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REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1274 In current code, EhcMonitorAsyncRequests (timer handler) will do unmap and map operations for AsyncIntTransfers to "Flush data from PCI controller specific address to mapped system memory address". EhcMonitorAsyncRequests EhcFlushAsyncIntMap PciIo->Unmap IoMmu->SetAttribute PciIo->Map IoMmu->SetAttribute This may impact the boot performance. Since the data buffer for EhcMonitorAsyncRequests is internal buffer, we can allocate common buffer by PciIo->AllocateBuffer and map the buffer with EfiPciIoOperationBusMasterCommonBuffer, then the unmap and map operations can be removed. /// /// Provides both read and write access to system memory by /// both the processor and a bus master. The buffer is coherent /// from both the processor's and the bus master's point of view. /// EfiPciIoOperationBusMasterCommonBuffer, Test done: USB KB works normally. USB disk read/write works normally. Cc: Ruiyu Ni <ruiyu.ni@intel.com> Cc: Hao Wu <hao.a.wu@intel.com> Cc: Jian J Wang <jian.j.wang@intel.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Star Zeng <star.zeng@intel.com> Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com> Reviewed-by: Hao Wu <hao.a.wu@intel.com>
EDK II Project
A modern, feature-rich, cross-platform firmware development environment for the UEFI and PI specifications from www.uefi.org.
Contributions to the EDK II open source project are covered by the TianoCore Contribution Agreement 1.1
The majority of the content in the EDK II open source project uses a BSD 2-Clause License. The EDK II open source project contains the following components that are covered by additional licenses:
- AppPkg/Applications/Python/Python-2.7.2/Tools/pybench
- AppPkg/Applications/Python/Python-2.7.2
- AppPkg/Applications/Python/Python-2.7.10
- BaseTools/Source/C/BrotliCompress
- MdeModulePkg/Library/BrotliCustomDecompressLib
- OvmfPkg
- CryptoPkg/Library/OpensslLib/openssl
The EDK II Project is composed of packages. The maintainers for each package are listed in Maintainers.txt.