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
  33 #define PREFIX "ACPI: "
  34
  35 #define ACPI_NUMA       0x80000000
  36 #define _COMPONENT      ACPI_NUMA
  37 ACPI_MODULE_NAME("numa");
  38
  39 static nodemask_t nodes_found_map = NODE_MASK_NONE;
  40
  41 /* maps to convert between proximity domain and logical node ID */
  42 static int pxm_to_node_map[MAX_PXM_DOMAINS]
  43                         = { [0 ... MAX_PXM_DOMAINS - 1] = NUMA_NO_NODE };
  44 static int node_to_pxm_map[MAX_NUMNODES]
  45                         = { [0 ... MAX_NUMNODES - 1] = PXM_INVAL };
  46
  47 unsigned char acpi_srat_revision __initdata;
  48
  49 int pxm_to_node(int pxm)
  50 {
  51         if (pxm < 0)
  52                 return NUMA_NO_NODE;
  53         return pxm_to_node_map[pxm];
  54 }
  55
  56 int node_to_pxm(int node)
  57 {
  58         if (node < 0)
  59                 return PXM_INVAL;
  60         return node_to_pxm_map[node];
  61 }
  62
  63 static void __acpi_map_pxm_to_node(int pxm, int node)
  64 {
  65         if (pxm_to_node_map[pxm] == NUMA_NO_NODE || node < pxm_to_node_map[pxm])
  66                 pxm_to_node_map[pxm] = node;
  67         if (node_to_pxm_map[node] == PXM_INVAL || pxm < node_to_pxm_map[node])
  68                 node_to_pxm_map[node] = pxm;
  69 }
  70
  71 int acpi_map_pxm_to_node(int pxm)
  72 {
  73         int node = pxm_to_node_map[pxm];
  74
  75         if (node == NUMA_NO_NODE) {
  76                 if (nodes_weight(nodes_found_map) >= MAX_NUMNODES)
  77                         return NUMA_NO_NODE;
  78                 node = first_unset_node(nodes_found_map);
  79                 __acpi_map_pxm_to_node(pxm, node);
  80                 node_set(node, nodes_found_map);
  81         }
  82
  83         return node;
  84 }
  85
  86 static void __init
  87 acpi_table_print_srat_entry(struct acpi_subtable_header *header)
  88 {
  89
  90         ACPI_FUNCTION_NAME("acpi_table_print_srat_entry");
  91
  92         if (!header)
  93                 return;
  94
  95         switch (header->type) {
  96
  97         case ACPI_SRAT_TYPE_CPU_AFFINITY:
  98 #ifdef ACPI_DEBUG_OUTPUT
  99                 {
 100                         struct acpi_srat_cpu_affinity *p =
 101                             (struct acpi_srat_cpu_affinity *)header;
 102                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 103                                           "SRAT Processor (id[0x%02x] eid[0x%02x]) in proximity domain %d %s\n",
 104                                           p->apic_id, p->local_sapic_eid,
 105                                           p->proximity_domain_lo,
 106                                           (p->flags & ACPI_SRAT_CPU_ENABLED)?
 107                                           "enabled" : "disabled"));
 108                 }
 109 #endif                          /* ACPI_DEBUG_OUTPUT */
 110                 break;
 111
 112         case ACPI_SRAT_TYPE_MEMORY_AFFINITY:
 113 #ifdef ACPI_DEBUG_OUTPUT
 114                 {
 115                         struct acpi_srat_mem_affinity *p =
 116                             (struct acpi_srat_mem_affinity *)header;
 117                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 118                                           "SRAT Memory (0x%lx length 0x%lx) in proximity domain %d %s%s%s\n",
 119                                           (unsigned long)p->base_address,
 120                                           (unsigned long)p->length,
 121                                           p->proximity_domain,
 122                                           (p->flags & ACPI_SRAT_MEM_ENABLED)?
 123                                           "enabled" : "disabled",
 124                                           (p->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE)?
 125                                           " hot-pluggable" : "",
 126                                           (p->flags & ACPI_SRAT_MEM_NON_VOLATILE)?
 127                                           " non-volatile" : ""));
 128                 }
 129 #endif                          /* ACPI_DEBUG_OUTPUT */
 130                 break;
 131
 132         case ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY:
 133 #ifdef ACPI_DEBUG_OUTPUT
 134                 {
 135                         struct acpi_srat_x2apic_cpu_affinity *p =
 136                             (struct acpi_srat_x2apic_cpu_affinity *)header;
 137                         ACPI_DEBUG_PRINT((ACPI_DB_INFO,
 138                                           "SRAT Processor (x2apicid[0x%08x]) in"
 139                                           " proximity domain %d %s\n",
 140                                           p->apic_id,
 141                                           p->proximity_domain,
 142                                           (p->flags & ACPI_SRAT_CPU_ENABLED) ?
 143                                           "enabled" : "disabled"));
 144                 }
 145 #endif                          /* ACPI_DEBUG_OUTPUT */
 146                 break;
 147         default:
 148                 printk(KERN_WARNING PREFIX
 149                        "Found unsupported SRAT entry (type = 0x%x)\n",
 150                        header->type);
 151                 break;
 152         }
 153 }
 154
 155 /*
 156  * A lot of BIOS fill in 10 (= no distance) everywhere. This messes
 157  * up the NUMA heuristics which wants the local node to have a smaller
 158  * distance than the others.
 159  * Do some quick checks here and only use the SLIT if it passes.
 160  */
 161 static int __init slit_valid(struct acpi_table_slit *slit)
 162 {
 163         int i, j;
 164         int d = slit->locality_count;
 165         for (i = 0; i < d; i++) {
 166                 for (j = 0; j < d; j++)  {
 167                         u8 val = slit->entry[d*i + j];
 168                         if (i == j) {
 169                                 if (val != LOCAL_DISTANCE)
 170                                         return 0;
 171                         } else if (val <= LOCAL_DISTANCE)
 172                                 return 0;
 173                 }
 174         }
 175         return 1;
 176 }
 177
 178 static int __init acpi_parse_slit(struct acpi_table_header *table)
 179 {
 180         struct acpi_table_slit *slit;
 181
 182         if (!table)
 183                 return -EINVAL;
 184
 185         slit = (struct acpi_table_slit *)table;
 186
 187         if (!slit_valid(slit)) {
 188                 printk(KERN_INFO "ACPI: SLIT table looks invalid. Not used.\n");
 189                 return -EINVAL;
 190         }
 191         acpi_numa_slit_init(slit);
 192
 193         return 0;
 194 }
 195
 196 void __init __weak
 197 acpi_numa_x2apic_affinity_init(struct acpi_srat_x2apic_cpu_affinity *pa)
 198 {
 199         printk(KERN_WARNING PREFIX
 200                "Found unsupported x2apic [0x%08x] SRAT entry\n", pa->apic_id);
 201         return;
 202 }
 203
 204
 205 static int __init
 206 acpi_parse_x2apic_affinity(struct acpi_subtable_header *header,
 207                            const unsigned long end)
 208 {
 209         struct acpi_srat_x2apic_cpu_affinity *processor_affinity;
 210
 211         processor_affinity = (struct acpi_srat_x2apic_cpu_affinity *)header;
 212         if (!processor_affinity)
 213                 return -EINVAL;
 214
 215         acpi_table_print_srat_entry(header);
 216
 217         /* let architecture-dependent part to do it */
 218         acpi_numa_x2apic_affinity_init(processor_affinity);
 219
 220         return 0;
 221 }
 222
 223 static int __init
 224 acpi_parse_processor_affinity(struct acpi_subtable_header *header,
 225                               const unsigned long end)
 226 {
 227         struct acpi_srat_cpu_affinity *processor_affinity;
 228
 229         processor_affinity = (struct acpi_srat_cpu_affinity *)header;
 230         if (!processor_affinity)
 231                 return -EINVAL;
 232
 233         acpi_table_print_srat_entry(header);
 234
 235         /* let architecture-dependent part to do it */
 236         acpi_numa_processor_affinity_init(processor_affinity);
 237
 238         return 0;
 239 }
 240
 241 static int __initdata parsed_numa_memblks;
 242
 243 static int __init
 244 acpi_parse_memory_affinity(struct acpi_subtable_header * header,
 245                            const unsigned long end)
 246 {
 247         struct acpi_srat_mem_affinity *memory_affinity;
 248
 249         memory_affinity = (struct acpi_srat_mem_affinity *)header;
 250         if (!memory_affinity)
 251                 return -EINVAL;
 252
 253         acpi_table_print_srat_entry(header);
 254
 255         /* let architecture-dependent part to do it */
 256         if (!acpi_numa_memory_affinity_init(memory_affinity))
 257                 parsed_numa_memblks++;
 258         return 0;
 259 }
 260
 261 static int __init acpi_parse_srat(struct acpi_table_header *table)
 262 {
 263         struct acpi_table_srat *srat;
 264         if (!table)
 265                 return -EINVAL;
 266
 267         srat = (struct acpi_table_srat *)table;
 268         acpi_srat_revision = srat->header.revision;
 269
 270         /* Real work done in acpi_table_parse_srat below. */
 271
 272         return 0;
 273 }
 274
 275 static int __init
 276 acpi_table_parse_srat(enum acpi_srat_type id,
 277                       acpi_tbl_entry_handler handler, unsigned int max_entries)
 278 {
 279         return acpi_table_parse_entries(ACPI_SIG_SRAT,
 280                                             sizeof(struct acpi_table_srat), id,
 281                                             handler, max_entries);
 282 }
 283
 284 int __init acpi_numa_init(void)
 285 {
 286         int cnt = 0;
 287
 288         /*
 289          * Should not limit number with cpu num that is from NR_CPUS or nr_cpus=
 290          * SRAT cpu entries could have different order with that in MADT.
 291          * So go over all cpu entries in SRAT to get apicid to node mapping.
 292          */
 293
 294         /* SRAT: Static Resource Affinity Table */
 295         if (!acpi_table_parse(ACPI_SIG_SRAT, acpi_parse_srat)) {
 296                 acpi_table_parse_srat(ACPI_SRAT_TYPE_X2APIC_CPU_AFFINITY,
 297                                      acpi_parse_x2apic_affinity, 0);
 298                 acpi_table_parse_srat(ACPI_SRAT_TYPE_CPU_AFFINITY,
 299                                      acpi_parse_processor_affinity, 0);
 300                 cnt = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY,
 301                                             acpi_parse_memory_affinity,
 302                                             NR_NODE_MEMBLKS);
 303         }
 304
 305         /* SLIT: System Locality Information Table */
 306         acpi_table_parse(ACPI_SIG_SLIT, acpi_parse_slit);
 307
 308         acpi_numa_arch_fixup();
 309
 310         if (cnt < 0)
 311                 return cnt;
 312         else if (!parsed_numa_memblks)
 313                 return -ENOENT;
 314         return 0;
 315 }
 316
 317 static int acpi_get_pxm(acpi_handle h)
 318 {
 319         unsigned long long pxm;
 320         acpi_status status;
 321         acpi_handle handle;
 322         acpi_handle phandle = h;
 323
 324         do {
 325                 handle = phandle;
 326                 status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm);
 327                 if (ACPI_SUCCESS(status))
 328                         return pxm;
 329                 status = acpi_get_parent(handle, &phandle);
 330         } while (ACPI_SUCCESS(status));
 331         return -1;
 332 }
 333
 334 int acpi_get_node(acpi_handle handle)
 335 {
 336         int pxm;
 337
 338         pxm = acpi_get_pxm(handle);
 339         if (pxm < 0 || pxm >= MAX_PXM_DOMAINS)
 340                 return NUMA_NO_NODE;
 341
 342         return acpi_map_pxm_to_node(pxm);
 343 }
 344 EXPORT_SYMBOL(acpi_get_node);