DXGK_ALLOCATIONLIST structure (d3dkmddi.h)
The DXGK_ALLOCATIONLIST structure describes an allocation specification that is used in direct memory access (DMA) buffering.
Syntax
typedef struct _DXGK_ALLOCATIONLIST
{
HANDLE hDeviceSpecificAllocation;
struct
{
UINT WriteOperation : 1; // 0x00000001
UINT SegmentId : 5; // 0x0000002E
UINT Reserved : 26; // 0xFFFFFFC0
};
#if (DXGKDDI_INTERFACE_VERSION >= DXGKDDI_INTERFACE_VERSION_WDDM2_0)
union
{
PHYSICAL_ADDRESS PhysicalAddress;
D3DGPU_VIRTUAL_ADDRESS VirtualAddress;
};
#else // (DXGKDDI_INTERFACE_VERSION < DXGKDDI_INTERFACE_VERSION_WDDM2_0)
PHYSICAL_ADDRESS PhysicalAddress;
#endif // (DXGKDDI_INTERFACE_VERSION >= DXGKDDI_INTERFACE_VERSION_WDDM2_0)
} DXGK_ALLOCATIONLIST;
Members
[in/out] hDeviceSpecificAllocation
An open handle to the allocation that is being referenced (that is, the handle that the driver returned in the hDeviceSpecificAllocation member of the DXGK_OPENALLOCATIONINFO structure for the allocation in a call to the driver's DxgkDdiOpenAllocation function).
[in/out] WriteOperation
Identifies whether the allocation can be written to. Setting this member to 1 indicates that the allocation can be written to anywhere in the DMA buffer. Setting this member is equivalent to setting the first bit of a 32-bit value (0x00000001).
[in/out] SegmentId
Specifies the identifier of a segment that the allocation was last paged in at. Setting this member to 0 indicates that no pre-patching information is available. Setting this member is equivalent to setting the second through sixth bit of a 32-bit value (0x0000002E).
[in] Reserved
Reserved. This member should be set to 0. Setting this member is equivalent to setting the remaining 26 bits (0xFFFFFFC0) of a 32-bit value to zeros.
[in/out] PhysicalAddress
A PHYSICAL_ADDRESS data type (which is defined as LARGE_INTEGER) that indicates the physical address, within the segment that SegmentId specifies, where the allocation was last paged-in at. This member is set to zero if no pre-patching information is available.
Supported starting with Windows 10.
[in/out] VirtualAddress
A D3DGPU_VIRTUAL_ADDRESS data type (which is defined as a ULONGLONG) that indicates the virtual address.
Supported starting with Windows 10.
Remarks
In the display miniport driver's DxgkDdiRender function, the driver generates a list of DXGK_ALLOCATIONLIST structures for allocation specifications that will be used in a direct memory access (DMA) buffer. The video memory manager uses the list to split and patch DMA buffers appropriately.
Requirements
| Minimum supported client | Windows Vista |
| Header | d3dkmddi.h (include D3dkmddi.h) |
See also
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