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 PREFIX "ACPI: "
  34
  35 #define ACPI_NUMA       0x80000000
  36 #define _COMPONENT      ACPI_NUMA
  37 ACPI_MODULE_NAME("numa");
  38
  39 static nodemask_t nodes_found_map = NODE_MASK_NONE;
  40
  41 /* maps to convert between proximity domain and logical node ID */
  42 static int pxm_to_node_map[MAX_PXM_DOMAINS]
  43                                 = { [0 ... MAX_PXM_DOMAINS - 1] = NID_INVAL };
  44 static int node_to_pxm_map[MAX_NUMNODES]
  45                                 = { [0 ... MAX_NUMNODES - 1] = PXM_INVAL };
  46
  47 int pxm_to_node(int pxm)
  48 {
  49         if (pxm < 0)
  50                 return NID_INVAL;
  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 void __acpi_map_pxm_to_node(int pxm, int node)
  62 {
  63         pxm_to_node_map[pxm] = node;
  64         node_to_pxm_map[node] = pxm;
  65 }
  66
  67 int acpi_map_pxm_to_node(int pxm)
  68 {
  69         int node = pxm_to_node_map[pxm];
  70
  71         if (node < 0){
  72                 if (nodes_weight(nodes_found_map) >= MAX_NUMNODES)
  73                         return NID_INVAL;
  74                 node = first_unset_node(nodes_found_map);
  75                 __acpi_map_pxm_to_node(pxm, node);
  76                 node_set(node, nodes_found_map);
  77         }
  78
  79         return node;
  80 }
  81
  82 #if 0
  83 void __cpuinit acpi_unmap_pxm_to_node(int node)
  84 {
  85         int pxm = node_to_pxm_map[node];
  86         pxm_to_node_map[pxm] = NID_INVAL;
  87         node_to_pxm_map[node] = PXM_INVAL;
  88         node_clear(node, nodes_found_map);
  89 }
  90 #endif  /*  0  */
  91
  92 static void __init
  93 acpi_table_print_srat_entry(struct acpi_subtable_header *header)
  94 {
  95
  96         ACPI_FUNCTION_NAME("acpi_table_print_srat_entry");
  97
  98         if (!header)
  99                 return;
 100
 101         switch (header->type) {
 102
 103         case ACPI_SRAT_TYPE_CPU_AFFINITY:
 104 #ifdef ACPI_DEBUG_OUTPUT
 105                 {
 106                         struct acpi_srat_cpu_affinity *p =
 107                             (struct acpi_srat_cpu_affinity *)header;
 108                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 109                                           "SRAT Processor (id[0x%02x] eid[0x%02x]) in proximity domain %d %s\n",
 110                                           p->apic_id, p->local_sapic_eid,
 111                                           p->proximity_domain_lo,
 112                                           (p->flags & ACPI_SRAT_CPU_ENABLED)?
 113                                           "enabled" : "disabled"));
 114                 }
 115 #endif                          /* ACPI_DEBUG_OUTPUT */
 116                 break;
 117
 118         case ACPI_SRAT_TYPE_MEMORY_AFFINITY:
 119 #ifdef ACPI_DEBUG_OUTPUT
 120                 {
 121                         struct acpi_srat_mem_affinity *p =
 122                             (struct acpi_srat_mem_affinity *)header;
 123                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 124                                           "SRAT Memory (0x%lx length 0x%lx) in proximity domain %d %s%s\n",
 125                                           (unsigned long)p->base_address,
 126                                           (unsigned long)p->length,
 127                                           p->proximity_domain,
 128                                           (p->flags & ACPI_SRAT_MEM_ENABLED)?
 129                                           "enabled" : "disabled",
 130                                           (p->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE)?
 131                                           " hot-pluggable" : ""));
 132                 }
 133 #endif                          /* ACPI_DEBUG_OUTPUT */
 134                 break;
 135
 136         case ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY:
 137 #ifdef ACPI_DEBUG_OUTPUT
 138                 {
 139                         struct acpi_srat_x2apic_cpu_affinity *p =
 140                             (struct acpi_srat_x2apic_cpu_affinity *)header;
 141                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 142                                           "SRAT Processor (x2apicid[0x%08x]) in"
 143                                           " proximity domain %d %s\n",
 144                                           p->apic_id,
 145                                           p->proximity_domain,
 146                                           (p->flags & ACPI_SRAT_CPU_ENABLED) ?
 147                                           "enabled" : "disabled"));
 148                 }
 149 #endif                          /* ACPI_DEBUG_OUTPUT */
 150                 break;
 151         default:
 152                 printk(KERN_WARNING PREFIX
 153                        "Found unsupported SRAT entry (type = 0x%x)\n",
 154                        header->type);
 155                 break;
 156         }
 157 }
 158
 159 /*
 160  * A lot of BIOS fill in 10 (= no distance) everywhere. This messes
 161  * up the NUMA heuristics which wants the local node to have a smaller
 162  * distance than the others.
 163  * Do some quick checks here and only use the SLIT if it passes.
 164  */
 165 static __init int slit_valid(struct acpi_table_slit *slit)
 166 {
 167         int i, j;
 168         int d = slit->locality_count;
 169         for (i = 0; i < d; i++) {
 170                 for (j = 0; j < d; j++)  {
 171                         u8 val = slit->entry[d*i + j];
 172                         if (i == j) {
 173                                 if (val != LOCAL_DISTANCE)
 174                                         return 0;
 175                         } else if (val <= LOCAL_DISTANCE)
 176                                 return 0;
 177                 }
 178         }
 179         return 1;
 180 }
 181
 182 static int __init acpi_parse_slit(struct acpi_table_header *table)
 183 {
 184         struct acpi_table_slit *slit;
 185
 186         if (!table)
 187                 return -EINVAL;
 188
 189         slit = (struct acpi_table_slit *)table;
 190
 191         if (!slit_valid(slit)) {
 192                 printk(KERN_INFO "ACPI: SLIT table looks invalid. Not used.\n");
 193                 return -EINVAL;
 194         }
 195         acpi_numa_slit_init(slit);
 196
 197         return 0;
 198 }
 199
 200 void __init __attribute__ ((weak))
 201 acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
 202 {
 203         printk(KERN_WARNING PREFIX
 204                "Found unsupported x2apic [0x%08x] SRAT entry\n", pa->apic_id);
 205         return;
 206 }
 207
 208
 209 static int __init
 210 acpi_parse_x2apic_affinity(struct acpi_subtable_header *header,
 211                            const unsigned long end)
 212 {
 213         struct acpi_srat_x2apic_cpu_affinity *processor_affinity;
 214
 215         processor_affinity = (struct acpi_srat_x2apic_cpu_affinity *)header;
 216         if (!processor_affinity)
 217                 return -EINVAL;
 218
 219         acpi_table_print_srat_entry(header);
 220
 221         /* let architecture-dependent part to do it */
 222         acpi_numa_x2apic_affinity_init(processor_affinity);
 223
 224         return 0;
 225 }
 226
 227 static int __init
 228 acpi_parse_processor_affinity(struct acpi_subtable_header *header,
 229                               const unsigned long end)
 230 {
 231         struct acpi_srat_cpu_affinity *processor_affinity;
 232
 233         processor_affinity = (struct acpi_srat_cpu_affinity *)header;
 234         if (!processor_affinity)
 235                 return -EINVAL;
 236
 237         acpi_table_print_srat_entry(header);
 238
 239         /* let architecture-dependent part to do it */
 240         acpi_numa_processor_affinity_init(processor_affinity);
 241
 242         return 0;
 243 }
 244
 245 static int __init
 246 acpi_parse_memory_affinity(struct acpi_subtable_header * header,
 247                            const unsigned long end)
 248 {
 249         struct acpi_srat_mem_affinity *memory_affinity;
 250
 251         memory_affinity = (struct acpi_srat_mem_affinity *)header;
 252         if (!memory_affinity)
 253                 return -EINVAL;
 254
 255         acpi_table_print_srat_entry(header);
 256
 257         /* let architecture-dependent part to do it */
 258         acpi_numa_memory_affinity_init(memory_affinity);
 259
 260         return 0;
 261 }
 262
 263 static int __init acpi_parse_srat(struct acpi_table_header *table)
 264 {
 265         struct acpi_table_srat *srat;
 266
 267         if (!table)
 268                 return -EINVAL;
 269
 270         srat = (struct acpi_table_srat *)table;
 271
 272         return 0;
 273 }
 274
 275 static int __init
 276 acpi_table_parse_srat(enum acpi_srat_type id,
 277                       acpi_table_entry_handler handler, unsigned int max_entries)
 278 {
 279         return acpi_table_parse_entries(ACPI_SIG_SRAT,
 280                                             sizeof(struct acpi_table_srat), id,
 281                                             handler, max_entries);
 282 }
 283
 284 int __init acpi_numa_init(void)
 285 {
 286         /* SRAT: Static Resource Affinity Table */
 287         if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) {
 288                 acpi_table_parse_srat(ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY,
 289                                       acpi_parse_x2apic_affinity, NR_CPUS);
 290                 acpi_table_parse_srat(ACPI_SRAT_TYPE_CPU_AFFINITY,
 291                                       acpi_parse_processor_affinity, NR_CPUS);
 292                 acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
 293                                       acpi_parse_memory_affinity,
 294                                       NR_NODE_MEMBLKS);
 295         }
 296
 297         /* SLIT: System Locality Information Table */
 298         acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit);
 299
 300         acpi_numa_arch_fixup();
 301         return 0;
 302 }
 303
 304 int acpi_get_pxm(acpi_handle h)
 305 {
 306         unsigned long long pxm;
 307         acpi_status status;
 308         acpi_handle handle;
 309         acpi_handle phandle = h;
 310
 311         do {
 312                 handle = phandle;
 313                 status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm);
 314                 if (ACPI_SUCCESS(status))
 315                         return pxm;
 316                 status = acpi_get_parent(handle, &phandle);
 317         } while (ACPI_SUCCESS(status));
 318         return -1;
 319 }
 320
 321 int acpi_get_node(acpi_handle *handle)
 322 {
 323         int pxm, node = -1;
 324
 325         pxm = acpi_get_pxm(handle);
 326         if (pxm >= 0 && pxm < MAX_PXM_DOMAINS)
 327                 node = acpi_map_pxm_to_node(pxm);
 328
 329         return node;
 330 }
 331 EXPORT_SYMBOL(acpi_get_node);