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