linux/drivers/acpi/numa.c
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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 <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
  38ACPI_MODULE_NAME("numa");
  39
  40static nodemask_t nodes_found_map = NODE_MASK_NONE;
  41
  42/* maps to convert between proximity domain and logical node ID */
  43static int pxm_to_node_map[MAX_PXM_DOMAINS]
  44                        = { [0 ... MAX_PXM_DOMAINS - 1] = NUMA_NO_NODE };
  45static int node_to_pxm_map[MAX_NUMNODES]
  46                        = { [0 ... MAX_NUMNODES - 1] = PXM_INVAL };
  47
  48unsigned char acpi_srat_revision __initdata;
  49
  50int pxm_to_node(int pxm)
  51{
  52        if (pxm < 0)
  53                return NUMA_NO_NODE;
  54        return pxm_to_node_map[pxm];
  55}
  56
  57int node_to_pxm(int node)
  58{
  59        if (node < 0)
  60                return PXM_INVAL;
  61        return node_to_pxm_map[node];
  62}
  63
  64void __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
  72int 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
  87static void __init
  88acpi_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%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                                          (p->flags & ACPI_SRAT_MEM_NON_VOLATILE)?
 128                                          " non-volatile" : ""));
 129                }
 130#endif                          /* ACPI_DEBUG_OUTPUT */
 131                break;
 132
 133        case ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY:
 134#ifdef ACPI_DEBUG_OUTPUT
 135                {
 136                        struct acpi_srat_x2apic_cpu_affinity *p =
 137                            (struct acpi_srat_x2apic_cpu_affinity *)header;
 138                        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 139                                          "SRAT Processor (x2apicid[0x%08x]) in"
 140                                          " proximity domain %d %s\n",
 141                                          p->apic_id,
 142                                          p->proximity_domain,
 143                                          (p->flags & ACPI_SRAT_CPU_ENABLED) ?
 144                                          "enabled" : "disabled"));
 145                }
 146#endif                          /* ACPI_DEBUG_OUTPUT */
 147                break;
 148        default:
 149                printk(KERN_WARNING PREFIX
 150                       "Found unsupported SRAT entry (type = 0x%x)\n",
 151                       header->type);
 152                break;
 153        }
 154}
 155
 156/*
 157 * A lot of BIOS fill in 10 (= no distance) everywhere. This messes
 158 * up the NUMA heuristics which wants the local node to have a smaller
 159 * distance than the others.
 160 * Do some quick checks here and only use the SLIT if it passes.
 161 */
 162static __init int slit_valid(struct acpi_table_slit *slit)
 163{
 164        int i, j;
 165        int d = slit->locality_count;
 166        for (i = 0; i < d; i++) {
 167                for (j = 0; j < d; j++)  {
 168                        u8 val = slit->entry[d*i + j];
 169                        if (i == j) {
 170                                if (val != LOCAL_DISTANCE)
 171                                        return 0;
 172                        } else if (val <= LOCAL_DISTANCE)
 173                                return 0;
 174                }
 175        }
 176        return 1;
 177}
 178
 179static int __init acpi_parse_slit(struct acpi_table_header *table)
 180{
 181        struct acpi_table_slit *slit;
 182
 183        if (!table)
 184                return -EINVAL;
 185
 186        slit = (struct acpi_table_slit *)table;
 187
 188        if (!slit_valid(slit)) {
 189                printk(KERN_INFO "ACPI: SLIT table looks invalid. Not used.\n");
 190                return -EINVAL;
 191        }
 192        acpi_numa_slit_init(slit);
 193
 194        return 0;
 195}
 196
 197void __init __attribute__ ((weak))
 198acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
 199{
 200        printk(KERN_WARNING PREFIX
 201               "Found unsupported x2apic [0x%08x] SRAT entry\n", pa->apic_id);
 202        return;
 203}
 204
 205
 206static int __init
 207acpi_parse_x2apic_affinity(struct acpi_subtable_header *header,
 208                           const unsigned long end)
 209{
 210        struct acpi_srat_x2apic_cpu_affinity *processor_affinity;
 211
 212        processor_affinity = (struct acpi_srat_x2apic_cpu_affinity *)header;
 213        if (!processor_affinity)
 214                return -EINVAL;
 215
 216        acpi_table_print_srat_entry(header);
 217
 218        /* let architecture-dependent part to do it */
 219        acpi_numa_x2apic_affinity_init(processor_affinity);
 220
 221        return 0;
 222}
 223
 224static int __init
 225acpi_parse_processor_affinity(struct acpi_subtable_header *header,
 226                              const unsigned long end)
 227{
 228        struct acpi_srat_cpu_affinity *processor_affinity;
 229
 230        processor_affinity = (struct acpi_srat_cpu_affinity *)header;
 231        if (!processor_affinity)
 232                return -EINVAL;
 233
 234        acpi_table_print_srat_entry(header);
 235
 236        /* let architecture-dependent part to do it */
 237        acpi_numa_processor_affinity_init(processor_affinity);
 238
 239        return 0;
 240}
 241
 242static int __initdata parsed_numa_memblks;
 243
 244static int __init
 245acpi_parse_memory_affinity(struct acpi_subtable_header * header,
 246                           const unsigned long end)
 247{
 248        struct acpi_srat_mem_affinity *memory_affinity;
 249
 250        memory_affinity = (struct acpi_srat_mem_affinity *)header;
 251        if (!memory_affinity)
 252                return -EINVAL;
 253
 254        acpi_table_print_srat_entry(header);
 255
 256        /* let architecture-dependent part to do it */
 257        if (!acpi_numa_memory_affinity_init(memory_affinity))
 258                parsed_numa_memblks++;
 259        return 0;
 260}
 261
 262static int __init acpi_parse_srat(struct acpi_table_header *table)
 263{
 264        struct acpi_table_srat *srat;
 265        if (!table)
 266                return -EINVAL;
 267
 268        srat = (struct acpi_table_srat *)table;
 269        acpi_srat_revision = srat->header.revision;
 270
 271        /* Real work done in acpi_table_parse_srat below. */
 272
 273        return 0;
 274}
 275
 276static int __init
 277acpi_table_parse_srat(enum acpi_srat_type id,
 278                      acpi_tbl_entry_handler handler, unsigned int max_entries)
 279{
 280        return acpi_table_parse_entries(ACPI_SIG_SRAT,
 281                                            sizeof(struct acpi_table_srat), id,
 282                                            handler, max_entries);
 283}
 284
 285int __init acpi_numa_init(void)
 286{
 287        int cnt = 0;
 288
 289        /*
 290         * Should not limit number with cpu num that is from NR_CPUS or nr_cpus=
 291         * SRAT cpu entries could have different order with that in MADT.
 292         * So go over all cpu entries in SRAT to get apicid to node mapping.
 293         */
 294
 295        /* SRAT: Static Resource Affinity Table */
 296        if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) {
 297                acpi_table_parse_srat(ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY,
 298                                     acpi_parse_x2apic_affinity, 0);
 299                acpi_table_parse_srat(ACPI_SRAT_TYPE_CPU_AFFINITY,
 300                                     acpi_parse_processor_affinity, 0);
 301                cnt = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
 302                                            acpi_parse_memory_affinity,
 303                                            NR_NODE_MEMBLKS);
 304        }
 305
 306        /* SLIT: System Locality Information Table */
 307        acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit);
 308
 309        acpi_numa_arch_fixup();
 310
 311        if (cnt < 0)
 312                return cnt;
 313        else if (!parsed_numa_memblks)
 314                return -ENOENT;
 315        return 0;
 316}
 317
 318int acpi_get_pxm(acpi_handle h)
 319{
 320        unsigned long long pxm;
 321        acpi_status status;
 322        acpi_handle handle;
 323        acpi_handle phandle = h;
 324
 325        do {
 326                handle = phandle;
 327                status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm);
 328                if (ACPI_SUCCESS(status))
 329                        return pxm;
 330                status = acpi_get_parent(handle, &phandle);
 331        } while (ACPI_SUCCESS(status));
 332        return -1;
 333}
 334
 335int acpi_get_node(acpi_handle *handle)
 336{
 337        int pxm, node = -1;
 338
 339        pxm = acpi_get_pxm(handle);
 340        if (pxm >= 0 && pxm < MAX_PXM_DOMAINS)
 341                node = acpi_map_pxm_to_node(pxm);
 342
 343        return node;
 344}
 345EXPORT_SYMBOL(acpi_get_node);
 346
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