NTSTATUS status = STATUS_UNSUCCESSFUL; devExt = PLxGetDeviceContext(WdfIoQueueGetDevice(Queue)); status = WdfDmaTransactionInitializeUsingRequest(devExt->ReadDmaTransaction. The driver uses the DMA enabler object (that is, WDFDMAENABLER) to communicate with the framework about DMA transfers for a specific device object. When the display port driver of the DirectX graphics kernel subsystem (Dxgkrnl.sys) calls the DxgkDdiCreateContext function, it sets the pCreateContext->Flags->GdiContext member to indicate the context that is used for GDI Hardware Acceleration. Master interrupt mask register failure. To implement the serialization, the driver should either dispatch all of the I/O requests that require DMA from the same sequential queue or implement manual dispatching and call the framework to get the next I/O request only after the previous request is complete. The only difference between the two methods is that WdfDmaTransactionDmaCompletedWithLength also takes an input parameter that supplies the number of bytes that the device transferred in the just-completed operation, which is useful for devices that report this information. DMA page register read/write failure. The driver can then complete the associated I/O request. The framework then allocates the necessary resources for the next transfer and calls the EvtProgramDma callback again to perform another transfer. Later, after the first transfer is complete and the driver calls WdfDmaTransactionDmaCompleted, typically from its EvtInterruptDpc function, the framework determines whether the entire transaction has been completed. The driver configures two sequential queues: one for read requests and the other for write requests. The method returns the number of bytes that have already been transferred for the transaction or, if no transfers have been performed yet, it returns zero. If the transfer completed successfully, the driver retrieves the number of bytes that the DMA transaction transferred by calling WdfDmaTransactionGetBytesTransferred. // release the DMA transaction object and complete the request. By default, the common buffer has the same alignment that was specified earlier in the call to WdfDeviceSetAlignmentRequirement. Allocates and initializes the necessary resources to perform the transfer. The length of the DMA transfer depends on whether the current I/O request can be satisfied with one transfer or whether, because of size constraints imposed by the device or constraints on the availability of mapping registers, the transaction must be divided into multiple transfers.
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