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