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