1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 2 /****************************************************************************** 3 * 4 * Module Name: tbxfload - Table load/unload external interfaces 5 * 6 * Copyright (C) 2000 - 2018, Intel Corp. 7 * 8 *****************************************************************************/ 9 10 #define EXPORT_ACPI_INTERFACES 11 12 #include <acpi/acpi.h> 13 #include "accommon.h" 14 #include "acnamesp.h" 15 #include "actables.h" 16 #include "acevents.h" 17 18 #define _COMPONENT ACPI_TABLES 19 ACPI_MODULE_NAME("tbxfload") 20 21 /******************************************************************************* 22 * 23 * FUNCTION: acpi_load_tables 24 * 25 * PARAMETERS: None 26 * 27 * RETURN: Status 28 * 29 * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT 30 * 31 ******************************************************************************/ 32 acpi_status ACPI_INIT_FUNCTION acpi_load_tables(void) 33 { 34 acpi_status status; 35 36 ACPI_FUNCTION_TRACE(acpi_load_tables); 37 38 /* 39 * Install the default operation region handlers. These are the 40 * handlers that are defined by the ACPI specification to be 41 * "always accessible" -- namely, system_memory, system_IO, and 42 * PCI_Config. This also means that no _REG methods need to be 43 * run for these address spaces. We need to have these handlers 44 * installed before any AML code can be executed, especially any 45 * module-level code (11/2015). 46 * Note that we allow OSPMs to install their own region handlers 47 * between acpi_initialize_subsystem() and acpi_load_tables() to use 48 * their customized default region handlers. 49 */ 50 status = acpi_ev_install_region_handlers(); 51 if (ACPI_FAILURE(status)) { 52 ACPI_EXCEPTION((AE_INFO, status, 53 "During Region initialization")); 54 return_ACPI_STATUS(status); 55 } 56 57 /* Load the namespace from the tables */ 58 59 status = acpi_tb_load_namespace(); 60 61 /* Don't let single failures abort the load */ 62 63 if (status == AE_CTRL_TERMINATE) { 64 status = AE_OK; 65 } 66 67 if (ACPI_FAILURE(status)) { 68 ACPI_EXCEPTION((AE_INFO, status, 69 "While loading namespace from ACPI tables")); 70 } 71 72 if (acpi_gbl_execute_tables_as_methods) { 73 /* 74 * If the module-level code support is enabled, initialize the objects 75 * in the namespace that remain uninitialized. This runs the executable 76 * AML that may be part of the declaration of these name objects: 77 * operation_regions, buffer_fields, Buffers, and Packages. 78 * 79 * Note: The module-level code is optional at this time, but will 80 * become the default in the future. 81 */ 82 status = acpi_ns_initialize_objects(); 83 if (ACPI_FAILURE(status)) { 84 return_ACPI_STATUS(status); 85 } 86 } 87 88 acpi_gbl_namespace_initialized = TRUE; 89 return_ACPI_STATUS(status); 90 } 91 92 ACPI_EXPORT_SYMBOL_INIT(acpi_load_tables) 93 94 /******************************************************************************* 95 * 96 * FUNCTION: acpi_tb_load_namespace 97 * 98 * PARAMETERS: None 99 * 100 * RETURN: Status 101 * 102 * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in 103 * the RSDT/XSDT. 104 * 105 ******************************************************************************/ 106 acpi_status acpi_tb_load_namespace(void) 107 { 108 acpi_status status; 109 u32 i; 110 struct acpi_table_header *new_dsdt; 111 struct acpi_table_desc *table; 112 u32 tables_loaded = 0; 113 u32 tables_failed = 0; 114 115 ACPI_FUNCTION_TRACE(tb_load_namespace); 116 117 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); 118 119 /* 120 * Load the namespace. The DSDT is required, but any SSDT and 121 * PSDT tables are optional. Verify the DSDT. 122 */ 123 table = &acpi_gbl_root_table_list.tables[acpi_gbl_dsdt_index]; 124 125 if (!acpi_gbl_root_table_list.current_table_count || 126 !ACPI_COMPARE_NAME(table->signature.ascii, ACPI_SIG_DSDT) || 127 ACPI_FAILURE(acpi_tb_validate_table(table))) { 128 status = AE_NO_ACPI_TABLES; 129 goto unlock_and_exit; 130 } 131 132 /* 133 * Save the DSDT pointer for simple access. This is the mapped memory 134 * address. We must take care here because the address of the .Tables 135 * array can change dynamically as tables are loaded at run-time. Note: 136 * .Pointer field is not validated until after call to acpi_tb_validate_table. 137 */ 138 acpi_gbl_DSDT = table->pointer; 139 140 /* 141 * Optionally copy the entire DSDT to local memory (instead of simply 142 * mapping it.) There are some BIOSs that corrupt or replace the original 143 * DSDT, creating the need for this option. Default is FALSE, do not copy 144 * the DSDT. 145 */ 146 if (acpi_gbl_copy_dsdt_locally) { 147 new_dsdt = acpi_tb_copy_dsdt(acpi_gbl_dsdt_index); 148 if (new_dsdt) { 149 acpi_gbl_DSDT = new_dsdt; 150 } 151 } 152 153 /* 154 * Save the original DSDT header for detection of table corruption 155 * and/or replacement of the DSDT from outside the OS. 156 */ 157 memcpy(&acpi_gbl_original_dsdt_header, acpi_gbl_DSDT, 158 sizeof(struct acpi_table_header)); 159 160 /* Load and parse tables */ 161 162 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); 163 status = acpi_ns_load_table(acpi_gbl_dsdt_index, acpi_gbl_root_node); 164 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); 165 if (ACPI_FAILURE(status)) { 166 ACPI_EXCEPTION((AE_INFO, status, "[DSDT] table load failed")); 167 tables_failed++; 168 } else { 169 tables_loaded++; 170 } 171 172 /* Load any SSDT or PSDT tables. Note: Loop leaves tables locked */ 173 174 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) { 175 table = &acpi_gbl_root_table_list.tables[i]; 176 177 if (!table->address || 178 (!ACPI_COMPARE_NAME(table->signature.ascii, ACPI_SIG_SSDT) 179 && !ACPI_COMPARE_NAME(table->signature.ascii, 180 ACPI_SIG_PSDT) 181 && !ACPI_COMPARE_NAME(table->signature.ascii, 182 ACPI_SIG_OSDT)) 183 || ACPI_FAILURE(acpi_tb_validate_table(table))) { 184 continue; 185 } 186 187 /* Ignore errors while loading tables, get as many as possible */ 188 189 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); 190 status = acpi_ns_load_table(i, acpi_gbl_root_node); 191 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); 192 if (ACPI_FAILURE(status)) { 193 ACPI_EXCEPTION((AE_INFO, status, 194 "(%4.4s:%8.8s) while loading table", 195 table->signature.ascii, 196 table->pointer->oem_table_id)); 197 198 tables_failed++; 199 200 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, 201 "Table [%4.4s:%8.8s] (id FF) - Table namespace load failed\n\n", 202 table->signature.ascii, 203 table->pointer->oem_table_id)); 204 } else { 205 tables_loaded++; 206 } 207 } 208 209 if (!tables_failed) { 210 ACPI_INFO(("%u ACPI AML tables successfully acquired and loaded", 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 #ifdef ACPI_APPLICATION 222 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "\n")); 223 #endif 224 225 unlock_and_exit: 226 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); 227 return_ACPI_STATUS(status); 228 } 229 230 /******************************************************************************* 231 * 232 * FUNCTION: acpi_install_table 233 * 234 * PARAMETERS: address - Address of the ACPI table to be installed. 235 * physical - Whether the address is a physical table 236 * address or not 237 * 238 * RETURN: Status 239 * 240 * DESCRIPTION: Dynamically install an ACPI table. 241 * Note: This function should only be invoked after 242 * acpi_initialize_tables() and before acpi_load_tables(). 243 * 244 ******************************************************************************/ 245 246 acpi_status ACPI_INIT_FUNCTION 247 acpi_install_table(acpi_physical_address address, u8 physical) 248 { 249 acpi_status status; 250 u8 flags; 251 u32 table_index; 252 253 ACPI_FUNCTION_TRACE(acpi_install_table); 254 255 if (physical) { 256 flags = ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL; 257 } else { 258 flags = ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL; 259 } 260 261 status = acpi_tb_install_standard_table(address, flags, 262 FALSE, FALSE, &table_index); 263 264 return_ACPI_STATUS(status); 265 } 266 267 ACPI_EXPORT_SYMBOL_INIT(acpi_install_table) 268 269 /******************************************************************************* 270 * 271 * FUNCTION: acpi_load_table 272 * 273 * PARAMETERS: table - Pointer to a buffer containing the ACPI 274 * table to be loaded. 275 * 276 * RETURN: Status 277 * 278 * DESCRIPTION: Dynamically load an ACPI table from the caller's buffer. Must 279 * be a valid ACPI table with a valid ACPI table header. 280 * Note1: Mainly intended to support hotplug addition of SSDTs. 281 * Note2: Does not copy the incoming table. User is responsible 282 * to ensure that the table is not deleted or unmapped. 283 * 284 ******************************************************************************/ 285 acpi_status acpi_load_table(struct acpi_table_header *table) 286 { 287 acpi_status status; 288 u32 table_index; 289 290 ACPI_FUNCTION_TRACE(acpi_load_table); 291 292 /* Parameter validation */ 293 294 if (!table) { 295 return_ACPI_STATUS(AE_BAD_PARAMETER); 296 } 297 298 /* Install the table and load it into the namespace */ 299 300 ACPI_INFO(("Host-directed Dynamic ACPI Table Load:")); 301 status = acpi_tb_install_and_load_table(ACPI_PTR_TO_PHYSADDR(table), 302 ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL, 303 FALSE, &table_index); 304 return_ACPI_STATUS(status); 305 } 306 307 ACPI_EXPORT_SYMBOL(acpi_load_table) 308 309 /******************************************************************************* 310 * 311 * FUNCTION: acpi_unload_parent_table 312 * 313 * PARAMETERS: object - Handle to any namespace object owned by 314 * the table to be unloaded 315 * 316 * RETURN: Status 317 * 318 * DESCRIPTION: Via any namespace object within an SSDT or OEMx table, unloads 319 * the table and deletes all namespace objects associated with 320 * that table. Unloading of the DSDT is not allowed. 321 * Note: Mainly intended to support hotplug removal of SSDTs. 322 * 323 ******************************************************************************/ 324 acpi_status acpi_unload_parent_table(acpi_handle object) 325 { 326 struct acpi_namespace_node *node = 327 ACPI_CAST_PTR(struct acpi_namespace_node, object); 328 acpi_status status = AE_NOT_EXIST; 329 acpi_owner_id owner_id; 330 u32 i; 331 332 ACPI_FUNCTION_TRACE(acpi_unload_parent_table); 333 334 /* Parameter validation */ 335 336 if (!object) { 337 return_ACPI_STATUS(AE_BAD_PARAMETER); 338 } 339 340 /* 341 * The node owner_id is currently the same as the parent table ID. 342 * However, this could change in the future. 343 */ 344 owner_id = node->owner_id; 345 if (!owner_id) { 346 347 /* owner_id==0 means DSDT is the owner. DSDT cannot be unloaded */ 348 349 return_ACPI_STATUS(AE_TYPE); 350 } 351 352 /* Must acquire the table lock during this operation */ 353 354 status = acpi_ut_acquire_mutex(ACPI_MTX_TABLES); 355 if (ACPI_FAILURE(status)) { 356 return_ACPI_STATUS(status); 357 } 358 359 /* Find the table in the global table list */ 360 361 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) { 362 if (owner_id != acpi_gbl_root_table_list.tables[i].owner_id) { 363 continue; 364 } 365 366 /* 367 * Allow unload of SSDT and OEMx tables only. Do not allow unload 368 * of the DSDT. No other types of tables should get here, since 369 * only these types can contain AML and thus are the only types 370 * that can create namespace objects. 371 */ 372 if (ACPI_COMPARE_NAME 373 (acpi_gbl_root_table_list.tables[i].signature.ascii, 374 ACPI_SIG_DSDT)) { 375 status = AE_TYPE; 376 break; 377 } 378 379 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); 380 status = acpi_tb_unload_table(i); 381 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); 382 break; 383 } 384 385 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); 386 return_ACPI_STATUS(status); 387 } 388 389 ACPI_EXPORT_SYMBOL(acpi_unload_parent_table) 390