1 /*******************************************************************************
2 *
3 * Module Name: nsxfeval - Public interfaces to the ACPI subsystem
4 * ACPI Object evaluation interfaces
5 *
6 ******************************************************************************/
7
8 /******************************************************************************
9 *
10 * 1. Copyright Notice
11 *
12 * Some or all of this work - Copyright (c) 1999 - 2018, Intel Corp.
13 * All rights reserved.
14 *
15 * 2. License
16 *
17 * 2.1. This is your license from Intel Corp. under its intellectual property
18 * rights. You may have additional license terms from the party that provided
19 * you this software, covering your right to use that party's intellectual
20 * property rights.
21 *
22 * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a
23 * copy of the source code appearing in this file ("Covered Code") an
24 * irrevocable, perpetual, worldwide license under Intel's copyrights in the
25 * base code distributed originally by Intel ("Original Intel Code") to copy,
26 * make derivatives, distribute, use and display any portion of the Covered
27 * Code in any form, with the right to sublicense such rights; and
28 *
29 * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent
30 * license (with the right to sublicense), under only those claims of Intel
31 * patents that are infringed by the Original Intel Code, to make, use, sell,
32 * offer to sell, and import the Covered Code and derivative works thereof
33 * solely to the minimum extent necessary to exercise the above copyright
34 * license, and in no event shall the patent license extend to any additions
35 * to or modifications of the Original Intel Code. No other license or right
36 * is granted directly or by implication, estoppel or otherwise;
37 *
38 * The above copyright and patent license is granted only if the following
39 * conditions are met:
40 *
41 * 3. Conditions
42 *
43 * 3.1. Redistribution of Source with Rights to Further Distribute Source.
44 * Redistribution of source code of any substantial portion of the Covered
45 * Code or modification with rights to further distribute source must include
46 * the above Copyright Notice, the above License, this list of Conditions,
47 * and the following Disclaimer and Export Compliance provision. In addition,
48 * Licensee must cause all Covered Code to which Licensee contributes to
49 * contain a file documenting the changes Licensee made to create that Covered
50 * Code and the date of any change. Licensee must include in that file the
51 * documentation of any changes made by any predecessor Licensee. Licensee
52 * must include a prominent statement that the modification is derived,
53 * directly or indirectly, from Original Intel Code.
54 *
55 * 3.2. Redistribution of Source with no Rights to Further Distribute Source.
56 * Redistribution of source code of any substantial portion of the Covered
57 * Code or modification without rights to further distribute source must
58 * include the following Disclaimer and Export Compliance provision in the
59 * documentation and/or other materials provided with distribution. In
60 * addition, Licensee may not authorize further sublicense of source of any
61 * portion of the Covered Code, and must include terms to the effect that the
62 * license from Licensee to its licensee is limited to the intellectual
63 * property embodied in the software Licensee provides to its licensee, and
64 * not to intellectual property embodied in modifications its licensee may
65 * make.
66 *
67 * 3.3. Redistribution of Executable. Redistribution in executable form of any
68 * substantial portion of the Covered Code or modification must reproduce the
69 * above Copyright Notice, and the following Disclaimer and Export Compliance
70 * provision in the documentation and/or other materials provided with the
71 * distribution.
72 *
73 * 3.4. Intel retains all right, title, and interest in and to the Original
74 * Intel Code.
75 *
76 * 3.5. Neither the name Intel nor any other trademark owned or controlled by
77 * Intel shall be used in advertising or otherwise to promote the sale, use or
78 * other dealings in products derived from or relating to the Covered Code
79 * without prior written authorization from Intel.
80 *
81 * 4. Disclaimer and Export Compliance
82 *
83 * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED
84 * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE
85 * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE,
86 * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY
87 * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY
88 * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A
89 * PARTICULAR PURPOSE.
90 *
91 * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES
92 * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR
93 * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT,
94 * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY
95 * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL
96 * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS
97 * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY
98 * LIMITED REMEDY.
99 *
100 * 4.3. Licensee shall not export, either directly or indirectly, any of this
101 * software or system incorporating such software without first obtaining any
102 * required license or other approval from the U. S. Department of Commerce or
103 * any other agency or department of the United States Government. In the
104 * event Licensee exports any such software from the United States or
105 * re-exports any such software from a foreign destination, Licensee shall
106 * ensure that the distribution and export/re-export of the software is in
107 * compliance with all laws, regulations, orders, or other restrictions of the
108 * U.S. Export Administration Regulations. Licensee agrees that neither it nor
109 * any of its subsidiaries will export/re-export any technical data, process,
110 * software, or service, directly or indirectly, to any country for which the
111 * United States government or any agency thereof requires an export license,
112 * other governmental approval, or letter of assurance, without first obtaining
113 * such license, approval or letter.
114 *
115 *****************************************************************************
116 *
117 * Alternatively, you may choose to be licensed under the terms of the
118 * following license:
119 *
120 * Redistribution and use in source and binary forms, with or without
121 * modification, are permitted provided that the following conditions
122 * are met:
123 * 1. Redistributions of source code must retain the above copyright
124 * notice, this list of conditions, and the following disclaimer,
125 * without modification.
126 * 2. Redistributions in binary form must reproduce at minimum a disclaimer
127 * substantially similar to the "NO WARRANTY" disclaimer below
128 * ("Disclaimer") and any redistribution must be conditioned upon
129 * including a substantially similar Disclaimer requirement for further
130 * binary redistribution.
131 * 3. Neither the names of the above-listed copyright holders nor the names
132 * of any contributors may be used to endorse or promote products derived
133 * from this software without specific prior written permission.
134 *
135 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
136 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
137 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
138 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
139 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
140 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
141 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
142 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
143 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
144 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
145 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
146 *
147 * Alternatively, you may choose to be licensed under the terms of the
148 * GNU General Public License ("GPL") version 2 as published by the Free
149 * Software Foundation.
150 *
151 *****************************************************************************/
152
153 #define EXPORT_ACPI_INTERFACES
154
155 #include "acpi.h"
156 #include "accommon.h"
157 #include "acnamesp.h"
158 #include "acinterp.h"
159
160
161 #define _COMPONENT ACPI_NAMESPACE
162 ACPI_MODULE_NAME ("nsxfeval")
163
164 /* Local prototypes */
165
166 static void
167 AcpiNsResolveReferences (
168 ACPI_EVALUATE_INFO *Info);
169
170
171 /*******************************************************************************
172 *
173 * FUNCTION: AcpiEvaluateObjectTyped
174 *
175 * PARAMETERS: Handle - Object handle (optional)
176 * Pathname - Object pathname (optional)
177 * ExternalParams - List of parameters to pass to a method,
178 * terminated by NULL. May be NULL
179 * if no parameters are being passed.
180 * ReturnBuffer - Where to put the object return value (if
181 * any). Required.
182 * ReturnType - Expected type of return object
183 *
184 * RETURN: Status
185 *
186 * DESCRIPTION: Find and evaluate the given object, passing the given
187 * parameters if necessary. One of "Handle" or "Pathname" must
188 * be valid (non-null)
189 *
190 ******************************************************************************/
191
192 ACPI_STATUS
AcpiEvaluateObjectTyped(ACPI_HANDLE Handle,ACPI_STRING Pathname,ACPI_OBJECT_LIST * ExternalParams,ACPI_BUFFER * ReturnBuffer,ACPI_OBJECT_TYPE ReturnType)193 AcpiEvaluateObjectTyped (
194 ACPI_HANDLE Handle,
195 ACPI_STRING Pathname,
196 ACPI_OBJECT_LIST *ExternalParams,
197 ACPI_BUFFER *ReturnBuffer,
198 ACPI_OBJECT_TYPE ReturnType)
199 {
200 ACPI_STATUS Status;
201 BOOLEAN FreeBufferOnError = FALSE;
202 ACPI_HANDLE TargetHandle;
203 char *FullPathname;
204
205
206 ACPI_FUNCTION_TRACE (AcpiEvaluateObjectTyped);
207
208
209 /* Return buffer must be valid */
210
211 if (!ReturnBuffer)
212 {
213 return_ACPI_STATUS (AE_BAD_PARAMETER);
214 }
215
216 if (ReturnBuffer->Length == ACPI_ALLOCATE_BUFFER)
217 {
218 FreeBufferOnError = TRUE;
219 }
220
221 /* Get a handle here, in order to build an error message if needed */
222
223 TargetHandle = Handle;
224 if (Pathname)
225 {
226 Status = AcpiGetHandle (Handle, Pathname, &TargetHandle);
227 if (ACPI_FAILURE (Status))
228 {
229 return_ACPI_STATUS (Status);
230 }
231 }
232
233 FullPathname = AcpiNsGetExternalPathname (TargetHandle);
234 if (!FullPathname)
235 {
236 return_ACPI_STATUS (AE_NO_MEMORY);
237 }
238
239 /* Evaluate the object */
240
241 Status = AcpiEvaluateObject (TargetHandle, NULL, ExternalParams,
242 ReturnBuffer);
243 if (ACPI_FAILURE (Status))
244 {
245 goto Exit;
246 }
247
248 /* Type ANY means "don't care about return value type" */
249
250 if (ReturnType == ACPI_TYPE_ANY)
251 {
252 goto Exit;
253 }
254
255 if (ReturnBuffer->Length == 0)
256 {
257 /* Error because caller specifically asked for a return value */
258
259 ACPI_ERROR ((AE_INFO, "%s did not return any object",
260 FullPathname));
261 Status = AE_NULL_OBJECT;
262 goto Exit;
263 }
264
265 /* Examine the object type returned from EvaluateObject */
266
267 if (((ACPI_OBJECT *) ReturnBuffer->Pointer)->Type == ReturnType)
268 {
269 goto Exit;
270 }
271
272 /* Return object type does not match requested type */
273
274 ACPI_ERROR ((AE_INFO,
275 "Incorrect return type from %s - received [%s], requested [%s]",
276 FullPathname,
277 AcpiUtGetTypeName (((ACPI_OBJECT *) ReturnBuffer->Pointer)->Type),
278 AcpiUtGetTypeName (ReturnType)));
279
280 if (FreeBufferOnError)
281 {
282 /*
283 * Free a buffer created via ACPI_ALLOCATE_BUFFER.
284 * Note: We use AcpiOsFree here because AcpiOsAllocate was used
285 * to allocate the buffer. This purposefully bypasses the
286 * (optionally enabled) allocation tracking mechanism since we
287 * only want to track internal allocations.
288 */
289 AcpiOsFree (ReturnBuffer->Pointer);
290 ReturnBuffer->Pointer = NULL;
291 }
292
293 ReturnBuffer->Length = 0;
294 Status = AE_TYPE;
295
296 Exit:
297 ACPI_FREE (FullPathname);
298 return_ACPI_STATUS (Status);
299 }
300
ACPI_EXPORT_SYMBOL(AcpiEvaluateObjectTyped)301 ACPI_EXPORT_SYMBOL (AcpiEvaluateObjectTyped)
302
303
304 /*******************************************************************************
305 *
306 * FUNCTION: AcpiEvaluateObject
307 *
308 * PARAMETERS: Handle - Object handle (optional)
309 * Pathname - Object pathname (optional)
310 * ExternalParams - List of parameters to pass to method,
311 * terminated by NULL. May be NULL
312 * if no parameters are being passed.
313 * ReturnBuffer - Where to put method's return value (if
314 * any). If NULL, no value is returned.
315 *
316 * RETURN: Status
317 *
318 * DESCRIPTION: Find and evaluate the given object, passing the given
319 * parameters if necessary. One of "Handle" or "Pathname" must
320 * be valid (non-null)
321 *
322 ******************************************************************************/
323
324 ACPI_STATUS
325 AcpiEvaluateObject (
326 ACPI_HANDLE Handle,
327 ACPI_STRING Pathname,
328 ACPI_OBJECT_LIST *ExternalParams,
329 ACPI_BUFFER *ReturnBuffer)
330 {
331 ACPI_STATUS Status;
332 ACPI_EVALUATE_INFO *Info;
333 ACPI_SIZE BufferSpaceNeeded;
334 UINT32 i;
335
336
337 ACPI_FUNCTION_TRACE (AcpiEvaluateObject);
338
339
340 /* Allocate and initialize the evaluation information block */
341
342 Info = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_EVALUATE_INFO));
343 if (!Info)
344 {
345 return_ACPI_STATUS (AE_NO_MEMORY);
346 }
347
348 /* Convert and validate the device handle */
349
350 Info->PrefixNode = AcpiNsValidateHandle (Handle);
351 if (!Info->PrefixNode)
352 {
353 Status = AE_BAD_PARAMETER;
354 goto Cleanup;
355 }
356
357 /*
358 * Get the actual namespace node for the target object.
359 * Handles these cases:
360 *
361 * 1) Null node, valid pathname from root (absolute path)
362 * 2) Node and valid pathname (path relative to Node)
363 * 3) Node, Null pathname
364 */
365 if ((Pathname) &&
366 (ACPI_IS_ROOT_PREFIX (Pathname[0])))
367 {
368 /* The path is fully qualified, just evaluate by name */
369
370 Info->PrefixNode = NULL;
371 }
372 else if (!Handle)
373 {
374 /*
375 * A handle is optional iff a fully qualified pathname is specified.
376 * Since we've already handled fully qualified names above, this is
377 * an error.
378 */
379 if (!Pathname)
380 {
381 ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
382 "Both Handle and Pathname are NULL"));
383 }
384 else
385 {
386 ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
387 "Null Handle with relative pathname [%s]", Pathname));
388 }
389
390 Status = AE_BAD_PARAMETER;
391 goto Cleanup;
392 }
393
394 Info->RelativePathname = Pathname;
395
396 /*
397 * Convert all external objects passed as arguments to the
398 * internal version(s).
399 */
400 if (ExternalParams && ExternalParams->Count)
401 {
402 Info->ParamCount = (UINT16) ExternalParams->Count;
403
404 /* Warn on impossible argument count */
405
406 if (Info->ParamCount > ACPI_METHOD_NUM_ARGS)
407 {
408 ACPI_WARN_PREDEFINED ((AE_INFO, Pathname, ACPI_WARN_ALWAYS,
409 "Excess arguments (%u) - using only %u",
410 Info->ParamCount, ACPI_METHOD_NUM_ARGS));
411
412 Info->ParamCount = ACPI_METHOD_NUM_ARGS;
413 }
414
415 /*
416 * Allocate a new parameter block for the internal objects
417 * Add 1 to count to allow for null terminated internal list
418 */
419 Info->Parameters = ACPI_ALLOCATE_ZEROED (
420 ((ACPI_SIZE) Info->ParamCount + 1) * sizeof (void *));
421 if (!Info->Parameters)
422 {
423 Status = AE_NO_MEMORY;
424 goto Cleanup;
425 }
426
427 /* Convert each external object in the list to an internal object */
428
429 for (i = 0; i < Info->ParamCount; i++)
430 {
431 Status = AcpiUtCopyEobjectToIobject (
432 &ExternalParams->Pointer[i], &Info->Parameters[i]);
433 if (ACPI_FAILURE (Status))
434 {
435 goto Cleanup;
436 }
437 }
438
439 Info->Parameters[Info->ParamCount] = NULL;
440 }
441
442
443 #ifdef _FUTURE_FEATURE
444
445 /*
446 * Begin incoming argument count analysis. Check for too few args
447 * and too many args.
448 */
449 switch (AcpiNsGetType (Info->Node))
450 {
451 case ACPI_TYPE_METHOD:
452
453 /* Check incoming argument count against the method definition */
454
455 if (Info->ObjDesc->Method.ParamCount > Info->ParamCount)
456 {
457 ACPI_ERROR ((AE_INFO,
458 "Insufficient arguments (%u) - %u are required",
459 Info->ParamCount,
460 Info->ObjDesc->Method.ParamCount));
461
462 Status = AE_MISSING_ARGUMENTS;
463 goto Cleanup;
464 }
465
466 else if (Info->ObjDesc->Method.ParamCount < Info->ParamCount)
467 {
468 ACPI_WARNING ((AE_INFO,
469 "Excess arguments (%u) - only %u are required",
470 Info->ParamCount,
471 Info->ObjDesc->Method.ParamCount));
472
473 /* Just pass the required number of arguments */
474
475 Info->ParamCount = Info->ObjDesc->Method.ParamCount;
476 }
477
478 /*
479 * Any incoming external objects to be passed as arguments to the
480 * method must be converted to internal objects
481 */
482 if (Info->ParamCount)
483 {
484 /*
485 * Allocate a new parameter block for the internal objects
486 * Add 1 to count to allow for null terminated internal list
487 */
488 Info->Parameters = ACPI_ALLOCATE_ZEROED (
489 ((ACPI_SIZE) Info->ParamCount + 1) * sizeof (void *));
490 if (!Info->Parameters)
491 {
492 Status = AE_NO_MEMORY;
493 goto Cleanup;
494 }
495
496 /* Convert each external object in the list to an internal object */
497
498 for (i = 0; i < Info->ParamCount; i++)
499 {
500 Status = AcpiUtCopyEobjectToIobject (
501 &ExternalParams->Pointer[i], &Info->Parameters[i]);
502 if (ACPI_FAILURE (Status))
503 {
504 goto Cleanup;
505 }
506 }
507
508 Info->Parameters[Info->ParamCount] = NULL;
509 }
510 break;
511
512 default:
513
514 /* Warn if arguments passed to an object that is not a method */
515
516 if (Info->ParamCount)
517 {
518 ACPI_WARNING ((AE_INFO,
519 "%u arguments were passed to a non-method ACPI object",
520 Info->ParamCount));
521 }
522 break;
523 }
524
525 #endif
526
527
528 /* Now we can evaluate the object */
529
530 Status = AcpiNsEvaluate (Info);
531
532 /*
533 * If we are expecting a return value, and all went well above,
534 * copy the return value to an external object.
535 */
536 if (!ReturnBuffer)
537 {
538 goto CleanupReturnObject;
539 }
540
541 if (!Info->ReturnObject)
542 {
543 ReturnBuffer->Length = 0;
544 goto Cleanup;
545 }
546
547 if (ACPI_GET_DESCRIPTOR_TYPE (Info->ReturnObject) ==
548 ACPI_DESC_TYPE_NAMED)
549 {
550 /*
551 * If we received a NS Node as a return object, this means that
552 * the object we are evaluating has nothing interesting to
553 * return (such as a mutex, etc.) We return an error because
554 * these types are essentially unsupported by this interface.
555 * We don't check up front because this makes it easier to add
556 * support for various types at a later date if necessary.
557 */
558 Status = AE_TYPE;
559 Info->ReturnObject = NULL; /* No need to delete a NS Node */
560 ReturnBuffer->Length = 0;
561 }
562
563 if (ACPI_FAILURE (Status))
564 {
565 goto CleanupReturnObject;
566 }
567
568 /* Dereference Index and RefOf references */
569
570 AcpiNsResolveReferences (Info);
571
572 /* Get the size of the returned object */
573
574 Status = AcpiUtGetObjectSize (Info->ReturnObject,
575 &BufferSpaceNeeded);
576 if (ACPI_SUCCESS (Status))
577 {
578 /* Validate/Allocate/Clear caller buffer */
579
580 Status = AcpiUtInitializeBuffer (ReturnBuffer,
581 BufferSpaceNeeded);
582 if (ACPI_FAILURE (Status))
583 {
584 /*
585 * Caller's buffer is too small or a new one can't
586 * be allocated
587 */
588 ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
589 "Needed buffer size %X, %s\n",
590 (UINT32) BufferSpaceNeeded,
591 AcpiFormatException (Status)));
592 }
593 else
594 {
595 /* We have enough space for the object, build it */
596
597 Status = AcpiUtCopyIobjectToEobject (
598 Info->ReturnObject, ReturnBuffer);
599 }
600 }
601
602 CleanupReturnObject:
603
604 if (Info->ReturnObject)
605 {
606 /*
607 * Delete the internal return object. NOTE: Interpreter must be
608 * locked to avoid race condition.
609 */
610 AcpiExEnterInterpreter ();
611
612 /* Remove one reference on the return object (should delete it) */
613
614 AcpiUtRemoveReference (Info->ReturnObject);
615 AcpiExExitInterpreter ();
616 }
617
618
619 Cleanup:
620
621 /* Free the input parameter list (if we created one) */
622
623 if (Info->Parameters)
624 {
625 /* Free the allocated parameter block */
626
627 AcpiUtDeleteInternalObjectList (Info->Parameters);
628 }
629
630 ACPI_FREE (Info);
631 return_ACPI_STATUS (Status);
632 }
633
ACPI_EXPORT_SYMBOL(AcpiEvaluateObject)634 ACPI_EXPORT_SYMBOL (AcpiEvaluateObject)
635
636
637 /*******************************************************************************
638 *
639 * FUNCTION: AcpiNsResolveReferences
640 *
641 * PARAMETERS: Info - Evaluation info block
642 *
643 * RETURN: Info->ReturnObject is replaced with the dereferenced object
644 *
645 * DESCRIPTION: Dereference certain reference objects. Called before an
646 * internal return object is converted to an external ACPI_OBJECT.
647 *
648 * Performs an automatic dereference of Index and RefOf reference objects.
649 * These reference objects are not supported by the ACPI_OBJECT, so this is a
650 * last resort effort to return something useful. Also, provides compatibility
651 * with other ACPI implementations.
652 *
653 * NOTE: does not handle references within returned package objects or nested
654 * references, but this support could be added later if found to be necessary.
655 *
656 ******************************************************************************/
657
658 static void
659 AcpiNsResolveReferences (
660 ACPI_EVALUATE_INFO *Info)
661 {
662 ACPI_OPERAND_OBJECT *ObjDesc = NULL;
663 ACPI_NAMESPACE_NODE *Node;
664
665
666 /* We are interested in reference objects only */
667
668 if ((Info->ReturnObject)->Common.Type != ACPI_TYPE_LOCAL_REFERENCE)
669 {
670 return;
671 }
672
673 /*
674 * Two types of references are supported - those created by Index and
675 * RefOf operators. A name reference (AML_NAMEPATH_OP) can be converted
676 * to an ACPI_OBJECT, so it is not dereferenced here. A DdbHandle
677 * (AML_LOAD_OP) cannot be dereferenced, nor can it be converted to
678 * an ACPI_OBJECT.
679 */
680 switch (Info->ReturnObject->Reference.Class)
681 {
682 case ACPI_REFCLASS_INDEX:
683
684 ObjDesc = *(Info->ReturnObject->Reference.Where);
685 break;
686
687 case ACPI_REFCLASS_REFOF:
688
689 Node = Info->ReturnObject->Reference.Object;
690 if (Node)
691 {
692 ObjDesc = Node->Object;
693 }
694 break;
695
696 default:
697
698 return;
699 }
700
701 /* Replace the existing reference object */
702
703 if (ObjDesc)
704 {
705 AcpiUtAddReference (ObjDesc);
706 AcpiUtRemoveReference (Info->ReturnObject);
707 Info->ReturnObject = ObjDesc;
708 }
709
710 return;
711 }
712
713
714 /*******************************************************************************
715 *
716 * FUNCTION: AcpiWalkNamespace
717 *
718 * PARAMETERS: Type - ACPI_OBJECT_TYPE to search for
719 * StartObject - Handle in namespace where search begins
720 * MaxDepth - Depth to which search is to reach
721 * DescendingCallback - Called during tree descent
722 * when an object of "Type" is found
723 * AscendingCallback - Called during tree ascent
724 * when an object of "Type" is found
725 * Context - Passed to user function(s) above
726 * ReturnValue - Location where return value of
727 * UserFunction is put if terminated early
728 *
729 * RETURNS Return value from the UserFunction if terminated early.
730 * Otherwise, returns NULL.
731 *
732 * DESCRIPTION: Performs a modified depth-first walk of the namespace tree,
733 * starting (and ending) at the object specified by StartHandle.
734 * The callback function is called whenever an object that matches
735 * the type parameter is found. If the callback function returns
736 * a non-zero value, the search is terminated immediately and this
737 * value is returned to the caller.
738 *
739 * The point of this procedure is to provide a generic namespace
740 * walk routine that can be called from multiple places to
741 * provide multiple services; the callback function(s) can be
742 * tailored to each task, whether it is a print function,
743 * a compare function, etc.
744 *
745 ******************************************************************************/
746
747 ACPI_STATUS
AcpiWalkNamespace(ACPI_OBJECT_TYPE Type,ACPI_HANDLE StartObject,UINT32 MaxDepth,ACPI_WALK_CALLBACK DescendingCallback,ACPI_WALK_CALLBACK AscendingCallback,void * Context,void ** ReturnValue)748 AcpiWalkNamespace (
749 ACPI_OBJECT_TYPE Type,
750 ACPI_HANDLE StartObject,
751 UINT32 MaxDepth,
752 ACPI_WALK_CALLBACK DescendingCallback,
753 ACPI_WALK_CALLBACK AscendingCallback,
754 void *Context,
755 void **ReturnValue)
756 {
757 ACPI_STATUS Status;
758
759
760 ACPI_FUNCTION_TRACE (AcpiWalkNamespace);
761
762
763 /* Parameter validation */
764
765 if ((Type > ACPI_TYPE_LOCAL_MAX) ||
766 (!MaxDepth) ||
767 (!DescendingCallback && !AscendingCallback))
768 {
769 return_ACPI_STATUS (AE_BAD_PARAMETER);
770 }
771
772 /*
773 * Need to acquire the namespace reader lock to prevent interference
774 * with any concurrent table unloads (which causes the deletion of
775 * namespace objects). We cannot allow the deletion of a namespace node
776 * while the user function is using it. The exception to this are the
777 * nodes created and deleted during control method execution -- these
778 * nodes are marked as temporary nodes and are ignored by the namespace
779 * walk. Thus, control methods can be executed while holding the
780 * namespace deletion lock (and the user function can execute control
781 * methods.)
782 */
783 Status = AcpiUtAcquireReadLock (&AcpiGbl_NamespaceRwLock);
784 if (ACPI_FAILURE (Status))
785 {
786 return_ACPI_STATUS (Status);
787 }
788
789 /*
790 * Lock the namespace around the walk. The namespace will be
791 * unlocked/locked around each call to the user function - since the user
792 * function must be allowed to make ACPICA calls itself (for example, it
793 * will typically execute control methods during device enumeration.)
794 */
795 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
796 if (ACPI_FAILURE (Status))
797 {
798 goto UnlockAndExit;
799 }
800
801 /* Now we can validate the starting node */
802
803 if (!AcpiNsValidateHandle (StartObject))
804 {
805 Status = AE_BAD_PARAMETER;
806 goto UnlockAndExit2;
807 }
808
809 Status = AcpiNsWalkNamespace (Type, StartObject, MaxDepth,
810 ACPI_NS_WALK_UNLOCK, DescendingCallback,
811 AscendingCallback, Context, ReturnValue);
812
813 UnlockAndExit2:
814 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
815
816 UnlockAndExit:
817 (void) AcpiUtReleaseReadLock (&AcpiGbl_NamespaceRwLock);
818 return_ACPI_STATUS (Status);
819 }
820
ACPI_EXPORT_SYMBOL(AcpiWalkNamespace)821 ACPI_EXPORT_SYMBOL (AcpiWalkNamespace)
822
823
824 /*******************************************************************************
825 *
826 * FUNCTION: AcpiNsGetDeviceCallback
827 *
828 * PARAMETERS: Callback from AcpiGetDevice
829 *
830 * RETURN: Status
831 *
832 * DESCRIPTION: Takes callbacks from WalkNamespace and filters out all non-
833 * present devices, or if they specified a HID, it filters based
834 * on that.
835 *
836 ******************************************************************************/
837
838 static ACPI_STATUS
839 AcpiNsGetDeviceCallback (
840 ACPI_HANDLE ObjHandle,
841 UINT32 NestingLevel,
842 void *Context,
843 void **ReturnValue)
844 {
845 ACPI_GET_DEVICES_INFO *Info = Context;
846 ACPI_STATUS Status;
847 ACPI_NAMESPACE_NODE *Node;
848 UINT32 Flags;
849 ACPI_PNP_DEVICE_ID *Hid;
850 ACPI_PNP_DEVICE_ID_LIST *Cid;
851 UINT32 i;
852 BOOLEAN Found;
853 int NoMatch;
854
855
856 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
857 if (ACPI_FAILURE (Status))
858 {
859 return (Status);
860 }
861
862 Node = AcpiNsValidateHandle (ObjHandle);
863 Status = AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
864 if (ACPI_FAILURE (Status))
865 {
866 return (Status);
867 }
868
869 if (!Node)
870 {
871 return (AE_BAD_PARAMETER);
872 }
873
874 /*
875 * First, filter based on the device HID and CID.
876 *
877 * 01/2010: For this case where a specific HID is requested, we don't
878 * want to run _STA until we have an actual HID match. Thus, we will
879 * not unnecessarily execute _STA on devices for which the caller
880 * doesn't care about. Previously, _STA was executed unconditionally
881 * on all devices found here.
882 *
883 * A side-effect of this change is that now we will continue to search
884 * for a matching HID even under device trees where the parent device
885 * would have returned a _STA that indicates it is not present or
886 * not functioning (thus aborting the search on that branch).
887 */
888 if (Info->Hid != NULL)
889 {
890 Status = AcpiUtExecute_HID (Node, &Hid);
891 if (Status == AE_NOT_FOUND)
892 {
893 return (AE_OK);
894 }
895 else if (ACPI_FAILURE (Status))
896 {
897 return (AE_CTRL_DEPTH);
898 }
899
900 NoMatch = strcmp (Hid->String, Info->Hid);
901 ACPI_FREE (Hid);
902
903 if (NoMatch)
904 {
905 /*
906 * HID does not match, attempt match within the
907 * list of Compatible IDs (CIDs)
908 */
909 Status = AcpiUtExecute_CID (Node, &Cid);
910 if (Status == AE_NOT_FOUND)
911 {
912 return (AE_OK);
913 }
914 else if (ACPI_FAILURE (Status))
915 {
916 return (AE_CTRL_DEPTH);
917 }
918
919 /* Walk the CID list */
920
921 Found = FALSE;
922 for (i = 0; i < Cid->Count; i++)
923 {
924 if (strcmp (Cid->Ids[i].String, Info->Hid) == 0)
925 {
926 /* Found a matching CID */
927
928 Found = TRUE;
929 break;
930 }
931 }
932
933 ACPI_FREE (Cid);
934 if (!Found)
935 {
936 return (AE_OK);
937 }
938 }
939 }
940
941 /* Run _STA to determine if device is present */
942
943 Status = AcpiUtExecute_STA (Node, &Flags);
944 if (ACPI_FAILURE (Status))
945 {
946 return (AE_CTRL_DEPTH);
947 }
948
949 if (!(Flags & ACPI_STA_DEVICE_PRESENT) &&
950 !(Flags & ACPI_STA_DEVICE_FUNCTIONING))
951 {
952 /*
953 * Don't examine the children of the device only when the
954 * device is neither present nor functional. See ACPI spec,
955 * description of _STA for more information.
956 */
957 return (AE_CTRL_DEPTH);
958 }
959
960 /* We have a valid device, invoke the user function */
961
962 Status = Info->UserFunction (ObjHandle, NestingLevel,
963 Info->Context, ReturnValue);
964 return (Status);
965 }
966
967
968 /*******************************************************************************
969 *
970 * FUNCTION: AcpiGetDevices
971 *
972 * PARAMETERS: HID - HID to search for. Can be NULL.
973 * UserFunction - Called when a matching object is found
974 * Context - Passed to user function
975 * ReturnValue - Location where return value of
976 * UserFunction is put if terminated early
977 *
978 * RETURNS Return value from the UserFunction if terminated early.
979 * Otherwise, returns NULL.
980 *
981 * DESCRIPTION: Performs a modified depth-first walk of the namespace tree,
982 * starting (and ending) at the object specified by StartHandle.
983 * The UserFunction is called whenever an object of type
984 * Device is found. If the user function returns
985 * a non-zero value, the search is terminated immediately and this
986 * value is returned to the caller.
987 *
988 * This is a wrapper for WalkNamespace, but the callback performs
989 * additional filtering. Please see AcpiNsGetDeviceCallback.
990 *
991 ******************************************************************************/
992
993 ACPI_STATUS
AcpiGetDevices(char * HID,ACPI_WALK_CALLBACK UserFunction,void * Context,void ** ReturnValue)994 AcpiGetDevices (
995 char *HID,
996 ACPI_WALK_CALLBACK UserFunction,
997 void *Context,
998 void **ReturnValue)
999 {
1000 ACPI_STATUS Status;
1001 ACPI_GET_DEVICES_INFO Info;
1002
1003
1004 ACPI_FUNCTION_TRACE (AcpiGetDevices);
1005
1006
1007 /* Parameter validation */
1008
1009 if (!UserFunction)
1010 {
1011 return_ACPI_STATUS (AE_BAD_PARAMETER);
1012 }
1013
1014 /*
1015 * We're going to call their callback from OUR callback, so we need
1016 * to know what it is, and their context parameter.
1017 */
1018 Info.Hid = HID;
1019 Info.Context = Context;
1020 Info.UserFunction = UserFunction;
1021
1022 /*
1023 * Lock the namespace around the walk.
1024 * The namespace will be unlocked/locked around each call
1025 * to the user function - since this function
1026 * must be allowed to make Acpi calls itself.
1027 */
1028 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
1029 if (ACPI_FAILURE (Status))
1030 {
1031 return_ACPI_STATUS (Status);
1032 }
1033
1034 Status = AcpiNsWalkNamespace (ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
1035 ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK,
1036 AcpiNsGetDeviceCallback, NULL, &Info, ReturnValue);
1037
1038 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
1039 return_ACPI_STATUS (Status);
1040 }
1041
ACPI_EXPORT_SYMBOL(AcpiGetDevices)1042 ACPI_EXPORT_SYMBOL (AcpiGetDevices)
1043
1044
1045 /*******************************************************************************
1046 *
1047 * FUNCTION: AcpiAttachData
1048 *
1049 * PARAMETERS: ObjHandle - Namespace node
1050 * Handler - Handler for this attachment
1051 * Data - Pointer to data to be attached
1052 *
1053 * RETURN: Status
1054 *
1055 * DESCRIPTION: Attach arbitrary data and handler to a namespace node.
1056 *
1057 ******************************************************************************/
1058
1059 ACPI_STATUS
1060 AcpiAttachData (
1061 ACPI_HANDLE ObjHandle,
1062 ACPI_OBJECT_HANDLER Handler,
1063 void *Data)
1064 {
1065 ACPI_NAMESPACE_NODE *Node;
1066 ACPI_STATUS Status;
1067
1068
1069 /* Parameter validation */
1070
1071 if (!ObjHandle ||
1072 !Handler ||
1073 !Data)
1074 {
1075 return (AE_BAD_PARAMETER);
1076 }
1077
1078 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
1079 if (ACPI_FAILURE (Status))
1080 {
1081 return (Status);
1082 }
1083
1084 /* Convert and validate the handle */
1085
1086 Node = AcpiNsValidateHandle (ObjHandle);
1087 if (!Node)
1088 {
1089 Status = AE_BAD_PARAMETER;
1090 goto UnlockAndExit;
1091 }
1092
1093 Status = AcpiNsAttachData (Node, Handler, Data);
1094
1095 UnlockAndExit:
1096 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
1097 return (Status);
1098 }
1099
ACPI_EXPORT_SYMBOL(AcpiAttachData)1100 ACPI_EXPORT_SYMBOL (AcpiAttachData)
1101
1102
1103 /*******************************************************************************
1104 *
1105 * FUNCTION: AcpiDetachData
1106 *
1107 * PARAMETERS: ObjHandle - Namespace node handle
1108 * Handler - Handler used in call to AcpiAttachData
1109 *
1110 * RETURN: Status
1111 *
1112 * DESCRIPTION: Remove data that was previously attached to a node.
1113 *
1114 ******************************************************************************/
1115
1116 ACPI_STATUS
1117 AcpiDetachData (
1118 ACPI_HANDLE ObjHandle,
1119 ACPI_OBJECT_HANDLER Handler)
1120 {
1121 ACPI_NAMESPACE_NODE *Node;
1122 ACPI_STATUS Status;
1123
1124
1125 /* Parameter validation */
1126
1127 if (!ObjHandle ||
1128 !Handler)
1129 {
1130 return (AE_BAD_PARAMETER);
1131 }
1132
1133 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
1134 if (ACPI_FAILURE (Status))
1135 {
1136 return (Status);
1137 }
1138
1139 /* Convert and validate the handle */
1140
1141 Node = AcpiNsValidateHandle (ObjHandle);
1142 if (!Node)
1143 {
1144 Status = AE_BAD_PARAMETER;
1145 goto UnlockAndExit;
1146 }
1147
1148 Status = AcpiNsDetachData (Node, Handler);
1149
1150 UnlockAndExit:
1151 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
1152 return (Status);
1153 }
1154
ACPI_EXPORT_SYMBOL(AcpiDetachData)1155 ACPI_EXPORT_SYMBOL (AcpiDetachData)
1156
1157
1158 /*******************************************************************************
1159 *
1160 * FUNCTION: AcpiGetData
1161 *
1162 * PARAMETERS: ObjHandle - Namespace node
1163 * Handler - Handler used in call to AttachData
1164 * Data - Where the data is returned
1165 *
1166 * RETURN: Status
1167 *
1168 * DESCRIPTION: Retrieve data that was previously attached to a namespace node.
1169 *
1170 ******************************************************************************/
1171
1172 ACPI_STATUS
1173 AcpiGetData (
1174 ACPI_HANDLE ObjHandle,
1175 ACPI_OBJECT_HANDLER Handler,
1176 void **Data)
1177 {
1178 ACPI_NAMESPACE_NODE *Node;
1179 ACPI_STATUS Status;
1180
1181
1182 /* Parameter validation */
1183
1184 if (!ObjHandle ||
1185 !Handler ||
1186 !Data)
1187 {
1188 return (AE_BAD_PARAMETER);
1189 }
1190
1191 Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE);
1192 if (ACPI_FAILURE (Status))
1193 {
1194 return (Status);
1195 }
1196
1197 /* Convert and validate the handle */
1198
1199 Node = AcpiNsValidateHandle (ObjHandle);
1200 if (!Node)
1201 {
1202 Status = AE_BAD_PARAMETER;
1203 goto UnlockAndExit;
1204 }
1205
1206 Status = AcpiNsGetAttachedData (Node, Handler, Data);
1207
1208 UnlockAndExit:
1209 (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE);
1210 return (Status);
1211 }
1212
1213 ACPI_EXPORT_SYMBOL (AcpiGetData)
1214