drivers/bus/acpi/acpica/namespace/nseval.c

   1 /*******************************************************************************
   2  *
   3  * Module Name: nseval - Object evaluation, includes control method execution
   4  *
   5  ******************************************************************************/
   6
   7 /*
   8  * Copyright (C) 2000 - 2018, 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.h"
  45 #include "accommon.h"
  46 #include "acparser.h"
  47 #include "acinterp.h"
  48 #include "acnamesp.h"
  49
  50
  51 #define _COMPONENT          ACPI_NAMESPACE
  52         ACPI_MODULE_NAME    ("nseval")
  53
  54 /* Local prototypes */
  55
  56 static void
  57 AcpiNsExecModuleCode (
  58     ACPI_OPERAND_OBJECT     *MethodObj,
  59     ACPI_EVALUATE_INFO      *Info);
  60
  61
  62 /*******************************************************************************
  63  *
  64  * FUNCTION:    AcpiNsEvaluate
  65  *
  66  * PARAMETERS:  Info            - Evaluation info block, contains these fields
  67  *                                and more:
  68  *                  PrefixNode      - Prefix or Method/Object Node to execute
  69  *                  RelativePath    - Name of method to execute, If NULL, the
  70  *                                    Node is the object to execute
  71  *                  Parameters      - List of parameters to pass to the method,
  72  *                                    terminated by NULL. Params itself may be
  73  *                                    NULL if no parameters are being passed.
  74  *                  ParameterType   - Type of Parameter list
  75  *                  ReturnObject    - Where to put method's return value (if
  76  *                                    any). If NULL, no value is returned.
  77  *                  Flags           - ACPI_IGNORE_RETURN_VALUE to delete return
  78  *
  79  * RETURN:      Status
  80  *
  81  * DESCRIPTION: Execute a control method or return the current value of an
  82  *              ACPI namespace object.
  83  *
  84  * MUTEX:       Locks interpreter
  85  *
  86  ******************************************************************************/
  87
  88 ACPI_STATUS
  89 AcpiNsEvaluate (
  90     ACPI_EVALUATE_INFO      *Info)
  91 {
  92     ACPI_STATUS             Status;
  93
  94
  95     ACPI_FUNCTION_TRACE (NsEvaluate);
  96
  97
  98     if (!Info)
  99     {
 100         return_ACPI_STATUS (AE_BAD_PARAMETER);
 101     }
 102
 103     if (!Info->Node)
 104     {
 105         /*
 106          * Get the actual namespace node for the target object if we
 107          * need to. Handles these cases:
 108          *
 109          * 1) Null node, valid pathname from root (absolute path)
 110          * 2) Node and valid pathname (path relative to Node)
 111          * 3) Node, Null pathname
 112          */
 113         Status = AcpiNsGetNode (Info->PrefixNode, Info->RelativePathname,
 114             ACPI_NS_NO_UPSEARCH, &Info->Node);
 115         if (ACPI_FAILURE (Status))
 116         {
 117             return_ACPI_STATUS (Status);
 118         }
 119     }
 120
 121     /*
 122      * For a method alias, we must grab the actual method node so that
 123      * proper scoping context will be established before execution.
 124      */
 125     if (AcpiNsGetType (Info->Node) == ACPI_TYPE_LOCAL_METHOD_ALIAS)
 126     {
 127         Info->Node = ACPI_CAST_PTR (
 128             ACPI_NAMESPACE_NODE, Info->Node->Object);
 129     }
 130
 131     /* Complete the info block initialization */
 132
 133     Info->ReturnObject = NULL;
 134     Info->NodeFlags = Info->Node->Flags;
 135     Info->ObjDesc = AcpiNsGetAttachedObject (Info->Node);
 136
 137     ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "%s [%p] Value %p\n",
 138         Info->RelativePathname, Info->Node,
 139         AcpiNsGetAttachedObject (Info->Node)));
 140
 141     /* Get info if we have a predefined name (_HID, etc.) */
 142
 143     Info->Predefined = AcpiUtMatchPredefinedMethod (Info->Node->Name.Ascii);
 144
 145     /* Get the full pathname to the object, for use in warning messages */
 146
 147     Info->FullPathname = AcpiNsGetNormalizedPathname (Info->Node, TRUE);
 148     if (!Info->FullPathname)
 149     {
 150         return_ACPI_STATUS (AE_NO_MEMORY);
 151     }
 152
 153     /* Count the number of arguments being passed in */
 154
 155     Info->ParamCount = 0;
 156     if (Info->Parameters)
 157     {
 158         while (Info->Parameters[Info->ParamCount])
 159         {
 160             Info->ParamCount++;
 161         }
 162
 163         /* Warn on impossible argument count */
 164
 165         if (Info->ParamCount > ACPI_METHOD_NUM_ARGS)
 166         {
 167             ACPI_WARN_PREDEFINED ((AE_INFO, Info->FullPathname, ACPI_WARN_ALWAYS,
 168                 "Excess arguments (%u) - using only %u",
 169                 Info->ParamCount, ACPI_METHOD_NUM_ARGS));
 170
 171             Info->ParamCount = ACPI_METHOD_NUM_ARGS;
 172         }
 173     }
 174
 175     /*
 176      * For predefined names: Check that the declared argument count
 177      * matches the ACPI spec -- otherwise this is a BIOS error.
 178      */
 179     AcpiNsCheckAcpiCompliance (Info->FullPathname, Info->Node,
 180         Info->Predefined);
 181
 182     /*
 183      * For all names: Check that the incoming argument count for
 184      * this method/object matches the actual ASL/AML definition.
 185      */
 186     AcpiNsCheckArgumentCount (Info->FullPathname, Info->Node,
 187         Info->ParamCount, Info->Predefined);
 188
 189     /* For predefined names: Typecheck all incoming arguments */
 190
 191     AcpiNsCheckArgumentTypes (Info);
 192
 193     /*
 194      * Three major evaluation cases:
 195      *
 196      * 1) Object types that cannot be evaluated by definition
 197      * 2) The object is a control method -- execute it
 198      * 3) The object is not a method -- just return it's current value
 199      */
 200     switch (AcpiNsGetType (Info->Node))
 201     {
 202     case ACPI_TYPE_ANY:
 203     case ACPI_TYPE_DEVICE:
 204     case ACPI_TYPE_EVENT:
 205     case ACPI_TYPE_MUTEX:
 206     case ACPI_TYPE_REGION:
 207     case ACPI_TYPE_THERMAL:
 208     case ACPI_TYPE_LOCAL_SCOPE:
 209         /*
 210          * 1) Disallow evaluation of these object types. For these,
 211          *    object evaluation is undefined.
 212          */
 213         ACPI_ERROR ((AE_INFO,
 214             "%s: This object type [%s] "
 215             "never contains data and cannot be evaluated",
 216             Info->FullPathname, AcpiUtGetTypeName (Info->Node->Type)));
 217
 218         Status = AE_TYPE;
 219         goto Cleanup;
 220
 221     case ACPI_TYPE_METHOD:
 222         /*
 223          * 2) Object is a control method - execute it
 224          */
 225
 226         /* Verify that there is a method object associated with this node */
 227
 228         if (!Info->ObjDesc)
 229         {
 230             ACPI_ERROR ((AE_INFO, "%s: Method has no attached sub-object",
 231                 Info->FullPathname));
 232             Status = AE_NULL_OBJECT;
 233             goto Cleanup;
 234         }
 235
 236         ACPI_DEBUG_PRINT ((ACPI_DB_EXEC,
 237             "**** Execute method [%s] at AML address %p length %X\n",
 238             Info->FullPathname,
 239             Info->ObjDesc->Method.AmlStart + 1,
 240             Info->ObjDesc->Method.AmlLength - 1));
 241
 242         /*
 243          * Any namespace deletion must acquire both the namespace and
 244          * interpreter locks to ensure that no thread is using the portion of
 245          * the namespace that is being deleted.
 246          *
 247          * Execute the method via the interpreter. The interpreter is locked
 248          * here before calling into the AML parser
 249          */
 250         AcpiExEnterInterpreter ();
 251         Status = AcpiPsExecuteMethod (Info);
 252         AcpiExExitInterpreter ();
 253         break;
 254
 255     default:
 256         /*
 257          * 3) All other non-method objects -- get the current object value
 258          */
 259
 260         /*
 261          * Some objects require additional resolution steps (e.g., the Node
 262          * may be a field that must be read, etc.) -- we can't just grab
 263          * the object out of the node.
 264          *
 265          * Use ResolveNodeToValue() to get the associated value.
 266          *
 267          * NOTE: we can get away with passing in NULL for a walk state because
 268          * the Node is guaranteed to not be a reference to either a method
 269          * local or a method argument (because this interface is never called
 270          * from a running method.)
 271          *
 272          * Even though we do not directly invoke the interpreter for object
 273          * resolution, we must lock it because we could access an OpRegion.
 274          * The OpRegion access code assumes that the interpreter is locked.
 275          */
 276         AcpiExEnterInterpreter ();
 277
 278         /* TBD: ResolveNodeToValue has a strange interface, fix */
 279
 280         Info->ReturnObject = ACPI_CAST_PTR (ACPI_OPERAND_OBJECT, Info->Node);
 281
 282         Status = AcpiExResolveNodeToValue (ACPI_CAST_INDIRECT_PTR (
 283             ACPI_NAMESPACE_NODE, &Info->ReturnObject), NULL);
 284         AcpiExExitInterpreter ();
 285
 286         if (ACPI_FAILURE (Status))
 287         {
 288             Info->ReturnObject = NULL;
 289             goto Cleanup;
 290         }
 291
 292         ACPI_DEBUG_PRINT ((ACPI_DB_NAMES, "Returned object %p [%s]\n",
 293             Info->ReturnObject,
 294             AcpiUtGetObjectTypeName (Info->ReturnObject)));
 295
 296         Status = AE_CTRL_RETURN_VALUE; /* Always has a "return value" */
 297         break;
 298     }
 299
 300     /*
 301      * For predefined names, check the return value against the ACPI
 302      * specification. Some incorrect return value types are repaired.
 303      */
 304     (void) AcpiNsCheckReturnValue (Info->Node, Info, Info->ParamCount,
 305         Status, &Info->ReturnObject);
 306
 307     /* Check if there is a return value that must be dealt with */
 308
 309     if (Status == AE_CTRL_RETURN_VALUE)
 310     {
 311         /* If caller does not want the return value, delete it */
 312
 313         if (Info->Flags & ACPI_IGNORE_RETURN_VALUE)
 314         {
 315             AcpiUtRemoveReference (Info->ReturnObject);
 316             Info->ReturnObject = NULL;
 317         }
 318
 319         /* Map AE_CTRL_RETURN_VALUE to AE_OK, we are done with it */
 320
 321         Status = AE_OK;
 322     }
 323     else if (ACPI_FAILURE(Status))
 324     {
 325         /* If ReturnObject exists, delete it */
 326
 327         if (Info->ReturnObject)
 328         {
 329             AcpiUtRemoveReference (Info->ReturnObject);
 330             Info->ReturnObject = NULL;
 331         }
 332     }
 333
 334     ACPI_DEBUG_PRINT ((ACPI_DB_NAMES,
 335         "*** Completed evaluation of object %s ***\n",
 336         Info->RelativePathname));
 337
 338 Cleanup:
 339     /*
 340      * Namespace was unlocked by the handling AcpiNs* function, so we
 341      * just free the pathname and return
 342      */
 343     ACPI_FREE (Info->FullPathname);
 344     Info->FullPathname = NULL;
 345     return_ACPI_STATUS (Status);
 346 }
 347
 348
 349 /*******************************************************************************
 350  *
 351  * FUNCTION:    AcpiNsExecModuleCodeList
 352  *
 353  * PARAMETERS:  None
 354  *
 355  * RETURN:      None. Exceptions during method execution are ignored, since
 356  *              we cannot abort a table load.
 357  *
 358  * DESCRIPTION: Execute all elements of the global module-level code list.
 359  *              Each element is executed as a single control method.
 360  *
 361  * NOTE: With this option enabled, each block of detected executable AML
 362  * code that is outside of any control method is wrapped with a temporary
 363  * control method object and placed on a global list. The methods on this
 364  * list are executed below.
 365  *
 366  * This function executes the module-level code for all tables only after
 367  * all of the tables have been loaded. It is a legacy option and is
 368  * not compatible with other ACPI implementations. See AcpiNsLoadTable.
 369  *
 370  * This function will be removed when the legacy option is removed.
 371  *
 372  ******************************************************************************/
 373
 374 void
 375 AcpiNsExecModuleCodeList (
 376     void)
 377 {
 378     ACPI_OPERAND_OBJECT     *Prev;
 379     ACPI_OPERAND_OBJECT     *Next;
 380     ACPI_EVALUATE_INFO      *Info;
 381     UINT32                  MethodCount = 0;
 382
 383
 384     ACPI_FUNCTION_TRACE (NsExecModuleCodeList);
 385
 386
 387     /* Exit now if the list is empty */
 388
 389     Next = AcpiGbl_ModuleCodeList;
 390     if (!Next)
 391     {
 392         ACPI_DEBUG_PRINT ((ACPI_DB_INIT_NAMES,
 393             "Legacy MLC block list is empty\n"));
 394
 395         return_VOID;
 396     }
 397
 398     /* Allocate the evaluation information block */
 399
 400     Info = ACPI_ALLOCATE (sizeof (ACPI_EVALUATE_INFO));
 401     if (!Info)
 402     {
 403         return_VOID;
 404     }
 405
 406     /* Walk the list, executing each "method" */
 407
 408     while (Next)
 409     {
 410         Prev = Next;
 411         Next = Next->Method.Mutex;
 412
 413         /* Clear the link field and execute the method */
 414
 415         Prev->Method.Mutex = NULL;
 416         AcpiNsExecModuleCode (Prev, Info);
 417         MethodCount++;
 418
 419         /* Delete the (temporary) method object */
 420
 421         AcpiUtRemoveReference (Prev);
 422     }
 423
 424     ACPI_INFO ((
 425         "Executed %u blocks of module-level executable AML code",
 426         MethodCount));
 427
 428     ACPI_FREE (Info);
 429     AcpiGbl_ModuleCodeList = NULL;
 430     return_VOID;
 431 }
 432
 433
 434 /*******************************************************************************
 435  *
 436  * FUNCTION:    AcpiNsExecModuleCode
 437  *
 438  * PARAMETERS:  MethodObj           - Object container for the module-level code
 439  *              Info                - Info block for method evaluation
 440  *
 441  * RETURN:      None. Exceptions during method execution are ignored, since
 442  *              we cannot abort a table load.
 443  *
 444  * DESCRIPTION: Execute a control method containing a block of module-level
 445  *              executable AML code. The control method is temporarily
 446  *              installed to the root node, then evaluated.
 447  *
 448  ******************************************************************************/
 449
 450 static void
 451 AcpiNsExecModuleCode (
 452     ACPI_OPERAND_OBJECT     *MethodObj,
 453     ACPI_EVALUATE_INFO      *Info)
 454 {
 455     ACPI_OPERAND_OBJECT     *ParentObj;
 456     ACPI_NAMESPACE_NODE     *ParentNode;
 457     ACPI_OBJECT_TYPE        Type;
 458     ACPI_STATUS             Status;
 459
 460
 461     ACPI_FUNCTION_TRACE (NsExecModuleCode);
 462
 463
 464     /*
 465      * Get the parent node. We cheat by using the NextObject field
 466      * of the method object descriptor.
 467      */
 468     ParentNode = ACPI_CAST_PTR (
 469         ACPI_NAMESPACE_NODE, MethodObj->Method.NextObject);
 470     Type = AcpiNsGetType (ParentNode);
 471
 472     /*
 473      * Get the region handler and save it in the method object. We may need
 474      * this if an operation region declaration causes a _REG method to be run.
 475      *
 476      * We can't do this in AcpiPsLinkModuleCode because
 477      * AcpiGbl_RootNode->Object is NULL at PASS1.
 478      */
 479     if ((Type == ACPI_TYPE_DEVICE) && ParentNode->Object)
 480     {
 481         MethodObj->Method.Dispatch.Handler =
 482             ParentNode->Object->Device.Handler;
 483     }
 484
 485     /* Must clear NextObject (AcpiNsAttachObject needs the field) */
 486
 487     MethodObj->Method.NextObject = NULL;
 488
 489     /* Initialize the evaluation information block */
 490
 491     memset (Info, 0, sizeof (ACPI_EVALUATE_INFO));
 492     Info->PrefixNode = ParentNode;
 493
 494     /*
 495      * Get the currently attached parent object. Add a reference,
 496      * because the ref count will be decreased when the method object
 497      * is installed to the parent node.
 498      */
 499     ParentObj = AcpiNsGetAttachedObject (ParentNode);
 500     if (ParentObj)
 501     {
 502         AcpiUtAddReference (ParentObj);
 503     }
 504
 505     /* Install the method (module-level code) in the parent node */
 506
 507     Status = AcpiNsAttachObject (ParentNode, MethodObj, ACPI_TYPE_METHOD);
 508     if (ACPI_FAILURE (Status))
 509     {
 510         goto Exit;
 511     }
 512
 513     /* Execute the parent node as a control method */
 514
 515     Status = AcpiNsEvaluate (Info);
 516
 517     ACPI_DEBUG_PRINT ((ACPI_DB_INIT_NAMES,
 518         "Executed module-level code at %p\n",
 519         MethodObj->Method.AmlStart));
 520
 521     /* Delete a possible implicit return value (in slack mode) */
 522
 523     if (Info->ReturnObject)
 524     {
 525         AcpiUtRemoveReference (Info->ReturnObject);
 526     }
 527
 528     /* Detach the temporary method object */
 529
 530     AcpiNsDetachObject (ParentNode);
 531
 532     /* Restore the original parent object */
 533
 534     if (ParentObj)
 535     {
 536         Status = AcpiNsAttachObject (ParentNode, ParentObj, Type);
 537     }
 538     else
 539     {
 540         ParentNode->Type = (UINT8) Type;
 541     }
 542
 543 Exit:
 544     if (ParentObj)
 545     {
 546         AcpiUtRemoveReference (ParentObj);
 547     }
 548     return_VOID;
 549 }