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 <linux/numa.h>
  32 #include <acpi/acpi_bus.h>
  33
  34 #define PREFIX "ACPI: "
  35
  36 #define ACPI_NUMA       0x80000000
  37 #define _COMPONENT      ACPI_NUMA
  38 ACPI_MODULE_NAME("numa");
  39
  40 static nodemask_t nodes_found_map = NODE_MASK_NONE;
  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] = NUMA_NO_NODE };
  45 static int node_to_pxm_map[MAX_NUMNODES]
  46                         = { [0 ... MAX_NUMNODES - 1] = PXM_INVAL };
  47
  48 unsigned char acpi_srat_revision __initdata;
  49
  50 int pxm_to_node(int pxm)
  51 {
  52         if (pxm < 0)
  53                 return NUMA_NO_NODE;
  54         return pxm_to_node_map[pxm];
  55 }
  56
  57 int node_to_pxm(int node)
  58 {
  59         if (node < 0)
  60                 return PXM_INVAL;
  61         return node_to_pxm_map[node];
  62 }
  63
  64 void __acpi_map_pxm_to_node(int pxm, int node)
  65 {
  66         if (pxm_to_node_map[pxm] == NUMA_NO_NODE || node < pxm_to_node_map[pxm])
  67                 pxm_to_node_map[pxm] = node;
  68         if (node_to_pxm_map[node] == PXM_INVAL || pxm < node_to_pxm_map[node])
  69                 node_to_pxm_map[node] = pxm;
  70 }
  71
  72 int acpi_map_pxm_to_node(int pxm)
  73 {
  74         int node = pxm_to_node_map[pxm];
  75
  76         if (node < 0) {
  77                 if (nodes_weight(nodes_found_map) >= MAX_NUMNODES)
  78                         return NUMA_NO_NODE;
  79                 node = first_unset_node(nodes_found_map);
  80                 __acpi_map_pxm_to_node(pxm, node);
  81                 node_set(node, nodes_found_map);
  82         }
  83
  84         return node;
  85 }
  86
  87 static void __init
  88 acpi_table_print_srat_entry(struct acpi_subtable_header *header)
  89 {
  90
  91         ACPI_FUNCTION_NAME("acpi_table_print_srat_entry");
  92
  93         if (!header)
  94                 return;
  95
  96         switch (header->type) {
  97
  98         case ACPI_SRAT_TYPE_CPU_AFFINITY:
  99 #ifdef ACPI_DEBUG_OUTPUT
 100                 {
 101                         struct acpi_srat_cpu_affinity *p =
 102                             (struct acpi_srat_cpu_affinity *)header;
 103                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 104                                           "SRAT Processor (id[0x%02x] eid[0x%02x]) in proximity domain %d %s\n",
 105                                           p->apic_id, p->local_sapic_eid,
 106                                           p->proximity_domain_lo,
 107                                           (p->flags & ACPI_SRAT_CPU_ENABLED)?
 108                                           "enabled" : "disabled"));
 109                 }
 110 #endif                          /* ACPI_DEBUG_OUTPUT */
 111                 break;
 112
 113         case ACPI_SRAT_TYPE_MEMORY_AFFINITY:
 114 #ifdef ACPI_DEBUG_OUTPUT
 115                 {
 116                         struct acpi_srat_mem_affinity *p =
 117                             (struct acpi_srat_mem_affinity *)header;
 118                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 119                                           "SRAT Memory (0x%lx length 0x%lx) in proximity domain %d %s%s\n",
 120                                           (unsigned long)p->base_address,
 121                                           (unsigned long)p->length,
 122                                           p->proximity_domain,
 123                                           (p->flags & ACPI_SRAT_MEM_ENABLED)?
 124                                           "enabled" : "disabled",
 125                                           (p->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE)?
 126                                           " hot-pluggable" : ""));
 127                 }
 128 #endif                          /* ACPI_DEBUG_OUTPUT */
 129                 break;
 130
 131         case ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY:
 132 #ifdef ACPI_DEBUG_OUTPUT
 133                 {
 134                         struct acpi_srat_x2apic_cpu_affinity *p =
 135                             (struct acpi_srat_x2apic_cpu_affinity *)header;
 136                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 137                                           "SRAT Processor (x2apicid[0x%08x]) in"
 138                                           " proximity domain %d %s\n",
 139                                           p->apic_id,
 140                                           p->proximity_domain,
 141                                           (p->flags & ACPI_SRAT_CPU_ENABLED) ?
 142                                           "enabled" : "disabled"));
 143                 }
 144 #endif                          /* ACPI_DEBUG_OUTPUT */
 145                 break;
 146         default:
 147                 printk(KERN_WARNING PREFIX
 148                        "Found unsupported SRAT entry (type = 0x%x)\n",
 149                        header->type);
 150                 break;
 151         }
 152 }
 153
 154 /*
 155  * A lot of BIOS fill in 10 (= no distance) everywhere. This messes
 156  * up the NUMA heuristics which wants the local node to have a smaller
 157  * distance than the others.
 158  * Do some quick checks here and only use the SLIT if it passes.
 159  */
 160 static __init int slit_valid(struct acpi_table_slit *slit)
 161 {
 162         int i, j;
 163         int d = slit->locality_count;
 164         for (i = 0; i < d; i++) {
 165                 for (j = 0; j < d; j++)  {
 166                         u8 val = slit->entry[d*i + j];
 167                         if (i == j) {
 168                                 if (val != LOCAL_DISTANCE)
 169                                         return 0;
 170                         } else if (val <= LOCAL_DISTANCE)
 171                                 return 0;
 172                 }
 173         }
 174         return 1;
 175 }
 176
 177 static int __init acpi_parse_slit(struct acpi_table_header *table)
 178 {
 179         struct acpi_table_slit *slit;
 180
 181         if (!table)
 182                 return -EINVAL;
 183
 184         slit = (struct acpi_table_slit *)table;
 185
 186         if (!slit_valid(slit)) {
 187                 printk(KERN_INFO "ACPI: SLIT table looks invalid. Not used.\n");
 188                 return -EINVAL;
 189         }
 190         acpi_numa_slit_init(slit);
 191
 192         return 0;
 193 }
 194
 195 void __init __attribute__ ((weak))
 196 acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
 197 {
 198         printk(KERN_WARNING PREFIX
 199                "Found unsupported x2apic [0x%08x] SRAT entry\n", pa->apic_id);
 200         return;
 201 }
 202
 203
 204 static int __init
 205 acpi_parse_x2apic_affinity(struct acpi_subtable_header *header,
 206                            const unsigned long end)
 207 {
 208         struct acpi_srat_x2apic_cpu_affinity *processor_affinity;
 209
 210         processor_affinity = (struct acpi_srat_x2apic_cpu_affinity *)header;
 211         if (!processor_affinity)
 212                 return -EINVAL;
 213
 214         acpi_table_print_srat_entry(header);
 215
 216         /* let architecture-dependent part to do it */
 217         acpi_numa_x2apic_affinity_init(processor_affinity);
 218
 219         return 0;
 220 }
 221
 222 static int __init
 223 acpi_parse_processor_affinity(struct acpi_subtable_header *header,
 224                               const unsigned long end)
 225 {
 226         struct acpi_srat_cpu_affinity *processor_affinity;
 227
 228         processor_affinity = (struct acpi_srat_cpu_affinity *)header;
 229         if (!processor_affinity)
 230                 return -EINVAL;
 231
 232         acpi_table_print_srat_entry(header);
 233
 234         /* let architecture-dependent part to do it */
 235         acpi_numa_processor_affinity_init(processor_affinity);
 236
 237         return 0;
 238 }
 239
 240 static int __initdata parsed_numa_memblks;
 241
 242 static int __init
 243 acpi_parse_memory_affinity(struct acpi_subtable_header * header,
 244                            const unsigned long end)
 245 {
 246         struct acpi_srat_mem_affinity *memory_affinity;
 247
 248         memory_affinity = (struct acpi_srat_mem_affinity *)header;
 249         if (!memory_affinity)
 250                 return -EINVAL;
 251
 252         acpi_table_print_srat_entry(header);
 253
 254         /* let architecture-dependent part to do it */
 255         if (!acpi_numa_memory_affinity_init(memory_affinity))
 256                 parsed_numa_memblks++;
 257         return 0;
 258 }
 259
 260 static int __init acpi_parse_srat(struct acpi_table_header *table)
 261 {
 262         struct acpi_table_srat *srat;
 263         if (!table)
 264                 return -EINVAL;
 265
 266         srat = (struct acpi_table_srat *)table;
 267         acpi_srat_revision = srat->header.revision;
 268
 269         /* Real work done in acpi_table_parse_srat below. */
 270
 271         return 0;
 272 }
 273
 274 static int __init
 275 acpi_table_parse_srat(enum acpi_srat_type id,
 276                       acpi_table_entry_handler handler, unsigned int max_entries)
 277 {
 278         return acpi_table_parse_entries(ACPI_SIG_SRAT,
 279                                             sizeof(struct acpi_table_srat), id,
 280                                             handler, max_entries);
 281 }
 282
 283 int __init acpi_numa_init(void)
 284 {
 285         int cnt = 0;
 286
 287         /*
 288          * Should not limit number with cpu num that is from NR_CPUS or nr_cpus=
 289          * SRAT cpu entries could have different order with that in MADT.
 290          * So go over all cpu entries in SRAT to get apicid to node mapping.
 291          */
 292
 293         /* SRAT: Static Resource Affinity Table */
 294         if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) {
 295                 acpi_table_parse_srat(ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY,
 296                                      acpi_parse_x2apic_affinity, 0);
 297                 acpi_table_parse_srat(ACPI_SRAT_TYPE_CPU_AFFINITY,
 298                                      acpi_parse_processor_affinity, 0);
 299                 cnt = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
 300                                             acpi_parse_memory_affinity,
 301                                             NR_NODE_MEMBLKS);
 302         }
 303
 304         /* SLIT: System Locality Information Table */
 305         acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit);
 306
 307         acpi_numa_arch_fixup();
 308
 309         if (cnt < 0)
 310                 return cnt;
 311         else if (!parsed_numa_memblks)
 312                 return -ENOENT;
 313         return 0;
 314 }
 315
 316 int acpi_get_pxm(acpi_handle h)
 317 {
 318         unsigned long long pxm;
 319         acpi_status status;
 320         acpi_handle handle;
 321         acpi_handle phandle = h;
 322
 323         do {
 324                 handle = phandle;
 325                 status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm);
 326                 if (ACPI_SUCCESS(status))
 327                         return pxm;
 328                 status = acpi_get_parent(handle, &phandle);
 329         } while (ACPI_SUCCESS(status));
 330         return -1;
 331 }
 332
 333 int acpi_get_node(acpi_handle *handle)
 334 {
 335         int pxm, node = -1;
 336
 337         pxm = acpi_get_pxm(handle);
 338         if (pxm >= 0 && pxm < MAX_PXM_DOMAINS)
 339                 node = acpi_map_pxm_to_node(pxm);
 340
 341         return node;
 342 }
 343 EXPORT_SYMBOL(acpi_get_node);