages)) |
| 1091 | return -EINVAL; |
| 1092 | if (!IS_ALIGNED(end_pfn, pageblock_nr_pages)) |
| 1093 | return -EINVAL; |
| 1094 | /* This makes hotplug much easier...and readable. |
| 1095 | we assume this for now. .*/ |
| 1096 | if (!test_pages_in_a_zone(start_pfn, end_pfn)) |
| 1097 | return -EINVAL; |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 1098 | |
KOSAKI Motohiro | 20d6c96 | 2010-12-02 14:31:19 -0800 | [diff] [blame] | 1099 | lock_memory_hotplug(); |
Andi Kleen | 6ad696d | 2009-11-17 14:06:22 -0800 | [diff] [blame] | 1100 | |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 1101 | zone = page_zone(pfn_to_page(start_pfn)); |
| 1102 | node = zone_to_nid(zone); |
| 1103 | nr_pages = end_pfn - start_pfn; |
| 1104 | |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 1105 | /* set above range as isolated */ |
Wen Congyang | b023f46 | 2012-12-11 16:00:45 -0800 | [diff] [blame] | 1106 | ret = start_isolate_page_range(start_pfn, end_pfn, |
| 1107 | MIGRATE_MOVABLE, true); |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 1108 | if (ret) |
Andi Kleen | 6ad696d | 2009-11-17 14:06:22 -0800 | [diff] [blame] | 1109 | goto out; |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 1110 | |
| 1111 | arg.start_pfn = start_pfn; |
| 1112 | arg.nr_pages = nr_pages; |
Lai Jiangshan | d971367 | 2012-12-11 16:01:03 -0800 | [diff] [blame] | 1113 | node_states_check_changes_offline(nr_pages, zone, &arg); |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 1114 | |
| 1115 | ret = memory_notify(MEM_GOING_OFFLINE, &arg); |
| 1116 | ret = notifier_to_errno(ret); |
| 1117 | if (ret) |
| 1118 | goto failed_removal; |
| 1119 | |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 1120 | pfn = start_pfn; |
| 1121 | expire = jiffies + timeout; |
| 1122 | drain = 0; |
| 1123 | retry_max = 5; |
| 1124 | repeat: |
| 1125 | /* start memory hot removal */ |
| 1126 | ret = -EAGAIN; |
| 1127 | if (time_after(jiffies, expire)) |
| 1128 | goto failed_removal; |
| 1129 | ret = -EINTR; |
| 1130 | if (signal_pending(current)) |
| 1131 | goto failed_removal; |
| 1132 | ret = 0; |
| 1133 | if (drain) { |
| 1134 | lru_add_drain_all(); |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 1135 | cond_resched(); |
Christoph Lameter | 9f8f217 | 2008-02-04 22:29:11 -0800 | [diff] [blame] | 1136 | drain_all_pages(); |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 1137 | } |
| 1138 | |
| 1139 | pfn = scan_lru_pages(start_pfn, end_pfn); |
| 1140 | if (pfn) { /* We have page on LRU */ |
| 1141 | ret = do_migrate_range(pfn, end_pfn); |
| 1142 | if (!ret) { |
| 1143 | drain = 1; |
| 1144 | goto repeat; |
| 1145 | } else { |
| 1146 | if (ret < 0) |
| 1147 | if (--retry_max == 0) |
| 1148 | goto failed_removal; |
| 1149 | yield(); |
| 1150 | drain = 1; |
| 1151 | goto repeat; |
| 1152 | } |
| 1153 | } |
| 1154 | /* drain all zone's lru pagevec, this is asyncronous... */ |
| 1155 | lru_add_drain_all(); |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 1156 | yield(); |
| 1157 | /* drain pcp pages , this is synchrouns. */ |
Christoph Lameter | 9f8f217 | 2008-02-04 22:29:11 -0800 | [diff] [blame] | 1158 | drain_all_pages(); |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 1159 | /* check again */ |
| 1160 | offlined_pages = check_pages_isolated(start_pfn, end_pfn); |
| 1161 | if (offlined_pages < 0) { |
| 1162 | ret = -EBUSY; |
| 1163 | goto failed_removal; |
| 1164 | } |
| 1165 | printk(KERN_INFO "Offlined Pages %ld\n", offlined_pages); |
| 1166 | /* Ok, all of our target is islaoted. |
| 1167 | We cannot do rollback at this point. */ |
| 1168 | offline_isolated_pages(start_pfn, end_pfn); |
KAMEZAWA Hiroyuki | dbc0e4c | 2007-11-14 16:59:12 -0800 | [diff] [blame] | 1169 | /* reset pagetype flags and makes migrate type to be MOVABLE */ |
Michal Nazarewicz | 0815f3d | 2012-04-03 15:06:15 +0200 | [diff] [blame] | 1170 | undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE); |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 1171 | /* removal success */ |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 1172 | zone->present_pages -= offlined_pages; |
| 1173 | zone->zone_pgdat->node_present_pages -= offlined_pages; |
| 1174 | totalram_pages -= offlined_pages; |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 1175 | |
KOSAKI Motohiro | 1b79acc | 2011-05-24 17:11:32 -0700 | [diff] [blame] | 1176 | init_per_zone_wmark_min(); |
| 1177 | |
Xishi Qiu | 1e8537b | 2012-10-08 16:31:51 -0700 | [diff] [blame] | 1178 | if (!populated_zone(zone)) { |
Jiang Liu | 340175b | 2012-07-31 16:43:32 -0700 | [diff] [blame] | 1179 | zone_pcp_reset(zone); |
Xishi Qiu | 1e8537b | 2012-10-08 16:31:51 -0700 | [diff] [blame] | 1180 | mutex_lock(&zonelists_mutex); |
| 1181 | build_all_zonelists(NULL, NULL); |
| 1182 | mutex_unlock(&zonelists_mutex); |
| 1183 | } else |
| 1184 | zone_pcp_update(zone); |
Jiang Liu | 340175b | 2012-07-31 16:43:32 -0700 | [diff] [blame] | 1185 | |
Lai Jiangshan | d971367 | 2012-12-11 16:01:03 -0800 | [diff] [blame] | 1186 | node_states_clear_node(node, &arg); |
| 1187 | if (arg.status_change_nid >= 0) |
David Rientjes | 8fe23e0 | 2009-12-14 17:58:33 -0800 | [diff] [blame] | 1188 | kswapd_stop(node); |
Minchan Kim | bce7394 | 2009-06-16 15:32:50 -0700 | [diff] [blame] | 1189 | |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 1190 | vm_total_pages = nr_free_pagecache_pages(); |
| 1191 | writeback_set_ratelimit(); |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 1192 | |
| 1193 | memory_notify(MEM_OFFLINE, &arg); |
KOSAKI Motohiro | 20d6c96 | 2010-12-02 14:31:19 -0800 | [diff] [blame] | 1194 | unlock_memory_hotplug(); |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 1195 | return 0; |
| 1196 | |
| 1197 | failed_removal: |
Bjorn Helgaas | a62e2f4 | 2012-05-29 15:06:30 -0700 | [diff] [blame] | 1198 | printk(KERN_INFO "memory offlining [mem %#010llx-%#010llx] failed\n", |
| 1199 | (unsigned long long) start_pfn << PAGE_SHIFT, |
| 1200 | ((unsigned long long) end_pfn << PAGE_SHIFT) - 1); |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 1201 | memory_notify(MEM_CANCEL_OFFLINE, &arg); |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 1202 | /* pushback to free area */ |
Michal Nazarewicz | 0815f3d | 2012-04-03 15:06:15 +0200 | [diff] [blame] | 1203 | undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE); |
Yasunori Goto | 7b78d33 | 2007-10-21 16:41:36 -0700 | [diff] [blame] | 1204 | |
Andi Kleen | 6ad696d | 2009-11-17 14:06:22 -0800 | [diff] [blame] | 1205 | out: |
KOSAKI Motohiro | 20d6c96 | 2010-12-02 14:31:19 -0800 | [diff] [blame] | 1206 | unlock_memory_hotplug(); |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 1207 | return ret; |
| 1208 | } |
Badari Pulavarty | 7108878 | 2008-10-18 20:25:58 -0700 | [diff] [blame] | 1209 | |
Wen Congyang | a16cee1 | 2012-10-08 16:33:58 -0700 | [diff] [blame] | 1210 | int offline_pages(unsigned long start_pfn, unsigned long nr_pages) |
| 1211 | { |
| 1212 | return __offline_pages(start_pfn, start_pfn + nr_pages, 120 * HZ); |
| 1213 | } |
| 1214 | |
Badari Pulavarty | 7108878 | 2008-10-18 20:25:58 -0700 | [diff] [blame] | 1215 | int remove_memory(u64 start, u64 size) |
| 1216 | { |
Wen Congyang | e90bdb7 | 2012-10-08 16:34:01 -0700 | [diff] [blame] | 1217 | struct memory_block *mem = NULL; |
| 1218 | struct mem_section *section; |
Badari Pulavarty | 7108878 | 2008-10-18 20:25:58 -0700 | [diff] [blame] | 1219 | unsigned long start_pfn, end_pfn; |
Wen Congyang | e90bdb7 | 2012-10-08 16:34:01 -0700 | [diff] [blame] | 1220 | unsigned long pfn, section_nr; |
| 1221 | int ret; |
Badari Pulavarty | 7108878 | 2008-10-18 20:25:58 -0700 | [diff] [blame] | 1222 | |
| 1223 | start_pfn = PFN_DOWN(start); |
| 1224 | end_pfn = start_pfn + PFN_DOWN(size); |
Wen Congyang | e90bdb7 | 2012-10-08 16:34:01 -0700 | [diff] [blame] | 1225 | |
| 1226 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { |
| 1227 | section_nr = pfn_to_section_nr(pfn); |
| 1228 | if (!present_section_nr(section_nr)) |
| 1229 | continue; |
| 1230 | |
| 1231 | section = __nr_to_section(section_nr); |
| 1232 | /* same memblock? */ |
| 1233 | if (mem) |
| 1234 | if ((section_nr >= mem->start_section_nr) && |
| 1235 | (section_nr <= mem->end_section_nr)) |
| 1236 | continue; |
| 1237 | |
| 1238 | mem = find_memory_block_hinted(section, mem); |
| 1239 | if (!mem) |
| 1240 | continue; |
| 1241 | |
| 1242 | ret = offline_memory_block(mem); |
| 1243 | if (ret) { |
| 1244 | kobject_put(&mem->dev.kobj); |
| 1245 | return ret; |
| 1246 | } |
| 1247 | } |
| 1248 | |
| 1249 | if (mem) |
| 1250 | kobject_put(&mem->dev.kobj); |
| 1251 | |
| 1252 | return 0; |
Badari Pulavarty | 7108878 | 2008-10-18 20:25:58 -0700 | [diff] [blame] | 1253 | } |
KAMEZAWA Hiroyuki | 48e9419 | 2007-10-16 01:26:14 -0700 | [diff] [blame] | 1254 | #else |
Wen Congyang | a16cee1 | 2012-10-08 16:33:58 -0700 | [diff] [blame] | 1255 | int offline_pages(unsigned long start_pfn, unsigned long nr_pages) |
| 1256 | { |
| 1257 | return -EINVAL; |
| 1258 | } |
KAMEZAWA Hiroyuki | 48e9419 | 2007-10-16 01:26:14 -0700 | [diff] [blame] | 1259 | int remove_memory(u64 start, u64 size) |
| 1260 | { |
| 1261 | return -EINVAL; |
| 1262 | } |
KAMEZAWA Hiroyuki | 0c0e619 | 2007-10-16 01:26:12 -0700 | [diff] [blame] | 1263 | #endif /* CONFIG_MEMORY_HOTREMOVE */ |
Badari Pulavarty | 7108878 | 2008-10-18 20:25:58 -0700 | [diff] [blame] | 1264 | EXPORT_SYMBOL_GPL(remove_memory); |