PFND3DDDI_RESERVEGPUVIRTUALADDRESSCB callback function (d3dumddi.h)

The D3D runtime's pfnReserveGPUVirtualAddressCb callback reserves an address range in the current process GPU virtual address space. The address range is only reserved, there is no actual memory behind it.

Syntax

PFND3DDDI_RESERVEGPUVIRTUALADDRESSCB Pfnd3dddiReservegpuvirtualaddresscb;

HRESULT Pfnd3dddiReservegpuvirtualaddresscb(
  HANDLE hDevice,
  D3DDDI_RESERVEGPUVIRTUALADDRESS *unnamedParam2
)
{...}

Parameters

hDevice

[in] A handle to the display device.

unnamedParam2

[in/out] Pointer to a D3DDDI_RESERVEGPUVIRTUALADDRESS structure that describes the operation to perform.

Return value

If this callback function succeeds, it returns S_OK. Otherwise, it returns an HRESULT error code.

Remarks

The user mode driver (UMD) can choose the base GPU virtual address to use for the reservation by specifying a non-NULL value for BaseAddress. The video memory manager (VidMm) will use the specified range if it's available. If the range intersects with an existing range, the operation fails. UMD can pass a NULL BaseAddress to let VidMm pick a base address.

When UMD chooses to let VidMm pick a base address for the GPU virtual address range, UMD can choose to constrain the range that VidMm should consider by specifying non-NULL values for MinimumAddress and MaximumAddress. VidMm will ensure that the allocated GPU virtual address range is entirely contained in the range. UMD can specify only a MinimumAddress, where MaximumAddress is assumed to be the end of the address space. Or UMD can specify only a MaximumAddress, where MinimumAddress is assumed to be 0.

When UMD calls pfnReserveGpuVertualAddrsesCb with hAdapter set to 0, the D3D runtime will set hAdapter to the kernel's D3DKMT_HANDLE before calling the D3DKMTReserveGpuVirtualAddress kernel interface.

Requirements

See also

D3DDDI_RESERVEGPUVIRTUALADDRESS