/****************************************************************************** * * Module Name: evregion - Operation Region support * *****************************************************************************/ /****************************************************************************** * * 1. Copyright Notice * * Some or all of this work - Copyright (c) 1999 - 2021, Intel Corp. * All rights reserved. * * 2. License * * 2.1. This is your license from Intel Corp. under its intellectual property * rights. You may have additional license terms from the party that provided * you this software, covering your right to use that party's intellectual * property rights. * * 2.2. Intel grants, free of charge, to any person ("Licensee") obtaining a * copy of the source code appearing in this file ("Covered Code") an * irrevocable, perpetual, worldwide license under Intel's copyrights in the * base code distributed originally by Intel ("Original Intel Code") to copy, * make derivatives, distribute, use and display any portion of the Covered * Code in any form, with the right to sublicense such rights; and * * 2.3. Intel grants Licensee a non-exclusive and non-transferable patent * license (with the right to sublicense), under only those claims of Intel * patents that are infringed by the Original Intel Code, to make, use, sell, * offer to sell, and import the Covered Code and derivative works thereof * solely to the minimum extent necessary to exercise the above copyright * license, and in no event shall the patent license extend to any additions * to or modifications of the Original Intel Code. No other license or right * is granted directly or by implication, estoppel or otherwise; * * The above copyright and patent license is granted only if the following * conditions are met: * * 3. Conditions * * 3.1. Redistribution of Source with Rights to Further Distribute Source. * Redistribution of source code of any substantial portion of the Covered * Code or modification with rights to further distribute source must include * the above Copyright Notice, the above License, this list of Conditions, * and the following Disclaimer and Export Compliance provision. In addition, * Licensee must cause all Covered Code to which Licensee contributes to * contain a file documenting the changes Licensee made to create that Covered * Code and the date of any change. Licensee must include in that file the * documentation of any changes made by any predecessor Licensee. Licensee * must include a prominent statement that the modification is derived, * directly or indirectly, from Original Intel Code. * * 3.2. Redistribution of Source with no Rights to Further Distribute Source. * Redistribution of source code of any substantial portion of the Covered * Code or modification without rights to further distribute source must * include the following Disclaimer and Export Compliance provision in the * documentation and/or other materials provided with distribution. In * addition, Licensee may not authorize further sublicense of source of any * portion of the Covered Code, and must include terms to the effect that the * license from Licensee to its licensee is limited to the intellectual * property embodied in the software Licensee provides to its licensee, and * not to intellectual property embodied in modifications its licensee may * make. * * 3.3. Redistribution of Executable. Redistribution in executable form of any * substantial portion of the Covered Code or modification must reproduce the * above Copyright Notice, and the following Disclaimer and Export Compliance * provision in the documentation and/or other materials provided with the * distribution. * * 3.4. Intel retains all right, title, and interest in and to the Original * Intel Code. * * 3.5. Neither the name Intel nor any other trademark owned or controlled by * Intel shall be used in advertising or otherwise to promote the sale, use or * other dealings in products derived from or relating to the Covered Code * without prior written authorization from Intel. * * 4. Disclaimer and Export Compliance * * 4.1. INTEL MAKES NO WARRANTY OF ANY KIND REGARDING ANY SOFTWARE PROVIDED * HERE. ANY SOFTWARE ORIGINATING FROM INTEL OR DERIVED FROM INTEL SOFTWARE * IS PROVIDED "AS IS," AND INTEL WILL NOT PROVIDE ANY SUPPORT, ASSISTANCE, * INSTALLATION, TRAINING OR OTHER SERVICES. INTEL WILL NOT PROVIDE ANY * UPDATES, ENHANCEMENTS OR EXTENSIONS. INTEL SPECIFICALLY DISCLAIMS ANY * IMPLIED WARRANTIES OF MERCHANTABILITY, NONINFRINGEMENT AND FITNESS FOR A * PARTICULAR PURPOSE. * * 4.2. IN NO EVENT SHALL INTEL HAVE ANY LIABILITY TO LICENSEE, ITS LICENSEES * OR ANY OTHER THIRD PARTY, FOR ANY LOST PROFITS, LOST DATA, LOSS OF USE OR * COSTS OF PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES, OR FOR ANY INDIRECT, * SPECIAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THIS AGREEMENT, UNDER ANY * CAUSE OF ACTION OR THEORY OF LIABILITY, AND IRRESPECTIVE OF WHETHER INTEL * HAS ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES. THESE LIMITATIONS * SHALL APPLY NOTWITHSTANDING THE FAILURE OF THE ESSENTIAL PURPOSE OF ANY * LIMITED REMEDY. * * 4.3. Licensee shall not export, either directly or indirectly, any of this * software or system incorporating such software without first obtaining any * required license or other approval from the U. S. Department of Commerce or * any other agency or department of the United States Government. In the * event Licensee exports any such software from the United States or * re-exports any such software from a foreign destination, Licensee shall * ensure that the distribution and export/re-export of the software is in * compliance with all laws, regulations, orders, or other restrictions of the * U.S. Export Administration Regulations. Licensee agrees that neither it nor * any of its subsidiaries will export/re-export any technical data, process, * software, or service, directly or indirectly, to any country for which the * United States government or any agency thereof requires an export license, * other governmental approval, or letter of assurance, without first obtaining * such license, approval or letter. * ***************************************************************************** * * Alternatively, you may choose to be licensed under the terms of the * following license: * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions, and the following disclaimer, * without modification. * 2. Redistributions in binary form must reproduce at minimum a disclaimer * substantially similar to the "NO WARRANTY" disclaimer below * ("Disclaimer") and any redistribution must be conditioned upon * including a substantially similar Disclaimer requirement for further * binary redistribution. * 3. Neither the names of the above-listed copyright holders nor the names * of any contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * Alternatively, you may choose to be licensed under the terms of the * GNU General Public License ("GPL") version 2 as published by the Free * Software Foundation. * *****************************************************************************/ #include "acpi.h" #include "accommon.h" #include "acevents.h" #include "acnamesp.h" #include "acinterp.h" #define _COMPONENT ACPI_EVENTS ACPI_MODULE_NAME ("evregion") extern UINT8 AcpiGbl_DefaultAddressSpaces[]; /* Local prototypes */ static void AcpiEvExecuteOrphanRegMethod ( ACPI_NAMESPACE_NODE *DeviceNode, ACPI_ADR_SPACE_TYPE SpaceId); static ACPI_STATUS AcpiEvRegRun ( ACPI_HANDLE ObjHandle, UINT32 Level, void *Context, void **ReturnValue); /******************************************************************************* * * FUNCTION: AcpiEvInitializeOpRegions * * PARAMETERS: None * * RETURN: Status * * DESCRIPTION: Execute _REG methods for all Operation Regions that have * an installed default region handler. * ******************************************************************************/ ACPI_STATUS AcpiEvInitializeOpRegions ( void) { ACPI_STATUS Status; UINT32 i; ACPI_FUNCTION_TRACE (EvInitializeOpRegions); Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); if (ACPI_FAILURE (Status)) { return_ACPI_STATUS (Status); } /* Run the _REG methods for OpRegions in each default address space */ for (i = 0; i < ACPI_NUM_DEFAULT_SPACES; i++) { /* * Make sure the installed handler is the DEFAULT handler. If not the * default, the _REG methods will have already been run (when the * handler was installed) */ if (AcpiEvHasDefaultHandler (AcpiGbl_RootNode, AcpiGbl_DefaultAddressSpaces[i])) { AcpiEvExecuteRegMethods (AcpiGbl_RootNode, AcpiGbl_DefaultAddressSpaces[i], ACPI_REG_CONNECT); } } (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); return_ACPI_STATUS (Status); } /******************************************************************************* * * FUNCTION: AcpiEvAddressSpaceDispatch * * PARAMETERS: RegionObj - Internal region object * FieldObj - Corresponding field. Can be NULL. * Function - Read or Write operation * RegionOffset - Where in the region to read or write * BitWidth - Field width in bits (8, 16, 32, or 64) * Value - Pointer to in or out value, must be * a full 64-bit integer * * RETURN: Status * * DESCRIPTION: Dispatch an address space or operation region access to * a previously installed handler. * * NOTE: During early initialization, we always install the default region * handlers for Memory, I/O and PCI_Config. This ensures that these operation * region address spaces are always available as per the ACPI specification. * This is especially needed in order to support the execution of * module-level AML code during loading of the ACPI tables. * ******************************************************************************/ ACPI_STATUS AcpiEvAddressSpaceDispatch ( ACPI_OPERAND_OBJECT *RegionObj, ACPI_OPERAND_OBJECT *FieldObj, UINT32 Function, UINT32 RegionOffset, UINT32 BitWidth, UINT64 *Value) { ACPI_STATUS Status; ACPI_ADR_SPACE_HANDLER Handler; ACPI_ADR_SPACE_SETUP RegionSetup; ACPI_OPERAND_OBJECT *HandlerDesc; ACPI_OPERAND_OBJECT *RegionObj2; void *RegionContext = NULL; ACPI_CONNECTION_INFO *Context; ACPI_MUTEX ContextMutex; BOOLEAN ContextLocked; ACPI_PHYSICAL_ADDRESS Address; ACPI_FUNCTION_TRACE (EvAddressSpaceDispatch); RegionObj2 = AcpiNsGetSecondaryObject (RegionObj); if (!RegionObj2) { return_ACPI_STATUS (AE_NOT_EXIST); } /* Ensure that there is a handler associated with this region */ HandlerDesc = RegionObj->Region.Handler; if (!HandlerDesc) { ACPI_ERROR ((AE_INFO, "No handler for Region [%4.4s] (%p) [%s]", AcpiUtGetNodeName (RegionObj->Region.Node), RegionObj, AcpiUtGetRegionName (RegionObj->Region.SpaceId))); return_ACPI_STATUS (AE_NOT_EXIST); } Context = HandlerDesc->AddressSpace.Context; ContextMutex = HandlerDesc->AddressSpace.ContextMutex; ContextLocked = FALSE; /* * It may be the case that the region has never been initialized. * Some types of regions require special init code */ if (!(RegionObj->Region.Flags & AOPOBJ_SETUP_COMPLETE)) { /* This region has not been initialized yet, do it */ RegionSetup = HandlerDesc->AddressSpace.Setup; if (!RegionSetup) { /* No initialization routine, exit with error */ ACPI_ERROR ((AE_INFO, "No init routine for region(%p) [%s]", RegionObj, AcpiUtGetRegionName (RegionObj->Region.SpaceId))); return_ACPI_STATUS (AE_NOT_EXIST); } if (RegionObj->Region.SpaceId == ACPI_ADR_SPACE_PLATFORM_COMM) { ACPI_PCC_INFO *Ctx = HandlerDesc->AddressSpace.Context; Ctx->InternalBuffer = FieldObj->Field.InternalPccBuffer; Ctx->Length = (UINT16) RegionObj->Region.Length; Ctx->SubspaceId = (UINT8) RegionObj->Region.Address; } /* * We must exit the interpreter because the region setup will * potentially execute control methods (for example, the _REG method * for this region) */ AcpiExExitInterpreter (); Status = RegionSetup (RegionObj, ACPI_REGION_ACTIVATE, Context, &RegionContext); /* Re-enter the interpreter */ AcpiExEnterInterpreter (); /* Check for failure of the Region Setup */ if (ACPI_FAILURE (Status)) { ACPI_EXCEPTION ((AE_INFO, Status, "During region initialization: [%s]", AcpiUtGetRegionName (RegionObj->Region.SpaceId))); return_ACPI_STATUS (Status); } /* Region initialization may have been completed by RegionSetup */ if (!(RegionObj->Region.Flags & AOPOBJ_SETUP_COMPLETE)) { RegionObj->Region.Flags |= AOPOBJ_SETUP_COMPLETE; /* * Save the returned context for use in all accesses to * the handler for this particular region */ if (!(RegionObj2->Extra.RegionContext)) { RegionObj2->Extra.RegionContext = RegionContext; } } } /* We have everything we need, we can invoke the address space handler */ Handler = HandlerDesc->AddressSpace.Handler; Address = (RegionObj->Region.Address + RegionOffset); ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION, "Handler %p (@%p) Address %8.8X%8.8X [%s]\n", &RegionObj->Region.Handler->AddressSpace, Handler, ACPI_FORMAT_UINT64 (Address), AcpiUtGetRegionName (RegionObj->Region.SpaceId))); if (!(HandlerDesc->AddressSpace.HandlerFlags & ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)) { /* * For handlers other than the default (supplied) handlers, we must * exit the interpreter because the handler *might* block -- we don't * know what it will do, so we can't hold the lock on the interpreter. */ AcpiExExitInterpreter(); } /* * Special handling for GenericSerialBus and GeneralPurposeIo: * There are three extra parameters that must be passed to the * handler via the context: * 1) Connection buffer, a resource template from Connection() op * 2) Length of the above buffer * 3) Actual access length from the AccessAs() op * * Since we pass these extra parameters via the context, which is * shared between threads, we must lock the context to avoid these * parameters being changed from another thread before the handler * has completed running. * * In addition, for GeneralPurposeIo, the Address and BitWidth fields * are defined as follows: * 1) Address is the pin number index of the field (bit offset from * the previous Connection) * 2) BitWidth is the actual bit length of the field (number of pins) */ if ((RegionObj->Region.SpaceId == ACPI_ADR_SPACE_GSBUS || RegionObj->Region.SpaceId == ACPI_ADR_SPACE_GPIO) && Context && FieldObj) { Status = AcpiOsAcquireMutex (ContextMutex, ACPI_WAIT_FOREVER); if (ACPI_FAILURE (Status)) { goto ReEnterInterpreter; } ContextLocked = TRUE; /* Get the Connection (ResourceTemplate) buffer */ Context->Connection = FieldObj->Field.ResourceBuffer; Context->Length = FieldObj->Field.ResourceLength; Context->AccessLength = FieldObj->Field.AccessLength; if (RegionObj->Region.SpaceId == ACPI_ADR_SPACE_GPIO) { Address = FieldObj->Field.PinNumberIndex; BitWidth = FieldObj->Field.BitLength; } } /* Call the handler */ Status = Handler (Function, Address, BitWidth, Value, Context, RegionObj2->Extra.RegionContext); if (ContextLocked) { AcpiOsReleaseMutex (ContextMutex); } if (ACPI_FAILURE (Status)) { ACPI_EXCEPTION ((AE_INFO, Status, "Returned by Handler for [%s]", AcpiUtGetRegionName (RegionObj->Region.SpaceId))); /* * Special case for an EC timeout. These are seen so frequently * that an additional error message is helpful */ if ((RegionObj->Region.SpaceId == ACPI_ADR_SPACE_EC) && (Status == AE_TIME)) { ACPI_ERROR ((AE_INFO, "Timeout from EC hardware or EC device driver")); } } ReEnterInterpreter: if (!(HandlerDesc->AddressSpace.HandlerFlags & ACPI_ADDR_HANDLER_DEFAULT_INSTALLED)) { /* * We just returned from a non-default handler, we must re-enter the * interpreter */ AcpiExEnterInterpreter (); } return_ACPI_STATUS (Status); } /******************************************************************************* * * FUNCTION: AcpiEvDetachRegion * * PARAMETERS: RegionObj - Region Object * AcpiNsIsLocked - Namespace Region Already Locked? * * RETURN: None * * DESCRIPTION: Break the association between the handler and the region * this is a two way association. * ******************************************************************************/ void AcpiEvDetachRegion ( ACPI_OPERAND_OBJECT *RegionObj, BOOLEAN AcpiNsIsLocked) { ACPI_OPERAND_OBJECT *HandlerObj; ACPI_OPERAND_OBJECT *ObjDesc; ACPI_OPERAND_OBJECT *StartDesc; ACPI_OPERAND_OBJECT **LastObjPtr; ACPI_ADR_SPACE_SETUP RegionSetup; void **RegionContext; ACPI_OPERAND_OBJECT *RegionObj2; ACPI_STATUS Status; ACPI_FUNCTION_TRACE (EvDetachRegion); RegionObj2 = AcpiNsGetSecondaryObject (RegionObj); if (!RegionObj2) { return_VOID; } RegionContext = &RegionObj2->Extra.RegionContext; /* Get the address handler from the region object */ HandlerObj = RegionObj->Region.Handler; if (!HandlerObj) { /* This region has no handler, all done */ return_VOID; } /* Find this region in the handler's list */ ObjDesc = HandlerObj->AddressSpace.RegionList; StartDesc = ObjDesc; LastObjPtr = &HandlerObj->AddressSpace.RegionList; while (ObjDesc) { /* Is this the correct Region? */ if (ObjDesc == RegionObj) { ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION, "Removing Region %p from address handler %p\n", RegionObj, HandlerObj)); /* This is it, remove it from the handler's list */ *LastObjPtr = ObjDesc->Region.Next; ObjDesc->Region.Next = NULL; /* Must clear field */ if (AcpiNsIsLocked) { Status = AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); if (ACPI_FAILURE (Status)) { return_VOID; } } /* Now stop region accesses by executing the _REG method */ Status = AcpiEvExecuteRegMethod (RegionObj, ACPI_REG_DISCONNECT); if (ACPI_FAILURE (Status)) { ACPI_EXCEPTION ((AE_INFO, Status, "from region _REG, [%s]", AcpiUtGetRegionName (RegionObj->Region.SpaceId))); } if (AcpiNsIsLocked) { Status = AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); if (ACPI_FAILURE (Status)) { return_VOID; } } /* * If the region has been activated, call the setup handler with * the deactivate notification */ if (RegionObj->Region.Flags & AOPOBJ_SETUP_COMPLETE) { RegionSetup = HandlerObj->AddressSpace.Setup; Status = RegionSetup (RegionObj, ACPI_REGION_DEACTIVATE, HandlerObj->AddressSpace.Context, RegionContext); /* * RegionContext should have been released by the deactivate * operation. We don't need access to it anymore here. */ if (RegionContext) { *RegionContext = NULL; } /* Init routine may fail, Just ignore errors */ if (ACPI_FAILURE (Status)) { ACPI_EXCEPTION ((AE_INFO, Status, "from region handler - deactivate, [%s]", AcpiUtGetRegionName (RegionObj->Region.SpaceId))); } RegionObj->Region.Flags &= ~(AOPOBJ_SETUP_COMPLETE); } /* * Remove handler reference in the region * * NOTE: this doesn't mean that the region goes away, the region * is just inaccessible as indicated to the _REG method * * If the region is on the handler's list, this must be the * region's handler */ RegionObj->Region.Handler = NULL; AcpiUtRemoveReference (HandlerObj); return_VOID; } /* Walk the linked list of handlers */ LastObjPtr = &ObjDesc->Region.Next; ObjDesc = ObjDesc->Region.Next; /* Prevent infinite loop if list is corrupted */ if (ObjDesc == StartDesc) { ACPI_ERROR ((AE_INFO, "Circular handler list in region object %p", RegionObj)); return_VOID; } } /* If we get here, the region was not in the handler's region list */ ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION, "Cannot remove region %p from address handler %p\n", RegionObj, HandlerObj)); return_VOID; } /******************************************************************************* * * FUNCTION: AcpiEvAttachRegion * * PARAMETERS: HandlerObj - Handler Object * RegionObj - Region Object * AcpiNsIsLocked - Namespace Region Already Locked? * * RETURN: None * * DESCRIPTION: Create the association between the handler and the region * this is a two way association. * ******************************************************************************/ ACPI_STATUS AcpiEvAttachRegion ( ACPI_OPERAND_OBJECT *HandlerObj, ACPI_OPERAND_OBJECT *RegionObj, BOOLEAN AcpiNsIsLocked) { ACPI_FUNCTION_TRACE (EvAttachRegion); /* Install the region's handler */ if (RegionObj->Region.Handler) { return_ACPI_STATUS (AE_ALREADY_EXISTS); } ACPI_DEBUG_PRINT ((ACPI_DB_OPREGION, "Adding Region [%4.4s] %p to address handler %p [%s]\n", AcpiUtGetNodeName (RegionObj->Region.Node), RegionObj, HandlerObj, AcpiUtGetRegionName (RegionObj->Region.SpaceId))); /* Link this region to the front of the handler's list */ RegionObj->Region.Next = HandlerObj->AddressSpace.RegionList; HandlerObj->AddressSpace.RegionList = RegionObj; RegionObj->Region.Handler = HandlerObj; AcpiUtAddReference (HandlerObj); return_ACPI_STATUS (AE_OK); } /******************************************************************************* * * FUNCTION: AcpiEvExecuteRegMethod * * PARAMETERS: RegionObj - Region object * Function - Passed to _REG: On (1) or Off (0) * * RETURN: Status * * DESCRIPTION: Execute _REG method for a region * ******************************************************************************/ ACPI_STATUS AcpiEvExecuteRegMethod ( ACPI_OPERAND_OBJECT *RegionObj, UINT32 Function) { ACPI_EVALUATE_INFO *Info; ACPI_OPERAND_OBJECT *Args[3]; ACPI_OPERAND_OBJECT *RegionObj2; const ACPI_NAME *RegNamePtr = ACPI_CAST_PTR (ACPI_NAME, METHOD_NAME__REG); ACPI_NAMESPACE_NODE *MethodNode; ACPI_NAMESPACE_NODE *Node; ACPI_STATUS Status; ACPI_FUNCTION_TRACE (EvExecuteRegMethod); if (!AcpiGbl_NamespaceInitialized || RegionObj->Region.Handler == NULL) { return_ACPI_STATUS (AE_OK); } RegionObj2 = AcpiNsGetSecondaryObject (RegionObj); if (!RegionObj2) { return_ACPI_STATUS (AE_NOT_EXIST); } /* * Find any "_REG" method associated with this region definition. * The method should always be updated as this function may be * invoked after a namespace change. */ Node = RegionObj->Region.Node->Parent; Status = AcpiNsSearchOneScope ( *RegNamePtr, Node, ACPI_TYPE_METHOD, &MethodNode); if (ACPI_SUCCESS (Status)) { /* * The _REG method is optional and there can be only one per * region definition. This will be executed when the handler is * attached or removed. */ RegionObj2->Extra.Method_REG = MethodNode; } if (RegionObj2->Extra.Method_REG == NULL) { return_ACPI_STATUS (AE_OK); } /* _REG(DISCONNECT) should be paired with _REG(CONNECT) */ if ((Function == ACPI_REG_CONNECT && RegionObj->Common.Flags & AOPOBJ_REG_CONNECTED) || (Function == ACPI_REG_DISCONNECT && !(RegionObj->Common.Flags & AOPOBJ_REG_CONNECTED))) { return_ACPI_STATUS (AE_OK); } /* Allocate and initialize the evaluation information block */ Info = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_EVALUATE_INFO)); if (!Info) { return_ACPI_STATUS (AE_NO_MEMORY); } Info->PrefixNode = RegionObj2->Extra.Method_REG; Info->RelativePathname = NULL; Info->Parameters = Args; Info->Flags = ACPI_IGNORE_RETURN_VALUE; /* * The _REG method has two arguments: * * Arg0 - Integer: * Operation region space ID Same value as RegionObj->Region.SpaceId * * Arg1 - Integer: * connection status 1 for connecting the handler, 0 for disconnecting * the handler (Passed as a parameter) */ Args[0] = AcpiUtCreateIntegerObject ((UINT64) RegionObj->Region.SpaceId); if (!Args[0]) { Status = AE_NO_MEMORY; goto Cleanup1; } Args[1] = AcpiUtCreateIntegerObject ((UINT64) Function); if (!Args[1]) { Status = AE_NO_MEMORY; goto Cleanup2; } Args[2] = NULL; /* Terminate list */ /* Execute the method, no return value */ ACPI_DEBUG_EXEC ( AcpiUtDisplayInitPathname (ACPI_TYPE_METHOD, Info->PrefixNode, NULL)); Status = AcpiNsEvaluate (Info); AcpiUtRemoveReference (Args[1]); if (ACPI_FAILURE (Status)) { goto Cleanup2; } if (Function == ACPI_REG_CONNECT) { RegionObj->Common.Flags |= AOPOBJ_REG_CONNECTED; } else { RegionObj->Common.Flags &= ~AOPOBJ_REG_CONNECTED; } Cleanup2: AcpiUtRemoveReference (Args[0]); Cleanup1: ACPI_FREE (Info); return_ACPI_STATUS (Status); } /******************************************************************************* * * FUNCTION: AcpiEvExecuteRegMethods * * PARAMETERS: Node - Namespace node for the device * SpaceId - The address space ID * Function - Passed to _REG: On (1) or Off (0) * * RETURN: None * * DESCRIPTION: Run all _REG methods for the input Space ID; * Note: assumes namespace is locked, or system init time. * ******************************************************************************/ void AcpiEvExecuteRegMethods ( ACPI_NAMESPACE_NODE *Node, ACPI_ADR_SPACE_TYPE SpaceId, UINT32 Function) { ACPI_REG_WALK_INFO Info; ACPI_FUNCTION_TRACE (EvExecuteRegMethods); /* * These address spaces do not need a call to _REG, since the ACPI * specification defines them as: "must always be accessible". Since * they never change state (never become unavailable), no need to ever * call _REG on them. Also, a DataTable is not a "real" address space, * so do not call _REG. September 2018. */ if ((SpaceId == ACPI_ADR_SPACE_SYSTEM_MEMORY) || (SpaceId == ACPI_ADR_SPACE_SYSTEM_IO) || (SpaceId == ACPI_ADR_SPACE_DATA_TABLE)) { return_VOID; } Info.SpaceId = SpaceId; Info.Function = Function; Info.RegRunCount = 0; ACPI_DEBUG_PRINT_RAW ((ACPI_DB_NAMES, " Running _REG methods for SpaceId %s\n", AcpiUtGetRegionName (Info.SpaceId))); /* * Run all _REG methods for all Operation Regions for this space ID. This * is a separate walk in order to handle any interdependencies between * regions and _REG methods. (i.e. handlers must be installed for all * regions of this Space ID before we can run any _REG methods) */ (void) AcpiNsWalkNamespace (ACPI_TYPE_ANY, Node, ACPI_UINT32_MAX, ACPI_NS_WALK_UNLOCK, AcpiEvRegRun, NULL, &Info, NULL); /* * Special case for EC and GPIO: handle "orphan" _REG methods with * no region. */ if (SpaceId == ACPI_ADR_SPACE_EC || SpaceId == ACPI_ADR_SPACE_GPIO) { AcpiEvExecuteOrphanRegMethod (Node, SpaceId); } ACPI_DEBUG_PRINT_RAW ((ACPI_DB_NAMES, " Executed %u _REG methods for SpaceId %s\n", Info.RegRunCount, AcpiUtGetRegionName (Info.SpaceId))); return_VOID; } /******************************************************************************* * * FUNCTION: AcpiEvRegRun * * PARAMETERS: WalkNamespace callback * * DESCRIPTION: Run _REG method for region objects of the requested spaceID * ******************************************************************************/ static ACPI_STATUS AcpiEvRegRun ( ACPI_HANDLE ObjHandle, UINT32 Level, void *Context, void **ReturnValue) { ACPI_OPERAND_OBJECT *ObjDesc; ACPI_NAMESPACE_NODE *Node; ACPI_STATUS Status; ACPI_REG_WALK_INFO *Info; Info = ACPI_CAST_PTR (ACPI_REG_WALK_INFO, Context); /* Convert and validate the device handle */ Node = AcpiNsValidateHandle (ObjHandle); if (!Node) { return (AE_BAD_PARAMETER); } /* * We only care about regions and objects that are allowed to have * address space handlers */ if ((Node->Type != ACPI_TYPE_REGION) && (Node != AcpiGbl_RootNode)) { return (AE_OK); } /* Check for an existing internal object */ ObjDesc = AcpiNsGetAttachedObject (Node); if (!ObjDesc) { /* No object, just exit */ return (AE_OK); } /* Object is a Region */ if (ObjDesc->Region.SpaceId != Info->SpaceId) { /* This region is for a different address space, just ignore it */ return (AE_OK); } Info->RegRunCount++; Status = AcpiEvExecuteRegMethod (ObjDesc, Info->Function); return (Status); } /******************************************************************************* * * FUNCTION: AcpiEvExecuteOrphanRegMethod * * PARAMETERS: DeviceNode - Namespace node for an ACPI device * SpaceId - The address space ID * * RETURN: None * * DESCRIPTION: Execute an "orphan" _REG method that appears under an ACPI * device. This is a _REG method that has no corresponding region * within the device's scope. ACPI tables depending on these * "orphan" _REG methods have been seen for both EC and GPIO * Operation Regions. Presumably the Windows ACPI implementation * always calls the _REG method independent of the presence of * an actual Operation Region with the correct address space ID. * * MUTEX: Assumes the namespace is locked * ******************************************************************************/ static void AcpiEvExecuteOrphanRegMethod ( ACPI_NAMESPACE_NODE *DeviceNode, ACPI_ADR_SPACE_TYPE SpaceId) { ACPI_HANDLE RegMethod; ACPI_NAMESPACE_NODE *NextNode; ACPI_STATUS Status; ACPI_OBJECT_LIST Args; ACPI_OBJECT Objects[2]; ACPI_FUNCTION_TRACE (EvExecuteOrphanRegMethod); if (!DeviceNode) { return_VOID; } /* Namespace is currently locked, must release */ (void) AcpiUtReleaseMutex (ACPI_MTX_NAMESPACE); /* Get a handle to a _REG method immediately under the EC device */ Status = AcpiGetHandle (DeviceNode, METHOD_NAME__REG, &RegMethod); if (ACPI_FAILURE (Status)) { goto Exit; /* There is no _REG method present */ } /* * Execute the _REG method only if there is no Operation Region in * this scope with the Embedded Controller space ID. Otherwise, it * will already have been executed. Note, this allows for Regions * with other space IDs to be present; but the code below will then * execute the _REG method with the EmbeddedControl SpaceID argument. */ NextNode = AcpiNsGetNextNode (DeviceNode, NULL); while (NextNode) { if ((NextNode->Type == ACPI_TYPE_REGION) && (NextNode->Object) && (NextNode->Object->Region.SpaceId == SpaceId)) { goto Exit; /* Do not execute the _REG */ } NextNode = AcpiNsGetNextNode (DeviceNode, NextNode); } /* Evaluate the _REG(SpaceId,Connect) method */ Args.Count = 2; Args.Pointer = Objects; Objects[0].Type = ACPI_TYPE_INTEGER; Objects[0].Integer.Value = SpaceId; Objects[1].Type = ACPI_TYPE_INTEGER; Objects[1].Integer.Value = ACPI_REG_CONNECT; (void) AcpiEvaluateObject (RegMethod, NULL, &Args, NULL); Exit: /* We ignore all errors from above, don't care */ (void) AcpiUtAcquireMutex (ACPI_MTX_NAMESPACE); return_VOID; }