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MdeModulePkg/PciBus: Restrict one VGA per HostBridge not Segment

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REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1109

Today's restriction of VGA device is to have only one VGA device
enabled per PCI segment. It's not correct because several segments
may share one IO / MMIO address space.
We should restrict to have one VGA per Host Bridge because each
Host Bridge has its only IO / MMIO address space.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
This commit is contained in:
Ruiyu Ni
2018-08-23 10:50:16 +08:00
parent 06da1e310b
commit 983f5abb9a
3 changed files with 20 additions and 20 deletions
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10
MdeModulePkg/Bus/Pci/PciBusDxe/PciDeviceSupport.h
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@@ -230,16 +230,16 @@ PciDeviceExisted (
);
/**
Get the active VGA device on the same segment.
Get the active VGA device on the specified Host Bridge.
@param VgaDevice PCI IO instance for the VGA device.
@param HostBridgeHandle Host Bridge handle.
@return The active VGA device on the same segment.
@return The active VGA device on the specified Host Bridge.
**/
PCI_IO_DEVICE *
ActiveVGADeviceOnTheSameSegment (
IN PCI_IO_DEVICE *VgaDevice
LocateVgaDeviceOnHostBridge (
IN EFI_HANDLE HostBridgeHandle
);
/**