Ming:
Just need to declare extern mRscHandlerProtocol in StatusCodeHandlerRuntimeDxe.h. It has been located in module entry point. So, I think it is simple.
Thanks
Liming
> -----邮件原件-----
> 发件人: Tan, Ming <ming.tan at intel.com>
> 发送时间: 2020年12月22日 8:56
> 收件人: gaoliming at byosoft.com.cn; Bi, Dandan <dandan.bi at intel.com>
> 抄送: devel at edk2.groups.io
> 主题: RE: [edk2-devel] [PATCH v6]
> MdeModulePkg/Universal/StatusCodeHandler: Fix a bug about log lost
>
> Liming:
> If remove the UnregisterSerialBootTimeHandlers(), then in
> SerialStatusCodeWorker.c, need use an external variable
> mRscHandlerProtocol which is defined in StatusCodeHandlerRuntimeDxe.c, or
> call gBS->LocateProtocol to get it again.
> Compare with export add an external variable, add an external function
> seems better.
>
> BR/Tan Ming.
>
> -----Original Message-----
> From: devel at edk2.groups.io <devel at edk2.groups.io> On Behalf Of gaoliming
> Sent: Tuesday, December 22, 2020 8:36 AM
> To: devel at edk2.groups.io; Tan, Ming <ming.tan at intel.com>; Bi, Dandan
> <dandan.bi at intel.com>
> Subject: 回复: [edk2-devel] [PATCH v6]
> MdeModulePkg/Universal/StatusCodeHandler: Fix a bug about log lost
>
> Ming:
> I have no concern for the updated patch.
>
> I just think we can simplify the code logic and remove the function
> UnregisterSerialBootTimeHandlers(). Unregister logic can be moved to
> SerialStatusCodeReportWorker().
>
> You can choose your preferred implementation. Reviewed-by: Liming Gao
> <gaoliming at byosoft.com.cn>
>
> Thanks
> Liming
> > -----邮件原件-----
> > 发件人: bounce+27952+69302+4905953+8761045 at groups.io
> > <bounce+27952+69302+4905953+8761045 at groups.io> 代表 Tan, Ming
> > 发送时间: 2020年12月21日 15:18
> > 收件人: Bi, Dandan <dandan.bi at intel.com>; Liming Gao
> > <gaoliming at byosoft.com.cn>
> > 抄送: devel at edk2.groups.io
> > 主题: Re: [edk2-devel] [PATCH v6]
> > MdeModulePkg/Universal/StatusCodeHandler: Fix a bug about log lost
> >
> > Liming:
> > I already submit a new patch for it, is there any new concern for it?
> >
> > Thank you.
> > Tan Ming.
> >
> > -----Original Message-----
> > From: devel at edk2.groups.io <devel at edk2.groups.io> On Behalf Of Tan,
> > Ming
> > Sent: Friday, December 18, 2020 12:51 PM
> > To: devel at edk2.groups.io
> > Cc: Bi, Dandan <dandan.bi at intel.com>; Liming Gao
> > <gaoliming at byosoft.com.cn>
> > Subject: [edk2-devel] [PATCH v6]
> > MdeModulePkg/Universal/StatusCodeHandler: Fix a bug about log lost
> >
> > REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3126
> >
> > 1. If use PeiDxeDebugLibReportStatusCode as DebugLib, then some logs
> > after
> > ExitBootService() will be lost.
> > 2. The root cause:
> > 2.1 The original code will register an unregister function of
> > gEfiEventExitBootServicesGuid, this unregister function will call
> > EFI_RSC_HANDLER_PROTOCOL->Unregister and does not support log
> through
> > serial port.
> > 2.2 And some other drivers also register call back funtions of
> > gEfiEventExitBootServicesGuid.
> > 2.3 Then after the unregister function is called, other call back
> functions can't
> > out log if them use RSC as DebugLib.
> > 3. The DxeMain will report status code
> EFI_SW_BS_PC_EXIT_BOOT_SERVICES
> > after notify all the call back functions of gEfiEventExitBootServicesGuid.
> > 4. Solution: the StatusCodeHandlerRuntimeDxe.c will not register an
> > unregister function of gEfiEventExitBootServicesGuid, but unregister
> > it
> after
> > receive the status code of EFI_SW_BS_PC_EXIT_BOOT_SERVICES.
> >
> > Cc: Dandan Bi <dandan.bi at intel.com>
> > Cc: Liming Gao <gaoliming at byosoft.com.cn>
> > Signed-off-by: Ming Tan <ming.tan at intel.com>
> > ---
> > V6: Change the funcname of UnregisterBootTimeHandlers to
> > UnregisterSerialBootTimeHandlers.
> > V5: Fix an unused var bug and compile error using GCC.
> > V4: Fix a spell bug in code comment, change 'a' to 'an' before
> 'unregister'.
> > V3: Fix a spell bug in commit message, change 'a' to 'an' before
> 'unregister'.
> > V2: Add the REF link in commit message.
> >
> > .../RuntimeDxe/SerialStatusCodeWorker.c | 10 ++++++++++
> > .../RuntimeDxe/StatusCodeHandlerRuntimeDxe.c | 19
> > ++----------------- .../RuntimeDxe/StatusCodeHandlerRuntimeDxe.h |
> > ++11
> > +++++++++++
> > 3 files changed, 23 insertions(+), 17 deletions(-)
> >
> > diff --git
> >
> a/MdeModulePkg/Universal/StatusCodeHandler/RuntimeDxe/SerialStatusCo
> > deWorker.c
> >
> b/MdeModulePkg/Universal/StatusCodeHandler/RuntimeDxe/SerialStatusCo
> > deWorker.c
> > index 0b98e7ec63..348f55edba 100644
> > ---
> >
> a/MdeModulePkg/Universal/StatusCodeHandler/RuntimeDxe/SerialStatusCo
> > deWorker.c
> > +++
> >
> b/MdeModulePkg/Universal/StatusCodeHandler/RuntimeDxe/SerialStatusCo
> > +++ deWorker.c
> > @@ -151,6 +151,16 @@ SerialStatusCodeReportWorker (
> > // SerialPortWrite ((UINT8 *) Buffer, CharCount); + //+ // If
> register
> > an unregister function of gEfiEventExitBootServicesGuid,+ // then
> > some
> log
> > called in ExitBootServices() will be lost,+ // so unregister the
> > handler
> after
> > receive the value of exit boot service.+ //+ if ((CodeType &
> > EFI_STATUS_CODE_TYPE_MASK) == EFI_PROGRESS_CODE &&+
> Value
> > == (EFI_SOFTWARE_EFI_BOOT_SERVICE |
> > EFI_SW_BS_PC_EXIT_BOOT_SERVICES)) {+
> > UnregisterSerialBootTimeHandlers();+ }+ return EFI_SUCCESS; } diff
> --git
> >
> a/MdeModulePkg/Universal/StatusCodeHandler/RuntimeDxe/StatusCodeHa
> > ndlerRuntimeDxe.c
> >
> b/MdeModulePkg/Universal/StatusCodeHandler/RuntimeDxe/StatusCodeHa
> > ndlerRuntimeDxe.c
> > index a8c0fe5b71..d50335af8a 100644
> > ---
> >
> a/MdeModulePkg/Universal/StatusCodeHandler/RuntimeDxe/StatusCodeHa
> > ndlerRuntimeDxe.c
> > +++
> >
> b/MdeModulePkg/Universal/StatusCodeHandler/RuntimeDxe/StatusCodeHa
> > nd
> > +++ lerRuntimeDxe.c
> > @@ -10,23 +10,17 @@
> > #include "StatusCodeHandlerRuntimeDxe.h" EFI_EVENT
> > mVirtualAddressChangeEvent = NULL;-static EFI_EVENT
> > mExitBootServicesEvent = NULL; EFI_RSC_HANDLER_PROTOCOL
> > *mRscHandlerProtocol = NULL; /** Unregister status code
> > callback functions only available at boot time from report status code
> > router when exiting boot services. - @param Event Event
> > whose notification function is being invoked.- @param Context
> > Pointer to the notification function's context, which is- always zero
> > in current implementation.- **/ VOID
> > EFIAPI-UnregisterBootTimeHandlers (- IN EFI_EVENT Event,-
> IN
> > VOID *Context+UnregisterSerialBootTimeHandlers (+
> > VOID ) { if (PcdGetBool (PcdStatusCodeUseSerial)) {@@ -178,15
> +172,6
> > @@ StatusCodeHandlerRuntimeDxeEntry (
> > mRscHandlerProtocol->Register
> (RtMemoryStatusCodeReportWorker,
> > TPL_HIGH_LEVEL); } - Status = gBS->CreateEventEx (-
> > EVT_NOTIFY_SIGNAL,- TPL_NOTIFY,-
> > UnregisterBootTimeHandlers,- NULL,-
> > &gEfiEventExitBootServicesGuid,-
> > &mExitBootServicesEvent- );- Status =
> > gBS->CreateEventEx ( EVT_NOTIFY_SIGNAL,
> > TPL_NOTIFY,diff --git
> >
> a/MdeModulePkg/Universal/StatusCodeHandler/RuntimeDxe/StatusCodeHa
> > ndlerRuntimeDxe.h
> >
> b/MdeModulePkg/Universal/StatusCodeHandler/RuntimeDxe/StatusCodeHa
> > ndlerRuntimeDxe.h
> > index fd4689c2d7..a2cf2ae0b7 100644
> > ---
> >
> a/MdeModulePkg/Universal/StatusCodeHandler/RuntimeDxe/StatusCodeHa
> > ndlerRuntimeDxe.h
> > +++
> >
> b/MdeModulePkg/Universal/StatusCodeHandler/RuntimeDxe/StatusCodeHa
> > nd
> > +++ lerRuntimeDxe.h
> > @@ -118,4 +118,15 @@ RtMemoryStatusCodeReportWorker (
> > IN EFI_STATUS_CODE_DATA *Data OPTIONAL );
> > +/**+ Unregister status code callback functions only available at
> > +boot
> time
> > from+ report status code router when exiting boot
> > services.++**/+VOID+EFIAPI+UnregisterSerialBootTimeHandlers (+
> > VOID+ );+ #endif--
> > 2.24.0.windows.2
> >
> >
> >
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> >
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