drivers/acpi/numa.c

   1 /*
   2  *  acpi_numa.c - ACPI NUMA support
   3  *
   4  *  Copyright (C) 2002 Takayoshi Kochi <t-kochi@bq.jp.nec.com>
   5  *
   6  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  19  *
  20  */
  21
  22 #define pr_fmt(fmt) "ACPI: " fmt
  23
  24 #include <linux/module.h>
  25 #include <linux/init.h>
  26 #include <linux/kernel.h>
  27 #include <linux/types.h>
  28 #include <linux/errno.h>
  29 #include <linux/acpi.h>
  30 #include <linux/bootmem.h>
  31 #include <linux/memblock.h>
  32 #include <linux/numa.h>
  33 #include <linux/nodemask.h>
  34 #include <linux/topology.h>
  35
  36 static nodemask_t nodes_found_map = NODE_MASK_NONE;
  37
  38 /* maps to convert between proximity domain and logical node ID */
  39 static int pxm_to_node_map[MAX_PXM_DOMAINS]
  40                         = { [0 ... MAX_PXM_DOMAINS - 1] = NUMA_NO_NODE };
  41 static int node_to_pxm_map[MAX_NUMNODES]
  42                         = { [0 ... MAX_NUMNODES - 1] = PXM_INVAL };
  43
  44 unsigned char acpi_srat_revision __initdata;
  45 int acpi_numa __initdata;
  46
  47 int pxm_to_node(int pxm)
  48 {
  49         if (pxm < 0)
  50                 return NUMA_NO_NODE;
  51         return pxm_to_node_map[pxm];
  52 }
  53
  54 int node_to_pxm(int node)
  55 {
  56         if (node < 0)
  57                 return PXM_INVAL;
  58         return node_to_pxm_map[node];
  59 }
  60
  61 static void __acpi_map_pxm_to_node(int pxm, int node)
  62 {
  63         if (pxm_to_node_map[pxm] == NUMA_NO_NODE || node < pxm_to_node_map[pxm])
  64                 pxm_to_node_map[pxm] = node;
  65         if (node_to_pxm_map[node] == PXM_INVAL || pxm < node_to_pxm_map[node])
  66                 node_to_pxm_map[node] = pxm;
  67 }
  68
  69 int acpi_map_pxm_to_node(int pxm)
  70 {
  71         int node;
  72
  73         if (pxm < 0 || pxm >= MAX_PXM_DOMAINS || numa_off)
  74                 return NUMA_NO_NODE;
  75
  76         node = pxm_to_node_map[pxm];
  77
  78         if (node == NUMA_NO_NODE) {
  79                 if (nodes_weight(nodes_found_map) >= MAX_NUMNODES)
  80                         return NUMA_NO_NODE;
  81                 node = first_unset_node(nodes_found_map);
  82                 __acpi_map_pxm_to_node(pxm, node);
  83                 node_set(node, nodes_found_map);
  84         }
  85
  86         return node;
  87 }
  88
  89 /**
  90  * acpi_map_pxm_to_online_node - Map proximity ID to online node
  91  * @pxm: ACPI proximity ID
  92  *
  93  * This is similar to acpi_map_pxm_to_node(), but always returns an online
  94  * node.  When the mapped node from a given proximity ID is offline, it
  95  * looks up the node distance table and returns the nearest online node.
  96  *
  97  * ACPI device drivers, which are called after the NUMA initialization has
  98  * completed in the kernel, can call this interface to obtain their device
  99  * NUMA topology from ACPI tables.  Such drivers do not have to deal with
 100  * offline nodes.  A node may be offline when a device proximity ID is
 101  * unique, SRAT memory entry does not exist, or NUMA is disabled, ex.
 102  * "numa=off" on x86.
 103  */
 104 int acpi_map_pxm_to_online_node(int pxm)
 105 {
 106         int node, min_node;
 107
 108         node = acpi_map_pxm_to_node(pxm);
 109
 110         if (node == NUMA_NO_NODE)
 111                 node = 0;
 112
 113         min_node = node;
 114         if (!node_online(node)) {
 115                 int min_dist = INT_MAX, dist, n;
 116
 117                 for_each_online_node(n) {
 118                         dist = node_distance(node, n);
 119                         if (dist < min_dist) {
 120                                 min_dist = dist;
 121                                 min_node = n;
 122                         }
 123                 }
 124         }
 125
 126         return min_node;
 127 }
 128 EXPORT_SYMBOL(acpi_map_pxm_to_online_node);
 129
 130 static void __init
 131 acpi_table_print_srat_entry(struct acpi_subtable_header *header)
 132 {
 133         switch (header->type) {
 134         case ACPI_SRAT_TYPE_CPU_AFFINITY:
 135                 {
 136                         struct acpi_srat_cpu_affinity *p =
 137                             (struct acpi_srat_cpu_affinity *)header;
 138                         pr_debug("SRAT Processor (id[0x%02x] eid[0x%02x]) in proximity domain %d %s\n",
 139                                  p->apic_id, p->local_sapic_eid,
 140                                  p->proximity_domain_lo,
 141                                  (p->flags & ACPI_SRAT_CPU_ENABLED) ?
 142                                  "enabled" : "disabled");
 143                 }
 144                 break;
 145
 146         case ACPI_SRAT_TYPE_MEMORY_AFFINITY:
 147                 {
 148                         struct acpi_srat_mem_affinity *p =
 149                             (struct acpi_srat_mem_affinity *)header;
 150                         pr_debug("SRAT Memory (0x%lx length 0x%lx) in proximity domain %d %s%s%s\n",
 151                                  (unsigned long)p->base_address,
 152                                  (unsigned long)p->length,
 153                                  p->proximity_domain,
 154                                  (p->flags & ACPI_SRAT_MEM_ENABLED) ?
 155                                  "enabled" : "disabled",
 156                                  (p->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) ?
 157                                  " hot-pluggable" : "",
 158                                  (p->flags & ACPI_SRAT_MEM_NON_VOLATILE) ?
 159                                  " non-volatile" : "");
 160                 }
 161                 break;
 162
 163         case ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY:
 164                 {
 165                         struct acpi_srat_x2apic_cpu_affinity *p =
 166                             (struct acpi_srat_x2apic_cpu_affinity *)header;
 167                         pr_debug("SRAT Processor (x2apicid[0x%08x]) in proximity domain %d %s\n",
 168                                  p->apic_id,
 169                                  p->proximity_domain,
 170                                  (p->flags & ACPI_SRAT_CPU_ENABLED) ?
 171                                  "enabled" : "disabled");
 172                 }
 173                 break;
 174
 175         case ACPI_SRAT_TYPE_GICC_AFFINITY:
 176                 {
 177                         struct acpi_srat_gicc_affinity *p =
 178                             (struct acpi_srat_gicc_affinity *)header;
 179                         pr_debug("SRAT Processor (acpi id[0x%04x]) in proximity domain %d %s\n",
 180                                  p->acpi_processor_uid,
 181                                  p->proximity_domain,
 182                                  (p->flags & ACPI_SRAT_GICC_ENABLED) ?
 183                                  "enabled" : "disabled");
 184                 }
 185                 break;
 186
 187         default:
 188                 pr_warn("Found unsupported SRAT entry (type = 0x%x)\n",
 189                         header->type);
 190                 break;
 191         }
 192 }
 193
 194 /*
 195  * A lot of BIOS fill in 10 (= no distance) everywhere. This messes
 196  * up the NUMA heuristics which wants the local node to have a smaller
 197  * distance than the others.
 198  * Do some quick checks here and only use the SLIT if it passes.
 199  */
 200 static int __init slit_valid(struct acpi_table_slit *slit)
 201 {
 202         int i, j;
 203         int d = slit->locality_count;
 204         for (i = 0; i < d; i++) {
 205                 for (j = 0; j < d; j++)  {
 206                         u8 val = slit->entry[d*i + j];
 207                         if (i == j) {
 208                                 if (val != LOCAL_DISTANCE)
 209                                         return 0;
 210                         } else if (val <= LOCAL_DISTANCE)
 211                                 return 0;
 212                 }
 213         }
 214         return 1;
 215 }
 216
 217 void __init bad_srat(void)
 218 {
 219         pr_err("SRAT: SRAT not used.\n");
 220         acpi_numa = -1;
 221 }
 222
 223 int __init srat_disabled(void)
 224 {
 225         return acpi_numa < 0;
 226 }
 227
 228 #if defined(CONFIG_X86) || defined(CONFIG_ARM64)
 229 /*
 230  * Callback for SLIT parsing.  pxm_to_node() returns NUMA_NO_NODE for
 231  * I/O localities since SRAT does not list them.  I/O localities are
 232  * not supported at this point.
 233  */
 234 void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
 235 {
 236         int i, j;
 237
 238         for (i = 0; i < slit->locality_count; i++) {
 239                 const int from_node = pxm_to_node(i);
 240
 241                 if (from_node == NUMA_NO_NODE)
 242                         continue;
 243
 244                 for (j = 0; j < slit->locality_count; j++) {
 245                         const int to_node = pxm_to_node(j);
 246
 247                         if (to_node == NUMA_NO_NODE)
 248                                 continue;
 249
 250                         numa_set_distance(from_node, to_node,
 251                                 slit->entry[slit->locality_count * i + j]);
 252                 }
 253         }
 254 }
 255
 256 /*
 257  * Default callback for parsing of the Proximity Domain <-> Memory
 258  * Area mappings
 259  */
 260 int __init
 261 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
 262 {
 263         u64 start, end;
 264         u32 hotpluggable;
 265         int node, pxm;
 266
 267         if (srat_disabled())
 268                 goto out_err;
 269         if (ma->header.length < sizeof(struct acpi_srat_mem_affinity)) {
 270                 pr_err("SRAT: Unexpected header length: %d\n",
 271                        ma->header.length);
 272                 goto out_err_bad_srat;
 273         }
 274         if ((ma->flags & ACPI_SRAT_MEM_ENABLED) == 0)
 275                 goto out_err;
 276         hotpluggable = ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE;
 277         if (hotpluggable && !IS_ENABLED(CONFIG_MEMORY_HOTPLUG))
 278                 goto out_err;
 279
 280         start = ma->base_address;
 281         end = start + ma->length;
 282         pxm = ma->proximity_domain;
 283         if (acpi_srat_revision <= 1)
 284                 pxm &= 0xff;
 285
 286         node = acpi_map_pxm_to_node(pxm);
 287         if (node == NUMA_NO_NODE || node >= MAX_NUMNODES) {
 288                 pr_err("SRAT: Too many proximity domains.\n");
 289                 goto out_err_bad_srat;
 290         }
 291
 292         if (numa_add_memblk(node, start, end) < 0) {
 293                 pr_err("SRAT: Failed to add memblk to node %u [mem %#010Lx-%#010Lx]\n",
 294                        node, (unsigned long long) start,
 295                        (unsigned long long) end - 1);
 296                 goto out_err_bad_srat;
 297         }
 298
 299         node_set(node, numa_nodes_parsed);
 300
 301         pr_info("SRAT: Node %u PXM %u [mem %#010Lx-%#010Lx]%s%s\n",
 302                 node, pxm,
 303                 (unsigned long long) start, (unsigned long long) end - 1,
 304                 hotpluggable ? " hotplug" : "",
 305                 ma->flags & ACPI_SRAT_MEM_NON_VOLATILE ? " non-volatile" : "");
 306
 307         /* Mark hotplug range in memblock. */
 308         if (hotpluggable && memblock_mark_hotplug(start, ma->length))
 309                 pr_warn("SRAT: Failed to mark hotplug range [mem %#010Lx-%#010Lx] in memblock\n",
 310                         (unsigned long long)start, (unsigned long long)end - 1);
 311
 312         max_possible_pfn = max(max_possible_pfn, PFN_UP(end - 1));
 313
 314         return 0;
 315 out_err_bad_srat:
 316         bad_srat();
 317 out_err:
 318         return -EINVAL;
 319 }
 320 #endif /* defined(CONFIG_X86) || defined (CONFIG_ARM64) */
 321
 322 static int __init acpi_parse_slit(struct acpi_table_header *table)
 323 {
 324         struct acpi_table_slit *slit = (struct acpi_table_slit *)table;
 325
 326         if (!slit_valid(slit)) {
 327                 pr_info("SLIT table looks invalid. Not used.\n");
 328                 return -EINVAL;
 329         }
 330         acpi_numa_slit_init(slit);
 331
 332         return 0;
 333 }
 334
 335 void __init __weak
 336 acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
 337 {
 338         pr_warn("Found unsupported x2apic [0x%08x] SRAT entry\n", pa->apic_id);
 339 }
 340
 341 static int __init
 342 acpi_parse_x2apic_affinity(struct acpi_subtable_header *header,
 343                            const unsigned long end)
 344 {
 345         struct acpi_srat_x2apic_cpu_affinity *processor_affinity;
 346
 347         processor_affinity = (struct acpi_srat_x2apic_cpu_affinity *)header;
 348         if (!processor_affinity)
 349                 return -EINVAL;
 350
 351         acpi_table_print_srat_entry(header);
 352
 353         /* let architecture-dependent part to do it */
 354         acpi_numa_x2apic_affinity_init(processor_affinity);
 355
 356         return 0;
 357 }
 358
 359 static int __init
 360 acpi_parse_processor_affinity(struct acpi_subtable_header *header,
 361                               const unsigned long end)
 362 {
 363         struct acpi_srat_cpu_affinity *processor_affinity;
 364
 365         processor_affinity = (struct acpi_srat_cpu_affinity *)header;
 366         if (!processor_affinity)
 367                 return -EINVAL;
 368
 369         acpi_table_print_srat_entry(header);
 370
 371         /* let architecture-dependent part to do it */
 372         acpi_numa_processor_affinity_init(processor_affinity);
 373
 374         return 0;
 375 }
 376
 377 static int __init
 378 acpi_parse_gicc_affinity(struct acpi_subtable_header *header,
 379                          const unsigned long end)
 380 {
 381         struct acpi_srat_gicc_affinity *processor_affinity;
 382
 383         processor_affinity = (struct acpi_srat_gicc_affinity *)header;
 384         if (!processor_affinity)
 385                 return -EINVAL;
 386
 387         acpi_table_print_srat_entry(header);
 388
 389         /* let architecture-dependent part to do it */
 390         acpi_numa_gicc_affinity_init(processor_affinity);
 391
 392         return 0;
 393 }
 394
 395 static int __initdata parsed_numa_memblks;
 396
 397 static int __init
 398 acpi_parse_memory_affinity(struct acpi_subtable_header * header,
 399                            const unsigned long end)
 400 {
 401         struct acpi_srat_mem_affinity *memory_affinity;
 402
 403         memory_affinity = (struct acpi_srat_mem_affinity *)header;
 404         if (!memory_affinity)
 405                 return -EINVAL;
 406
 407         acpi_table_print_srat_entry(header);
 408
 409         /* let architecture-dependent part to do it */
 410         if (!acpi_numa_memory_affinity_init(memory_affinity))
 411                 parsed_numa_memblks++;
 412         return 0;
 413 }
 414
 415 static int __init acpi_parse_srat(struct acpi_table_header *table)
 416 {
 417         struct acpi_table_srat *srat = (struct acpi_table_srat *)table;
 418
 419         acpi_srat_revision = srat->header.revision;
 420
 421         /* Real work done in acpi_table_parse_srat below. */
 422
 423         return 0;
 424 }
 425
 426 static int __init
 427 acpi_table_parse_srat(enum acpi_srat_type id,
 428                       acpi_tbl_entry_handler handler, unsigned int max_entries)
 429 {
 430         return acpi_table_parse_entries(ACPI_SIG_SRAT,
 431                                             sizeof(struct acpi_table_srat), id,
 432                                             handler, max_entries);
 433 }
 434
 435 int __init acpi_numa_init(void)
 436 {
 437         int cnt = 0;
 438
 439         if (acpi_disabled)
 440                 return -EINVAL;
 441
 442         /*
 443          * Should not limit number with cpu num that is from NR_CPUS or nr_cpus=
 444          * SRAT cpu entries could have different order with that in MADT.
 445          * So go over all cpu entries in SRAT to get apicid to node mapping.
 446          */
 447
 448         /* SRAT: System Resource Affinity Table */
 449         if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) {
 450                 struct acpi_subtable_proc srat_proc[3];
 451
 452                 memset(srat_proc, 0, sizeof(srat_proc));
 453                 srat_proc[0].id = ACPI_SRAT_TYPE_CPU_AFFINITY;
 454                 srat_proc[0].handler = acpi_parse_processor_affinity;
 455                 srat_proc[1].id = ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY;
 456                 srat_proc[1].handler = acpi_parse_x2apic_affinity;
 457                 srat_proc[2].id = ACPI_SRAT_TYPE_GICC_AFFINITY;
 458                 srat_proc[2].handler = acpi_parse_gicc_affinity;
 459
 460                 acpi_table_parse_entries_array(ACPI_SIG_SRAT,
 461                                         sizeof(struct acpi_table_srat),
 462                                         srat_proc, ARRAY_SIZE(srat_proc), 0);
 463
 464                 cnt = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
 465                                             acpi_parse_memory_affinity,
 466                                             NR_NODE_MEMBLKS);
 467         }
 468
 469         /* SLIT: System Locality Information Table */
 470         acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit);
 471
 472         if (cnt < 0)
 473                 return cnt;
 474         else if (!parsed_numa_memblks)
 475                 return -ENOENT;
 476         return 0;
 477 }
 478
 479 static int acpi_get_pxm(acpi_handle h)
 480 {
 481         unsigned long long pxm;
 482         acpi_status status;
 483         acpi_handle handle;
 484         acpi_handle phandle = h;
 485
 486         do {
 487                 handle = phandle;
 488                 status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm);
 489                 if (ACPI_SUCCESS(status))
 490                         return pxm;
 491                 status = acpi_get_parent(handle, &phandle);
 492         } while (ACPI_SUCCESS(status));
 493         return -1;
 494 }
 495
 496 int acpi_get_node(acpi_handle handle)
 497 {
 498         int pxm;
 499
 500         pxm = acpi_get_pxm(handle);
 501
 502         return acpi_map_pxm_to_node(pxm);
 503 }
 504 EXPORT_SYMBOL(acpi_get_node);