Re: Edk2 support MIPI SyS-T TraceHub Debug Library [TraceHubDebugLibSysT]

["Guo, Gua" <gua.guo@intel.com>]

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@Kinney, Michael D<mailto:michael.d.kinney@intel.com>

As we offline sync, there are below opens like below. Have any open, please also share for us.


  1.  Need to add TraceHub PCD into edk2/MdeModulePkg.uni at master * tianocore/edk2 * GitHub<https://github.com/tianocore/edk2/blob/master/MdeModulePkg/MdeModulePkg.uni>

Answer: Will update it in next patch

  1.  What about the license ?

Answer: It's BSD license, based on public-mipi-sys-t/LICENSE at master * MIPI-Alliance/public-mipi-sys-t (github.com)<https://github.com/MIPI-Alliance/public-mipi-sys-t/blob/master/LICENSE>

  1.  Is PcdTraceHubDebugAddress MMIO address ? If yes, why we use UINT32

Answer: It's MMIO address, we can change it to UINT64, it make sense to let the PCH more generic. Will update it in next patch.

  1.  For TraceHubWriteCataLog64_[0-6] try to use below macro to implement it.

#define VA_START va_start

#define VA_ARG   va_arg

#define VA_END   va_end

#define VA_LIST  va_list

Answer: Will update it in next patch

  1.  Is have SMM or MM version ?

Answer: MdeModulePkg/Library/TraceHubDebugLibSysT/DxeTraceHubDebugLibSyst.inf can take care for SMM case. We can rename it like below to make it more clearly.

MdeModulePkg/Library/TraceHubDebugLibSysT/DxeSmmTraceHubDebugLibSyst.inf

  1.  Whether have any chance to use .gitsubmodule to leverage https://github.com/MIPI-Alliance/public-mipi-sys-t.

Answer: Will draft another PR and try to use gitsubmodule to check whether exist any predicament.

Thanks
Gua

From: Guo, Gua
Sent: Wednesday, November 23, 2022 3:29 PM
To: Kinney, Michael D <michael.d.kinney@intel.com>; gaoliming <gaoliming@byosoft.com.cn>; devel@edk2.groups.io
Cc: Chan, Laura <laura.chan@intel.com>; Prakashan, Krishnadas Veliyathuparambil <krishnadas.veliyathuparambil.prakashan@intel.com>; K N, Karthik <karthik.k.n@intel.com>; Lu, James <james.lu@intel.com>; Chen, Arthur G <arthur.g.chen@intel.com>; Chiu, Chasel <chasel.chiu@intel.com>; Zimmer, Vincent <vincent.zimmer@intel.com>; Hsu, VictorX <victorx.hsu@intel.com>
Subject: Edk2 support MIPI SyS-T TraceHub Debug Library [TraceHubDebugLibSysT]


@Kinney, Michael D<mailto:michael.d.kinney@intel.com> and @gaoliming<mailto:gaoliming@byosoft.com.cn>

We want to add TraceHubDebug library support on Edk2. It's new added library on Edk2, so it doesn't have any backward and forward issue.

May I know have any process we may need to follow up. Have any comment or concern please also share for me.



Reviewers/Maintainers: @Prakashan, Krishnadas Veliyathuparambil<mailto:krishnadas.veliyathuparambil.prakashan@intel.com>, @Chan, Laura<mailto:laura.chan@intel.com>, @K N, Karthik<mailto:karthik.k.n@intel.com>.



USF UPL spec update: https://github.com/UniversalScalableFirmware/documentation/pull/52 (Done)

Edk2 Bugzilla: https://bugzilla.tianocore.org/show_bug.cgi?id=4144 (On-Going)

Edk2 PR: https://github.com/tianocore/edk2/pull/3613 (On-Going)



Background:

  *     Problem: In the UPL (Universal Payload) binary which contains only the Edk2 drivers, Tracehub debug message are missing during the execution of early DXE Core modules (before ReportStatusCode is ready).
  *     Solution: Add TraceHub lib on Edk2, to be consumed by the UPL.


About TraceHubDebugLibSysT:

  *   Library is consumed by the DebugLib and StatusCodeHandler to send the PostCodes, ProgressCodes and DEBUG messages to the TraceHub/NPK in MIPI SyS-T format.
  *   The MIPI SyS-T APIs in this library are taken from the OpenSource implementation: https://github.com/MIPI-Alliance/public-mipi-sys-t.
  *   Library changes done for upstreaming:  MipiSystLib is rewritten to comply EDK2 coding standards and changed ways to pass trace address/verbosity with HOB directly instead of calling into TraceHubHookLib to get these info.
  *   Proposal With UPL: consume HOB gUniversalPayloadTraceHubDebugInfoGuid to print TraceHub Debug message in DXE Core

Thanks,
Gua

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