1 /****************************************************************************** 2 * 3 * Module Name: tbxfload - Table load/unload external interfaces 4 * 5 *****************************************************************************/ 6 7 /* 8 * Copyright (C) 2000 - 2013, 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 #include <linux/export.h> 45 #include <acpi/acpi.h> 46 #include "accommon.h" 47 #include "acnamesp.h" 48 #include "actables.h" 49 50 #define _COMPONENT ACPI_TABLES 51 ACPI_MODULE_NAME("tbxfload") 52 53 /* Local prototypes */ 54 static acpi_status acpi_tb_load_namespace(void); 55 56 /******************************************************************************* 57 * 58 * FUNCTION: acpi_load_tables 59 * 60 * PARAMETERS: None 61 * 62 * RETURN: Status 63 * 64 * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT 65 * 66 ******************************************************************************/ 67 68 acpi_status acpi_load_tables(void) 69 { 70 acpi_status status; 71 72 ACPI_FUNCTION_TRACE(acpi_load_tables); 73 74 /* Load the namespace from the tables */ 75 76 status = acpi_tb_load_namespace(); 77 if (ACPI_FAILURE(status)) { 78 ACPI_EXCEPTION((AE_INFO, status, 79 "While loading namespace from ACPI tables")); 80 } 81 82 return_ACPI_STATUS(status); 83 } 84 85 ACPI_EXPORT_SYMBOL(acpi_load_tables) 86 87 /******************************************************************************* 88 * 89 * FUNCTION: acpi_tb_load_namespace 90 * 91 * PARAMETERS: None 92 * 93 * RETURN: Status 94 * 95 * DESCRIPTION: Load the namespace from the DSDT and all SSDTs/PSDTs found in 96 * the RSDT/XSDT. 97 * 98 ******************************************************************************/ 99 static acpi_status acpi_tb_load_namespace(void) 100 { 101 acpi_status status; 102 u32 i; 103 struct acpi_table_header *new_dsdt; 104 105 ACPI_FUNCTION_TRACE(tb_load_namespace); 106 107 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); 108 109 /* 110 * Load the namespace. The DSDT is required, but any SSDT and 111 * PSDT tables are optional. Verify the DSDT. 112 */ 113 if (!acpi_gbl_root_table_list.current_table_count || 114 !ACPI_COMPARE_NAME(& 115 (acpi_gbl_root_table_list. 116 tables[ACPI_TABLE_INDEX_DSDT].signature), 117 ACPI_SIG_DSDT) 118 || 119 ACPI_FAILURE(acpi_tb_verify_table 120 (&acpi_gbl_root_table_list. 121 tables[ACPI_TABLE_INDEX_DSDT]))) { 122 status = AE_NO_ACPI_TABLES; 123 goto unlock_and_exit; 124 } 125 126 /* 127 * Save the DSDT pointer for simple access. This is the mapped memory 128 * address. We must take care here because the address of the .Tables 129 * array can change dynamically as tables are loaded at run-time. Note: 130 * .Pointer field is not validated until after call to acpi_tb_verify_table. 131 */ 132 acpi_gbl_DSDT = 133 acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT].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_TABLE_INDEX_DSDT); 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 ACPI_MEMCPY(&acpi_gbl_original_dsdt_header, acpi_gbl_DSDT, 153 sizeof(struct acpi_table_header)); 154 155 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); 156 157 /* Load and parse tables */ 158 159 status = acpi_ns_load_table(ACPI_TABLE_INDEX_DSDT, acpi_gbl_root_node); 160 if (ACPI_FAILURE(status)) { 161 return_ACPI_STATUS(status); 162 } 163 164 /* Load any SSDT or PSDT tables. Note: Loop leaves tables locked */ 165 166 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); 167 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) { 168 if ((!ACPI_COMPARE_NAME 169 (&(acpi_gbl_root_table_list.tables[i].signature), 170 ACPI_SIG_SSDT) 171 && 172 !ACPI_COMPARE_NAME(& 173 (acpi_gbl_root_table_list.tables[i]. 174 signature), ACPI_SIG_PSDT)) 175 || 176 ACPI_FAILURE(acpi_tb_verify_table 177 (&acpi_gbl_root_table_list.tables[i]))) { 178 continue; 179 } 180 181 /* 182 * Optionally do not load any SSDTs from the RSDT/XSDT. This can 183 * be useful for debugging ACPI problems on some machines. 184 */ 185 if (acpi_gbl_disable_ssdt_table_load) { 186 ACPI_INFO((AE_INFO, "Ignoring %4.4s at %p", 187 acpi_gbl_root_table_list.tables[i].signature. 188 ascii, ACPI_CAST_PTR(void, 189 acpi_gbl_root_table_list. 190 tables[i].address))); 191 continue; 192 } 193 194 /* Ignore errors while loading tables, get as many as possible */ 195 196 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); 197 (void)acpi_ns_load_table(i, acpi_gbl_root_node); 198 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); 199 } 200 201 ACPI_INFO((AE_INFO, "All ACPI Tables successfully acquired")); 202 203 unlock_and_exit: 204 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); 205 return_ACPI_STATUS(status); 206 } 207 208 /******************************************************************************* 209 * 210 * FUNCTION: acpi_load_table 211 * 212 * PARAMETERS: table - Pointer to a buffer containing the ACPI 213 * table to be loaded. 214 * 215 * RETURN: Status 216 * 217 * DESCRIPTION: Dynamically load an ACPI table from the caller's buffer. Must 218 * be a valid ACPI table with a valid ACPI table header. 219 * Note1: Mainly intended to support hotplug addition of SSDTs. 220 * Note2: Does not copy the incoming table. User is responsible 221 * to ensure that the table is not deleted or unmapped. 222 * 223 ******************************************************************************/ 224 225 acpi_status acpi_load_table(struct acpi_table_header *table) 226 { 227 acpi_status status; 228 struct acpi_table_desc table_desc; 229 u32 table_index; 230 231 ACPI_FUNCTION_TRACE(acpi_load_table); 232 233 /* Parameter validation */ 234 235 if (!table) { 236 return_ACPI_STATUS(AE_BAD_PARAMETER); 237 } 238 239 /* Init local table descriptor */ 240 241 ACPI_MEMSET(&table_desc, 0, sizeof(struct acpi_table_desc)); 242 table_desc.address = ACPI_PTR_TO_PHYSADDR(table); 243 table_desc.pointer = table; 244 table_desc.length = table->length; 245 table_desc.flags = ACPI_TABLE_ORIGIN_UNKNOWN; 246 247 /* Must acquire the interpreter lock during this operation */ 248 249 status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER); 250 if (ACPI_FAILURE(status)) { 251 return_ACPI_STATUS(status); 252 } 253 254 /* Install the table and load it into the namespace */ 255 256 ACPI_INFO((AE_INFO, "Host-directed Dynamic ACPI Table Load:")); 257 status = acpi_tb_add_table(&table_desc, &table_index); 258 if (ACPI_FAILURE(status)) { 259 goto unlock_and_exit; 260 } 261 262 status = acpi_ns_load_table(table_index, acpi_gbl_root_node); 263 264 /* Invoke table handler if present */ 265 266 if (acpi_gbl_table_handler) { 267 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD, table, 268 acpi_gbl_table_handler_context); 269 } 270 271 unlock_and_exit: 272 (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER); 273 return_ACPI_STATUS(status); 274 } 275 276 ACPI_EXPORT_SYMBOL(acpi_load_table) 277 278 /******************************************************************************* 279 * 280 * FUNCTION: acpi_unload_parent_table 281 * 282 * PARAMETERS: object - Handle to any namespace object owned by 283 * the table to be unloaded 284 * 285 * RETURN: Status 286 * 287 * DESCRIPTION: Via any namespace object within an SSDT or OEMx table, unloads 288 * the table and deletes all namespace objects associated with 289 * that table. Unloading of the DSDT is not allowed. 290 * Note: Mainly intended to support hotplug removal of SSDTs. 291 * 292 ******************************************************************************/ 293 acpi_status acpi_unload_parent_table(acpi_handle object) 294 { 295 struct acpi_namespace_node *node = 296 ACPI_CAST_PTR(struct acpi_namespace_node, object); 297 acpi_status status = AE_NOT_EXIST; 298 acpi_owner_id owner_id; 299 u32 i; 300 301 ACPI_FUNCTION_TRACE(acpi_unload_parent_table); 302 303 /* Parameter validation */ 304 305 if (!object) { 306 return_ACPI_STATUS(AE_BAD_PARAMETER); 307 } 308 309 /* 310 * The node owner_id is currently the same as the parent table ID. 311 * However, this could change in the future. 312 */ 313 owner_id = node->owner_id; 314 if (!owner_id) { 315 316 /* owner_id==0 means DSDT is the owner. DSDT cannot be unloaded */ 317 318 return_ACPI_STATUS(AE_TYPE); 319 } 320 321 /* Must acquire the interpreter lock during this operation */ 322 323 status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER); 324 if (ACPI_FAILURE(status)) { 325 return_ACPI_STATUS(status); 326 } 327 328 /* Find the table in the global table list */ 329 330 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) { 331 if (owner_id != acpi_gbl_root_table_list.tables[i].owner_id) { 332 continue; 333 } 334 335 /* 336 * Allow unload of SSDT and OEMx tables only. Do not allow unload 337 * of the DSDT. No other types of tables should get here, since 338 * only these types can contain AML and thus are the only types 339 * that can create namespace objects. 340 */ 341 if (ACPI_COMPARE_NAME 342 (acpi_gbl_root_table_list.tables[i].signature.ascii, 343 ACPI_SIG_DSDT)) { 344 status = AE_TYPE; 345 break; 346 } 347 348 /* Ensure the table is actually loaded */ 349 350 if (!acpi_tb_is_table_loaded(i)) { 351 status = AE_NOT_EXIST; 352 break; 353 } 354 355 /* Invoke table handler if present */ 356 357 if (acpi_gbl_table_handler) { 358 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_UNLOAD, 359 acpi_gbl_root_table_list. 360 tables[i].pointer, 361 acpi_gbl_table_handler_context); 362 } 363 364 /* 365 * Delete all namespace objects owned by this table. Note that 366 * these objects can appear anywhere in the namespace by virtue 367 * of the AML "Scope" operator. Thus, we need to track ownership 368 * by an ID, not simply a position within the hierarchy. 369 */ 370 status = acpi_tb_delete_namespace_by_owner(i); 371 if (ACPI_FAILURE(status)) { 372 break; 373 } 374 375 status = acpi_tb_release_owner_id(i); 376 acpi_tb_set_table_loaded_flag(i, FALSE); 377 break; 378 } 379 380 (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER); 381 return_ACPI_STATUS(status); 382 } 383 384 ACPI_EXPORT_SYMBOL(acpi_unload_parent_table) 385