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 /* Local prototypes */ 55 static acpi_status acpi_tb_load_namespace(void); 56 57 /******************************************************************************* 58 * 59 * FUNCTION: acpi_load_tables 60 * 61 * PARAMETERS: None 62 * 63 * RETURN: Status 64 * 65 * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT 66 * 67 ******************************************************************************/ 68 69 acpi_status __init acpi_load_tables(void) 70 { 71 acpi_status status; 72 73 ACPI_FUNCTION_TRACE(acpi_load_tables); 74 75 /* Load the namespace from the tables */ 76 77 status = acpi_tb_load_namespace(); 78 if (ACPI_FAILURE(status)) { 79 ACPI_EXCEPTION((AE_INFO, status, 80 "While loading namespace from ACPI tables")); 81 } 82 83 return_ACPI_STATUS(status); 84 } 85 86 ACPI_EXPORT_SYMBOL_INIT(acpi_load_tables) 87 88 /******************************************************************************* 89 * 90 * FUNCTION: acpi_tb_load_namespace 91 * 92 * PARAMETERS: None 93 * 94 * RETURN: Status 95 * 96 * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in 97 * the RSDT/XSDT. 98 * 99 ******************************************************************************/ 100 static acpi_status acpi_tb_load_namespace(void) 101 { 102 acpi_status status; 103 u32 i; 104 struct acpi_table_header *new_dsdt; 105 106 ACPI_FUNCTION_TRACE(tb_load_namespace); 107 108 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); 109 110 /* 111 * Load the namespace. The DSDT is required, but any SSDT and 112 * PSDT tables are optional. Verify the DSDT. 113 */ 114 if (!acpi_gbl_root_table_list.current_table_count || 115 !ACPI_COMPARE_NAME(& 116 (acpi_gbl_root_table_list. 117 tables[ACPI_TABLE_INDEX_DSDT].signature), 118 ACPI_SIG_DSDT) 119 || 120 ACPI_FAILURE(acpi_tb_validate_table 121 (&acpi_gbl_root_table_list. 122 tables[ACPI_TABLE_INDEX_DSDT]))) { 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 = 134 acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT].pointer; 135 136 /* 137 * Optionally copy the entire DSDT to local memory (instead of simply 138 * mapping it.) There are some BIOSs that corrupt or replace the original 139 * DSDT, creating the need for this option. Default is FALSE, do not copy 140 * the DSDT. 141 */ 142 if (acpi_gbl_copy_dsdt_locally) { 143 new_dsdt = acpi_tb_copy_dsdt(ACPI_TABLE_INDEX_DSDT); 144 if (new_dsdt) { 145 acpi_gbl_DSDT = new_dsdt; 146 } 147 } 148 149 /* 150 * Save the original DSDT header for detection of table corruption 151 * and/or replacement of the DSDT from outside the OS. 152 */ 153 memcpy(&acpi_gbl_original_dsdt_header, acpi_gbl_DSDT, 154 sizeof(struct acpi_table_header)); 155 156 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); 157 158 /* Load and parse tables */ 159 160 status = acpi_ns_load_table(ACPI_TABLE_INDEX_DSDT, acpi_gbl_root_node); 161 if (ACPI_FAILURE(status)) { 162 return_ACPI_STATUS(status); 163 } 164 165 /* Load any SSDT or PSDT tables. Note: Loop leaves tables locked */ 166 167 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); 168 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) { 169 if (!acpi_gbl_root_table_list.tables[i].address || 170 (!ACPI_COMPARE_NAME 171 (&(acpi_gbl_root_table_list.tables[i].signature), 172 ACPI_SIG_SSDT) 173 && 174 !ACPI_COMPARE_NAME(& 175 (acpi_gbl_root_table_list.tables[i]. 176 signature), ACPI_SIG_PSDT) 177 && 178 !ACPI_COMPARE_NAME(& 179 (acpi_gbl_root_table_list.tables[i]. 180 signature), ACPI_SIG_OSDT)) 181 || 182 ACPI_FAILURE(acpi_tb_validate_table 183 (&acpi_gbl_root_table_list.tables[i]))) { 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 (void)acpi_ns_load_table(i, acpi_gbl_root_node); 191 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); 192 } 193 194 ACPI_INFO((AE_INFO, "All ACPI Tables successfully acquired")); 195 196 unlock_and_exit: 197 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); 198 return_ACPI_STATUS(status); 199 } 200 201 /******************************************************************************* 202 * 203 * FUNCTION: acpi_install_table 204 * 205 * PARAMETERS: address - Address of the ACPI table to be installed. 206 * physical - Whether the address is a physical table 207 * address or not 208 * 209 * RETURN: Status 210 * 211 * DESCRIPTION: Dynamically install an ACPI table. 212 * Note: This function should only be invoked after 213 * acpi_initialize_tables() and before acpi_load_tables(). 214 * 215 ******************************************************************************/ 216 217 acpi_status __init 218 acpi_install_table(acpi_physical_address address, u8 physical) 219 { 220 acpi_status status; 221 u8 flags; 222 u32 table_index; 223 224 ACPI_FUNCTION_TRACE(acpi_install_table); 225 226 if (physical) { 227 flags = ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL; 228 } else { 229 flags = ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL; 230 } 231 232 status = acpi_tb_install_standard_table(address, flags, 233 FALSE, FALSE, &table_index); 234 235 return_ACPI_STATUS(status); 236 } 237 238 ACPI_EXPORT_SYMBOL_INIT(acpi_install_table) 239 240 /******************************************************************************* 241 * 242 * FUNCTION: acpi_load_table 243 * 244 * PARAMETERS: table - Pointer to a buffer containing the ACPI 245 * table to be loaded. 246 * 247 * RETURN: Status 248 * 249 * DESCRIPTION: Dynamically load an ACPI table from the caller's buffer. Must 250 * be a valid ACPI table with a valid ACPI table header. 251 * Note1: Mainly intended to support hotplug addition of SSDTs. 252 * Note2: Does not copy the incoming table. User is responsible 253 * to ensure that the table is not deleted or unmapped. 254 * 255 ******************************************************************************/ 256 acpi_status acpi_load_table(struct acpi_table_header *table) 257 { 258 acpi_status status; 259 u32 table_index; 260 261 ACPI_FUNCTION_TRACE(acpi_load_table); 262 263 /* Parameter validation */ 264 265 if (!table) { 266 return_ACPI_STATUS(AE_BAD_PARAMETER); 267 } 268 269 /* Must acquire the interpreter lock during this operation */ 270 271 status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER); 272 if (ACPI_FAILURE(status)) { 273 return_ACPI_STATUS(status); 274 } 275 276 /* Install the table and load it into the namespace */ 277 278 ACPI_INFO((AE_INFO, "Host-directed Dynamic ACPI Table Load:")); 279 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); 280 281 status = acpi_tb_install_standard_table(ACPI_PTR_TO_PHYSADDR(table), 282 ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL, 283 TRUE, FALSE, &table_index); 284 285 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); 286 if (ACPI_FAILURE(status)) { 287 goto unlock_and_exit; 288 } 289 290 /* 291 * Note: Now table is "INSTALLED", it must be validated before 292 * using. 293 */ 294 status = 295 acpi_tb_validate_table(&acpi_gbl_root_table_list. 296 tables[table_index]); 297 if (ACPI_FAILURE(status)) { 298 goto unlock_and_exit; 299 } 300 301 status = acpi_ns_load_table(table_index, acpi_gbl_root_node); 302 303 /* Invoke table handler if present */ 304 305 if (acpi_gbl_table_handler) { 306 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD, table, 307 acpi_gbl_table_handler_context); 308 } 309 310 unlock_and_exit: 311 (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER); 312 return_ACPI_STATUS(status); 313 } 314 315 ACPI_EXPORT_SYMBOL(acpi_load_table) 316 317 /******************************************************************************* 318 * 319 * FUNCTION: acpi_unload_parent_table 320 * 321 * PARAMETERS: object - Handle to any namespace object owned by 322 * the table to be unloaded 323 * 324 * RETURN: Status 325 * 326 * DESCRIPTION: Via any namespace object within an SSDT or OEMx table, unloads 327 * the table and deletes all namespace objects associated with 328 * that table. Unloading of the DSDT is not allowed. 329 * Note: Mainly intended to support hotplug removal of SSDTs. 330 * 331 ******************************************************************************/ 332 acpi_status acpi_unload_parent_table(acpi_handle object) 333 { 334 struct acpi_namespace_node *node = 335 ACPI_CAST_PTR(struct acpi_namespace_node, object); 336 acpi_status status = AE_NOT_EXIST; 337 acpi_owner_id owner_id; 338 u32 i; 339 340 ACPI_FUNCTION_TRACE(acpi_unload_parent_table); 341 342 /* Parameter validation */ 343 344 if (!object) { 345 return_ACPI_STATUS(AE_BAD_PARAMETER); 346 } 347 348 /* 349 * The node owner_id is currently the same as the parent table ID. 350 * However, this could change in the future. 351 */ 352 owner_id = node->owner_id; 353 if (!owner_id) { 354 355 /* owner_id==0 means DSDT is the owner. DSDT cannot be unloaded */ 356 357 return_ACPI_STATUS(AE_TYPE); 358 } 359 360 /* Must acquire the interpreter lock during this operation */ 361 362 status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER); 363 if (ACPI_FAILURE(status)) { 364 return_ACPI_STATUS(status); 365 } 366 367 /* Find the table in the global table list */ 368 369 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) { 370 if (owner_id != acpi_gbl_root_table_list.tables[i].owner_id) { 371 continue; 372 } 373 374 /* 375 * Allow unload of SSDT and OEMx tables only. Do not allow unload 376 * of the DSDT. No other types of tables should get here, since 377 * only these types can contain AML and thus are the only types 378 * that can create namespace objects. 379 */ 380 if (ACPI_COMPARE_NAME 381 (acpi_gbl_root_table_list.tables[i].signature.ascii, 382 ACPI_SIG_DSDT)) { 383 status = AE_TYPE; 384 break; 385 } 386 387 /* Ensure the table is actually loaded */ 388 389 if (!acpi_tb_is_table_loaded(i)) { 390 status = AE_NOT_EXIST; 391 break; 392 } 393 394 /* Invoke table handler if present */ 395 396 if (acpi_gbl_table_handler) { 397 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_UNLOAD, 398 acpi_gbl_root_table_list. 399 tables[i].pointer, 400 acpi_gbl_table_handler_context); 401 } 402 403 /* 404 * Delete all namespace objects owned by this table. Note that 405 * these objects can appear anywhere in the namespace by virtue 406 * of the AML "Scope" operator. Thus, we need to track ownership 407 * by an ID, not simply a position within the hierarchy. 408 */ 409 status = acpi_tb_delete_namespace_by_owner(i); 410 if (ACPI_FAILURE(status)) { 411 break; 412 } 413 414 status = acpi_tb_release_owner_id(i); 415 acpi_tb_set_table_loaded_flag(i, FALSE); 416 break; 417 } 418 419 (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER); 420 return_ACPI_STATUS(status); 421 } 422 423 ACPI_EXPORT_SYMBOL(acpi_unload_parent_table) 424