1 /****************************************************************************** 2 * 3 * Module Name: tbxfload - Table load/unload external interfaces 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2016, 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 #include "acevents.h" 51 52 #define _COMPONENT ACPI_TABLES 53 ACPI_MODULE_NAME("tbxfload") 54 55 /******************************************************************************* 56 * 57 * FUNCTION: acpi_load_tables 58 * 59 * PARAMETERS: None 60 * 61 * RETURN: Status 62 * 63 * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT 64 * 65 ******************************************************************************/ 66 acpi_status __init acpi_load_tables(void) 67 { 68 acpi_status status; 69 70 ACPI_FUNCTION_TRACE(acpi_load_tables); 71 72 /* 73 * Install the default operation region handlers. These are the 74 * handlers that are defined by the ACPI specification to be 75 * "always accessible" -- namely, system_memory, system_IO, and 76 * PCI_Config. This also means that no _REG methods need to be 77 * run for these address spaces. We need to have these handlers 78 * installed before any AML code can be executed, especially any 79 * module-level code (11/2015). 80 * Note that we allow OSPMs to install their own region handlers 81 * between acpi_initialize_subsystem() and acpi_load_tables() to use 82 * their customized default region handlers. 83 */ 84 status = acpi_ev_install_region_handlers(); 85 if (ACPI_FAILURE(status)) { 86 ACPI_EXCEPTION((AE_INFO, status, 87 "During Region initialization")); 88 return_ACPI_STATUS(status); 89 } 90 91 /* Load the namespace from the tables */ 92 93 status = acpi_tb_load_namespace(); 94 95 /* Don't let single failures abort the load */ 96 97 if (status == AE_CTRL_TERMINATE) { 98 status = AE_OK; 99 } 100 101 if (ACPI_FAILURE(status)) { 102 ACPI_EXCEPTION((AE_INFO, status, 103 "While loading namespace from ACPI tables")); 104 } 105 106 if (!acpi_gbl_group_module_level_code) { 107 /* 108 * Initialize the objects that remain uninitialized. This 109 * runs the executable AML that may be part of the 110 * declaration of these objects: 111 * operation_regions, buffer_fields, Buffers, and Packages. 112 */ 113 status = acpi_ns_initialize_objects(); 114 if (ACPI_FAILURE(status)) { 115 return_ACPI_STATUS(status); 116 } 117 } 118 119 acpi_gbl_namespace_initialized = TRUE; 120 return_ACPI_STATUS(status); 121 } 122 123 ACPI_EXPORT_SYMBOL_INIT(acpi_load_tables) 124 125 /******************************************************************************* 126 * 127 * FUNCTION: acpi_tb_load_namespace 128 * 129 * PARAMETERS: None 130 * 131 * RETURN: Status 132 * 133 * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in 134 * the RSDT/XSDT. 135 * 136 ******************************************************************************/ 137 acpi_status acpi_tb_load_namespace(void) 138 { 139 acpi_status status; 140 u32 i; 141 struct acpi_table_header *new_dsdt; 142 struct acpi_table_desc *table; 143 u32 tables_loaded = 0; 144 u32 tables_failed = 0; 145 146 ACPI_FUNCTION_TRACE(tb_load_namespace); 147 148 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); 149 150 /* 151 * Load the namespace. The DSDT is required, but any SSDT and 152 * PSDT tables are optional. Verify the DSDT. 153 */ 154 table = &acpi_gbl_root_table_list.tables[acpi_gbl_dsdt_index]; 155 156 if (!acpi_gbl_root_table_list.current_table_count || 157 !ACPI_COMPARE_NAME(table->signature.ascii, ACPI_SIG_DSDT) || 158 ACPI_FAILURE(acpi_tb_validate_table(table))) { 159 status = AE_NO_ACPI_TABLES; 160 goto unlock_and_exit; 161 } 162 163 /* 164 * Save the DSDT pointer for simple access. This is the mapped memory 165 * address. We must take care here because the address of the .Tables 166 * array can change dynamically as tables are loaded at run-time. Note: 167 * .Pointer field is not validated until after call to acpi_tb_validate_table. 168 */ 169 acpi_gbl_DSDT = table->pointer; 170 171 /* 172 * Optionally copy the entire DSDT to local memory (instead of simply 173 * mapping it.) There are some BIOSs that corrupt or replace the original 174 * DSDT, creating the need for this option. Default is FALSE, do not copy 175 * the DSDT. 176 */ 177 if (acpi_gbl_copy_dsdt_locally) { 178 new_dsdt = acpi_tb_copy_dsdt(acpi_gbl_dsdt_index); 179 if (new_dsdt) { 180 acpi_gbl_DSDT = new_dsdt; 181 } 182 } 183 184 /* 185 * Save the original DSDT header for detection of table corruption 186 * and/or replacement of the DSDT from outside the OS. 187 */ 188 memcpy(&acpi_gbl_original_dsdt_header, acpi_gbl_DSDT, 189 sizeof(struct acpi_table_header)); 190 191 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); 192 193 /* Load and parse tables */ 194 195 status = acpi_ns_load_table(acpi_gbl_dsdt_index, acpi_gbl_root_node); 196 if (ACPI_FAILURE(status)) { 197 ACPI_EXCEPTION((AE_INFO, status, "[DSDT] table load failed")); 198 tables_failed++; 199 } else { 200 tables_loaded++; 201 } 202 203 /* Load any SSDT or PSDT tables. Note: Loop leaves tables locked */ 204 205 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); 206 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) { 207 table = &acpi_gbl_root_table_list.tables[i]; 208 209 if (!acpi_gbl_root_table_list.tables[i].address || 210 (!ACPI_COMPARE_NAME(table->signature.ascii, ACPI_SIG_SSDT) 211 && !ACPI_COMPARE_NAME(table->signature.ascii, 212 ACPI_SIG_PSDT) 213 && !ACPI_COMPARE_NAME(table->signature.ascii, 214 ACPI_SIG_OSDT)) 215 || ACPI_FAILURE(acpi_tb_validate_table(table))) { 216 continue; 217 } 218 219 /* Ignore errors while loading tables, get as many as possible */ 220 221 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); 222 status = acpi_ns_load_table(i, acpi_gbl_root_node); 223 if (ACPI_FAILURE(status)) { 224 ACPI_EXCEPTION((AE_INFO, status, 225 "(%4.4s:%8.8s) while loading table", 226 table->signature.ascii, 227 table->pointer->oem_table_id)); 228 229 tables_failed++; 230 231 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, 232 "Table [%4.4s:%8.8s] (id FF) - Table namespace load failed\n\n", 233 table->signature.ascii, 234 table->pointer->oem_table_id)); 235 } else { 236 tables_loaded++; 237 } 238 239 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); 240 } 241 242 if (!tables_failed) { 243 ACPI_INFO(("%u ACPI AML tables successfully acquired and loaded\n", tables_loaded)); 244 } else { 245 ACPI_ERROR((AE_INFO, 246 "%u table load failures, %u successful", 247 tables_failed, tables_loaded)); 248 249 /* Indicate at least one failure */ 250 251 status = AE_CTRL_TERMINATE; 252 } 253 254 unlock_and_exit: 255 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); 256 return_ACPI_STATUS(status); 257 } 258 259 /******************************************************************************* 260 * 261 * FUNCTION: acpi_install_table 262 * 263 * PARAMETERS: address - Address of the ACPI table to be installed. 264 * physical - Whether the address is a physical table 265 * address or not 266 * 267 * RETURN: Status 268 * 269 * DESCRIPTION: Dynamically install an ACPI table. 270 * Note: This function should only be invoked after 271 * acpi_initialize_tables() and before acpi_load_tables(). 272 * 273 ******************************************************************************/ 274 275 acpi_status __init 276 acpi_install_table(acpi_physical_address address, u8 physical) 277 { 278 acpi_status status; 279 u8 flags; 280 u32 table_index; 281 282 ACPI_FUNCTION_TRACE(acpi_install_table); 283 284 if (physical) { 285 flags = ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL; 286 } else { 287 flags = ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL; 288 } 289 290 status = acpi_tb_install_standard_table(address, flags, 291 FALSE, FALSE, &table_index); 292 293 return_ACPI_STATUS(status); 294 } 295 296 ACPI_EXPORT_SYMBOL_INIT(acpi_install_table) 297 298 /******************************************************************************* 299 * 300 * FUNCTION: acpi_load_table 301 * 302 * PARAMETERS: table - Pointer to a buffer containing the ACPI 303 * table to be loaded. 304 * 305 * RETURN: Status 306 * 307 * DESCRIPTION: Dynamically load an ACPI table from the caller's buffer. Must 308 * be a valid ACPI table with a valid ACPI table header. 309 * Note1: Mainly intended to support hotplug addition of SSDTs. 310 * Note2: Does not copy the incoming table. User is responsible 311 * to ensure that the table is not deleted or unmapped. 312 * 313 ******************************************************************************/ 314 acpi_status acpi_load_table(struct acpi_table_header *table) 315 { 316 acpi_status status; 317 u32 table_index; 318 319 ACPI_FUNCTION_TRACE(acpi_load_table); 320 321 /* Parameter validation */ 322 323 if (!table) { 324 return_ACPI_STATUS(AE_BAD_PARAMETER); 325 } 326 327 /* Must acquire the interpreter lock during this operation */ 328 329 status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER); 330 if (ACPI_FAILURE(status)) { 331 return_ACPI_STATUS(status); 332 } 333 334 /* Install the table and load it into the namespace */ 335 336 ACPI_INFO(("Host-directed Dynamic ACPI Table Load:")); 337 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); 338 339 status = acpi_tb_install_standard_table(ACPI_PTR_TO_PHYSADDR(table), 340 ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL, 341 TRUE, FALSE, &table_index); 342 343 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); 344 if (ACPI_FAILURE(status)) { 345 goto unlock_and_exit; 346 } 347 348 /* 349 * Note: Now table is "INSTALLED", it must be validated before 350 * using. 351 */ 352 status = 353 acpi_tb_validate_table(&acpi_gbl_root_table_list. 354 tables[table_index]); 355 if (ACPI_FAILURE(status)) { 356 goto unlock_and_exit; 357 } 358 359 status = acpi_ns_load_table(table_index, acpi_gbl_root_node); 360 361 /* Invoke table handler if present */ 362 363 if (acpi_gbl_table_handler) { 364 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD, table, 365 acpi_gbl_table_handler_context); 366 } 367 368 unlock_and_exit: 369 (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER); 370 return_ACPI_STATUS(status); 371 } 372 373 ACPI_EXPORT_SYMBOL(acpi_load_table) 374 375 /******************************************************************************* 376 * 377 * FUNCTION: acpi_unload_parent_table 378 * 379 * PARAMETERS: object - Handle to any namespace object owned by 380 * the table to be unloaded 381 * 382 * RETURN: Status 383 * 384 * DESCRIPTION: Via any namespace object within an SSDT or OEMx table, unloads 385 * the table and deletes all namespace objects associated with 386 * that table. Unloading of the DSDT is not allowed. 387 * Note: Mainly intended to support hotplug removal of SSDTs. 388 * 389 ******************************************************************************/ 390 acpi_status acpi_unload_parent_table(acpi_handle object) 391 { 392 struct acpi_namespace_node *node = 393 ACPI_CAST_PTR(struct acpi_namespace_node, object); 394 acpi_status status = AE_NOT_EXIST; 395 acpi_owner_id owner_id; 396 u32 i; 397 398 ACPI_FUNCTION_TRACE(acpi_unload_parent_table); 399 400 /* Parameter validation */ 401 402 if (!object) { 403 return_ACPI_STATUS(AE_BAD_PARAMETER); 404 } 405 406 /* 407 * The node owner_id is currently the same as the parent table ID. 408 * However, this could change in the future. 409 */ 410 owner_id = node->owner_id; 411 if (!owner_id) { 412 413 /* owner_id==0 means DSDT is the owner. DSDT cannot be unloaded */ 414 415 return_ACPI_STATUS(AE_TYPE); 416 } 417 418 /* Must acquire the interpreter lock during this operation */ 419 420 status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER); 421 if (ACPI_FAILURE(status)) { 422 return_ACPI_STATUS(status); 423 } 424 425 /* Find the table in the global table list */ 426 427 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) { 428 if (owner_id != acpi_gbl_root_table_list.tables[i].owner_id) { 429 continue; 430 } 431 432 /* 433 * Allow unload of SSDT and OEMx tables only. Do not allow unload 434 * of the DSDT. No other types of tables should get here, since 435 * only these types can contain AML and thus are the only types 436 * that can create namespace objects. 437 */ 438 if (ACPI_COMPARE_NAME 439 (acpi_gbl_root_table_list.tables[i].signature.ascii, 440 ACPI_SIG_DSDT)) { 441 status = AE_TYPE; 442 break; 443 } 444 445 /* Ensure the table is actually loaded */ 446 447 if (!acpi_tb_is_table_loaded(i)) { 448 status = AE_NOT_EXIST; 449 break; 450 } 451 452 /* Invoke table handler if present */ 453 454 if (acpi_gbl_table_handler) { 455 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_UNLOAD, 456 acpi_gbl_root_table_list. 457 tables[i].pointer, 458 acpi_gbl_table_handler_context); 459 } 460 461 /* 462 * Delete all namespace objects owned by this table. Note that 463 * these objects can appear anywhere in the namespace by virtue 464 * of the AML "Scope" operator. Thus, we need to track ownership 465 * by an ID, not simply a position within the hierarchy. 466 */ 467 status = acpi_tb_delete_namespace_by_owner(i); 468 if (ACPI_FAILURE(status)) { 469 break; 470 } 471 472 status = acpi_tb_release_owner_id(i); 473 acpi_tb_set_table_loaded_flag(i, FALSE); 474 break; 475 } 476 477 (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER); 478 return_ACPI_STATUS(status); 479 } 480 481 ACPI_EXPORT_SYMBOL(acpi_unload_parent_table) 482