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