kernel/drivers/acpi/acpica/tbxfload.c

   1 /******************************************************************************
   2  *
   3  * Module Name: tbxfload - Table load/unload external interfaces
   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 #define EXPORT_ACPI_INTERFACES
  45
  46 #include <acpi/acpi.h>
  47 #include "accommon.h"
  48 #include "acnamesp.h"
  49 #include "actables.h"
  50
  51 #define _COMPONENT          ACPI_TABLES
  52 ACPI_MODULE_NAME("tbxfload")
  53
  54 /*******************************************************************************
  55  *
  56  * FUNCTION:    acpi_load_tables
  57  *
  58  * PARAMETERS:  None
  59  *
  60  * RETURN:      Status
  61  *
  62  * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT
  63  *
  64  ******************************************************************************/
  65 acpi_status __init acpi_load_tables(void)
  66 {
  67         acpi_status status;
  68
  69         ACPI_FUNCTION_TRACE(acpi_load_tables);
  70
  71         /* Load the namespace from the tables */
  72
  73         status = acpi_tb_load_namespace();
  74
  75         /* Don't let single failures abort the load */
  76
  77         if (status == AE_CTRL_TERMINATE) {
  78                 status = AE_OK;
  79         }
  80
  81         if (ACPI_FAILURE(status)) {
  82                 ACPI_EXCEPTION((AE_INFO, status,
  83                                 "While loading namespace from ACPI tables"));
  84         }
  85
  86         return_ACPI_STATUS(status);
  87 }
  88
  89 ACPI_EXPORT_SYMBOL_INIT(acpi_load_tables)
  90
  91 /*******************************************************************************
  92  *
  93  * FUNCTION:    acpi_tb_load_namespace
  94  *
  95  * PARAMETERS:  None
  96  *
  97  * RETURN:      Status
  98  *
  99  * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in
 100  *              the RSDT/XSDT.
 101  *
 102  ******************************************************************************/
 103 acpi_status acpi_tb_load_namespace(void)
 104 {
 105         acpi_status status;
 106         u32 i;
 107         struct acpi_table_header *new_dsdt;
 108         struct acpi_table_desc *table;
 109         u32 tables_loaded = 0;
 110         u32 tables_failed = 0;
 111
 112         ACPI_FUNCTION_TRACE(tb_load_namespace);
 113
 114         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 115
 116         /*
 117          * Load the namespace. The DSDT is required, but any SSDT and
 118          * PSDT tables are optional. Verify the DSDT.
 119          */
 120         table = &acpi_gbl_root_table_list.tables[acpi_gbl_dsdt_index];
 121
 122         if (!acpi_gbl_root_table_list.current_table_count ||
 123             !ACPI_COMPARE_NAME(table->signature.ascii, ACPI_SIG_DSDT) ||
 124             ACPI_FAILURE(acpi_tb_validate_table(table))) {
 125                 status = AE_NO_ACPI_TABLES;
 126                 goto unlock_and_exit;
 127         }
 128
 129         /*
 130          * Save the DSDT pointer for simple access. This is the mapped memory
 131          * address. We must take care here because the address of the .Tables
 132          * array can change dynamically as tables are loaded at run-time. Note:
 133          * .Pointer field is not validated until after call to acpi_tb_validate_table.
 134          */
 135         acpi_gbl_DSDT = table->pointer;
 136
 137         /*
 138          * Optionally copy the entire DSDT to local memory (instead of simply
 139          * mapping it.) There are some BIOSs that corrupt or replace the original
 140          * DSDT, creating the need for this option. Default is FALSE, do not copy
 141          * the DSDT.
 142          */
 143         if (acpi_gbl_copy_dsdt_locally) {
 144                 new_dsdt = acpi_tb_copy_dsdt(acpi_gbl_dsdt_index);
 145                 if (new_dsdt) {
 146                         acpi_gbl_DSDT = new_dsdt;
 147                 }
 148         }
 149
 150         /*
 151          * Save the original DSDT header for detection of table corruption
 152          * and/or replacement of the DSDT from outside the OS.
 153          */
 154         memcpy(&acpi_gbl_original_dsdt_header, acpi_gbl_DSDT,
 155                sizeof(struct acpi_table_header));
 156
 157         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 158
 159         /* Load and parse tables */
 160
 161         status = acpi_ns_load_table(acpi_gbl_dsdt_index, acpi_gbl_root_node);
 162         if (ACPI_FAILURE(status)) {
 163                 ACPI_EXCEPTION((AE_INFO, status, "[DSDT] table load failed"));
 164                 tables_failed++;
 165         } else {
 166                 tables_loaded++;
 167         }
 168
 169         /* Load any SSDT or PSDT tables. Note: Loop leaves tables locked */
 170
 171         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 172         for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
 173                 table = &acpi_gbl_root_table_list.tables[i];
 174
 175                 if (!acpi_gbl_root_table_list.tables[i].address ||
 176                     (!ACPI_COMPARE_NAME(table->signature.ascii, ACPI_SIG_SSDT)
 177                      && !ACPI_COMPARE_NAME(table->signature.ascii,
 178                                            ACPI_SIG_PSDT)
 179                      && !ACPI_COMPARE_NAME(table->signature.ascii,
 180                                            ACPI_SIG_OSDT))
 181                     || ACPI_FAILURE(acpi_tb_validate_table(table))) {
 182                         continue;
 183                 }
 184
 185                 /* Ignore errors while loading tables, get as many as possible */
 186
 187                 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 188                 status = acpi_ns_load_table(i, acpi_gbl_root_node);
 189                 if (ACPI_FAILURE(status)) {
 190                         ACPI_EXCEPTION((AE_INFO, status,
 191                                         "(%4.4s:%8.8s) while loading table",
 192                                         table->signature.ascii,
 193                                         table->pointer->oem_table_id));
 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                 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 205         }
 206
 207         if (!tables_failed) {
 208                 ACPI_INFO((AE_INFO,
 209                            "%u ACPI AML tables successfully acquired and loaded",
 210                            tables_loaded));
 211         } else {
 212                 ACPI_ERROR((AE_INFO,
 213                             "%u table load failures, %u successful",
 214                             tables_failed, tables_loaded));
 215
 216                 /* Indicate at least one failure */
 217
 218                 status = AE_CTRL_TERMINATE;
 219         }
 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:  address             - Address of the ACPI table to be installed.
 231  *              physical            - Whether the address is a physical table
 232  *                                    address or not
 233  *
 234  * RETURN:      Status
 235  *
 236  * DESCRIPTION: Dynamically install an ACPI table.
 237  *              Note: This function should only be invoked after
 238  *                    acpi_initialize_tables() and before acpi_load_tables().
 239  *
 240  ******************************************************************************/
 241
 242 acpi_status __init
 243 acpi_install_table(acpi_physical_address address, u8 physical)
 244 {
 245         acpi_status status;
 246         u8 flags;
 247         u32 table_index;
 248
 249         ACPI_FUNCTION_TRACE(acpi_install_table);
 250
 251         if (physical) {
 252                 flags = ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL;
 253         } else {
 254                 flags = ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL;
 255         }
 256
 257         status = acpi_tb_install_standard_table(address, flags,
 258                                                 FALSE, FALSE, &table_index);
 259
 260         return_ACPI_STATUS(status);
 261 }
 262
 263 ACPI_EXPORT_SYMBOL_INIT(acpi_install_table)
 264
 265 /*******************************************************************************
 266  *
 267  * FUNCTION:    acpi_load_table
 268  *
 269  * PARAMETERS:  table               - Pointer to a buffer containing the ACPI
 270  *                                    table to be loaded.
 271  *
 272  * RETURN:      Status
 273  *
 274  * DESCRIPTION: Dynamically load an ACPI table from the caller's buffer. Must
 275  *              be a valid ACPI table with a valid ACPI table header.
 276  *              Note1: Mainly intended to support hotplug addition of SSDTs.
 277  *              Note2: Does not copy the incoming table. User is responsible
 278  *              to ensure that the table is not deleted or unmapped.
 279  *
 280  ******************************************************************************/
 281 acpi_status acpi_load_table(struct acpi_table_header *table)
 282 {
 283         acpi_status status;
 284         u32 table_index;
 285
 286         ACPI_FUNCTION_TRACE(acpi_load_table);
 287
 288         /* Parameter validation */
 289
 290         if (!table) {
 291                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 292         }
 293
 294         /* Must acquire the interpreter lock during this operation */
 295
 296         status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
 297         if (ACPI_FAILURE(status)) {
 298                 return_ACPI_STATUS(status);
 299         }
 300
 301         /* Install the table and load it into the namespace */
 302
 303         ACPI_INFO((AE_INFO, "Host-directed Dynamic ACPI Table Load:"));
 304         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 305
 306         status = acpi_tb_install_standard_table(ACPI_PTR_TO_PHYSADDR(table),
 307                                                 ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL,
 308                                                 TRUE, FALSE, &table_index);
 309
 310         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 311         if (ACPI_FAILURE(status)) {
 312                 goto unlock_and_exit;
 313         }
 314
 315         /*
 316          * Note: Now table is "INSTALLED", it must be validated before
 317          * using.
 318          */
 319         status =
 320             acpi_tb_validate_table(&acpi_gbl_root_table_list.
 321                                    tables[table_index]);
 322         if (ACPI_FAILURE(status)) {
 323                 goto unlock_and_exit;
 324         }
 325
 326         status = acpi_ns_load_table(table_index, acpi_gbl_root_node);
 327
 328         /* Invoke table handler if present */
 329
 330         if (acpi_gbl_table_handler) {
 331                 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD, table,
 332                                              acpi_gbl_table_handler_context);
 333         }
 334
 335 unlock_and_exit:
 336         (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
 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 interpreter lock during this operation */
 386
 387         status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
 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_NAME
 406                     (acpi_gbl_root_table_list.tables[i].signature.ascii,
 407                      ACPI_SIG_DSDT)) {
 408                         status = AE_TYPE;
 409                         break;
 410                 }
 411
 412                 /* Ensure the table is actually loaded */
 413
 414                 if (!acpi_tb_is_table_loaded(i)) {
 415                         status = AE_NOT_EXIST;
 416                         break;
 417                 }
 418
 419                 /* Invoke table handler if present */
 420
 421                 if (acpi_gbl_table_handler) {
 422                         (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_UNLOAD,
 423                                                      acpi_gbl_root_table_list.
 424                                                      tables[i].pointer,
 425                                                      acpi_gbl_table_handler_context);
 426                 }
 427
 428                 /*
 429                  * Delete all namespace objects owned by this table. Note that
 430                  * these objects can appear anywhere in the namespace by virtue
 431                  * of the AML "Scope" operator. Thus, we need to track ownership
 432                  * by an ID, not simply a position within the hierarchy.
 433                  */
 434                 status = acpi_tb_delete_namespace_by_owner(i);
 435                 if (ACPI_FAILURE(status)) {
 436                         break;
 437                 }
 438
 439                 status = acpi_tb_release_owner_id(i);
 440                 acpi_tb_set_table_loaded_flag(i, FALSE);
 441                 break;
 442         }
 443
 444         (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
 445         return_ACPI_STATUS(status);
 446 }
 447
 448 ACPI_EXPORT_SYMBOL(acpi_unload_parent_table)