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