drivers/acpi/numa/srat.c

   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
 331         /* Set the next available fake_pxm value */
 332         (*fake_pxm)++;
 333         return 0;
 334 }
 335 #else
 336 static int __init acpi_parse_cfmws(union acpi_subtable_headers *header,
 337                                    void *arg, const unsigned long table_end)
 338 {
 339         return 0;
 340 }
 341 #endif /* defined(CONFIG_X86) || defined (CONFIG_ARM64) */
 342
 343 static int __init acpi_parse_slit(struct acpi_table_header *table)
 344 {
 345         struct acpi_table_slit *slit = (struct acpi_table_slit *)table;
 346
 347         if (!slit_valid(slit)) {
 348                 pr_info("SLIT table looks invalid. Not used.\n");
 349                 return -EINVAL;
 350         }
 351         acpi_numa_slit_init(slit);
 352
 353         return 0;
 354 }
 355
 356 void __init __weak
 357 acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
 358 {
 359         pr_warn("Found unsupported x2apic [0x%08x] SRAT entry\n", pa->apic_id);
 360 }
 361
 362 static int __init
 363 acpi_parse_x2apic_affinity(union acpi_subtable_headers *header,
 364                            const unsigned long end)
 365 {
 366         struct acpi_srat_x2apic_cpu_affinity *processor_affinity;
 367
 368         processor_affinity = (struct acpi_srat_x2apic_cpu_affinity *)header;
 369
 370         acpi_table_print_srat_entry(&header->common);
 371
 372         /* let architecture-dependent part to do it */
 373         acpi_numa_x2apic_affinity_init(processor_affinity);
 374
 375         return 0;
 376 }
 377
 378 static int __init
 379 acpi_parse_processor_affinity(union acpi_subtable_headers *header,
 380                               const unsigned long end)
 381 {
 382         struct acpi_srat_cpu_affinity *processor_affinity;
 383
 384         processor_affinity = (struct acpi_srat_cpu_affinity *)header;
 385
 386         acpi_table_print_srat_entry(&header->common);
 387
 388         /* let architecture-dependent part to do it */
 389         acpi_numa_processor_affinity_init(processor_affinity);
 390
 391         return 0;
 392 }
 393
 394 static int __init
 395 acpi_parse_gicc_affinity(union acpi_subtable_headers *header,
 396                          const unsigned long end)
 397 {
 398         struct acpi_srat_gicc_affinity *processor_affinity;
 399
 400         processor_affinity = (struct acpi_srat_gicc_affinity *)header;
 401
 402         acpi_table_print_srat_entry(&header->common);
 403
 404         /* let architecture-dependent part to do it */
 405         acpi_numa_gicc_affinity_init(processor_affinity);
 406
 407         return 0;
 408 }
 409
 410 #if defined(CONFIG_X86) || defined(CONFIG_ARM64)
 411 static int __init
 412 acpi_parse_gi_affinity(union acpi_subtable_headers *header,
 413                        const unsigned long end)
 414 {
 415         struct acpi_srat_generic_affinity *gi_affinity;
 416         int node;
 417
 418         gi_affinity = (struct acpi_srat_generic_affinity *)header;
 419         if (!gi_affinity)
 420                 return -EINVAL;
 421         acpi_table_print_srat_entry(&header->common);
 422
 423         if (!(gi_affinity->flags & ACPI_SRAT_GENERIC_AFFINITY_ENABLED))
 424                 return -EINVAL;
 425
 426         node = acpi_map_pxm_to_node(gi_affinity->proximity_domain);
 427         if (node == NUMA_NO_NODE || node >= MAX_NUMNODES) {
 428                 pr_err("SRAT: Too many proximity domains.\n");
 429                 return -EINVAL;
 430         }
 431         node_set(node, numa_nodes_parsed);
 432         node_set_state(node, N_GENERIC_INITIATOR);
 433
 434         return 0;
 435 }
 436 #else
 437 static int __init
 438 acpi_parse_gi_affinity(union acpi_subtable_headers *header,
 439                        const unsigned long end)
 440 {
 441         return 0;
 442 }
 443 #endif /* defined(CONFIG_X86) || defined (CONFIG_ARM64) */
 444
 445 static int __initdata parsed_numa_memblks;
 446
 447 static int __init
 448 acpi_parse_memory_affinity(union acpi_subtable_headers * header,
 449                            const unsigned long end)
 450 {
 451         struct acpi_srat_mem_affinity *memory_affinity;
 452
 453         memory_affinity = (struct acpi_srat_mem_affinity *)header;
 454
 455         acpi_table_print_srat_entry(&header->common);
 456
 457         /* let architecture-dependent part to do it */
 458         if (!acpi_numa_memory_affinity_init(memory_affinity))
 459                 parsed_numa_memblks++;
 460         return 0;
 461 }
 462
 463 static int __init acpi_parse_srat(struct acpi_table_header *table)
 464 {
 465         struct acpi_table_srat *srat = (struct acpi_table_srat *)table;
 466
 467         acpi_srat_revision = srat->header.revision;
 468
 469         /* Real work done in acpi_table_parse_srat below. */
 470
 471         return 0;
 472 }
 473
 474 static int __init
 475 acpi_table_parse_srat(enum acpi_srat_type id,
 476                       acpi_tbl_entry_handler handler, unsigned int max_entries)
 477 {
 478         return acpi_table_parse_entries(ACPI_SIG_SRAT,
 479                                             sizeof(struct acpi_table_srat), id,
 480                                             handler, max_entries);
 481 }
 482
 483 int __init acpi_numa_init(void)
 484 {
 485         int i, fake_pxm, cnt = 0;
 486
 487         if (acpi_disabled)
 488                 return -EINVAL;
 489
 490         /*
 491          * Should not limit number with cpu num that is from NR_CPUS or nr_cpus=
 492          * SRAT cpu entries could have different order with that in MADT.
 493          * So go over all cpu entries in SRAT to get apicid to node mapping.
 494          */
 495
 496         /* SRAT: System Resource Affinity Table */
 497         if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) {
 498                 struct acpi_subtable_proc srat_proc[4];
 499
 500                 memset(srat_proc, 0, sizeof(srat_proc));
 501                 srat_proc[0].id = ACPI_SRAT_TYPE_CPU_AFFINITY;
 502                 srat_proc[0].handler = acpi_parse_processor_affinity;
 503                 srat_proc[1].id = ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY;
 504                 srat_proc[1].handler = acpi_parse_x2apic_affinity;
 505                 srat_proc[2].id = ACPI_SRAT_TYPE_GICC_AFFINITY;
 506                 srat_proc[2].handler = acpi_parse_gicc_affinity;
 507                 srat_proc[3].id = ACPI_SRAT_TYPE_GENERIC_AFFINITY;
 508                 srat_proc[3].handler = acpi_parse_gi_affinity;
 509
 510                 acpi_table_parse_entries_array(ACPI_SIG_SRAT,
 511                                         sizeof(struct acpi_table_srat),
 512                                         srat_proc, ARRAY_SIZE(srat_proc), 0);
 513
 514                 cnt = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
 515                                             acpi_parse_memory_affinity, 0);
 516         }
 517
 518         /* SLIT: System Locality Information Table */
 519         acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit);
 520
 521         /*
 522          * CXL Fixed Memory Window Structures (CFMWS) must be parsed
 523          * after the SRAT. Create NUMA Nodes for CXL memory ranges that
 524          * are defined in the CFMWS and not already defined in the SRAT.
 525          * Initialize a fake_pxm as the first available PXM to emulate.
 526          */
 527
 528         /* fake_pxm is the next unused PXM value after SRAT parsing */
 529         for (i = 0, fake_pxm = -1; i < MAX_NUMNODES - 1; i++) {
 530                 if (node_to_pxm_map[i] > fake_pxm)
 531                         fake_pxm = node_to_pxm_map[i];
 532         }
 533         fake_pxm++;
 534         acpi_table_parse_cedt(ACPI_CEDT_TYPE_CFMWS, acpi_parse_cfmws,
 535                               &fake_pxm);
 536
 537         if (cnt < 0)
 538                 return cnt;
 539         else if (!parsed_numa_memblks)
 540                 return -ENOENT;
 541         return 0;
 542 }
 543
 544 static int acpi_get_pxm(acpi_handle h)
 545 {
 546         unsigned long long pxm;
 547         acpi_status status;
 548         acpi_handle handle;
 549         acpi_handle phandle = h;
 550
 551         do {
 552                 handle = phandle;
 553                 status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm);
 554                 if (ACPI_SUCCESS(status))
 555                         return pxm;
 556                 status = acpi_get_parent(handle, &phandle);
 557         } while (ACPI_SUCCESS(status));
 558         return -1;
 559 }
 560
 561 int acpi_get_node(acpi_handle handle)
 562 {
 563         int pxm;
 564
 565         pxm = acpi_get_pxm(handle);
 566
 567         return pxm_to_node(pxm);
 568 }
 569 EXPORT_SYMBOL(acpi_get_node);