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 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)); 194 195 tables_failed++; 196 197 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, 198 "Table [%4.4s:%8.8s] (id FF) - Table namespace load failed\n\n", 199 table->signature.ascii, 200 table->pointer->oem_table_id)); 201 } else { 202 tables_loaded++; 203 } 204 205 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); 206 } 207 208 if (!tables_failed) { 209 ACPI_INFO((AE_INFO, 210 "%u ACPI AML tables successfully acquired and loaded\n", 211 tables_loaded)); 212 } else { 213 ACPI_ERROR((AE_INFO, 214 "%u table load failures, %u successful", 215 tables_failed, tables_loaded)); 216 217 /* Indicate at least one failure */ 218 219 status = AE_CTRL_TERMINATE; 220 } 221 222 unlock_and_exit: 223 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); 224 return_ACPI_STATUS(status); 225 } 226 227 /******************************************************************************* 228 * 229 * FUNCTION: acpi_install_table 230 * 231 * PARAMETERS: address - Address of the ACPI table to be installed. 232 * physical - Whether the address is a physical table 233 * address or not 234 * 235 * RETURN: Status 236 * 237 * DESCRIPTION: Dynamically install an ACPI table. 238 * Note: This function should only be invoked after 239 * acpi_initialize_tables() and before acpi_load_tables(). 240 * 241 ******************************************************************************/ 242 243 acpi_status __init 244 acpi_install_table(acpi_physical_address address, u8 physical) 245 { 246 acpi_status status; 247 u8 flags; 248 u32 table_index; 249 250 ACPI_FUNCTION_TRACE(acpi_install_table); 251 252 if (physical) { 253 flags = ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL; 254 } else { 255 flags = ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL; 256 } 257 258 status = acpi_tb_install_standard_table(address, flags, 259 FALSE, FALSE, &table_index); 260 261 return_ACPI_STATUS(status); 262 } 263 264 ACPI_EXPORT_SYMBOL_INIT(acpi_install_table) 265 266 /******************************************************************************* 267 * 268 * FUNCTION: acpi_load_table 269 * 270 * PARAMETERS: table - Pointer to a buffer containing the ACPI 271 * table to be loaded. 272 * 273 * RETURN: Status 274 * 275 * DESCRIPTION: Dynamically load an ACPI table from the caller's buffer. Must 276 * be a valid ACPI table with a valid ACPI table header. 277 * Note1: Mainly intended to support hotplug addition of SSDTs. 278 * Note2: Does not copy the incoming table. User is responsible 279 * to ensure that the table is not deleted or unmapped. 280 * 281 ******************************************************************************/ 282 acpi_status acpi_load_table(struct acpi_table_header *table) 283 { 284 acpi_status status; 285 u32 table_index; 286 287 ACPI_FUNCTION_TRACE(acpi_load_table); 288 289 /* Parameter validation */ 290 291 if (!table) { 292 return_ACPI_STATUS(AE_BAD_PARAMETER); 293 } 294 295 /* Must acquire the interpreter lock during this operation */ 296 297 status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER); 298 if (ACPI_FAILURE(status)) { 299 return_ACPI_STATUS(status); 300 } 301 302 /* Install the table and load it into the namespace */ 303 304 ACPI_INFO((AE_INFO, "Host-directed Dynamic ACPI Table Load:")); 305 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); 306 307 status = acpi_tb_install_standard_table(ACPI_PTR_TO_PHYSADDR(table), 308 ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL, 309 TRUE, FALSE, &table_index); 310 311 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); 312 if (ACPI_FAILURE(status)) { 313 goto unlock_and_exit; 314 } 315 316 /* 317 * Note: Now table is "INSTALLED", it must be validated before 318 * using. 319 */ 320 status = 321 acpi_tb_validate_table(&acpi_gbl_root_table_list. 322 tables[table_index]); 323 if (ACPI_FAILURE(status)) { 324 goto unlock_and_exit; 325 } 326 327 status = acpi_ns_load_table(table_index, acpi_gbl_root_node); 328 329 /* Invoke table handler if present */ 330 331 if (acpi_gbl_table_handler) { 332 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD, table, 333 acpi_gbl_table_handler_context); 334 } 335 336 unlock_and_exit: 337 (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER); 338 return_ACPI_STATUS(status); 339 } 340 341 ACPI_EXPORT_SYMBOL(acpi_load_table) 342 343 /******************************************************************************* 344 * 345 * FUNCTION: acpi_unload_parent_table 346 * 347 * PARAMETERS: object - Handle to any namespace object owned by 348 * the table to be unloaded 349 * 350 * RETURN: Status 351 * 352 * DESCRIPTION: Via any namespace object within an SSDT or OEMx table, unloads 353 * the table and deletes all namespace objects associated with 354 * that table. Unloading of the DSDT is not allowed. 355 * Note: Mainly intended to support hotplug removal of SSDTs. 356 * 357 ******************************************************************************/ 358 acpi_status acpi_unload_parent_table(acpi_handle object) 359 { 360 struct acpi_namespace_node *node = 361 ACPI_CAST_PTR(struct acpi_namespace_node, object); 362 acpi_status status = AE_NOT_EXIST; 363 acpi_owner_id owner_id; 364 u32 i; 365 366 ACPI_FUNCTION_TRACE(acpi_unload_parent_table); 367 368 /* Parameter validation */ 369 370 if (!object) { 371 return_ACPI_STATUS(AE_BAD_PARAMETER); 372 } 373 374 /* 375 * The node owner_id is currently the same as the parent table ID. 376 * However, this could change in the future. 377 */ 378 owner_id = node->owner_id; 379 if (!owner_id) { 380 381 /* owner_id==0 means DSDT is the owner. DSDT cannot be unloaded */ 382 383 return_ACPI_STATUS(AE_TYPE); 384 } 385 386 /* Must acquire the interpreter lock during this operation */ 387 388 status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER); 389 if (ACPI_FAILURE(status)) { 390 return_ACPI_STATUS(status); 391 } 392 393 /* Find the table in the global table list */ 394 395 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) { 396 if (owner_id != acpi_gbl_root_table_list.tables[i].owner_id) { 397 continue; 398 } 399 400 /* 401 * Allow unload of SSDT and OEMx tables only. Do not allow unload 402 * of the DSDT. No other types of tables should get here, since 403 * only these types can contain AML and thus are the only types 404 * that can create namespace objects. 405 */ 406 if (ACPI_COMPARE_NAME 407 (acpi_gbl_root_table_list.tables[i].signature.ascii, 408 ACPI_SIG_DSDT)) { 409 status = AE_TYPE; 410 break; 411 } 412 413 /* Ensure the table is actually loaded */ 414 415 if (!acpi_tb_is_table_loaded(i)) { 416 status = AE_NOT_EXIST; 417 break; 418 } 419 420 /* Invoke table handler if present */ 421 422 if (acpi_gbl_table_handler) { 423 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_UNLOAD, 424 acpi_gbl_root_table_list. 425 tables[i].pointer, 426 acpi_gbl_table_handler_context); 427 } 428 429 /* 430 * Delete all namespace objects owned by this table. Note that 431 * these objects can appear anywhere in the namespace by virtue 432 * of the AML "Scope" operator. Thus, we need to track ownership 433 * by an ID, not simply a position within the hierarchy. 434 */ 435 status = acpi_tb_delete_namespace_by_owner(i); 436 if (ACPI_FAILURE(status)) { 437 break; 438 } 439 440 status = acpi_tb_release_owner_id(i); 441 acpi_tb_set_table_loaded_flag(i, FALSE); 442 break; 443 } 444 445 (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER); 446 return_ACPI_STATUS(status); 447 } 448 449 ACPI_EXPORT_SYMBOL(acpi_unload_parent_table) 450