WdfDmaEnablerGetMaximumLength function (wdfdmaenabler.h)
[Applies to KMDF only]
The WdfDmaEnablerGetMaximumLength method returns the maximum transfer length, for a single DMA transfer, that a device supports.
Syntax
size_t WdfDmaEnablerGetMaximumLength(
[in] WDFDMAENABLER DmaEnabler
);
Parameters
[in] DmaEnabler
A handle to a DMA enabler object that the driver obtained from a previous call to WdfDmaEnablerCreate.
Return value
WdfDmaEnablerGetMaximumLength returns the maximum length of a DMA transfer, in bytes. This length is the same value that was specified in a previous call to WdfDmaEnablerCreate.
A bug check occurs if the driver supplies an invalid object handle.
Requirements
| Requirement | Value |
|---|---|
| Target Platform | Universal |
| Minimum KMDF version | 1.0 |
| Header | wdfdmaenabler.h (include Wdf.h) |
| Library | Wdf01000.sys (see Framework Library Versioning.) |
| IRQL | <=DISPATCH_LEVEL |
| DDI compliance rules | DriverCreate(kmdf), KmdfIrql(kmdf), KmdfIrql2(kmdf), KmdfIrqlExplicit(kmdf) |