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