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 static int no_auto_ssdt; 57 58 /******************************************************************************* 59 * 60 * FUNCTION: acpi_load_tables 61 * 62 * PARAMETERS: None 63 * 64 * RETURN: Status 65 * 66 * DESCRIPTION: Load the ACPI tables from the RSDT/XSDT 67 * 68 ******************************************************************************/ 69 70 acpi_status acpi_load_tables(void) 71 { 72 acpi_status status; 73 74 ACPI_FUNCTION_TRACE(acpi_load_tables); 75 76 /* Load the namespace from the tables */ 77 78 status = acpi_tb_load_namespace(); 79 if (ACPI_FAILURE(status)) { 80 ACPI_EXCEPTION((AE_INFO, status, 81 "While loading namespace from ACPI tables")); 82 } 83 84 return_ACPI_STATUS(status); 85 } 86 87 ACPI_EXPORT_SYMBOL(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 static acpi_status acpi_tb_load_namespace(void) 102 { 103 acpi_status status; 104 u32 i; 105 struct acpi_table_header *new_dsdt; 106 107 ACPI_FUNCTION_TRACE(tb_load_namespace); 108 109 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); 110 111 /* 112 * Load the namespace. The DSDT is required, but any SSDT and 113 * PSDT tables are optional. Verify the DSDT. 114 */ 115 if (!acpi_gbl_root_table_list.current_table_count || 116 !ACPI_COMPARE_NAME(& 117 (acpi_gbl_root_table_list. 118 tables[ACPI_TABLE_INDEX_DSDT].signature), 119 ACPI_SIG_DSDT) 120 || 121 ACPI_FAILURE(acpi_tb_verify_table 122 (&acpi_gbl_root_table_list. 123 tables[ACPI_TABLE_INDEX_DSDT]))) { 124 status = AE_NO_ACPI_TABLES; 125 goto unlock_and_exit; 126 } 127 128 /* 129 * Save the DSDT pointer for simple access. This is the mapped memory 130 * address. We must take care here because the address of the .Tables 131 * array can change dynamically as tables are loaded at run-time. Note: 132 * .Pointer field is not validated until after call to acpi_tb_verify_table. 133 */ 134 acpi_gbl_DSDT = 135 acpi_gbl_root_table_list.tables[ACPI_TABLE_INDEX_DSDT].pointer; 136 137 /* 138 * Optionally copy the entire DSDT to local memory (instead of simply 139 * mapping it.) There are some BIOSs that corrupt or replace the original 140 * DSDT, creating the need for this option. Default is FALSE, do not copy 141 * the DSDT. 142 */ 143 if (acpi_gbl_copy_dsdt_locally) { 144 new_dsdt = acpi_tb_copy_dsdt(ACPI_TABLE_INDEX_DSDT); 145 if (new_dsdt) { 146 acpi_gbl_DSDT = new_dsdt; 147 } 148 } 149 150 /* 151 * Save the original DSDT header for detection of table corruption 152 * and/or replacement of the DSDT from outside the OS. 153 */ 154 ACPI_MEMCPY(&acpi_gbl_original_dsdt_header, acpi_gbl_DSDT, 155 sizeof(struct acpi_table_header)); 156 157 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); 158 159 /* Load and parse tables */ 160 161 status = acpi_ns_load_table(ACPI_TABLE_INDEX_DSDT, acpi_gbl_root_node); 162 if (ACPI_FAILURE(status)) { 163 return_ACPI_STATUS(status); 164 } 165 166 /* Load any SSDT or PSDT tables. Note: Loop leaves tables locked */ 167 168 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); 169 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; ++i) { 170 if ((!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_FAILURE(acpi_tb_verify_table 179 (&acpi_gbl_root_table_list.tables[i]))) { 180 continue; 181 } 182 183 if (no_auto_ssdt) { 184 printk(KERN_WARNING "ACPI: SSDT ignored due to \"acpi_no_auto_ssdt\"\n"); 185 continue; 186 } 187 188 /* Ignore errors while loading tables, get as many as possible */ 189 190 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); 191 (void)acpi_ns_load_table(i, acpi_gbl_root_node); 192 (void)acpi_ut_acquire_mutex(ACPI_MTX_TABLES); 193 } 194 195 ACPI_INFO((AE_INFO, "All ACPI Tables successfully acquired")); 196 197 unlock_and_exit: 198 (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); 199 return_ACPI_STATUS(status); 200 } 201 202 /******************************************************************************* 203 * 204 * FUNCTION: acpi_load_table 205 * 206 * PARAMETERS: table - Pointer to a buffer containing the ACPI 207 * table to be loaded. 208 * 209 * RETURN: Status 210 * 211 * DESCRIPTION: Dynamically load an ACPI table from the caller's buffer. Must 212 * be a valid ACPI table with a valid ACPI table header. 213 * Note1: Mainly intended to support hotplug addition of SSDTs. 214 * Note2: Does not copy the incoming table. User is responsible 215 * to ensure that the table is not deleted or unmapped. 216 * 217 ******************************************************************************/ 218 219 acpi_status acpi_load_table(struct acpi_table_header *table) 220 { 221 acpi_status status; 222 struct acpi_table_desc table_desc; 223 u32 table_index; 224 225 ACPI_FUNCTION_TRACE(acpi_load_table); 226 227 /* Parameter validation */ 228 229 if (!table) { 230 return_ACPI_STATUS(AE_BAD_PARAMETER); 231 } 232 233 /* Init local table descriptor */ 234 235 ACPI_MEMSET(&table_desc, 0, sizeof(struct acpi_table_desc)); 236 table_desc.address = ACPI_PTR_TO_PHYSADDR(table); 237 table_desc.pointer = table; 238 table_desc.length = table->length; 239 table_desc.flags = ACPI_TABLE_ORIGIN_UNKNOWN; 240 241 /* Must acquire the interpreter lock during this operation */ 242 243 status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER); 244 if (ACPI_FAILURE(status)) { 245 return_ACPI_STATUS(status); 246 } 247 248 /* Install the table and load it into the namespace */ 249 250 ACPI_INFO((AE_INFO, "Host-directed Dynamic ACPI Table Load:")); 251 status = acpi_tb_add_table(&table_desc, &table_index); 252 if (ACPI_FAILURE(status)) { 253 goto unlock_and_exit; 254 } 255 256 status = acpi_ns_load_table(table_index, acpi_gbl_root_node); 257 258 /* Invoke table handler if present */ 259 260 if (acpi_gbl_table_handler) { 261 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_LOAD, table, 262 acpi_gbl_table_handler_context); 263 } 264 265 unlock_and_exit: 266 (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER); 267 return_ACPI_STATUS(status); 268 } 269 270 ACPI_EXPORT_SYMBOL(acpi_load_table) 271 272 /******************************************************************************* 273 * 274 * FUNCTION: acpi_unload_parent_table 275 * 276 * PARAMETERS: object - Handle to any namespace object owned by 277 * the table to be unloaded 278 * 279 * RETURN: Status 280 * 281 * DESCRIPTION: Via any namespace object within an SSDT or OEMx table, unloads 282 * the table and deletes all namespace objects associated with 283 * that table. Unloading of the DSDT is not allowed. 284 * Note: Mainly intended to support hotplug removal of SSDTs. 285 * 286 ******************************************************************************/ 287 acpi_status acpi_unload_parent_table(acpi_handle object) 288 { 289 struct acpi_namespace_node *node = 290 ACPI_CAST_PTR(struct acpi_namespace_node, object); 291 acpi_status status = AE_NOT_EXIST; 292 acpi_owner_id owner_id; 293 u32 i; 294 295 ACPI_FUNCTION_TRACE(acpi_unload_parent_table); 296 297 /* Parameter validation */ 298 299 if (!object) { 300 return_ACPI_STATUS(AE_BAD_PARAMETER); 301 } 302 303 /* 304 * The node owner_id is currently the same as the parent table ID. 305 * However, this could change in the future. 306 */ 307 owner_id = node->owner_id; 308 if (!owner_id) { 309 310 /* owner_id==0 means DSDT is the owner. DSDT cannot be unloaded */ 311 312 return_ACPI_STATUS(AE_TYPE); 313 } 314 315 /* Must acquire the interpreter lock during this operation */ 316 317 status = acpi_ut_acquire_mutex(ACPI_MTX_INTERPRETER); 318 if (ACPI_FAILURE(status)) { 319 return_ACPI_STATUS(status); 320 } 321 322 /* Find the table in the global table list */ 323 324 for (i = 0; i < acpi_gbl_root_table_list.current_table_count; i++) { 325 if (owner_id != acpi_gbl_root_table_list.tables[i].owner_id) { 326 continue; 327 } 328 329 /* 330 * Allow unload of SSDT and OEMx tables only. Do not allow unload 331 * of the DSDT. No other types of tables should get here, since 332 * only these types can contain AML and thus are the only types 333 * that can create namespace objects. 334 */ 335 if (ACPI_COMPARE_NAME 336 (acpi_gbl_root_table_list.tables[i].signature.ascii, 337 ACPI_SIG_DSDT)) { 338 status = AE_TYPE; 339 break; 340 } 341 342 /* Ensure the table is actually loaded */ 343 344 if (!acpi_tb_is_table_loaded(i)) { 345 status = AE_NOT_EXIST; 346 break; 347 } 348 349 /* Invoke table handler if present */ 350 351 if (acpi_gbl_table_handler) { 352 (void)acpi_gbl_table_handler(ACPI_TABLE_EVENT_UNLOAD, 353 acpi_gbl_root_table_list. 354 tables[i].pointer, 355 acpi_gbl_table_handler_context); 356 } 357 358 /* 359 * Delete all namespace objects owned by this table. Note that 360 * these objects can appear anywhere in the namespace by virtue 361 * of the AML "Scope" operator. Thus, we need to track ownership 362 * by an ID, not simply a position within the hierarchy. 363 */ 364 status = acpi_tb_delete_namespace_by_owner(i); 365 if (ACPI_FAILURE(status)) { 366 break; 367 } 368 369 status = acpi_tb_release_owner_id(i); 370 acpi_tb_set_table_loaded_flag(i, FALSE); 371 break; 372 } 373 374 (void)acpi_ut_release_mutex(ACPI_MTX_INTERPRETER); 375 return_ACPI_STATUS(status); 376 } 377 378 ACPI_EXPORT_SYMBOL(acpi_unload_parent_table) 379 380 static int __init acpi_no_auto_ssdt_setup(char *s) { 381 382 printk(KERN_NOTICE "ACPI: SSDT auto-load disabled\n"); 383 384 no_auto_ssdt = 1; 385 386 return 1; 387 } 388 389 __setup("acpi_no_auto_ssdt", acpi_no_auto_ssdt_setup); 390