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 /* Local prototypes */
  55 static acpi_status acpi_tb_load_namespace(void);
  56
  57 /*******************************************************************************
  58  *
  59  * FUNCTION:    acpi_load_tables
  60  *
  61  * PARAMETERS:  None
  62  *
  63  * RETURN:      Status
  64  *
  65  * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT
  66  *
  67  ******************************************************************************/
  68
  69 acpi_status __init acpi_load_tables(void)
  70 {
  71         acpi_status status;
  72
  73         ACPI_FUNCTION_TRACE(acpi_load_tables);
  74
  75         /* Load the namespace from the tables */
  76
  77         status = acpi_tb_load_namespace();
  78         if (ACPI_FAILURE(status)) {
  79                 ACPI_EXCEPTION((AE_INFO, status,
  80                                 "While loading namespace from ACPI tables"));
  81         }
  82
  83         return_ACPI_STATUS(status);
  84 }
  85
  86 ACPI_EXPORT_SYMBOL_INIT(acpi_load_tables)
  87
  88 /*******************************************************************************
  89  *
  90  * FUNCTION:    acpi_tb_load_namespace
  91  *
  92  * PARAMETERS:  None
  93  *
  94  * RETURN:      Status
  95  *
  96  * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in
  97  *              the RSDT/XSDT.
  98  *
  99  ******************************************************************************/
 100 static acpi_status acpi_tb_load_namespace(void)
 101 {
 102         acpi_status status;
 103         u32 i;
 104         struct acpi_table_header *new_dsdt;
 105
 106         ACPI_FUNCTION_TRACE(tb_load_namespace);
 107
 108         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 109
 110         /*
 111          * Load the namespace. The DSDT is required, but any SSDT and
 112          * PSDT tables are optional. Verify the DSDT.
 113          */
 114         if (!acpi_gbl_root_table_list.current_table_count ||
 115             !ACPI_COMPARE_NAME(&
 116                                (acpi_gbl_root_table_list.
 117                                 tables[ACPI_TABLE_INDEX_DSDT].signature),
 118                                ACPI_SIG_DSDT)
 119             ||
 120             ACPI_FAILURE(acpi_tb_validate_table
 121                          (&acpi_gbl_root_table_list.
 122                           tables[ACPI_TABLE_INDEX_DSDT]))) {
 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 =
 134             acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT].pointer;
 135
 136         /*
 137          * Optionally copy the entire DSDT to local memory (instead of simply
 138          * mapping it.) There are some BIOSs that corrupt or replace the original
 139          * DSDT, creating the need for this option. Default is FALSE, do not copy
 140          * the DSDT.
 141          */
 142         if (acpi_gbl_copy_dsdt_locally) {
 143                 new_dsdt = acpi_tb_copy_dsdt(ACPI_TABLE_INDEX_DSDT);
 144                 if (new_dsdt) {
 145                         acpi_gbl_DSDT = new_dsdt;
 146                 }
 147         }
 148
 149         /*
 150          * Save the original DSDT header for detection of table corruption
 151          * and/or replacement of the DSDT from outside the OS.
 152          */
 153         ACPI_MEMCPY(&acpi_gbl_original_dsdt_header, acpi_gbl_DSDT,
 154                     sizeof(struct acpi_table_header));
 155
 156         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 157
 158         /* Load and parse tables */
 159
 160         status = acpi_ns_load_table(ACPI_TABLE_INDEX_DSDT, acpi_gbl_root_node);
 161         if (ACPI_FAILURE(status)) {
 162                 return_ACPI_STATUS(status);
 163         }
 164
 165         /* Load any SSDT or PSDT tables. Note: Loop leaves tables locked */
 166
 167         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 168         for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
 169                 if (!acpi_gbl_root_table_list.tables[i].address ||
 170                     (!ACPI_COMPARE_NAME
 171                      (&(acpi_gbl_root_table_list.tables[i].signature),
 172                       ACPI_SIG_SSDT)
 173                      &&
 174                      !ACPI_COMPARE_NAME(&
 175                                         (acpi_gbl_root_table_list.tables[i].
 176                                          signature), ACPI_SIG_PSDT))
 177                     ||
 178                     ACPI_FAILURE(acpi_tb_validate_table
 179                                  (&acpi_gbl_root_table_list.tables[i]))) {
 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                 (void)acpi_ns_load_table(i, acpi_gbl_root_node);
 187                 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 188         }
 189
 190         ACPI_INFO((AE_INFO, "All ACPI Tables successfully acquired"));
 191
 192 unlock_and_exit:
 193         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 194         return_ACPI_STATUS(status);
 195 }
 196
 197 /*******************************************************************************
 198  *
 199  * FUNCTION:    acpi_install_table
 200  *
 201  * PARAMETERS:  address             - Address of the ACPI table to be installed.
 202  *              physical            - Whether the address is a physical table
 203  *                                    address or not
 204  *
 205  * RETURN:      Status
 206  *
 207  * DESCRIPTION: Dynamically install an ACPI table.
 208  *              Note: This function should only be invoked after
 209  *                    acpi_initialize_tables() and before acpi_load_tables().
 210  *
 211  ******************************************************************************/
 212
 213 acpi_status __init
 214 acpi_install_table(acpi_physical_address address, u8 physical)
 215 {
 216         acpi_status status;
 217         u8 flags;
 218         u32 table_index;
 219
 220         ACPI_FUNCTION_TRACE(acpi_install_table);
 221
 222         if (physical) {
 223                 flags = ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL;
 224         } else {
 225                 flags = ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL;
 226         }
 227
 228         status = acpi_tb_install_standard_table(address, flags,
 229                                                 FALSE, FALSE, &table_index);
 230
 231         return_ACPI_STATUS(status);
 232 }
 233
 234 ACPI_EXPORT_SYMBOL_INIT(acpi_install_table)
 235
 236 /*******************************************************************************
 237  *
 238  * FUNCTION:    acpi_load_table
 239  *
 240  * PARAMETERS:  table               - Pointer to a buffer containing the ACPI
 241  *                                    table to be loaded.
 242  *
 243  * RETURN:      Status
 244  *
 245  * DESCRIPTION: Dynamically load an ACPI table from the caller's buffer. Must
 246  *              be a valid ACPI table with a valid ACPI table header.
 247  *              Note1: Mainly intended to support hotplug addition of SSDTs.
 248  *              Note2: Does not copy the incoming table. User is responsible
 249  *              to ensure that the table is not deleted or unmapped.
 250  *
 251  ******************************************************************************/
 252 acpi_status acpi_load_table(struct acpi_table_header *table)
 253 {
 254         acpi_status status;
 255         u32 table_index;
 256
 257         ACPI_FUNCTION_TRACE(acpi_load_table);
 258
 259         /* Parameter validation */
 260
 261         if (!table) {
 262                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 263         }
 264
 265         /* Must acquire the interpreter lock during this operation */
 266
 267         status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
 268         if (ACPI_FAILURE(status)) {
 269                 return_ACPI_STATUS(status);
 270         }
 271
 272         /* Install the table and load it into the namespace */
 273
 274         ACPI_INFO((AE_INFO, "Host-directed Dynamic ACPI Table Load:"));
 275         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 276
 277         status = acpi_tb_install_standard_table(ACPI_PTR_TO_PHYSADDR(table),
 278                                                 ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL,
 279                                                 TRUE, FALSE, &table_index);
 280
 281         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 282         if (ACPI_FAILURE(status)) {
 283                 goto unlock_and_exit;
 284         }
 285
 286         /*
 287          * Note: Now table is "INSTALLED", it must be validated before
 288          * using.
 289          */
 290         status =
 291             acpi_tb_validate_table(&acpi_gbl_root_table_list.
 292                                    tables[table_index]);
 293         if (ACPI_FAILURE(status)) {
 294                 goto unlock_and_exit;
 295         }
 296
 297         status = acpi_ns_load_table(table_index, acpi_gbl_root_node);
 298
 299         /* Invoke table handler if present */
 300
 301         if (acpi_gbl_table_handler) {
 302                 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD, table,
 303                                              acpi_gbl_table_handler_context);
 304         }
 305
 306 unlock_and_exit:
 307         (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
 308         return_ACPI_STATUS(status);
 309 }
 310
 311 ACPI_EXPORT_SYMBOL(acpi_load_table)
 312
 313 /*******************************************************************************
 314  *
 315  * FUNCTION:    acpi_unload_parent_table
 316  *
 317  * PARAMETERS:  object              - Handle to any namespace object owned by
 318  *                                    the table to be unloaded
 319  *
 320  * RETURN:      Status
 321  *
 322  * DESCRIPTION: Via any namespace object within an SSDT or OEMx table, unloads
 323  *              the table and deletes all namespace objects associated with
 324  *              that table. Unloading of the DSDT is not allowed.
 325  *              Note: Mainly intended to support hotplug removal of SSDTs.
 326  *
 327  ******************************************************************************/
 328 acpi_status acpi_unload_parent_table(acpi_handle object)
 329 {
 330         struct acpi_namespace_node *node =
 331             ACPI_CAST_PTR(struct acpi_namespace_node, object);
 332         acpi_status status = AE_NOT_EXIST;
 333         acpi_owner_id owner_id;
 334         u32 i;
 335
 336         ACPI_FUNCTION_TRACE(acpi_unload_parent_table);
 337
 338         /* Parameter validation */
 339
 340         if (!object) {
 341                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 342         }
 343
 344         /*
 345          * The node owner_id is currently the same as the parent table ID.
 346          * However, this could change in the future.
 347          */
 348         owner_id = node->owner_id;
 349         if (!owner_id) {
 350
 351                 /* owner_id==0 means DSDT is the owner. DSDT cannot be unloaded */
 352
 353                 return_ACPI_STATUS(AE_TYPE);
 354         }
 355
 356         /* Must acquire the interpreter lock during this operation */
 357
 358         status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
 359         if (ACPI_FAILURE(status)) {
 360                 return_ACPI_STATUS(status);
 361         }
 362
 363         /* Find the table in the global table list */
 364
 365         for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) {
 366                 if (owner_id != acpi_gbl_root_table_list.tables[i].owner_id) {
 367                         continue;
 368                 }
 369
 370                 /*
 371                  * Allow unload of SSDT and OEMx tables only. Do not allow unload
 372                  * of the DSDT. No other types of tables should get here, since
 373                  * only these types can contain AML and thus are the only types
 374                  * that can create namespace objects.
 375                  */
 376                 if (ACPI_COMPARE_NAME
 377                     (acpi_gbl_root_table_list.tables[i].signature.ascii,
 378                      ACPI_SIG_DSDT)) {
 379                         status = AE_TYPE;
 380                         break;
 381                 }
 382
 383                 /* Ensure the table is actually loaded */
 384
 385                 if (!acpi_tb_is_table_loaded(i)) {
 386                         status = AE_NOT_EXIST;
 387                         break;
 388                 }
 389
 390                 /* Invoke table handler if present */
 391
 392                 if (acpi_gbl_table_handler) {
 393                         (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_UNLOAD,
 394                                                      acpi_gbl_root_table_list.
 395                                                      tables[i].pointer,
 396                                                      acpi_gbl_table_handler_context);
 397                 }
 398
 399                 /*
 400                  * Delete all namespace objects owned by this table. Note that
 401                  * these objects can appear anywhere in the namespace by virtue
 402                  * of the AML "Scope" operator. Thus, we need to track ownership
 403                  * by an ID, not simply a position within the hierarchy.
 404                  */
 405                 status = acpi_tb_delete_namespace_by_owner(i);
 406                 if (ACPI_FAILURE(status)) {
 407                         break;
 408                 }
 409
 410                 status = acpi_tb_release_owner_id(i);
 411                 acpi_tb_set_table_loaded_flag(i, FALSE);
 412                 break;
 413         }
 414
 415         (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
 416         return_ACPI_STATUS(status);
 417 }
 418
 419 ACPI_EXPORT_SYMBOL(acpi_unload_parent_table)