1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 2 /******************************************************************************* 3 * 4 * Module Name: utdelete - object deletion and reference count utilities 5 * 6 ******************************************************************************/ 7 8 #include <acpi/acpi.h> 9 #include "accommon.h" 10 #include "acinterp.h" 11 #include "acnamesp.h" 12 #include "acevents.h" 13 14 #define _COMPONENT ACPI_UTILITIES 15 ACPI_MODULE_NAME("utdelete") 16 17 /* Local prototypes */ 18 static void acpi_ut_delete_internal_obj(union acpi_operand_object *object); 19 20 static void 21 acpi_ut_update_ref_count(union acpi_operand_object *object, u32 action); 22 23 /******************************************************************************* 24 * 25 * FUNCTION: acpi_ut_delete_internal_obj 26 * 27 * PARAMETERS: object - Object to be deleted 28 * 29 * RETURN: None 30 * 31 * DESCRIPTION: Low level object deletion, after reference counts have been 32 * updated (All reference counts, including sub-objects!) 33 * 34 ******************************************************************************/ 35 36 static void acpi_ut_delete_internal_obj(union acpi_operand_object *object) 37 { 38 void *obj_pointer = NULL; 39 union acpi_operand_object *handler_desc; 40 union acpi_operand_object *second_desc; 41 union acpi_operand_object *next_desc; 42 union acpi_operand_object *start_desc; 43 union acpi_operand_object **last_obj_ptr; 44 45 ACPI_FUNCTION_TRACE_PTR(ut_delete_internal_obj, object); 46 47 if (!object) { 48 return_VOID; 49 } 50 51 /* 52 * Must delete or free any pointers within the object that are not 53 * actual ACPI objects (for example, a raw buffer pointer). 54 */ 55 switch (object->common.type) { 56 case ACPI_TYPE_STRING: 57 58 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, 59 "**** String %p, ptr %p\n", object, 60 object->string.pointer)); 61 62 /* Free the actual string buffer */ 63 64 if (!(object->common.flags & AOPOBJ_STATIC_POINTER)) { 65 66 /* But only if it is NOT a pointer into an ACPI table */ 67 68 obj_pointer = object->string.pointer; 69 } 70 break; 71 72 case ACPI_TYPE_BUFFER: 73 74 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, 75 "**** Buffer %p, ptr %p\n", object, 76 object->buffer.pointer)); 77 78 /* Free the actual buffer */ 79 80 if (!(object->common.flags & AOPOBJ_STATIC_POINTER)) { 81 82 /* But only if it is NOT a pointer into an ACPI table */ 83 84 obj_pointer = object->buffer.pointer; 85 } 86 break; 87 88 case ACPI_TYPE_PACKAGE: 89 90 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, 91 " **** Package of count %X\n", 92 object->package.count)); 93 94 /* 95 * Elements of the package are not handled here, they are deleted 96 * separately 97 */ 98 99 /* Free the (variable length) element pointer array */ 100 101 obj_pointer = object->package.elements; 102 break; 103 104 /* 105 * These objects have a possible list of notify handlers. 106 * Device object also may have a GPE block. 107 */ 108 case ACPI_TYPE_DEVICE: 109 110 if (object->device.gpe_block) { 111 (void)acpi_ev_delete_gpe_block(object->device. 112 gpe_block); 113 } 114 115 /*lint -fallthrough */ 116 117 case ACPI_TYPE_PROCESSOR: 118 case ACPI_TYPE_THERMAL: 119 120 /* Walk the address handler list for this object */ 121 122 handler_desc = object->common_notify.handler; 123 while (handler_desc) { 124 next_desc = handler_desc->address_space.next; 125 acpi_ut_remove_reference(handler_desc); 126 handler_desc = next_desc; 127 } 128 break; 129 130 case ACPI_TYPE_MUTEX: 131 132 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, 133 "***** Mutex %p, OS Mutex %p\n", 134 object, object->mutex.os_mutex)); 135 136 if (object == acpi_gbl_global_lock_mutex) { 137 138 /* Global Lock has extra semaphore */ 139 140 (void) 141 acpi_os_delete_semaphore 142 (acpi_gbl_global_lock_semaphore); 143 acpi_gbl_global_lock_semaphore = NULL; 144 145 acpi_os_delete_mutex(object->mutex.os_mutex); 146 acpi_gbl_global_lock_mutex = NULL; 147 } else { 148 acpi_ex_unlink_mutex(object); 149 acpi_os_delete_mutex(object->mutex.os_mutex); 150 } 151 break; 152 153 case ACPI_TYPE_EVENT: 154 155 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, 156 "***** Event %p, OS Semaphore %p\n", 157 object, object->event.os_semaphore)); 158 159 (void)acpi_os_delete_semaphore(object->event.os_semaphore); 160 object->event.os_semaphore = NULL; 161 break; 162 163 case ACPI_TYPE_METHOD: 164 165 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, 166 "***** Method %p\n", object)); 167 168 /* Delete the method mutex if it exists */ 169 170 if (object->method.mutex) { 171 acpi_os_delete_mutex(object->method.mutex->mutex. 172 os_mutex); 173 acpi_ut_delete_object_desc(object->method.mutex); 174 object->method.mutex = NULL; 175 } 176 177 if (object->method.node) { 178 object->method.node = NULL; 179 } 180 break; 181 182 case ACPI_TYPE_REGION: 183 184 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, 185 "***** Region %p\n", object)); 186 187 /* 188 * Update address_range list. However, only permanent regions 189 * are installed in this list. (Not created within a method) 190 */ 191 if (!(object->region.node->flags & ANOBJ_TEMPORARY)) { 192 acpi_ut_remove_address_range(object->region.space_id, 193 object->region.node); 194 } 195 196 second_desc = acpi_ns_get_secondary_object(object); 197 if (second_desc) { 198 /* 199 * Free the region_context if and only if the handler is one of the 200 * default handlers -- and therefore, we created the context object 201 * locally, it was not created by an external caller. 202 */ 203 handler_desc = object->region.handler; 204 if (handler_desc) { 205 next_desc = 206 handler_desc->address_space.region_list; 207 start_desc = next_desc; 208 last_obj_ptr = 209 &handler_desc->address_space.region_list; 210 211 /* Remove the region object from the handler list */ 212 213 while (next_desc) { 214 if (next_desc == object) { 215 *last_obj_ptr = 216 next_desc->region.next; 217 break; 218 } 219 220 /* Walk the linked list of handlers */ 221 222 last_obj_ptr = &next_desc->region.next; 223 next_desc = next_desc->region.next; 224 225 /* Prevent infinite loop if list is corrupted */ 226 227 if (next_desc == start_desc) { 228 ACPI_ERROR((AE_INFO, 229 "Circular region list in address handler object %p", 230 handler_desc)); 231 return_VOID; 232 } 233 } 234 235 if (handler_desc->address_space.handler_flags & 236 ACPI_ADDR_HANDLER_DEFAULT_INSTALLED) { 237 238 /* Deactivate region and free region context */ 239 240 if (handler_desc->address_space.setup) { 241 (void)handler_desc-> 242 address_space.setup(object, 243 ACPI_REGION_DEACTIVATE, 244 handler_desc-> 245 address_space. 246 context, 247 &second_desc-> 248 extra. 249 region_context); 250 } 251 } 252 253 acpi_ut_remove_reference(handler_desc); 254 } 255 256 /* Now we can free the Extra object */ 257 258 acpi_ut_delete_object_desc(second_desc); 259 } 260 break; 261 262 case ACPI_TYPE_BUFFER_FIELD: 263 264 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, 265 "***** Buffer Field %p\n", object)); 266 267 second_desc = acpi_ns_get_secondary_object(object); 268 if (second_desc) { 269 acpi_ut_delete_object_desc(second_desc); 270 } 271 break; 272 273 case ACPI_TYPE_LOCAL_BANK_FIELD: 274 275 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, 276 "***** Bank Field %p\n", object)); 277 278 second_desc = acpi_ns_get_secondary_object(object); 279 if (second_desc) { 280 acpi_ut_delete_object_desc(second_desc); 281 } 282 break; 283 284 default: 285 286 break; 287 } 288 289 /* Free any allocated memory (pointer within the object) found above */ 290 291 if (obj_pointer) { 292 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, 293 "Deleting Object Subptr %p\n", obj_pointer)); 294 ACPI_FREE(obj_pointer); 295 } 296 297 /* Now the object can be safely deleted */ 298 299 ACPI_DEBUG_PRINT_RAW((ACPI_DB_ALLOCATIONS, 300 "%s: Deleting Object %p [%s]\n", 301 ACPI_GET_FUNCTION_NAME, object, 302 acpi_ut_get_object_type_name(object))); 303 304 acpi_ut_delete_object_desc(object); 305 return_VOID; 306 } 307 308 /******************************************************************************* 309 * 310 * FUNCTION: acpi_ut_delete_internal_object_list 311 * 312 * PARAMETERS: obj_list - Pointer to the list to be deleted 313 * 314 * RETURN: None 315 * 316 * DESCRIPTION: This function deletes an internal object list, including both 317 * simple objects and package objects 318 * 319 ******************************************************************************/ 320 321 void acpi_ut_delete_internal_object_list(union acpi_operand_object **obj_list) 322 { 323 union acpi_operand_object **internal_obj; 324 325 ACPI_FUNCTION_ENTRY(); 326 327 /* Walk the null-terminated internal list */ 328 329 for (internal_obj = obj_list; *internal_obj; internal_obj++) { 330 acpi_ut_remove_reference(*internal_obj); 331 } 332 333 /* Free the combined parameter pointer list and object array */ 334 335 ACPI_FREE(obj_list); 336 return; 337 } 338 339 /******************************************************************************* 340 * 341 * FUNCTION: acpi_ut_update_ref_count 342 * 343 * PARAMETERS: object - Object whose ref count is to be updated 344 * action - What to do (REF_INCREMENT or REF_DECREMENT) 345 * 346 * RETURN: None. Sets new reference count within the object 347 * 348 * DESCRIPTION: Modify the reference count for an internal acpi object 349 * 350 ******************************************************************************/ 351 352 static void 353 acpi_ut_update_ref_count(union acpi_operand_object *object, u32 action) 354 { 355 u16 original_count; 356 u16 new_count = 0; 357 acpi_cpu_flags lock_flags; 358 char *message; 359 360 ACPI_FUNCTION_NAME(ut_update_ref_count); 361 362 if (!object) { 363 return; 364 } 365 366 /* 367 * Always get the reference count lock. Note: Interpreter and/or 368 * Namespace is not always locked when this function is called. 369 */ 370 lock_flags = acpi_os_acquire_lock(acpi_gbl_reference_count_lock); 371 original_count = object->common.reference_count; 372 373 /* Perform the reference count action (increment, decrement) */ 374 375 switch (action) { 376 case REF_INCREMENT: 377 378 new_count = original_count + 1; 379 object->common.reference_count = new_count; 380 acpi_os_release_lock(acpi_gbl_reference_count_lock, lock_flags); 381 382 /* The current reference count should never be zero here */ 383 384 if (!original_count) { 385 ACPI_WARNING((AE_INFO, 386 "Obj %p, Reference Count was zero before increment\n", 387 object)); 388 } 389 390 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, 391 "Obj %p Type %.2X [%s] Refs %.2X [Incremented]\n", 392 object, object->common.type, 393 acpi_ut_get_object_type_name(object), 394 new_count)); 395 message = "Incremement"; 396 break; 397 398 case REF_DECREMENT: 399 400 /* The current reference count must be non-zero */ 401 402 if (original_count) { 403 new_count = original_count - 1; 404 object->common.reference_count = new_count; 405 } 406 407 acpi_os_release_lock(acpi_gbl_reference_count_lock, lock_flags); 408 409 if (!original_count) { 410 ACPI_WARNING((AE_INFO, 411 "Obj %p, Reference Count is already zero, cannot decrement\n", 412 object)); 413 } 414 415 ACPI_DEBUG_PRINT_RAW((ACPI_DB_ALLOCATIONS, 416 "%s: Obj %p Type %.2X Refs %.2X [Decremented]\n", 417 ACPI_GET_FUNCTION_NAME, object, 418 object->common.type, new_count)); 419 420 /* Actually delete the object on a reference count of zero */ 421 422 if (new_count == 0) { 423 acpi_ut_delete_internal_obj(object); 424 } 425 message = "Decrement"; 426 break; 427 428 default: 429 430 acpi_os_release_lock(acpi_gbl_reference_count_lock, lock_flags); 431 ACPI_ERROR((AE_INFO, "Unknown Reference Count action (0x%X)", 432 action)); 433 return; 434 } 435 436 /* 437 * Sanity check the reference count, for debug purposes only. 438 * (A deleted object will have a huge reference count) 439 */ 440 if (new_count > ACPI_MAX_REFERENCE_COUNT) { 441 ACPI_WARNING((AE_INFO, 442 "Large Reference Count (0x%X) in object %p, Type=0x%.2X Operation=%s", 443 new_count, object, object->common.type, message)); 444 } 445 } 446 447 /******************************************************************************* 448 * 449 * FUNCTION: acpi_ut_update_object_reference 450 * 451 * PARAMETERS: object - Increment ref count for this object 452 * and all sub-objects 453 * action - Either REF_INCREMENT or REF_DECREMENT 454 * 455 * RETURN: Status 456 * 457 * DESCRIPTION: Increment the object reference count 458 * 459 * Object references are incremented when: 460 * 1) An object is attached to a Node (namespace object) 461 * 2) An object is copied (all subobjects must be incremented) 462 * 463 * Object references are decremented when: 464 * 1) An object is detached from an Node 465 * 466 ******************************************************************************/ 467 468 acpi_status 469 acpi_ut_update_object_reference(union acpi_operand_object *object, u16 action) 470 { 471 acpi_status status = AE_OK; 472 union acpi_generic_state *state_list = NULL; 473 union acpi_operand_object *next_object = NULL; 474 union acpi_operand_object *prev_object; 475 union acpi_generic_state *state; 476 u32 i; 477 478 ACPI_FUNCTION_NAME(ut_update_object_reference); 479 480 while (object) { 481 482 /* Make sure that this isn't a namespace handle */ 483 484 if (ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_NAMED) { 485 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, 486 "Object %p is NS handle\n", object)); 487 return (AE_OK); 488 } 489 490 /* 491 * All sub-objects must have their reference count incremented 492 * also. Different object types have different subobjects. 493 */ 494 switch (object->common.type) { 495 case ACPI_TYPE_DEVICE: 496 case ACPI_TYPE_PROCESSOR: 497 case ACPI_TYPE_POWER: 498 case ACPI_TYPE_THERMAL: 499 /* 500 * Update the notify objects for these types (if present) 501 * Two lists, system and device notify handlers. 502 */ 503 for (i = 0; i < ACPI_NUM_NOTIFY_TYPES; i++) { 504 prev_object = 505 object->common_notify.notify_list[i]; 506 while (prev_object) { 507 next_object = 508 prev_object->notify.next[i]; 509 acpi_ut_update_ref_count(prev_object, 510 action); 511 prev_object = next_object; 512 } 513 } 514 break; 515 516 case ACPI_TYPE_PACKAGE: 517 /* 518 * We must update all the sub-objects of the package, 519 * each of whom may have their own sub-objects. 520 */ 521 for (i = 0; i < object->package.count; i++) { 522 /* 523 * Null package elements are legal and can be simply 524 * ignored. 525 */ 526 next_object = object->package.elements[i]; 527 if (!next_object) { 528 continue; 529 } 530 531 switch (next_object->common.type) { 532 case ACPI_TYPE_INTEGER: 533 case ACPI_TYPE_STRING: 534 case ACPI_TYPE_BUFFER: 535 /* 536 * For these very simple sub-objects, we can just 537 * update the reference count here and continue. 538 * Greatly increases performance of this operation. 539 */ 540 acpi_ut_update_ref_count(next_object, 541 action); 542 break; 543 544 default: 545 /* 546 * For complex sub-objects, push them onto the stack 547 * for later processing (this eliminates recursion.) 548 */ 549 status = 550 acpi_ut_create_update_state_and_push 551 (next_object, action, &state_list); 552 if (ACPI_FAILURE(status)) { 553 goto error_exit; 554 } 555 break; 556 } 557 } 558 next_object = NULL; 559 break; 560 561 case ACPI_TYPE_BUFFER_FIELD: 562 563 next_object = object->buffer_field.buffer_obj; 564 break; 565 566 case ACPI_TYPE_LOCAL_REGION_FIELD: 567 568 next_object = object->field.region_obj; 569 break; 570 571 case ACPI_TYPE_LOCAL_BANK_FIELD: 572 573 next_object = object->bank_field.bank_obj; 574 status = 575 acpi_ut_create_update_state_and_push(object-> 576 bank_field. 577 region_obj, 578 action, 579 &state_list); 580 if (ACPI_FAILURE(status)) { 581 goto error_exit; 582 } 583 break; 584 585 case ACPI_TYPE_LOCAL_INDEX_FIELD: 586 587 next_object = object->index_field.index_obj; 588 status = 589 acpi_ut_create_update_state_and_push(object-> 590 index_field. 591 data_obj, 592 action, 593 &state_list); 594 if (ACPI_FAILURE(status)) { 595 goto error_exit; 596 } 597 break; 598 599 case ACPI_TYPE_LOCAL_REFERENCE: 600 /* 601 * The target of an Index (a package, string, or buffer) or a named 602 * reference must track changes to the ref count of the index or 603 * target object. 604 */ 605 if ((object->reference.class == ACPI_REFCLASS_INDEX) || 606 (object->reference.class == ACPI_REFCLASS_NAME)) { 607 next_object = object->reference.object; 608 } 609 break; 610 611 case ACPI_TYPE_REGION: 612 default: 613 614 break; /* No subobjects for all other types */ 615 } 616 617 /* 618 * Now we can update the count in the main object. This can only 619 * happen after we update the sub-objects in case this causes the 620 * main object to be deleted. 621 */ 622 acpi_ut_update_ref_count(object, action); 623 object = NULL; 624 625 /* Move on to the next object to be updated */ 626 627 if (next_object) { 628 object = next_object; 629 next_object = NULL; 630 } else if (state_list) { 631 state = acpi_ut_pop_generic_state(&state_list); 632 object = state->update.object; 633 acpi_ut_delete_generic_state(state); 634 } 635 } 636 637 return (AE_OK); 638 639 error_exit: 640 641 ACPI_EXCEPTION((AE_INFO, status, 642 "Could not update object reference count")); 643 644 /* Free any stacked Update State objects */ 645 646 while (state_list) { 647 state = acpi_ut_pop_generic_state(&state_list); 648 acpi_ut_delete_generic_state(state); 649 } 650 651 return (status); 652 } 653 654 /******************************************************************************* 655 * 656 * FUNCTION: acpi_ut_add_reference 657 * 658 * PARAMETERS: object - Object whose reference count is to be 659 * incremented 660 * 661 * RETURN: None 662 * 663 * DESCRIPTION: Add one reference to an ACPI object 664 * 665 ******************************************************************************/ 666 667 void acpi_ut_add_reference(union acpi_operand_object *object) 668 { 669 670 ACPI_FUNCTION_NAME(ut_add_reference); 671 672 /* Ensure that we have a valid object */ 673 674 if (!acpi_ut_valid_internal_object(object)) { 675 return; 676 } 677 678 ACPI_DEBUG_PRINT((ACPI_DB_ALLOCATIONS, 679 "Obj %p Current Refs=%X [To Be Incremented]\n", 680 object, object->common.reference_count)); 681 682 /* Increment the reference count */ 683 684 (void)acpi_ut_update_object_reference(object, REF_INCREMENT); 685 return; 686 } 687 688 /******************************************************************************* 689 * 690 * FUNCTION: acpi_ut_remove_reference 691 * 692 * PARAMETERS: object - Object whose ref count will be decremented 693 * 694 * RETURN: None 695 * 696 * DESCRIPTION: Decrement the reference count of an ACPI internal object 697 * 698 ******************************************************************************/ 699 700 void acpi_ut_remove_reference(union acpi_operand_object *object) 701 { 702 703 ACPI_FUNCTION_NAME(ut_remove_reference); 704 705 /* 706 * Allow a NULL pointer to be passed in, just ignore it. This saves 707 * each caller from having to check. Also, ignore NS nodes. 708 */ 709 if (!object || 710 (ACPI_GET_DESCRIPTOR_TYPE(object) == ACPI_DESC_TYPE_NAMED)) { 711 return; 712 } 713 714 /* Ensure that we have a valid object */ 715 716 if (!acpi_ut_valid_internal_object(object)) { 717 return; 718 } 719 720 ACPI_DEBUG_PRINT_RAW((ACPI_DB_ALLOCATIONS, 721 "%s: Obj %p Current Refs=%X [To Be Decremented]\n", 722 ACPI_GET_FUNCTION_NAME, object, 723 object->common.reference_count)); 724 725 /* 726 * Decrement the reference count, and only actually delete the object 727 * if the reference count becomes 0. (Must also decrement the ref count 728 * of all subobjects!) 729 */ 730 (void)acpi_ut_update_object_reference(object, REF_DECREMENT); 731 return; 732 } 733