1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * acpi_numa.c - ACPI NUMA support 4 * 5 * Copyright (C) 2002 Takayoshi Kochi <t-kochi@bq.jp.nec.com> 6 */ 7 8 #define pr_fmt(fmt) "ACPI: " fmt 9 10 #include <linux/module.h> 11 #include <linux/init.h> 12 #include <linux/kernel.h> 13 #include <linux/types.h> 14 #include <linux/errno.h> 15 #include <linux/acpi.h> 16 #include <linux/memblock.h> 17 #include <linux/numa.h> 18 #include <linux/nodemask.h> 19 #include <linux/topology.h> 20 #include <linux/numa_memblks.h> 21 22 static nodemask_t nodes_found_map = NODE_MASK_NONE; 23 24 /* maps to convert between proximity domain and logical node ID */ 25 static int pxm_to_node_map[MAX_PXM_DOMAINS] 26 = { [0 ... MAX_PXM_DOMAINS - 1] = NUMA_NO_NODE }; 27 static int node_to_pxm_map[MAX_NUMNODES] 28 = { [0 ... MAX_NUMNODES - 1] = PXM_INVAL }; 29 30 unsigned char acpi_srat_revision __initdata; 31 static int acpi_numa __initdata; 32 33 static int last_real_pxm; 34 35 void __init disable_srat(void) 36 { 37 acpi_numa = -1; 38 } 39 40 int pxm_to_node(int pxm) 41 { 42 if (pxm < 0 || pxm >= MAX_PXM_DOMAINS || numa_off) 43 return NUMA_NO_NODE; 44 return pxm_to_node_map[pxm]; 45 } 46 EXPORT_SYMBOL(pxm_to_node); 47 48 int node_to_pxm(int node) 49 { 50 if (node < 0) 51 return PXM_INVAL; 52 return node_to_pxm_map[node]; 53 } 54 55 static void __acpi_map_pxm_to_node(int pxm, int node) 56 { 57 if (pxm_to_node_map[pxm] == NUMA_NO_NODE || node < pxm_to_node_map[pxm]) 58 pxm_to_node_map[pxm] = node; 59 if (node_to_pxm_map[node] == PXM_INVAL || pxm < node_to_pxm_map[node]) 60 node_to_pxm_map[node] = pxm; 61 } 62 63 int acpi_map_pxm_to_node(int pxm) 64 { 65 int node; 66 67 if (pxm < 0 || pxm >= MAX_PXM_DOMAINS || numa_off) 68 return NUMA_NO_NODE; 69 70 node = pxm_to_node_map[pxm]; 71 72 if (node == NUMA_NO_NODE) { 73 node = first_unset_node(nodes_found_map); 74 if (node >= MAX_NUMNODES) 75 return NUMA_NO_NODE; 76 __acpi_map_pxm_to_node(pxm, node); 77 node_set(node, nodes_found_map); 78 } 79 80 return node; 81 } 82 EXPORT_SYMBOL(acpi_map_pxm_to_node); 83 84 static void __init 85 acpi_table_print_srat_entry(struct acpi_subtable_header *header) 86 { 87 switch (header->type) { 88 case ACPI_SRAT_TYPE_CPU_AFFINITY: 89 { 90 struct acpi_srat_cpu_affinity *p = 91 (struct acpi_srat_cpu_affinity *)header; 92 pr_debug("SRAT Processor (id[0x%02x] eid[0x%02x]) in proximity domain %d %s\n", 93 p->apic_id, p->local_sapic_eid, 94 p->proximity_domain_lo, 95 (p->flags & ACPI_SRAT_CPU_ENABLED) ? 96 "enabled" : "disabled"); 97 } 98 break; 99 100 case ACPI_SRAT_TYPE_MEMORY_AFFINITY: 101 { 102 struct acpi_srat_mem_affinity *p = 103 (struct acpi_srat_mem_affinity *)header; 104 pr_debug("SRAT Memory (0x%llx length 0x%llx) in proximity domain %d %s%s%s\n", 105 (unsigned long long)p->base_address, 106 (unsigned long long)p->length, 107 p->proximity_domain, 108 (p->flags & ACPI_SRAT_MEM_ENABLED) ? 109 "enabled" : "disabled", 110 (p->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) ? 111 " hot-pluggable" : "", 112 (p->flags & ACPI_SRAT_MEM_NON_VOLATILE) ? 113 " non-volatile" : ""); 114 } 115 break; 116 117 case ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY: 118 { 119 struct acpi_srat_x2apic_cpu_affinity *p = 120 (struct acpi_srat_x2apic_cpu_affinity *)header; 121 pr_debug("SRAT Processor (x2apicid[0x%08x]) in proximity domain %d %s\n", 122 p->apic_id, 123 p->proximity_domain, 124 (p->flags & ACPI_SRAT_CPU_ENABLED) ? 125 "enabled" : "disabled"); 126 } 127 break; 128 129 case ACPI_SRAT_TYPE_GICC_AFFINITY: 130 { 131 struct acpi_srat_gicc_affinity *p = 132 (struct acpi_srat_gicc_affinity *)header; 133 pr_debug("SRAT Processor (acpi id[0x%04x]) in proximity domain %d %s\n", 134 p->acpi_processor_uid, 135 p->proximity_domain, 136 (p->flags & ACPI_SRAT_GICC_ENABLED) ? 137 "enabled" : "disabled"); 138 } 139 break; 140 141 case ACPI_SRAT_TYPE_GENERIC_AFFINITY: 142 { 143 struct acpi_srat_generic_affinity *p = 144 (struct acpi_srat_generic_affinity *)header; 145 146 if (p->device_handle_type == 0) { 147 /* 148 * For pci devices this may be the only place they 149 * are assigned a proximity domain 150 */ 151 pr_debug("SRAT Generic Initiator(Seg:%u BDF:%u) in proximity domain %d %s\n", 152 *(u16 *)(&p->device_handle[0]), 153 *(u16 *)(&p->device_handle[2]), 154 p->proximity_domain, 155 (p->flags & ACPI_SRAT_GENERIC_AFFINITY_ENABLED) ? 156 "enabled" : "disabled"); 157 } else { 158 /* 159 * In this case we can rely on the device having a 160 * proximity domain reference 161 */ 162 pr_debug("SRAT Generic Initiator(HID=%.8s UID=%.4s) in proximity domain %d %s\n", 163 (char *)(&p->device_handle[0]), 164 (char *)(&p->device_handle[8]), 165 p->proximity_domain, 166 (p->flags & ACPI_SRAT_GENERIC_AFFINITY_ENABLED) ? 167 "enabled" : "disabled"); 168 } 169 } 170 break; 171 172 case ACPI_SRAT_TYPE_RINTC_AFFINITY: 173 { 174 struct acpi_srat_rintc_affinity *p = 175 (struct acpi_srat_rintc_affinity *)header; 176 pr_debug("SRAT Processor (acpi id[0x%04x]) in proximity domain %d %s\n", 177 p->acpi_processor_uid, 178 p->proximity_domain, 179 (p->flags & ACPI_SRAT_RINTC_ENABLED) ? 180 "enabled" : "disabled"); 181 } 182 break; 183 184 default: 185 pr_warn("Found unsupported SRAT entry (type = 0x%x)\n", 186 header->type); 187 break; 188 } 189 } 190 191 /* 192 * A lot of BIOS fill in 10 (= no distance) everywhere. This messes 193 * up the NUMA heuristics which wants the local node to have a smaller 194 * distance than the others. 195 * Do some quick checks here and only use the SLIT if it passes. 196 */ 197 static int __init slit_valid(struct acpi_table_slit *slit) 198 { 199 int i, j; 200 int d = slit->locality_count; 201 for (i = 0; i < d; i++) { 202 for (j = 0; j < d; j++) { 203 u8 val = slit->entry[d*i + j]; 204 if (i == j) { 205 if (val != LOCAL_DISTANCE) 206 return 0; 207 } else if (val <= LOCAL_DISTANCE) 208 return 0; 209 } 210 } 211 return 1; 212 } 213 214 void __init bad_srat(void) 215 { 216 pr_err("SRAT: SRAT not used.\n"); 217 disable_srat(); 218 } 219 220 int __init srat_disabled(void) 221 { 222 return acpi_numa < 0; 223 } 224 225 __weak int __init numa_fill_memblks(u64 start, u64 end) 226 { 227 return NUMA_NO_MEMBLK; 228 } 229 230 /* 231 * Callback for SLIT parsing. pxm_to_node() returns NUMA_NO_NODE for 232 * I/O localities since SRAT does not list them. I/O localities are 233 * not supported at this point. 234 */ 235 static int __init acpi_parse_slit(struct acpi_table_header *table) 236 { 237 struct acpi_table_slit *slit = (struct acpi_table_slit *)table; 238 int i, j; 239 240 if (!slit_valid(slit)) { 241 pr_info("SLIT table looks invalid. Not used.\n"); 242 return -EINVAL; 243 } 244 245 for (i = 0; i < slit->locality_count; i++) { 246 const int from_node = pxm_to_node(i); 247 248 if (from_node == NUMA_NO_NODE) 249 continue; 250 251 for (j = 0; j < slit->locality_count; j++) { 252 const int to_node = pxm_to_node(j); 253 254 if (to_node == NUMA_NO_NODE) 255 continue; 256 257 numa_set_distance(from_node, to_node, 258 slit->entry[slit->locality_count * i + j]); 259 } 260 } 261 262 return 0; 263 } 264 265 static int parsed_numa_memblks __initdata; 266 267 static int __init 268 acpi_parse_memory_affinity(union acpi_subtable_headers *header, 269 const unsigned long table_end) 270 { 271 struct acpi_srat_mem_affinity *ma; 272 u64 start, end; 273 u32 hotpluggable; 274 int node, pxm; 275 276 ma = (struct acpi_srat_mem_affinity *)header; 277 278 acpi_table_print_srat_entry(&header->common); 279 280 if (srat_disabled()) 281 return 0; 282 if (ma->header.length < sizeof(struct acpi_srat_mem_affinity)) { 283 pr_err("SRAT: Unexpected header length: %d\n", 284 ma->header.length); 285 goto out_err_bad_srat; 286 } 287 if ((ma->flags & ACPI_SRAT_MEM_ENABLED) == 0) 288 return 0; 289 hotpluggable = IS_ENABLED(CONFIG_MEMORY_HOTPLUG) && 290 (ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE); 291 292 start = ma->base_address; 293 end = start + ma->length; 294 pxm = ma->proximity_domain; 295 if (acpi_srat_revision <= 1) 296 pxm &= 0xff; 297 298 node = acpi_map_pxm_to_node(pxm); 299 if (node == NUMA_NO_NODE) { 300 pr_err("SRAT: Too many proximity domains.\n"); 301 goto out_err_bad_srat; 302 } 303 304 if (numa_add_memblk(node, start, end) < 0) { 305 pr_err("SRAT: Failed to add memblk to node %u [mem %#010Lx-%#010Lx]\n", 306 node, (unsigned long long) start, 307 (unsigned long long) end - 1); 308 goto out_err_bad_srat; 309 } 310 311 node_set(node, numa_nodes_parsed); 312 313 pr_info("SRAT: Node %u PXM %u [mem %#010Lx-%#010Lx]%s%s\n", 314 node, pxm, 315 (unsigned long long) start, (unsigned long long) end - 1, 316 hotpluggable ? " hotplug" : "", 317 ma->flags & ACPI_SRAT_MEM_NON_VOLATILE ? " non-volatile" : ""); 318 319 /* Mark hotplug range in memblock. */ 320 if (hotpluggable && memblock_mark_hotplug(start, ma->length)) 321 pr_warn("SRAT: Failed to mark hotplug range [mem %#010Lx-%#010Lx] in memblock\n", 322 (unsigned long long)start, (unsigned long long)end - 1); 323 324 max_possible_pfn = max(max_possible_pfn, PFN_UP(end - 1)); 325 326 parsed_numa_memblks++; 327 328 return 0; 329 330 out_err_bad_srat: 331 /* Just disable SRAT, but do not fail and ignore errors. */ 332 bad_srat(); 333 334 return 0; 335 } 336 337 static int __init acpi_parse_cfmws(union acpi_subtable_headers *header, 338 void *arg, const unsigned long table_end) 339 { 340 struct acpi_cedt_cfmws *cfmws; 341 int *fake_pxm = arg; 342 u64 start, end; 343 int node; 344 345 cfmws = (struct acpi_cedt_cfmws *)header; 346 start = cfmws->base_hpa; 347 end = cfmws->base_hpa + cfmws->window_size; 348 349 /* 350 * The SRAT may have already described NUMA details for all, 351 * or a portion of, this CFMWS HPA range. Extend the memblks 352 * found for any portion of the window to cover the entire 353 * window. 354 */ 355 if (!numa_fill_memblks(start, end)) 356 return 0; 357 358 /* No SRAT description. Create a new node. */ 359 node = acpi_map_pxm_to_node(*fake_pxm); 360 361 if (node == NUMA_NO_NODE) { 362 pr_err("ACPI NUMA: Too many proximity domains while processing CFMWS.\n"); 363 return -EINVAL; 364 } 365 366 if (numa_add_memblk(node, start, end) < 0) { 367 /* CXL driver must handle the NUMA_NO_NODE case */ 368 pr_warn("ACPI NUMA: Failed to add memblk for CFMWS node %d [mem %#llx-%#llx]\n", 369 node, start, end); 370 } 371 node_set(node, numa_nodes_parsed); 372 373 /* Set the next available fake_pxm value */ 374 (*fake_pxm)++; 375 return 0; 376 } 377 378 void __init __weak 379 acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa) 380 { 381 pr_warn("Found unsupported x2apic [0x%08x] SRAT entry\n", pa->apic_id); 382 } 383 384 static int __init 385 acpi_parse_x2apic_affinity(union acpi_subtable_headers *header, 386 const unsigned long end) 387 { 388 struct acpi_srat_x2apic_cpu_affinity *processor_affinity; 389 390 processor_affinity = (struct acpi_srat_x2apic_cpu_affinity *)header; 391 392 acpi_table_print_srat_entry(&header->common); 393 394 /* let architecture-dependent part to do it */ 395 acpi_numa_x2apic_affinity_init(processor_affinity); 396 397 return 0; 398 } 399 400 static int __init 401 acpi_parse_processor_affinity(union acpi_subtable_headers *header, 402 const unsigned long end) 403 { 404 struct acpi_srat_cpu_affinity *processor_affinity; 405 406 processor_affinity = (struct acpi_srat_cpu_affinity *)header; 407 408 acpi_table_print_srat_entry(&header->common); 409 410 /* let architecture-dependent part to do it */ 411 acpi_numa_processor_affinity_init(processor_affinity); 412 413 return 0; 414 } 415 416 static int __init 417 acpi_parse_gicc_affinity(union acpi_subtable_headers *header, 418 const unsigned long end) 419 { 420 struct acpi_srat_gicc_affinity *processor_affinity; 421 422 processor_affinity = (struct acpi_srat_gicc_affinity *)header; 423 424 acpi_table_print_srat_entry(&header->common); 425 426 /* let architecture-dependent part to do it */ 427 acpi_numa_gicc_affinity_init(processor_affinity); 428 429 return 0; 430 } 431 432 #if defined(CONFIG_X86) || defined(CONFIG_ARM64) 433 static int __init 434 acpi_parse_gi_affinity(union acpi_subtable_headers *header, 435 const unsigned long end) 436 { 437 struct acpi_srat_generic_affinity *gi_affinity; 438 int node; 439 440 gi_affinity = (struct acpi_srat_generic_affinity *)header; 441 if (!gi_affinity) 442 return -EINVAL; 443 acpi_table_print_srat_entry(&header->common); 444 445 if (!(gi_affinity->flags & ACPI_SRAT_GENERIC_AFFINITY_ENABLED)) 446 return -EINVAL; 447 448 node = acpi_map_pxm_to_node(gi_affinity->proximity_domain); 449 if (node == NUMA_NO_NODE) { 450 pr_err("SRAT: Too many proximity domains.\n"); 451 return -EINVAL; 452 } 453 node_set(node, numa_nodes_parsed); 454 node_set_state(node, N_GENERIC_INITIATOR); 455 456 return 0; 457 } 458 #else 459 static int __init 460 acpi_parse_gi_affinity(union acpi_subtable_headers *header, 461 const unsigned long end) 462 { 463 return 0; 464 } 465 #endif /* defined(CONFIG_X86) || defined (CONFIG_ARM64) */ 466 467 static int __init 468 acpi_parse_rintc_affinity(union acpi_subtable_headers *header, 469 const unsigned long end) 470 { 471 struct acpi_srat_rintc_affinity *rintc_affinity; 472 473 rintc_affinity = (struct acpi_srat_rintc_affinity *)header; 474 acpi_table_print_srat_entry(&header->common); 475 476 /* let architecture-dependent part to do it */ 477 acpi_numa_rintc_affinity_init(rintc_affinity); 478 479 return 0; 480 } 481 482 static int __init acpi_parse_srat(struct acpi_table_header *table) 483 { 484 struct acpi_table_srat *srat = (struct acpi_table_srat *)table; 485 486 acpi_srat_revision = srat->header.revision; 487 488 /* Real work done in acpi_table_parse_srat below. */ 489 490 return 0; 491 } 492 493 static int __init 494 acpi_table_parse_srat(enum acpi_srat_type id, 495 acpi_tbl_entry_handler handler, unsigned int max_entries) 496 { 497 return acpi_table_parse_entries(ACPI_SIG_SRAT, 498 sizeof(struct acpi_table_srat), id, 499 handler, max_entries); 500 } 501 502 int __init acpi_numa_init(void) 503 { 504 int i, fake_pxm, cnt = 0; 505 506 if (acpi_disabled) 507 return -EINVAL; 508 509 /* 510 * Should not limit number with cpu num that is from NR_CPUS or nr_cpus= 511 * SRAT cpu entries could have different order with that in MADT. 512 * So go over all cpu entries in SRAT to get apicid to node mapping. 513 */ 514 515 /* SRAT: System Resource Affinity Table */ 516 if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) { 517 struct acpi_subtable_proc srat_proc[5]; 518 519 memset(srat_proc, 0, sizeof(srat_proc)); 520 srat_proc[0].id = ACPI_SRAT_TYPE_CPU_AFFINITY; 521 srat_proc[0].handler = acpi_parse_processor_affinity; 522 srat_proc[1].id = ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY; 523 srat_proc[1].handler = acpi_parse_x2apic_affinity; 524 srat_proc[2].id = ACPI_SRAT_TYPE_GICC_AFFINITY; 525 srat_proc[2].handler = acpi_parse_gicc_affinity; 526 srat_proc[3].id = ACPI_SRAT_TYPE_GENERIC_AFFINITY; 527 srat_proc[3].handler = acpi_parse_gi_affinity; 528 srat_proc[4].id = ACPI_SRAT_TYPE_RINTC_AFFINITY; 529 srat_proc[4].handler = acpi_parse_rintc_affinity; 530 531 acpi_table_parse_entries_array(ACPI_SIG_SRAT, 532 sizeof(struct acpi_table_srat), 533 srat_proc, ARRAY_SIZE(srat_proc), 0); 534 535 cnt = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY, 536 acpi_parse_memory_affinity, 0); 537 } 538 539 /* SLIT: System Locality Information Table */ 540 acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit); 541 542 /* 543 * CXL Fixed Memory Window Structures (CFMWS) must be parsed 544 * after the SRAT. Create NUMA Nodes for CXL memory ranges that 545 * are defined in the CFMWS and not already defined in the SRAT. 546 * Initialize a fake_pxm as the first available PXM to emulate. 547 */ 548 549 /* fake_pxm is the next unused PXM value after SRAT parsing */ 550 for (i = 0, fake_pxm = -1; i < MAX_NUMNODES; i++) { 551 if (node_to_pxm_map[i] > fake_pxm) 552 fake_pxm = node_to_pxm_map[i]; 553 } 554 last_real_pxm = fake_pxm; 555 fake_pxm++; 556 acpi_table_parse_cedt(ACPI_CEDT_TYPE_CFMWS, acpi_parse_cfmws, 557 &fake_pxm); 558 559 if (cnt < 0) 560 return cnt; 561 else if (!parsed_numa_memblks) 562 return -ENOENT; 563 return 0; 564 } 565 566 bool acpi_node_backed_by_real_pxm(int nid) 567 { 568 int pxm = node_to_pxm(nid); 569 570 return pxm <= last_real_pxm; 571 } 572 EXPORT_SYMBOL_GPL(acpi_node_backed_by_real_pxm); 573 574 static int acpi_get_pxm(acpi_handle h) 575 { 576 unsigned long long pxm; 577 acpi_status status; 578 acpi_handle handle; 579 acpi_handle phandle = h; 580 581 do { 582 handle = phandle; 583 status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm); 584 if (ACPI_SUCCESS(status)) 585 return pxm; 586 status = acpi_get_parent(handle, &phandle); 587 } while (ACPI_SUCCESS(status)); 588 return -1; 589 } 590 591 int acpi_get_node(acpi_handle handle) 592 { 593 int pxm; 594 595 pxm = acpi_get_pxm(handle); 596 597 return pxm_to_node(pxm); 598 } 599 EXPORT_SYMBOL(acpi_get_node); 600