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 - 2019, 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 /* 73 * Initialize the objects in the namespace that remain uninitialized. 74 * This runs the executable AML that may be part of the declaration of 75 * these name objects: 76 * operation_regions, buffer_fields, Buffers, and Packages. 77 * 78 */ 79 status = acpi_ns_initialize_objects(); 80 if (ACPI_SUCCESS(status)) { 81 acpi_gbl_namespace_initialized = TRUE; 82 } 83 84 return_ACPI_STATUS(status); 85 } 86 87 ACPI_EXPORT_SYMBOL_INIT(acpi_load_tables) 88 89 /******************************************************************************* 90 * 91 * FUNCTION: acpi_tb_load_namespace 92 * 93 * PARAMETERS: None 94 * 95 * RETURN: Status 96 * 97 * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in 98 * the RSDT/XSDT. 99 * 100 ******************************************************************************/ 101 acpi_status acpi_tb_load_namespace(void) 102 { 103 acpi_status status; 104 u32 i; 105 struct acpi_table_header *new_dsdt; 106 struct acpi_table_desc *table; 107 u32 tables_loaded = 0; 108 u32 tables_failed = 0; 109 110 ACPI_FUNCTION_TRACE(tb_load_namespace); 111 112 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); 113 114 /* 115 * Load the namespace. The DSDT is required, but any SSDT and 116 * PSDT tables are optional. Verify the DSDT. 117 */ 118 table = &acpi_gbl_root_table_list.tables[acpi_gbl_dsdt_index]; 119 120 if (!acpi_gbl_root_table_list.current_table_count || 121 !ACPI_COMPARE_NAMESEG(table->signature.ascii, ACPI_SIG_DSDT) || 122 ACPI_FAILURE(acpi_tb_validate_table(table))) { 123 status = AE_NO_ACPI_TABLES; 124 goto unlock_and_exit; 125 } 126 127 /* 128 * Save the DSDT pointer for simple access. This is the mapped memory 129 * address. We must take care here because the address of the .Tables 130 * array can change dynamically as tables are loaded at run-time. Note: 131 * .Pointer field is not validated until after call to acpi_tb_validate_table. 132 */ 133 acpi_gbl_DSDT = table->pointer; 134 135 /* 136 * Optionally copy the entire DSDT to local memory (instead of simply 137 * mapping it.) There are some BIOSs that corrupt or replace the original 138 * DSDT, creating the need for this option. Default is FALSE, do not copy 139 * the DSDT. 140 */ 141 if (acpi_gbl_copy_dsdt_locally) { 142 new_dsdt = acpi_tb_copy_dsdt(acpi_gbl_dsdt_index); 143 if (new_dsdt) { 144 acpi_gbl_DSDT = new_dsdt; 145 } 146 } 147 148 /* 149 * Save the original DSDT header for detection of table corruption 150 * and/or replacement of the DSDT from outside the OS. 151 */ 152 memcpy(&acpi_gbl_original_dsdt_header, acpi_gbl_DSDT, 153 sizeof(struct acpi_table_header)); 154 155 /* Load and parse tables */ 156 157 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); 158 status = acpi_ns_load_table(acpi_gbl_dsdt_index, acpi_gbl_root_node); 159 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); 160 if (ACPI_FAILURE(status)) { 161 ACPI_EXCEPTION((AE_INFO, status, "[DSDT] table load failed")); 162 tables_failed++; 163 } else { 164 tables_loaded++; 165 } 166 167 /* Load any SSDT or PSDT tables. Note: Loop leaves tables locked */ 168 169 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) { 170 table = &acpi_gbl_root_table_list.tables[i]; 171 172 if (!table->address || 173 (!ACPI_COMPARE_NAMESEG 174 (table->signature.ascii, ACPI_SIG_SSDT) 175 && !ACPI_COMPARE_NAMESEG(table->signature.ascii, 176 ACPI_SIG_PSDT) 177 && !ACPI_COMPARE_NAMESEG(table->signature.ascii, 178 ACPI_SIG_OSDT)) 179 || ACPI_FAILURE(acpi_tb_validate_table(table))) { 180 continue; 181 } 182 183 /* Ignore errors while loading tables, get as many as possible */ 184 185 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); 186 status = acpi_ns_load_table(i, acpi_gbl_root_node); 187 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); 188 if (ACPI_FAILURE(status)) { 189 ACPI_EXCEPTION((AE_INFO, status, 190 "(%4.4s:%8.8s) while loading table", 191 table->signature.ascii, 192 table->pointer->oem_table_id)); 193 194 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 } 204 205 if (!tables_failed) { 206 ACPI_INFO(("%u ACPI AML tables successfully acquired and loaded", tables_loaded)); 207 } else { 208 ACPI_ERROR((AE_INFO, 209 "%u table load failures, %u successful", 210 tables_failed, tables_loaded)); 211 212 /* Indicate at least one failure */ 213 214 status = AE_CTRL_TERMINATE; 215 } 216 217 #ifdef ACPI_APPLICATION 218 ACPI_DEBUG_PRINT_RAW((ACPI_DB_INIT, "\n")); 219 #endif 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 ACPI_INIT_FUNCTION 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 /* Install the table and load it into the namespace */ 295 296 ACPI_INFO(("Host-directed Dynamic ACPI Table Load:")); 297 status = acpi_tb_install_and_load_table(ACPI_PTR_TO_PHYSADDR(table), 298 ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL, 299 FALSE, &table_index); 300 return_ACPI_STATUS(status); 301 } 302 303 ACPI_EXPORT_SYMBOL(acpi_load_table) 304 305 /******************************************************************************* 306 * 307 * FUNCTION: acpi_unload_parent_table 308 * 309 * PARAMETERS: object - Handle to any namespace object owned by 310 * the table to be unloaded 311 * 312 * RETURN: Status 313 * 314 * DESCRIPTION: Via any namespace object within an SSDT or OEMx table, unloads 315 * the table and deletes all namespace objects associated with 316 * that table. Unloading of the DSDT is not allowed. 317 * Note: Mainly intended to support hotplug removal of SSDTs. 318 * 319 ******************************************************************************/ 320 acpi_status acpi_unload_parent_table(acpi_handle object) 321 { 322 struct acpi_namespace_node *node = 323 ACPI_CAST_PTR(struct acpi_namespace_node, object); 324 acpi_status status = AE_NOT_EXIST; 325 acpi_owner_id owner_id; 326 u32 i; 327 328 ACPI_FUNCTION_TRACE(acpi_unload_parent_table); 329 330 /* Parameter validation */ 331 332 if (!object) { 333 return_ACPI_STATUS(AE_BAD_PARAMETER); 334 } 335 336 /* 337 * The node owner_id is currently the same as the parent table ID. 338 * However, this could change in the future. 339 */ 340 owner_id = node->owner_id; 341 if (!owner_id) { 342 343 /* owner_id==0 means DSDT is the owner. DSDT cannot be unloaded */ 344 345 return_ACPI_STATUS(AE_TYPE); 346 } 347 348 /* Must acquire the table lock during this operation */ 349 350 status = acpi_ut_acquire_mutex(ACPI_MTX_TABLES); 351 if (ACPI_FAILURE(status)) { 352 return_ACPI_STATUS(status); 353 } 354 355 /* Find the table in the global table list */ 356 357 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) { 358 if (owner_id != acpi_gbl_root_table_list.tables[i].owner_id) { 359 continue; 360 } 361 362 /* 363 * Allow unload of SSDT and OEMx tables only. Do not allow unload 364 * of the DSDT. No other types of tables should get here, since 365 * only these types can contain AML and thus are the only types 366 * that can create namespace objects. 367 */ 368 if (ACPI_COMPARE_NAMESEG 369 (acpi_gbl_root_table_list.tables[i].signature.ascii, 370 ACPI_SIG_DSDT)) { 371 status = AE_TYPE; 372 break; 373 } 374 375 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); 376 status = acpi_tb_unload_table(i); 377 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); 378 break; 379 } 380 381 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); 382 return_ACPI_STATUS(status); 383 } 384 385 ACPI_EXPORT_SYMBOL(acpi_unload_parent_table) 386