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