WDDM 获取配置信息

使用DxgkDdiQueryAdapterInfo获取配置信息。

    InitialData.DxgkDdiQueryAdapterInfo             = BddDdiQueryAdapterInfo;

配置信息的类型有以下几种,如驱动的特性，内存段的分配等。这里我们只关注驱动特性。

每一种的类型，都对应一个大大的结构体，获取的信息之多之复杂。

typedef enum _DXGK_QUERYADAPTERINFOTYPE {
  DXGKQAITYPE_UMDRIVERPRIVATE                   = 0,
  DXGKQAITYPE_DRIVERCAPS                        = 1,
  DXGKQAITYPE_QUERYSEGMENT                      = 2,
#if (DXGKDDI_INTERFACE_VERSION >= DXGKDDI_INTERFACE_VERSION_WIN7)
  DXGKQAITYPE_ALLOCATIONGROUP                   = 3,
  DXGKQAITYPE_QUERYSEGMENT2                     = 4,
#endif
#if (DXGKDDI_INTERFACE_VERSION >= DXGKDDI_INTERFACE_VERSION_WIN8)
  DXGKQAITYPE_QUERYSEGMENT3                     = 5,
  DXGKQAITYPE_NUMPOWERCOMPONENTS                = 6,
  DXGKQAITYPE_POWERCOMPONENTINFO                = 7,
  DXGKQAITYPE_PREFERREDGPUNODE                  = 8,
#endif
#if (DXGKDDI_INTERFACE_VERSION >= DXGKDDI_INTERFACE_VERSION_WDDM1_3)
  DXGKQAITYPE_POWERCOMPONENTPSTATEINFO          = 9,
  DXGKQAITYPE_HISTORYBUFFERPRECISION            = 10,
#endif
#if (DXGKDDI_INTERFACE_VERSION >= DXGKDDI_INTERFACE_VERSION_WDDM2_0)
  DXGKQAITYPE_QUERYSEGMENT4                     = 11,
  DXGKQAITYPE_SEGMENTMEMORYSTATE                = 12,
  DXGKQAITYPE_GPUMMUCAPS                        = 13,
  DXGKQAITYPE_PAGETABLELEVELDESC                = 14,
  DXGKQAITYPE_PHYSICALADAPTERCAPS               = 15,
  DXGKQAITYPE_DISPLAY_DRIVERCAPS_EXTENSION      = 16,
#endif
#if (DXGKDDI_INTERFACE_VERSION >= DXGKDDI_INTERFACE_VERSION_WDDM2_2)
  DXGKQAITYPE_INTEGRATED_DISPLAY_DESCRIPTOR     = 17,
  DXGKQAITYPE_UEFIFRAMEBUFFERRANGES             = 18,
  DXGKQAITYPE_QUERYCOLORIMETRYOVERRIDES         = 19
} DXGK_QUERYADAPTERINFOTYPE;

对于DXGKQAITYPE_DRIVERCAPS时，对应的返回参数的结构体为DXGK_DRIVERCAPS，这里将大部分参数都置为0，只使用了少数的参数；

• 第一个参数WDDMVersion设置WDDM的版本，这里为1.2.
• 高端物理内存地址HighestAcceptableAddress，置为-1即0xfffffffffffffff.
• SupportNonVGA置为TRUE,支持使用DxgkDdiStopDeviceAndReleasePostDisplayOwnership函数重置显示设备并释放当前开机自检（POST）设备的所有权。
• SupportSmoothRotation :支持使用dxgkdidUpdateActivevidpnPresentPath函数更新适配器上的路径旋转，而不需要创建和设置新的VidPN。

代码如下：

NTSTATUS BASIC_DISPLAY_DRIVER::QueryAdapterInfo(_In_ CONST DXGKARG_QUERYADAPTERINFO* pQueryAdapterInfo)
{
    PAGED_CODE();

    BDD_ASSERT(pQueryAdapterInfo != NULL);

    switch (pQueryAdapterInfo->Type)
    {
        case DXGKQAITYPE_DRIVERCAPS:
        {
            if (pQueryAdapterInfo->OutputDataSize < sizeof(DXGK_DRIVERCAPS))
            {
                BDD_LOG_ERROR2("pQueryAdapterInfo->OutputDataSize (0x%I64x) is smaller than sizeof(DXGK_DRIVERCAPS) (0x%I64x)", pQueryAdapterInfo->OutputDataSize, sizeof(DXGK_DRIVERCAPS));
                return STATUS_BUFFER_TOO_SMALL;
            }

            DXGK_DRIVERCAPS* pDriverCaps = (DXGK_DRIVERCAPS*)pQueryAdapterInfo->pOutputData;

            // Nearly all fields must be initialized to zero, so zero out to start and then change those that are non-zero.
            // Fields are zero since BDD is Display-Only and therefore does not support any of the render related fields.
            // It also doesn't support hardware interrupts, gamma ramps, etc.
            RtlZeroMemory(pDriverCaps, sizeof(DXGK_DRIVERCAPS));

            pDriverCaps->WDDMVersion = DXGKDDI_WDDMv1_2;
            pDriverCaps->HighestAcceptableAddress.QuadPart = -1;

            pDriverCaps->SupportNonVGA = TRUE;
            pDriverCaps->SupportSmoothRotation = TRUE;

            return STATUS_SUCCESS;
        }

        default:
        {
            // BDD does not need to support any other adapter information types
            BDD_LOG_WARNING1("Unknown QueryAdapterInfo Type (0x%I64x) requested", pQueryAdapterInfo->Type);
            return STATUS_NOT_SUPPORTED;
        }
    }
}