/******************************************************************************
*
* Module Name: evgpe - General Purpose Event handling and dispatch
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2018, Intel Corp.
* All rights reserved.
*
* 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.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* NO WARRANTY
* 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 MERCHANTIBILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR 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 DAMAGES.
*/
#include "acpi.h"
#include "accommon.h"
#include "acevents.h"
#include "acnamesp.h"
#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,
(unsigned int) (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 */