Re: [PATCH v4 0/6] DxeBmDmaLib (BmDmaLib class) library

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

Leo,
I talked with Jiewen in office today. He felt that Intel might have a similar need of such layer of abstraction (BmDmaLib).
We are investigating it. Can you please wait for several days?
We'd like to review the current interfaces of BmDmaLib to make sure it's general enough to meet any potential needs.
Sorry about the delay.

Regards,
Ray

>-----Original Message-----
>From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf Of Leo Duran
>Sent: Friday, March 3, 2017 2:47 AM
>To: edk2-devel@ml01.01.org
>Cc: Leo Duran <leo.duran@amd.com>
>Subject: [edk2] [PATCH v4 0/6] DxeBmDmaLib (BmDmaLib class) library
>
>This series provides an abstraction layer for Bus-master DMA operations as
>currently implemented by the PciHostBridgeDxe driver. The intent is to then
>allow override of this library as may be required by specific hardware
>implementations, such as AMD's Secure Encrypted Virtualization (SEV).
>
>Please refer to the RFC discussion for SEV here:
>http://marc.info/?l=linux-mm&m=147190814023863&w=2
>
>This new BmDmaLib class library is cloned from the existing DmaLib with
>an additional DmaAbove4GB (BOOLEAN) parameter for the Map and Allocate
>interfaces, so that decisions can be made about the need to allocate DMA
>buffers below the 4GB boundary.
>
>NOTE: The abstraction layer is intended for Bus-master (DMA capable)
>devices, and not restricted to the PCI Root-Bridge use-case. Thus the
>rationale for not using EFI_PCI_ROOT_BRIDGE_IO_PROTOCOL_OPERATION types.
>
>Changes since v3:
>- Add copyright notice on changed files.
>- Re-order parameters on BmDmaFreeBuffer(), consistent with gBS->FreePages().
>
>Leo Duran (6):
>  MdeModulePkg: Add DxeBmDmaLib (BmDmaLib class) library
>  ArmVirtPkg: Resolve BmDmaLib class for PciHostBridgeDxe driver
>  CorebootPayloadPkg: Resolve BmDmaLib class for PciHostBridgeDxe driver
>  MdeModulePkg: Resolve BmDmaLib class for PciHostBridgeDxe driver
>  OvmfPkg: Resolve BmDmaLib class for PciHostBridgeDxe driver
>  MdeModulePkg: Modify PciHostBridgeDxe to use new BmDmaLib class
>    library
>
> ArmVirtPkg/ArmVirtQemu.dsc                         |   2 +
> ArmVirtPkg/ArmVirtQemuKernel.dsc                   |   2 +
> CorebootPayloadPkg/CorebootPayloadPkgIa32.dsc      |   3 +
> CorebootPayloadPkg/CorebootPayloadPkgIa32X64.dsc   |   3 +
> .../Bus/Pci/PciHostBridgeDxe/PciHostBridgeDxe.inf  |   1 +
> .../Bus/Pci/PciHostBridgeDxe/PciRootBridge.h       |  15 +-
> .../Bus/Pci/PciHostBridgeDxe/PciRootBridgeIo.c     | 274 ++++------------
> MdeModulePkg/Include/Library/BmDmaLib.h            | 161 ++++++++++
> MdeModulePkg/Library/DxeBmDmaLib/DxeBmDmaLib.c     | 351 +++++++++++++++++++++
> MdeModulePkg/Library/DxeBmDmaLib/DxeBmDmaLib.inf   |  41 +++
> MdeModulePkg/MdeModulePkg.dsc                      |   3 +
> OvmfPkg/OvmfPkgIa32.dsc                            |   2 +
> OvmfPkg/OvmfPkgIa32X64.dsc                         |   2 +
> OvmfPkg/OvmfPkgX64.dsc                             |   2 +
> 14 files changed, 642 insertions(+), 220 deletions(-)
> create mode 100644 MdeModulePkg/Include/Library/BmDmaLib.h
> create mode 100644 MdeModulePkg/Library/DxeBmDmaLib/DxeBmDmaLib.c
> create mode 100644 MdeModulePkg/Library/DxeBmDmaLib/DxeBmDmaLib.inf
>
>--
>2.7.4
>
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