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 ACPI_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_COMPARE_NAME 170 (&(acpi_gbl_root_table_list.tables[i].signature), 171 ACPI_SIG_SSDT) 172 && 173 !ACPI_COMPARE_NAME(& 174 (acpi_gbl_root_table_list.tables[i]. 175 signature), ACPI_SIG_PSDT)) 176 || 177 ACPI_FAILURE(acpi_tb_validate_table 178 (&acpi_gbl_root_table_list.tables[i]))) { 179 continue; 180 } 181 182 /* Ignore errors while loading tables, get as many as possible */ 183 184 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); 185 (void)acpi_ns_load_table(i, acpi_gbl_root_node); 186 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); 187 } 188 189 ACPI_INFO((AE_INFO, "All ACPI Tables successfully acquired")); 190 191 unlock_and_exit: 192 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); 193 return_ACPI_STATUS(status); 194 } 195 196 /******************************************************************************* 197 * 198 * FUNCTION: acpi_install_table 199 * 200 * PARAMETERS: address - Address of the ACPI table to be installed. 201 * physical - Whether the address is a physical table 202 * address or not 203 * 204 * RETURN: Status 205 * 206 * DESCRIPTION: Dynamically install an ACPI table. 207 * Note: This function should only be invoked after 208 * acpi_initialize_tables() and before acpi_load_tables(). 209 * 210 ******************************************************************************/ 211 212 acpi_status __init 213 acpi_install_table(acpi_physical_address address, u8 physical) 214 { 215 acpi_status status; 216 u8 flags; 217 u32 table_index; 218 219 ACPI_FUNCTION_TRACE(acpi_install_table); 220 221 if (physical) { 222 flags = ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL; 223 } else { 224 flags = ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL; 225 } 226 227 status = acpi_tb_install_standard_table(address, flags, 228 FALSE, FALSE, &table_index); 229 230 return_ACPI_STATUS(status); 231 } 232 233 ACPI_EXPORT_SYMBOL_INIT(acpi_install_table) 234 235 /******************************************************************************* 236 * 237 * FUNCTION: acpi_load_table 238 * 239 * PARAMETERS: table - Pointer to a buffer containing the ACPI 240 * table to be loaded. 241 * 242 * RETURN: Status 243 * 244 * DESCRIPTION: Dynamically load an ACPI table from the caller's buffer. Must 245 * be a valid ACPI table with a valid ACPI table header. 246 * Note1: Mainly intended to support hotplug addition of SSDTs. 247 * Note2: Does not copy the incoming table. User is responsible 248 * to ensure that the table is not deleted or unmapped. 249 * 250 ******************************************************************************/ 251 acpi_status acpi_load_table(struct acpi_table_header *table) 252 { 253 acpi_status status; 254 u32 table_index; 255 256 ACPI_FUNCTION_TRACE(acpi_load_table); 257 258 /* Parameter validation */ 259 260 if (!table) { 261 return_ACPI_STATUS(AE_BAD_PARAMETER); 262 } 263 264 /* Must acquire the interpreter lock during this operation */ 265 266 status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER); 267 if (ACPI_FAILURE(status)) { 268 return_ACPI_STATUS(status); 269 } 270 271 /* Install the table and load it into the namespace */ 272 273 ACPI_INFO((AE_INFO, "Host-directed Dynamic ACPI Table Load:")); 274 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); 275 276 status = acpi_tb_install_standard_table(ACPI_PTR_TO_PHYSADDR(table), 277 ACPI_TABLE_ORIGIN_EXTERNAL_VIRTUAL, 278 TRUE, FALSE, &table_index); 279 280 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); 281 if (ACPI_FAILURE(status)) { 282 goto unlock_and_exit; 283 } 284 285 /* 286 * Note: Now table is "INSTALLED", it must be validated before 287 * using. 288 */ 289 status = 290 acpi_tb_validate_table(&acpi_gbl_root_table_list. 291 tables[table_index]); 292 if (ACPI_FAILURE(status)) { 293 goto unlock_and_exit; 294 } 295 296 status = acpi_ns_load_table(table_index, acpi_gbl_root_node); 297 298 /* Invoke table handler if present */ 299 300 if (acpi_gbl_table_handler) { 301 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD, table, 302 acpi_gbl_table_handler_context); 303 } 304 305 unlock_and_exit: 306 (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER); 307 return_ACPI_STATUS(status); 308 } 309 310 ACPI_EXPORT_SYMBOL(acpi_load_table) 311 312 /******************************************************************************* 313 * 314 * FUNCTION: acpi_unload_parent_table 315 * 316 * PARAMETERS: object - Handle to any namespace object owned by 317 * the table to be unloaded 318 * 319 * RETURN: Status 320 * 321 * DESCRIPTION: Via any namespace object within an SSDT or OEMx table, unloads 322 * the table and deletes all namespace objects associated with 323 * that table. Unloading of the DSDT is not allowed. 324 * Note: Mainly intended to support hotplug removal of SSDTs. 325 * 326 ******************************************************************************/ 327 acpi_status acpi_unload_parent_table(acpi_handle object) 328 { 329 struct acpi_namespace_node *node = 330 ACPI_CAST_PTR(struct acpi_namespace_node, object); 331 acpi_status status = AE_NOT_EXIST; 332 acpi_owner_id owner_id; 333 u32 i; 334 335 ACPI_FUNCTION_TRACE(acpi_unload_parent_table); 336 337 /* Parameter validation */ 338 339 if (!object) { 340 return_ACPI_STATUS(AE_BAD_PARAMETER); 341 } 342 343 /* 344 * The node owner_id is currently the same as the parent table ID. 345 * However, this could change in the future. 346 */ 347 owner_id = node->owner_id; 348 if (!owner_id) { 349 350 /* owner_id==0 means DSDT is the owner. DSDT cannot be unloaded */ 351 352 return_ACPI_STATUS(AE_TYPE); 353 } 354 355 /* Must acquire the interpreter lock during this operation */ 356 357 status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER); 358 if (ACPI_FAILURE(status)) { 359 return_ACPI_STATUS(status); 360 } 361 362 /* Find the table in the global table list */ 363 364 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) { 365 if (owner_id != acpi_gbl_root_table_list.tables[i].owner_id) { 366 continue; 367 } 368 369 /* 370 * Allow unload of SSDT and OEMx tables only. Do not allow unload 371 * of the DSDT. No other types of tables should get here, since 372 * only these types can contain AML and thus are the only types 373 * that can create namespace objects. 374 */ 375 if (ACPI_COMPARE_NAME 376 (acpi_gbl_root_table_list.tables[i].signature.ascii, 377 ACPI_SIG_DSDT)) { 378 status = AE_TYPE; 379 break; 380 } 381 382 /* Ensure the table is actually loaded */ 383 384 if (!acpi_tb_is_table_loaded(i)) { 385 status = AE_NOT_EXIST; 386 break; 387 } 388 389 /* Invoke table handler if present */ 390 391 if (acpi_gbl_table_handler) { 392 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_UNLOAD, 393 acpi_gbl_root_table_list. 394 tables[i].pointer, 395 acpi_gbl_table_handler_context); 396 } 397 398 /* 399 * Delete all namespace objects owned by this table. Note that 400 * these objects can appear anywhere in the namespace by virtue 401 * of the AML "Scope" operator. Thus, we need to track ownership 402 * by an ID, not simply a position within the hierarchy. 403 */ 404 status = acpi_tb_delete_namespace_by_owner(i); 405 if (ACPI_FAILURE(status)) { 406 break; 407 } 408 409 status = acpi_tb_release_owner_id(i); 410 acpi_tb_set_table_loaded_flag(i, FALSE); 411 break; 412 } 413 414 (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER); 415 return_ACPI_STATUS(status); 416 } 417 418 ACPI_EXPORT_SYMBOL(acpi_unload_parent_table) 419