drivers/acpi/acpica/tbxfload.c

   1 /******************************************************************************
   2  *
   3  * Module Name: tbxfload - Table load/unload external interfaces
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2013, 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 #include <linux/export.h>
  45 #include <acpi/acpi.h>
  46 #include "accommon.h"
  47 #include "acnamesp.h"
  48 #include "actables.h"
  49
  50 #define _COMPONENT          ACPI_TABLES
  51 ACPI_MODULE_NAME("tbxfload")
  52
  53 /* Local prototypes */
  54 static acpi_status acpi_tb_load_namespace(void);
  55
  56 /*******************************************************************************
  57  *
  58  * FUNCTION:    acpi_load_tables
  59  *
  60  * PARAMETERS:  None
  61  *
  62  * RETURN:      Status
  63  *
  64  * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT
  65  *
  66  ******************************************************************************/
  67
  68 acpi_status acpi_load_tables(void)
  69 {
  70         acpi_status status;
  71
  72         ACPI_FUNCTION_TRACE(acpi_load_tables);
  73
  74         /* Load the namespace from the tables */
  75
  76         status = acpi_tb_load_namespace();
  77         if (ACPI_FAILURE(status)) {
  78                 ACPI_EXCEPTION((AE_INFO, status,
  79                                 "While loading namespace from ACPI tables"));
  80         }
  81
  82         return_ACPI_STATUS(status);
  83 }
  84
  85 ACPI_EXPORT_SYMBOL(acpi_load_tables)
  86
  87 /*******************************************************************************
  88  *
  89  * FUNCTION:    acpi_tb_load_namespace
  90  *
  91  * PARAMETERS:  None
  92  *
  93  * RETURN:      Status
  94  *
  95  * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in
  96  *              the RSDT/XSDT.
  97  *
  98  ******************************************************************************/
  99 static acpi_status acpi_tb_load_namespace(void)
 100 {
 101         acpi_status status;
 102         u32 i;
 103         struct acpi_table_header *new_dsdt;
 104
 105         ACPI_FUNCTION_TRACE(tb_load_namespace);
 106
 107         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 108
 109         /*
 110          * Load the namespace. The DSDT is required, but any SSDT and
 111          * PSDT tables are optional. Verify the DSDT.
 112          */
 113         if (!acpi_gbl_root_table_list.current_table_count ||
 114             !ACPI_COMPARE_NAME(&
 115                                (acpi_gbl_root_table_list.
 116                                 tables[ACPI_TABLE_INDEX_DSDT].signature),
 117                                ACPI_SIG_DSDT)
 118             ||
 119             ACPI_FAILURE(acpi_tb_verify_table
 120                          (&acpi_gbl_root_table_list.
 121                           tables[ACPI_TABLE_INDEX_DSDT]))) {
 122                 status = AE_NO_ACPI_TABLES;
 123                 goto unlock_and_exit;
 124         }
 125
 126         /*
 127          * Save the DSDT pointer for simple access. This is the mapped memory
 128          * address. We must take care here because the address of the .Tables
 129          * array can change dynamically as tables are loaded at run-time. Note:
 130          * .Pointer field is not validated until after call to acpi_tb_verify_table.
 131          */
 132         acpi_gbl_DSDT =
 133             acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT].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_TABLE_INDEX_DSDT);
 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         ACPI_MEMCPY(&acpi_gbl_original_dsdt_header, acpi_gbl_DSDT,
 153                     sizeof(struct acpi_table_header));
 154
 155         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 156
 157         /* Load and parse tables */
 158
 159         status = acpi_ns_load_table(ACPI_TABLE_INDEX_DSDT, acpi_gbl_root_node);
 160         if (ACPI_FAILURE(status)) {
 161                 return_ACPI_STATUS(status);
 162         }
 163
 164         /* Load any SSDT or PSDT tables. Note: Loop leaves tables locked */
 165
 166         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 167         for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
 168                 if ((!ACPI_COMPARE_NAME
 169                      (&(acpi_gbl_root_table_list.tables[i].signature),
 170                       ACPI_SIG_SSDT)
 171                      &&
 172                      !ACPI_COMPARE_NAME(&
 173                                         (acpi_gbl_root_table_list.tables[i].
 174                                          signature), ACPI_SIG_PSDT))
 175                     ||
 176                     ACPI_FAILURE(acpi_tb_verify_table
 177                                  (&acpi_gbl_root_table_list.tables[i]))) {
 178                         continue;
 179                 }
 180
 181                 /*
 182                  * Optionally do not load any SSDTs from the RSDT/XSDT. This can
 183                  * be useful for debugging ACPI problems on some machines.
 184                  */
 185                 if (acpi_gbl_disable_ssdt_table_load) {
 186                         ACPI_INFO((AE_INFO, "Ignoring %4.4s at %8.8X%8.8X",
 187                                    acpi_gbl_root_table_list.tables[i].signature.
 188                                    ascii, ACPI_FORMAT_UINT64(acpi_gbl_root_table_list.
 189                                                              tables[i].address)));
 190                         continue;
 191                 }
 192
 193                 /* Ignore errors while loading tables, get as many as possible */
 194
 195                 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 196                 (void)acpi_ns_load_table(i, acpi_gbl_root_node);
 197                 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 198         }
 199
 200         ACPI_INFO((AE_INFO, "All ACPI Tables successfully acquired"));
 201
 202       unlock_and_exit:
 203         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 204         return_ACPI_STATUS(status);
 205 }
 206
 207 /*******************************************************************************
 208  *
 209  * FUNCTION:    acpi_load_table
 210  *
 211  * PARAMETERS:  table               - Pointer to a buffer containing the ACPI
 212  *                                    table to be loaded.
 213  *
 214  * RETURN:      Status
 215  *
 216  * DESCRIPTION: Dynamically load an ACPI table from the caller's buffer. Must
 217  *              be a valid ACPI table with a valid ACPI table header.
 218  *              Note1: Mainly intended to support hotplug addition of SSDTs.
 219  *              Note2: Does not copy the incoming table. User is responsible
 220  *              to ensure that the table is not deleted or unmapped.
 221  *
 222  ******************************************************************************/
 223
 224 acpi_status acpi_load_table(struct acpi_table_header *table)
 225 {
 226         acpi_status status;
 227         struct acpi_table_desc table_desc;
 228         u32 table_index;
 229
 230         ACPI_FUNCTION_TRACE(acpi_load_table);
 231
 232         /* Parameter validation */
 233
 234         if (!table) {
 235                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 236         }
 237
 238         /* Init local table descriptor */
 239
 240         ACPI_MEMSET(&table_desc, 0, sizeof(struct acpi_table_desc));
 241         table_desc.address = ACPI_PTR_TO_PHYSADDR(table);
 242         table_desc.pointer = table;
 243         table_desc.length = table->length;
 244         table_desc.flags = ACPI_TABLE_ORIGIN_UNKNOWN;
 245
 246         /* Must acquire the interpreter lock during this operation */
 247
 248         status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
 249         if (ACPI_FAILURE(status)) {
 250                 return_ACPI_STATUS(status);
 251         }
 252
 253         /* Install the table and load it into the namespace */
 254
 255         ACPI_INFO((AE_INFO, "Host-directed Dynamic ACPI Table Load:"));
 256         status = acpi_tb_add_table(&table_desc, &table_index);
 257         if (ACPI_FAILURE(status)) {
 258                 goto unlock_and_exit;
 259         }
 260
 261         status = acpi_ns_load_table(table_index, acpi_gbl_root_node);
 262
 263         /* Invoke table handler if present */
 264
 265         if (acpi_gbl_table_handler) {
 266                 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD, table,
 267                                              acpi_gbl_table_handler_context);
 268         }
 269
 270       unlock_and_exit:
 271         (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
 272         return_ACPI_STATUS(status);
 273 }
 274
 275 ACPI_EXPORT_SYMBOL(acpi_load_table)
 276
 277 /*******************************************************************************
 278  *
 279  * FUNCTION:    acpi_unload_parent_table
 280  *
 281  * PARAMETERS:  object              - Handle to any namespace object owned by
 282  *                                    the table to be unloaded
 283  *
 284  * RETURN:      Status
 285  *
 286  * DESCRIPTION: Via any namespace object within an SSDT or OEMx table, unloads
 287  *              the table and deletes all namespace objects associated with
 288  *              that table. Unloading of the DSDT is not allowed.
 289  *              Note: Mainly intended to support hotplug removal of SSDTs.
 290  *
 291  ******************************************************************************/
 292 acpi_status acpi_unload_parent_table(acpi_handle object)
 293 {
 294         struct acpi_namespace_node *node =
 295             ACPI_CAST_PTR(struct acpi_namespace_node, object);
 296         acpi_status status = AE_NOT_EXIST;
 297         acpi_owner_id owner_id;
 298         u32 i;
 299
 300         ACPI_FUNCTION_TRACE(acpi_unload_parent_table);
 301
 302         /* Parameter validation */
 303
 304         if (!object) {
 305                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 306         }
 307
 308         /*
 309          * The node owner_id is currently the same as the parent table ID.
 310          * However, this could change in the future.
 311          */
 312         owner_id = node->owner_id;
 313         if (!owner_id) {
 314
 315                 /* owner_id==0 means DSDT is the owner. DSDT cannot be unloaded */
 316
 317                 return_ACPI_STATUS(AE_TYPE);
 318         }
 319
 320         /* Must acquire the interpreter lock during this operation */
 321
 322         status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
 323         if (ACPI_FAILURE(status)) {
 324                 return_ACPI_STATUS(status);
 325         }
 326
 327         /* Find the table in the global table list */
 328
 329         for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) {
 330                 if (owner_id != acpi_gbl_root_table_list.tables[i].owner_id) {
 331                         continue;
 332                 }
 333
 334                 /*
 335                  * Allow unload of SSDT and OEMx tables only. Do not allow unload
 336                  * of the DSDT. No other types of tables should get here, since
 337                  * only these types can contain AML and thus are the only types
 338                  * that can create namespace objects.
 339                  */
 340                 if (ACPI_COMPARE_NAME
 341                     (acpi_gbl_root_table_list.tables[i].signature.ascii,
 342                      ACPI_SIG_DSDT)) {
 343                         status = AE_TYPE;
 344                         break;
 345                 }
 346
 347                 /* Ensure the table is actually loaded */
 348
 349                 if (!acpi_tb_is_table_loaded(i)) {
 350                         status = AE_NOT_EXIST;
 351                         break;
 352                 }
 353
 354                 /* Invoke table handler if present */
 355
 356                 if (acpi_gbl_table_handler) {
 357                         (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_UNLOAD,
 358                                                      acpi_gbl_root_table_list.
 359                                                      tables[i].pointer,
 360                                                      acpi_gbl_table_handler_context);
 361                 }
 362
 363                 /*
 364                  * Delete all namespace objects owned by this table. Note that
 365                  * these objects can appear anywhere in the namespace by virtue
 366                  * of the AML "Scope" operator. Thus, we need to track ownership
 367                  * by an ID, not simply a position within the hierarchy.
 368                  */
 369                 status = acpi_tb_delete_namespace_by_owner(i);
 370                 if (ACPI_FAILURE(status)) {
 371                         break;
 372                 }
 373
 374                 status = acpi_tb_release_owner_id(i);
 375                 acpi_tb_set_table_loaded_flag(i, FALSE);
 376                 break;
 377         }
 378
 379         (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
 380         return_ACPI_STATUS(status);
 381 }
 382
 383 ACPI_EXPORT_SYMBOL(acpi_unload_parent_table)