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                              ACPI_MEMCMP(table_desc->pointer, table,
  91                                          table_length)) ? 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:  table_index             - Index into root table array
 104  *              new_table_desc          - New table descriptor to install
 105  *              override                - Whether override should be performed
 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(u32 table_index,
 118                                     struct acpi_table_desc *new_table_desc,
 119                                     u8 override)
 120 {
 121
 122         if (table_index >= acpi_gbl_root_table_list.current_table_count) {
 123                 return;
 124         }
 125
 126         /*
 127          * ACPI Table Override:
 128          *
 129          * Before we install the table, let the host OS override it with a new
 130          * one if desired. Any table within the RSDT/XSDT can be replaced,
 131          * including the DSDT which is pointed to by the FADT.
 132          */
 133         if (override) {
 134                 acpi_tb_override_table(new_table_desc);
 135         }
 136
 137         acpi_tb_init_table_descriptor(&acpi_gbl_root_table_list.
 138                                       tables[table_index],
 139                                       new_table_desc->address,
 140                                       new_table_desc->flags,
 141                                       new_table_desc->pointer);
 142
 143         acpi_tb_print_table_header(new_table_desc->address,
 144                                    new_table_desc->pointer);
 145
 146         /* Set the global integer width (based upon revision of the DSDT) */
 147
 148         if (table_index == ACPI_TABLE_INDEX_DSDT) {
 149                 acpi_ut_set_integer_width(new_table_desc->pointer->revision);
 150         }
 151 }
 152
 153 /*******************************************************************************
 154  *
 155  * FUNCTION:    acpi_tb_install_fixed_table
 156  *
 157  * PARAMETERS:  address                 - Physical address of DSDT or FACS
 158  *              signature               - Table signature, NULL if no need to
 159  *                                        match
 160  *              table_index             - Index into root table array
 161  *
 162  * RETURN:      Status
 163  *
 164  * DESCRIPTION: Install a fixed ACPI table (DSDT/FACS) into the global data
 165  *              structure.
 166  *
 167  ******************************************************************************/
 168
 169 acpi_status
 170 acpi_tb_install_fixed_table(acpi_physical_address address,
 171                             char *signature, u32 table_index)
 172 {
 173         struct acpi_table_desc new_table_desc;
 174         acpi_status status;
 175
 176         ACPI_FUNCTION_TRACE(tb_install_fixed_table);
 177
 178         if (!address) {
 179                 ACPI_ERROR((AE_INFO,
 180                             "Null physical address for ACPI table [%s]",
 181                             signature));
 182                 return (AE_NO_MEMORY);
 183         }
 184
 185         /* Fill a table descriptor for validation */
 186
 187         status = acpi_tb_acquire_temp_table(&new_table_desc, address,
 188                                             ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL);
 189         if (ACPI_FAILURE(status)) {
 190                 ACPI_ERROR((AE_INFO,
 191                             "Could not acquire table length at %8.8X%8.8X",
 192                             ACPI_FORMAT_UINT64(address)));
 193                 return_ACPI_STATUS(status);
 194         }
 195
 196         /* Validate and verify a table before installation */
 197
 198         status = acpi_tb_verify_temp_table(&new_table_desc, signature);
 199         if (ACPI_FAILURE(status)) {
 200                 goto release_and_exit;
 201         }
 202
 203         acpi_tb_install_table_with_override(table_index, &new_table_desc, TRUE);
 204
 205 release_and_exit:
 206
 207         /* Release the temporary table descriptor */
 208
 209         acpi_tb_release_temp_table(&new_table_desc);
 210         return_ACPI_STATUS(status);
 211 }
 212
 213 /*******************************************************************************
 214  *
 215  * FUNCTION:    acpi_tb_install_standard_table
 216  *
 217  * PARAMETERS:  address             - Address of the table (might be a virtual
 218  *                                    address depending on the table_flags)
 219  *              flags               - Flags for the table
 220  *              reload              - Whether reload should be performed
 221  *              override            - Whether override should be performed
 222  *              table_index         - Where the table index is returned
 223  *
 224  * RETURN:      Status
 225  *
 226  * DESCRIPTION: This function is called to install an ACPI table that is
 227  *              neither DSDT nor FACS (a "standard" table.)
 228  *              When this function is called by "Load" or "LoadTable" opcodes,
 229  *              or by acpi_load_table() API, the "Reload" parameter is set.
 230  *              After sucessfully returning from this function, table is
 231  *              "INSTALLED" but not "VALIDATED".
 232  *
 233  ******************************************************************************/
 234
 235 acpi_status
 236 acpi_tb_install_standard_table(acpi_physical_address address,
 237                                u8 flags,
 238                                u8 reload, u8 override, u32 *table_index)
 239 {
 240         u32 i;
 241         acpi_status status = AE_OK;
 242         struct acpi_table_desc new_table_desc;
 243
 244         ACPI_FUNCTION_TRACE(tb_install_standard_table);
 245
 246         /* Acquire a temporary table descriptor for validation */
 247
 248         status = acpi_tb_acquire_temp_table(&new_table_desc, address, flags);
 249         if (ACPI_FAILURE(status)) {
 250                 ACPI_ERROR((AE_INFO,
 251                             "Could not acquire table length at %8.8X%8.8X",
 252                             ACPI_FORMAT_UINT64(address)));
 253                 return_ACPI_STATUS(status);
 254         }
 255
 256         /*
 257          * Optionally do not load any SSDTs from the RSDT/XSDT. This can
 258          * be useful for debugging ACPI problems on some machines.
 259          */
 260         if (!reload &&
 261             acpi_gbl_disable_ssdt_table_install &&
 262             ACPI_COMPARE_NAME(&new_table_desc.signature, ACPI_SIG_SSDT)) {
 263                 ACPI_INFO((AE_INFO,
 264                            "Ignoring installation of %4.4s at %8.8X%8.8X",
 265                            new_table_desc.signature.ascii,
 266                            ACPI_FORMAT_UINT64(address)));
 267                 goto release_and_exit;
 268         }
 269
 270         /* Validate and verify a table before installation */
 271
 272         status = acpi_tb_verify_temp_table(&new_table_desc, NULL);
 273         if (ACPI_FAILURE(status)) {
 274                 goto release_and_exit;
 275         }
 276
 277         if (reload) {
 278                 /*
 279                  * Validate the incoming table signature.
 280                  *
 281                  * 1) Originally, we checked the table signature for "SSDT" or "PSDT".
 282                  * 2) We added support for OEMx tables, signature "OEM".
 283                  * 3) Valid tables were encountered with a null signature, so we just
 284                  *    gave up on validating the signature, (05/2008).
 285                  * 4) We encountered non-AML tables such as the MADT, which caused
 286                  *    interpreter errors and kernel faults. So now, we once again allow
 287                  *    only "SSDT", "OEMx", and now, also a null signature. (05/2011).
 288                  */
 289                 if ((new_table_desc.signature.ascii[0] != 0x00) &&
 290                     (!ACPI_COMPARE_NAME
 291                      (&new_table_desc.signature, ACPI_SIG_SSDT))
 292                     && (ACPI_STRNCMP(new_table_desc.signature.ascii, "OEM", 3)))
 293                 {
 294                         ACPI_BIOS_ERROR((AE_INFO,
 295                                          "Table has invalid signature [%4.4s] (0x%8.8X), "
 296                                          "must be SSDT or OEMx",
 297                                          acpi_ut_valid_acpi_name(new_table_desc.
 298                                                                  signature.
 299                                                                  ascii) ?
 300                                          new_table_desc.signature.
 301                                          ascii : "????",
 302                                          new_table_desc.signature.integer));
 303
 304                         status = AE_BAD_SIGNATURE;
 305                         goto release_and_exit;
 306                 }
 307
 308                 /* Check if table is already registered */
 309
 310                 for (i = 0; i < acpi_gbl_root_table_list.current_table_count;
 311                      ++i) {
 312                         /*
 313                          * Check for a table match on the entire table length,
 314                          * not just the header.
 315                          */
 316                         if (!acpi_tb_compare_tables(&new_table_desc, i)) {
 317                                 continue;
 318                         }
 319
 320                         /*
 321                          * Note: the current mechanism does not unregister a table if it is
 322                          * dynamically unloaded. The related namespace entries are deleted,
 323                          * but the table remains in the root table list.
 324                          *
 325                          * The assumption here is that the number of different tables that
 326                          * will be loaded is actually small, and there is minimal overhead
 327                          * in just keeping the table in case it is needed again.
 328                          *
 329                          * If this assumption changes in the future (perhaps on large
 330                          * machines with many table load/unload operations), tables will
 331                          * need to be unregistered when they are unloaded, and slots in the
 332                          * root table list should be reused when empty.
 333                          */
 334                         if (acpi_gbl_root_table_list.tables[i].
 335                             flags & ACPI_TABLE_IS_LOADED) {
 336
 337                                 /* Table is still loaded, this is an error */
 338
 339                                 status = AE_ALREADY_EXISTS;
 340                                 goto release_and_exit;
 341                         } else {
 342                                 /*
 343                                  * Table was unloaded, allow it to be reloaded.
 344                                  * As we are going to return AE_OK to the caller, we should
 345                                  * take the responsibility of freeing the input descriptor.
 346                                  * Refill the input descriptor to ensure
 347                                  * acpi_tb_install_table_with_override() can be called again to
 348                                  * indicate the re-installation.
 349                                  */
 350                                 acpi_tb_uninstall_table(&new_table_desc);
 351                                 *table_index = i;
 352                                 return_ACPI_STATUS(AE_OK);
 353                         }
 354                 }
 355         }
 356
 357         /* Add the table to the global root table list */
 358
 359         status = acpi_tb_get_next_table_descriptor(&i, NULL);
 360         if (ACPI_FAILURE(status)) {
 361                 goto release_and_exit;
 362         }
 363
 364         *table_index = i;
 365         acpi_tb_install_table_with_override(i, &new_table_desc, override);
 366
 367 release_and_exit:
 368
 369         /* Release the temporary table descriptor */
 370
 371         acpi_tb_release_temp_table(&new_table_desc);
 372         return_ACPI_STATUS(status);
 373 }
 374
 375 /*******************************************************************************
 376  *
 377  * FUNCTION:    acpi_tb_override_table
 378  *
 379  * PARAMETERS:  old_table_desc      - Validated table descriptor to be
 380  *                                    overridden
 381  *
 382  * RETURN:      None
 383  *
 384  * DESCRIPTION: Attempt table override by calling the OSL override functions.
 385  *              Note: If the table is overridden, then the entire new table
 386  *              is acquired and returned by this function.
 387  *              Before/after invocation, the table descriptor is in a state
 388  *              that is "VALIDATED".
 389  *
 390  ******************************************************************************/
 391
 392 void acpi_tb_override_table(struct acpi_table_desc *old_table_desc)
 393 {
 394         acpi_status status;
 395         char *override_type;
 396         struct acpi_table_desc new_table_desc;
 397         struct acpi_table_header *table;
 398         acpi_physical_address address;
 399         u32 length;
 400
 401         /* (1) Attempt logical override (returns a logical address) */
 402
 403         status = acpi_os_table_override(old_table_desc->pointer, &table);
 404         if (ACPI_SUCCESS(status) && table) {
 405                 acpi_tb_acquire_temp_table(&new_table_desc,
 406                                            ACPI_PTR_TO_PHYSADDR(table),
 407                                            ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL);
 408                 override_type = "Logical";
 409                 goto finish_override;
 410         }
 411
 412         /* (2) Attempt physical override (returns a physical address) */
 413
 414         status = acpi_os_physical_table_override(old_table_desc->pointer,
 415                                                  &address, &length);
 416         if (ACPI_SUCCESS(status) && address && length) {
 417                 acpi_tb_acquire_temp_table(&new_table_desc, address,
 418                                            ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL);
 419                 override_type = "Physical";
 420                 goto finish_override;
 421         }
 422
 423         return;                 /* There was no override */
 424
 425 finish_override:
 426
 427         /* Validate and verify a table before overriding */
 428
 429         status = acpi_tb_verify_temp_table(&new_table_desc, NULL);
 430         if (ACPI_FAILURE(status)) {
 431                 return;
 432         }
 433
 434         ACPI_INFO((AE_INFO, "%4.4s 0x%8.8X%8.8X"
 435                    " %s table override, new table: 0x%8.8X%8.8X",
 436                    old_table_desc->signature.ascii,
 437                    ACPI_FORMAT_UINT64(old_table_desc->address),
 438                    override_type, ACPI_FORMAT_UINT64(new_table_desc.address)));
 439
 440         /* We can now uninstall the original table */
 441
 442         acpi_tb_uninstall_table(old_table_desc);
 443
 444         /*
 445          * Replace the original table descriptor and keep its state as
 446          * "VALIDATED".
 447          */
 448         acpi_tb_init_table_descriptor(old_table_desc, new_table_desc.address,
 449                                       new_table_desc.flags,
 450                                       new_table_desc.pointer);
 451         acpi_tb_validate_temp_table(old_table_desc);
 452
 453         /* Release the temporary table descriptor */
 454
 455         acpi_tb_release_temp_table(&new_table_desc);
 456 }
 457
 458 /*******************************************************************************
 459  *
 460  * FUNCTION:    acpi_tb_uninstall_table
 461  *
 462  * PARAMETERS:  table_desc          - Table descriptor
 463  *
 464  * RETURN:      None
 465  *
 466  * DESCRIPTION: Delete one internal ACPI table
 467  *
 468  ******************************************************************************/
 469
 470 void acpi_tb_uninstall_table(struct acpi_table_desc *table_desc)
 471 {
 472
 473         ACPI_FUNCTION_TRACE(tb_uninstall_table);
 474
 475         /* Table must be installed */
 476
 477         if (!table_desc->address) {
 478                 return_VOID;
 479         }
 480
 481         acpi_tb_invalidate_table(table_desc);
 482
 483         if ((table_desc->flags & ACPI_TABLE_ORIGIN_MASK) ==
 484             ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL) {
 485                 ACPI_FREE(ACPI_PHYSADDR_TO_PTR(table_desc->address));
 486         }
 487
 488         table_desc->address = ACPI_PTR_TO_PHYSADDR(NULL);
 489         return_VOID;
 490 }