drivers/acpi/acpica/tbxfload.c

   1 /******************************************************************************
   2  *
   3  * Module Name: tbxfload - Table load/unload external interfaces
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2016, 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 #define EXPORT_ACPI_INTERFACES
  45
  46 #include <acpi/acpi.h>
  47 #include "accommon.h"
  48 #include "acnamesp.h"
  49 #include "actables.h"
  50 #include "acevents.h"
  51
  52 #define _COMPONENT          ACPI_TABLES
  53 ACPI_MODULE_NAME("tbxfload")
  54
  55 /*******************************************************************************
  56  *
  57  * FUNCTION:    acpi_load_tables
  58  *
  59  * PARAMETERS:  None
  60  *
  61  * RETURN:      Status
  62  *
  63  * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT
  64  *
  65  ******************************************************************************/
  66 acpi_status ACPI_INIT_FUNCTION acpi_load_tables(void)
  67 {
  68         acpi_status status;
  69
  70         ACPI_FUNCTION_TRACE(acpi_load_tables);
  71
  72         /*
  73          * Install the default operation region handlers. These are the
  74          * handlers that are defined by the ACPI specification to be
  75          * "always accessible" -- namely, system_memory, system_IO, and
  76          * PCI_Config. This also means that no _REG methods need to be
  77          * run for these address spaces. We need to have these handlers
  78          * installed before any AML code can be executed, especially any
  79          * module-level code (11/2015).
  80          * Note that we allow OSPMs to install their own region handlers
  81          * between acpi_initialize_subsystem() and acpi_load_tables() to use
  82          * their customized default region handlers.
  83          */
  84         status = acpi_ev_install_region_handlers();
  85         if (ACPI_FAILURE(status)) {
  86                 ACPI_EXCEPTION((AE_INFO, status,
  87                                 "During Region initialization"));
  88                 return_ACPI_STATUS(status);
  89         }
  90
  91         /* Load the namespace from the tables */
  92
  93         status = acpi_tb_load_namespace();
  94
  95         /* Don't let single failures abort the load */
  96
  97         if (status == AE_CTRL_TERMINATE) {
  98                 status = AE_OK;
  99         }
 100
 101         if (ACPI_FAILURE(status)) {
 102                 ACPI_EXCEPTION((AE_INFO, status,
 103                                 "While loading namespace from ACPI tables"));
 104         }
 105
 106         if (acpi_gbl_parse_table_as_term_list
 107             || !acpi_gbl_group_module_level_code) {
 108                 /*
 109                  * Initialize the objects that remain uninitialized. This
 110                  * runs the executable AML that may be part of the
 111                  * declaration of these objects:
 112                  * operation_regions, buffer_fields, Buffers, and Packages.
 113                  */
 114                 status = acpi_ns_initialize_objects();
 115                 if (ACPI_FAILURE(status)) {
 116                         return_ACPI_STATUS(status);
 117                 }
 118         }
 119
 120         acpi_gbl_namespace_initialized = TRUE;
 121         return_ACPI_STATUS(status);
 122 }
 123
 124 ACPI_EXPORT_SYMBOL_INIT(acpi_load_tables)
 125
 126 /*******************************************************************************
 127  *
 128  * FUNCTION:    acpi_tb_load_namespace
 129  *
 130  * PARAMETERS:  None
 131  *
 132  * RETURN:      Status
 133  *
 134  * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in
 135  *              the RSDT/XSDT.
 136  *
 137  ******************************************************************************/
 138 acpi_status acpi_tb_load_namespace(void)
 139 {
 140         acpi_status status;
 141         u32 i;
 142         struct acpi_table_header *new_dsdt;
 143         struct acpi_table_desc *table;
 144         u32 tables_loaded = 0;
 145         u32 tables_failed = 0;
 146
 147         ACPI_FUNCTION_TRACE(tb_load_namespace);
 148
 149         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 150
 151         /*
 152          * Load the namespace. The DSDT is required, but any SSDT and
 153          * PSDT tables are optional. Verify the DSDT.
 154          */
 155         table = &acpi_gbl_root_table_list.tables[acpi_gbl_dsdt_index];
 156
 157         if (!acpi_gbl_root_table_list.current_table_count ||
 158             !ACPI_COMPARE_NAME(table->signature.ascii, ACPI_SIG_DSDT) ||
 159             ACPI_FAILURE(acpi_tb_validate_table(table))) {
 160                 status = AE_NO_ACPI_TABLES;
 161                 goto unlock_and_exit;
 162         }
 163
 164         /*
 165          * Save the DSDT pointer for simple access. This is the mapped memory
 166          * address. We must take care here because the address of the .Tables
 167          * array can change dynamically as tables are loaded at run-time. Note:
 168          * .Pointer field is not validated until after call to acpi_tb_validate_table.
 169          */
 170         acpi_gbl_DSDT = table->pointer;
 171
 172         /*
 173          * Optionally copy the entire DSDT to local memory (instead of simply
 174          * mapping it.) There are some BIOSs that corrupt or replace the original
 175          * DSDT, creating the need for this option. Default is FALSE, do not copy
 176          * the DSDT.
 177          */
 178         if (acpi_gbl_copy_dsdt_locally) {
 179                 new_dsdt = acpi_tb_copy_dsdt(acpi_gbl_dsdt_index);
 180                 if (new_dsdt) {
 181                         acpi_gbl_DSDT = new_dsdt;
 182                 }
 183         }
 184
 185         /*
 186          * Save the original DSDT header for detection of table corruption
 187          * and/or replacement of the DSDT from outside the OS.
 188          */
 189         memcpy(&acpi_gbl_original_dsdt_header, acpi_gbl_DSDT,
 190                sizeof(struct acpi_table_header));
 191
 192         /* Load and parse tables */
 193
 194         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 195         status = acpi_ns_load_table(acpi_gbl_dsdt_index, acpi_gbl_root_node);
 196         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 197         if (ACPI_FAILURE(status)) {
 198                 ACPI_EXCEPTION((AE_INFO, status, "[DSDT] table load failed"));
 199                 tables_failed++;
 200         } else {
 201                 tables_loaded++;
 202         }
 203
 204         /* Load any SSDT or PSDT tables. Note: Loop leaves tables locked */
 205
 206         for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
 207                 table = &acpi_gbl_root_table_list.tables[i];
 208
 209                 if (!acpi_gbl_root_table_list.tables[i].address ||
 210                     (!ACPI_COMPARE_NAME(table->signature.ascii, ACPI_SIG_SSDT)
 211                      && !ACPI_COMPARE_NAME(table->signature.ascii,
 212                                            ACPI_SIG_PSDT)
 213                      && !ACPI_COMPARE_NAME(table->signature.ascii,
 214                                            ACPI_SIG_OSDT))
 215                     || ACPI_FAILURE(acpi_tb_validate_table(table))) {
 216                         continue;
 217                 }
 218
 219                 /* Ignore errors while loading tables, get as many as possible */
 220
 221                 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 222                 status = acpi_ns_load_table(i, acpi_gbl_root_node);
 223                 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 224                 if (ACPI_FAILURE(status)) {
 225                         ACPI_EXCEPTION((AE_INFO, status,
 226                                         "(%4.4s:%8.8s) while loading table",
 227                                         table->signature.ascii,
 228                                         table->pointer->oem_table_id));
 229
 230                         tables_failed++;
 231
 232                         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT,
 233                                               "Table [%4.4s:%8.8s] (id FF) - Table namespace load failed\n\n",
 234                                               table->signature.ascii,
 235                                               table->pointer->oem_table_id));
 236                 } else {
 237                         tables_loaded++;
 238                 }
 239         }
 240
 241         if (!tables_failed) {
 242                 ACPI_INFO(("%u ACPI AML tables successfully acquired and loaded", tables_loaded));
 243         } else {
 244                 ACPI_ERROR((AE_INFO,
 245                             "%u table load failures, %u successful",
 246                             tables_failed, tables_loaded));
 247
 248                 /* Indicate at least one failure */
 249
 250                 status = AE_CTRL_TERMINATE;
 251         }
 252
 253 #ifdef ACPI_APPLICATION
 254         ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "\n"));
 255 #endif
 256
 257 unlock_and_exit:
 258         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 259         return_ACPI_STATUS(status);
 260 }
 261
 262 /*******************************************************************************
 263  *
 264  * FUNCTION:    acpi_install_table
 265  *
 266  * PARAMETERS:  address             - Address of the ACPI table to be installed.
 267  *              physical            - Whether the address is a physical table
 268  *                                    address or not
 269  *
 270  * RETURN:      Status
 271  *
 272  * DESCRIPTION: Dynamically install an ACPI table.
 273  *              Note: This function should only be invoked after
 274  *                    acpi_initialize_tables() and before acpi_load_tables().
 275  *
 276  ******************************************************************************/
 277
 278 acpi_status ACPI_INIT_FUNCTION
 279 acpi_install_table(acpi_physical_address address, u8 physical)
 280 {
 281         acpi_status status;
 282         u8 flags;
 283         u32 table_index;
 284
 285         ACPI_FUNCTION_TRACE(acpi_install_table);
 286
 287         if (physical) {
 288                 flags = ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL;
 289         } else {
 290                 flags = ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL;
 291         }
 292
 293         status = acpi_tb_install_standard_table(address, flags,
 294                                                 FALSE, FALSE, &table_index);
 295
 296         return_ACPI_STATUS(status);
 297 }
 298
 299 ACPI_EXPORT_SYMBOL_INIT(acpi_install_table)
 300
 301 /*******************************************************************************
 302  *
 303  * FUNCTION:    acpi_load_table
 304  *
 305  * PARAMETERS:  table               - Pointer to a buffer containing the ACPI
 306  *                                    table to be loaded.
 307  *
 308  * RETURN:      Status
 309  *
 310  * DESCRIPTION: Dynamically load an ACPI table from the caller's buffer. Must
 311  *              be a valid ACPI table with a valid ACPI table header.
 312  *              Note1: Mainly intended to support hotplug addition of SSDTs.
 313  *              Note2: Does not copy the incoming table. User is responsible
 314  *              to ensure that the table is not deleted or unmapped.
 315  *
 316  ******************************************************************************/
 317 acpi_status acpi_load_table(struct acpi_table_header *table)
 318 {
 319         acpi_status status;
 320         u32 table_index;
 321
 322         ACPI_FUNCTION_TRACE(acpi_load_table);
 323
 324         /* Parameter validation */
 325
 326         if (!table) {
 327                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 328         }
 329
 330         /* Install the table and load it into the namespace */
 331
 332         ACPI_INFO(("Host-directed Dynamic ACPI Table Load:"));
 333         status = acpi_tb_install_and_load_table(ACPI_PTR_TO_PHYSADDR(table),
 334                                                 ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL,
 335                                                 FALSE, &table_index);
 336         return_ACPI_STATUS(status);
 337 }
 338
 339 ACPI_EXPORT_SYMBOL(acpi_load_table)
 340
 341 /*******************************************************************************
 342  *
 343  * FUNCTION:    acpi_unload_parent_table
 344  *
 345  * PARAMETERS:  object              - Handle to any namespace object owned by
 346  *                                    the table to be unloaded
 347  *
 348  * RETURN:      Status
 349  *
 350  * DESCRIPTION: Via any namespace object within an SSDT or OEMx table, unloads
 351  *              the table and deletes all namespace objects associated with
 352  *              that table. Unloading of the DSDT is not allowed.
 353  *              Note: Mainly intended to support hotplug removal of SSDTs.
 354  *
 355  ******************************************************************************/
 356 acpi_status acpi_unload_parent_table(acpi_handle object)
 357 {
 358         struct acpi_namespace_node *node =
 359             ACPI_CAST_PTR(struct acpi_namespace_node, object);
 360         acpi_status status = AE_NOT_EXIST;
 361         acpi_owner_id owner_id;
 362         u32 i;
 363
 364         ACPI_FUNCTION_TRACE(acpi_unload_parent_table);
 365
 366         /* Parameter validation */
 367
 368         if (!object) {
 369                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 370         }
 371
 372         /*
 373          * The node owner_id is currently the same as the parent table ID.
 374          * However, this could change in the future.
 375          */
 376         owner_id = node->owner_id;
 377         if (!owner_id) {
 378
 379                 /* owner_id==0 means DSDT is the owner. DSDT cannot be unloaded */
 380
 381                 return_ACPI_STATUS(AE_TYPE);
 382         }
 383
 384         /* Must acquire the table lock during this operation */
 385
 386         status = acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 387         if (ACPI_FAILURE(status)) {
 388                 return_ACPI_STATUS(status);
 389         }
 390
 391         /* Find the table in the global table list */
 392
 393         for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) {
 394                 if (owner_id != acpi_gbl_root_table_list.tables[i].owner_id) {
 395                         continue;
 396                 }
 397
 398                 /*
 399                  * Allow unload of SSDT and OEMx tables only. Do not allow unload
 400                  * of the DSDT. No other types of tables should get here, since
 401                  * only these types can contain AML and thus are the only types
 402                  * that can create namespace objects.
 403                  */
 404                 if (ACPI_COMPARE_NAME
 405                     (acpi_gbl_root_table_list.tables[i].signature.ascii,
 406                      ACPI_SIG_DSDT)) {
 407                         status = AE_TYPE;
 408                         break;
 409                 }
 410
 411                 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 412                 status = acpi_tb_unload_table(i);
 413                 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 414                 break;
 415         }
 416
 417         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 418         return_ACPI_STATUS(status);
 419 }
 420
 421 ACPI_EXPORT_SYMBOL(acpi_unload_parent_table)