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         if (pxm_to_node_map[pxm] == NUMA_NO_NODE || node < pxm_to_node_map[pxm])
  65                 pxm_to_node_map[pxm] = node;
  66         if (node_to_pxm_map[node] == PXM_INVAL || pxm < node_to_pxm_map[node])
  67                 node_to_pxm_map[node] = pxm;
  68 }
  69
  70 int acpi_map_pxm_to_node(int pxm)
  71 {
  72         int node = pxm_to_node_map[pxm];
  73
  74         if (node < 0) {
  75                 if (nodes_weight(nodes_found_map) >= MAX_NUMNODES)
  76                         return NUMA_NO_NODE;
  77                 node = first_unset_node(nodes_found_map);
  78                 __acpi_map_pxm_to_node(pxm, node);
  79                 node_set(node, nodes_found_map);
  80         }
  81
  82         return node;
  83 }
  84
  85 static void __init
  86 acpi_table_print_srat_entry(struct acpi_subtable_header *header)
  87 {
  88
  89         ACPI_FUNCTION_NAME("acpi_table_print_srat_entry");
  90
  91         if (!header)
  92                 return;
  93
  94         switch (header->type) {
  95
  96         case ACPI_SRAT_TYPE_CPU_AFFINITY:
  97 #ifdef ACPI_DEBUG_OUTPUT
  98                 {
  99                         struct acpi_srat_cpu_affinity *p =
 100                             (struct acpi_srat_cpu_affinity *)header;
 101                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 102                                           "SRAT Processor (id[0x%02x] eid[0x%02x]) in proximity domain %d %s\n",
 103                                           p->apic_id, p->local_sapic_eid,
 104                                           p->proximity_domain_lo,
 105                                           (p->flags & ACPI_SRAT_CPU_ENABLED)?
 106                                           "enabled" : "disabled"));
 107                 }
 108 #endif                          /* ACPI_DEBUG_OUTPUT */
 109                 break;
 110
 111         case ACPI_SRAT_TYPE_MEMORY_AFFINITY:
 112 #ifdef ACPI_DEBUG_OUTPUT
 113                 {
 114                         struct acpi_srat_mem_affinity *p =
 115                             (struct acpi_srat_mem_affinity *)header;
 116                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 117                                           "SRAT Memory (0x%lx length 0x%lx) in proximity domain %d %s%s\n",
 118                                           (unsigned long)p->base_address,
 119                                           (unsigned long)p->length,
 120                                           p->proximity_domain,
 121                                           (p->flags & ACPI_SRAT_MEM_ENABLED)?
 122                                           "enabled" : "disabled",
 123                                           (p->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE)?
 124                                           " hot-pluggable" : ""));
 125                 }
 126 #endif                          /* ACPI_DEBUG_OUTPUT */
 127                 break;
 128
 129         case ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY:
 130 #ifdef ACPI_DEBUG_OUTPUT
 131                 {
 132                         struct acpi_srat_x2apic_cpu_affinity *p =
 133                             (struct acpi_srat_x2apic_cpu_affinity *)header;
 134                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 135                                           "SRAT Processor (x2apicid[0x%08x]) in"
 136                                           " proximity domain %d %s\n",
 137                                           p->apic_id,
 138                                           p->proximity_domain,
 139                                           (p->flags & ACPI_SRAT_CPU_ENABLED) ?
 140                                           "enabled" : "disabled"));
 141                 }
 142 #endif                          /* ACPI_DEBUG_OUTPUT */
 143                 break;
 144         default:
 145                 printk(KERN_WARNING PREFIX
 146                        "Found unsupported SRAT entry (type = 0x%x)\n",
 147                        header->type);
 148                 break;
 149         }
 150 }
 151
 152 /*
 153  * A lot of BIOS fill in 10 (= no distance) everywhere. This messes
 154  * up the NUMA heuristics which wants the local node to have a smaller
 155  * distance than the others.
 156  * Do some quick checks here and only use the SLIT if it passes.
 157  */
 158 static __init int slit_valid(struct acpi_table_slit *slit)
 159 {
 160         int i, j;
 161         int d = slit->locality_count;
 162         for (i = 0; i < d; i++) {
 163                 for (j = 0; j < d; j++)  {
 164                         u8 val = slit->entry[d*i + j];
 165                         if (i == j) {
 166                                 if (val != LOCAL_DISTANCE)
 167                                         return 0;
 168                         } else if (val <= LOCAL_DISTANCE)
 169                                 return 0;
 170                 }
 171         }
 172         return 1;
 173 }
 174
 175 static int __init acpi_parse_slit(struct acpi_table_header *table)
 176 {
 177         struct acpi_table_slit *slit;
 178
 179         if (!table)
 180                 return -EINVAL;
 181
 182         slit = (struct acpi_table_slit *)table;
 183
 184         if (!slit_valid(slit)) {
 185                 printk(KERN_INFO "ACPI: SLIT table looks invalid. Not used.\n");
 186                 return -EINVAL;
 187         }
 188         acpi_numa_slit_init(slit);
 189
 190         return 0;
 191 }
 192
 193 void __init __attribute__ ((weak))
 194 acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
 195 {
 196         printk(KERN_WARNING PREFIX
 197                "Found unsupported x2apic [0x%08x] SRAT entry\n", pa->apic_id);
 198         return;
 199 }
 200
 201
 202 static int __init
 203 acpi_parse_x2apic_affinity(struct acpi_subtable_header *header,
 204                            const unsigned long end)
 205 {
 206         struct acpi_srat_x2apic_cpu_affinity *processor_affinity;
 207
 208         processor_affinity = (struct acpi_srat_x2apic_cpu_affinity *)header;
 209         if (!processor_affinity)
 210                 return -EINVAL;
 211
 212         acpi_table_print_srat_entry(header);
 213
 214         /* let architecture-dependent part to do it */
 215         acpi_numa_x2apic_affinity_init(processor_affinity);
 216
 217         return 0;
 218 }
 219
 220 static int __init
 221 acpi_parse_processor_affinity(struct acpi_subtable_header *header,
 222                               const unsigned long end)
 223 {
 224         struct acpi_srat_cpu_affinity *processor_affinity;
 225
 226         processor_affinity = (struct acpi_srat_cpu_affinity *)header;
 227         if (!processor_affinity)
 228                 return -EINVAL;
 229
 230         acpi_table_print_srat_entry(header);
 231
 232         /* let architecture-dependent part to do it */
 233         acpi_numa_processor_affinity_init(processor_affinity);
 234
 235         return 0;
 236 }
 237
 238 static int __init
 239 acpi_parse_memory_affinity(struct acpi_subtable_header * header,
 240                            const unsigned long end)
 241 {
 242         struct acpi_srat_mem_affinity *memory_affinity;
 243
 244         memory_affinity = (struct acpi_srat_mem_affinity *)header;
 245         if (!memory_affinity)
 246                 return -EINVAL;
 247
 248         acpi_table_print_srat_entry(header);
 249
 250         /* let architecture-dependent part to do it */
 251         acpi_numa_memory_affinity_init(memory_affinity);
 252
 253         return 0;
 254 }
 255
 256 static int __init acpi_parse_srat(struct acpi_table_header *table)
 257 {
 258         if (!table)
 259                 return -EINVAL;
 260
 261         /* Real work done in acpi_table_parse_srat below. */
 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_cpu_ids);
 283                 acpi_table_parse_srat(ACPI_SRAT_TYPE_CPU_AFFINITY,
 284                                      acpi_parse_processor_affinity, nr_cpu_ids);
 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);