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  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  *
  22  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  23  *
  24  */
  25 #include <linux/module.h>
  26 #include <linux/init.h>
  27 #include <linux/kernel.h>
  28 #include <linux/types.h>
  29 #include <linux/errno.h>
  30 #include <linux/acpi.h>
  31 #include <linux/numa.h>
  32 #include <acpi/acpi_bus.h>
  33
  34 #define PREFIX "ACPI: "
  35
  36 #define ACPI_NUMA       0x80000000
  37 #define _COMPONENT      ACPI_NUMA
  38 ACPI_MODULE_NAME("numa");
  39
  40 static nodemask_t nodes_found_map = NODE_MASK_NONE;
  41
  42 /* maps to convert between proximity domain and logical node ID */
  43 static int pxm_to_node_map[MAX_PXM_DOMAINS]
  44                         = { [0 ... MAX_PXM_DOMAINS - 1] = NUMA_NO_NODE };
  45 static int node_to_pxm_map[MAX_NUMNODES]
  46                         = { [0 ... MAX_NUMNODES - 1] = PXM_INVAL };
  47
  48 int pxm_to_node(int pxm)
  49 {
  50         if (pxm < 0)
  51                 return NUMA_NO_NODE;
  52         return pxm_to_node_map[pxm];
  53 }
  54
  55 int node_to_pxm(int node)
  56 {
  57         if (node < 0)
  58                 return PXM_INVAL;
  59         return node_to_pxm_map[node];
  60 }
  61
  62 void __acpi_map_pxm_to_node(int pxm, int node)
  63 {
  64         pxm_to_node_map[pxm] = node;
  65         node_to_pxm_map[node] = pxm;
  66 }
  67
  68 int acpi_map_pxm_to_node(int pxm)
  69 {
  70         int node = pxm_to_node_map[pxm];
  71
  72         if (node < 0) {
  73                 if (nodes_weight(nodes_found_map) >= MAX_NUMNODES)
  74                         return NUMA_NO_NODE;
  75                 node = first_unset_node(nodes_found_map);
  76                 __acpi_map_pxm_to_node(pxm, node);
  77                 node_set(node, nodes_found_map);
  78         }
  79
  80         return node;
  81 }
  82
  83 static void __init
  84 acpi_table_print_srat_entry(struct acpi_subtable_header *header)
  85 {
  86
  87         ACPI_FUNCTION_NAME("acpi_table_print_srat_entry");
  88
  89         if (!header)
  90                 return;
  91
  92         switch (header->type) {
  93
  94         case ACPI_SRAT_TYPE_CPU_AFFINITY:
  95 #ifdef ACPI_DEBUG_OUTPUT
  96                 {
  97                         struct acpi_srat_cpu_affinity *p =
  98                             (struct acpi_srat_cpu_affinity *)header;
  99                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 100                                           "SRAT Processor (id[0x%02x] eid[0x%02x]) in proximity domain %d %s\n",
 101                                           p->apic_id, p->local_sapic_eid,
 102                                           p->proximity_domain_lo,
 103                                           (p->flags & ACPI_SRAT_CPU_ENABLED)?
 104                                           "enabled" : "disabled"));
 105                 }
 106 #endif                          /* ACPI_DEBUG_OUTPUT */
 107                 break;
 108
 109         case ACPI_SRAT_TYPE_MEMORY_AFFINITY:
 110 #ifdef ACPI_DEBUG_OUTPUT
 111                 {
 112                         struct acpi_srat_mem_affinity *p =
 113                             (struct acpi_srat_mem_affinity *)header;
 114                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 115                                           "SRAT Memory (0x%lx length 0x%lx) in proximity domain %d %s%s\n",
 116                                           (unsigned long)p->base_address,
 117                                           (unsigned long)p->length,
 118                                           p->proximity_domain,
 119                                           (p->flags & ACPI_SRAT_MEM_ENABLED)?
 120                                           "enabled" : "disabled",
 121                                           (p->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE)?
 122                                           " hot-pluggable" : ""));
 123                 }
 124 #endif                          /* ACPI_DEBUG_OUTPUT */
 125                 break;
 126
 127         case ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY:
 128 #ifdef ACPI_DEBUG_OUTPUT
 129                 {
 130                         struct acpi_srat_x2apic_cpu_affinity *p =
 131                             (struct acpi_srat_x2apic_cpu_affinity *)header;
 132                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 133                                           "SRAT Processor (x2apicid[0x%08x]) in"
 134                                           " proximity domain %d %s\n",
 135                                           p->apic_id,
 136                                           p->proximity_domain,
 137                                           (p->flags & ACPI_SRAT_CPU_ENABLED) ?
 138                                           "enabled" : "disabled"));
 139                 }
 140 #endif                          /* ACPI_DEBUG_OUTPUT */
 141                 break;
 142         default:
 143                 printk(KERN_WARNING PREFIX
 144                        "Found unsupported SRAT entry (type = 0x%x)\n",
 145                        header->type);
 146                 break;
 147         }
 148 }
 149
 150 /*
 151  * A lot of BIOS fill in 10 (= no distance) everywhere. This messes
 152  * up the NUMA heuristics which wants the local node to have a smaller
 153  * distance than the others.
 154  * Do some quick checks here and only use the SLIT if it passes.
 155  */
 156 static __init int slit_valid(struct acpi_table_slit *slit)
 157 {
 158         int i, j;
 159         int d = slit->locality_count;
 160         for (i = 0; i < d; i++) {
 161                 for (j = 0; j < d; j++)  {
 162                         u8 val = slit->entry[d*i + j];
 163                         if (i == j) {
 164                                 if (val != LOCAL_DISTANCE)
 165                                         return 0;
 166                         } else if (val <= LOCAL_DISTANCE)
 167                                 return 0;
 168                 }
 169         }
 170         return 1;
 171 }
 172
 173 static int __init acpi_parse_slit(struct acpi_table_header *table)
 174 {
 175         struct acpi_table_slit *slit;
 176
 177         if (!table)
 178                 return -EINVAL;
 179
 180         slit = (struct acpi_table_slit *)table;
 181
 182         if (!slit_valid(slit)) {
 183                 printk(KERN_INFO "ACPI: SLIT table looks invalid. Not used.\n");
 184                 return -EINVAL;
 185         }
 186         acpi_numa_slit_init(slit);
 187
 188         return 0;
 189 }
 190
 191 void __init __attribute__ ((weak))
 192 acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
 193 {
 194         printk(KERN_WARNING PREFIX
 195                "Found unsupported x2apic [0x%08x] SRAT entry\n", pa->apic_id);
 196         return;
 197 }
 198
 199
 200 static int __init
 201 acpi_parse_x2apic_affinity(struct acpi_subtable_header *header,
 202                            const unsigned long end)
 203 {
 204         struct acpi_srat_x2apic_cpu_affinity *processor_affinity;
 205
 206         processor_affinity = (struct acpi_srat_x2apic_cpu_affinity *)header;
 207         if (!processor_affinity)
 208                 return -EINVAL;
 209
 210         acpi_table_print_srat_entry(header);
 211
 212         /* let architecture-dependent part to do it */
 213         acpi_numa_x2apic_affinity_init(processor_affinity);
 214
 215         return 0;
 216 }
 217
 218 static int __init
 219 acpi_parse_processor_affinity(struct acpi_subtable_header *header,
 220                               const unsigned long end)
 221 {
 222         struct acpi_srat_cpu_affinity *processor_affinity;
 223
 224         processor_affinity = (struct acpi_srat_cpu_affinity *)header;
 225         if (!processor_affinity)
 226                 return -EINVAL;
 227
 228         acpi_table_print_srat_entry(header);
 229
 230         /* let architecture-dependent part to do it */
 231         acpi_numa_processor_affinity_init(processor_affinity);
 232
 233         return 0;
 234 }
 235
 236 static int __init
 237 acpi_parse_memory_affinity(struct acpi_subtable_header * header,
 238                            const unsigned long end)
 239 {
 240         struct acpi_srat_mem_affinity *memory_affinity;
 241
 242         memory_affinity = (struct acpi_srat_mem_affinity *)header;
 243         if (!memory_affinity)
 244                 return -EINVAL;
 245
 246         acpi_table_print_srat_entry(header);
 247
 248         /* let architecture-dependent part to do it */
 249         acpi_numa_memory_affinity_init(memory_affinity);
 250
 251         return 0;
 252 }
 253
 254 static int __init acpi_parse_srat(struct acpi_table_header *table)
 255 {
 256         struct acpi_table_srat *srat;
 257
 258         if (!table)
 259                 return -EINVAL;
 260
 261         srat = (struct acpi_table_srat *)table;
 262
 263         return 0;
 264 }
 265
 266 static int __init
 267 acpi_table_parse_srat(enum acpi_srat_type id,
 268                       acpi_table_entry_handler handler, unsigned int max_entries)
 269 {
 270         return acpi_table_parse_entries(ACPI_SIG_SRAT,
 271                                             sizeof(struct acpi_table_srat), id,
 272                                             handler, max_entries);
 273 }
 274
 275 int __init acpi_numa_init(void)
 276 {
 277         int ret = 0;
 278
 279         /* SRAT: Static Resource Affinity Table */
 280         if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) {
 281                 acpi_table_parse_srat(ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY,
 282                                       acpi_parse_x2apic_affinity, NR_CPUS);
 283                 acpi_table_parse_srat(ACPI_SRAT_TYPE_CPU_AFFINITY,
 284                                       acpi_parse_processor_affinity, NR_CPUS);
 285                 ret = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
 286                                             acpi_parse_memory_affinity,
 287                                             NR_NODE_MEMBLKS);
 288         }
 289
 290         /* SLIT: System Locality Information Table */
 291         acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit);
 292
 293         acpi_numa_arch_fixup();
 294         return ret;
 295 }
 296
 297 int acpi_get_pxm(acpi_handle h)
 298 {
 299         unsigned long long pxm;
 300         acpi_status status;
 301         acpi_handle handle;
 302         acpi_handle phandle = h;
 303
 304         do {
 305                 handle = phandle;
 306                 status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm);
 307                 if (ACPI_SUCCESS(status))
 308                         return pxm;
 309                 status = acpi_get_parent(handle, &phandle);
 310         } while (ACPI_SUCCESS(status));
 311         return -1;
 312 }
 313
 314 int acpi_get_node(acpi_handle *handle)
 315 {
 316         int pxm, node = -1;
 317
 318         pxm = acpi_get_pxm(handle);
 319         if (pxm >= 0 && pxm < MAX_PXM_DOMAINS)
 320                 node = acpi_map_pxm_to_node(pxm);
 321
 322         return node;
 323 }
 324 EXPORT_SYMBOL(acpi_get_node);