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system76-edk2/UefiCpuPkg/UefiCpuPkg.dsc
Jason Lou 19d5bccc76 UefiCpuPkg: Remove PEI/DXE instances of CpuTimerLib. 
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2832

1. Remove PEI instance(PeiCpuTimerLib).
PeiCpuTimerLib is currently designed to save time by getting CPU TSC
frequency from Hob. BaseCpuTimerLib is designed to calculate TSC frequency
by using CPUID[15h] each time.
The time it takes to find CpuCrystalFrequencyHob (about 2000ns) is much
longer than it takes to calculate TSC frequency with CPUID[15h] (about
450ns), which means using BaseCpuTimerLib to trigger a delay is more
accurate than using PeiCpuTimerLib, recommend to use BaseCpuTimerLib
instead of PeiCpuTimerLib.

2. Remove DXE instance(DxeCpuTimerLib).
DxeCpuTimerLib is designed to calculate TSC frequency with CPUID[15h] in
its constructor function, then save it in a global variable. For this
design, once the driver containing this instance is running, this
constructor function is called, it will take extra time to calculate TSC
frequency.
The time it takes to get TSC frequency from global variable is shorter
than it takes to calculate TSC frequency with CPUID[15h], but 450ns is a
short time, the impact on the platform is very limited.
In addition, in order to simplify the code, recommend to use
BaseCpuTimerLib instead of DxeCpuTimerLib.

I did some experiments on one server platform and collected following data:
1. Average time required to find CpuCrystalFrequencyHob: about 2000 ns.
2. Average time required to find the last Hob: about 2700 ns.
2. Average time required to calculate TSC frequency: about 450 ns.

Reference code:
    //
    // Calculate average time required to find Hob.
    //
    DEBUG((DEBUG_ERROR, "[PeiCpuTimerLib] GetPerformanceCounterFrequency - GetFirstGuidHob (1000 cycles)\n"));
    Ticks1 = AsmReadTsc();
    for (i = 0; i < 1000; i++) {
      GuidHob = GetFirstGuidHob (&mCpuCrystalFrequencyHobGuid);
    }
    Ticks2 = AsmReadTsc();

    if (GuidHob == NULL) {
      DEBUG((DEBUG_ERROR, "[PeiCpuTimerLib]  - CpuCrystalFrequencyHob can not be found!\n"));
    } else {
      DEBUG((DEBUG_ERROR, "[PeiCpuTimerLib]  - Average time required to find Hob = %d ns\n", \
          DivU64x32(DivU64x64Remainder(MultU64x32((Ticks2 - Ticks1), 1000000000), *CpuCrystalCounterFrequency, NULL), 1000)));
    }

    //
    // Calculate average time required to calculate CPU frequency.
    //
    DEBUG((DEBUG_ERROR, "[PeiCpuTimerLib] GetPerformanceCounterFrequency - CpuidCoreClockCalculateTscFrequency (1000 cycles)\n"));
    Ticks1 = AsmReadTsc();
    for (i = 0; i < 1000; i++) {
      Freq = CpuidCoreClockCalculateTscFrequency ();
    }
    Ticks2 = AsmReadTsc();
    DEBUG((DEBUG_ERROR, "[PeiCpuTimerLib]  - Average time required to calculate TSC frequency = %d ns\n", \
        DivU64x32(DivU64x64Remainder(MultU64x32((Ticks2 - Ticks1), 1000000000), *CpuCrystalCounterFrequency, NULL), 1000)));

Signed-off-by: Jason Lou <yun.lou@intel.com>
Reviewed-by: Ray Ni <ray.ni@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
2021-04-09 01:00:22 +00:00

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## @file
# UefiCpuPkg Package
#
# Copyright (c) 2007 - 2021, Intel Corporation. All rights reserved.<BR>
#
# SPDX-License-Identifier: BSD-2-Clause-Patent
#
##
[Defines]
PLATFORM_NAME = UefiCpu
PLATFORM_GUID = a1b7be22-78b3-4260-9569-8649e8c17d49
PLATFORM_VERSION = 0.90
DSC_SPECIFICATION = 0x00010005
OUTPUT_DIRECTORY = Build/UefiCpu
SUPPORTED_ARCHITECTURES = IA32|X64
BUILD_TARGETS = DEBUG|RELEASE|NOOPT
SKUID_IDENTIFIER = DEFAULT
#
# External libraries to build package
#
!include MdePkg/MdeLibs.dsc.inc
[LibraryClasses]
BaseLib|MdePkg/Library/BaseLib/BaseLib.inf
BaseMemoryLib|MdePkg/Library/BaseMemoryLib/BaseMemoryLib.inf
CpuLib|MdePkg/Library/BaseCpuLib/BaseCpuLib.inf
DebugLib|MdePkg/Library/BaseDebugLibNull/BaseDebugLibNull.inf
SerialPortLib|MdePkg/Library/BaseSerialPortLibNull/BaseSerialPortLibNull.inf
DebugPrintErrorLevelLib|MdePkg/Library/BaseDebugPrintErrorLevelLib/BaseDebugPrintErrorLevelLib.inf
DevicePathLib|MdePkg/Library/UefiDevicePathLib/UefiDevicePathLib.inf
UefiCpuLib|UefiCpuPkg/Library/BaseUefiCpuLib/BaseUefiCpuLib.inf
IoLib|MdePkg/Library/BaseIoLibIntrinsic/BaseIoLibIntrinsic.inf
MtrrLib|UefiCpuPkg/Library/MtrrLib/MtrrLib.inf
PcdLib|MdePkg/Library/BasePcdLibNull/BasePcdLibNull.inf
PrintLib|MdePkg/Library/BasePrintLib/BasePrintLib.inf
UefiLib|MdePkg/Library/UefiLib/UefiLib.inf
UefiRuntimeServicesTableLib|MdePkg/Library/UefiRuntimeServicesTableLib/UefiRuntimeServicesTableLib.inf
UefiBootServicesTableLib|MdePkg/Library/UefiBootServicesTableLib/UefiBootServicesTableLib.inf
UefiDriverEntryPoint|MdePkg/Library/UefiDriverEntryPoint/UefiDriverEntryPoint.inf
StandaloneMmDriverEntryPoint|MdePkg/Library/StandaloneMmDriverEntryPoint/StandaloneMmDriverEntryPoint.inf
DxeServicesTableLib|MdePkg/Library/DxeServicesTableLib/DxeServicesTableLib.inf
PeimEntryPoint|MdePkg/Library/PeimEntryPoint/PeimEntryPoint.inf
PeiServicesLib|MdePkg/Library/PeiServicesLib/PeiServicesLib.inf
PerformanceLib|MdePkg/Library/BasePerformanceLibNull/BasePerformanceLibNull.inf
TimerLib|MdePkg/Library/BaseTimerLibNullTemplate/BaseTimerLibNullTemplate.inf
DebugAgentLib|MdeModulePkg/Library/DebugAgentLibNull/DebugAgentLibNull.inf
LocalApicLib|UefiCpuPkg/Library/BaseXApicX2ApicLib/BaseXApicX2ApicLib.inf
ReportStatusCodeLib|MdePkg/Library/BaseReportStatusCodeLibNull/BaseReportStatusCodeLibNull.inf
SynchronizationLib|MdePkg/Library/BaseSynchronizationLib/BaseSynchronizationLib.inf
SmmMemLib|MdePkg/Library/SmmMemLib/SmmMemLib.inf
CacheMaintenanceLib|MdePkg/Library/BaseCacheMaintenanceLib/BaseCacheMaintenanceLib.inf
PciLib|MdePkg/Library/BasePciLibPciExpress/BasePciLibPciExpress.inf
PciExpressLib|MdePkg/Library/BasePciExpressLib/BasePciExpressLib.inf
SmmCpuPlatformHookLib|UefiCpuPkg/Library/SmmCpuPlatformHookLibNull/SmmCpuPlatformHookLibNull.inf
SmmCpuFeaturesLib|UefiCpuPkg/Library/SmmCpuFeaturesLib/SmmCpuFeaturesLib.inf
PeCoffGetEntryPointLib|MdePkg/Library/BasePeCoffGetEntryPointLib/BasePeCoffGetEntryPointLib.inf
PeCoffExtraActionLib|MdePkg/Library/BasePeCoffExtraActionLibNull/BasePeCoffExtraActionLibNull.inf
TpmMeasurementLib|MdeModulePkg/Library/TpmMeasurementLibNull/TpmMeasurementLibNull.inf
VmgExitLib|UefiCpuPkg/Library/VmgExitLibNull/VmgExitLibNull.inf
[LibraryClasses.common.SEC]
PlatformSecLib|UefiCpuPkg/Library/PlatformSecLibNull/PlatformSecLibNull.inf
!if $(TOOL_CHAIN_TAG) == "XCODE5"
CpuExceptionHandlerLib|UefiCpuPkg/Library/CpuExceptionHandlerLib/Xcode5SecPeiCpuExceptionHandlerLib.inf
!else
CpuExceptionHandlerLib|UefiCpuPkg/Library/CpuExceptionHandlerLib/SecPeiCpuExceptionHandlerLib.inf
!endif
HobLib|MdePkg/Library/PeiHobLib/PeiHobLib.inf
PeiServicesTablePointerLib|MdePkg/Library/PeiServicesTablePointerLibIdt/PeiServicesTablePointerLibIdt.inf
MemoryAllocationLib|MdePkg/Library/PeiMemoryAllocationLib/PeiMemoryAllocationLib.inf
[LibraryClasses.common.PEIM]
MemoryAllocationLib|MdePkg/Library/PeiMemoryAllocationLib/PeiMemoryAllocationLib.inf
HobLib|MdePkg/Library/PeiHobLib/PeiHobLib.inf
LockBoxLib|MdeModulePkg/Library/SmmLockBoxLib/SmmLockBoxPeiLib.inf
MpInitLib|UefiCpuPkg/Library/MpInitLib/PeiMpInitLib.inf
RegisterCpuFeaturesLib|UefiCpuPkg/Library/RegisterCpuFeaturesLib/PeiRegisterCpuFeaturesLib.inf
CpuCacheInfoLib|UefiCpuPkg/Library/CpuCacheInfoLib/PeiCpuCacheInfoLib.inf
[LibraryClasses.IA32.PEIM, LibraryClasses.X64.PEIM]
PeiServicesTablePointerLib|MdePkg/Library/PeiServicesTablePointerLibIdt/PeiServicesTablePointerLibIdt.inf
CpuExceptionHandlerLib|UefiCpuPkg/Library/CpuExceptionHandlerLib/PeiCpuExceptionHandlerLib.inf
[LibraryClasses.common.DXE_DRIVER]
MemoryAllocationLib|MdePkg/Library/UefiMemoryAllocationLib/UefiMemoryAllocationLib.inf
HobLib|MdePkg/Library/DxeHobLib/DxeHobLib.inf
CpuExceptionHandlerLib|UefiCpuPkg/Library/CpuExceptionHandlerLib/DxeCpuExceptionHandlerLib.inf
MpInitLib|UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf
RegisterCpuFeaturesLib|UefiCpuPkg/Library/RegisterCpuFeaturesLib/DxeRegisterCpuFeaturesLib.inf
CpuCacheInfoLib|UefiCpuPkg/Library/CpuCacheInfoLib/DxeCpuCacheInfoLib.inf
[LibraryClasses.common.DXE_SMM_DRIVER]
SmmServicesTableLib|MdePkg/Library/SmmServicesTableLib/SmmServicesTableLib.inf
MmServicesTableLib|MdePkg/Library/MmServicesTableLib/MmServicesTableLib.inf
MemoryAllocationLib|MdePkg/Library/SmmMemoryAllocationLib/SmmMemoryAllocationLib.inf
HobLib|MdePkg/Library/DxeHobLib/DxeHobLib.inf
CpuExceptionHandlerLib|UefiCpuPkg/Library/CpuExceptionHandlerLib/SmmCpuExceptionHandlerLib.inf
[LibraryClasses.common.MM_STANDALONE]
MmServicesTableLib|MdePkg/Library/StandaloneMmServicesTableLib/StandaloneMmServicesTableLib.inf
[LibraryClasses.common.UEFI_APPLICATION]
UefiApplicationEntryPoint|MdePkg/Library/UefiApplicationEntryPoint/UefiApplicationEntryPoint.inf
MemoryAllocationLib|MdePkg/Library/UefiMemoryAllocationLib/UefiMemoryAllocationLib.inf
#
# Drivers/Libraries within this package
#
[Components]
UefiCpuPkg/CpuIo2Dxe/CpuIo2Dxe.inf
UefiCpuPkg/CpuIoPei/CpuIoPei.inf
UefiCpuPkg/Library/SecPeiDxeTimerLibUefiCpu/SecPeiDxeTimerLibUefiCpu.inf
UefiCpuPkg/Application/Cpuid/Cpuid.inf
UefiCpuPkg/Library/CpuTimerLib/BaseCpuTimerLib.inf
UefiCpuPkg/Library/CpuCacheInfoLib/PeiCpuCacheInfoLib.inf
UefiCpuPkg/Library/CpuCacheInfoLib/DxeCpuCacheInfoLib.inf
[Components.IA32, Components.X64]
UefiCpuPkg/CpuDxe/CpuDxe.inf
UefiCpuPkg/CpuFeatures/CpuFeaturesPei.inf {
<LibraryClasses>
NULL|UefiCpuPkg/Library/CpuCommonFeaturesLib/CpuCommonFeaturesLib.inf
}
UefiCpuPkg/CpuFeatures/CpuFeaturesDxe.inf {
<LibraryClasses>
NULL|UefiCpuPkg/Library/CpuCommonFeaturesLib/CpuCommonFeaturesLib.inf
}
UefiCpuPkg/CpuIo2Smm/CpuIo2Smm.inf
UefiCpuPkg/CpuIo2Smm/CpuIo2StandaloneMm.inf
UefiCpuPkg/CpuMpPei/CpuMpPei.inf
UefiCpuPkg/CpuS3DataDxe/CpuS3DataDxe.inf
UefiCpuPkg/Library/BaseUefiCpuLib/BaseUefiCpuLib.inf
UefiCpuPkg/Library/BaseXApicLib/BaseXApicLib.inf
UefiCpuPkg/Library/BaseXApicX2ApicLib/BaseXApicX2ApicLib.inf
UefiCpuPkg/Library/CpuCommonFeaturesLib/CpuCommonFeaturesLib.inf
UefiCpuPkg/Library/CpuExceptionHandlerLib/DxeCpuExceptionHandlerLib.inf
!if $(TOOL_CHAIN_TAG) != "XCODE5"
UefiCpuPkg/Library/CpuExceptionHandlerLib/SecPeiCpuExceptionHandlerLib.inf
!endif
UefiCpuPkg/Library/CpuExceptionHandlerLib/SmmCpuExceptionHandlerLib.inf
UefiCpuPkg/Library/CpuExceptionHandlerLib/PeiCpuExceptionHandlerLib.inf
UefiCpuPkg/Library/CpuExceptionHandlerLib/Xcode5SecPeiCpuExceptionHandlerLib.inf
UefiCpuPkg/Library/MpInitLib/PeiMpInitLib.inf
UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf
UefiCpuPkg/Library/MpInitLibUp/MpInitLibUp.inf
UefiCpuPkg/Library/MtrrLib/MtrrLib.inf
UefiCpuPkg/Library/PlatformSecLibNull/PlatformSecLibNull.inf
UefiCpuPkg/Library/RegisterCpuFeaturesLib/PeiRegisterCpuFeaturesLib.inf
UefiCpuPkg/Library/RegisterCpuFeaturesLib/DxeRegisterCpuFeaturesLib.inf
UefiCpuPkg/Library/SmmCpuPlatformHookLibNull/SmmCpuPlatformHookLibNull.inf
UefiCpuPkg/Library/SmmCpuFeaturesLib/SmmCpuFeaturesLib.inf
UefiCpuPkg/Library/SmmCpuFeaturesLib/SmmCpuFeaturesLibStm.inf
UefiCpuPkg/Library/SmmCpuFeaturesLib/StandaloneMmCpuFeaturesLib.inf
UefiCpuPkg/Library/VmgExitLibNull/VmgExitLibNull.inf
UefiCpuPkg/PiSmmCommunication/PiSmmCommunicationPei.inf
UefiCpuPkg/PiSmmCommunication/PiSmmCommunicationSmm.inf
UefiCpuPkg/SecCore/SecCore.inf
UefiCpuPkg/SecMigrationPei/SecMigrationPei.inf
UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.inf
UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.inf {
<Defines>
FILE_GUID = D1D74FE9-7A4E-41D3-A0B3-67F13AD34D94
<LibraryClasses>
SmmCpuFeaturesLib|UefiCpuPkg/Library/SmmCpuFeaturesLib/SmmCpuFeaturesLibStm.inf
}
UefiCpuPkg/Universal/Acpi/S3Resume2Pei/S3Resume2Pei.inf
UefiCpuPkg/ResetVector/Vtf0/Bin/ResetVector.inf
[BuildOptions]
*_*_*_CC_FLAGS = -D DISABLE_NEW_DEPRECATED_INTERFACES
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