Bob Moore | d59b8ec | 2012-07-16 10:15:36 +0800 | [diff] [blame] | 1 | /****************************************************************************** |
| 2 | * |
| 3 | * Module Name: tbxfload - Table load/unload external interfaces |
| 4 | * |
| 5 | *****************************************************************************/ |
| 6 | |
| 7 | /* |
Bob Moore | 25f044e | 2013-01-25 05:38:56 +0000 | [diff] [blame] | 8 | * Copyright (C) 2000 - 2013, Intel Corp. |
Bob Moore | d59b8ec | 2012-07-16 10:15:36 +0800 | [diff] [blame] | 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 | |
Bob Moore | d59b8ec | 2012-07-16 10:15:36 +0800 | [diff] [blame] | 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 | |
Lv Zheng | b75dd29 | 2013-06-08 00:58:48 +0000 | [diff] [blame^] | 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))); |
Bob Moore | d59b8ec | 2012-07-16 10:15:36 +0800 | [diff] [blame] | 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 | |
Bob Moore | 3e5621a | 2012-12-31 00:07:13 +0000 | [diff] [blame] | 201 | ACPI_INFO((AE_INFO, "All ACPI Tables successfully acquired")); |
Bob Moore | d59b8ec | 2012-07-16 10:15:36 +0800 | [diff] [blame] | 202 | |
| 203 | unlock_and_exit: |
| 204 | (void)acpi_ut_release_mutex(ACPI_MTX_TABLES); |
| 205 | return_ACPI_STATUS(status); |
| 206 | } |
| 207 | |
Bob Moore | f60d818 | 2012-07-16 10:21:34 +0800 | [diff] [blame] | 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. |
Bob Moore | 691fda5 | 2012-10-31 02:26:23 +0000 | [diff] [blame] | 220 | * Note2: Does not copy the incoming table. User is responsible |
Bob Moore | f60d818 | 2012-07-16 10:21:34 +0800 | [diff] [blame] | 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) |