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 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
  89 static void __init
  90 acpi_table_print_srat_entry(struct acpi_subtable_header *header)
  91 {
  92
  93         ACPI_FUNCTION_NAME("acpi_table_print_srat_entry");
  94
  95         if (!header)
  96                 return;
  97
  98         switch (header->type) {
  99
 100         case ACPI_SRAT_TYPE_CPU_AFFINITY:
 101 #ifdef ACPI_DEBUG_OUTPUT
 102                 {
 103                         struct acpi_srat_cpu_affinity *p =
 104                             (struct acpi_srat_cpu_affinity *)header;
 105                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 106                                           "SRAT Processor (id[0x%02x] eid[0x%02x]) in proximity domain %d %s\n",
 107                                           p->apic_id, p->local_sapic_eid,
 108                                           p->proximity_domain_lo,
 109                                           (p->flags & ACPI_SRAT_CPU_ENABLED)?
 110                                           "enabled" : "disabled"));
 111                 }
 112 #endif                          /* ACPI_DEBUG_OUTPUT */
 113                 break;
 114
 115         case ACPI_SRAT_TYPE_MEMORY_AFFINITY:
 116 #ifdef ACPI_DEBUG_OUTPUT
 117                 {
 118                         struct acpi_srat_mem_affinity *p =
 119                             (struct acpi_srat_mem_affinity *)header;
 120                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 121                                           "SRAT Memory (0x%lx length 0x%lx type 0x%x) in proximity domain %d %s%s\n",
 122                                           (unsigned long)p->base_address,
 123                                           (unsigned long)p->length,
 124                                           p->memory_type, p->proximity_domain,
 125                                           (p->flags & ACPI_SRAT_MEM_ENABLED)?
 126                                           "enabled" : "disabled",
 127                                           (p->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE)?
 128                                           " hot-pluggable" : ""));
 129                 }
 130 #endif                          /* ACPI_DEBUG_OUTPUT */
 131                 break;
 132
 133         default:
 134                 printk(KERN_WARNING PREFIX
 135                        "Found unsupported SRAT entry (type = 0x%x)\n",
 136                        header->type);
 137                 break;
 138         }
 139 }
 140
 141 static int __init acpi_parse_slit(struct acpi_table_header *table)
 142 {
 143         struct acpi_table_slit *slit;
 144         u32 localities;
 145
 146         if (!table)
 147                 return -EINVAL;
 148
 149         slit = (struct acpi_table_slit *)table;
 150
 151         /* downcast just for %llu vs %lu for i386/ia64  */
 152         localities = (u32) slit->locality_count;
 153
 154         acpi_numa_slit_init(slit);
 155
 156         return 0;
 157 }
 158
 159 static int __init
 160 acpi_parse_processor_affinity(struct acpi_subtable_header * header,
 161                               const unsigned long end)
 162 {
 163         struct acpi_srat_cpu_affinity *processor_affinity;
 164
 165         processor_affinity = (struct acpi_srat_cpu_affinity *)header;
 166         if (!processor_affinity)
 167                 return -EINVAL;
 168
 169         acpi_table_print_srat_entry(header);
 170
 171         /* let architecture-dependent part to do it */
 172         acpi_numa_processor_affinity_init(processor_affinity);
 173
 174         return 0;
 175 }
 176
 177 static int __init
 178 acpi_parse_memory_affinity(struct acpi_subtable_header * header,
 179                            const unsigned long end)
 180 {
 181         struct acpi_srat_mem_affinity *memory_affinity;
 182
 183         memory_affinity = (struct acpi_srat_mem_affinity *)header;
 184         if (!memory_affinity)
 185                 return -EINVAL;
 186
 187         acpi_table_print_srat_entry(header);
 188
 189         /* let architecture-dependent part to do it */
 190         acpi_numa_memory_affinity_init(memory_affinity);
 191
 192         return 0;
 193 }
 194
 195 static int __init acpi_parse_srat(struct acpi_table_header *table)
 196 {
 197         struct acpi_table_srat *srat;
 198
 199         if (!table)
 200                 return -EINVAL;
 201
 202         srat = (struct acpi_table_srat *)table;
 203
 204         return 0;
 205 }
 206
 207 static int __init
 208 acpi_table_parse_srat(enum acpi_srat_type id,
 209                       acpi_table_entry_handler handler, unsigned int max_entries)
 210 {
 211         return acpi_table_parse_entries(ACPI_SIG_SRAT,
 212                                             sizeof(struct acpi_table_srat), id,
 213                                             handler, max_entries);
 214 }
 215
 216 int __init acpi_numa_init(void)
 217 {
 218         /* SRAT: Static Resource Affinity Table */
 219         if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) {
 220                 acpi_table_parse_srat(ACPI_SRAT_TYPE_CPU_AFFINITY,
 221                                       acpi_parse_processor_affinity, NR_CPUS);
 222                 acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
 223                                       acpi_parse_memory_affinity,
 224                                       NR_NODE_MEMBLKS);
 225         }
 226
 227         /* SLIT: System Locality Information Table */
 228         acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit);
 229
 230         acpi_numa_arch_fixup();
 231         return 0;
 232 }
 233
 234 int acpi_get_pxm(acpi_handle h)
 235 {
 236         unsigned long pxm;
 237         acpi_status status;
 238         acpi_handle handle;
 239         acpi_handle phandle = h;
 240
 241         do {
 242                 handle = phandle;
 243                 status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm);
 244                 if (ACPI_SUCCESS(status))
 245                         return pxm;
 246                 status = acpi_get_parent(handle, &phandle);
 247         } while (ACPI_SUCCESS(status));
 248         return -1;
 249 }
 250 EXPORT_SYMBOL(acpi_get_pxm);
 251
 252 int acpi_get_node(acpi_handle *handle)
 253 {
 254         int pxm, node = -1;
 255
 256         pxm = acpi_get_pxm(handle);
 257         if (pxm >= 0)
 258                 node = acpi_map_pxm_to_node(pxm);
 259
 260         return node;
 261 }
 262 EXPORT_SYMBOL(acpi_get_node);