drivers/acpi/tables.c

   1 /*
   2  *  acpi_tables.c - ACPI Boot-Time Table Parsing
   3  *
   4  *  Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.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  * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  19  *
  20  */
  21
  22 /* Uncomment next line to get verbose printout */
  23 /* #define DEBUG */
  24 #define pr_fmt(fmt) "ACPI: " fmt
  25
  26 #include <linux/init.h>
  27 #include <linux/kernel.h>
  28 #include <linux/smp.h>
  29 #include <linux/string.h>
  30 #include <linux/types.h>
  31 #include <linux/irq.h>
  32 #include <linux/errno.h>
  33 #include <linux/acpi.h>
  34 #include <linux/bootmem.h>
  35 #include "internal.h"
  36
  37 #define ACPI_MAX_TABLES         128
  38
  39 static char *mps_inti_flags_polarity[] = { "dfl", "high", "res", "low" };
  40 static char *mps_inti_flags_trigger[] = { "dfl", "edge", "res", "level" };
  41
  42 static struct acpi_table_desc initial_tables[ACPI_MAX_TABLES] __initdata;
  43
  44 static int acpi_apic_instance __initdata;
  45
  46 /*
  47  * Disable table checksum verification for the early stage due to the size
  48  * limitation of the current x86 early mapping implementation.
  49  */
  50 static bool acpi_verify_table_checksum __initdata = false;
  51
  52 void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
  53 {
  54         if (!header)
  55                 return;
  56
  57         switch (header->type) {
  58
  59         case ACPI_MADT_TYPE_LOCAL_APIC:
  60                 {
  61                         struct acpi_madt_local_apic *p =
  62                             (struct acpi_madt_local_apic *)header;
  63                         pr_debug("LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n",
  64                                  p->processor_id, p->id,
  65                                  (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
  66                 }
  67                 break;
  68
  69         case ACPI_MADT_TYPE_LOCAL_X2APIC:
  70                 {
  71                         struct acpi_madt_local_x2apic *p =
  72                             (struct acpi_madt_local_x2apic *)header;
  73                         pr_debug("X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n",
  74                                  p->local_apic_id, p->uid,
  75                                  (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
  76                 }
  77                 break;
  78
  79         case ACPI_MADT_TYPE_IO_APIC:
  80                 {
  81                         struct acpi_madt_io_apic *p =
  82                             (struct acpi_madt_io_apic *)header;
  83                         pr_debug("IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n",
  84                                  p->id, p->address, p->global_irq_base);
  85                 }
  86                 break;
  87
  88         case ACPI_MADT_TYPE_INTERRUPT_OVERRIDE:
  89                 {
  90                         struct acpi_madt_interrupt_override *p =
  91                             (struct acpi_madt_interrupt_override *)header;
  92                         pr_info("INT_SRC_OVR (bus %d bus_irq %d global_irq %d %s %s)\n",
  93                                 p->bus, p->source_irq, p->global_irq,
  94                                 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
  95                                 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2]);
  96                         if (p->inti_flags  &
  97                             ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK))
  98                                 pr_info("INT_SRC_OVR unexpected reserved flags: 0x%x\n",
  99                                         p->inti_flags  &
 100                                         ~(ACPI_MADT_POLARITY_MASK | ACPI_MADT_TRIGGER_MASK));
 101                 }
 102                 break;
 103
 104         case ACPI_MADT_TYPE_NMI_SOURCE:
 105                 {
 106                         struct acpi_madt_nmi_source *p =
 107                             (struct acpi_madt_nmi_source *)header;
 108                         pr_info("NMI_SRC (%s %s global_irq %d)\n",
 109                                 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
 110                                 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
 111                                 p->global_irq);
 112                 }
 113                 break;
 114
 115         case ACPI_MADT_TYPE_LOCAL_APIC_NMI:
 116                 {
 117                         struct acpi_madt_local_apic_nmi *p =
 118                             (struct acpi_madt_local_apic_nmi *)header;
 119                         pr_info("LAPIC_NMI (acpi_id[0x%02x] %s %s lint[0x%x])\n",
 120                                 p->processor_id,
 121                                 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK ],
 122                                 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
 123                                 p->lint);
 124                 }
 125                 break;
 126
 127         case ACPI_MADT_TYPE_LOCAL_X2APIC_NMI:
 128                 {
 129                         u16 polarity, trigger;
 130                         struct acpi_madt_local_x2apic_nmi *p =
 131                             (struct acpi_madt_local_x2apic_nmi *)header;
 132
 133                         polarity = p->inti_flags & ACPI_MADT_POLARITY_MASK;
 134                         trigger = (p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2;
 135
 136                         pr_info("X2APIC_NMI (uid[0x%02x] %s %s lint[0x%x])\n",
 137                                 p->uid,
 138                                 mps_inti_flags_polarity[polarity],
 139                                 mps_inti_flags_trigger[trigger],
 140                                 p->lint);
 141                 }
 142                 break;
 143
 144         case ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE:
 145                 {
 146                         struct acpi_madt_local_apic_override *p =
 147                             (struct acpi_madt_local_apic_override *)header;
 148                         pr_info("LAPIC_ADDR_OVR (address[%p])\n",
 149                                 (void *)(unsigned long)p->address);
 150                 }
 151                 break;
 152
 153         case ACPI_MADT_TYPE_IO_SAPIC:
 154                 {
 155                         struct acpi_madt_io_sapic *p =
 156                             (struct acpi_madt_io_sapic *)header;
 157                         pr_debug("IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n",
 158                                  p->id, (void *)(unsigned long)p->address,
 159                                  p->global_irq_base);
 160                 }
 161                 break;
 162
 163         case ACPI_MADT_TYPE_LOCAL_SAPIC:
 164                 {
 165                         struct acpi_madt_local_sapic *p =
 166                             (struct acpi_madt_local_sapic *)header;
 167                         pr_debug("LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n",
 168                                  p->processor_id, p->id, p->eid,
 169                                  (p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
 170                 }
 171                 break;
 172
 173         case ACPI_MADT_TYPE_INTERRUPT_SOURCE:
 174                 {
 175                         struct acpi_madt_interrupt_source *p =
 176                             (struct acpi_madt_interrupt_source *)header;
 177                         pr_info("PLAT_INT_SRC (%s %s type[0x%x] id[0x%04x] eid[0x%x] iosapic_vector[0x%x] global_irq[0x%x]\n",
 178                                 mps_inti_flags_polarity[p->inti_flags & ACPI_MADT_POLARITY_MASK],
 179                                 mps_inti_flags_trigger[(p->inti_flags & ACPI_MADT_TRIGGER_MASK) >> 2],
 180                                 p->type, p->id, p->eid, p->io_sapic_vector,
 181                                 p->global_irq);
 182                 }
 183                 break;
 184
 185         case ACPI_MADT_TYPE_GENERIC_INTERRUPT:
 186                 {
 187                         struct acpi_madt_generic_interrupt *p =
 188                                 (struct acpi_madt_generic_interrupt *)header;
 189                         pr_debug("GICC (acpi_id[0x%04x] address[%llx] MPIDR[0x%llx] %s)\n",
 190                                  p->uid, p->base_address,
 191                                  p->arm_mpidr,
 192                                  (p->flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
 193
 194                 }
 195                 break;
 196
 197         case ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR:
 198                 {
 199                         struct acpi_madt_generic_distributor *p =
 200                                 (struct acpi_madt_generic_distributor *)header;
 201                         pr_debug("GIC Distributor (gic_id[0x%04x] address[%llx] gsi_base[%d])\n",
 202                                  p->gic_id, p->base_address,
 203                                  p->global_irq_base);
 204                 }
 205                 break;
 206
 207         default:
 208                 pr_warn("Found unsupported MADT entry (type = 0x%x)\n",
 209                         header->type);
 210                 break;
 211         }
 212 }
 213
 214 /**
 215  * acpi_parse_entries_array - for each proc_num find a suitable subtable
 216  *
 217  * @id: table id (for debugging purposes)
 218  * @table_size: single entry size
 219  * @table_header: where does the table start?
 220  * @proc: array of acpi_subtable_proc struct containing entry id
 221  *        and associated handler with it
 222  * @proc_num: how big proc is?
 223  * @max_entries: how many entries can we process?
 224  *
 225  * For each proc_num find a subtable with proc->id and run proc->handler
 226  * on it. Assumption is that there's only single handler for particular
 227  * entry id.
 228  *
 229  * On success returns sum of all matching entries for all proc handlers.
 230  * Otherwise, -ENODEV or -EINVAL is returned.
 231  */
 232 static int __init
 233 acpi_parse_entries_array(char *id, unsigned long table_size,
 234                 struct acpi_table_header *table_header,
 235                 struct acpi_subtable_proc *proc, int proc_num,
 236                 unsigned int max_entries)
 237 {
 238         struct acpi_subtable_header *entry;
 239         unsigned long table_end;
 240         int count = 0;
 241         int i;
 242
 243         if (acpi_disabled)
 244                 return -ENODEV;
 245
 246         if (!id)
 247                 return -EINVAL;
 248
 249         if (!table_size)
 250                 return -EINVAL;
 251
 252         if (!table_header) {
 253                 pr_warn("%4.4s not present\n", id);
 254                 return -ENODEV;
 255         }
 256
 257         table_end = (unsigned long)table_header + table_header->length;
 258
 259         /* Parse all entries looking for a match. */
 260
 261         entry = (struct acpi_subtable_header *)
 262             ((unsigned long)table_header + table_size);
 263
 264         while (((unsigned long)entry) + sizeof(struct acpi_subtable_header) <
 265                table_end) {
 266                 if (max_entries && count >= max_entries)
 267                         break;
 268
 269                 for (i = 0; i < proc_num; i++) {
 270                         if (entry->type != proc[i].id)
 271                                 continue;
 272                         if (!proc[i].handler ||
 273                              proc[i].handler(entry, table_end))
 274                                 return -EINVAL;
 275
 276                         proc->count++;
 277                         break;
 278                 }
 279                 if (i != proc_num)
 280                         count++;
 281
 282                 /*
 283                  * If entry->length is 0, break from this loop to avoid
 284                  * infinite loop.
 285                  */
 286                 if (entry->length == 0) {
 287                         pr_err("[%4.4s:0x%02x] Invalid zero length\n", id, proc->id);
 288                         return -EINVAL;
 289                 }
 290
 291                 entry = (struct acpi_subtable_header *)
 292                     ((unsigned long)entry + entry->length);
 293         }
 294
 295         if (max_entries && count > max_entries) {
 296                 pr_warn("[%4.4s:0x%02x] ignored %i entries of %i found\n",
 297                         id, proc->id, count - max_entries, count);
 298         }
 299
 300         return count;
 301 }
 302
 303 int __init
 304 acpi_parse_entries(char *id,
 305                         unsigned long table_size,
 306                         acpi_tbl_entry_handler handler,
 307                         struct acpi_table_header *table_header,
 308                         int entry_id, unsigned int max_entries)
 309 {
 310         struct acpi_subtable_proc proc = {
 311                 .id             = entry_id,
 312                 .handler        = handler,
 313         };
 314
 315         return acpi_parse_entries_array(id, table_size, table_header,
 316                         &proc, 1, max_entries);
 317 }
 318
 319 int __init
 320 acpi_table_parse_entries_array(char *id,
 321                          unsigned long table_size,
 322                          struct acpi_subtable_proc *proc, int proc_num,
 323                          unsigned int max_entries)
 324 {
 325         struct acpi_table_header *table_header = NULL;
 326         acpi_size tbl_size;
 327         int count;
 328         u32 instance = 0;
 329
 330         if (acpi_disabled)
 331                 return -ENODEV;
 332
 333         if (!id)
 334                 return -EINVAL;
 335
 336         if (!strncmp(id, ACPI_SIG_MADT, 4))
 337                 instance = acpi_apic_instance;
 338
 339         acpi_get_table_with_size(id, instance, &table_header, &tbl_size);
 340         if (!table_header) {
 341                 pr_warn("%4.4s not present\n", id);
 342                 return -ENODEV;
 343         }
 344
 345         count = acpi_parse_entries_array(id, table_size, table_header,
 346                         proc, proc_num, max_entries);
 347
 348         early_acpi_os_unmap_memory((char *)table_header, tbl_size);
 349         return count;
 350 }
 351
 352 int __init
 353 acpi_table_parse_entries(char *id,
 354                         unsigned long table_size,
 355                         int entry_id,
 356                         acpi_tbl_entry_handler handler,
 357                         unsigned int max_entries)
 358 {
 359         struct acpi_subtable_proc proc = {
 360                 .id             = entry_id,
 361                 .handler        = handler,
 362         };
 363
 364         return acpi_table_parse_entries_array(id, table_size, &proc, 1,
 365                                                 max_entries);
 366 }
 367
 368 int __init
 369 acpi_table_parse_madt(enum acpi_madt_type id,
 370                       acpi_tbl_entry_handler handler, unsigned int max_entries)
 371 {
 372         return acpi_table_parse_entries(ACPI_SIG_MADT,
 373                                             sizeof(struct acpi_table_madt), id,
 374                                             handler, max_entries);
 375 }
 376
 377 /**
 378  * acpi_table_parse - find table with @id, run @handler on it
 379  * @id: table id to find
 380  * @handler: handler to run
 381  *
 382  * Scan the ACPI System Descriptor Table (STD) for a table matching @id,
 383  * run @handler on it.
 384  *
 385  * Return 0 if table found, -errno if not.
 386  */
 387 int __init acpi_table_parse(char *id, acpi_tbl_table_handler handler)
 388 {
 389         struct acpi_table_header *table = NULL;
 390         acpi_size tbl_size;
 391
 392         if (acpi_disabled)
 393                 return -ENODEV;
 394
 395         if (!id || !handler)
 396                 return -EINVAL;
 397
 398         if (strncmp(id, ACPI_SIG_MADT, 4) == 0)
 399                 acpi_get_table_with_size(id, acpi_apic_instance, &table, &tbl_size);
 400         else
 401                 acpi_get_table_with_size(id, 0, &table, &tbl_size);
 402
 403         if (table) {
 404                 handler(table);
 405                 early_acpi_os_unmap_memory(table, tbl_size);
 406                 return 0;
 407         } else
 408                 return -ENODEV;
 409 }
 410
 411 /*
 412  * The BIOS is supposed to supply a single APIC/MADT,
 413  * but some report two.  Provide a knob to use either.
 414  * (don't you wish instance 0 and 1 were not the same?)
 415  */
 416 static void __init check_multiple_madt(void)
 417 {
 418         struct acpi_table_header *table = NULL;
 419         acpi_size tbl_size;
 420
 421         acpi_get_table_with_size(ACPI_SIG_MADT, 2, &table, &tbl_size);
 422         if (table) {
 423                 pr_warn("BIOS bug: multiple APIC/MADT found, using %d\n",
 424                         acpi_apic_instance);
 425                 pr_warn("If \"acpi_apic_instance=%d\" works better, "
 426                         "notify linux-acpi@vger.kernel.org\n",
 427                         acpi_apic_instance ? 0 : 2);
 428                 early_acpi_os_unmap_memory(table, tbl_size);
 429
 430         } else
 431                 acpi_apic_instance = 0;
 432
 433         return;
 434 }
 435
 436 /*
 437  * acpi_table_init()
 438  *
 439  * find RSDP, find and checksum SDT/XSDT.
 440  * checksum all tables, print SDT/XSDT
 441  *
 442  * result: sdt_entry[] is initialized
 443  */
 444
 445 int __init acpi_table_init(void)
 446 {
 447         acpi_status status;
 448
 449         if (acpi_verify_table_checksum) {
 450                 pr_info("Early table checksum verification enabled\n");
 451                 acpi_gbl_verify_table_checksum = TRUE;
 452         } else {
 453                 pr_info("Early table checksum verification disabled\n");
 454                 acpi_gbl_verify_table_checksum = FALSE;
 455         }
 456
 457         status = acpi_initialize_tables(initial_tables, ACPI_MAX_TABLES, 0);
 458         if (ACPI_FAILURE(status))
 459                 return -EINVAL;
 460         acpi_initrd_initialize_tables();
 461
 462         check_multiple_madt();
 463         return 0;
 464 }
 465
 466 static int __init acpi_parse_apic_instance(char *str)
 467 {
 468         if (!str)
 469                 return -EINVAL;
 470
 471         if (kstrtoint(str, 0, &acpi_apic_instance))
 472                 return -EINVAL;
 473
 474         pr_notice("Shall use APIC/MADT table %d\n", acpi_apic_instance);
 475
 476         return 0;
 477 }
 478
 479 early_param("acpi_apic_instance", acpi_parse_apic_instance);
 480
 481 static int __init acpi_force_table_verification_setup(char *s)
 482 {
 483         acpi_verify_table_checksum = true;
 484
 485         return 0;
 486 }
 487
 488 early_param("acpi_force_table_verification", acpi_force_table_verification_setup);
 489
 490 static int __init acpi_force_32bit_fadt_addr(char *s)
 491 {
 492         pr_info("Forcing 32 Bit FADT addresses\n");
 493         acpi_gbl_use32_bit_fadt_addresses = TRUE;
 494
 495         return 0;
 496 }
 497
 498 early_param("acpi_force_32bit_fadt_addr", acpi_force_32bit_fadt_addr);