VideoPortCompleteDma - NtDoc
Native API online documentation, based on the System Informer
(formerly Process Hacker) phnt
headers
// video.h
VIDEOPORT_DEPRECATED VIDEOPORT_API VP_STATUS VideoPortCompleteDma(
[in] IN PVOID HwDeviceExtension,
[in] IN PVP_DMA_ADAPTER VpDmaAdapter,
[in] IN PVP_SCATTER_GATHER_LIST VpScatterGather,
[in] IN BOOLEAN WriteToDevice
);
View the official Windows Driver Kit DDI referenceNo description available.
The VideoPortCompleteDma function flushes any data remaining in a bus-master adapter's internal cache at the end of a DMA transfer operation, and then frees the previously allocated map registers and scatter/gather list used in scatter/gather DMA operations.
HwDeviceExtension [in]Pointer to the miniport driver's device extension.
VpDmaAdapter [in]Pointer to a VP_DMA_ADAPTER structure that represents the bus-master adapter. This structure was returned by a call to VideoPortGetDmaAdapter.
VpScatterGather [in]Pointer to the VP_SCATTER_GATHER_LIST structure previously passed to the miniport driver callback routine, HwVidExecuteDma.
WriteToDevice [in]Specifies the direction of the DMA transfer. A value of TRUE denotes a transfer from the buffer to the device, and a value of FALSE denotes a transfer from the device to the buffer.
VideoPortCompleteDma returns NO_ERROR.
The video miniport driver should call VideoPortCompleteDma immediately to free up system resources after a DMA transfer has been completed.
It is important to note that the scatter/gather list built by VideoPortStartDma becomes invalid when VideoPortCompleteDma is called..