drivers/acpi/acpica/tbxfload.c

   1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
   2 /******************************************************************************
   3  *
   4  * Module Name: tbxfload - Table load/unload external interfaces
   5  *
   6  * Copyright (C) 2000 - 2021, Intel Corp.
   7  *
   8  *****************************************************************************/
   9
  10 #define EXPORT_ACPI_INTERFACES
  11
  12 #include <acpi/acpi.h>
  13 #include "accommon.h"
  14 #include "acnamesp.h"
  15 #include "actables.h"
  16 #include "acevents.h"
  17
  18 #define _COMPONENT          ACPI_TABLES
  19 ACPI_MODULE_NAME("tbxfload")
  20
  21 /*******************************************************************************
  22  *
  23  * FUNCTION:    acpi_load_tables
  24  *
  25  * PARAMETERS:  None
  26  *
  27  * RETURN:      Status
  28  *
  29  * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT
  30  *
  31  ******************************************************************************/
  32 acpi_status ACPI_INIT_FUNCTION acpi_load_tables(void)
  33 {
  34         acpi_status status;
  35
  36         ACPI_FUNCTION_TRACE(acpi_load_tables);
  37
  38         /*
  39          * Install the default operation region handlers. These are the
  40          * handlers that are defined by the ACPI specification to be
  41          * "always accessible" -- namely, system_memory, system_IO, and
  42          * PCI_Config. This also means that no _REG methods need to be
  43          * run for these address spaces. We need to have these handlers
  44          * installed before any AML code can be executed, especially any
  45          * module-level code (11/2015).
  46          * Note that we allow OSPMs to install their own region handlers
  47          * between acpi_initialize_subsystem() and acpi_load_tables() to use
  48          * their customized default region handlers.
  49          */
  50         status = acpi_ev_install_region_handlers();
  51         if (ACPI_FAILURE(status)) {
  52                 ACPI_EXCEPTION((AE_INFO, status,
  53                                 "During Region initialization"));
  54                 return_ACPI_STATUS(status);
  55         }
  56
  57         /* Load the namespace from the tables */
  58
  59         status = acpi_tb_load_namespace();
  60
  61         /* Don't let single failures abort the load */
  62
  63         if (status == AE_CTRL_TERMINATE) {
  64                 status = AE_OK;
  65         }
  66
  67         if (ACPI_FAILURE(status)) {
  68                 ACPI_EXCEPTION((AE_INFO, status,
  69                                 "While loading namespace from ACPI tables"));
  70         }
  71
  72         /*
  73          * Initialize the objects in the namespace that remain uninitialized.
  74          * This runs the executable AML that may be part of the declaration of
  75          * these name objects:
  76          *     operation_regions, buffer_fields, Buffers, and Packages.
  77          *
  78          */
  79         status = acpi_ns_initialize_objects();
  80         if (ACPI_SUCCESS(status)) {
  81                 acpi_gbl_namespace_initialized = TRUE;
  82         }
  83
  84         return_ACPI_STATUS(status);
  85 }
  86
  87 ACPI_EXPORT_SYMBOL_INIT(acpi_load_tables)
  88
  89 /*******************************************************************************
  90  *
  91  * FUNCTION:    acpi_tb_load_namespace
  92  *
  93  * PARAMETERS:  None
  94  *
  95  * RETURN:      Status
  96  *
  97  * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in
  98  *              the RSDT/XSDT.
  99  *
 100  ******************************************************************************/
 101 acpi_status acpi_tb_load_namespace(void)
 102 {
 103         acpi_status status;
 104         u32 i;
 105         struct acpi_table_header *new_dsdt;
 106         struct acpi_table_desc *table;
 107         u32 tables_loaded = 0;
 108         u32 tables_failed = 0;
 109
 110         ACPI_FUNCTION_TRACE(tb_load_namespace);
 111
 112         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 113
 114         /*
 115          * Load the namespace. The DSDT is required, but any SSDT and
 116          * PSDT tables are optional. Verify the DSDT.
 117          */
 118         table = &acpi_gbl_root_table_list.tables[acpi_gbl_dsdt_index];
 119
 120         if (!acpi_gbl_root_table_list.current_table_count ||
 121             !ACPI_COMPARE_NAMESEG(table->signature.ascii, ACPI_SIG_DSDT) ||
 122             ACPI_FAILURE(acpi_tb_validate_table(table))) {
 123                 status = AE_NO_ACPI_TABLES;
 124                 goto unlock_and_exit;
 125         }
 126
 127         /*
 128          * Save the DSDT pointer for simple access. This is the mapped memory
 129          * address. We must take care here because the address of the .Tables
 130          * array can change dynamically as tables are loaded at run-time. Note:
 131          * .Pointer field is not validated until after call to acpi_tb_validate_table.
 132          */
 133         acpi_gbl_DSDT = table->pointer;
 134
 135         /*
 136          * Optionally copy the entire DSDT to local memory (instead of simply
 137          * mapping it.) There are some BIOSs that corrupt or replace the original
 138          * DSDT, creating the need for this option. Default is FALSE, do not copy
 139          * the DSDT.
 140          */
 141         if (acpi_gbl_copy_dsdt_locally) {
 142                 new_dsdt = acpi_tb_copy_dsdt(acpi_gbl_dsdt_index);
 143                 if (new_dsdt) {
 144                         acpi_gbl_DSDT = new_dsdt;
 145                 }
 146         }
 147
 148         /*
 149          * Save the original DSDT header for detection of table corruption
 150          * and/or replacement of the DSDT from outside the OS.
 151          */
 152         memcpy(&acpi_gbl_original_dsdt_header, acpi_gbl_DSDT,
 153                sizeof(struct acpi_table_header));
 154
 155         /* Load and parse tables */
 156
 157         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 158         status = acpi_ns_load_table(acpi_gbl_dsdt_index, acpi_gbl_root_node);
 159         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 160         if (ACPI_FAILURE(status)) {
 161                 ACPI_EXCEPTION((AE_INFO, status, "[DSDT] table load failed"));
 162                 tables_failed++;
 163         } else {
 164                 tables_loaded++;
 165         }
 166
 167         /* Load any SSDT or PSDT tables. Note: Loop leaves tables locked */
 168
 169         for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
 170                 table = &acpi_gbl_root_table_list.tables[i];
 171
 172                 if (!table->address ||
 173                     (!ACPI_COMPARE_NAMESEG
 174                      (table->signature.ascii, ACPI_SIG_SSDT)
 175                      && !ACPI_COMPARE_NAMESEG(table->signature.ascii,
 176                                               ACPI_SIG_PSDT)
 177                      && !ACPI_COMPARE_NAMESEG(table->signature.ascii,
 178                                               ACPI_SIG_OSDT))
 179                     || ACPI_FAILURE(acpi_tb_validate_table(table))) {
 180                         continue;
 181                 }
 182
 183                 /* Ignore errors while loading tables, get as many as possible */
 184
 185                 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 186                 status = acpi_ns_load_table(i, acpi_gbl_root_node);
 187                 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 188                 if (ACPI_FAILURE(status)) {
 189                         ACPI_EXCEPTION((AE_INFO, status,
 190                                         "(%4.4s:%8.8s) while loading table",
 191                                         table->signature.ascii,
 192                                         table->pointer->oem_table_id));
 193
 194                         tables_failed++;
 195
 196                         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
 197                                               "Table [%4.4s:%8.8s] (id FF) - Table namespace load failed\n\n",
 198                                               table->signature.ascii,
 199                                               table->pointer->oem_table_id));
 200                 } else {
 201                         tables_loaded++;
 202                 }
 203         }
 204
 205         if (!tables_failed) {
 206                 ACPI_INFO(("%u ACPI AML tables successfully acquired and loaded", tables_loaded));
 207         } else {
 208                 ACPI_ERROR((AE_INFO,
 209                             "%u table load failures, %u successful",
 210                             tables_failed, tables_loaded));
 211
 212                 /* Indicate at least one failure */
 213
 214                 status = AE_CTRL_TERMINATE;
 215         }
 216
 217 #ifdef ACPI_APPLICATION
 218         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "\n"));
 219 #endif
 220
 221 unlock_and_exit:
 222         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 223         return_ACPI_STATUS(status);
 224 }
 225
 226 /*******************************************************************************
 227  *
 228  * FUNCTION:    acpi_install_table
 229  *
 230  * PARAMETERS:  table               - Pointer to the ACPI table to be installed.
 231  *
 232  * RETURN:      Status
 233  *
 234  * DESCRIPTION: Dynamically install an ACPI table.
 235  *              Note: This function should only be invoked after
 236  *                    acpi_initialize_tables() and before acpi_load_tables().
 237  *
 238  ******************************************************************************/
 239
 240 acpi_status ACPI_INIT_FUNCTION
 241 acpi_install_table(struct acpi_table_header *table)
 242 {
 243         acpi_status status;
 244         u32 table_index;
 245
 246         ACPI_FUNCTION_TRACE(acpi_install_table);
 247
 248         status = acpi_tb_install_standard_table(ACPI_PTR_TO_PHYSADDR(table),
 249                                                 ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL,
 250                                                 table, FALSE, FALSE,
 251                                                 &table_index);
 252
 253         return_ACPI_STATUS(status);
 254 }
 255
 256 ACPI_EXPORT_SYMBOL_INIT(acpi_install_table)
 257
 258 /*******************************************************************************
 259  *
 260  * FUNCTION:    acpi_install_physical_table
 261  *
 262  * PARAMETERS:  address             - Address of the ACPI table to be installed.
 263  *
 264  * RETURN:      Status
 265  *
 266  * DESCRIPTION: Dynamically install an ACPI table.
 267  *              Note: This function should only be invoked after
 268  *                    acpi_initialize_tables() and before acpi_load_tables().
 269  *
 270  ******************************************************************************/
 271 acpi_status ACPI_INIT_FUNCTION
 272 acpi_install_physical_table(acpi_physical_address address)
 273 {
 274         acpi_status status;
 275         u32 table_index;
 276
 277         ACPI_FUNCTION_TRACE(acpi_install_physical_table);
 278
 279         status = acpi_tb_install_standard_table(address,
 280                                                 ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL,
 281                                                 NULL, FALSE, FALSE,
 282                                                 &table_index);
 283
 284         return_ACPI_STATUS(status);
 285 }
 286
 287 ACPI_EXPORT_SYMBOL_INIT(acpi_install_physical_table)
 288
 289 /*******************************************************************************
 290  *
 291  * FUNCTION:    acpi_load_table
 292  *
 293  * PARAMETERS:  table               - Pointer to a buffer containing the ACPI
 294  *                                    table to be loaded.
 295  *              table_idx           - Pointer to a u32 for storing the table
 296  *                                    index, might be NULL
 297  *
 298  * RETURN:      Status
 299  *
 300  * DESCRIPTION: Dynamically load an ACPI table from the caller's buffer. Must
 301  *              be a valid ACPI table with a valid ACPI table header.
 302  *              Note1: Mainly intended to support hotplug addition of SSDTs.
 303  *              Note2: Does not copy the incoming table. User is responsible
 304  *              to ensure that the table is not deleted or unmapped.
 305  *
 306  ******************************************************************************/
 307 acpi_status acpi_load_table(struct acpi_table_header *table, u32 *table_idx)
 308 {
 309         acpi_status status;
 310         u32 table_index;
 311
 312         ACPI_FUNCTION_TRACE(acpi_load_table);
 313
 314         /* Parameter validation */
 315
 316         if (!table) {
 317                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 318         }
 319
 320         /* Install the table and load it into the namespace */
 321
 322         ACPI_INFO(("Host-directed Dynamic ACPI Table Load:"));
 323         status = acpi_tb_install_and_load_table(ACPI_PTR_TO_PHYSADDR(table),
 324                                                 ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL,
 325                                                 table, FALSE, &table_index);
 326         if (table_idx) {
 327                 *table_idx = table_index;
 328         }
 329
 330         if (ACPI_SUCCESS(status)) {
 331
 332                 /* Complete the initialization/resolution of new objects */
 333
 334                 acpi_ns_initialize_objects();
 335         }
 336
 337         return_ACPI_STATUS(status);
 338 }
 339
 340 ACPI_EXPORT_SYMBOL(acpi_load_table)
 341
 342 /*******************************************************************************
 343  *
 344  * FUNCTION:    acpi_unload_parent_table
 345  *
 346  * PARAMETERS:  object              - Handle to any namespace object owned by
 347  *                                    the table to be unloaded
 348  *
 349  * RETURN:      Status
 350  *
 351  * DESCRIPTION: Via any namespace object within an SSDT or OEMx table, unloads
 352  *              the table and deletes all namespace objects associated with
 353  *              that table. Unloading of the DSDT is not allowed.
 354  *              Note: Mainly intended to support hotplug removal of SSDTs.
 355  *
 356  ******************************************************************************/
 357 acpi_status acpi_unload_parent_table(acpi_handle object)
 358 {
 359         struct acpi_namespace_node *node =
 360             ACPI_CAST_PTR(struct acpi_namespace_node, object);
 361         acpi_status status = AE_NOT_EXIST;
 362         acpi_owner_id owner_id;
 363         u32 i;
 364
 365         ACPI_FUNCTION_TRACE(acpi_unload_parent_table);
 366
 367         /* Parameter validation */
 368
 369         if (!object) {
 370                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 371         }
 372
 373         /*
 374          * The node owner_id is currently the same as the parent table ID.
 375          * However, this could change in the future.
 376          */
 377         owner_id = node->owner_id;
 378         if (!owner_id) {
 379
 380                 /* owner_id==0 means DSDT is the owner. DSDT cannot be unloaded */
 381
 382                 return_ACPI_STATUS(AE_TYPE);
 383         }
 384
 385         /* Must acquire the table lock during this operation */
 386
 387         status = acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 388         if (ACPI_FAILURE(status)) {
 389                 return_ACPI_STATUS(status);
 390         }
 391
 392         /* Find the table in the global table list */
 393
 394         for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) {
 395                 if (owner_id != acpi_gbl_root_table_list.tables[i].owner_id) {
 396                         continue;
 397                 }
 398
 399                 /*
 400                  * Allow unload of SSDT and OEMx tables only. Do not allow unload
 401                  * of the DSDT. No other types of tables should get here, since
 402                  * only these types can contain AML and thus are the only types
 403                  * that can create namespace objects.
 404                  */
 405                 if (ACPI_COMPARE_NAMESEG
 406                     (acpi_gbl_root_table_list.tables[i].signature.ascii,
 407                      ACPI_SIG_DSDT)) {
 408                         status = AE_TYPE;
 409                         break;
 410                 }
 411
 412                 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 413                 status = acpi_tb_unload_table(i);
 414                 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 415                 break;
 416         }
 417
 418         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 419         return_ACPI_STATUS(status);
 420 }
 421
 422 ACPI_EXPORT_SYMBOL(acpi_unload_parent_table)
 423 /*******************************************************************************
 424  *
 425  * FUNCTION:    acpi_unload_table
 426  *
 427  * PARAMETERS:  table_index         - Index as returned by acpi_load_table
 428  *
 429  * RETURN:      Status
 430  *
 431  * DESCRIPTION: Via the table_index representing an SSDT or OEMx table, unloads
 432  *              the table and deletes all namespace objects associated with
 433  *              that table. Unloading of the DSDT is not allowed.
 434  *              Note: Mainly intended to support hotplug removal of SSDTs.
 435  *
 436  ******************************************************************************/
 437 acpi_status acpi_unload_table(u32 table_index)
 438 {
 439         acpi_status status;
 440
 441         ACPI_FUNCTION_TRACE(acpi_unload_table);
 442
 443         if (table_index == 1) {
 444
 445                 /* table_index==1 means DSDT is the owner. DSDT cannot be unloaded */
 446
 447                 return_ACPI_STATUS(AE_TYPE);
 448         }
 449
 450         status = acpi_tb_unload_table(table_index);
 451         return_ACPI_STATUS(status);
 452 }
 453
 454 ACPI_EXPORT_SYMBOL(acpi_unload_table)