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   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 type 0x%x) in proximity domain %d %s%s\n",
 124                                           (unsigned long)p->base_address,
 125                                           (unsigned long)p->length,
 126                                           p->memory_type, 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 static int __init acpi_parse_slit(struct acpi_table_header *table)
 144 {
 145         struct acpi_table_slit *slit;
 146         u32 localities;
 147
 148         if (!table)
 149                 return -EINVAL;
 150
 151         slit = (struct acpi_table_slit *)table;
 152
 153         /* downcast just for %llu vs %lu for i386/ia64  */
 154         localities = (u32) slit->locality_count;
 155
 156         acpi_numa_slit_init(slit);
 157
 158         return 0;
 159 }
 160
 161 static int __init
 162 acpi_parse_processor_affinity(struct acpi_subtable_header * header,
 163                               const unsigned long end)
 164 {
 165         struct acpi_srat_cpu_affinity *processor_affinity;
 166
 167         processor_affinity = (struct acpi_srat_cpu_affinity *)header;
 168         if (!processor_affinity)
 169                 return -EINVAL;
 170
 171         acpi_table_print_srat_entry(header);
 172
 173         /* let architecture-dependent part to do it */
 174         acpi_numa_processor_affinity_init(processor_affinity);
 175
 176         return 0;
 177 }
 178
 179 static int __init
 180 acpi_parse_memory_affinity(struct acpi_subtable_header * header,
 181                            const unsigned long end)
 182 {
 183         struct acpi_srat_mem_affinity *memory_affinity;
 184
 185         memory_affinity = (struct acpi_srat_mem_affinity *)header;
 186         if (!memory_affinity)
 187                 return -EINVAL;
 188
 189         acpi_table_print_srat_entry(header);
 190
 191         /* let architecture-dependent part to do it */
 192         acpi_numa_memory_affinity_init(memory_affinity);
 193
 194         return 0;
 195 }
 196
 197 static int __init acpi_parse_srat(struct acpi_table_header *table)
 198 {
 199         struct acpi_table_srat *srat;
 200
 201         if (!table)
 202                 return -EINVAL;
 203
 204         srat = (struct acpi_table_srat *)table;
 205
 206         return 0;
 207 }
 208
 209 static int __init
 210 acpi_table_parse_srat(enum acpi_srat_type id,
 211                       acpi_table_entry_handler handler, unsigned int max_entries)
 212 {
 213         return acpi_table_parse_entries(ACPI_SIG_SRAT,
 214                                             sizeof(struct acpi_table_srat), id,
 215                                             handler, max_entries);
 216 }
 217
 218 int __init acpi_numa_init(void)
 219 {
 220         /* SRAT: Static Resource Affinity Table */
 221         if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) {
 222                 acpi_table_parse_srat(ACPI_SRAT_TYPE_CPU_AFFINITY,
 223                                       acpi_parse_processor_affinity, NR_CPUS);
 224                 acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
 225                                       acpi_parse_memory_affinity,
 226                                       NR_NODE_MEMBLKS);
 227         }
 228
 229         /* SLIT: System Locality Information Table */
 230         acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit);
 231
 232         acpi_numa_arch_fixup();
 233         return 0;
 234 }
 235
 236 int acpi_get_pxm(acpi_handle h)
 237 {
 238         unsigned long pxm;
 239         acpi_status status;
 240         acpi_handle handle;
 241         acpi_handle phandle = h;
 242
 243         do {
 244                 handle = phandle;
 245                 status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm);
 246                 if (ACPI_SUCCESS(status))
 247                         return pxm;
 248                 status = acpi_get_parent(handle, &phandle);
 249         } while (ACPI_SUCCESS(status));
 250         return -1;
 251 }
 252
 253 int acpi_get_node(acpi_handle *handle)
 254 {
 255         int pxm, node = -1;
 256
 257         pxm = acpi_get_pxm(handle);
 258         if (pxm >= 0)
 259                 node = acpi_map_pxm_to_node(pxm);
 260
 261         return node;
 262 }
 263 EXPORT_SYMBOL(acpi_get_node);