/****************************************************************************** * * Module Name: evgpe - General Purpose Event handling and dispatch * *****************************************************************************/ /****************************************************************************** * * 1. Copyright Notice * * Some or all of this work - Copyright (c) 1999 - 2018, 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 #include #include #include #define _COMPONENT ACPI_EVENTS ACPI_MODULE_NAME ("evgpe") #if (!ACPI_REDUCED_HARDWARE) /* Entire module */ /* Local prototypes */ static void ACPI_SYSTEM_XFACE AcpiEvAsynchExecuteGpeMethod ( void *Context); static void ACPI_SYSTEM_XFACE AcpiEvAsynchEnableGpe ( void *Context); /******************************************************************************* * * FUNCTION: AcpiEvUpdateGpeEnableMask * * PARAMETERS: GpeEventInfo - GPE to update * * RETURN: Status * * DESCRIPTION: Updates GPE register enable mask based upon whether there are * runtime references to this GPE * ******************************************************************************/ ACPI_STATUS AcpiEvUpdateGpeEnableMask ( ACPI_GPE_EVENT_INFO *GpeEventInfo) { ACPI_GPE_REGISTER_INFO *GpeRegisterInfo; UINT32 RegisterBit; ACPI_FUNCTION_TRACE (EvUpdateGpeEnableMask); GpeRegisterInfo = GpeEventInfo->RegisterInfo; if (!GpeRegisterInfo) { return_ACPI_STATUS (AE_NOT_EXIST); } RegisterBit = AcpiHwGetGpeRegisterBit (GpeEventInfo); /* Clear the run bit up front */ ACPI_CLEAR_BIT (GpeRegisterInfo->EnableForRun, RegisterBit); /* Set the mask bit only if there are references to this GPE */ if (GpeEventInfo->RuntimeCount) { ACPI_SET_BIT (GpeRegisterInfo->EnableForRun, (UINT8) RegisterBit); } GpeRegisterInfo->EnableMask = GpeRegisterInfo->EnableForRun; return_ACPI_STATUS (AE_OK); } /******************************************************************************* * * FUNCTION: AcpiEvEnableGpe * * PARAMETERS: GpeEventInfo - GPE to enable * * RETURN: Status * * DESCRIPTION: Enable a GPE. * ******************************************************************************/ ACPI_STATUS AcpiEvEnableGpe ( ACPI_GPE_EVENT_INFO *GpeEventInfo) { ACPI_STATUS Status; ACPI_FUNCTION_TRACE (EvEnableGpe); /* Enable the requested GPE */ Status = AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_ENABLE); return_ACPI_STATUS (Status); } /******************************************************************************* * * FUNCTION: AcpiEvMaskGpe * * PARAMETERS: GpeEventInfo - GPE to be blocked/unblocked * IsMasked - Whether the GPE is masked or not * * RETURN: Status * * DESCRIPTION: Unconditionally mask/unmask a GPE during runtime. * ******************************************************************************/ ACPI_STATUS AcpiEvMaskGpe ( ACPI_GPE_EVENT_INFO *GpeEventInfo, BOOLEAN IsMasked) { ACPI_GPE_REGISTER_INFO *GpeRegisterInfo; UINT32 RegisterBit; ACPI_FUNCTION_TRACE (EvMaskGpe); GpeRegisterInfo = GpeEventInfo->RegisterInfo; if (!GpeRegisterInfo) { return_ACPI_STATUS (AE_NOT_EXIST); } RegisterBit = AcpiHwGetGpeRegisterBit (GpeEventInfo); /* Perform the action */ if (IsMasked) { if (RegisterBit & GpeRegisterInfo->MaskForRun) { return_ACPI_STATUS (AE_BAD_PARAMETER); } (void) AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_DISABLE); ACPI_SET_BIT (GpeRegisterInfo->MaskForRun, (UINT8) RegisterBit); } else { if (!(RegisterBit & GpeRegisterInfo->MaskForRun)) { return_ACPI_STATUS (AE_BAD_PARAMETER); } ACPI_CLEAR_BIT (GpeRegisterInfo->MaskForRun, (UINT8) RegisterBit); if (GpeEventInfo->RuntimeCount && !GpeEventInfo->DisableForDispatch) { (void) AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_ENABLE); } } return_ACPI_STATUS (AE_OK); } /******************************************************************************* * * FUNCTION: AcpiEvAddGpeReference * * PARAMETERS: GpeEventInfo - Add a reference to this GPE * * RETURN: Status * * DESCRIPTION: Add a reference to a GPE. On the first reference, the GPE is * hardware-enabled. * ******************************************************************************/ ACPI_STATUS AcpiEvAddGpeReference ( ACPI_GPE_EVENT_INFO *GpeEventInfo) { ACPI_STATUS Status = AE_OK; ACPI_FUNCTION_TRACE (EvAddGpeReference); if (GpeEventInfo->RuntimeCount == ACPI_UINT8_MAX) { return_ACPI_STATUS (AE_LIMIT); } GpeEventInfo->RuntimeCount++; if (GpeEventInfo->RuntimeCount == 1) { /* Enable on first reference */ Status = AcpiEvUpdateGpeEnableMask (GpeEventInfo); if (ACPI_SUCCESS (Status)) { Status = AcpiEvEnableGpe (GpeEventInfo); } if (ACPI_FAILURE (Status)) { GpeEventInfo->RuntimeCount--; } } return_ACPI_STATUS (Status); } /******************************************************************************* * * FUNCTION: AcpiEvRemoveGpeReference * * PARAMETERS: GpeEventInfo - Remove a reference to this GPE * * RETURN: Status * * DESCRIPTION: Remove a reference to a GPE. When the last reference is * removed, the GPE is hardware-disabled. * ******************************************************************************/ ACPI_STATUS AcpiEvRemoveGpeReference ( ACPI_GPE_EVENT_INFO *GpeEventInfo) { ACPI_STATUS Status = AE_OK; ACPI_FUNCTION_TRACE (EvRemoveGpeReference); if (!GpeEventInfo->RuntimeCount) { return_ACPI_STATUS (AE_LIMIT); } GpeEventInfo->RuntimeCount--; if (!GpeEventInfo->RuntimeCount) { /* Disable on last reference */ Status = AcpiEvUpdateGpeEnableMask (GpeEventInfo); if (ACPI_SUCCESS (Status)) { Status = AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_DISABLE); } if (ACPI_FAILURE (Status)) { GpeEventInfo->RuntimeCount++; } } return_ACPI_STATUS (Status); } /******************************************************************************* * * FUNCTION: AcpiEvLowGetGpeInfo * * PARAMETERS: GpeNumber - Raw GPE number * GpeBlock - A GPE info block * * RETURN: A GPE EventInfo struct. NULL if not a valid GPE (The GpeNumber * is not within the specified GPE block) * * DESCRIPTION: Returns the EventInfo struct associated with this GPE. This is * the low-level implementation of EvGetGpeEventInfo. * ******************************************************************************/ ACPI_GPE_EVENT_INFO * AcpiEvLowGetGpeInfo ( UINT32 GpeNumber, ACPI_GPE_BLOCK_INFO *GpeBlock) { UINT32 GpeIndex; /* * Validate that the GpeNumber is within the specified GpeBlock. * (Two steps) */ if (!GpeBlock || (GpeNumber < GpeBlock->BlockBaseNumber)) { return (NULL); } GpeIndex = GpeNumber - GpeBlock->BlockBaseNumber; if (GpeIndex >= GpeBlock->GpeCount) { return (NULL); } return (&GpeBlock->EventInfo[GpeIndex]); } /******************************************************************************* * * FUNCTION: AcpiEvGetGpeEventInfo * * PARAMETERS: GpeDevice - Device node. NULL for GPE0/GPE1 * GpeNumber - Raw GPE number * * RETURN: A GPE EventInfo struct. NULL if not a valid GPE * * DESCRIPTION: Returns the EventInfo struct associated with this GPE. * Validates the GpeBlock and the GpeNumber * * Should be called only when the GPE lists are semaphore locked * and not subject to change. * ******************************************************************************/ ACPI_GPE_EVENT_INFO * AcpiEvGetGpeEventInfo ( ACPI_HANDLE GpeDevice, UINT32 GpeNumber) { ACPI_OPERAND_OBJECT *ObjDesc; ACPI_GPE_EVENT_INFO *GpeInfo; UINT32 i; ACPI_FUNCTION_ENTRY (); /* A NULL GpeDevice means use the FADT-defined GPE block(s) */ if (!GpeDevice) { /* Examine GPE Block 0 and 1 (These blocks are permanent) */ for (i = 0; i < ACPI_MAX_GPE_BLOCKS; i++) { GpeInfo = AcpiEvLowGetGpeInfo (GpeNumber, AcpiGbl_GpeFadtBlocks[i]); if (GpeInfo) { return (GpeInfo); } } /* The GpeNumber was not in the range of either FADT GPE block */ return (NULL); } /* A Non-NULL GpeDevice means this is a GPE Block Device */ ObjDesc = AcpiNsGetAttachedObject ((ACPI_NAMESPACE_NODE *) GpeDevice); if (!ObjDesc || !ObjDesc->Device.GpeBlock) { return (NULL); } return (AcpiEvLowGetGpeInfo (GpeNumber, ObjDesc->Device.GpeBlock)); } /******************************************************************************* * * FUNCTION: AcpiEvGpeDetect * * PARAMETERS: GpeXruptList - Interrupt block for this interrupt. * Can have multiple GPE blocks attached. * * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED * * DESCRIPTION: Detect if any GP events have occurred. This function is * executed at interrupt level. * ******************************************************************************/ UINT32 AcpiEvGpeDetect ( ACPI_GPE_XRUPT_INFO *GpeXruptList) { ACPI_GPE_BLOCK_INFO *GpeBlock; ACPI_NAMESPACE_NODE *GpeDevice; ACPI_GPE_REGISTER_INFO *GpeRegisterInfo; ACPI_GPE_EVENT_INFO *GpeEventInfo; UINT32 GpeNumber; UINT32 IntStatus = ACPI_INTERRUPT_NOT_HANDLED; ACPI_CPU_FLAGS Flags; UINT32 i; UINT32 j; ACPI_FUNCTION_NAME (EvGpeDetect); /* Check for the case where there are no GPEs */ if (!GpeXruptList) { return (IntStatus); } /* * We need to obtain the GPE lock for both the data structs and registers * Note: Not necessary to obtain the hardware lock, since the GPE * registers are owned by the GpeLock. */ Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock); /* Examine all GPE blocks attached to this interrupt level */ GpeBlock = GpeXruptList->GpeBlockListHead; while (GpeBlock) { GpeDevice = GpeBlock->Node; /* * Read all of the 8-bit GPE status and enable registers in this GPE * block, saving all of them. Find all currently active GP events. */ for (i = 0; i < GpeBlock->RegisterCount; i++) { /* Get the next status/enable pair */ GpeRegisterInfo = &GpeBlock->RegisterInfo[i]; /* * Optimization: If there are no GPEs enabled within this * register, we can safely ignore the entire register. */ if (!(GpeRegisterInfo->EnableForRun | GpeRegisterInfo->EnableForWake)) { ACPI_DEBUG_PRINT ((ACPI_DB_INTERRUPTS, "Ignore disabled registers for GPE %02X-%02X: " "RunEnable=%02X, WakeEnable=%02X\n", GpeRegisterInfo->BaseGpeNumber, GpeRegisterInfo->BaseGpeNumber + (ACPI_GPE_REGISTER_WIDTH - 1), GpeRegisterInfo->EnableForRun, GpeRegisterInfo->EnableForWake)); continue; } /* Now look at the individual GPEs in this byte register */ for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) { /* Detect and dispatch one GPE bit */ GpeEventInfo = &GpeBlock->EventInfo[((ACPI_SIZE) i * ACPI_GPE_REGISTER_WIDTH) + j]; GpeNumber = j + GpeRegisterInfo->BaseGpeNumber; AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags); IntStatus |= AcpiEvDetectGpe ( GpeDevice, GpeEventInfo, GpeNumber); Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock); } } GpeBlock = GpeBlock->Next; } AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags); return (IntStatus); } /******************************************************************************* * * FUNCTION: AcpiEvAsynchExecuteGpeMethod * * PARAMETERS: Context (GpeEventInfo) - Info for this GPE * * RETURN: None * * DESCRIPTION: Perform the actual execution of a GPE control method. This * function is called from an invocation of AcpiOsExecute and * therefore does NOT execute at interrupt level - so that * the control method itself is not executed in the context of * an interrupt handler. * ******************************************************************************/ static void ACPI_SYSTEM_XFACE AcpiEvAsynchExecuteGpeMethod ( void *Context) { ACPI_GPE_EVENT_INFO *GpeEventInfo = Context; ACPI_STATUS Status = AE_OK; ACPI_EVALUATE_INFO *Info; ACPI_GPE_NOTIFY_INFO *Notify; ACPI_FUNCTION_TRACE (EvAsynchExecuteGpeMethod); /* Do the correct dispatch - normal method or implicit notify */ switch (ACPI_GPE_DISPATCH_TYPE (GpeEventInfo->Flags)) { case ACPI_GPE_DISPATCH_NOTIFY: /* * Implicit notify. * Dispatch a DEVICE_WAKE notify to the appropriate handler. * NOTE: the request is queued for execution after this method * completes. The notify handlers are NOT invoked synchronously * from this thread -- because handlers may in turn run other * control methods. * * June 2012: Expand implicit notify mechanism to support * notifies on multiple device objects. */ Notify = GpeEventInfo->Dispatch.NotifyList; while (ACPI_SUCCESS (Status) && Notify) { Status = AcpiEvQueueNotifyRequest ( Notify->DeviceNode, ACPI_NOTIFY_DEVICE_WAKE); Notify = Notify->Next; } break; case ACPI_GPE_DISPATCH_METHOD: /* Allocate the evaluation information block */ Info = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_EVALUATE_INFO)); if (!Info) { Status = AE_NO_MEMORY; } else { /* * Invoke the GPE Method (_Lxx, _Exx) i.e., evaluate the * _Lxx/_Exx control method that corresponds to this GPE */ Info->PrefixNode = GpeEventInfo->Dispatch.MethodNode; Info->Flags = ACPI_IGNORE_RETURN_VALUE; Status = AcpiNsEvaluate (Info); ACPI_FREE (Info); } if (ACPI_FAILURE (Status)) { ACPI_EXCEPTION ((AE_INFO, Status, "while evaluating GPE method [%4.4s]", AcpiUtGetNodeName (GpeEventInfo->Dispatch.MethodNode))); } break; default: goto ErrorExit; /* Should never happen */ } /* Defer enabling of GPE until all notify handlers are done */ Status = AcpiOsExecute (OSL_NOTIFY_HANDLER, AcpiEvAsynchEnableGpe, GpeEventInfo); if (ACPI_SUCCESS (Status)) { return_VOID; } ErrorExit: AcpiEvAsynchEnableGpe (GpeEventInfo); return_VOID; } /******************************************************************************* * * FUNCTION: AcpiEvAsynchEnableGpe * * PARAMETERS: Context (GpeEventInfo) - Info for this GPE * Callback from AcpiOsExecute * * RETURN: None * * DESCRIPTION: Asynchronous clear/enable for GPE. This allows the GPE to * complete (i.e., finish execution of Notify) * ******************************************************************************/ static void ACPI_SYSTEM_XFACE AcpiEvAsynchEnableGpe ( void *Context) { ACPI_GPE_EVENT_INFO *GpeEventInfo = Context; ACPI_CPU_FLAGS Flags; Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock); (void) AcpiEvFinishGpe (GpeEventInfo); AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags); return; } /******************************************************************************* * * FUNCTION: AcpiEvFinishGpe * * PARAMETERS: GpeEventInfo - Info for this GPE * * RETURN: Status * * DESCRIPTION: Clear/Enable a GPE. Common code that is used after execution * of a GPE method or a synchronous or asynchronous GPE handler. * ******************************************************************************/ ACPI_STATUS AcpiEvFinishGpe ( ACPI_GPE_EVENT_INFO *GpeEventInfo) { ACPI_STATUS Status; if ((GpeEventInfo->Flags & ACPI_GPE_XRUPT_TYPE_MASK) == ACPI_GPE_LEVEL_TRIGGERED) { /* * GPE is level-triggered, we clear the GPE status bit after * handling the event. */ Status = AcpiHwClearGpe (GpeEventInfo); if (ACPI_FAILURE (Status)) { return (Status); } } /* * Enable this GPE, conditionally. This means that the GPE will * only be physically enabled if the EnableMask bit is set * in the EventInfo. */ (void) AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_CONDITIONAL_ENABLE); GpeEventInfo->DisableForDispatch = FALSE; return (AE_OK); } /******************************************************************************* * * FUNCTION: AcpiEvDetectGpe * * PARAMETERS: GpeDevice - Device node. NULL for GPE0/GPE1 * GpeEventInfo - Info for this GPE * GpeNumber - Number relative to the parent GPE block * * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED * * DESCRIPTION: Detect and dispatch a General Purpose Event to either a function * (e.g. EC) or method (e.g. _Lxx/_Exx) handler. * NOTE: GPE is W1C, so it is possible to handle a single GPE from both * task and irq context in parallel as long as the process to * detect and mask the GPE is atomic. * However the atomicity of ACPI_GPE_DISPATCH_RAW_HANDLER is * dependent on the raw handler itself. * ******************************************************************************/ UINT32 AcpiEvDetectGpe ( ACPI_NAMESPACE_NODE *GpeDevice, ACPI_GPE_EVENT_INFO *GpeEventInfo, UINT32 GpeNumber) { UINT32 IntStatus = ACPI_INTERRUPT_NOT_HANDLED; UINT8 EnabledStatusByte; UINT64 StatusReg; UINT64 EnableReg; UINT32 RegisterBit; ACPI_GPE_REGISTER_INFO *GpeRegisterInfo; ACPI_GPE_HANDLER_INFO *GpeHandlerInfo; ACPI_CPU_FLAGS Flags; ACPI_STATUS Status; ACPI_FUNCTION_TRACE (EvGpeDetect); Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock); /* Get the info block for the entire GPE register */ GpeRegisterInfo = GpeEventInfo->RegisterInfo; /* Get the register bitmask for this GPE */ RegisterBit = AcpiHwGetGpeRegisterBit (GpeEventInfo); /* GPE currently enabled (enable bit == 1)? */ Status = AcpiHwRead (&EnableReg, &GpeRegisterInfo->EnableAddress); if (ACPI_FAILURE (Status)) { goto ErrorExit; } /* GPE currently active (status bit == 1)? */ Status = AcpiHwRead (&StatusReg, &GpeRegisterInfo->StatusAddress); if (ACPI_FAILURE (Status)) { goto ErrorExit; } /* Check if there is anything active at all in this GPE */ ACPI_DEBUG_PRINT ((ACPI_DB_INTERRUPTS, "Read registers for GPE %02X: Status=%02X, Enable=%02X, " "RunEnable=%02X, WakeEnable=%02X\n", GpeNumber, (UINT32) (StatusReg & RegisterBit), (UINT32) (EnableReg & RegisterBit), GpeRegisterInfo->EnableForRun, GpeRegisterInfo->EnableForWake)); EnabledStatusByte = (UINT8) (StatusReg & EnableReg); if (!(EnabledStatusByte & RegisterBit)) { goto ErrorExit; } /* Invoke global event handler if present */ AcpiGpeCount++; if (AcpiGbl_GlobalEventHandler) { AcpiGbl_GlobalEventHandler (ACPI_EVENT_TYPE_GPE, GpeDevice, GpeNumber, AcpiGbl_GlobalEventHandlerContext); } /* Found an active GPE */ if (ACPI_GPE_DISPATCH_TYPE (GpeEventInfo->Flags) == ACPI_GPE_DISPATCH_RAW_HANDLER) { /* Dispatch the event to a raw handler */ GpeHandlerInfo = GpeEventInfo->Dispatch.Handler; /* * There is no protection around the namespace node * and the GPE handler to ensure a safe destruction * because: * 1. The namespace node is expected to always * exist after loading a table. * 2. The GPE handler is expected to be flushed by * AcpiOsWaitEventsComplete() before the * destruction. */ AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags); IntStatus |= GpeHandlerInfo->Address ( GpeDevice, GpeNumber, GpeHandlerInfo->Context); Flags = AcpiOsAcquireLock (AcpiGbl_GpeLock); } else { /* Dispatch the event to a standard handler or method. */ IntStatus |= AcpiEvGpeDispatch (GpeDevice, GpeEventInfo, GpeNumber); } ErrorExit: AcpiOsReleaseLock (AcpiGbl_GpeLock, Flags); return (IntStatus); } /******************************************************************************* * * FUNCTION: AcpiEvGpeDispatch * * PARAMETERS: GpeDevice - Device node. NULL for GPE0/GPE1 * GpeEventInfo - Info for this GPE * GpeNumber - Number relative to the parent GPE block * * RETURN: INTERRUPT_HANDLED or INTERRUPT_NOT_HANDLED * * DESCRIPTION: Dispatch a General Purpose Event to either a function (e.g. EC) * or method (e.g. _Lxx/_Exx) handler. * ******************************************************************************/ UINT32 AcpiEvGpeDispatch ( ACPI_NAMESPACE_NODE *GpeDevice, ACPI_GPE_EVENT_INFO *GpeEventInfo, UINT32 GpeNumber) { ACPI_STATUS Status; UINT32 ReturnValue; ACPI_FUNCTION_TRACE (EvGpeDispatch); /* * Always disable the GPE so that it does not keep firing before * any asynchronous activity completes (either from the execution * of a GPE method or an asynchronous GPE handler.) * * If there is no handler or method to run, just disable the * GPE and leave it disabled permanently to prevent further such * pointless events from firing. */ Status = AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_DISABLE); if (ACPI_FAILURE (Status)) { ACPI_EXCEPTION ((AE_INFO, Status, "Unable to disable GPE %02X", GpeNumber)); return_UINT32 (ACPI_INTERRUPT_NOT_HANDLED); } /* * If edge-triggered, clear the GPE status bit now. Note that * level-triggered events are cleared after the GPE is serviced. */ if ((GpeEventInfo->Flags & ACPI_GPE_XRUPT_TYPE_MASK) == ACPI_GPE_EDGE_TRIGGERED) { Status = AcpiHwClearGpe (GpeEventInfo); if (ACPI_FAILURE (Status)) { ACPI_EXCEPTION ((AE_INFO, Status, "Unable to clear GPE %02X", GpeNumber)); (void) AcpiHwLowSetGpe ( GpeEventInfo, ACPI_GPE_CONDITIONAL_ENABLE); return_UINT32 (ACPI_INTERRUPT_NOT_HANDLED); } } GpeEventInfo->DisableForDispatch = TRUE; /* * Dispatch the GPE to either an installed handler or the control * method associated with this GPE (_Lxx or _Exx). If a handler * exists, we invoke it and do not attempt to run the method. * If there is neither a handler nor a method, leave the GPE * disabled. */ switch (ACPI_GPE_DISPATCH_TYPE (GpeEventInfo->Flags)) { case ACPI_GPE_DISPATCH_HANDLER: /* Invoke the installed handler (at interrupt level) */ ReturnValue = GpeEventInfo->Dispatch.Handler->Address ( GpeDevice, GpeNumber, GpeEventInfo->Dispatch.Handler->Context); /* If requested, clear (if level-triggered) and reenable the GPE */ if (ReturnValue & ACPI_REENABLE_GPE) { (void) AcpiEvFinishGpe (GpeEventInfo); } break; case ACPI_GPE_DISPATCH_METHOD: case ACPI_GPE_DISPATCH_NOTIFY: /* * Execute the method associated with the GPE * NOTE: Level-triggered GPEs are cleared after the method completes. */ Status = AcpiOsExecute (OSL_GPE_HANDLER, AcpiEvAsynchExecuteGpeMethod, GpeEventInfo); if (ACPI_FAILURE (Status)) { ACPI_EXCEPTION ((AE_INFO, Status, "Unable to queue handler for GPE %02X - event disabled", GpeNumber)); } break; default: /* * No handler or method to run! * 03/2010: This case should no longer be possible. We will not allow * a GPE to be enabled if it has no handler or method. */ ACPI_ERROR ((AE_INFO, "No handler or method for GPE %02X, disabling event", GpeNumber)); break; } return_UINT32 (ACPI_INTERRUPT_HANDLED); } #endif /* !ACPI_REDUCED_HARDWARE */