[RFC v4 0/3] Add translation support to generic PciHostBridge

[Heyi Guo <heyi.guo@linaro.org>]

Please note: this is still *RFC* version, so we have not gone thru all the code
in EDK2 for applying the change of PciSegmentLib definition.

v4:
- Modify the code according to the comments from Ray, Laszlo and Ard (Please see
  the notes of Patch 1/3)
- Ignore translation of bus in CreateRootBridge.


v3:
- Keep definition of Translation consistent in EDKII code: Translation = device
  address - host address.
- Patch 2/2 is split into 2 patches (2/3 and 3/3).
- Refine comments and commit messages to make the code easier to understand.


v2:
Changs are made according to the discussion on the mailing list, including:

- PciRootBridgeIo->Configuration should return CPU view address, as well as
  PciIo->GetBarAttributes, and Translation Offset should be equal to PCI view
  address - CPU view address.
- Add translation offset to PCI_ROOT_BRIDGE_APERTURE structure definition.
- PciHostBridge driver internally used Base Address is still based on PCI view
  address, and translation offset = CPU view - PCI view, which follows the
  definition in ACPI, and not the same as that in UEFI spec.

Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Star Zeng <star.zeng@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>

Heyi Guo (3):
  MdeModulePkg/PciHostBridgeDxe: Add support for address translation
  MdeModulePkg/PciBus: convert host address to device address
  MdeModulePkg/PciBus: return CPU address for GetBarAttributes

 MdeModulePkg/Bus/Pci/PciHostBridgeDxe/PciHostResource.h |   2 +
 MdeModulePkg/Include/Library/PciHostBridgeLib.h         |  14 +++
 MdeModulePkg/Bus/Pci/PciBusDxe/PciIo.c                  |  12 +-
 MdeModulePkg/Bus/Pci/PciHostBridgeDxe/PciHostBridge.c   |  85 +++++++++++---
 MdeModulePkg/Bus/Pci/PciHostBridgeDxe/PciRootBridgeIo.c | 122 +++++++++++++++++---
 5 files changed, 204 insertions(+), 31 deletions(-)

-- 
2.7.4