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 #define PXM_INVAL       -1
  40 #define NID_INVAL       -1
  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] = NID_INVAL };
  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 NID_INVAL;
  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 int acpi_map_pxm_to_node(int pxm)
  63 {
  64         int node = pxm_to_node_map[pxm];
  65
  66         if (node < 0){
  67                 if (nodes_weight(nodes_found_map) >= MAX_NUMNODES)
  68                         return NID_INVAL;
  69                 node = first_unset_node(nodes_found_map);
  70                 pxm_to_node_map[pxm] = node;
  71                 node_to_pxm_map[node] = pxm;
  72                 node_set(node, nodes_found_map);
  73         }
  74
  75         return node;
  76 }
  77
  78 void __cpuinit acpi_unmap_pxm_to_node(int node)
  79 {
  80         int pxm = node_to_pxm_map[node];
  81         pxm_to_node_map[pxm] = NID_INVAL;
  82         node_to_pxm_map[node] = PXM_INVAL;
  83         node_clear(node, nodes_found_map);
  84 }
  85
  86 void __init 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 type 0x%x) in proximity domain %d %s%s\n",
 118                                           (unsigned long)p->base_address,
 119                                           (unsigned long)p->length,
 120                                           p->memory_type, 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         default:
 130                 printk(KERN_WARNING PREFIX
 131                        "Found unsupported SRAT entry (type = 0x%x)\n",
 132                        header->type);
 133                 break;
 134         }
 135 }
 136
 137 static int __init acpi_parse_slit(struct acpi_table_header *table)
 138 {
 139         struct acpi_table_slit *slit;
 140         u32 localities;
 141
 142         if (!table)
 143                 return -EINVAL;
 144
 145         slit = (struct acpi_table_slit *)table;
 146
 147         /* downcast just for %llu vs %lu for i386/ia64  */
 148         localities = (u32) slit->locality_count;
 149
 150         acpi_numa_slit_init(slit);
 151
 152         return 0;
 153 }
 154
 155 static int __init
 156 acpi_parse_processor_affinity(struct acpi_subtable_header * header,
 157                               const unsigned long end)
 158 {
 159         struct acpi_srat_cpu_affinity *processor_affinity;
 160
 161         processor_affinity = (struct acpi_srat_cpu_affinity *)header;
 162         if (!processor_affinity)
 163                 return -EINVAL;
 164
 165         acpi_table_print_srat_entry(header);
 166
 167         /* let architecture-dependent part to do it */
 168         acpi_numa_processor_affinity_init(processor_affinity);
 169
 170         return 0;
 171 }
 172
 173 static int __init
 174 acpi_parse_memory_affinity(struct acpi_subtable_header * header,
 175                            const unsigned long end)
 176 {
 177         struct acpi_srat_mem_affinity *memory_affinity;
 178
 179         memory_affinity = (struct acpi_srat_mem_affinity *)header;
 180         if (!memory_affinity)
 181                 return -EINVAL;
 182
 183         acpi_table_print_srat_entry(header);
 184
 185         /* let architecture-dependent part to do it */
 186         acpi_numa_memory_affinity_init(memory_affinity);
 187
 188         return 0;
 189 }
 190
 191 static int __init acpi_parse_srat(struct acpi_table_header *table)
 192 {
 193         struct acpi_table_srat *srat;
 194
 195         if (!table)
 196                 return -EINVAL;
 197
 198         srat = (struct acpi_table_srat *)table;
 199
 200         return 0;
 201 }
 202
 203 int __init
 204 acpi_table_parse_srat(enum acpi_srat_type id,
 205                       acpi_table_entry_handler handler, unsigned int max_entries)
 206 {
 207         return acpi_table_parse_entries(ACPI_SIG_SRAT,
 208                                             sizeof(struct acpi_table_srat), id,
 209                                             handler, max_entries);
 210 }
 211
 212 int __init acpi_numa_init(void)
 213 {
 214         int result;
 215
 216         /* SRAT: Static Resource Affinity Table */
 217         if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) {
 218                 result = acpi_table_parse_srat(ACPI_SRAT_TYPE_CPU_AFFINITY,
 219                                                acpi_parse_processor_affinity,
 220                                                NR_CPUS);
 221                 result = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY, acpi_parse_memory_affinity, NR_NODE_MEMBLKS);    // IA64 specific
 222         }
 223
 224         /* SLIT: System Locality Information Table */
 225         acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit);
 226
 227         acpi_numa_arch_fixup();
 228         return 0;
 229 }
 230
 231 int acpi_get_pxm(acpi_handle h)
 232 {
 233         unsigned long pxm;
 234         acpi_status status;
 235         acpi_handle handle;
 236         acpi_handle phandle = h;
 237
 238         do {
 239                 handle = phandle;
 240                 status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm);
 241                 if (ACPI_SUCCESS(status))
 242                         return pxm;
 243                 status = acpi_get_parent(handle, &phandle);
 244         } while (ACPI_SUCCESS(status));
 245         return -1;
 246 }
 247 EXPORT_SYMBOL(acpi_get_pxm);
 248
 249 int acpi_get_node(acpi_handle *handle)
 250 {
 251         int pxm, node = -1;
 252
 253         pxm = acpi_get_pxm(handle);
 254         if (pxm >= 0)
 255                 node = acpi_map_pxm_to_node(pxm);
 256
 257         return node;
 258 }
 259 EXPORT_SYMBOL(acpi_get_node);