1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Basic Node interface support 4 */ 5 6 #include <linux/module.h> 7 #include <linux/init.h> 8 #include <linux/mm.h> 9 #include <linux/memory.h> 10 #include <linux/mempolicy.h> 11 #include <linux/vmstat.h> 12 #include <linux/notifier.h> 13 #include <linux/node.h> 14 #include <linux/hugetlb.h> 15 #include <linux/compaction.h> 16 #include <linux/cpumask.h> 17 #include <linux/topology.h> 18 #include <linux/nodemask.h> 19 #include <linux/cpu.h> 20 #include <linux/device.h> 21 #include <linux/pm_runtime.h> 22 #include <linux/swap.h> 23 #include <linux/slab.h> 24 #include <linux/memblock.h> 25 26 static const struct bus_type node_subsys = { 27 .name = "node", 28 .dev_name = "node", 29 }; 30 31 static inline ssize_t cpumap_read(struct file *file, struct kobject *kobj, 32 const struct bin_attribute *attr, char *buf, 33 loff_t off, size_t count) 34 { 35 struct device *dev = kobj_to_dev(kobj); 36 struct node *node_dev = to_node(dev); 37 cpumask_var_t mask; 38 ssize_t n; 39 40 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 41 return 0; 42 43 cpumask_and(mask, cpumask_of_node(node_dev->dev.id), cpu_online_mask); 44 n = cpumap_print_bitmask_to_buf(buf, mask, off, count); 45 free_cpumask_var(mask); 46 47 return n; 48 } 49 50 static const BIN_ATTR_RO(cpumap, CPUMAP_FILE_MAX_BYTES); 51 52 static inline ssize_t cpulist_read(struct file *file, struct kobject *kobj, 53 const struct bin_attribute *attr, char *buf, 54 loff_t off, size_t count) 55 { 56 struct device *dev = kobj_to_dev(kobj); 57 struct node *node_dev = to_node(dev); 58 cpumask_var_t mask; 59 ssize_t n; 60 61 if (!alloc_cpumask_var(&mask, GFP_KERNEL)) 62 return 0; 63 64 cpumask_and(mask, cpumask_of_node(node_dev->dev.id), cpu_online_mask); 65 n = cpumap_print_list_to_buf(buf, mask, off, count); 66 free_cpumask_var(mask); 67 68 return n; 69 } 70 71 static const BIN_ATTR_RO(cpulist, CPULIST_FILE_MAX_BYTES); 72 73 /** 74 * struct node_access_nodes - Access class device to hold user visible 75 * relationships to other nodes. 76 * @dev: Device for this memory access class 77 * @list_node: List element in the node's access list 78 * @access: The access class rank 79 * @coord: Heterogeneous memory performance coordinates 80 */ 81 struct node_access_nodes { 82 struct device dev; 83 struct list_head list_node; 84 unsigned int access; 85 #ifdef CONFIG_HMEM_REPORTING 86 struct access_coordinate coord; 87 #endif 88 }; 89 #define to_access_nodes(dev) container_of(dev, struct node_access_nodes, dev) 90 91 static struct attribute *node_init_access_node_attrs[] = { 92 NULL, 93 }; 94 95 static struct attribute *node_targ_access_node_attrs[] = { 96 NULL, 97 }; 98 99 static const struct attribute_group initiators = { 100 .name = "initiators", 101 .attrs = node_init_access_node_attrs, 102 }; 103 104 static const struct attribute_group targets = { 105 .name = "targets", 106 .attrs = node_targ_access_node_attrs, 107 }; 108 109 static const struct attribute_group *node_access_node_groups[] = { 110 &initiators, 111 &targets, 112 NULL, 113 }; 114 115 #ifdef CONFIG_MEMORY_HOTPLUG 116 static BLOCKING_NOTIFIER_HEAD(node_chain); 117 118 int register_node_notifier(struct notifier_block *nb) 119 { 120 return blocking_notifier_chain_register(&node_chain, nb); 121 } 122 EXPORT_SYMBOL(register_node_notifier); 123 124 void unregister_node_notifier(struct notifier_block *nb) 125 { 126 blocking_notifier_chain_unregister(&node_chain, nb); 127 } 128 EXPORT_SYMBOL(unregister_node_notifier); 129 130 int node_notify(unsigned long val, void *v) 131 { 132 return blocking_notifier_call_chain(&node_chain, val, v); 133 } 134 #endif 135 136 static void node_remove_accesses(struct node *node) 137 { 138 struct node_access_nodes *c, *cnext; 139 140 list_for_each_entry_safe(c, cnext, &node->access_list, list_node) { 141 list_del(&c->list_node); 142 device_unregister(&c->dev); 143 } 144 } 145 146 static void node_access_release(struct device *dev) 147 { 148 kfree(to_access_nodes(dev)); 149 } 150 151 static struct node_access_nodes *node_init_node_access(struct node *node, 152 enum access_coordinate_class access) 153 { 154 struct node_access_nodes *access_node; 155 struct device *dev; 156 157 list_for_each_entry(access_node, &node->access_list, list_node) 158 if (access_node->access == access) 159 return access_node; 160 161 access_node = kzalloc(sizeof(*access_node), GFP_KERNEL); 162 if (!access_node) 163 return NULL; 164 165 access_node->access = access; 166 dev = &access_node->dev; 167 dev->parent = &node->dev; 168 dev->release = node_access_release; 169 dev->groups = node_access_node_groups; 170 if (dev_set_name(dev, "access%u", access)) 171 goto free; 172 173 if (device_register(dev)) 174 goto free_name; 175 176 pm_runtime_no_callbacks(dev); 177 list_add_tail(&access_node->list_node, &node->access_list); 178 return access_node; 179 free_name: 180 kfree_const(dev->kobj.name); 181 free: 182 kfree(access_node); 183 return NULL; 184 } 185 186 #ifdef CONFIG_HMEM_REPORTING 187 #define ACCESS_ATTR(property) \ 188 static ssize_t property##_show(struct device *dev, \ 189 struct device_attribute *attr, \ 190 char *buf) \ 191 { \ 192 return sysfs_emit(buf, "%u\n", \ 193 to_access_nodes(dev)->coord.property); \ 194 } \ 195 static DEVICE_ATTR_RO(property) 196 197 ACCESS_ATTR(read_bandwidth); 198 ACCESS_ATTR(read_latency); 199 ACCESS_ATTR(write_bandwidth); 200 ACCESS_ATTR(write_latency); 201 202 static struct attribute *access_attrs[] = { 203 &dev_attr_read_bandwidth.attr, 204 &dev_attr_read_latency.attr, 205 &dev_attr_write_bandwidth.attr, 206 &dev_attr_write_latency.attr, 207 NULL, 208 }; 209 210 /** 211 * node_set_perf_attrs - Set the performance values for given access class 212 * @nid: Node identifier to be set 213 * @coord: Heterogeneous memory performance coordinates 214 * @access: The access class the for the given attributes 215 */ 216 void node_set_perf_attrs(unsigned int nid, struct access_coordinate *coord, 217 enum access_coordinate_class access) 218 { 219 struct node_access_nodes *c; 220 struct node *node; 221 int i; 222 223 if (WARN_ON_ONCE(!node_online(nid))) 224 return; 225 226 node = node_devices[nid]; 227 c = node_init_node_access(node, access); 228 if (!c) 229 return; 230 231 c->coord = *coord; 232 for (i = 0; access_attrs[i] != NULL; i++) { 233 if (sysfs_add_file_to_group(&c->dev.kobj, access_attrs[i], 234 "initiators")) { 235 pr_info("failed to add performance attribute to node %d\n", 236 nid); 237 break; 238 } 239 } 240 241 /* When setting CPU access coordinates, update mempolicy */ 242 if (access == ACCESS_COORDINATE_CPU) { 243 if (mempolicy_set_node_perf(nid, coord)) { 244 pr_info("failed to set mempolicy attrs for node %d\n", 245 nid); 246 } 247 } 248 } 249 EXPORT_SYMBOL_GPL(node_set_perf_attrs); 250 251 /** 252 * struct node_cache_info - Internal tracking for memory node caches 253 * @dev: Device represeting the cache level 254 * @node: List element for tracking in the node 255 * @cache_attrs:Attributes for this cache level 256 */ 257 struct node_cache_info { 258 struct device dev; 259 struct list_head node; 260 struct node_cache_attrs cache_attrs; 261 }; 262 #define to_cache_info(device) container_of(device, struct node_cache_info, dev) 263 264 #define CACHE_ATTR(name, fmt) \ 265 static ssize_t name##_show(struct device *dev, \ 266 struct device_attribute *attr, \ 267 char *buf) \ 268 { \ 269 return sysfs_emit(buf, fmt "\n", \ 270 to_cache_info(dev)->cache_attrs.name); \ 271 } \ 272 static DEVICE_ATTR_RO(name); 273 274 CACHE_ATTR(size, "%llu") 275 CACHE_ATTR(line_size, "%u") 276 CACHE_ATTR(indexing, "%u") 277 CACHE_ATTR(write_policy, "%u") 278 CACHE_ATTR(address_mode, "%#x") 279 280 static struct attribute *cache_attrs[] = { 281 &dev_attr_indexing.attr, 282 &dev_attr_size.attr, 283 &dev_attr_line_size.attr, 284 &dev_attr_write_policy.attr, 285 &dev_attr_address_mode.attr, 286 NULL, 287 }; 288 ATTRIBUTE_GROUPS(cache); 289 290 static void node_cache_release(struct device *dev) 291 { 292 kfree(dev); 293 } 294 295 static void node_cacheinfo_release(struct device *dev) 296 { 297 struct node_cache_info *info = to_cache_info(dev); 298 kfree(info); 299 } 300 301 static void node_init_cache_dev(struct node *node) 302 { 303 struct device *dev; 304 305 dev = kzalloc(sizeof(*dev), GFP_KERNEL); 306 if (!dev) 307 return; 308 309 device_initialize(dev); 310 dev->parent = &node->dev; 311 dev->release = node_cache_release; 312 if (dev_set_name(dev, "memory_side_cache")) 313 goto put_device; 314 315 if (device_add(dev)) 316 goto put_device; 317 318 pm_runtime_no_callbacks(dev); 319 node->cache_dev = dev; 320 return; 321 put_device: 322 put_device(dev); 323 } 324 325 /** 326 * node_add_cache() - add cache attribute to a memory node 327 * @nid: Node identifier that has new cache attributes 328 * @cache_attrs: Attributes for the cache being added 329 */ 330 void node_add_cache(unsigned int nid, struct node_cache_attrs *cache_attrs) 331 { 332 struct node_cache_info *info; 333 struct device *dev; 334 struct node *node; 335 336 if (!node_online(nid) || !node_devices[nid]) 337 return; 338 339 node = node_devices[nid]; 340 list_for_each_entry(info, &node->cache_attrs, node) { 341 if (info->cache_attrs.level == cache_attrs->level) { 342 dev_warn(&node->dev, 343 "attempt to add duplicate cache level:%d\n", 344 cache_attrs->level); 345 return; 346 } 347 } 348 349 if (!node->cache_dev) 350 node_init_cache_dev(node); 351 if (!node->cache_dev) 352 return; 353 354 info = kzalloc(sizeof(*info), GFP_KERNEL); 355 if (!info) 356 return; 357 358 dev = &info->dev; 359 device_initialize(dev); 360 dev->parent = node->cache_dev; 361 dev->release = node_cacheinfo_release; 362 dev->groups = cache_groups; 363 if (dev_set_name(dev, "index%d", cache_attrs->level)) 364 goto put_device; 365 366 info->cache_attrs = *cache_attrs; 367 if (device_add(dev)) { 368 dev_warn(&node->dev, "failed to add cache level:%d\n", 369 cache_attrs->level); 370 goto put_device; 371 } 372 pm_runtime_no_callbacks(dev); 373 list_add_tail(&info->node, &node->cache_attrs); 374 return; 375 put_device: 376 put_device(dev); 377 } 378 379 static void node_remove_caches(struct node *node) 380 { 381 struct node_cache_info *info, *next; 382 383 if (!node->cache_dev) 384 return; 385 386 list_for_each_entry_safe(info, next, &node->cache_attrs, node) { 387 list_del(&info->node); 388 device_unregister(&info->dev); 389 } 390 device_unregister(node->cache_dev); 391 } 392 393 static void node_init_caches(unsigned int nid) 394 { 395 INIT_LIST_HEAD(&node_devices[nid]->cache_attrs); 396 } 397 #else 398 static void node_init_caches(unsigned int nid) { } 399 static void node_remove_caches(struct node *node) { } 400 #endif 401 402 #define K(x) ((x) << (PAGE_SHIFT - 10)) 403 static ssize_t node_read_meminfo(struct device *dev, 404 struct device_attribute *attr, char *buf) 405 { 406 int len = 0; 407 int nid = dev->id; 408 struct pglist_data *pgdat = NODE_DATA(nid); 409 struct sysinfo i; 410 unsigned long sreclaimable, sunreclaimable; 411 unsigned long swapcached = 0; 412 413 si_meminfo_node(&i, nid); 414 sreclaimable = node_page_state_pages(pgdat, NR_SLAB_RECLAIMABLE_B); 415 sunreclaimable = node_page_state_pages(pgdat, NR_SLAB_UNRECLAIMABLE_B); 416 #ifdef CONFIG_SWAP 417 swapcached = node_page_state_pages(pgdat, NR_SWAPCACHE); 418 #endif 419 len = sysfs_emit_at(buf, len, 420 "Node %d MemTotal: %8lu kB\n" 421 "Node %d MemFree: %8lu kB\n" 422 "Node %d MemUsed: %8lu kB\n" 423 "Node %d SwapCached: %8lu kB\n" 424 "Node %d Active: %8lu kB\n" 425 "Node %d Inactive: %8lu kB\n" 426 "Node %d Active(anon): %8lu kB\n" 427 "Node %d Inactive(anon): %8lu kB\n" 428 "Node %d Active(file): %8lu kB\n" 429 "Node %d Inactive(file): %8lu kB\n" 430 "Node %d Unevictable: %8lu kB\n" 431 "Node %d Mlocked: %8lu kB\n", 432 nid, K(i.totalram), 433 nid, K(i.freeram), 434 nid, K(i.totalram - i.freeram), 435 nid, K(swapcached), 436 nid, K(node_page_state(pgdat, NR_ACTIVE_ANON) + 437 node_page_state(pgdat, NR_ACTIVE_FILE)), 438 nid, K(node_page_state(pgdat, NR_INACTIVE_ANON) + 439 node_page_state(pgdat, NR_INACTIVE_FILE)), 440 nid, K(node_page_state(pgdat, NR_ACTIVE_ANON)), 441 nid, K(node_page_state(pgdat, NR_INACTIVE_ANON)), 442 nid, K(node_page_state(pgdat, NR_ACTIVE_FILE)), 443 nid, K(node_page_state(pgdat, NR_INACTIVE_FILE)), 444 nid, K(node_page_state(pgdat, NR_UNEVICTABLE)), 445 nid, K(sum_zone_node_page_state(nid, NR_MLOCK))); 446 447 #ifdef CONFIG_HIGHMEM 448 len += sysfs_emit_at(buf, len, 449 "Node %d HighTotal: %8lu kB\n" 450 "Node %d HighFree: %8lu kB\n" 451 "Node %d LowTotal: %8lu kB\n" 452 "Node %d LowFree: %8lu kB\n", 453 nid, K(i.totalhigh), 454 nid, K(i.freehigh), 455 nid, K(i.totalram - i.totalhigh), 456 nid, K(i.freeram - i.freehigh)); 457 #endif 458 len += sysfs_emit_at(buf, len, 459 "Node %d Dirty: %8lu kB\n" 460 "Node %d Writeback: %8lu kB\n" 461 "Node %d FilePages: %8lu kB\n" 462 "Node %d Mapped: %8lu kB\n" 463 "Node %d AnonPages: %8lu kB\n" 464 "Node %d Shmem: %8lu kB\n" 465 "Node %d KernelStack: %8lu kB\n" 466 #ifdef CONFIG_SHADOW_CALL_STACK 467 "Node %d ShadowCallStack:%8lu kB\n" 468 #endif 469 "Node %d PageTables: %8lu kB\n" 470 "Node %d SecPageTables: %8lu kB\n" 471 "Node %d NFS_Unstable: %8lu kB\n" 472 "Node %d Bounce: %8lu kB\n" 473 "Node %d WritebackTmp: %8lu kB\n" 474 "Node %d KReclaimable: %8lu kB\n" 475 "Node %d Slab: %8lu kB\n" 476 "Node %d SReclaimable: %8lu kB\n" 477 "Node %d SUnreclaim: %8lu kB\n" 478 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 479 "Node %d AnonHugePages: %8lu kB\n" 480 "Node %d ShmemHugePages: %8lu kB\n" 481 "Node %d ShmemPmdMapped: %8lu kB\n" 482 "Node %d FileHugePages: %8lu kB\n" 483 "Node %d FilePmdMapped: %8lu kB\n" 484 #endif 485 #ifdef CONFIG_UNACCEPTED_MEMORY 486 "Node %d Unaccepted: %8lu kB\n" 487 #endif 488 , 489 nid, K(node_page_state(pgdat, NR_FILE_DIRTY)), 490 nid, K(node_page_state(pgdat, NR_WRITEBACK)), 491 nid, K(node_page_state(pgdat, NR_FILE_PAGES)), 492 nid, K(node_page_state(pgdat, NR_FILE_MAPPED)), 493 nid, K(node_page_state(pgdat, NR_ANON_MAPPED)), 494 nid, K(i.sharedram), 495 nid, node_page_state(pgdat, NR_KERNEL_STACK_KB), 496 #ifdef CONFIG_SHADOW_CALL_STACK 497 nid, node_page_state(pgdat, NR_KERNEL_SCS_KB), 498 #endif 499 nid, K(node_page_state(pgdat, NR_PAGETABLE)), 500 nid, K(node_page_state(pgdat, NR_SECONDARY_PAGETABLE)), 501 nid, 0UL, 502 nid, 0UL, 503 nid, K(node_page_state(pgdat, NR_WRITEBACK_TEMP)), 504 nid, K(sreclaimable + 505 node_page_state(pgdat, NR_KERNEL_MISC_RECLAIMABLE)), 506 nid, K(sreclaimable + sunreclaimable), 507 nid, K(sreclaimable), 508 nid, K(sunreclaimable) 509 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 510 , 511 nid, K(node_page_state(pgdat, NR_ANON_THPS)), 512 nid, K(node_page_state(pgdat, NR_SHMEM_THPS)), 513 nid, K(node_page_state(pgdat, NR_SHMEM_PMDMAPPED)), 514 nid, K(node_page_state(pgdat, NR_FILE_THPS)), 515 nid, K(node_page_state(pgdat, NR_FILE_PMDMAPPED)) 516 #endif 517 #ifdef CONFIG_UNACCEPTED_MEMORY 518 , 519 nid, K(sum_zone_node_page_state(nid, NR_UNACCEPTED)) 520 #endif 521 ); 522 len += hugetlb_report_node_meminfo(buf, len, nid); 523 return len; 524 } 525 526 #undef K 527 static DEVICE_ATTR(meminfo, 0444, node_read_meminfo, NULL); 528 529 static ssize_t node_read_numastat(struct device *dev, 530 struct device_attribute *attr, char *buf) 531 { 532 fold_vm_numa_events(); 533 return sysfs_emit(buf, 534 "numa_hit %lu\n" 535 "numa_miss %lu\n" 536 "numa_foreign %lu\n" 537 "interleave_hit %lu\n" 538 "local_node %lu\n" 539 "other_node %lu\n", 540 sum_zone_numa_event_state(dev->id, NUMA_HIT), 541 sum_zone_numa_event_state(dev->id, NUMA_MISS), 542 sum_zone_numa_event_state(dev->id, NUMA_FOREIGN), 543 sum_zone_numa_event_state(dev->id, NUMA_INTERLEAVE_HIT), 544 sum_zone_numa_event_state(dev->id, NUMA_LOCAL), 545 sum_zone_numa_event_state(dev->id, NUMA_OTHER)); 546 } 547 static DEVICE_ATTR(numastat, 0444, node_read_numastat, NULL); 548 549 static ssize_t node_read_vmstat(struct device *dev, 550 struct device_attribute *attr, char *buf) 551 { 552 int nid = dev->id; 553 struct pglist_data *pgdat = NODE_DATA(nid); 554 int i; 555 int len = 0; 556 557 for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) 558 len += sysfs_emit_at(buf, len, "%s %lu\n", 559 zone_stat_name(i), 560 sum_zone_node_page_state(nid, i)); 561 562 #ifdef CONFIG_NUMA 563 fold_vm_numa_events(); 564 for (i = 0; i < NR_VM_NUMA_EVENT_ITEMS; i++) 565 len += sysfs_emit_at(buf, len, "%s %lu\n", 566 numa_stat_name(i), 567 sum_zone_numa_event_state(nid, i)); 568 569 #endif 570 for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++) { 571 unsigned long pages = node_page_state_pages(pgdat, i); 572 573 if (vmstat_item_print_in_thp(i)) 574 pages /= HPAGE_PMD_NR; 575 len += sysfs_emit_at(buf, len, "%s %lu\n", node_stat_name(i), 576 pages); 577 } 578 579 return len; 580 } 581 static DEVICE_ATTR(vmstat, 0444, node_read_vmstat, NULL); 582 583 static ssize_t node_read_distance(struct device *dev, 584 struct device_attribute *attr, char *buf) 585 { 586 int nid = dev->id; 587 int len = 0; 588 int i; 589 590 /* 591 * buf is currently PAGE_SIZE in length and each node needs 4 chars 592 * at the most (distance + space or newline). 593 */ 594 BUILD_BUG_ON(MAX_NUMNODES * 4 > PAGE_SIZE); 595 596 for_each_online_node(i) { 597 len += sysfs_emit_at(buf, len, "%s%d", 598 i ? " " : "", node_distance(nid, i)); 599 } 600 601 len += sysfs_emit_at(buf, len, "\n"); 602 return len; 603 } 604 static DEVICE_ATTR(distance, 0444, node_read_distance, NULL); 605 606 static struct attribute *node_dev_attrs[] = { 607 &dev_attr_meminfo.attr, 608 &dev_attr_numastat.attr, 609 &dev_attr_distance.attr, 610 &dev_attr_vmstat.attr, 611 NULL 612 }; 613 614 static const struct bin_attribute *node_dev_bin_attrs[] = { 615 &bin_attr_cpumap, 616 &bin_attr_cpulist, 617 NULL 618 }; 619 620 static const struct attribute_group node_dev_group = { 621 .attrs = node_dev_attrs, 622 .bin_attrs_new = node_dev_bin_attrs, 623 }; 624 625 static const struct attribute_group *node_dev_groups[] = { 626 &node_dev_group, 627 #ifdef CONFIG_HAVE_ARCH_NODE_DEV_GROUP 628 &arch_node_dev_group, 629 #endif 630 #ifdef CONFIG_MEMORY_FAILURE 631 &memory_failure_attr_group, 632 #endif 633 NULL 634 }; 635 636 static void node_device_release(struct device *dev) 637 { 638 kfree(to_node(dev)); 639 } 640 641 /* 642 * register_node - Setup a sysfs device for a node. 643 * @num - Node number to use when creating the device. 644 * 645 * Initialize and register the node device. 646 */ 647 static int register_node(struct node *node, int num) 648 { 649 int error; 650 651 node->dev.id = num; 652 node->dev.bus = &node_subsys; 653 node->dev.release = node_device_release; 654 node->dev.groups = node_dev_groups; 655 error = device_register(&node->dev); 656 657 if (error) { 658 put_device(&node->dev); 659 } else { 660 hugetlb_register_node(node); 661 compaction_register_node(node); 662 } 663 664 return error; 665 } 666 667 /** 668 * unregister_node - unregister a node device 669 * @node: node going away 670 * 671 * Unregisters a node device @node. All the devices on the node must be 672 * unregistered before calling this function. 673 */ 674 void unregister_node(struct node *node) 675 { 676 hugetlb_unregister_node(node); 677 compaction_unregister_node(node); 678 node_remove_accesses(node); 679 node_remove_caches(node); 680 device_unregister(&node->dev); 681 } 682 683 struct node *node_devices[MAX_NUMNODES]; 684 685 /* 686 * register cpu under node 687 */ 688 int register_cpu_under_node(unsigned int cpu, unsigned int nid) 689 { 690 int ret; 691 struct device *obj; 692 693 if (!node_online(nid)) 694 return 0; 695 696 obj = get_cpu_device(cpu); 697 if (!obj) 698 return 0; 699 700 ret = sysfs_create_link(&node_devices[nid]->dev.kobj, 701 &obj->kobj, 702 kobject_name(&obj->kobj)); 703 if (ret) 704 return ret; 705 706 return sysfs_create_link(&obj->kobj, 707 &node_devices[nid]->dev.kobj, 708 kobject_name(&node_devices[nid]->dev.kobj)); 709 } 710 711 /** 712 * register_memory_node_under_compute_node - link memory node to its compute 713 * node for a given access class. 714 * @mem_nid: Memory node number 715 * @cpu_nid: Cpu node number 716 * @access: Access class to register 717 * 718 * Description: 719 * For use with platforms that may have separate memory and compute nodes. 720 * This function will export node relationships linking which memory 721 * initiator nodes can access memory targets at a given ranked access 722 * class. 723 */ 724 int register_memory_node_under_compute_node(unsigned int mem_nid, 725 unsigned int cpu_nid, 726 enum access_coordinate_class access) 727 { 728 struct node *init_node, *targ_node; 729 struct node_access_nodes *initiator, *target; 730 int ret; 731 732 if (!node_online(cpu_nid) || !node_online(mem_nid)) 733 return -ENODEV; 734 735 init_node = node_devices[cpu_nid]; 736 targ_node = node_devices[mem_nid]; 737 initiator = node_init_node_access(init_node, access); 738 target = node_init_node_access(targ_node, access); 739 if (!initiator || !target) 740 return -ENOMEM; 741 742 ret = sysfs_add_link_to_group(&initiator->dev.kobj, "targets", 743 &targ_node->dev.kobj, 744 dev_name(&targ_node->dev)); 745 if (ret) 746 return ret; 747 748 ret = sysfs_add_link_to_group(&target->dev.kobj, "initiators", 749 &init_node->dev.kobj, 750 dev_name(&init_node->dev)); 751 if (ret) 752 goto err; 753 754 return 0; 755 err: 756 sysfs_remove_link_from_group(&initiator->dev.kobj, "targets", 757 dev_name(&targ_node->dev)); 758 return ret; 759 } 760 761 int unregister_cpu_under_node(unsigned int cpu, unsigned int nid) 762 { 763 struct device *obj; 764 765 if (!node_online(nid)) 766 return 0; 767 768 obj = get_cpu_device(cpu); 769 if (!obj) 770 return 0; 771 772 sysfs_remove_link(&node_devices[nid]->dev.kobj, 773 kobject_name(&obj->kobj)); 774 sysfs_remove_link(&obj->kobj, 775 kobject_name(&node_devices[nid]->dev.kobj)); 776 777 return 0; 778 } 779 780 #ifdef CONFIG_MEMORY_HOTPLUG 781 static void do_register_memory_block_under_node(int nid, 782 struct memory_block *mem_blk, 783 enum meminit_context context) 784 { 785 int ret; 786 787 memory_block_add_nid(mem_blk, nid, context); 788 789 ret = sysfs_create_link_nowarn(&node_devices[nid]->dev.kobj, 790 &mem_blk->dev.kobj, 791 kobject_name(&mem_blk->dev.kobj)); 792 if (ret && ret != -EEXIST) 793 dev_err_ratelimited(&node_devices[nid]->dev, 794 "can't create link to %s in sysfs (%d)\n", 795 kobject_name(&mem_blk->dev.kobj), ret); 796 797 ret = sysfs_create_link_nowarn(&mem_blk->dev.kobj, 798 &node_devices[nid]->dev.kobj, 799 kobject_name(&node_devices[nid]->dev.kobj)); 800 if (ret && ret != -EEXIST) 801 dev_err_ratelimited(&mem_blk->dev, 802 "can't create link to %s in sysfs (%d)\n", 803 kobject_name(&node_devices[nid]->dev.kobj), 804 ret); 805 } 806 807 /* 808 * During hotplug we know that all pages in the memory block belong to the same 809 * node. 810 */ 811 static int register_mem_block_under_node_hotplug(struct memory_block *mem_blk, 812 void *arg) 813 { 814 int nid = *(int *)arg; 815 816 do_register_memory_block_under_node(nid, mem_blk, MEMINIT_HOTPLUG); 817 return 0; 818 } 819 820 /* 821 * Unregister a memory block device under the node it spans. Memory blocks 822 * with multiple nodes cannot be offlined and therefore also never be removed. 823 */ 824 void unregister_memory_block_under_nodes(struct memory_block *mem_blk) 825 { 826 if (mem_blk->nid == NUMA_NO_NODE) 827 return; 828 829 sysfs_remove_link(&node_devices[mem_blk->nid]->dev.kobj, 830 kobject_name(&mem_blk->dev.kobj)); 831 sysfs_remove_link(&mem_blk->dev.kobj, 832 kobject_name(&node_devices[mem_blk->nid]->dev.kobj)); 833 } 834 835 /* register all memory blocks under the corresponding nodes */ 836 static void register_memory_blocks_under_nodes(void) 837 { 838 struct memblock_region *r; 839 840 for_each_mem_region(r) { 841 const unsigned long start_block_id = phys_to_block_id(r->base); 842 const unsigned long end_block_id = phys_to_block_id(r->base + r->size - 1); 843 const int nid = memblock_get_region_node(r); 844 unsigned long block_id; 845 846 if (!node_online(nid)) 847 continue; 848 849 for (block_id = start_block_id; block_id <= end_block_id; block_id++) { 850 struct memory_block *mem; 851 852 mem = find_memory_block_by_id(block_id); 853 if (!mem) 854 continue; 855 856 do_register_memory_block_under_node(nid, mem, MEMINIT_EARLY); 857 put_device(&mem->dev); 858 } 859 860 } 861 } 862 863 void register_memory_blocks_under_node_hotplug(int nid, unsigned long start_pfn, 864 unsigned long end_pfn) 865 { 866 walk_memory_blocks(PFN_PHYS(start_pfn), PFN_PHYS(end_pfn - start_pfn), 867 (void *)&nid, register_mem_block_under_node_hotplug); 868 return; 869 } 870 #endif /* CONFIG_MEMORY_HOTPLUG */ 871 872 int register_one_node(int nid) 873 { 874 int error; 875 int cpu; 876 struct node *node; 877 878 node = kzalloc(sizeof(struct node), GFP_KERNEL); 879 if (!node) 880 return -ENOMEM; 881 882 INIT_LIST_HEAD(&node->access_list); 883 node_devices[nid] = node; 884 885 error = register_node(node_devices[nid], nid); 886 887 /* link cpu under this node */ 888 for_each_present_cpu(cpu) { 889 if (cpu_to_node(cpu) == nid) 890 register_cpu_under_node(cpu, nid); 891 } 892 893 node_init_caches(nid); 894 895 return error; 896 } 897 898 void unregister_one_node(int nid) 899 { 900 if (!node_devices[nid]) 901 return; 902 903 unregister_node(node_devices[nid]); 904 node_devices[nid] = NULL; 905 } 906 907 /* 908 * node states attributes 909 */ 910 911 struct node_attr { 912 struct device_attribute attr; 913 enum node_states state; 914 }; 915 916 static ssize_t show_node_state(struct device *dev, 917 struct device_attribute *attr, char *buf) 918 { 919 struct node_attr *na = container_of(attr, struct node_attr, attr); 920 921 return sysfs_emit(buf, "%*pbl\n", 922 nodemask_pr_args(&node_states[na->state])); 923 } 924 925 #define _NODE_ATTR(name, state) \ 926 { __ATTR(name, 0444, show_node_state, NULL), state } 927 928 static struct node_attr node_state_attr[] = { 929 [N_POSSIBLE] = _NODE_ATTR(possible, N_POSSIBLE), 930 [N_ONLINE] = _NODE_ATTR(online, N_ONLINE), 931 [N_NORMAL_MEMORY] = _NODE_ATTR(has_normal_memory, N_NORMAL_MEMORY), 932 #ifdef CONFIG_HIGHMEM 933 [N_HIGH_MEMORY] = _NODE_ATTR(has_high_memory, N_HIGH_MEMORY), 934 #endif 935 [N_MEMORY] = _NODE_ATTR(has_memory, N_MEMORY), 936 [N_CPU] = _NODE_ATTR(has_cpu, N_CPU), 937 [N_GENERIC_INITIATOR] = _NODE_ATTR(has_generic_initiator, 938 N_GENERIC_INITIATOR), 939 }; 940 941 static struct attribute *node_state_attrs[] = { 942 &node_state_attr[N_POSSIBLE].attr.attr, 943 &node_state_attr[N_ONLINE].attr.attr, 944 &node_state_attr[N_NORMAL_MEMORY].attr.attr, 945 #ifdef CONFIG_HIGHMEM 946 &node_state_attr[N_HIGH_MEMORY].attr.attr, 947 #endif 948 &node_state_attr[N_MEMORY].attr.attr, 949 &node_state_attr[N_CPU].attr.attr, 950 &node_state_attr[N_GENERIC_INITIATOR].attr.attr, 951 NULL 952 }; 953 954 static const struct attribute_group memory_root_attr_group = { 955 .attrs = node_state_attrs, 956 }; 957 958 static const struct attribute_group *cpu_root_attr_groups[] = { 959 &memory_root_attr_group, 960 NULL, 961 }; 962 963 void __init node_dev_init(void) 964 { 965 int ret, i; 966 967 BUILD_BUG_ON(ARRAY_SIZE(node_state_attr) != NR_NODE_STATES); 968 BUILD_BUG_ON(ARRAY_SIZE(node_state_attrs)-1 != NR_NODE_STATES); 969 970 ret = subsys_system_register(&node_subsys, cpu_root_attr_groups); 971 if (ret) 972 panic("%s() failed to register subsystem: %d\n", __func__, ret); 973 974 /* 975 * Create all node devices, which will properly link the node 976 * to already created cpu devices. 977 */ 978 for_each_online_node(i) { 979 ret = register_one_node(i); 980 if (ret) 981 panic("%s() failed to add node: %d\n", __func__, ret); 982 } 983 984 register_memory_blocks_under_nodes(); 985 } 986