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 <acpi/acpi_bus.h>
  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] = NID_INVAL };
  42 static int node_to_pxm_map[MAX_NUMNODES]
  43                                 = { [0 ... MAX_NUMNODES - 1] = PXM_INVAL };
  44
  45 int pxm_to_node(int pxm)
  46 {
  47         if (pxm < 0)
  48                 return NID_INVAL;
  49         return pxm_to_node_map[pxm];
  50 }
  51
  52 int node_to_pxm(int node)
  53 {
  54         if (node < 0)
  55                 return PXM_INVAL;
  56         return node_to_pxm_map[node];
  57 }
  58
  59 void __acpi_map_pxm_to_node(int pxm, int node)
  60 {
  61         pxm_to_node_map[pxm] = node;
  62         node_to_pxm_map[node] = pxm;
  63 }
  64
  65 int acpi_map_pxm_to_node(int pxm)
  66 {
  67         int node = pxm_to_node_map[pxm];
  68
  69         if (node < 0){
  70                 if (nodes_weight(nodes_found_map) >= MAX_NUMNODES)
  71                         return NID_INVAL;
  72                 node = first_unset_node(nodes_found_map);
  73                 __acpi_map_pxm_to_node(pxm, node);
  74                 node_set(node, nodes_found_map);
  75         }
  76
  77         return node;
  78 }
  79
  80 #if 0
  81 void __cpuinit acpi_unmap_pxm_to_node(int node)
  82 {
  83         int pxm = node_to_pxm_map[node];
  84         pxm_to_node_map[pxm] = NID_INVAL;
  85         node_to_pxm_map[node] = PXM_INVAL;
  86         node_clear(node, nodes_found_map);
  87 }
  88 #endif  /*  0  */
  89
  90 static void __init
  91 acpi_table_print_srat_entry(struct acpi_subtable_header *header)
  92 {
  93
  94         ACPI_FUNCTION_NAME("acpi_table_print_srat_entry");
  95
  96         if (!header)
  97                 return;
  98
  99         switch (header->type) {
 100
 101         case ACPI_SRAT_TYPE_CPU_AFFINITY:
 102 #ifdef ACPI_DEBUG_OUTPUT
 103                 {
 104                         struct acpi_srat_cpu_affinity *p =
 105                             (struct acpi_srat_cpu_affinity *)header;
 106                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 107                                           "SRAT Processor (id[0x%02x] eid[0x%02x]) in proximity domain %d %s\n",
 108                                           p->apic_id, p->local_sapic_eid,
 109                                           p->proximity_domain_lo,
 110                                           (p->flags & ACPI_SRAT_CPU_ENABLED)?
 111                                           "enabled" : "disabled"));
 112                 }
 113 #endif                          /* ACPI_DEBUG_OUTPUT */
 114                 break;
 115
 116         case ACPI_SRAT_TYPE_MEMORY_AFFINITY:
 117 #ifdef ACPI_DEBUG_OUTPUT
 118                 {
 119                         struct acpi_srat_mem_affinity *p =
 120                             (struct acpi_srat_mem_affinity *)header;
 121                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 122                                           "SRAT Memory (0x%lx length 0x%lx) in proximity domain %d %s%s\n",
 123                                           (unsigned long)p->base_address,
 124                                           (unsigned long)p->length,
 125                                           p->proximity_domain,
 126                                           (p->flags & ACPI_SRAT_MEM_ENABLED)?
 127                                           "enabled" : "disabled",
 128                                           (p->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE)?
 129                                           " hot-pluggable" : ""));
 130                 }
 131 #endif                          /* ACPI_DEBUG_OUTPUT */
 132                 break;
 133
 134         case ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY:
 135 #ifdef ACPI_DEBUG_OUTPUT
 136                 {
 137                         struct acpi_srat_x2apic_cpu_affinity *p =
 138                             (struct acpi_srat_x2apic_cpu_affinity *)header;
 139                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 140                                           "SRAT Processor (x2apicid[0x%08x]) in"
 141                                           " proximity domain %d %s\n",
 142                                           p->apic_id,
 143                                           p->proximity_domain,
 144                                           (p->flags & ACPI_SRAT_CPU_ENABLED) ?
 145                                           "enabled" : "disabled"));
 146                 }
 147 #endif                          /* ACPI_DEBUG_OUTPUT */
 148                 break;
 149         default:
 150                 printk(KERN_WARNING PREFIX
 151                        "Found unsupported SRAT entry (type = 0x%x)\n",
 152                        header->type);
 153                 break;
 154         }
 155 }
 156
 157 /*
 158  * A lot of BIOS fill in 10 (= no distance) everywhere. This messes
 159  * up the NUMA heuristics which wants the local node to have a smaller
 160  * distance than the others.
 161  * Do some quick checks here and only use the SLIT if it passes.
 162  */
 163 static __init int slit_valid(struct acpi_table_slit *slit)
 164 {
 165         int i, j;
 166         int d = slit->locality_count;
 167         for (i = 0; i < d; i++) {
 168                 for (j = 0; j < d; j++)  {
 169                         u8 val = slit->entry[d*i + j];
 170                         if (i == j) {
 171                                 if (val != LOCAL_DISTANCE)
 172                                         return 0;
 173                         } else if (val <= LOCAL_DISTANCE)
 174                                 return 0;
 175                 }
 176         }
 177         return 1;
 178 }
 179
 180 static int __init acpi_parse_slit(struct acpi_table_header *table)
 181 {
 182         struct acpi_table_slit *slit;
 183
 184         if (!table)
 185                 return -EINVAL;
 186
 187         slit = (struct acpi_table_slit *)table;
 188
 189         if (!slit_valid(slit)) {
 190                 printk(KERN_INFO "ACPI: SLIT table looks invalid. Not used.\n");
 191                 return -EINVAL;
 192         }
 193         acpi_numa_slit_init(slit);
 194
 195         return 0;
 196 }
 197
 198 void __init __attribute__ ((weak))
 199 acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
 200 {
 201         printk(KERN_WARNING PREFIX
 202                "Found unsupported x2apic [0x%08x] SRAT entry\n", pa->apic_id);
 203         return;
 204 }
 205
 206
 207 static int __init
 208 acpi_parse_x2apic_affinity(struct acpi_subtable_header *header,
 209                            const unsigned long end)
 210 {
 211         struct acpi_srat_x2apic_cpu_affinity *processor_affinity;
 212
 213         processor_affinity = (struct acpi_srat_x2apic_cpu_affinity *)header;
 214         if (!processor_affinity)
 215                 return -EINVAL;
 216
 217         acpi_table_print_srat_entry(header);
 218
 219         /* let architecture-dependent part to do it */
 220         acpi_numa_x2apic_affinity_init(processor_affinity);
 221
 222         return 0;
 223 }
 224
 225 static int __init
 226 acpi_parse_processor_affinity(struct acpi_subtable_header *header,
 227                               const unsigned long end)
 228 {
 229         struct acpi_srat_cpu_affinity *processor_affinity;
 230
 231         processor_affinity = (struct acpi_srat_cpu_affinity *)header;
 232         if (!processor_affinity)
 233                 return -EINVAL;
 234
 235         acpi_table_print_srat_entry(header);
 236
 237         /* let architecture-dependent part to do it */
 238         acpi_numa_processor_affinity_init(processor_affinity);
 239
 240         return 0;
 241 }
 242
 243 static int __init
 244 acpi_parse_memory_affinity(struct acpi_subtable_header * header,
 245                            const unsigned long end)
 246 {
 247         struct acpi_srat_mem_affinity *memory_affinity;
 248
 249         memory_affinity = (struct acpi_srat_mem_affinity *)header;
 250         if (!memory_affinity)
 251                 return -EINVAL;
 252
 253         acpi_table_print_srat_entry(header);
 254
 255         /* let architecture-dependent part to do it */
 256         acpi_numa_memory_affinity_init(memory_affinity);
 257
 258         return 0;
 259 }
 260
 261 static int __init acpi_parse_srat(struct acpi_table_header *table)
 262 {
 263         struct acpi_table_srat *srat;
 264
 265         if (!table)
 266                 return -EINVAL;
 267
 268         srat = (struct acpi_table_srat *)table;
 269
 270         return 0;
 271 }
 272
 273 static int __init
 274 acpi_table_parse_srat(enum acpi_srat_type id,
 275                       acpi_table_entry_handler handler, unsigned int max_entries)
 276 {
 277         return acpi_table_parse_entries(ACPI_SIG_SRAT,
 278                                             sizeof(struct acpi_table_srat), id,
 279                                             handler, max_entries);
 280 }
 281
 282 int __init acpi_numa_init(void)
 283 {
 284         /* SRAT: Static Resource Affinity Table */
 285         if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) {
 286                 acpi_table_parse_srat(ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY,
 287                                       acpi_parse_x2apic_affinity, NR_CPUS);
 288                 acpi_table_parse_srat(ACPI_SRAT_TYPE_CPU_AFFINITY,
 289                                       acpi_parse_processor_affinity, NR_CPUS);
 290                 acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
 291                                       acpi_parse_memory_affinity,
 292                                       NR_NODE_MEMBLKS);
 293         }
 294
 295         /* SLIT: System Locality Information Table */
 296         acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit);
 297
 298         acpi_numa_arch_fixup();
 299         return 0;
 300 }
 301
 302 int acpi_get_pxm(acpi_handle h)
 303 {
 304         unsigned long long pxm;
 305         acpi_status status;
 306         acpi_handle handle;
 307         acpi_handle phandle = h;
 308
 309         do {
 310                 handle = phandle;
 311                 status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm);
 312                 if (ACPI_SUCCESS(status))
 313                         return pxm;
 314                 status = acpi_get_parent(handle, &phandle);
 315         } while (ACPI_SUCCESS(status));
 316         return -1;
 317 }
 318
 319 int acpi_get_node(acpi_handle *handle)
 320 {
 321         int pxm, node = -1;
 322
 323         pxm = acpi_get_pxm(handle);
 324         if (pxm >= 0 && pxm < MAX_PXM_DOMAINS)
 325                 node = acpi_map_pxm_to_node(pxm);
 326
 327         return node;
 328 }
 329 EXPORT_SYMBOL(acpi_get_node);