LXR linux/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
  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\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 */
 160static __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
 177static 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
 195void __init __attribute__ ((weak))
 196acpi_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
 204static int __init
 205acpi_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
 222static int __init
 223acpi_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
 240static int __initdata parsed_numa_memblks;
 241
 242static int __init
 243acpi_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
 260static 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
 274static int __init
 275acpi_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
 283int __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
 316int 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
 333int 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}
 343EXPORT_SYMBOL(acpi_get_node);
 344