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