fxdevicebase.cpp

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/*++
 
Copyright (c) Microsoft Corporation
 
Module Name:
 
    FxDeviceBase.cpp
 
Abstract:
 
    This is the class implementation for the base device class.
 
Author:
 
 
 
Environment:
 
    Both kernel and user mode
 
Revision History:
 
--*/
 
#include "coreprivshared.hpp"
 
extern "C" {
// #include "FxDeviceBase.tmh"
}
 
FxDeviceBase::FxDeviceBase(
    __in PFX_DRIVER_GLOBALS FxDriverGlobals,
    __in FxDriver* Driver,
    __in WDFTYPE Type,
    __in USHORT Size
    ) :
    FxNonPagedObject(Type, Size, FxDriverGlobals)
{
    m_Driver = Driver;
 
    m_CallbackLockPtr = NULL;
    m_CallbackLockObjectPtr = NULL;
 
    m_DisposeList = NULL;
 
    m_DmaPacketTransactionStatus = FxDmaPacketTransactionCompleted;
 
    m_ExecutionLevel = WdfExecutionLevelInheritFromParent;
    m_SynchronizationScope = WdfSynchronizationScopeInheritFromParent;
 
    MarkPassiveDispose(ObjectDoNotLock);
    SetDeviceBase(this);
}
 
FxDeviceBase::~FxDeviceBase(
    VOID
    )
{
    if (m_DisposeList != NULL) {
        m_DisposeList->DeleteObject();
        m_DisposeList = NULL;
    }
 
    if (m_CallbackLockPtr != NULL) {
        delete m_CallbackLockPtr;
        m_CallbackLockPtr = NULL;
    }
}
 
_Must_inspect_result_
NTSTATUS
FxDeviceBase::QueryInterface(
    __inout FxQueryInterfaceParams* Params
    )
{
    switch (Params->Type) {
    case FX_TYPE_DEVICE_BASE:
        *Params->Object = this;
        break;
 
    case FX_TYPE_IHASCALLBACKS:
        *Params->Object = (IFxHasCallbacks*) this;
        break;
 
    default:
        return FxNonPagedObject::QueryInterface(Params); // __super call
    }
 
    return STATUS_SUCCESS;
}
 
NTSTATUS
FxDeviceBase::ConfigureConstraints(
    __in_opt PWDF_OBJECT_ATTRIBUTES ObjectAttributes
    )
{
    NTSTATUS            status;
    WDF_EXECUTION_LEVEL driverLevel;
    WDF_SYNCHRONIZATION_SCOPE driverScope;
 
    ASSERT(m_Driver != NULL);
 
    //
    // If WDF_OBJECT_ATTRIBUTES is specified, these override any
    // default settings.
    //
    if (ObjectAttributes != NULL) {
        m_ExecutionLevel = ObjectAttributes->ExecutionLevel;
        m_SynchronizationScope = ObjectAttributes->SynchronizationScope;
    }
 
    //
    // If no WDFDEVICE specific attributes are specified, we
    // get them from WDFDRIVER, which allows WDFDRIVER to
    // provide a default for all WDFDEVICE's created.
    //
    m_Driver->GetConstraints(&driverLevel, &driverScope);
 
    if (m_ExecutionLevel == WdfExecutionLevelInheritFromParent) {
        m_ExecutionLevel = driverLevel;
    }
 
    if (m_SynchronizationScope == WdfSynchronizationScopeInheritFromParent) {
        m_SynchronizationScope = driverScope;
    }
 
    //
    // Configure The Execution Level Constraint
    //
    if (m_ExecutionLevel == WdfExecutionLevelPassive) {
        m_CallbackLockPtr = new(GetDriverGlobals())
                                FxCallbackMutexLock(GetDriverGlobals());
        //
        // Currently, all event callbacks from FxDevice into the driver
        // are from PASSIVE_LEVEL threads, and there is no need to defer
        // to a system workitem like IoQueue. So we don't allocate and
        // setup an FxSystemWorkItem here.
        //
        // If the FxDevice starts raising events to the device driver
        // whose thread starts out above PASSIVE_LEVEL, then an FxSystemWorkItem
        // would need to be allocated when WdfExecutionLevelPassive is specified.
        //
        // (FDO and PDO variants of FxDevice may own their own event dispatch
        //  and deferral logic separate from FxDevice.)
        //
    }
    else {
        m_CallbackLockPtr  = new(GetDriverGlobals())
                                FxCallbackSpinLock(GetDriverGlobals());
    }
 
    //
    // Finish initializing the spin/mutex lock.
    //
    if (NULL == m_CallbackLockPtr) {
        status = STATUS_INSUFFICIENT_RESOURCES;
        DoTraceLevelMessage(
            GetDriverGlobals(), TRACE_LEVEL_ERROR, TRACINGOBJECT,
            "WDFDEVICE %p, could not allocate callback lock, %!STATUS!",
            GetHandle(), status);
        goto Done;
    }
 
    m_CallbackLockPtr->Initialize(this);
    m_CallbackLockObjectPtr = this;
 
    status = STATUS_SUCCESS;
 
Done:
    return status;
}
 
VOID
FxDeviceBase::GetConstraints(
    __out_opt WDF_EXECUTION_LEVEL*       ExecutionLevel,
    __out_opt WDF_SYNCHRONIZATION_SCOPE* SynchronizationScope
    )
{
    if (ExecutionLevel != NULL) {
        *ExecutionLevel = m_ExecutionLevel;
    }
 
    if (SynchronizationScope != NULL) {
        *SynchronizationScope = m_SynchronizationScope;
    }
}
 
FxCallbackLock*
FxDeviceBase::GetCallbackLockPtr(
    __out_opt FxObject** LockObject
    )
{
    if (LockObject != NULL) {
        *LockObject = m_CallbackLockObjectPtr;
    }
 
    return m_CallbackLockPtr;
}
 
 
VOID
FxDeviceBase::Init(
    __in MdDeviceObject DeviceObject,
    __in MdDeviceObject AttachedDevice,
    __in MdDeviceObject PhysicalDevice
    )
{
    m_DeviceObject.SetObject(DeviceObject);
    m_AttachedDevice.SetObject(AttachedDevice);
    m_PhysicalDevice.SetObject(PhysicalDevice);
}
 
FxDeviceBase*
FxDeviceBase::_SearchForDevice(
    __in FxObject* Object,
    __out_opt IFxHasCallbacks** Callbacks
    )
{
    FxObject* pParent, *pOrigParent;
    FxDeviceBase* pDeviceBase;
    FxQueryInterfaceParams cbParams = { (PVOID*) Callbacks, FX_TYPE_IHASCALLBACKS, 0 };
    PVOID pTag;
 
    pDeviceBase = Object->GetDeviceBase();
    if (pDeviceBase == NULL) {
        DoTraceLevelMessage(
            Object->GetDriverGlobals(), TRACE_LEVEL_ERROR, TRACINGOBJECT,
            "WDFHANDLE %p does not have a WDFDEVICE as an ancestor",
            Object->GetObjectHandle());
        return NULL;
    }
 
    if (Callbacks == NULL) {
        //
        // Caller is not interested in the callbacks interface, just return
        // now without searching for it.
        //
        return pDeviceBase;
    }
 
    //
    // Init out parameter.
    //
    *Callbacks = NULL;
 
    pOrigParent = Object;
    pTag = pOrigParent;
 
    //
    // By adding a reference now, we simulate what GetParentObjectReferenced
    // does later, thus allowing simple logic on when/how to release the
    // reference on exit.
    //
    Object->ADDREF(pTag);
 
    do {
        //
        // If successful, Callbacks will be != NULL
        //
        if (NT_SUCCESS(Object->QueryInterface(&cbParams))) {
            ASSERT(*Callbacks != NULL);
            //
            // Release the reference previously taken by the top of the function
            // or GetParentObjectReferenced in a previous pass in the loop.
            //
            Object->RELEASE(pTag);
            return pDeviceBase;
        }
 
        pParent = Object->GetParentObjectReferenced(pTag);
 
        //
        // Release the reference previously taken by the top of the function
        // or GetParentObjectReferenced in a previous pass in the loop.
        //
        Object->RELEASE(pTag);
 
        Object = pParent;
    } while (Object != NULL);
 
    ASSERT(Object == NULL);
 
    //
    // Queue presented requests do not have parents (to increase performance).
    // Try to find the callback interface on this object's device base.
    //
    if (NT_SUCCESS(pDeviceBase->QueryInterface(&cbParams))) {
        ASSERT(*Callbacks != NULL);
        //
        // Success, we got a callback interface.
        //
        return pDeviceBase;
    }
 
    DoTraceLevelMessage(
        pOrigParent->GetDriverGlobals(), TRACE_LEVEL_ERROR, TRACINGOBJECT,
        "WDFHANDLE %p does not have a callbacks interface in its object tree"
        "(WDFDEVICE %p)", pOrigParent->GetObjectHandle(),
        pDeviceBase->GetHandle());
 
    return pDeviceBase;
}
 
FxDeviceBase*
FxDeviceBase::_SearchForDevice(
    __in PFX_DRIVER_GLOBALS FxDriverGlobals,
    __in_opt PWDF_OBJECT_ATTRIBUTES Attributes
    )
{
    FxObject* pParentObject;
    FxDeviceBase* pDeviceBase;
 
    if (Attributes == NULL || Attributes->ParentObject == NULL) {
        return NULL;
    }
 
    FxObjectHandleGetPtr(FxDriverGlobals,
                         Attributes->ParentObject,
                         FX_TYPE_OBJECT,
                         (PVOID*) &pParentObject);
 
    pDeviceBase = _SearchForDevice(pParentObject, NULL);
 
    return pDeviceBase;
}
 
_Must_inspect_result_
NTSTATUS
FxDeviceBase::AllocateTarget(
    _Out_ FxIoTarget** Target,
    _In_  BOOLEAN SelfTarget
    )
/*++
 
Routine Description:
 
    Allocates an IO Target or an Self IO target for the FxDevice.
 
Arguments:
 
    Target - Out - returns the pointer to the allocated IO target.
 
    SelfTarget - If TRUE allocates an Self IO Target, if FALSE allocates
        a regular IO target.
 
Returns:
 
    NTSTATUS
 
--*/
{
    FxIoTarget* pTarget;
    NTSTATUS status;
 
    if (SelfTarget) {
        pTarget = (FxIoTarget*) new(GetDriverGlobals(), WDF_NO_OBJECT_ATTRIBUTES)
            FxIoTargetSelf(GetDriverGlobals(), sizeof(FxIoTargetSelf));
    } else {
        pTarget = new(GetDriverGlobals(), WDF_NO_OBJECT_ATTRIBUTES)
            FxIoTarget(GetDriverGlobals(), sizeof(FxIoTarget));
    }
 
    if (pTarget == NULL) {
        status = STATUS_INSUFFICIENT_RESOURCES;
 
        DoTraceLevelMessage(
            GetDriverGlobals(), TRACE_LEVEL_ERROR, TRACINGDEVICE,
            "WDFDEVICE %p could not allocate a WDFIOTARGET, %!STATUS!",
            GetHandle(), status);
 
        goto Done;
    }
 
    status = AddIoTarget(pTarget);
    if (!NT_SUCCESS(status)) {
        DoTraceLevelMessage(
            GetDriverGlobals(), TRACE_LEVEL_ERROR, TRACINGDEVICE,
            "WDFDEVICE %p failed to initialize (add) a WDFIOTARGET, %!STATUS!",
            GetHandle(), status);
 
        goto Done;
    }
 
    status = pTarget->Init(this);
    if (!NT_SUCCESS(status)) {
        DoTraceLevelMessage(
            GetDriverGlobals(), TRACE_LEVEL_ERROR, TRACINGDEVICE,
            "WDFDEVICE %p failed to initialize a WDFIOTARGET, %!STATUS!",
            GetHandle(), status);
 
        goto Done;
    }
 
    status = pTarget->Commit(WDF_NO_OBJECT_ATTRIBUTES, NULL, this);
    if (!NT_SUCCESS(status)) {
        DoTraceLevelMessage(
            GetDriverGlobals(), TRACE_LEVEL_ERROR, TRACINGDEVICE,
            "WDFDEVICE %p failed to initialize (commit) a WDFIOTARGET, %!STATUS!",
            GetHandle(), status);
 
        goto Done;
    }
 
    status = STATUS_SUCCESS;
 
Done:
    if (!NT_SUCCESS(status)) {
        if (pTarget != NULL) {
            pTarget->DeleteFromFailedCreate();
            pTarget = NULL;
        }
    }
 
    *Target = pTarget;
 
    return status;
}