drivers/acpi/acpica/tbxfload.c

   1 /******************************************************************************
   2  *
   3  * Module Name: tbxfload - Table load/unload external interfaces
   4  *
   5  *****************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2012, 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 static int no_auto_ssdt;
  57
  58 /*******************************************************************************
  59  *
  60  * FUNCTION:    acpi_load_tables
  61  *
  62  * PARAMETERS:  None
  63  *
  64  * RETURN:      Status
  65  *
  66  * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT
  67  *
  68  ******************************************************************************/
  69
  70 acpi_status acpi_load_tables(void)
  71 {
  72         acpi_status status;
  73
  74         ACPI_FUNCTION_TRACE(acpi_load_tables);
  75
  76         /* Load the namespace from the tables */
  77
  78         status = acpi_tb_load_namespace();
  79         if (ACPI_FAILURE(status)) {
  80                 ACPI_EXCEPTION((AE_INFO, status,
  81                                 "While loading namespace from ACPI tables"));
  82         }
  83
  84         return_ACPI_STATUS(status);
  85 }
  86
  87 ACPI_EXPORT_SYMBOL(acpi_load_tables)
  88
  89 /*******************************************************************************
  90  *
  91  * FUNCTION:    acpi_tb_load_namespace
  92  *
  93  * PARAMETERS:  None
  94  *
  95  * RETURN:      Status
  96  *
  97  * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in
  98  *              the RSDT/XSDT.
  99  *
 100  ******************************************************************************/
 101 static acpi_status acpi_tb_load_namespace(void)
 102 {
 103         acpi_status status;
 104         u32 i;
 105         struct acpi_table_header *new_dsdt;
 106
 107         ACPI_FUNCTION_TRACE(tb_load_namespace);
 108
 109         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 110
 111         /*
 112          * Load the namespace. The DSDT is required, but any SSDT and
 113          * PSDT tables are optional. Verify the DSDT.
 114          */
 115         if (!acpi_gbl_root_table_list.current_table_count ||
 116             !ACPI_COMPARE_NAME(&
 117                                (acpi_gbl_root_table_list.
 118                                 tables[ACPI_TABLE_INDEX_DSDT].signature),
 119                                ACPI_SIG_DSDT)
 120             ||
 121             ACPI_FAILURE(acpi_tb_verify_table
 122                          (&acpi_gbl_root_table_list.
 123                           tables[ACPI_TABLE_INDEX_DSDT]))) {
 124                 status = AE_NO_ACPI_TABLES;
 125                 goto unlock_and_exit;
 126         }
 127
 128         /*
 129          * Save the DSDT pointer for simple access. This is the mapped memory
 130          * address. We must take care here because the address of the .Tables
 131          * array can change dynamically as tables are loaded at run-time. Note:
 132          * .Pointer field is not validated until after call to acpi_tb_verify_table.
 133          */
 134         acpi_gbl_DSDT =
 135             acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT].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_TABLE_INDEX_DSDT);
 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         ACPI_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_TABLE_INDEX_DSDT, acpi_gbl_root_node);
 162         if (ACPI_FAILURE(status)) {
 163                 return_ACPI_STATUS(status);
 164         }
 165
 166         /* Load any SSDT or PSDT tables. Note: Loop leaves tables locked */
 167
 168         (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 169         for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) {
 170                 if ((!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_verify_table
 179                                  (&acpi_gbl_root_table_list.tables[i]))) {
 180                         continue;
 181                 }
 182
 183                 if (no_auto_ssdt) {
 184                         printk(KERN_WARNING "ACPI: SSDT ignored due to \"acpi_no_auto_ssdt\"\n");
 185                         continue;
 186                 }
 187
 188                 /* Ignore errors while loading tables, get as many as possible */
 189
 190                 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 191                 (void)acpi_ns_load_table(i, acpi_gbl_root_node);
 192                 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES);
 193         }
 194
 195         ACPI_DEBUG_PRINT((ACPI_DB_INIT, "ACPI Tables successfully acquired\n"));
 196
 197       unlock_and_exit:
 198         (void)acpi_ut_release_mutex(ACPI_MTX_TABLES);
 199         return_ACPI_STATUS(status);
 200 }
 201
 202 /*******************************************************************************
 203  *
 204  * FUNCTION:    acpi_load_table
 205  *
 206  * PARAMETERS:  table               - Pointer to a buffer containing the ACPI
 207  *                                    table to be loaded.
 208  *
 209  * RETURN:      Status
 210  *
 211  * DESCRIPTION: Dynamically load an ACPI table from the caller's buffer. Must
 212  *              be a valid ACPI table with a valid ACPI table header.
 213  *              Note1: Mainly intended to support hotplug addition of SSDTs.
 214  *              Note2: Does not copy the incoming table. User is reponsible
 215  *              to ensure that the table is not deleted or unmapped.
 216  *
 217  ******************************************************************************/
 218
 219 acpi_status acpi_load_table(struct acpi_table_header *table)
 220 {
 221         acpi_status status;
 222         struct acpi_table_desc table_desc;
 223         u32 table_index;
 224
 225         ACPI_FUNCTION_TRACE(acpi_load_table);
 226
 227         /* Parameter validation */
 228
 229         if (!table) {
 230                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 231         }
 232
 233         /* Init local table descriptor */
 234
 235         ACPI_MEMSET(&table_desc, 0, sizeof(struct acpi_table_desc));
 236         table_desc.address = ACPI_PTR_TO_PHYSADDR(table);
 237         table_desc.pointer = table;
 238         table_desc.length = table->length;
 239         table_desc.flags = ACPI_TABLE_ORIGIN_UNKNOWN;
 240
 241         /* Must acquire the interpreter lock during this operation */
 242
 243         status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
 244         if (ACPI_FAILURE(status)) {
 245                 return_ACPI_STATUS(status);
 246         }
 247
 248         /* Install the table and load it into the namespace */
 249
 250         ACPI_INFO((AE_INFO, "Host-directed Dynamic ACPI Table Load:"));
 251         status = acpi_tb_add_table(&table_desc, &table_index);
 252         if (ACPI_FAILURE(status)) {
 253                 goto unlock_and_exit;
 254         }
 255
 256         status = acpi_ns_load_table(table_index, acpi_gbl_root_node);
 257
 258         /* Invoke table handler if present */
 259
 260         if (acpi_gbl_table_handler) {
 261                 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD, table,
 262                                              acpi_gbl_table_handler_context);
 263         }
 264
 265       unlock_and_exit:
 266         (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
 267         return_ACPI_STATUS(status);
 268 }
 269
 270 ACPI_EXPORT_SYMBOL(acpi_load_table)
 271
 272 /*******************************************************************************
 273  *
 274  * FUNCTION:    acpi_unload_parent_table
 275  *
 276  * PARAMETERS:  object              - Handle to any namespace object owned by
 277  *                                    the table to be unloaded
 278  *
 279  * RETURN:      Status
 280  *
 281  * DESCRIPTION: Via any namespace object within an SSDT or OEMx table, unloads
 282  *              the table and deletes all namespace objects associated with
 283  *              that table. Unloading of the DSDT is not allowed.
 284  *              Note: Mainly intended to support hotplug removal of SSDTs.
 285  *
 286  ******************************************************************************/
 287 acpi_status acpi_unload_parent_table(acpi_handle object)
 288 {
 289         struct acpi_namespace_node *node =
 290             ACPI_CAST_PTR(struct acpi_namespace_node, object);
 291         acpi_status status = AE_NOT_EXIST;
 292         acpi_owner_id owner_id;
 293         u32 i;
 294
 295         ACPI_FUNCTION_TRACE(acpi_unload_parent_table);
 296
 297         /* Parameter validation */
 298
 299         if (!object) {
 300                 return_ACPI_STATUS(AE_BAD_PARAMETER);
 301         }
 302
 303         /*
 304          * The node owner_id is currently the same as the parent table ID.
 305          * However, this could change in the future.
 306          */
 307         owner_id = node->owner_id;
 308         if (!owner_id) {
 309
 310                 /* owner_id==0 means DSDT is the owner. DSDT cannot be unloaded */
 311
 312                 return_ACPI_STATUS(AE_TYPE);
 313         }
 314
 315         /* Must acquire the interpreter lock during this operation */
 316
 317         status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER);
 318         if (ACPI_FAILURE(status)) {
 319                 return_ACPI_STATUS(status);
 320         }
 321
 322         /* Find the table in the global table list */
 323
 324         for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) {
 325                 if (owner_id != acpi_gbl_root_table_list.tables[i].owner_id) {
 326                         continue;
 327                 }
 328
 329                 /*
 330                  * Allow unload of SSDT and OEMx tables only. Do not allow unload
 331                  * of the DSDT. No other types of tables should get here, since
 332                  * only these types can contain AML and thus are the only types
 333                  * that can create namespace objects.
 334                  */
 335                 if (ACPI_COMPARE_NAME
 336                     (acpi_gbl_root_table_list.tables[i].signature.ascii,
 337                      ACPI_SIG_DSDT)) {
 338                         status = AE_TYPE;
 339                         break;
 340                 }
 341
 342                 /* Ensure the table is actually loaded */
 343
 344                 if (!acpi_tb_is_table_loaded(i)) {
 345                         status = AE_NOT_EXIST;
 346                         break;
 347                 }
 348
 349                 /* Invoke table handler if present */
 350
 351                 if (acpi_gbl_table_handler) {
 352                         (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_UNLOAD,
 353                                                      acpi_gbl_root_table_list.
 354                                                      tables[i].pointer,
 355                                                      acpi_gbl_table_handler_context);
 356                 }
 357
 358                 /*
 359                  * Delete all namespace objects owned by this table. Note that
 360                  * these objects can appear anywhere in the namespace by virtue
 361                  * of the AML "Scope" operator. Thus, we need to track ownership
 362                  * by an ID, not simply a position within the hierarchy.
 363                  */
 364                 status = acpi_tb_delete_namespace_by_owner(i);
 365                 if (ACPI_FAILURE(status)) {
 366                         break;
 367                 }
 368
 369                 status = acpi_tb_release_owner_id(i);
 370                 acpi_tb_set_table_loaded_flag(i, FALSE);
 371                 break;
 372         }
 373
 374         (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER);
 375         return_ACPI_STATUS(status);
 376 }
 377
 378 ACPI_EXPORT_SYMBOL(acpi_unload_parent_table)
 379
 380 static int __init acpi_no_auto_ssdt_setup(char *s) {
 381
 382         printk(KERN_NOTICE "ACPI: SSDT auto-load disabled\n");
 383
 384         no_auto_ssdt = 1;
 385
 386         return 1;
 387 }
 388
 389 __setup("acpi_no_auto_ssdt", acpi_no_auto_ssdt_setup);