Re: [Patch V2 2/2] UefiCpuPkg: Update PT code to support enable collect performance

["duntan" <dun.tan@intel.com>]

Thanks for the comments. I'll update the code in next version patch.

Thanks,
Dun

-----Original Message-----
From: Ni, Ray <ray.ni@intel.com> 
Sent: Tuesday, April 25, 2023 10:14 PM
To: Tan, Dun <dun.tan@intel.com>; devel@edk2.groups.io
Cc: Dong, Eric <eric.dong@intel.com>; Kumar, Rahul R <rahul.r.kumar@intel.com>; Gerd Hoffmann <kraxel@redhat.com>; Chen, Xiao X <xiao.x.chen@intel.com>
Subject: RE: [Patch V2 2/2] UefiCpuPkg: Update PT code to support enable collect performance

> @@ -112,6 +115,7 @@ ProcTraceSupport (
>    PROC_TRACE_DATA                              *ProcTraceData;
>    CPUID_STRUCTURED_EXTENDED_FEATURE_FLAGS_EBX  Ebx;
>    CPUID_INTEL_PROCESSOR_TRACE_MAIN_LEAF_ECX    Ecx;
> +  CPUID_INTEL_PROCESSOR_TRACE_MAIN_LEAF_EBX    MainLeafEbx;

1. can you update the "Ecx" to "ProcTraceEcx", and "MainLeafEbx" to "ProcTraceEbx"?

> 
>    //
>    // Check if ProcTraceMemorySize option is enabled (0xFF means 
> disable by
> user)
> @@ -141,6 +145,12 @@ ProcTraceSupport (
>      ProcTraceData->ProcessorData[ProcessorNumber].RtitCtrl.Uint64           =
> AsmReadMsr64 (MSR_IA32_RTIT_CTL);
>      
> ProcTraceData->ProcessorData[ProcessorNumber].RtitOutputBase.Uint64
> = AsmReadMsr64 (MSR_IA32_RTIT_OUTPUT_BASE);
>      ProcTraceData-
> >ProcessorData[ProcessorNumber].RtitOutputMaskPtrs.Uint64 =
> AsmReadMsr64 (MSR_IA32_RTIT_OUTPUT_MASK_PTRS);
> +
> +    if (ProcTraceData->EnablePerformanceCollecting) {
> +      AsmCpuidEx (CPUID_INTEL_PROCESSOR_TRACE,
> CPUID_INTEL_PROCESSOR_TRACE_MAIN_LEAF, NULL, &MainLeafEbx.Uint32, 
> NULL, NULL);

2. There is an existing Cpuid call earlier. Can you get the "EBX" value in the existing
     Cpuid call? And you don't even need to check "EnablePerformanceCollecting" here
     for the capability detection.