| 1 | /* |
| 2 | * Basic Node interface support |
| 3 | */ |
| 4 | |
| 5 | #include <linux/module.h> |
| 6 | #include <linux/init.h> |
| 7 | #include <linux/mm.h> |
| 8 | #include <linux/memory.h> |
| 9 | #include <linux/vmstat.h> |
| 10 | #include <linux/node.h> |
| 11 | #include <linux/hugetlb.h> |
| 12 | #include <linux/compaction.h> |
| 13 | #include <linux/cpumask.h> |
| 14 | #include <linux/topology.h> |
| 15 | #include <linux/nodemask.h> |
| 16 | #include <linux/cpu.h> |
| 17 | #include <linux/device.h> |
| 18 | #include <linux/swap.h> |
| 19 | #include <linux/slab.h> |
| 20 | |
| 21 | static struct bus_type node_subsys = { |
| 22 | .name = "node", |
| 23 | .dev_name = "node", |
| 24 | }; |
| 25 | |
| 26 | |
| 27 | static ssize_t node_read_cpumap(struct device *dev, int type, char *buf) |
| 28 | { |
| 29 | struct node *node_dev = to_node(dev); |
| 30 | const struct cpumask *mask = cpumask_of_node(node_dev->dev.id); |
| 31 | int len; |
| 32 | |
| 33 | /* 2008/04/07: buf currently PAGE_SIZE, need 9 chars per 32 bits. */ |
| 34 | BUILD_BUG_ON((NR_CPUS/32 * 9) > (PAGE_SIZE-1)); |
| 35 | |
| 36 | len = type? |
| 37 | cpulist_scnprintf(buf, PAGE_SIZE-2, mask) : |
| 38 | cpumask_scnprintf(buf, PAGE_SIZE-2, mask); |
| 39 | buf[len++] = '\n'; |
| 40 | buf[len] = '\0'; |
| 41 | return len; |
| 42 | } |
| 43 | |
| 44 | static inline ssize_t node_read_cpumask(struct device *dev, |
| 45 | struct device_attribute *attr, char *buf) |
| 46 | { |
| 47 | return node_read_cpumap(dev, 0, buf); |
| 48 | } |
| 49 | static inline ssize_t node_read_cpulist(struct device *dev, |
| 50 | struct device_attribute *attr, char *buf) |
| 51 | { |
| 52 | return node_read_cpumap(dev, 1, buf); |
| 53 | } |
| 54 | |
| 55 | static DEVICE_ATTR(cpumap, S_IRUGO, node_read_cpumask, NULL); |
| 56 | static DEVICE_ATTR(cpulist, S_IRUGO, node_read_cpulist, NULL); |
| 57 | |
| 58 | #define K(x) ((x) << (PAGE_SHIFT - 10)) |
| 59 | static ssize_t node_read_meminfo(struct device *dev, |
| 60 | struct device_attribute *attr, char *buf) |
| 61 | { |
| 62 | int n; |
| 63 | int nid = dev->id; |
| 64 | struct sysinfo i; |
| 65 | |
| 66 | si_meminfo_node(&i, nid); |
| 67 | n = sprintf(buf, |
| 68 | "Node %d MemTotal: %8lu kB\n" |
| 69 | "Node %d MemFree: %8lu kB\n" |
| 70 | "Node %d MemUsed: %8lu kB\n" |
| 71 | "Node %d Active: %8lu kB\n" |
| 72 | "Node %d Inactive: %8lu kB\n" |
| 73 | "Node %d Active(anon): %8lu kB\n" |
| 74 | "Node %d Inactive(anon): %8lu kB\n" |
| 75 | "Node %d Active(file): %8lu kB\n" |
| 76 | "Node %d Inactive(file): %8lu kB\n" |
| 77 | "Node %d Unevictable: %8lu kB\n" |
| 78 | "Node %d Mlocked: %8lu kB\n", |
| 79 | nid, K(i.totalram), |
| 80 | nid, K(i.freeram), |
| 81 | nid, K(i.totalram - i.freeram), |
| 82 | nid, K(node_page_state(nid, NR_ACTIVE_ANON) + |
| 83 | node_page_state(nid, NR_ACTIVE_FILE)), |
| 84 | nid, K(node_page_state(nid, NR_INACTIVE_ANON) + |
| 85 | node_page_state(nid, NR_INACTIVE_FILE)), |
| 86 | nid, K(node_page_state(nid, NR_ACTIVE_ANON)), |
| 87 | nid, K(node_page_state(nid, NR_INACTIVE_ANON)), |
| 88 | nid, K(node_page_state(nid, NR_ACTIVE_FILE)), |
| 89 | nid, K(node_page_state(nid, NR_INACTIVE_FILE)), |
| 90 | nid, K(node_page_state(nid, NR_UNEVICTABLE)), |
| 91 | nid, K(node_page_state(nid, NR_MLOCK))); |
| 92 | |
| 93 | #ifdef CONFIG_HIGHMEM |
| 94 | n += sprintf(buf + n, |
| 95 | "Node %d HighTotal: %8lu kB\n" |
| 96 | "Node %d HighFree: %8lu kB\n" |
| 97 | "Node %d LowTotal: %8lu kB\n" |
| 98 | "Node %d LowFree: %8lu kB\n", |
| 99 | nid, K(i.totalhigh), |
| 100 | nid, K(i.freehigh), |
| 101 | nid, K(i.totalram - i.totalhigh), |
| 102 | nid, K(i.freeram - i.freehigh)); |
| 103 | #endif |
| 104 | n += sprintf(buf + n, |
| 105 | "Node %d Dirty: %8lu kB\n" |
| 106 | "Node %d Writeback: %8lu kB\n" |
| 107 | "Node %d FilePages: %8lu kB\n" |
| 108 | "Node %d Mapped: %8lu kB\n" |
| 109 | "Node %d AnonPages: %8lu kB\n" |
| 110 | "Node %d Shmem: %8lu kB\n" |
| 111 | "Node %d KernelStack: %8lu kB\n" |
| 112 | "Node %d PageTables: %8lu kB\n" |
| 113 | "Node %d NFS_Unstable: %8lu kB\n" |
| 114 | "Node %d Bounce: %8lu kB\n" |
| 115 | "Node %d WritebackTmp: %8lu kB\n" |
| 116 | "Node %d Slab: %8lu kB\n" |
| 117 | "Node %d SReclaimable: %8lu kB\n" |
| 118 | "Node %d SUnreclaim: %8lu kB\n" |
| 119 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
| 120 | "Node %d AnonHugePages: %8lu kB\n" |
| 121 | #endif |
| 122 | , |
| 123 | nid, K(node_page_state(nid, NR_FILE_DIRTY)), |
| 124 | nid, K(node_page_state(nid, NR_WRITEBACK)), |
| 125 | nid, K(node_page_state(nid, NR_FILE_PAGES)), |
| 126 | nid, K(node_page_state(nid, NR_FILE_MAPPED)), |
| 127 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
| 128 | nid, K(node_page_state(nid, NR_ANON_PAGES) |
| 129 | + node_page_state(nid, NR_ANON_TRANSPARENT_HUGEPAGES) * |
| 130 | HPAGE_PMD_NR), |
| 131 | #else |
| 132 | nid, K(node_page_state(nid, NR_ANON_PAGES)), |
| 133 | #endif |
| 134 | nid, K(node_page_state(nid, NR_SHMEM)), |
| 135 | nid, node_page_state(nid, NR_KERNEL_STACK) * |
| 136 | THREAD_SIZE / 1024, |
| 137 | nid, K(node_page_state(nid, NR_PAGETABLE)), |
| 138 | nid, K(node_page_state(nid, NR_UNSTABLE_NFS)), |
| 139 | nid, K(node_page_state(nid, NR_BOUNCE)), |
| 140 | nid, K(node_page_state(nid, NR_WRITEBACK_TEMP)), |
| 141 | nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE) + |
| 142 | node_page_state(nid, NR_SLAB_UNRECLAIMABLE)), |
| 143 | nid, K(node_page_state(nid, NR_SLAB_RECLAIMABLE)), |
| 144 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
| 145 | nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE)) |
| 146 | , nid, |
| 147 | K(node_page_state(nid, NR_ANON_TRANSPARENT_HUGEPAGES) * |
| 148 | HPAGE_PMD_NR)); |
| 149 | #else |
| 150 | nid, K(node_page_state(nid, NR_SLAB_UNRECLAIMABLE))); |
| 151 | #endif |
| 152 | n += hugetlb_report_node_meminfo(nid, buf + n); |
| 153 | return n; |
| 154 | } |
| 155 | |
| 156 | #undef K |
| 157 | static DEVICE_ATTR(meminfo, S_IRUGO, node_read_meminfo, NULL); |
| 158 | |
| 159 | static ssize_t node_read_numastat(struct device *dev, |
| 160 | struct device_attribute *attr, char *buf) |
| 161 | { |
| 162 | return sprintf(buf, |
| 163 | "numa_hit %lu\n" |
| 164 | "numa_miss %lu\n" |
| 165 | "numa_foreign %lu\n" |
| 166 | "interleave_hit %lu\n" |
| 167 | "local_node %lu\n" |
| 168 | "other_node %lu\n", |
| 169 | node_page_state(dev->id, NUMA_HIT), |
| 170 | node_page_state(dev->id, NUMA_MISS), |
| 171 | node_page_state(dev->id, NUMA_FOREIGN), |
| 172 | node_page_state(dev->id, NUMA_INTERLEAVE_HIT), |
| 173 | node_page_state(dev->id, NUMA_LOCAL), |
| 174 | node_page_state(dev->id, NUMA_OTHER)); |
| 175 | } |
| 176 | static DEVICE_ATTR(numastat, S_IRUGO, node_read_numastat, NULL); |
| 177 | |
| 178 | static ssize_t node_read_vmstat(struct device *dev, |
| 179 | struct device_attribute *attr, char *buf) |
| 180 | { |
| 181 | int nid = dev->id; |
| 182 | int i; |
| 183 | int n = 0; |
| 184 | |
| 185 | for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) |
| 186 | n += sprintf(buf+n, "%s %lu\n", vmstat_text[i], |
| 187 | node_page_state(nid, i)); |
| 188 | |
| 189 | return n; |
| 190 | } |
| 191 | static DEVICE_ATTR(vmstat, S_IRUGO, node_read_vmstat, NULL); |
| 192 | |
| 193 | static ssize_t node_read_distance(struct device *dev, |
| 194 | struct device_attribute *attr, char * buf) |
| 195 | { |
| 196 | int nid = dev->id; |
| 197 | int len = 0; |
| 198 | int i; |
| 199 | |
| 200 | /* |
| 201 | * buf is currently PAGE_SIZE in length and each node needs 4 chars |
| 202 | * at the most (distance + space or newline). |
| 203 | */ |
| 204 | BUILD_BUG_ON(MAX_NUMNODES * 4 > PAGE_SIZE); |
| 205 | |
| 206 | for_each_online_node(i) |
| 207 | len += sprintf(buf + len, "%s%d", i ? " " : "", node_distance(nid, i)); |
| 208 | |
| 209 | len += sprintf(buf + len, "\n"); |
| 210 | return len; |
| 211 | } |
| 212 | static DEVICE_ATTR(distance, S_IRUGO, node_read_distance, NULL); |
| 213 | |
| 214 | #ifdef CONFIG_HUGETLBFS |
| 215 | /* |
| 216 | * hugetlbfs per node attributes registration interface: |
| 217 | * When/if hugetlb[fs] subsystem initializes [sometime after this module], |
| 218 | * it will register its per node attributes for all online nodes with |
| 219 | * memory. It will also call register_hugetlbfs_with_node(), below, to |
| 220 | * register its attribute registration functions with this node driver. |
| 221 | * Once these hooks have been initialized, the node driver will call into |
| 222 | * the hugetlb module to [un]register attributes for hot-plugged nodes. |
| 223 | */ |
| 224 | static node_registration_func_t __hugetlb_register_node; |
| 225 | static node_registration_func_t __hugetlb_unregister_node; |
| 226 | |
| 227 | static inline bool hugetlb_register_node(struct node *node) |
| 228 | { |
| 229 | if (__hugetlb_register_node && |
| 230 | node_state(node->dev.id, N_HIGH_MEMORY)) { |
| 231 | __hugetlb_register_node(node); |
| 232 | return true; |
| 233 | } |
| 234 | return false; |
| 235 | } |
| 236 | |
| 237 | static inline void hugetlb_unregister_node(struct node *node) |
| 238 | { |
| 239 | if (__hugetlb_unregister_node) |
| 240 | __hugetlb_unregister_node(node); |
| 241 | } |
| 242 | |
| 243 | void register_hugetlbfs_with_node(node_registration_func_t doregister, |
| 244 | node_registration_func_t unregister) |
| 245 | { |
| 246 | __hugetlb_register_node = doregister; |
| 247 | __hugetlb_unregister_node = unregister; |
| 248 | } |
| 249 | #else |
| 250 | static inline void hugetlb_register_node(struct node *node) {} |
| 251 | |
| 252 | static inline void hugetlb_unregister_node(struct node *node) {} |
| 253 | #endif |
| 254 | |
| 255 | |
| 256 | /* |
| 257 | * register_node - Setup a sysfs device for a node. |
| 258 | * @num - Node number to use when creating the device. |
| 259 | * |
| 260 | * Initialize and register the node device. |
| 261 | */ |
| 262 | int register_node(struct node *node, int num, struct node *parent) |
| 263 | { |
| 264 | int error; |
| 265 | |
| 266 | node->dev.id = num; |
| 267 | node->dev.bus = &node_subsys; |
| 268 | error = device_register(&node->dev); |
| 269 | |
| 270 | if (!error){ |
| 271 | device_create_file(&node->dev, &dev_attr_cpumap); |
| 272 | device_create_file(&node->dev, &dev_attr_cpulist); |
| 273 | device_create_file(&node->dev, &dev_attr_meminfo); |
| 274 | device_create_file(&node->dev, &dev_attr_numastat); |
| 275 | device_create_file(&node->dev, &dev_attr_distance); |
| 276 | device_create_file(&node->dev, &dev_attr_vmstat); |
| 277 | |
| 278 | scan_unevictable_register_node(node); |
| 279 | |
| 280 | hugetlb_register_node(node); |
| 281 | |
| 282 | compaction_register_node(node); |
| 283 | } |
| 284 | return error; |
| 285 | } |
| 286 | |
| 287 | /** |
| 288 | * unregister_node - unregister a node device |
| 289 | * @node: node going away |
| 290 | * |
| 291 | * Unregisters a node device @node. All the devices on the node must be |
| 292 | * unregistered before calling this function. |
| 293 | */ |
| 294 | void unregister_node(struct node *node) |
| 295 | { |
| 296 | device_remove_file(&node->dev, &dev_attr_cpumap); |
| 297 | device_remove_file(&node->dev, &dev_attr_cpulist); |
| 298 | device_remove_file(&node->dev, &dev_attr_meminfo); |
| 299 | device_remove_file(&node->dev, &dev_attr_numastat); |
| 300 | device_remove_file(&node->dev, &dev_attr_distance); |
| 301 | device_remove_file(&node->dev, &dev_attr_vmstat); |
| 302 | |
| 303 | scan_unevictable_unregister_node(node); |
| 304 | hugetlb_unregister_node(node); /* no-op, if memoryless node */ |
| 305 | |
| 306 | device_unregister(&node->dev); |
| 307 | } |
| 308 | |
| 309 | struct node node_devices[MAX_NUMNODES]; |
| 310 | |
| 311 | /* |
| 312 | * register cpu under node |
| 313 | */ |
| 314 | int register_cpu_under_node(unsigned int cpu, unsigned int nid) |
| 315 | { |
| 316 | int ret; |
| 317 | struct device *obj; |
| 318 | |
| 319 | if (!node_online(nid)) |
| 320 | return 0; |
| 321 | |
| 322 | obj = get_cpu_device(cpu); |
| 323 | if (!obj) |
| 324 | return 0; |
| 325 | |
| 326 | ret = sysfs_create_link(&node_devices[nid].dev.kobj, |
| 327 | &obj->kobj, |
| 328 | kobject_name(&obj->kobj)); |
| 329 | if (ret) |
| 330 | return ret; |
| 331 | |
| 332 | return sysfs_create_link(&obj->kobj, |
| 333 | &node_devices[nid].dev.kobj, |
| 334 | kobject_name(&node_devices[nid].dev.kobj)); |
| 335 | } |
| 336 | |
| 337 | int unregister_cpu_under_node(unsigned int cpu, unsigned int nid) |
| 338 | { |
| 339 | struct device *obj; |
| 340 | |
| 341 | if (!node_online(nid)) |
| 342 | return 0; |
| 343 | |
| 344 | obj = get_cpu_device(cpu); |
| 345 | if (!obj) |
| 346 | return 0; |
| 347 | |
| 348 | sysfs_remove_link(&node_devices[nid].dev.kobj, |
| 349 | kobject_name(&obj->kobj)); |
| 350 | sysfs_remove_link(&obj->kobj, |
| 351 | kobject_name(&node_devices[nid].dev.kobj)); |
| 352 | |
| 353 | return 0; |
| 354 | } |
| 355 | |
| 356 | #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE |
| 357 | #define page_initialized(page) (page->lru.next) |
| 358 | |
| 359 | static int get_nid_for_pfn(unsigned long pfn) |
| 360 | { |
| 361 | struct page *page; |
| 362 | |
| 363 | if (!pfn_valid_within(pfn)) |
| 364 | return -1; |
| 365 | page = pfn_to_page(pfn); |
| 366 | if (!page_initialized(page)) |
| 367 | return -1; |
| 368 | return pfn_to_nid(pfn); |
| 369 | } |
| 370 | |
| 371 | /* register memory section under specified node if it spans that node */ |
| 372 | int register_mem_sect_under_node(struct memory_block *mem_blk, int nid) |
| 373 | { |
| 374 | int ret; |
| 375 | unsigned long pfn, sect_start_pfn, sect_end_pfn; |
| 376 | |
| 377 | if (!mem_blk) |
| 378 | return -EFAULT; |
| 379 | if (!node_online(nid)) |
| 380 | return 0; |
| 381 | |
| 382 | sect_start_pfn = section_nr_to_pfn(mem_blk->start_section_nr); |
| 383 | sect_end_pfn = section_nr_to_pfn(mem_blk->end_section_nr); |
| 384 | sect_end_pfn += PAGES_PER_SECTION - 1; |
| 385 | for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) { |
| 386 | int page_nid; |
| 387 | |
| 388 | page_nid = get_nid_for_pfn(pfn); |
| 389 | if (page_nid < 0) |
| 390 | continue; |
| 391 | if (page_nid != nid) |
| 392 | continue; |
| 393 | ret = sysfs_create_link_nowarn(&node_devices[nid].dev.kobj, |
| 394 | &mem_blk->dev.kobj, |
| 395 | kobject_name(&mem_blk->dev.kobj)); |
| 396 | if (ret) |
| 397 | return ret; |
| 398 | |
| 399 | return sysfs_create_link_nowarn(&mem_blk->dev.kobj, |
| 400 | &node_devices[nid].dev.kobj, |
| 401 | kobject_name(&node_devices[nid].dev.kobj)); |
| 402 | } |
| 403 | /* mem section does not span the specified node */ |
| 404 | return 0; |
| 405 | } |
| 406 | |
| 407 | /* unregister memory section under all nodes that it spans */ |
| 408 | int unregister_mem_sect_under_nodes(struct memory_block *mem_blk, |
| 409 | unsigned long phys_index) |
| 410 | { |
| 411 | NODEMASK_ALLOC(nodemask_t, unlinked_nodes, GFP_KERNEL); |
| 412 | unsigned long pfn, sect_start_pfn, sect_end_pfn; |
| 413 | |
| 414 | if (!mem_blk) { |
| 415 | NODEMASK_FREE(unlinked_nodes); |
| 416 | return -EFAULT; |
| 417 | } |
| 418 | if (!unlinked_nodes) |
| 419 | return -ENOMEM; |
| 420 | nodes_clear(*unlinked_nodes); |
| 421 | |
| 422 | sect_start_pfn = section_nr_to_pfn(phys_index); |
| 423 | sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1; |
| 424 | for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) { |
| 425 | int nid; |
| 426 | |
| 427 | nid = get_nid_for_pfn(pfn); |
| 428 | if (nid < 0) |
| 429 | continue; |
| 430 | if (!node_online(nid)) |
| 431 | continue; |
| 432 | if (node_test_and_set(nid, *unlinked_nodes)) |
| 433 | continue; |
| 434 | sysfs_remove_link(&node_devices[nid].dev.kobj, |
| 435 | kobject_name(&mem_blk->dev.kobj)); |
| 436 | sysfs_remove_link(&mem_blk->dev.kobj, |
| 437 | kobject_name(&node_devices[nid].dev.kobj)); |
| 438 | } |
| 439 | NODEMASK_FREE(unlinked_nodes); |
| 440 | return 0; |
| 441 | } |
| 442 | |
| 443 | static int link_mem_sections(int nid) |
| 444 | { |
| 445 | unsigned long start_pfn = NODE_DATA(nid)->node_start_pfn; |
| 446 | unsigned long end_pfn = start_pfn + NODE_DATA(nid)->node_spanned_pages; |
| 447 | unsigned long pfn; |
| 448 | struct memory_block *mem_blk = NULL; |
| 449 | int err = 0; |
| 450 | |
| 451 | for (pfn = start_pfn; pfn < end_pfn; pfn += PAGES_PER_SECTION) { |
| 452 | unsigned long section_nr = pfn_to_section_nr(pfn); |
| 453 | struct mem_section *mem_sect; |
| 454 | int ret; |
| 455 | |
| 456 | if (!present_section_nr(section_nr)) |
| 457 | continue; |
| 458 | mem_sect = __nr_to_section(section_nr); |
| 459 | |
| 460 | /* same memblock ? */ |
| 461 | if (mem_blk) |
| 462 | if ((section_nr >= mem_blk->start_section_nr) && |
| 463 | (section_nr <= mem_blk->end_section_nr)) |
| 464 | continue; |
| 465 | |
| 466 | mem_blk = find_memory_block_hinted(mem_sect, mem_blk); |
| 467 | |
| 468 | ret = register_mem_sect_under_node(mem_blk, nid); |
| 469 | if (!err) |
| 470 | err = ret; |
| 471 | |
| 472 | /* discard ref obtained in find_memory_block() */ |
| 473 | } |
| 474 | |
| 475 | if (mem_blk) |
| 476 | kobject_put(&mem_blk->dev.kobj); |
| 477 | return err; |
| 478 | } |
| 479 | |
| 480 | #ifdef CONFIG_HUGETLBFS |
| 481 | /* |
| 482 | * Handle per node hstate attribute [un]registration on transistions |
| 483 | * to/from memoryless state. |
| 484 | */ |
| 485 | static void node_hugetlb_work(struct work_struct *work) |
| 486 | { |
| 487 | struct node *node = container_of(work, struct node, node_work); |
| 488 | |
| 489 | /* |
| 490 | * We only get here when a node transitions to/from memoryless state. |
| 491 | * We can detect which transition occurred by examining whether the |
| 492 | * node has memory now. hugetlb_register_node() already check this |
| 493 | * so we try to register the attributes. If that fails, then the |
| 494 | * node has transitioned to memoryless, try to unregister the |
| 495 | * attributes. |
| 496 | */ |
| 497 | if (!hugetlb_register_node(node)) |
| 498 | hugetlb_unregister_node(node); |
| 499 | } |
| 500 | |
| 501 | static void init_node_hugetlb_work(int nid) |
| 502 | { |
| 503 | INIT_WORK(&node_devices[nid].node_work, node_hugetlb_work); |
| 504 | } |
| 505 | |
| 506 | static int node_memory_callback(struct notifier_block *self, |
| 507 | unsigned long action, void *arg) |
| 508 | { |
| 509 | struct memory_notify *mnb = arg; |
| 510 | int nid = mnb->status_change_nid; |
| 511 | |
| 512 | switch (action) { |
| 513 | case MEM_ONLINE: |
| 514 | case MEM_OFFLINE: |
| 515 | /* |
| 516 | * offload per node hstate [un]registration to a work thread |
| 517 | * when transitioning to/from memoryless state. |
| 518 | */ |
| 519 | if (nid != NUMA_NO_NODE) |
| 520 | schedule_work(&node_devices[nid].node_work); |
| 521 | break; |
| 522 | |
| 523 | case MEM_GOING_ONLINE: |
| 524 | case MEM_GOING_OFFLINE: |
| 525 | case MEM_CANCEL_ONLINE: |
| 526 | case MEM_CANCEL_OFFLINE: |
| 527 | default: |
| 528 | break; |
| 529 | } |
| 530 | |
| 531 | return NOTIFY_OK; |
| 532 | } |
| 533 | #endif /* CONFIG_HUGETLBFS */ |
| 534 | #else /* !CONFIG_MEMORY_HOTPLUG_SPARSE */ |
| 535 | |
| 536 | static int link_mem_sections(int nid) { return 0; } |
| 537 | #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */ |
| 538 | |
| 539 | #if !defined(CONFIG_MEMORY_HOTPLUG_SPARSE) || \ |
| 540 | !defined(CONFIG_HUGETLBFS) |
| 541 | static inline int node_memory_callback(struct notifier_block *self, |
| 542 | unsigned long action, void *arg) |
| 543 | { |
| 544 | return NOTIFY_OK; |
| 545 | } |
| 546 | |
| 547 | static void init_node_hugetlb_work(int nid) { } |
| 548 | |
| 549 | #endif |
| 550 | |
| 551 | int register_one_node(int nid) |
| 552 | { |
| 553 | int error = 0; |
| 554 | int cpu; |
| 555 | |
| 556 | if (node_online(nid)) { |
| 557 | int p_node = parent_node(nid); |
| 558 | struct node *parent = NULL; |
| 559 | |
| 560 | if (p_node != nid) |
| 561 | parent = &node_devices[p_node]; |
| 562 | |
| 563 | error = register_node(&node_devices[nid], nid, parent); |
| 564 | |
| 565 | /* link cpu under this node */ |
| 566 | for_each_present_cpu(cpu) { |
| 567 | if (cpu_to_node(cpu) == nid) |
| 568 | register_cpu_under_node(cpu, nid); |
| 569 | } |
| 570 | |
| 571 | /* link memory sections under this node */ |
| 572 | error = link_mem_sections(nid); |
| 573 | |
| 574 | /* initialize work queue for memory hot plug */ |
| 575 | init_node_hugetlb_work(nid); |
| 576 | } |
| 577 | |
| 578 | return error; |
| 579 | |
| 580 | } |
| 581 | |
| 582 | void unregister_one_node(int nid) |
| 583 | { |
| 584 | unregister_node(&node_devices[nid]); |
| 585 | } |
| 586 | |
| 587 | /* |
| 588 | * node states attributes |
| 589 | */ |
| 590 | |
| 591 | static ssize_t print_nodes_state(enum node_states state, char *buf) |
| 592 | { |
| 593 | int n; |
| 594 | |
| 595 | n = nodelist_scnprintf(buf, PAGE_SIZE-2, node_states[state]); |
| 596 | buf[n++] = '\n'; |
| 597 | buf[n] = '\0'; |
| 598 | return n; |
| 599 | } |
| 600 | |
| 601 | struct node_attr { |
| 602 | struct device_attribute attr; |
| 603 | enum node_states state; |
| 604 | }; |
| 605 | |
| 606 | static ssize_t show_node_state(struct device *dev, |
| 607 | struct device_attribute *attr, char *buf) |
| 608 | { |
| 609 | struct node_attr *na = container_of(attr, struct node_attr, attr); |
| 610 | return print_nodes_state(na->state, buf); |
| 611 | } |
| 612 | |
| 613 | #define _NODE_ATTR(name, state) \ |
| 614 | { __ATTR(name, 0444, show_node_state, NULL), state } |
| 615 | |
| 616 | static struct node_attr node_state_attr[] = { |
| 617 | _NODE_ATTR(possible, N_POSSIBLE), |
| 618 | _NODE_ATTR(online, N_ONLINE), |
| 619 | _NODE_ATTR(has_normal_memory, N_NORMAL_MEMORY), |
| 620 | _NODE_ATTR(has_cpu, N_CPU), |
| 621 | #ifdef CONFIG_HIGHMEM |
| 622 | _NODE_ATTR(has_high_memory, N_HIGH_MEMORY), |
| 623 | #endif |
| 624 | }; |
| 625 | |
| 626 | static struct attribute *node_state_attrs[] = { |
| 627 | &node_state_attr[0].attr.attr, |
| 628 | &node_state_attr[1].attr.attr, |
| 629 | &node_state_attr[2].attr.attr, |
| 630 | &node_state_attr[3].attr.attr, |
| 631 | #ifdef CONFIG_HIGHMEM |
| 632 | &node_state_attr[4].attr.attr, |
| 633 | #endif |
| 634 | NULL |
| 635 | }; |
| 636 | |
| 637 | static struct attribute_group memory_root_attr_group = { |
| 638 | .attrs = node_state_attrs, |
| 639 | }; |
| 640 | |
| 641 | static const struct attribute_group *cpu_root_attr_groups[] = { |
| 642 | &memory_root_attr_group, |
| 643 | NULL, |
| 644 | }; |
| 645 | |
| 646 | #define NODE_CALLBACK_PRI 2 /* lower than SLAB */ |
| 647 | static int __init register_node_type(void) |
| 648 | { |
| 649 | int ret; |
| 650 | |
| 651 | BUILD_BUG_ON(ARRAY_SIZE(node_state_attr) != NR_NODE_STATES); |
| 652 | BUILD_BUG_ON(ARRAY_SIZE(node_state_attrs)-1 != NR_NODE_STATES); |
| 653 | |
| 654 | ret = subsys_system_register(&node_subsys, cpu_root_attr_groups); |
| 655 | if (!ret) { |
| 656 | hotplug_memory_notifier(node_memory_callback, |
| 657 | NODE_CALLBACK_PRI); |
| 658 | } |
| 659 | |
| 660 | /* |
| 661 | * Note: we're not going to unregister the node class if we fail |
| 662 | * to register the node state class attribute files. |
| 663 | */ |
| 664 | return ret; |
| 665 | } |
| 666 | postcore_initcall(register_node_type); |