[PATCH 0/2] MdeModulePkg/PciBus: Restrict one VGA per HostBridge not Segment

[Ruiyu Ni <ruiyu.ni@intel.com>]

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>
Cc: Star Zeng <star.zeng@intel.com>

Ruiyu Ni (2):
  MdeModulePkg/PciBus: Refine ActiveVGADeviceOnTheRootBridge
  MdeModulePkg/PciBus: Restrict one VGA per HostBridge not Segment

 MdeModulePkg/Bus/Pci/PciBusDxe/PciDeviceSupport.c | 55 +++++++++++------------
 MdeModulePkg/Bus/Pci/PciBusDxe/PciDeviceSupport.h | 20 ++++-----
 MdeModulePkg/Bus/Pci/PciBusDxe/PciIo.c            |  4 +-
 3 files changed, 38 insertions(+), 41 deletions(-)

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2.16.1.windows.1