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qxl-wddm-dod: Startup case when OS does not supply frame buffer address

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https://bugzilla.redhat.com/show_bug.cgi?id=1417448
When the OS does not provide physical address of the frame buffer,
the driver retrieves it from allocated PCI resource for BAR0.
https://msdn.microsoft.com/en-us/library/hh451339(v=vs.85).aspx
In DxgkCbAcquirePostDisplayOwnership OS not always fills
the DXGK_DISPLAY_INFORMATION structure with valid data.

Signed-off-by: Yuri Benditovich <yuri.benditovich@daynix.com>
Acked-by: Frediano Ziglio <fziglio@redhat.com>
This commit is contained in:
yuri.benditovich@daynix.com 2017-02-07 00:29:20 +02:00 committed by Frediano Ziglio
parent 12efc9b81b
commit 9ae81b279d
1 changed files with 27 additions and 0 deletions
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27
qxldod/QxlDod.cpp
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@ -2534,6 +2534,26 @@ NTSTATUS VgaDevice::GetCurrentMode(ULONG* pMode)
return Status;
}
static LONGLONG GetVgaFrameBuffer(const CM_RESOURCE_LIST& resList)
{
PAGED_CODE();
for (ULONG i = 0; i < resList.Count; ++i)
{
const CM_PARTIAL_RESOURCE_DESCRIPTOR *prd = resList.List[i].PartialResourceList.PartialDescriptors;
for (ULONG j = 0; j < resList.List[i].PartialResourceList.Count; ++j)
{
if (prd[j].Type == CmResourceTypeMemory)
{
// bar 0 is VGA area
DbgPrint(TRACE_LEVEL_INFORMATION, ("%s: found %I64x\n", __FUNCTION__, prd[j].u.Memory.Start.QuadPart));
return prd[j].u.Memory.Start.QuadPart;
}
}
}
DbgPrint(TRACE_LEVEL_ERROR, ("%s: not found in resources\n", __FUNCTION__));
return 0;
}
NTSTATUS VgaDevice::HWInit(PCM_RESOURCE_LIST pResList, DXGK_DISPLAY_INFORMATION* pDispInfo)
{
PAGED_CODE();
@ -2541,6 +2561,13 @@ NTSTATUS VgaDevice::HWInit(PCM_RESOURCE_LIST pResList, DXGK_DISPLAY_INFORMATION*
DbgPrint(TRACE_LEVEL_VERBOSE, ("---> %s\n", __FUNCTION__));
UNREFERENCED_PARAMETER(pResList);
AcquireDisplayInfo(*(pDispInfo));
// it is possible that the OS does not have current display information
// in this case the driver uses defaults, but physical address
// is still not initialized
if (!pDispInfo->PhysicAddress.QuadPart)
{
pDispInfo->PhysicAddress.QuadPart = GetVgaFrameBuffer(*pResList);
}
DbgPrint(TRACE_LEVEL_VERBOSE, ("<--- %s\n", __FUNCTION__));
return GetModeList(pDispInfo);
}