/****************************************************************************** * * Module Name: evgpe - General Purpose Event handling and dispatch * *****************************************************************************/ /****************************************************************************** * * 1. Copyright Notice * * Some or all of this work - Copyright (c) 1999 - 2010, 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. * *****************************************************************************/ #include "acpi.h" #include "accommon.h" #include "acevents.h" #include "acnamesp.h" #define _COMPONENT ACPI_EVENTS ACPI_MODULE_NAME ("evgpe") /* 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, GpeRegisterInfo); /* 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); } return_ACPI_STATUS (AE_OK); } /******************************************************************************* * * FUNCTION: AcpiEvEnableGpe * * PARAMETERS: GpeEventInfo - GPE to enable * * RETURN: Status * * DESCRIPTION: Clear a GPE of stale events and enable it. * ******************************************************************************/ ACPI_STATUS AcpiEvEnableGpe ( ACPI_GPE_EVENT_INFO *GpeEventInfo) { ACPI_STATUS Status; ACPI_FUNCTION_TRACE (EvEnableGpe); /* * We will only allow a GPE to be enabled if it has either an * associated method (_Lxx/_Exx) or a handler. Otherwise, the * GPE will be immediately disabled by AcpiEvGpeDispatch the * first time it fires. */ if (!(GpeEventInfo->Flags & ACPI_GPE_DISPATCH_MASK)) { return_ACPI_STATUS (AE_NO_HANDLER); } /* Clear the GPE (of stale events) */ Status = AcpiHwClearGpe (GpeEventInfo); if (ACPI_FAILURE (Status)) { return_ACPI_STATUS (Status); } /* Enable the requested GPE */ Status = AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_ENABLE); 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_STATUS Status; ACPI_GPE_BLOCK_INFO *GpeBlock; ACPI_GPE_REGISTER_INFO *GpeRegisterInfo; UINT32 IntStatus = ACPI_INTERRUPT_NOT_HANDLED; UINT8 EnabledStatusByte; UINT32 StatusReg; UINT32 EnableReg; 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) { /* * 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]; /* Read the Status Register */ Status = AcpiHwRead (&StatusReg, &GpeRegisterInfo->StatusAddress); if (ACPI_FAILURE (Status)) { goto UnlockAndExit; } /* Read the Enable Register */ Status = AcpiHwRead (&EnableReg, &GpeRegisterInfo->EnableAddress); if (ACPI_FAILURE (Status)) { goto UnlockAndExit; } ACPI_DEBUG_PRINT ((ACPI_DB_INTERRUPTS, "Read GPE Register at GPE%X: Status=%02X, Enable=%02X\n", GpeRegisterInfo->BaseGpeNumber, StatusReg, EnableReg)); /* Check if there is anything active at all in this register */ EnabledStatusByte = (UINT8) (StatusReg & EnableReg); if (!EnabledStatusByte) { /* No active GPEs in this register, move on */ continue; } /* Now look at the individual GPEs in this byte register */ for (j = 0; j < ACPI_GPE_REGISTER_WIDTH; j++) { /* Examine one GPE bit */ if (EnabledStatusByte & (1 << j)) { /* * Found an active GPE. Dispatch the event to a handler * or method. */ IntStatus |= AcpiEvGpeDispatch ( &GpeBlock->EventInfo[((ACPI_SIZE) i * ACPI_GPE_REGISTER_WIDTH) + j], j + GpeRegisterInfo->BaseGpeNumber); } } } GpeBlock = GpeBlock->Next; } UnlockAndExit: 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; ACPI_GPE_EVENT_INFO *LocalGpeEventInfo; ACPI_EVALUATE_INFO *Info; ACPI_FUNCTION_TRACE (EvAsynchExecuteGpeMethod); /* Allocate a local GPE block */ LocalGpeEventInfo = ACPI_ALLOCATE_ZEROED (sizeof (ACPI_GPE_EVENT_INFO)); if (!LocalGpeEventInfo) { ACPI_EXCEPTION ((AE_INFO, AE_NO_MEMORY, "while handling a GPE")); return_VOID; } Status = AcpiUtAcquireMutex (ACPI_MTX_EVENTS); if (ACPI_FAILURE (Status)) { return_VOID; } /* Must revalidate the GpeNumber/GpeBlock */ if (!AcpiEvValidGpeEvent (GpeEventInfo)) { Status = AcpiUtReleaseMutex (ACPI_MTX_EVENTS); return_VOID; } /* * Take a snapshot of the GPE info for this level - we copy the info to * prevent a race condition with RemoveHandler/RemoveBlock. */ ACPI_MEMCPY (LocalGpeEventInfo, GpeEventInfo, sizeof (ACPI_GPE_EVENT_INFO)); Status = AcpiUtReleaseMutex (ACPI_MTX_EVENTS); if (ACPI_FAILURE (Status)) { return_VOID; } /* * Must check for control method type dispatch one more time to avoid a * race with EvGpeInstallHandler */ if ((LocalGpeEventInfo->Flags & ACPI_GPE_DISPATCH_MASK) == 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 = LocalGpeEventInfo->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 (LocalGpeEventInfo->Dispatch.MethodNode))); } } /* Defer enabling of GPE until all notify handlers are done */ Status = AcpiOsExecute (OSL_NOTIFY_HANDLER, AcpiEvAsynchEnableGpe, LocalGpeEventInfo); if (ACPI_FAILURE (Status)) { ACPI_FREE (LocalGpeEventInfo); } return_VOID; } /******************************************************************************* * * FUNCTION: AcpiEvAsynchEnableGpe * * PARAMETERS: Context (GpeEventInfo) - Info for this GPE * * 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_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)) { goto Exit; } } /* * Enable this GPE, conditionally. This means that the GPE will only be * physically enabled if the EnableForRun bit is set in the EventInfo */ (void) AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_CONDITIONAL_ENABLE); Exit: ACPI_FREE (GpeEventInfo); return; } /******************************************************************************* * * FUNCTION: AcpiEvGpeDispatch * * PARAMETERS: 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. * * This function executes at interrupt level. * ******************************************************************************/ UINT32 AcpiEvGpeDispatch ( ACPI_GPE_EVENT_INFO *GpeEventInfo, UINT32 GpeNumber) { ACPI_STATUS Status; ACPI_FUNCTION_TRACE (EvGpeDispatch); AcpiGpeCount++; /* * 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[0x%2X]", GpeNumber)); return_UINT32 (ACPI_INTERRUPT_NOT_HANDLED); } } /* * 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, we disable this GPE to prevent further such pointless * events from firing. */ switch (GpeEventInfo->Flags & ACPI_GPE_DISPATCH_MASK) { case ACPI_GPE_DISPATCH_HANDLER: /* * Invoke the installed handler (at interrupt level) * Ignore return status for now. * TBD: leave GPE disabled on error? */ (void) GpeEventInfo->Dispatch.Handler->Address ( GpeEventInfo->Dispatch.Handler->Context); /* It is now safe to clear level-triggered events. */ if ((GpeEventInfo->Flags & ACPI_GPE_XRUPT_TYPE_MASK) == ACPI_GPE_LEVEL_TRIGGERED) { Status = AcpiHwClearGpe (GpeEventInfo); if (ACPI_FAILURE (Status)) { ACPI_EXCEPTION ((AE_INFO, Status, "Unable to clear GPE[0x%2X]", GpeNumber)); return_UINT32 (ACPI_INTERRUPT_NOT_HANDLED); } } break; case ACPI_GPE_DISPATCH_METHOD: /* * Disable the GPE, so it doesn't keep firing before the method has a * chance to run (it runs asynchronously with interrupts enabled). */ Status = AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_DISABLE); if (ACPI_FAILURE (Status)) { ACPI_EXCEPTION ((AE_INFO, Status, "Unable to disable GPE[0x%2X]", GpeNumber)); return_UINT32 (ACPI_INTERRUPT_NOT_HANDLED); } /* * 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[0x%2X] - 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[0x%2X], disabling event", GpeNumber)); /* * Disable the GPE. The GPE will remain disabled until a handler * is installed or ACPICA is restarted. */ Status = AcpiHwLowSetGpe (GpeEventInfo, ACPI_GPE_DISABLE); if (ACPI_FAILURE (Status)) { ACPI_EXCEPTION ((AE_INFO, Status, "Unable to disable GPE[0x%2X]", GpeNumber)); return_UINT32 (ACPI_INTERRUPT_NOT_HANDLED); } break; } return_UINT32 (ACPI_INTERRUPT_HANDLED); }