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 52ACPI_MODULE_NAME("tbxfload") 53 54/* Local prototypes */ 55static 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 69acpi_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 86ACPI_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 ******************************************************************************/ 100static 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 192unlock_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 213acpi_status __init 214acpi_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 234ACPI_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 ******************************************************************************/ 252acpi_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 306unlock_and_exit: 307 (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER); 308 return_ACPI_STATUS(status); 309} 310 311ACPI_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 ******************************************************************************/ 328acpi_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 419ACPI_EXPORT_SYMBOL(acpi_unload_parent_table) 420