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 __cpuinitdata pxm_to_node_map[MAX_PXM_DOMAINS]
  44                                 = { [0 ... MAX_PXM_DOMAINS - 1] = NID_INVAL };
  45 static int __cpuinitdata 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 static void __init
  87 acpi_table_print_srat_entry(struct acpi_subtable_header *header)
  88 {
  89
  90         ACPI_FUNCTION_NAME("acpi_table_print_srat_entry");
  91
  92         if (!header)
  93                 return;
  94
  95         switch (header->type) {
  96
  97         case ACPI_SRAT_TYPE_CPU_AFFINITY:
  98 #ifdef ACPI_DEBUG_OUTPUT
  99                 {
 100                         struct acpi_srat_cpu_affinity *p =
 101                             (struct acpi_srat_cpu_affinity *)header;
 102                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 103                                           "SRAT Processor (id[0x%02x] eid[0x%02x]) in proximity domain %d %s\n",
 104                                           p->apic_id, p->local_sapic_eid,
 105                                           p->proximity_domain_lo,
 106                                           (p->flags & ACPI_SRAT_CPU_ENABLED)?
 107                                           "enabled" : "disabled"));
 108                 }
 109 #endif                          /* ACPI_DEBUG_OUTPUT */
 110                 break;
 111
 112         case ACPI_SRAT_TYPE_MEMORY_AFFINITY:
 113 #ifdef ACPI_DEBUG_OUTPUT
 114                 {
 115                         struct acpi_srat_mem_affinity *p =
 116                             (struct acpi_srat_mem_affinity *)header;
 117                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 118                                           "SRAT Memory (0x%lx length 0x%lx type 0x%x) in proximity domain %d %s%s\n",
 119                                           (unsigned long)p->base_address,
 120                                           (unsigned long)p->length,
 121                                           p->memory_type, p->proximity_domain,
 122                                           (p->flags & ACPI_SRAT_MEM_ENABLED)?
 123                                           "enabled" : "disabled",
 124                                           (p->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE)?
 125                                           " hot-pluggable" : ""));
 126                 }
 127 #endif                          /* ACPI_DEBUG_OUTPUT */
 128                 break;
 129
 130         default:
 131                 printk(KERN_WARNING PREFIX
 132                        "Found unsupported SRAT entry (type = 0x%x)\n",
 133                        header->type);
 134                 break;
 135         }
 136 }
 137
 138 static int __init acpi_parse_slit(struct acpi_table_header *table)
 139 {
 140         struct acpi_table_slit *slit;
 141         u32 localities;
 142
 143         if (!table)
 144                 return -EINVAL;
 145
 146         slit = (struct acpi_table_slit *)table;
 147
 148         /* downcast just for %llu vs %lu for i386/ia64  */
 149         localities = (u32) slit->locality_count;
 150
 151         acpi_numa_slit_init(slit);
 152
 153         return 0;
 154 }
 155
 156 static int __init
 157 acpi_parse_processor_affinity(struct acpi_subtable_header * header,
 158                               const unsigned long end)
 159 {
 160         struct acpi_srat_cpu_affinity *processor_affinity;
 161
 162         processor_affinity = (struct acpi_srat_cpu_affinity *)header;
 163         if (!processor_affinity)
 164                 return -EINVAL;
 165
 166         acpi_table_print_srat_entry(header);
 167
 168         /* let architecture-dependent part to do it */
 169         acpi_numa_processor_affinity_init(processor_affinity);
 170
 171         return 0;
 172 }
 173
 174 static int __init
 175 acpi_parse_memory_affinity(struct acpi_subtable_header * header,
 176                            const unsigned long end)
 177 {
 178         struct acpi_srat_mem_affinity *memory_affinity;
 179
 180         memory_affinity = (struct acpi_srat_mem_affinity *)header;
 181         if (!memory_affinity)
 182                 return -EINVAL;
 183
 184         acpi_table_print_srat_entry(header);
 185
 186         /* let architecture-dependent part to do it */
 187         acpi_numa_memory_affinity_init(memory_affinity);
 188
 189         return 0;
 190 }
 191
 192 static int __init acpi_parse_srat(struct acpi_table_header *table)
 193 {
 194         struct acpi_table_srat *srat;
 195
 196         if (!table)
 197                 return -EINVAL;
 198
 199         srat = (struct acpi_table_srat *)table;
 200
 201         return 0;
 202 }
 203
 204 static int __init
 205 acpi_table_parse_srat(enum acpi_srat_type id,
 206                       acpi_table_entry_handler handler, unsigned int max_entries)
 207 {
 208         return acpi_table_parse_entries(ACPI_SIG_SRAT,
 209                                             sizeof(struct acpi_table_srat), id,
 210                                             handler, max_entries);
 211 }
 212
 213 int __init acpi_numa_init(void)
 214 {
 215         /* SRAT: Static Resource Affinity Table */
 216         if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) {
 217                 acpi_table_parse_srat(ACPI_SRAT_TYPE_CPU_AFFINITY,
 218                                       acpi_parse_processor_affinity, NR_CPUS);
 219                 acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
 220                                       acpi_parse_memory_affinity,
 221                                       NR_NODE_MEMBLKS);
 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);