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