kernel/drivers/acpi/acpica/tbinstal.c

   1 /******************************************************************************
   2  *
   3  * Module Name: tbinstal - ACPI table installation and removal
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2015, Intel Corp.
   9  * All rights reserved.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions, and the following disclaimer,
  16  *    without modification.
  17  * 2. Redistributions in binary form must reproduce at minimum a disclaimer
  18  *    substantially similar to the "NO WARRANTY" disclaimer below
  19  *    ("Disclaimer") and any redistribution must be conditioned upon
  20  *    including a substantially similar Disclaimer requirement for further
  21  *    binary redistribution.
  22  * 3. Neither the names of the above-listed copyright holders nor the names
  23  *    of any contributors may be used to endorse or promote products derived
  24  *    from this software without specific prior written permission.
  25  *
  26  * Alternatively, this software may be distributed under the terms of the
  27  * GNU General Public License ("GPL") version 2 as published by the Free
  28  * Software Foundation.
  29  *
  30  * NO WARRANTY
  31  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  32  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  33  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
  34  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  35  * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  39  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
  40  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  41  * POSSIBILITY OF SUCH DAMAGES.
  42  */
  43
  44 #include <acpi/acpi.h>
  45 #include "accommon.h"
  46 #include "actables.h"
  47
  48 #define _COMPONENT          ACPI_TABLES
  49 ACPI_MODULE_NAME("tbinstal")
  50
  51 /* Local prototypes */
  52 static u8
  53 acpi_tb_compare_tables(struct acpi_table_desc *table_desc, u32 table_index);
  54
  55 /*******************************************************************************
  56  *
  57  * FUNCTION:    acpi_tb_compare_tables
  58  *
  59  * PARAMETERS:  table_desc          - Table 1 descriptor to be compared
  60  *              table_index         - Index of table 2 to be compared
  61  *
  62  * RETURN:      TRUE if both tables are identical.
  63  *
  64  * DESCRIPTION: This function compares a table with another table that has
  65  *              already been installed in the root table list.
  66  *
  67  ******************************************************************************/
  68
  69 static u8
  70 acpi_tb_compare_tables(struct acpi_table_desc *table_desc, u32 table_index)
  71 {
  72         acpi_status status = AE_OK;
  73         u8 is_identical;
  74         struct acpi_table_header *table;
  75         u32 table_length;
  76         u8 table_flags;
  77
  78         status =
  79             acpi_tb_acquire_table(&acpi_gbl_root_table_list.tables[table_index],
  80                                   &table, &table_length, &table_flags);
  81         if (ACPI_FAILURE(status)) {
  82                 return (FALSE);
  83         }
  84
  85         /*
  86          * Check for a table match on the entire table length,
  87          * not just the header.
  88          */
  89         is_identical = (u8)((table_desc->length != table_length ||
  90                              memcmp(table_desc->pointer, table, table_length)) ?
  91                             FALSE : TRUE);
  92
  93         /* Release the acquired table */
  94
  95         acpi_tb_release_table(table, table_length, table_flags);
  96         return (is_identical);
  97 }
  98
  99 /*******************************************************************************
 100  *
 101  * FUNCTION:    acpi_tb_install_table_with_override
 102  *
 103  * PARAMETERS:  new_table_desc          - New table descriptor to install
 104  *              override                - Whether override should be performed
 105  *              table_index             - Where the table index is returned
 106  *
 107  * RETURN:      None
 108  *
 109  * DESCRIPTION: Install an ACPI table into the global data structure. The
 110  *              table override mechanism is called to allow the host
 111  *              OS to replace any table before it is installed in the root
 112  *              table array.
 113  *
 114  ******************************************************************************/
 115
 116 void
 117 acpi_tb_install_table_with_override(struct acpi_table_desc *new_table_desc,
 118                                     u8 override, u32 *table_index)
 119 {
 120         u32 i;
 121         acpi_status status;
 122
 123         status = acpi_tb_get_next_table_descriptor(&i, NULL);
 124         if (ACPI_FAILURE(status)) {
 125                 return;
 126         }
 127
 128         /*
 129          * ACPI Table Override:
 130          *
 131          * Before we install the table, let the host OS override it with a new
 132          * one if desired. Any table within the RSDT/XSDT can be replaced,
 133          * including the DSDT which is pointed to by the FADT.
 134          */
 135         if (override) {
 136                 acpi_tb_override_table(new_table_desc);
 137         }
 138
 139         acpi_tb_init_table_descriptor(&acpi_gbl_root_table_list.tables[i],
 140                                       new_table_desc->address,
 141                                       new_table_desc->flags,
 142                                       new_table_desc->pointer);
 143
 144         acpi_tb_print_table_header(new_table_desc->address,
 145                                    new_table_desc->pointer);
 146
 147         /* This synchronizes acpi_gbl_dsdt_index */
 148
 149         *table_index = i;
 150
 151         /* Set the global integer width (based upon revision of the DSDT) */
 152
 153         if (i == acpi_gbl_dsdt_index) {
 154                 acpi_ut_set_integer_width(new_table_desc->pointer->revision);
 155         }
 156 }
 157
 158 /*******************************************************************************
 159  *
 160  * FUNCTION:    acpi_tb_install_fixed_table
 161  *
 162  * PARAMETERS:  address                 - Physical address of DSDT or FACS
 163  *              signature               - Table signature, NULL if no need to
 164  *                                        match
 165  *              table_index             - Where the table index is returned
 166  *
 167  * RETURN:      Status
 168  *
 169  * DESCRIPTION: Install a fixed ACPI table (DSDT/FACS) into the global data
 170  *              structure.
 171  *
 172  ******************************************************************************/
 173
 174 acpi_status
 175 acpi_tb_install_fixed_table(acpi_physical_address address,
 176                             char *signature, u32 *table_index)
 177 {
 178         struct acpi_table_desc new_table_desc;
 179         acpi_status status;
 180
 181         ACPI_FUNCTION_TRACE(tb_install_fixed_table);
 182
 183         if (!address) {
 184                 ACPI_ERROR((AE_INFO,
 185                             "Null physical address for ACPI table [%s]",
 186                             signature));
 187                 return (AE_NO_MEMORY);
 188         }
 189
 190         /* Fill a table descriptor for validation */
 191
 192         status = acpi_tb_acquire_temp_table(&new_table_desc, address,
 193                                             ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL);
 194         if (ACPI_FAILURE(status)) {
 195                 ACPI_ERROR((AE_INFO,
 196                             "Could not acquire table length at %8.8X%8.8X",
 197                             ACPI_FORMAT_UINT64(address)));
 198                 return_ACPI_STATUS(status);
 199         }
 200
 201         /* Validate and verify a table before installation */
 202
 203         status = acpi_tb_verify_temp_table(&new_table_desc, signature);
 204         if (ACPI_FAILURE(status)) {
 205                 goto release_and_exit;
 206         }
 207
 208         /* Add the table to the global root table list */
 209
 210         acpi_tb_install_table_with_override(&new_table_desc, TRUE, table_index);
 211
 212 release_and_exit:
 213
 214         /* Release the temporary table descriptor */
 215
 216         acpi_tb_release_temp_table(&new_table_desc);
 217         return_ACPI_STATUS(status);
 218 }
 219
 220 /*******************************************************************************
 221  *
 222  * FUNCTION:    acpi_tb_install_standard_table
 223  *
 224  * PARAMETERS:  address             - Address of the table (might be a virtual
 225  *                                    address depending on the table_flags)
 226  *              flags               - Flags for the table
 227  *              reload              - Whether reload should be performed
 228  *              override            - Whether override should be performed
 229  *              table_index         - Where the table index is returned
 230  *
 231  * RETURN:      Status
 232  *
 233  * DESCRIPTION: This function is called to install an ACPI table that is
 234  *              neither DSDT nor FACS (a "standard" table.)
 235  *              When this function is called by "Load" or "LoadTable" opcodes,
 236  *              or by acpi_load_table() API, the "Reload" parameter is set.
 237  *              After sucessfully returning from this function, table is
 238  *              "INSTALLED" but not "VALIDATED".
 239  *
 240  ******************************************************************************/
 241
 242 acpi_status
 243 acpi_tb_install_standard_table(acpi_physical_address address,
 244                                u8 flags,
 245                                u8 reload, u8 override, u32 *table_index)
 246 {
 247         u32 i;
 248         acpi_status status = AE_OK;
 249         struct acpi_table_desc new_table_desc;
 250
 251         ACPI_FUNCTION_TRACE(tb_install_standard_table);
 252
 253         /* Acquire a temporary table descriptor for validation */
 254
 255         status = acpi_tb_acquire_temp_table(&new_table_desc, address, flags);
 256         if (ACPI_FAILURE(status)) {
 257                 ACPI_ERROR((AE_INFO,
 258                             "Could not acquire table length at %8.8X%8.8X",
 259                             ACPI_FORMAT_UINT64(address)));
 260                 return_ACPI_STATUS(status);
 261         }
 262
 263         /*
 264          * Optionally do not load any SSDTs from the RSDT/XSDT. This can
 265          * be useful for debugging ACPI problems on some machines.
 266          */
 267         if (!reload &&
 268             acpi_gbl_disable_ssdt_table_install &&
 269             ACPI_COMPARE_NAME(&new_table_desc.signature, ACPI_SIG_SSDT)) {
 270                 ACPI_INFO((AE_INFO,
 271                            "Ignoring installation of %4.4s at %8.8X%8.8X",
 272                            new_table_desc.signature.ascii,
 273                            ACPI_FORMAT_UINT64(address)));
 274                 goto release_and_exit;
 275         }
 276
 277         /* Validate and verify a table before installation */
 278
 279         status = acpi_tb_verify_temp_table(&new_table_desc, NULL);
 280         if (ACPI_FAILURE(status)) {
 281                 goto release_and_exit;
 282         }
 283
 284         if (reload) {
 285                 /*
 286                  * Validate the incoming table signature.
 287                  *
 288                  * 1) Originally, we checked the table signature for "SSDT" or "PSDT".
 289                  * 2) We added support for OEMx tables, signature "OEM".
 290                  * 3) Valid tables were encountered with a null signature, so we just
 291                  *    gave up on validating the signature, (05/2008).
 292                  * 4) We encountered non-AML tables such as the MADT, which caused
 293                  *    interpreter errors and kernel faults. So now, we once again allow
 294                  *    only "SSDT", "OEMx", and now, also a null signature. (05/2011).
 295                  */
 296                 if ((new_table_desc.signature.ascii[0] != 0x00) &&
 297                     (!ACPI_COMPARE_NAME
 298                      (&new_table_desc.signature, ACPI_SIG_SSDT))
 299                     && (strncmp(new_table_desc.signature.ascii, "OEM", 3))) {
 300                         ACPI_BIOS_ERROR((AE_INFO,
 301                                          "Table has invalid signature [%4.4s] (0x%8.8X), "
 302                                          "must be SSDT or OEMx",
 303                                          acpi_ut_valid_acpi_name(new_table_desc.
 304                                                                  signature.
 305                                                                  ascii) ?
 306                                          new_table_desc.signature.
 307                                          ascii : "????",
 308                                          new_table_desc.signature.integer));
 309
 310                         status = AE_BAD_SIGNATURE;
 311                         goto release_and_exit;
 312                 }
 313
 314                 /* Check if table is already registered */
 315
 316                 for (i = 0; i < acpi_gbl_root_table_list.current_table_count;
 317                      ++i) {
 318                         /*
 319                          * Check for a table match on the entire table length,
 320                          * not just the header.
 321                          */
 322                         if (!acpi_tb_compare_tables(&new_table_desc, i)) {
 323                                 continue;
 324                         }
 325
 326                         /*
 327                          * Note: the current mechanism does not unregister a table if it is
 328                          * dynamically unloaded. The related namespace entries are deleted,
 329                          * but the table remains in the root table list.
 330                          *
 331                          * The assumption here is that the number of different tables that
 332                          * will be loaded is actually small, and there is minimal overhead
 333                          * in just keeping the table in case it is needed again.
 334                          *
 335                          * If this assumption changes in the future (perhaps on large
 336                          * machines with many table load/unload operations), tables will
 337                          * need to be unregistered when they are unloaded, and slots in the
 338                          * root table list should be reused when empty.
 339                          */
 340                         if (acpi_gbl_root_table_list.tables[i].
 341                             flags & ACPI_TABLE_IS_LOADED) {
 342
 343                                 /* Table is still loaded, this is an error */
 344
 345                                 status = AE_ALREADY_EXISTS;
 346                                 goto release_and_exit;
 347                         } else {
 348                                 /*
 349                                  * Table was unloaded, allow it to be reloaded.
 350                                  * As we are going to return AE_OK to the caller, we should
 351                                  * take the responsibility of freeing the input descriptor.
 352                                  * Refill the input descriptor to ensure
 353                                  * acpi_tb_install_table_with_override() can be called again to
 354                                  * indicate the re-installation.
 355                                  */
 356                                 acpi_tb_uninstall_table(&new_table_desc);
 357                                 *table_index = i;
 358                                 return_ACPI_STATUS(AE_OK);
 359                         }
 360                 }
 361         }
 362
 363         /* Add the table to the global root table list */
 364
 365         acpi_tb_install_table_with_override(&new_table_desc, override,
 366                                             table_index);
 367
 368 release_and_exit:
 369
 370         /* Release the temporary table descriptor */
 371
 372         acpi_tb_release_temp_table(&new_table_desc);
 373         return_ACPI_STATUS(status);
 374 }
 375
 376 /*******************************************************************************
 377  *
 378  * FUNCTION:    acpi_tb_override_table
 379  *
 380  * PARAMETERS:  old_table_desc      - Validated table descriptor to be
 381  *                                    overridden
 382  *
 383  * RETURN:      None
 384  *
 385  * DESCRIPTION: Attempt table override by calling the OSL override functions.
 386  *              Note: If the table is overridden, then the entire new table
 387  *              is acquired and returned by this function.
 388  *              Before/after invocation, the table descriptor is in a state
 389  *              that is "VALIDATED".
 390  *
 391  ******************************************************************************/
 392
 393 void acpi_tb_override_table(struct acpi_table_desc *old_table_desc)
 394 {
 395         acpi_status status;
 396         char *override_type;
 397         struct acpi_table_desc new_table_desc;
 398         struct acpi_table_header *table;
 399         acpi_physical_address address;
 400         u32 length;
 401
 402         /* (1) Attempt logical override (returns a logical address) */
 403
 404         status = acpi_os_table_override(old_table_desc->pointer, &table);
 405         if (ACPI_SUCCESS(status) && table) {
 406                 acpi_tb_acquire_temp_table(&new_table_desc,
 407                                            ACPI_PTR_TO_PHYSADDR(table),
 408                                            ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL);
 409                 override_type = "Logical";
 410                 goto finish_override;
 411         }
 412
 413         /* (2) Attempt physical override (returns a physical address) */
 414
 415         status = acpi_os_physical_table_override(old_table_desc->pointer,
 416                                                  &address, &length);
 417         if (ACPI_SUCCESS(status) && address && length) {
 418                 acpi_tb_acquire_temp_table(&new_table_desc, address,
 419                                            ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL);
 420                 override_type = "Physical";
 421                 goto finish_override;
 422         }
 423
 424         return;                 /* There was no override */
 425
 426 finish_override:
 427
 428         /* Validate and verify a table before overriding */
 429
 430         status = acpi_tb_verify_temp_table(&new_table_desc, NULL);
 431         if (ACPI_FAILURE(status)) {
 432                 return;
 433         }
 434
 435         ACPI_INFO((AE_INFO, "%4.4s 0x%8.8X%8.8X"
 436                    " %s table override, new table: 0x%8.8X%8.8X",
 437                    old_table_desc->signature.ascii,
 438                    ACPI_FORMAT_UINT64(old_table_desc->address),
 439                    override_type, ACPI_FORMAT_UINT64(new_table_desc.address)));
 440
 441         /* We can now uninstall the original table */
 442
 443         acpi_tb_uninstall_table(old_table_desc);
 444
 445         /*
 446          * Replace the original table descriptor and keep its state as
 447          * "VALIDATED".
 448          */
 449         acpi_tb_init_table_descriptor(old_table_desc, new_table_desc.address,
 450                                       new_table_desc.flags,
 451                                       new_table_desc.pointer);
 452         acpi_tb_validate_temp_table(old_table_desc);
 453
 454         /* Release the temporary table descriptor */
 455
 456         acpi_tb_release_temp_table(&new_table_desc);
 457 }
 458
 459 /*******************************************************************************
 460  *
 461  * FUNCTION:    acpi_tb_uninstall_table
 462  *
 463  * PARAMETERS:  table_desc          - Table descriptor
 464  *
 465  * RETURN:      None
 466  *
 467  * DESCRIPTION: Delete one internal ACPI table
 468  *
 469  ******************************************************************************/
 470
 471 void acpi_tb_uninstall_table(struct acpi_table_desc *table_desc)
 472 {
 473
 474         ACPI_FUNCTION_TRACE(tb_uninstall_table);
 475
 476         /* Table must be installed */
 477
 478         if (!table_desc->address) {
 479                 return_VOID;
 480         }
 481
 482         acpi_tb_invalidate_table(table_desc);
 483
 484         if ((table_desc->flags & ACPI_TABLE_ORIGIN_MASK) ==
 485             ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL) {
 486                 ACPI_FREE(ACPI_PHYSADDR_TO_PTR(table_desc->address));
 487         }
 488
 489         table_desc->address = ACPI_PTR_TO_PHYSADDR(NULL);
 490         return_VOID;
 491 }