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 ACPI_INIT_FUNCTION 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_parse_table_as_term_list 107 || !acpi_gbl_group_module_level_code) { 108 /* 109 * Initialize the objects that remain uninitialized. This 110 * runs the executable AML that may be part of the 111 * declaration of these objects: 112 * operation_regions, buffer_fields, Buffers, and Packages. 113 */ 114 status = acpi_ns_initialize_objects(); 115 if (ACPI_FAILURE(status)) { 116 return_ACPI_STATUS(status); 117 } 118 } 119 120 acpi_gbl_namespace_initialized = TRUE; 121 return_ACPI_STATUS(status); 122 } 123 124 ACPI_EXPORT_SYMBOL_INIT(acpi_load_tables) 125 126 /******************************************************************************* 127 * 128 * FUNCTION: acpi_tb_load_namespace 129 * 130 * PARAMETERS: None 131 * 132 * RETURN: Status 133 * 134 * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in 135 * the RSDT/XSDT. 136 * 137 ******************************************************************************/ 138 acpi_status acpi_tb_load_namespace(void) 139 { 140 acpi_status status; 141 u32 i; 142 struct acpi_table_header *new_dsdt; 143 struct acpi_table_desc *table; 144 u32 tables_loaded = 0; 145 u32 tables_failed = 0; 146 147 ACPI_FUNCTION_TRACE(tb_load_namespace); 148 149 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); 150 151 /* 152 * Load the namespace. The DSDT is required, but any SSDT and 153 * PSDT tables are optional. Verify the DSDT. 154 */ 155 table = &acpi_gbl_root_table_list.tables[acpi_gbl_dsdt_index]; 156 157 if (!acpi_gbl_root_table_list.current_table_count || 158 !ACPI_COMPARE_NAME(table->signature.ascii, ACPI_SIG_DSDT) || 159 ACPI_FAILURE(acpi_tb_validate_table(table))) { 160 status = AE_NO_ACPI_TABLES; 161 goto unlock_and_exit; 162 } 163 164 /* 165 * Save the DSDT pointer for simple access. This is the mapped memory 166 * address. We must take care here because the address of the .Tables 167 * array can change dynamically as tables are loaded at run-time. Note: 168 * .Pointer field is not validated until after call to acpi_tb_validate_table. 169 */ 170 acpi_gbl_DSDT = table->pointer; 171 172 /* 173 * Optionally copy the entire DSDT to local memory (instead of simply 174 * mapping it.) There are some BIOSs that corrupt or replace the original 175 * DSDT, creating the need for this option. Default is FALSE, do not copy 176 * the DSDT. 177 */ 178 if (acpi_gbl_copy_dsdt_locally) { 179 new_dsdt = acpi_tb_copy_dsdt(acpi_gbl_dsdt_index); 180 if (new_dsdt) { 181 acpi_gbl_DSDT = new_dsdt; 182 } 183 } 184 185 /* 186 * Save the original DSDT header for detection of table corruption 187 * and/or replacement of the DSDT from outside the OS. 188 */ 189 memcpy(&acpi_gbl_original_dsdt_header, acpi_gbl_DSDT, 190 sizeof(struct acpi_table_header)); 191 192 /* Load and parse tables */ 193 194 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); 195 status = acpi_ns_load_table(acpi_gbl_dsdt_index, acpi_gbl_root_node); 196 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); 197 if (ACPI_FAILURE(status)) { 198 ACPI_EXCEPTION((AE_INFO, status, "[DSDT] table load failed")); 199 tables_failed++; 200 } else { 201 tables_loaded++; 202 } 203 204 /* Load any SSDT or PSDT tables. Note: Loop leaves tables locked */ 205 206 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 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); 224 if (ACPI_FAILURE(status)) { 225 ACPI_EXCEPTION((AE_INFO, status, 226 "(%4.4s:%8.8s) while loading table", 227 table->signature.ascii, 228 table->pointer->oem_table_id)); 229 230 tables_failed++; 231 232 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, 233 "Table [%4.4s:%8.8s] (id FF) - Table namespace load failed\n\n", 234 table->signature.ascii, 235 table->pointer->oem_table_id)); 236 } else { 237 tables_loaded++; 238 } 239 } 240 241 if (!tables_failed) { 242 ACPI_INFO(("%u ACPI AML tables successfully acquired and loaded\n", tables_loaded)); 243 } else { 244 ACPI_ERROR((AE_INFO, 245 "%u table load failures, %u successful", 246 tables_failed, tables_loaded)); 247 248 /* Indicate at least one failure */ 249 250 status = AE_CTRL_TERMINATE; 251 } 252 253 unlock_and_exit: 254 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); 255 return_ACPI_STATUS(status); 256 } 257 258 /******************************************************************************* 259 * 260 * FUNCTION: acpi_install_table 261 * 262 * PARAMETERS: address - Address of the ACPI table to be installed. 263 * physical - Whether the address is a physical table 264 * address or not 265 * 266 * RETURN: Status 267 * 268 * DESCRIPTION: Dynamically install an ACPI table. 269 * Note: This function should only be invoked after 270 * acpi_initialize_tables() and before acpi_load_tables(). 271 * 272 ******************************************************************************/ 273 274 acpi_status ACPI_INIT_FUNCTION 275 acpi_install_table(acpi_physical_address address, u8 physical) 276 { 277 acpi_status status; 278 u8 flags; 279 u32 table_index; 280 281 ACPI_FUNCTION_TRACE(acpi_install_table); 282 283 if (physical) { 284 flags = ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL; 285 } else { 286 flags = ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL; 287 } 288 289 status = acpi_tb_install_standard_table(address, flags, 290 FALSE, FALSE, &table_index); 291 292 return_ACPI_STATUS(status); 293 } 294 295 ACPI_EXPORT_SYMBOL_INIT(acpi_install_table) 296 297 /******************************************************************************* 298 * 299 * FUNCTION: acpi_load_table 300 * 301 * PARAMETERS: table - Pointer to a buffer containing the ACPI 302 * table to be loaded. 303 * 304 * RETURN: Status 305 * 306 * DESCRIPTION: Dynamically load an ACPI table from the caller's buffer. Must 307 * be a valid ACPI table with a valid ACPI table header. 308 * Note1: Mainly intended to support hotplug addition of SSDTs. 309 * Note2: Does not copy the incoming table. User is responsible 310 * to ensure that the table is not deleted or unmapped. 311 * 312 ******************************************************************************/ 313 acpi_status acpi_load_table(struct acpi_table_header *table) 314 { 315 acpi_status status; 316 u32 table_index; 317 318 ACPI_FUNCTION_TRACE(acpi_load_table); 319 320 /* Parameter validation */ 321 322 if (!table) { 323 return_ACPI_STATUS(AE_BAD_PARAMETER); 324 } 325 326 /* Install the table and load it into the namespace */ 327 328 ACPI_INFO(("Host-directed Dynamic ACPI Table Load:")); 329 status = 330 acpi_tb_install_and_load_table(table, ACPI_PTR_TO_PHYSADDR(table), 331 ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL, 332 FALSE, &table_index); 333 return_ACPI_STATUS(status); 334 } 335 336 ACPI_EXPORT_SYMBOL(acpi_load_table) 337 338 /******************************************************************************* 339 * 340 * FUNCTION: acpi_unload_parent_table 341 * 342 * PARAMETERS: object - Handle to any namespace object owned by 343 * the table to be unloaded 344 * 345 * RETURN: Status 346 * 347 * DESCRIPTION: Via any namespace object within an SSDT or OEMx table, unloads 348 * the table and deletes all namespace objects associated with 349 * that table. Unloading of the DSDT is not allowed. 350 * Note: Mainly intended to support hotplug removal of SSDTs. 351 * 352 ******************************************************************************/ 353 acpi_status acpi_unload_parent_table(acpi_handle object) 354 { 355 struct acpi_namespace_node *node = 356 ACPI_CAST_PTR(struct acpi_namespace_node, object); 357 acpi_status status = AE_NOT_EXIST; 358 acpi_owner_id owner_id; 359 u32 i; 360 361 ACPI_FUNCTION_TRACE(acpi_unload_parent_table); 362 363 /* Parameter validation */ 364 365 if (!object) { 366 return_ACPI_STATUS(AE_BAD_PARAMETER); 367 } 368 369 /* 370 * The node owner_id is currently the same as the parent table ID. 371 * However, this could change in the future. 372 */ 373 owner_id = node->owner_id; 374 if (!owner_id) { 375 376 /* owner_id==0 means DSDT is the owner. DSDT cannot be unloaded */ 377 378 return_ACPI_STATUS(AE_TYPE); 379 } 380 381 /* Must acquire the table lock during this operation */ 382 383 status = acpi_ut_acquire_mutex(ACPI_MTX_TABLES); 384 if (ACPI_FAILURE(status)) { 385 return_ACPI_STATUS(status); 386 } 387 388 /* Find the table in the global table list */ 389 390 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) { 391 if (owner_id != acpi_gbl_root_table_list.tables[i].owner_id) { 392 continue; 393 } 394 395 /* 396 * Allow unload of SSDT and OEMx tables only. Do not allow unload 397 * of the DSDT. No other types of tables should get here, since 398 * only these types can contain AML and thus are the only types 399 * that can create namespace objects. 400 */ 401 if (ACPI_COMPARE_NAME 402 (acpi_gbl_root_table_list.tables[i].signature.ascii, 403 ACPI_SIG_DSDT)) { 404 status = AE_TYPE; 405 break; 406 } 407 408 /* Ensure the table is actually loaded */ 409 410 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); 411 if (!acpi_tb_is_table_loaded(i)) { 412 status = AE_NOT_EXIST; 413 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); 414 break; 415 } 416 417 /* Invoke table handler if present */ 418 419 if (acpi_gbl_table_handler) { 420 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_UNLOAD, 421 acpi_gbl_root_table_list. 422 tables[i].pointer, 423 acpi_gbl_table_handler_context); 424 } 425 426 /* 427 * Delete all namespace objects owned by this table. Note that 428 * these objects can appear anywhere in the namespace by virtue 429 * of the AML "Scope" operator. Thus, we need to track ownership 430 * by an ID, not simply a position within the hierarchy. 431 */ 432 status = acpi_tb_delete_namespace_by_owner(i); 433 if (ACPI_FAILURE(status)) { 434 break; 435 } 436 437 status = acpi_tb_release_owner_id(i); 438 acpi_tb_set_table_loaded_flag(i, FALSE); 439 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); 440 break; 441 } 442 443 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); 444 return_ACPI_STATUS(status); 445 } 446 447 ACPI_EXPORT_SYMBOL(acpi_unload_parent_table) 448