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 #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_verify_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_verify_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_COMPARE_NAME
 170                      (&(acpi_gbl_root_table_list.tables[i].signature),
 171                       ACPI_SIG_SSDT)
 172                      &&
 173                      !ACPI_COMPARE_NAME(&
 174                                         (acpi_gbl_root_table_list.tables[i].
 175                                          signature), ACPI_SIG_PSDT))
 176                     ||
 177                     ACPI_FAILURE(acpi_tb_verify_table
 178                                  (&acpi_gbl_root_table_list.tables[i]))) {
 179                         continue;
 180                 }
 181
 182                 /*
 183                  * Optionally do not load any SSDTs from the RSDT/XSDT. This can
 184                  * be useful for debugging ACPI problems on some machines.
 185                  */
 186                 if (acpi_gbl_disable_ssdt_table_load) {
 187                         ACPI_INFO((AE_INFO, "Ignoring %4.4s at %p",
 188                                    acpi_gbl_root_table_list.tables[i].signature.
 189                                    ascii, ACPI_CAST_PTR(void,
 190                                                         acpi_gbl_root_table_list.
 191                                                         tables[i].address)));
 192                         continue;
 193                 }
 194
 195                 /* Ignore errors while loading tables, get as many as possible */
 196
 197                 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 198                 (void)acpi_ns_load_table(i, acpi_gbl_root_node);
 199                 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 200         }
 201
 202         ACPI_INFO((AE_INFO, "All ACPI Tables successfully acquired"));
 203
 204 unlock_and_exit:
 205         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 206         return_ACPI_STATUS(status);
 207 }
 208
 209 /*******************************************************************************
 210  *
 211  * FUNCTION:    acpi_load_table
 212  *
 213  * PARAMETERS:  table               - Pointer to a buffer containing the ACPI
 214  *                                    table to be loaded.
 215  *
 216  * RETURN:      Status
 217  *
 218  * DESCRIPTION: Dynamically load an ACPI table from the caller's buffer. Must
 219  *              be a valid ACPI table with a valid ACPI table header.
 220  *              Note1: Mainly intended to support hotplug addition of SSDTs.
 221  *              Note2: Does not copy the incoming table. User is responsible
 222  *              to ensure that the table is not deleted or unmapped.
 223  *
 224  ******************************************************************************/
 225
 226 acpi_status acpi_load_table(struct acpi_table_header *table)
 227 {
 228         acpi_status status;
 229         struct acpi_table_desc table_desc;
 230         u32 table_index;
 231
 232         ACPI_FUNCTION_TRACE(acpi_load_table);
 233
 234         /* Parameter validation */
 235
 236         if (!table) {
 237                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 238         }
 239
 240         /* Init local table descriptor */
 241
 242         ACPI_MEMSET(&table_desc, 0, sizeof(struct acpi_table_desc));
 243         table_desc.address = ACPI_PTR_TO_PHYSADDR(table);
 244         table_desc.pointer = table;
 245         table_desc.length = table->length;
 246         table_desc.flags = ACPI_TABLE_ORIGIN_UNKNOWN;
 247
 248         /* Must acquire the interpreter lock during this operation */
 249
 250         status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
 251         if (ACPI_FAILURE(status)) {
 252                 return_ACPI_STATUS(status);
 253         }
 254
 255         /* Install the table and load it into the namespace */
 256
 257         ACPI_INFO((AE_INFO, "Host-directed Dynamic ACPI Table Load:"));
 258         status = acpi_tb_add_table(&table_desc, &table_index);
 259         if (ACPI_FAILURE(status)) {
 260                 goto unlock_and_exit;
 261         }
 262
 263         status = acpi_ns_load_table(table_index, acpi_gbl_root_node);
 264
 265         /* Invoke table handler if present */
 266
 267         if (acpi_gbl_table_handler) {
 268                 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD, table,
 269                                              acpi_gbl_table_handler_context);
 270         }
 271
 272 unlock_and_exit:
 273         (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
 274         return_ACPI_STATUS(status);
 275 }
 276
 277 ACPI_EXPORT_SYMBOL(acpi_load_table)
 278
 279 /*******************************************************************************
 280  *
 281  * FUNCTION:    acpi_unload_parent_table
 282  *
 283  * PARAMETERS:  object              - Handle to any namespace object owned by
 284  *                                    the table to be unloaded
 285  *
 286  * RETURN:      Status
 287  *
 288  * DESCRIPTION: Via any namespace object within an SSDT or OEMx table, unloads
 289  *              the table and deletes all namespace objects associated with
 290  *              that table. Unloading of the DSDT is not allowed.
 291  *              Note: Mainly intended to support hotplug removal of SSDTs.
 292  *
 293  ******************************************************************************/
 294 acpi_status acpi_unload_parent_table(acpi_handle object)
 295 {
 296         struct acpi_namespace_node *node =
 297             ACPI_CAST_PTR(struct acpi_namespace_node, object);
 298         acpi_status status = AE_NOT_EXIST;
 299         acpi_owner_id owner_id;
 300         u32 i;
 301
 302         ACPI_FUNCTION_TRACE(acpi_unload_parent_table);
 303
 304         /* Parameter validation */
 305
 306         if (!object) {
 307                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 308         }
 309
 310         /*
 311          * The node owner_id is currently the same as the parent table ID.
 312          * However, this could change in the future.
 313          */
 314         owner_id = node->owner_id;
 315         if (!owner_id) {
 316
 317                 /* owner_id==0 means DSDT is the owner. DSDT cannot be unloaded */
 318
 319                 return_ACPI_STATUS(AE_TYPE);
 320         }
 321
 322         /* Must acquire the interpreter lock during this operation */
 323
 324         status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
 325         if (ACPI_FAILURE(status)) {
 326                 return_ACPI_STATUS(status);
 327         }
 328
 329         /* Find the table in the global table list */
 330
 331         for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) {
 332                 if (owner_id != acpi_gbl_root_table_list.tables[i].owner_id) {
 333                         continue;
 334                 }
 335
 336                 /*
 337                  * Allow unload of SSDT and OEMx tables only. Do not allow unload
 338                  * of the DSDT. No other types of tables should get here, since
 339                  * only these types can contain AML and thus are the only types
 340                  * that can create namespace objects.
 341                  */
 342                 if (ACPI_COMPARE_NAME
 343                     (acpi_gbl_root_table_list.tables[i].signature.ascii,
 344                      ACPI_SIG_DSDT)) {
 345                         status = AE_TYPE;
 346                         break;
 347                 }
 348
 349                 /* Ensure the table is actually loaded */
 350
 351                 if (!acpi_tb_is_table_loaded(i)) {
 352                         status = AE_NOT_EXIST;
 353                         break;
 354                 }
 355
 356                 /* Invoke table handler if present */
 357
 358                 if (acpi_gbl_table_handler) {
 359                         (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_UNLOAD,
 360                                                      acpi_gbl_root_table_list.
 361                                                      tables[i].pointer,
 362                                                      acpi_gbl_table_handler_context);
 363                 }
 364
 365                 /*
 366                  * Delete all namespace objects owned by this table. Note that
 367                  * these objects can appear anywhere in the namespace by virtue
 368                  * of the AML "Scope" operator. Thus, we need to track ownership
 369                  * by an ID, not simply a position within the hierarchy.
 370                  */
 371                 status = acpi_tb_delete_namespace_by_owner(i);
 372                 if (ACPI_FAILURE(status)) {
 373                         break;
 374                 }
 375
 376                 status = acpi_tb_release_owner_id(i);
 377                 acpi_tb_set_table_loaded_flag(i, FALSE);
 378                 break;
 379         }
 380
 381         (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
 382         return_ACPI_STATUS(status);
 383 }
 384
 385 ACPI_EXPORT_SYMBOL(acpi_unload_parent_table)