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 25 static const 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 const 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 const BIN_ATTR_RO(cpumap, CPUMAP_FILE_MAX_BYTES); 50 51 static inline ssize_t cpulist_read(struct file *file, struct kobject *kobj, 52 const 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 const 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 * @coord: Heterogeneous memory performance coordinates 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 access_coordinate coord; 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 enum access_coordinate_class 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)->coord.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 * @coord: Heterogeneous memory performance coordinates 192 * @access: The access class the for the given attributes 193 */ 194 void node_set_perf_attrs(unsigned int nid, struct access_coordinate *coord, 195 enum access_coordinate_class 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->coord = *coord; 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 /* When setting CPU access coordinates, update mempolicy */ 220 if (access == ACCESS_COORDINATE_CPU) { 221 if (mempolicy_set_node_perf(nid, coord)) { 222 pr_info("failed to set mempolicy attrs for node %d\n", 223 nid); 224 } 225 } 226 } 227 EXPORT_SYMBOL_GPL(node_set_perf_attrs); 228 229 /** 230 * struct node_cache_info - Internal tracking for memory node caches 231 * @dev: Device represeting the cache level 232 * @node: List element for tracking in the node 233 * @cache_attrs:Attributes for this cache level 234 */ 235 struct node_cache_info { 236 struct device dev; 237 struct list_head node; 238 struct node_cache_attrs cache_attrs; 239 }; 240 #define to_cache_info(device) container_of(device, struct node_cache_info, dev) 241 242 #define CACHE_ATTR(name, fmt) \ 243 static ssize_t name##_show(struct device *dev, \ 244 struct device_attribute *attr, \ 245 char *buf) \ 246 { \ 247 return sysfs_emit(buf, fmt "\n", \ 248 to_cache_info(dev)->cache_attrs.name); \ 249 } \ 250 static DEVICE_ATTR_RO(name); 251 252 CACHE_ATTR(size, "%llu") 253 CACHE_ATTR(line_size, "%u") 254 CACHE_ATTR(indexing, "%u") 255 CACHE_ATTR(write_policy, "%u") 256 CACHE_ATTR(address_mode, "%#x") 257 258 static struct attribute *cache_attrs[] = { 259 &dev_attr_indexing.attr, 260 &dev_attr_size.attr, 261 &dev_attr_line_size.attr, 262 &dev_attr_write_policy.attr, 263 &dev_attr_address_mode.attr, 264 NULL, 265 }; 266 ATTRIBUTE_GROUPS(cache); 267 268 static void node_cache_release(struct device *dev) 269 { 270 kfree(dev); 271 } 272 273 static void node_cacheinfo_release(struct device *dev) 274 { 275 struct node_cache_info *info = to_cache_info(dev); 276 kfree(info); 277 } 278 279 static void node_init_cache_dev(struct node *node) 280 { 281 struct device *dev; 282 283 dev = kzalloc(sizeof(*dev), GFP_KERNEL); 284 if (!dev) 285 return; 286 287 device_initialize(dev); 288 dev->parent = &node->dev; 289 dev->release = node_cache_release; 290 if (dev_set_name(dev, "memory_side_cache")) 291 goto put_device; 292 293 if (device_add(dev)) 294 goto put_device; 295 296 pm_runtime_no_callbacks(dev); 297 node->cache_dev = dev; 298 return; 299 put_device: 300 put_device(dev); 301 } 302 303 /** 304 * node_add_cache() - add cache attribute to a memory node 305 * @nid: Node identifier that has new cache attributes 306 * @cache_attrs: Attributes for the cache being added 307 */ 308 void node_add_cache(unsigned int nid, struct node_cache_attrs *cache_attrs) 309 { 310 struct node_cache_info *info; 311 struct device *dev; 312 struct node *node; 313 314 if (!node_online(nid) || !node_devices[nid]) 315 return; 316 317 node = node_devices[nid]; 318 list_for_each_entry(info, &node->cache_attrs, node) { 319 if (info->cache_attrs.level == cache_attrs->level) { 320 dev_warn(&node->dev, 321 "attempt to add duplicate cache level:%d\n", 322 cache_attrs->level); 323 return; 324 } 325 } 326 327 if (!node->cache_dev) 328 node_init_cache_dev(node); 329 if (!node->cache_dev) 330 return; 331 332 info = kzalloc(sizeof(*info), GFP_KERNEL); 333 if (!info) 334 return; 335 336 dev = &info->dev; 337 device_initialize(dev); 338 dev->parent = node->cache_dev; 339 dev->release = node_cacheinfo_release; 340 dev->groups = cache_groups; 341 if (dev_set_name(dev, "index%d", cache_attrs->level)) 342 goto put_device; 343 344 info->cache_attrs = *cache_attrs; 345 if (device_add(dev)) { 346 dev_warn(&node->dev, "failed to add cache level:%d\n", 347 cache_attrs->level); 348 goto put_device; 349 } 350 pm_runtime_no_callbacks(dev); 351 list_add_tail(&info->node, &node->cache_attrs); 352 return; 353 put_device: 354 put_device(dev); 355 } 356 357 static void node_remove_caches(struct node *node) 358 { 359 struct node_cache_info *info, *next; 360 361 if (!node->cache_dev) 362 return; 363 364 list_for_each_entry_safe(info, next, &node->cache_attrs, node) { 365 list_del(&info->node); 366 device_unregister(&info->dev); 367 } 368 device_unregister(node->cache_dev); 369 } 370 371 static void node_init_caches(unsigned int nid) 372 { 373 INIT_LIST_HEAD(&node_devices[nid]->cache_attrs); 374 } 375 #else 376 static void node_init_caches(unsigned int nid) { } 377 static void node_remove_caches(struct node *node) { } 378 #endif 379 380 #define K(x) ((x) << (PAGE_SHIFT - 10)) 381 static ssize_t node_read_meminfo(struct device *dev, 382 struct device_attribute *attr, char *buf) 383 { 384 int len = 0; 385 int nid = dev->id; 386 struct pglist_data *pgdat = NODE_DATA(nid); 387 struct sysinfo i; 388 unsigned long sreclaimable, sunreclaimable; 389 unsigned long swapcached = 0; 390 391 si_meminfo_node(&i, nid); 392 sreclaimable = node_page_state_pages(pgdat, NR_SLAB_RECLAIMABLE_B); 393 sunreclaimable = node_page_state_pages(pgdat, NR_SLAB_UNRECLAIMABLE_B); 394 #ifdef CONFIG_SWAP 395 swapcached = node_page_state_pages(pgdat, NR_SWAPCACHE); 396 #endif 397 len = sysfs_emit_at(buf, len, 398 "Node %d MemTotal: %8lu kB\n" 399 "Node %d MemFree: %8lu kB\n" 400 "Node %d MemUsed: %8lu kB\n" 401 "Node %d SwapCached: %8lu kB\n" 402 "Node %d Active: %8lu kB\n" 403 "Node %d Inactive: %8lu kB\n" 404 "Node %d Active(anon): %8lu kB\n" 405 "Node %d Inactive(anon): %8lu kB\n" 406 "Node %d Active(file): %8lu kB\n" 407 "Node %d Inactive(file): %8lu kB\n" 408 "Node %d Unevictable: %8lu kB\n" 409 "Node %d Mlocked: %8lu kB\n", 410 nid, K(i.totalram), 411 nid, K(i.freeram), 412 nid, K(i.totalram - i.freeram), 413 nid, K(swapcached), 414 nid, K(node_page_state(pgdat, NR_ACTIVE_ANON) + 415 node_page_state(pgdat, NR_ACTIVE_FILE)), 416 nid, K(node_page_state(pgdat, NR_INACTIVE_ANON) + 417 node_page_state(pgdat, NR_INACTIVE_FILE)), 418 nid, K(node_page_state(pgdat, NR_ACTIVE_ANON)), 419 nid, K(node_page_state(pgdat, NR_INACTIVE_ANON)), 420 nid, K(node_page_state(pgdat, NR_ACTIVE_FILE)), 421 nid, K(node_page_state(pgdat, NR_INACTIVE_FILE)), 422 nid, K(node_page_state(pgdat, NR_UNEVICTABLE)), 423 nid, K(sum_zone_node_page_state(nid, NR_MLOCK))); 424 425 #ifdef CONFIG_HIGHMEM 426 len += sysfs_emit_at(buf, len, 427 "Node %d HighTotal: %8lu kB\n" 428 "Node %d HighFree: %8lu kB\n" 429 "Node %d LowTotal: %8lu kB\n" 430 "Node %d LowFree: %8lu kB\n", 431 nid, K(i.totalhigh), 432 nid, K(i.freehigh), 433 nid, K(i.totalram - i.totalhigh), 434 nid, K(i.freeram - i.freehigh)); 435 #endif 436 len += sysfs_emit_at(buf, len, 437 "Node %d Dirty: %8lu kB\n" 438 "Node %d Writeback: %8lu kB\n" 439 "Node %d FilePages: %8lu kB\n" 440 "Node %d Mapped: %8lu kB\n" 441 "Node %d AnonPages: %8lu kB\n" 442 "Node %d Shmem: %8lu kB\n" 443 "Node %d KernelStack: %8lu kB\n" 444 #ifdef CONFIG_SHADOW_CALL_STACK 445 "Node %d ShadowCallStack:%8lu kB\n" 446 #endif 447 "Node %d PageTables: %8lu kB\n" 448 "Node %d SecPageTables: %8lu kB\n" 449 "Node %d NFS_Unstable: %8lu kB\n" 450 "Node %d Bounce: %8lu kB\n" 451 "Node %d WritebackTmp: %8lu kB\n" 452 "Node %d KReclaimable: %8lu kB\n" 453 "Node %d Slab: %8lu kB\n" 454 "Node %d SReclaimable: %8lu kB\n" 455 "Node %d SUnreclaim: %8lu kB\n" 456 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 457 "Node %d AnonHugePages: %8lu kB\n" 458 "Node %d ShmemHugePages: %8lu kB\n" 459 "Node %d ShmemPmdMapped: %8lu kB\n" 460 "Node %d FileHugePages: %8lu kB\n" 461 "Node %d FilePmdMapped: %8lu kB\n" 462 #endif 463 #ifdef CONFIG_UNACCEPTED_MEMORY 464 "Node %d Unaccepted: %8lu kB\n" 465 #endif 466 , 467 nid, K(node_page_state(pgdat, NR_FILE_DIRTY)), 468 nid, K(node_page_state(pgdat, NR_WRITEBACK)), 469 nid, K(node_page_state(pgdat, NR_FILE_PAGES)), 470 nid, K(node_page_state(pgdat, NR_FILE_MAPPED)), 471 nid, K(node_page_state(pgdat, NR_ANON_MAPPED)), 472 nid, K(i.sharedram), 473 nid, node_page_state(pgdat, NR_KERNEL_STACK_KB), 474 #ifdef CONFIG_SHADOW_CALL_STACK 475 nid, node_page_state(pgdat, NR_KERNEL_SCS_KB), 476 #endif 477 nid, K(node_page_state(pgdat, NR_PAGETABLE)), 478 nid, K(node_page_state(pgdat, NR_SECONDARY_PAGETABLE)), 479 nid, 0UL, 480 nid, 0UL, 481 nid, K(node_page_state(pgdat, NR_WRITEBACK_TEMP)), 482 nid, K(sreclaimable + 483 node_page_state(pgdat, NR_KERNEL_MISC_RECLAIMABLE)), 484 nid, K(sreclaimable + sunreclaimable), 485 nid, K(sreclaimable), 486 nid, K(sunreclaimable) 487 #ifdef CONFIG_TRANSPARENT_HUGEPAGE 488 , 489 nid, K(node_page_state(pgdat, NR_ANON_THPS)), 490 nid, K(node_page_state(pgdat, NR_SHMEM_THPS)), 491 nid, K(node_page_state(pgdat, NR_SHMEM_PMDMAPPED)), 492 nid, K(node_page_state(pgdat, NR_FILE_THPS)), 493 nid, K(node_page_state(pgdat, NR_FILE_PMDMAPPED)) 494 #endif 495 #ifdef CONFIG_UNACCEPTED_MEMORY 496 , 497 nid, K(sum_zone_node_page_state(nid, NR_UNACCEPTED)) 498 #endif 499 ); 500 len += hugetlb_report_node_meminfo(buf, len, nid); 501 return len; 502 } 503 504 #undef K 505 static DEVICE_ATTR(meminfo, 0444, node_read_meminfo, NULL); 506 507 static ssize_t node_read_numastat(struct device *dev, 508 struct device_attribute *attr, char *buf) 509 { 510 fold_vm_numa_events(); 511 return sysfs_emit(buf, 512 "numa_hit %lu\n" 513 "numa_miss %lu\n" 514 "numa_foreign %lu\n" 515 "interleave_hit %lu\n" 516 "local_node %lu\n" 517 "other_node %lu\n", 518 sum_zone_numa_event_state(dev->id, NUMA_HIT), 519 sum_zone_numa_event_state(dev->id, NUMA_MISS), 520 sum_zone_numa_event_state(dev->id, NUMA_FOREIGN), 521 sum_zone_numa_event_state(dev->id, NUMA_INTERLEAVE_HIT), 522 sum_zone_numa_event_state(dev->id, NUMA_LOCAL), 523 sum_zone_numa_event_state(dev->id, NUMA_OTHER)); 524 } 525 static DEVICE_ATTR(numastat, 0444, node_read_numastat, NULL); 526 527 static ssize_t node_read_vmstat(struct device *dev, 528 struct device_attribute *attr, char *buf) 529 { 530 int nid = dev->id; 531 struct pglist_data *pgdat = NODE_DATA(nid); 532 int i; 533 int len = 0; 534 535 for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++) 536 len += sysfs_emit_at(buf, len, "%s %lu\n", 537 zone_stat_name(i), 538 sum_zone_node_page_state(nid, i)); 539 540 #ifdef CONFIG_NUMA 541 fold_vm_numa_events(); 542 for (i = 0; i < NR_VM_NUMA_EVENT_ITEMS; i++) 543 len += sysfs_emit_at(buf, len, "%s %lu\n", 544 numa_stat_name(i), 545 sum_zone_numa_event_state(nid, i)); 546 547 #endif 548 for (i = 0; i < NR_VM_NODE_STAT_ITEMS; i++) { 549 unsigned long pages = node_page_state_pages(pgdat, i); 550 551 if (vmstat_item_print_in_thp(i)) 552 pages /= HPAGE_PMD_NR; 553 len += sysfs_emit_at(buf, len, "%s %lu\n", node_stat_name(i), 554 pages); 555 } 556 557 return len; 558 } 559 static DEVICE_ATTR(vmstat, 0444, node_read_vmstat, NULL); 560 561 static ssize_t node_read_distance(struct device *dev, 562 struct device_attribute *attr, char *buf) 563 { 564 int nid = dev->id; 565 int len = 0; 566 int i; 567 568 /* 569 * buf is currently PAGE_SIZE in length and each node needs 4 chars 570 * at the most (distance + space or newline). 571 */ 572 BUILD_BUG_ON(MAX_NUMNODES * 4 > PAGE_SIZE); 573 574 for_each_online_node(i) { 575 len += sysfs_emit_at(buf, len, "%s%d", 576 i ? " " : "", node_distance(nid, i)); 577 } 578 579 len += sysfs_emit_at(buf, len, "\n"); 580 return len; 581 } 582 static DEVICE_ATTR(distance, 0444, node_read_distance, NULL); 583 584 static struct attribute *node_dev_attrs[] = { 585 &dev_attr_meminfo.attr, 586 &dev_attr_numastat.attr, 587 &dev_attr_distance.attr, 588 &dev_attr_vmstat.attr, 589 NULL 590 }; 591 592 static const struct bin_attribute *node_dev_bin_attrs[] = { 593 &bin_attr_cpumap, 594 &bin_attr_cpulist, 595 NULL 596 }; 597 598 static const struct attribute_group node_dev_group = { 599 .attrs = node_dev_attrs, 600 .bin_attrs_new = node_dev_bin_attrs, 601 }; 602 603 static const struct attribute_group *node_dev_groups[] = { 604 &node_dev_group, 605 #ifdef CONFIG_HAVE_ARCH_NODE_DEV_GROUP 606 &arch_node_dev_group, 607 #endif 608 #ifdef CONFIG_MEMORY_FAILURE 609 &memory_failure_attr_group, 610 #endif 611 NULL 612 }; 613 614 static void node_device_release(struct device *dev) 615 { 616 kfree(to_node(dev)); 617 } 618 619 /* 620 * register_node - Setup a sysfs device for a node. 621 * @num - Node number to use when creating the device. 622 * 623 * Initialize and register the node device. 624 */ 625 static int register_node(struct node *node, int num) 626 { 627 int error; 628 629 node->dev.id = num; 630 node->dev.bus = &node_subsys; 631 node->dev.release = node_device_release; 632 node->dev.groups = node_dev_groups; 633 error = device_register(&node->dev); 634 635 if (error) { 636 put_device(&node->dev); 637 } else { 638 hugetlb_register_node(node); 639 compaction_register_node(node); 640 } 641 642 return error; 643 } 644 645 /** 646 * unregister_node - unregister a node device 647 * @node: node going away 648 * 649 * Unregisters a node device @node. All the devices on the node must be 650 * unregistered before calling this function. 651 */ 652 void unregister_node(struct node *node) 653 { 654 hugetlb_unregister_node(node); 655 compaction_unregister_node(node); 656 node_remove_accesses(node); 657 node_remove_caches(node); 658 device_unregister(&node->dev); 659 } 660 661 struct node *node_devices[MAX_NUMNODES]; 662 663 /* 664 * register cpu under node 665 */ 666 int register_cpu_under_node(unsigned int cpu, unsigned int nid) 667 { 668 int ret; 669 struct device *obj; 670 671 if (!node_online(nid)) 672 return 0; 673 674 obj = get_cpu_device(cpu); 675 if (!obj) 676 return 0; 677 678 ret = sysfs_create_link(&node_devices[nid]->dev.kobj, 679 &obj->kobj, 680 kobject_name(&obj->kobj)); 681 if (ret) 682 return ret; 683 684 return sysfs_create_link(&obj->kobj, 685 &node_devices[nid]->dev.kobj, 686 kobject_name(&node_devices[nid]->dev.kobj)); 687 } 688 689 /** 690 * register_memory_node_under_compute_node - link memory node to its compute 691 * node for a given access class. 692 * @mem_nid: Memory node number 693 * @cpu_nid: Cpu node number 694 * @access: Access class to register 695 * 696 * Description: 697 * For use with platforms that may have separate memory and compute nodes. 698 * This function will export node relationships linking which memory 699 * initiator nodes can access memory targets at a given ranked access 700 * class. 701 */ 702 int register_memory_node_under_compute_node(unsigned int mem_nid, 703 unsigned int cpu_nid, 704 enum access_coordinate_class access) 705 { 706 struct node *init_node, *targ_node; 707 struct node_access_nodes *initiator, *target; 708 int ret; 709 710 if (!node_online(cpu_nid) || !node_online(mem_nid)) 711 return -ENODEV; 712 713 init_node = node_devices[cpu_nid]; 714 targ_node = node_devices[mem_nid]; 715 initiator = node_init_node_access(init_node, access); 716 target = node_init_node_access(targ_node, access); 717 if (!initiator || !target) 718 return -ENOMEM; 719 720 ret = sysfs_add_link_to_group(&initiator->dev.kobj, "targets", 721 &targ_node->dev.kobj, 722 dev_name(&targ_node->dev)); 723 if (ret) 724 return ret; 725 726 ret = sysfs_add_link_to_group(&target->dev.kobj, "initiators", 727 &init_node->dev.kobj, 728 dev_name(&init_node->dev)); 729 if (ret) 730 goto err; 731 732 return 0; 733 err: 734 sysfs_remove_link_from_group(&initiator->dev.kobj, "targets", 735 dev_name(&targ_node->dev)); 736 return ret; 737 } 738 739 int unregister_cpu_under_node(unsigned int cpu, unsigned int nid) 740 { 741 struct device *obj; 742 743 if (!node_online(nid)) 744 return 0; 745 746 obj = get_cpu_device(cpu); 747 if (!obj) 748 return 0; 749 750 sysfs_remove_link(&node_devices[nid]->dev.kobj, 751 kobject_name(&obj->kobj)); 752 sysfs_remove_link(&obj->kobj, 753 kobject_name(&node_devices[nid]->dev.kobj)); 754 755 return 0; 756 } 757 758 #ifdef CONFIG_MEMORY_HOTPLUG 759 static int __ref get_nid_for_pfn(unsigned long pfn) 760 { 761 #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT 762 if (system_state < SYSTEM_RUNNING) 763 return early_pfn_to_nid(pfn); 764 #endif 765 return pfn_to_nid(pfn); 766 } 767 768 static void do_register_memory_block_under_node(int nid, 769 struct memory_block *mem_blk, 770 enum meminit_context context) 771 { 772 int ret; 773 774 memory_block_add_nid(mem_blk, nid, context); 775 776 ret = sysfs_create_link_nowarn(&node_devices[nid]->dev.kobj, 777 &mem_blk->dev.kobj, 778 kobject_name(&mem_blk->dev.kobj)); 779 if (ret && ret != -EEXIST) 780 dev_err_ratelimited(&node_devices[nid]->dev, 781 "can't create link to %s in sysfs (%d)\n", 782 kobject_name(&mem_blk->dev.kobj), ret); 783 784 ret = sysfs_create_link_nowarn(&mem_blk->dev.kobj, 785 &node_devices[nid]->dev.kobj, 786 kobject_name(&node_devices[nid]->dev.kobj)); 787 if (ret && ret != -EEXIST) 788 dev_err_ratelimited(&mem_blk->dev, 789 "can't create link to %s in sysfs (%d)\n", 790 kobject_name(&node_devices[nid]->dev.kobj), 791 ret); 792 } 793 794 /* register memory section under specified node if it spans that node */ 795 static int register_mem_block_under_node_early(struct memory_block *mem_blk, 796 void *arg) 797 { 798 unsigned long memory_block_pfns = memory_block_size_bytes() / PAGE_SIZE; 799 unsigned long start_pfn = section_nr_to_pfn(mem_blk->start_section_nr); 800 unsigned long end_pfn = start_pfn + memory_block_pfns - 1; 801 int nid = *(int *)arg; 802 unsigned long pfn; 803 804 for (pfn = start_pfn; pfn <= end_pfn; pfn++) { 805 int page_nid; 806 807 /* 808 * memory block could have several absent sections from start. 809 * skip pfn range from absent section 810 */ 811 if (!pfn_in_present_section(pfn)) { 812 pfn = round_down(pfn + PAGES_PER_SECTION, 813 PAGES_PER_SECTION) - 1; 814 continue; 815 } 816 817 /* 818 * We need to check if page belongs to nid only at the boot 819 * case because node's ranges can be interleaved. 820 */ 821 page_nid = get_nid_for_pfn(pfn); 822 if (page_nid < 0) 823 continue; 824 if (page_nid != nid) 825 continue; 826 827 do_register_memory_block_under_node(nid, mem_blk, MEMINIT_EARLY); 828 return 0; 829 } 830 /* mem section does not span the specified node */ 831 return 0; 832 } 833 834 /* 835 * During hotplug we know that all pages in the memory block belong to the same 836 * node. 837 */ 838 static int register_mem_block_under_node_hotplug(struct memory_block *mem_blk, 839 void *arg) 840 { 841 int nid = *(int *)arg; 842 843 do_register_memory_block_under_node(nid, mem_blk, MEMINIT_HOTPLUG); 844 return 0; 845 } 846 847 /* 848 * Unregister a memory block device under the node it spans. Memory blocks 849 * with multiple nodes cannot be offlined and therefore also never be removed. 850 */ 851 void unregister_memory_block_under_nodes(struct memory_block *mem_blk) 852 { 853 if (mem_blk->nid == NUMA_NO_NODE) 854 return; 855 856 sysfs_remove_link(&node_devices[mem_blk->nid]->dev.kobj, 857 kobject_name(&mem_blk->dev.kobj)); 858 sysfs_remove_link(&mem_blk->dev.kobj, 859 kobject_name(&node_devices[mem_blk->nid]->dev.kobj)); 860 } 861 862 void register_memory_blocks_under_node(int nid, unsigned long start_pfn, 863 unsigned long end_pfn, 864 enum meminit_context context) 865 { 866 walk_memory_blocks_func_t func; 867 868 if (context == MEMINIT_HOTPLUG) 869 func = register_mem_block_under_node_hotplug; 870 else 871 func = register_mem_block_under_node_early; 872 873 walk_memory_blocks(PFN_PHYS(start_pfn), PFN_PHYS(end_pfn - start_pfn), 874 (void *)&nid, func); 875 return; 876 } 877 #endif /* CONFIG_MEMORY_HOTPLUG */ 878 879 int __register_one_node(int nid) 880 { 881 int error; 882 int cpu; 883 struct node *node; 884 885 node = kzalloc(sizeof(struct node), GFP_KERNEL); 886 if (!node) 887 return -ENOMEM; 888 889 INIT_LIST_HEAD(&node->access_list); 890 node_devices[nid] = node; 891 892 error = register_node(node_devices[nid], nid); 893 894 /* link cpu under this node */ 895 for_each_present_cpu(cpu) { 896 if (cpu_to_node(cpu) == nid) 897 register_cpu_under_node(cpu, nid); 898 } 899 900 node_init_caches(nid); 901 902 return error; 903 } 904 905 void unregister_one_node(int nid) 906 { 907 if (!node_devices[nid]) 908 return; 909 910 unregister_node(node_devices[nid]); 911 node_devices[nid] = NULL; 912 } 913 914 /* 915 * node states attributes 916 */ 917 918 struct node_attr { 919 struct device_attribute attr; 920 enum node_states state; 921 }; 922 923 static ssize_t show_node_state(struct device *dev, 924 struct device_attribute *attr, char *buf) 925 { 926 struct node_attr *na = container_of(attr, struct node_attr, attr); 927 928 return sysfs_emit(buf, "%*pbl\n", 929 nodemask_pr_args(&node_states[na->state])); 930 } 931 932 #define _NODE_ATTR(name, state) \ 933 { __ATTR(name, 0444, show_node_state, NULL), state } 934 935 static struct node_attr node_state_attr[] = { 936 [N_POSSIBLE] = _NODE_ATTR(possible, N_POSSIBLE), 937 [N_ONLINE] = _NODE_ATTR(online, N_ONLINE), 938 [N_NORMAL_MEMORY] = _NODE_ATTR(has_normal_memory, N_NORMAL_MEMORY), 939 #ifdef CONFIG_HIGHMEM 940 [N_HIGH_MEMORY] = _NODE_ATTR(has_high_memory, N_HIGH_MEMORY), 941 #endif 942 [N_MEMORY] = _NODE_ATTR(has_memory, N_MEMORY), 943 [N_CPU] = _NODE_ATTR(has_cpu, N_CPU), 944 [N_GENERIC_INITIATOR] = _NODE_ATTR(has_generic_initiator, 945 N_GENERIC_INITIATOR), 946 }; 947 948 static struct attribute *node_state_attrs[] = { 949 &node_state_attr[N_POSSIBLE].attr.attr, 950 &node_state_attr[N_ONLINE].attr.attr, 951 &node_state_attr[N_NORMAL_MEMORY].attr.attr, 952 #ifdef CONFIG_HIGHMEM 953 &node_state_attr[N_HIGH_MEMORY].attr.attr, 954 #endif 955 &node_state_attr[N_MEMORY].attr.attr, 956 &node_state_attr[N_CPU].attr.attr, 957 &node_state_attr[N_GENERIC_INITIATOR].attr.attr, 958 NULL 959 }; 960 961 static const struct attribute_group memory_root_attr_group = { 962 .attrs = node_state_attrs, 963 }; 964 965 static const struct attribute_group *cpu_root_attr_groups[] = { 966 &memory_root_attr_group, 967 NULL, 968 }; 969 970 void __init node_dev_init(void) 971 { 972 int ret, i; 973 974 BUILD_BUG_ON(ARRAY_SIZE(node_state_attr) != NR_NODE_STATES); 975 BUILD_BUG_ON(ARRAY_SIZE(node_state_attrs)-1 != NR_NODE_STATES); 976 977 ret = subsys_system_register(&node_subsys, cpu_root_attr_groups); 978 if (ret) 979 panic("%s() failed to register subsystem: %d\n", __func__, ret); 980 981 /* 982 * Create all node devices, which will properly link the node 983 * to applicable memory block devices and already created cpu devices. 984 */ 985 for_each_online_node(i) { 986 ret = register_one_node(i); 987 if (ret) 988 panic("%s() failed to add node: %d\n", __func__, ret); 989 } 990 } 991