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 - 2019, 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_NAME(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_NAME(table->signature.ascii, ACPI_SIG_SSDT)
 174                      && !ACPI_COMPARE_NAME(table->signature.ascii,
 175                                            ACPI_SIG_PSDT)
 176                      && !ACPI_COMPARE_NAME(table->signature.ascii,
 177                                            ACPI_SIG_OSDT))
 178                     || ACPI_FAILURE(acpi_tb_validate_table(table))) {
 179                         continue;
 180                 }
 181
 182                 /* Ignore errors while loading tables, get as many as possible */
 183
 184                 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 185                 status = acpi_ns_load_table(i, acpi_gbl_root_node);
 186                 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 187                 if (ACPI_FAILURE(status)) {
 188                         ACPI_EXCEPTION((AE_INFO, status,
 189                                         "(%4.4s:%8.8s) while loading table",
 190                                         table->signature.ascii,
 191                                         table->pointer->oem_table_id));
 192
 193                         tables_failed++;
 194
 195                         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
 196                                               "Table [%4.4s:%8.8s] (id FF) - Table namespace load failed\n\n",
 197                                               table->signature.ascii,
 198                                               table->pointer->oem_table_id));
 199                 } else {
 200                         tables_loaded++;
 201                 }
 202         }
 203
 204         if (!tables_failed) {
 205                 ACPI_INFO(("%u ACPI AML tables successfully acquired and loaded", tables_loaded));
 206         } else {
 207                 ACPI_ERROR((AE_INFO,
 208                             "%u table load failures, %u successful",
 209                             tables_failed, tables_loaded));
 210
 211                 /* Indicate at least one failure */
 212
 213                 status = AE_CTRL_TERMINATE;
 214         }
 215
 216 #ifdef ACPI_APPLICATION
 217         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "\n"));
 218 #endif
 219
 220 unlock_and_exit:
 221         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 222         return_ACPI_STATUS(status);
 223 }
 224
 225 /*******************************************************************************
 226  *
 227  * FUNCTION:    acpi_install_table
 228  *
 229  * PARAMETERS:  address             - Address of the ACPI table to be installed.
 230  *              physical            - Whether the address is a physical table
 231  *                                    address or not
 232  *
 233  * RETURN:      Status
 234  *
 235  * DESCRIPTION: Dynamically install an ACPI table.
 236  *              Note: This function should only be invoked after
 237  *                    acpi_initialize_tables() and before acpi_load_tables().
 238  *
 239  ******************************************************************************/
 240
 241 acpi_status ACPI_INIT_FUNCTION
 242 acpi_install_table(acpi_physical_address address, u8 physical)
 243 {
 244         acpi_status status;
 245         u8 flags;
 246         u32 table_index;
 247
 248         ACPI_FUNCTION_TRACE(acpi_install_table);
 249
 250         if (physical) {
 251                 flags = ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL;
 252         } else {
 253                 flags = ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL;
 254         }
 255
 256         status = acpi_tb_install_standard_table(address, flags,
 257                                                 FALSE, FALSE, &table_index);
 258
 259         return_ACPI_STATUS(status);
 260 }
 261
 262 ACPI_EXPORT_SYMBOL_INIT(acpi_install_table)
 263
 264 /*******************************************************************************
 265  *
 266  * FUNCTION:    acpi_load_table
 267  *
 268  * PARAMETERS:  table               - Pointer to a buffer containing the ACPI
 269  *                                    table to be loaded.
 270  *
 271  * RETURN:      Status
 272  *
 273  * DESCRIPTION: Dynamically load an ACPI table from the caller's buffer. Must
 274  *              be a valid ACPI table with a valid ACPI table header.
 275  *              Note1: Mainly intended to support hotplug addition of SSDTs.
 276  *              Note2: Does not copy the incoming table. User is responsible
 277  *              to ensure that the table is not deleted or unmapped.
 278  *
 279  ******************************************************************************/
 280 acpi_status acpi_load_table(struct acpi_table_header *table)
 281 {
 282         acpi_status status;
 283         u32 table_index;
 284
 285         ACPI_FUNCTION_TRACE(acpi_load_table);
 286
 287         /* Parameter validation */
 288
 289         if (!table) {
 290                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 291         }
 292
 293         /* Install the table and load it into the namespace */
 294
 295         ACPI_INFO(("Host-directed Dynamic ACPI Table Load:"));
 296         status = acpi_tb_install_and_load_table(ACPI_PTR_TO_PHYSADDR(table),
 297                                                 ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL,
 298                                                 FALSE, &table_index);
 299         return_ACPI_STATUS(status);
 300 }
 301
 302 ACPI_EXPORT_SYMBOL(acpi_load_table)
 303
 304 /*******************************************************************************
 305  *
 306  * FUNCTION:    acpi_unload_parent_table
 307  *
 308  * PARAMETERS:  object              - Handle to any namespace object owned by
 309  *                                    the table to be unloaded
 310  *
 311  * RETURN:      Status
 312  *
 313  * DESCRIPTION: Via any namespace object within an SSDT or OEMx table, unloads
 314  *              the table and deletes all namespace objects associated with
 315  *              that table. Unloading of the DSDT is not allowed.
 316  *              Note: Mainly intended to support hotplug removal of SSDTs.
 317  *
 318  ******************************************************************************/
 319 acpi_status acpi_unload_parent_table(acpi_handle object)
 320 {
 321         struct acpi_namespace_node *node =
 322             ACPI_CAST_PTR(struct acpi_namespace_node, object);
 323         acpi_status status = AE_NOT_EXIST;
 324         acpi_owner_id owner_id;
 325         u32 i;
 326
 327         ACPI_FUNCTION_TRACE(acpi_unload_parent_table);
 328
 329         /* Parameter validation */
 330
 331         if (!object) {
 332                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 333         }
 334
 335         /*
 336          * The node owner_id is currently the same as the parent table ID.
 337          * However, this could change in the future.
 338          */
 339         owner_id = node->owner_id;
 340         if (!owner_id) {
 341
 342                 /* owner_id==0 means DSDT is the owner. DSDT cannot be unloaded */
 343
 344                 return_ACPI_STATUS(AE_TYPE);
 345         }
 346
 347         /* Must acquire the table lock during this operation */
 348
 349         status = acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 350         if (ACPI_FAILURE(status)) {
 351                 return_ACPI_STATUS(status);
 352         }
 353
 354         /* Find the table in the global table list */
 355
 356         for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) {
 357                 if (owner_id != acpi_gbl_root_table_list.tables[i].owner_id) {
 358                         continue;
 359                 }
 360
 361                 /*
 362                  * Allow unload of SSDT and OEMx tables only. Do not allow unload
 363                  * of the DSDT. No other types of tables should get here, since
 364                  * only these types can contain AML and thus are the only types
 365                  * that can create namespace objects.
 366                  */
 367                 if (ACPI_COMPARE_NAME
 368                     (acpi_gbl_root_table_list.tables[i].signature.ascii,
 369                      ACPI_SIG_DSDT)) {
 370                         status = AE_TYPE;
 371                         break;
 372                 }
 373
 374                 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 375                 status = acpi_tb_unload_table(i);
 376                 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 377                 break;
 378         }
 379
 380         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 381         return_ACPI_STATUS(status);
 382 }
 383
 384 ACPI_EXPORT_SYMBOL(acpi_unload_parent_table)