kernel/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 #include <linux/module.h>
  22 #include <linux/init.h>
  23 #include <linux/kernel.h>
  24 #include <linux/types.h>
  25 #include <linux/errno.h>
  26 #include <linux/acpi.h>
  27 #include <linux/numa.h>
  28 #include <linux/nodemask.h>
  29 #include <linux/topology.h>
  30
  31 #define PREFIX "ACPI: "
  32
  33 #define ACPI_NUMA       0x80000000
  34 #define _COMPONENT      ACPI_NUMA
  35 ACPI_MODULE_NAME("numa");
  36
  37 static nodemask_t nodes_found_map = NODE_MASK_NONE;
  38
  39 /* maps to convert between proximity domain and logical node ID */
  40 static int pxm_to_node_map[MAX_PXM_DOMAINS]
  41                         = { [0 ... MAX_PXM_DOMAINS - 1] = NUMA_NO_NODE };
  42 static int node_to_pxm_map[MAX_NUMNODES]
  43                         = { [0 ... MAX_NUMNODES - 1] = PXM_INVAL };
  44
  45 unsigned char acpi_srat_revision __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)
  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, n, dist, min_dist;
 107
 108         node = acpi_map_pxm_to_node(pxm);
 109
 110         if (node == NUMA_NO_NODE)
 111                 node = 0;
 112
 113         if (!node_online(node)) {
 114                 min_dist = INT_MAX;
 115                 for_each_online_node(n) {
 116                         dist = node_distance(node, n);
 117                         if (dist < min_dist) {
 118                                 min_dist = dist;
 119                                 node = n;
 120                         }
 121                 }
 122         }
 123
 124         return node;
 125 }
 126 EXPORT_SYMBOL(acpi_map_pxm_to_online_node);
 127
 128 static void __init
 129 acpi_table_print_srat_entry(struct acpi_subtable_header *header)
 130 {
 131
 132         ACPI_FUNCTION_NAME("acpi_table_print_srat_entry");
 133
 134         if (!header)
 135                 return;
 136
 137         switch (header->type) {
 138
 139         case ACPI_SRAT_TYPE_CPU_AFFINITY:
 140 #ifdef ACPI_DEBUG_OUTPUT
 141                 {
 142                         struct acpi_srat_cpu_affinity *p =
 143                             (struct acpi_srat_cpu_affinity *)header;
 144                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 145                                           "SRAT Processor (id[0x%02x] eid[0x%02x]) in proximity domain %d %s\n",
 146                                           p->apic_id, p->local_sapic_eid,
 147                                           p->proximity_domain_lo,
 148                                           (p->flags & ACPI_SRAT_CPU_ENABLED)?
 149                                           "enabled" : "disabled"));
 150                 }
 151 #endif                          /* ACPI_DEBUG_OUTPUT */
 152                 break;
 153
 154         case ACPI_SRAT_TYPE_MEMORY_AFFINITY:
 155 #ifdef ACPI_DEBUG_OUTPUT
 156                 {
 157                         struct acpi_srat_mem_affinity *p =
 158                             (struct acpi_srat_mem_affinity *)header;
 159                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 160                                           "SRAT Memory (0x%lx length 0x%lx) in proximity domain %d %s%s%s\n",
 161                                           (unsigned long)p->base_address,
 162                                           (unsigned long)p->length,
 163                                           p->proximity_domain,
 164                                           (p->flags & ACPI_SRAT_MEM_ENABLED)?
 165                                           "enabled" : "disabled",
 166                                           (p->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE)?
 167                                           " hot-pluggable" : "",
 168                                           (p->flags & ACPI_SRAT_MEM_NON_VOLATILE)?
 169                                           " non-volatile" : ""));
 170                 }
 171 #endif                          /* ACPI_DEBUG_OUTPUT */
 172                 break;
 173
 174         case ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY:
 175 #ifdef ACPI_DEBUG_OUTPUT
 176                 {
 177                         struct acpi_srat_x2apic_cpu_affinity *p =
 178                             (struct acpi_srat_x2apic_cpu_affinity *)header;
 179                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 180                                           "SRAT Processor (x2apicid[0x%08x]) in"
 181                                           " proximity domain %d %s\n",
 182                                           p->apic_id,
 183                                           p->proximity_domain,
 184                                           (p->flags & ACPI_SRAT_CPU_ENABLED) ?
 185                                           "enabled" : "disabled"));
 186                 }
 187 #endif                          /* ACPI_DEBUG_OUTPUT */
 188                 break;
 189         default:
 190                 printk(KERN_WARNING PREFIX
 191                        "Found unsupported SRAT entry (type = 0x%x)\n",
 192                        header->type);
 193                 break;
 194         }
 195 }
 196
 197 /*
 198  * A lot of BIOS fill in 10 (= no distance) everywhere. This messes
 199  * up the NUMA heuristics which wants the local node to have a smaller
 200  * distance than the others.
 201  * Do some quick checks here and only use the SLIT if it passes.
 202  */
 203 static int __init slit_valid(struct acpi_table_slit *slit)
 204 {
 205         int i, j;
 206         int d = slit->locality_count;
 207         for (i = 0; i < d; i++) {
 208                 for (j = 0; j < d; j++)  {
 209                         u8 val = slit->entry[d*i + j];
 210                         if (i == j) {
 211                                 if (val != LOCAL_DISTANCE)
 212                                         return 0;
 213                         } else if (val <= LOCAL_DISTANCE)
 214                                 return 0;
 215                 }
 216         }
 217         return 1;
 218 }
 219
 220 static int __init acpi_parse_slit(struct acpi_table_header *table)
 221 {
 222         struct acpi_table_slit *slit = (struct acpi_table_slit *)table;
 223
 224         if (!slit_valid(slit)) {
 225                 printk(KERN_INFO "ACPI: SLIT table looks invalid. Not used.\n");
 226                 return -EINVAL;
 227         }
 228         acpi_numa_slit_init(slit);
 229
 230         return 0;
 231 }
 232
 233 void __init __weak
 234 acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
 235 {
 236         printk(KERN_WARNING PREFIX
 237                "Found unsupported x2apic [0x%08x] SRAT entry\n", pa->apic_id);
 238         return;
 239 }
 240
 241
 242 static int __init
 243 acpi_parse_x2apic_affinity(struct acpi_subtable_header *header,
 244                            const unsigned long end)
 245 {
 246         struct acpi_srat_x2apic_cpu_affinity *processor_affinity;
 247
 248         processor_affinity = (struct acpi_srat_x2apic_cpu_affinity *)header;
 249         if (!processor_affinity)
 250                 return -EINVAL;
 251
 252         acpi_table_print_srat_entry(header);
 253
 254         /* let architecture-dependent part to do it */
 255         acpi_numa_x2apic_affinity_init(processor_affinity);
 256
 257         return 0;
 258 }
 259
 260 static int __init
 261 acpi_parse_processor_affinity(struct acpi_subtable_header *header,
 262                               const unsigned long end)
 263 {
 264         struct acpi_srat_cpu_affinity *processor_affinity;
 265
 266         processor_affinity = (struct acpi_srat_cpu_affinity *)header;
 267         if (!processor_affinity)
 268                 return -EINVAL;
 269
 270         acpi_table_print_srat_entry(header);
 271
 272         /* let architecture-dependent part to do it */
 273         acpi_numa_processor_affinity_init(processor_affinity);
 274
 275         return 0;
 276 }
 277
 278 static int __initdata parsed_numa_memblks;
 279
 280 static int __init
 281 acpi_parse_memory_affinity(struct acpi_subtable_header * header,
 282                            const unsigned long end)
 283 {
 284         struct acpi_srat_mem_affinity *memory_affinity;
 285
 286         memory_affinity = (struct acpi_srat_mem_affinity *)header;
 287         if (!memory_affinity)
 288                 return -EINVAL;
 289
 290         acpi_table_print_srat_entry(header);
 291
 292         /* let architecture-dependent part to do it */
 293         if (!acpi_numa_memory_affinity_init(memory_affinity))
 294                 parsed_numa_memblks++;
 295         return 0;
 296 }
 297
 298 static int __init acpi_parse_srat(struct acpi_table_header *table)
 299 {
 300         struct acpi_table_srat *srat = (struct acpi_table_srat *)table;
 301
 302         acpi_srat_revision = srat->header.revision;
 303
 304         /* Real work done in acpi_table_parse_srat below. */
 305
 306         return 0;
 307 }
 308
 309 static int __init
 310 acpi_table_parse_srat(enum acpi_srat_type id,
 311                       acpi_tbl_entry_handler handler, unsigned int max_entries)
 312 {
 313         return acpi_table_parse_entries(ACPI_SIG_SRAT,
 314                                             sizeof(struct acpi_table_srat), id,
 315                                             handler, max_entries);
 316 }
 317
 318 int __init acpi_numa_init(void)
 319 {
 320         int cnt = 0;
 321
 322         /*
 323          * Should not limit number with cpu num that is from NR_CPUS or nr_cpus=
 324          * SRAT cpu entries could have different order with that in MADT.
 325          * So go over all cpu entries in SRAT to get apicid to node mapping.
 326          */
 327
 328         /* SRAT: Static Resource Affinity Table */
 329         if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) {
 330                 acpi_table_parse_srat(ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY,
 331                                      acpi_parse_x2apic_affinity, 0);
 332                 acpi_table_parse_srat(ACPI_SRAT_TYPE_CPU_AFFINITY,
 333                                      acpi_parse_processor_affinity, 0);
 334                 cnt = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
 335                                             acpi_parse_memory_affinity,
 336                                             NR_NODE_MEMBLKS);
 337         }
 338
 339         /* SLIT: System Locality Information Table */
 340         acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit);
 341
 342         acpi_numa_arch_fixup();
 343
 344         if (cnt < 0)
 345                 return cnt;
 346         else if (!parsed_numa_memblks)
 347                 return -ENOENT;
 348         return 0;
 349 }
 350
 351 static int acpi_get_pxm(acpi_handle h)
 352 {
 353         unsigned long long pxm;
 354         acpi_status status;
 355         acpi_handle handle;
 356         acpi_handle phandle = h;
 357
 358         do {
 359                 handle = phandle;
 360                 status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm);
 361                 if (ACPI_SUCCESS(status))
 362                         return pxm;
 363                 status = acpi_get_parent(handle, &phandle);
 364         } while (ACPI_SUCCESS(status));
 365         return -1;
 366 }
 367
 368 int acpi_get_node(acpi_handle handle)
 369 {
 370         int pxm;
 371
 372         pxm = acpi_get_pxm(handle);
 373
 374         return acpi_map_pxm_to_node(pxm);
 375 }
 376 EXPORT_SYMBOL(acpi_get_node);