1/******************************************************************************* 2 * 3 * Module Name: utdelete - object deletion and reference count utilities 4 * 5 ******************************************************************************/ 6 7/* 8 * Copyright (C) 2000 - 2010, 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 <acpi/acpi.h> 45#include "accommon.h" 46#include "acinterp.h" 47#include "acnamesp.h" 48#include "acevents.h" 49 50#define _COMPONENT ACPI_UTILITIES 51ACPI_MODULE_NAME("utdelete") 52 53/* Local prototypes */ 54static void acpi_ut_delete_internal_obj(union acpi_operand_object *object); 55 56static void 57acpi_ut_update_ref_count(union acpi_operand_object *object, u32 action); 58 59/******************************************************************************* 60 * 61 * FUNCTION: acpi_ut_delete_internal_obj 62 * 63 * PARAMETERS: Object - Object to be deleted 64 * 65 * RETURN: None 66 * 67 * DESCRIPTION: Low level object deletion, after reference counts have been 68 * updated (All reference counts, including sub-objects!) 69 * 70 ******************************************************************************/ 71 72static void acpi_ut_delete_internal_obj(union acpi_operand_object *object) 73{ 74 void *obj_pointer = NULL; 75 union acpi_operand_object *handler_desc; 76 union acpi_operand_object *second_desc; 77 union acpi_operand_object *next_desc; 78 union acpi_operand_object **last_obj_ptr; 79 80 ACPI_FUNCTION_TRACE_PTR(ut_delete_internal_obj, object); 81 82 if (!object) { 83 return_VOID; 84 } 85 86 /* 87 * Must delete or free any pointers within the object that are not 88 * actual ACPI objects (for example, a raw buffer pointer). 89 */ 90 switch (object->common.type) { 91 case ACPI_TYPE_STRING: 92 93 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, 94 "**** String %p, ptr %p\n", object, 95 object->string.pointer)); 96 97 /* Free the actual string buffer */ 98 99 if (!(object->common.flags & AOPOBJ_STATIC_POINTER)) { 100 101 /* But only if it is NOT a pointer into an ACPI table */ 102 103 obj_pointer = object->string.pointer; 104 } 105 break; 106 107 case ACPI_TYPE_BUFFER: 108 109 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, 110 "**** Buffer %p, ptr %p\n", object, 111 object->buffer.pointer)); 112 113 /* Free the actual buffer */ 114 115 if (!(object->common.flags & AOPOBJ_STATIC_POINTER)) { 116 117 /* But only if it is NOT a pointer into an ACPI table */ 118 119 obj_pointer = object->buffer.pointer; 120 } 121 break; 122 123 case ACPI_TYPE_PACKAGE: 124 125 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, 126 " **** Package of count %X\n", 127 object->package.count)); 128 129 /* 130 * Elements of the package are not handled here, they are deleted 131 * separately 132 */ 133 134 /* Free the (variable length) element pointer array */ 135 136 obj_pointer = object->package.elements; 137 break; 138 139 /* 140 * These objects have a possible list of notify handlers. 141 * Device object also may have a GPE block. 142 */ 143 case ACPI_TYPE_DEVICE: 144 145 if (object->device.gpe_block) { 146 (void)acpi_ev_delete_gpe_block(object->device. 147 gpe_block); 148 } 149 150 /*lint -fallthrough */ 151 152 case ACPI_TYPE_PROCESSOR: 153 case ACPI_TYPE_THERMAL: 154 155 /* Walk the notify handler list for this object */ 156 157 handler_desc = object->common_notify.handler; 158 while (handler_desc) { 159 next_desc = handler_desc->address_space.next; 160 acpi_ut_remove_reference(handler_desc); 161 handler_desc = next_desc; 162 } 163 break; 164 165 case ACPI_TYPE_MUTEX: 166 167 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, 168 "***** Mutex %p, OS Mutex %p\n", 169 object, object->mutex.os_mutex)); 170 171 if (object == acpi_gbl_global_lock_mutex) { 172 173 /* Global Lock has extra semaphore */ 174 175 (void) 176 acpi_os_delete_semaphore 177 (acpi_gbl_global_lock_semaphore); 178 acpi_gbl_global_lock_semaphore = NULL; 179 180 acpi_os_delete_mutex(object->mutex.os_mutex); 181 acpi_gbl_global_lock_mutex = NULL; 182 } else { 183 acpi_ex_unlink_mutex(object); 184 acpi_os_delete_mutex(object->mutex.os_mutex); 185 } 186 break; 187 188 case ACPI_TYPE_EVENT: 189 190 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, 191 "***** Event %p, OS Semaphore %p\n", 192 object, object->event.os_semaphore)); 193 194 (void)acpi_os_delete_semaphore(object->event.os_semaphore); 195 object->event.os_semaphore = NULL; 196 break; 197 198 case ACPI_TYPE_METHOD: 199 200 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, 201 "***** Method %p\n", object)); 202 203 /* Delete the method mutex if it exists */ 204 205 if (object->method.mutex) { 206 acpi_os_delete_mutex(object->method.mutex->mutex. 207 os_mutex); 208 acpi_ut_delete_object_desc(object->method.mutex); 209 object->method.mutex = NULL; 210 } 211 break; 212 213 case ACPI_TYPE_REGION: 214 215 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, 216 "***** Region %p\n", object)); 217 218 /* Invalidate the region address/length via the host OS */ 219 220 acpi_os_invalidate_address(object->region.space_id, 221 object->region.address, 222 (acpi_size) object->region.length); 223 224 second_desc = acpi_ns_get_secondary_object(object); 225 if (second_desc) { 226 /* 227 * Free the region_context if and only if the handler is one of the 228 * default handlers -- and therefore, we created the context object 229 * locally, it was not created by an external caller. 230 */ 231 handler_desc = object->region.handler; 232 if (handler_desc) { 233 next_desc = 234 handler_desc->address_space.region_list; 235 last_obj_ptr = 236 &handler_desc->address_space.region_list; 237 238 /* Remove the region object from the handler's list */ 239 240 while (next_desc) { 241 if (next_desc == object) { 242 *last_obj_ptr = 243 next_desc->region.next; 244 break; 245 } 246 247 /* Walk the linked list of handler */ 248 249 last_obj_ptr = &next_desc->region.next; 250 next_desc = next_desc->region.next; 251 } 252 253 if (handler_desc->address_space.handler_flags & 254 ACPI_ADDR_HANDLER_DEFAULT_INSTALLED) { 255 256 /* Deactivate region and free region context */ 257 258 if (handler_desc->address_space.setup) { 259 (void)handler_desc-> 260 address_space.setup(object, 261 ACPI_REGION_DEACTIVATE, 262 handler_desc-> 263 address_space. 264 context, 265 &second_desc-> 266 extra. 267 region_context); 268 } 269 } 270 271 acpi_ut_remove_reference(handler_desc); 272 } 273 274 /* Now we can free the Extra object */ 275 276 acpi_ut_delete_object_desc(second_desc); 277 } 278 break; 279 280 case ACPI_TYPE_BUFFER_FIELD: 281 282 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, 283 "***** Buffer Field %p\n", object)); 284 285 second_desc = acpi_ns_get_secondary_object(object); 286 if (second_desc) { 287 acpi_ut_delete_object_desc(second_desc); 288 } 289 break; 290 291 case ACPI_TYPE_LOCAL_BANK_FIELD: 292 293 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, 294 "***** Bank Field %p\n", object)); 295 296 second_desc = acpi_ns_get_secondary_object(object); 297 if (second_desc) { 298 acpi_ut_delete_object_desc(second_desc); 299 } 300 break; 301 302 default: 303 break; 304 } 305 306 /* Free any allocated memory (pointer within the object) found above */ 307 308 if (obj_pointer) { 309 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, 310 "Deleting Object Subptr %p\n", obj_pointer)); 311 ACPI_FREE(obj_pointer); 312 } 313 314 /* Now the object can be safely deleted */ 315 316 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, "Deleting Object %p [%s]\n", 317 object, acpi_ut_get_object_type_name(object))); 318 319 acpi_ut_delete_object_desc(object); 320 return_VOID; 321} 322 323/******************************************************************************* 324 * 325 * FUNCTION: acpi_ut_delete_internal_object_list 326 * 327 * PARAMETERS: obj_list - Pointer to the list to be deleted 328 * 329 * RETURN: None 330 * 331 * DESCRIPTION: This function deletes an internal object list, including both 332 * simple objects and package objects 333 * 334 ******************************************************************************/ 335 336void acpi_ut_delete_internal_object_list(union acpi_operand_object **obj_list) 337{ 338 union acpi_operand_object **internal_obj; 339 340 ACPI_FUNCTION_TRACE(ut_delete_internal_object_list); 341 342 /* Walk the null-terminated internal list */ 343 344 for (internal_obj = obj_list; *internal_obj; internal_obj++) { 345 acpi_ut_remove_reference(*internal_obj); 346 } 347 348 /* Free the combined parameter pointer list and object array */ 349 350 ACPI_FREE(obj_list); 351 return_VOID; 352} 353 354/******************************************************************************* 355 * 356 * FUNCTION: acpi_ut_update_ref_count 357 * 358 * PARAMETERS: Object - Object whose ref count is to be updated 359 * Action - What to do 360 * 361 * RETURN: New ref count 362 * 363 * DESCRIPTION: Modify the ref count and return it. 364 * 365 ******************************************************************************/ 366 367static void 368acpi_ut_update_ref_count(union acpi_operand_object *object, u32 action) 369{ 370 u16 count; 371 u16 new_count; 372 373 ACPI_FUNCTION_NAME(ut_update_ref_count); 374 375 if (!object) { 376 return; 377 } 378 379 count = object->common.reference_count; 380 new_count = count; 381 382 /* 383 * Perform the reference count action (increment, decrement, force delete) 384 */ 385 switch (action) { 386 case REF_INCREMENT: 387 388 new_count++; 389 object->common.reference_count = new_count; 390 391 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, 392 "Obj %p Refs=%X, [Incremented]\n", 393 object, new_count)); 394 break; 395 396 case REF_DECREMENT: 397 398 if (count < 1) { 399 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, 400 "Obj %p Refs=%X, can't decrement! (Set to 0)\n", 401 object, new_count)); 402 403 new_count = 0; 404 } else { 405 new_count--; 406 407 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, 408 "Obj %p Refs=%X, [Decremented]\n", 409 object, new_count)); 410 } 411 412 if (object->common.type == ACPI_TYPE_METHOD) { 413 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, 414 "Method Obj %p Refs=%X, [Decremented]\n", 415 object, new_count)); 416 } 417 418 object->common.reference_count = new_count; 419 if (new_count == 0) { 420 acpi_ut_delete_internal_obj(object); 421 } 422 break; 423 424 case REF_FORCE_DELETE: 425 426 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, 427 "Obj %p Refs=%X, Force delete! (Set to 0)\n", 428 object, count)); 429 430 new_count = 0; 431 object->common.reference_count = new_count; 432 acpi_ut_delete_internal_obj(object); 433 break; 434 435 default: 436 437 ACPI_ERROR((AE_INFO, "Unknown action (0x%X)", action)); 438 break; 439 } 440 441 /* 442 * Sanity check the reference count, for debug purposes only. 443 * (A deleted object will have a huge reference count) 444 */ 445 if (count > ACPI_MAX_REFERENCE_COUNT) { 446 ACPI_WARNING((AE_INFO, 447 "Large Reference Count (0x%X) in object %p", 448 count, object)); 449 } 450} 451 452/******************************************************************************* 453 * 454 * FUNCTION: acpi_ut_update_object_reference 455 * 456 * PARAMETERS: Object - Increment ref count for this object 457 * and all sub-objects 458 * Action - Either REF_INCREMENT or REF_DECREMENT or 459 * REF_FORCE_DELETE 460 * 461 * RETURN: Status 462 * 463 * DESCRIPTION: Increment the object reference count 464 * 465 * Object references are incremented when: 466 * 1) An object is attached to a Node (namespace object) 467 * 2) An object is copied (all subobjects must be incremented) 468 * 469 * Object references are decremented when: 470 * 1) An object is detached from an Node 471 * 472 ******************************************************************************/ 473 474acpi_status 475acpi_ut_update_object_reference(union acpi_operand_object *object, u16 action) 476{ 477 acpi_status status = AE_OK; 478 union acpi_generic_state *state_list = NULL; 479 union acpi_operand_object *next_object = NULL; 480 union acpi_generic_state *state; 481 u32 i; 482 483 ACPI_FUNCTION_TRACE_PTR(ut_update_object_reference, object); 484 485 while (object) { 486 487 /* Make sure that this isn't a namespace handle */ 488 489 if (ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_NAMED) { 490 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, 491 "Object %p is NS handle\n", object)); 492 return_ACPI_STATUS(AE_OK); 493 } 494 495 /* 496 * All sub-objects must have their reference count incremented also. 497 * Different object types have different subobjects. 498 */ 499 switch (object->common.type) { 500 case ACPI_TYPE_DEVICE: 501 case ACPI_TYPE_PROCESSOR: 502 case ACPI_TYPE_POWER: 503 case ACPI_TYPE_THERMAL: 504 505 /* Update the notify objects for these types (if present) */ 506 507 acpi_ut_update_ref_count(object->common_notify. 508 system_notify, action); 509 acpi_ut_update_ref_count(object->common_notify. 510 device_notify, action); 511 break; 512 513 case ACPI_TYPE_PACKAGE: 514 /* 515 * We must update all the sub-objects of the package, 516 * each of whom may have their own sub-objects. 517 */ 518 for (i = 0; i < object->package.count; i++) { 519 /* 520 * Push each element onto the stack for later processing. 521 * Note: There can be null elements within the package, 522 * these are simply ignored 523 */ 524 status = 525 acpi_ut_create_update_state_and_push 526 (object->package.elements[i], action, 527 &state_list); 528 if (ACPI_FAILURE(status)) { 529 goto error_exit; 530 } 531 } 532 break; 533 534 case ACPI_TYPE_BUFFER_FIELD: 535 536 next_object = object->buffer_field.buffer_obj; 537 break; 538 539 case ACPI_TYPE_LOCAL_REGION_FIELD: 540 541 next_object = object->field.region_obj; 542 break; 543 544 case ACPI_TYPE_LOCAL_BANK_FIELD: 545 546 next_object = object->bank_field.bank_obj; 547 status = 548 acpi_ut_create_update_state_and_push(object-> 549 bank_field. 550 region_obj, 551 action, 552 &state_list); 553 if (ACPI_FAILURE(status)) { 554 goto error_exit; 555 } 556 break; 557 558 case ACPI_TYPE_LOCAL_INDEX_FIELD: 559 560 next_object = object->index_field.index_obj; 561 status = 562 acpi_ut_create_update_state_and_push(object-> 563 index_field. 564 data_obj, 565 action, 566 &state_list); 567 if (ACPI_FAILURE(status)) { 568 goto error_exit; 569 } 570 break; 571 572 case ACPI_TYPE_LOCAL_REFERENCE: 573 /* 574 * The target of an Index (a package, string, or buffer) or a named 575 * reference must track changes to the ref count of the index or 576 * target object. 577 */ 578 if ((object->reference.class == ACPI_REFCLASS_INDEX) || 579 (object->reference.class == ACPI_REFCLASS_NAME)) { 580 next_object = object->reference.object; 581 } 582 break; 583 584 case ACPI_TYPE_REGION: 585 default: 586 break; /* No subobjects for all other types */ 587 } 588 589 /* 590 * Now we can update the count in the main object. This can only 591 * happen after we update the sub-objects in case this causes the 592 * main object to be deleted. 593 */ 594 acpi_ut_update_ref_count(object, action); 595 object = NULL; 596 597 /* Move on to the next object to be updated */ 598 599 if (next_object) { 600 object = next_object; 601 next_object = NULL; 602 } else if (state_list) { 603 state = acpi_ut_pop_generic_state(&state_list); 604 object = state->update.object; 605 acpi_ut_delete_generic_state(state); 606 } 607 } 608 609 return_ACPI_STATUS(AE_OK); 610 611 error_exit: 612 613 ACPI_EXCEPTION((AE_INFO, status, 614 "Could not update object reference count")); 615 616 /* Free any stacked Update State objects */ 617 618 while (state_list) { 619 state = acpi_ut_pop_generic_state(&state_list); 620 acpi_ut_delete_generic_state(state); 621 } 622 623 return_ACPI_STATUS(status); 624} 625 626/******************************************************************************* 627 * 628 * FUNCTION: acpi_ut_add_reference 629 * 630 * PARAMETERS: Object - Object whose reference count is to be 631 * incremented 632 * 633 * RETURN: None 634 * 635 * DESCRIPTION: Add one reference to an ACPI object 636 * 637 ******************************************************************************/ 638 639void acpi_ut_add_reference(union acpi_operand_object *object) 640{ 641 642 ACPI_FUNCTION_TRACE_PTR(ut_add_reference, object); 643 644 /* Ensure that we have a valid object */ 645 646 if (!acpi_ut_valid_internal_object(object)) { 647 return_VOID; 648 } 649 650 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, 651 "Obj %p Current Refs=%X [To Be Incremented]\n", 652 object, object->common.reference_count)); 653 654 /* Increment the reference count */ 655 656 (void)acpi_ut_update_object_reference(object, REF_INCREMENT); 657 return_VOID; 658} 659 660/******************************************************************************* 661 * 662 * FUNCTION: acpi_ut_remove_reference 663 * 664 * PARAMETERS: Object - Object whose ref count will be decremented 665 * 666 * RETURN: None 667 * 668 * DESCRIPTION: Decrement the reference count of an ACPI internal object 669 * 670 ******************************************************************************/ 671 672void acpi_ut_remove_reference(union acpi_operand_object *object) 673{ 674 675 ACPI_FUNCTION_TRACE_PTR(ut_remove_reference, object); 676 677 /* 678 * Allow a NULL pointer to be passed in, just ignore it. This saves 679 * each caller from having to check. Also, ignore NS nodes. 680 * 681 */ 682 if (!object || 683 (ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_NAMED)) { 684 return_VOID; 685 } 686 687 /* Ensure that we have a valid object */ 688 689 if (!acpi_ut_valid_internal_object(object)) { 690 return_VOID; 691 } 692 693 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, 694 "Obj %p Current Refs=%X [To Be Decremented]\n", 695 object, object->common.reference_count)); 696 697 /* 698 * Decrement the reference count, and only actually delete the object 699 * if the reference count becomes 0. (Must also decrement the ref count 700 * of all subobjects!) 701 */ 702 (void)acpi_ut_update_object_reference(object, REF_DECREMENT); 703 return_VOID; 704} 705