Re: [edk2-devel] [edk2-platforms][PATCH v3 1/1] MinPlatformPkg: Add FspNvsBuffer compression option

["Chiu, Chasel" <chasel.chiu@intel.com>]

	
Reviewed-by: Chasel Chiu <chasel.chiu@intel.com>

Thanks,
Chasel



> -----Original Message-----
> From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Michael
> Kubacki
> Sent: Tuesday, May 9, 2023 8:21 PM
> To: devel@edk2.groups.io
> Cc: Chiu, Chasel <chasel.chiu@intel.com>; Desimone, Nathaniel L
> <nathaniel.l.desimone@intel.com>; Oram, Isaac W <isaac.w.oram@intel.com>;
> Gao, Liming <gaoliming@byosoft.com.cn>; Dong, Eric <eric.dong@intel.com>;
> Gudla, Raghava <raghava.gudla@intel.com>
> Subject: [edk2-devel] [edk2-platforms][PATCH v3 1/1] MinPlatformPkg: Add
> FspNvsBuffer compression option
> 
> From: Michael Kubacki <michael.kubacki@microsoft.com>
> 
> Adds a PCD called "PcdEnableCompressedFspNvsBuffer" that allows the
> "FspNvsBuffer" UEFI variable data to be saved as compressed data.
> 
> Especially due to the nature of the data saved in this variable, it compresses well.
> For example, it has been found to reduce ~63KB of data to ~13KB. Boot time
> impact has been found to be negligible.
> 
> The default value is FALSE to keep default behavior consistent.
> 
> Decompression can be performed on the variable data using the standard
> UefiDecompressLib.
> 
> Cc: Chasel Chiu <chasel.chiu@intel.com>
> Cc: Nate DeSimone <nathaniel.l.desimone@intel.com>
> Cc: Isaac Oram <isaac.w.oram@intel.com>
> Cc: Liming Gao <gaoliming@byosoft.com.cn>
> Cc: Eric Dong <eric.dong@intel.com>
> Cc: Raghava Gudla <raghava.gudla@intel.com>
> Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
> ---
> 
> Notes:
>     v3:
>       - Rebase onto 7ac91ec277db
>       - Add CompressLib instance to CoreCommonLib.dsc
>     v2: Rebase onto 9769bf28d1fc
> 
> 
> Platform/Intel/MinPlatformPkg/FspWrapper/SaveMemoryConfig/SaveMemoryC
> onfig.c   | 62 ++++++++++++++++----
> 
> Platform/Intel/MinPlatformPkg/FspWrapper/SaveMemoryConfig/SaveMemoryC
> onfig.inf |  4 ++
>  Platform/Intel/MinPlatformPkg/Include/Dsc/CoreCommonLib.dsc                    |
> 1 +
>  Platform/Intel/MinPlatformPkg/MinPlatformPkg.dec                               |  6 ++
>  4 files changed, 60 insertions(+), 13 deletions(-)
> 
> diff --git
> a/Platform/Intel/MinPlatformPkg/FspWrapper/SaveMemoryConfig/SaveMemor
> yConfig.c
> b/Platform/Intel/MinPlatformPkg/FspWrapper/SaveMemoryConfig/SaveMemor
> yConfig.c
> index 0215e8eeddfb..95b8cef8b32b 100644
> ---
> a/Platform/Intel/MinPlatformPkg/FspWrapper/SaveMemoryConfig/SaveMemor
> yConfig.c
> +++
> b/Platform/Intel/MinPlatformPkg/FspWrapper/SaveMemoryConfig/SaveMemo
> +++ ryConfig.c
> @@ -3,6 +3,7 @@
>    exists, and saves the data to nvRAM.
> 
>  Copyright (c) 2017 - 2022, Intel Corporation. All rights reserved.<BR>
> +Copyright (c) Microsoft Corporation.<BR>
>  SPDX-License-Identifier: BSD-2-Clause-Patent
> 
>  **/
> @@ -10,6 +11,7 @@ SPDX-License-Identifier: BSD-2-Clause-Patent  #include
> <Base.h>  #include <Uefi.h>  #include <Library/BaseLib.h>
> +#include <Library/CompressLib.h>
>  #include <Library/UefiBootServicesTableLib.h>
>  #include <Library/UefiRuntimeServicesTableLib.h>
>  #include <Library/HobLib.h>
> @@ -19,6 +21,7 @@ SPDX-License-Identifier: BSD-2-Clause-Patent  #include
> <Library/BaseMemoryLib.h>  #include <Library/LargeVariableReadLib.h>
> #include <Library/LargeVariableWriteLib.h>
> +#include <Library/PcdLib.h>
>  #include <Library/VariableWriteLib.h>
>  #include <Guid/FspNonVolatileStorageHob2.h>
> 
> @@ -38,20 +41,26 @@ SaveMemoryConfigEntryPoint (
>    IN EFI_SYSTEM_TABLE   *SystemTable
>    )
>  {
> -  EFI_STATUS        Status;
> -  EFI_HOB_GUID_TYPE *GuidHob;
> -  VOID              *HobData;
> -  VOID              *VariableData;
> -  UINTN             DataSize;
> -  UINTN             BufferSize;
> -  BOOLEAN           DataIsIdentical;
> +  EFI_STATUS         Status;
> +  EFI_HOB_GUID_TYPE  *GuidHob;
> +  VOID               *HobData;
> +  VOID               *VariableData;
> +  UINTN              DataSize;
> +  UINTN              BufferSize;
> +  BOOLEAN            DataIsIdentical;
> +  VOID               *CompressedData;
> +  UINT64             CompressedSize;
> +  UINTN              CompressedAllocationPages;
> 
> -  DataSize        = 0;
> -  BufferSize      = 0;
> -  VariableData    = NULL;
> -  GuidHob         = NULL;
> -  HobData         = NULL;
> -  DataIsIdentical = FALSE;
> +  DataSize                  = 0;
> +  BufferSize                = 0;
> +  VariableData              = NULL;
> +  GuidHob                   = NULL;
> +  HobData                   = NULL;
> +  DataIsIdentical           = FALSE;
> +  CompressedData            = NULL;
> +  CompressedSize            = 0;
> +  CompressedAllocationPages = 0;
> 
>    //
>    // Search for the Memory Configuration GUID HOB.  If it is not present, then
> @@ -73,6 +82,29 @@ SaveMemoryConfigEntryPoint (
>      }
>    }
> 
> +  if (PcdGetBool (PcdEnableCompressedFspNvsBuffer)) {
> +    if (DataSize > 0) {
> +      CompressedAllocationPages = EFI_SIZE_TO_PAGES (DataSize);
> +      CompressedData            = AllocatePages (CompressedAllocationPages);
> +      if (CompressedData == NULL) {
> +        DEBUG ((DEBUG_ERROR, "[%a] - Failed to allocate compressed data
> buffer.\n", __FUNCTION__));
> +        ASSERT_EFI_ERROR (EFI_OUT_OF_RESOURCES);
> +        return EFI_OUT_OF_RESOURCES;
> +      }
> +
> +      CompressedSize = EFI_PAGES_TO_SIZE (CompressedAllocationPages);
> +      Status         = Compress (HobData, DataSize, CompressedData,
> &CompressedSize);
> +      if (EFI_ERROR (Status)) {
> +        DEBUG ((DEBUG_ERROR, "[%a] - failed to compress data. Status = %r\n",
> __FUNCTION__, Status));
> +        ASSERT_EFI_ERROR (Status);
> +        return Status;
> +      }
> +    }
> +
> +    HobData  = CompressedData;
> +    DataSize = (UINTN)CompressedSize;
> +  }
> +
>    if (HobData != NULL) {
>      DEBUG ((DEBUG_INFO, "FspNvsHob.NvsDataLength:%d\n", DataSize));
>      DEBUG ((DEBUG_INFO, "FspNvsHob.NvsDataPtr   : 0x%x\n", HobData));
> @@ -136,6 +168,10 @@ SaveMemoryConfigEntryPoint (
>      DEBUG((DEBUG_ERROR, "Memory S3 Data HOB was not found\n"));
>    }
> 
> +  if (CompressedData != NULL) {
> +    FreePages (CompressedData, CompressedAllocationPages);  }
> +
>    //
>    // This driver does not produce any protocol services, so always unload it.
>    //
> diff --git
> a/Platform/Intel/MinPlatformPkg/FspWrapper/SaveMemoryConfig/SaveMemor
> yConfig.inf
> b/Platform/Intel/MinPlatformPkg/FspWrapper/SaveMemoryConfig/SaveMemor
> yConfig.inf
> index 61e85a658693..0f12deb131ca 100644
> ---
> a/Platform/Intel/MinPlatformPkg/FspWrapper/SaveMemoryConfig/SaveMemor
> yConfig.inf
> +++
> b/Platform/Intel/MinPlatformPkg/FspWrapper/SaveMemoryConfig/SaveMemo
> +++ ryConfig.inf
> @@ -26,6 +26,7 @@ [LibraryClasses]
>    LargeVariableReadLib
>    LargeVariableWriteLib
>    BaseLib
> +  CompressLib
> 
>  [Packages]
>    MdePkg/MdePkg.dec
> @@ -45,6 +46,9 @@ [Guids]
>    gFspNonVolatileStorageHob2Guid                ## CONSUMES
>    gFspNvsBufferVariableGuid                     ## PRODUCES
> 
> +[Pcd]
> +  gMinPlatformPkgTokenSpaceGuid.PcdEnableCompressedFspNvsBuffer
> +
>  [Depex]
>    gEfiVariableArchProtocolGuid        AND
>    gEfiVariableWriteArchProtocolGuid
> \ No newline at end of file
> diff --git a/Platform/Intel/MinPlatformPkg/Include/Dsc/CoreCommonLib.dsc
> b/Platform/Intel/MinPlatformPkg/Include/Dsc/CoreCommonLib.dsc
> index 5ce21cf31e17..dfe7d836d32a 100644
> --- a/Platform/Intel/MinPlatformPkg/Include/Dsc/CoreCommonLib.dsc
> +++ b/Platform/Intel/MinPlatformPkg/Include/Dsc/CoreCommonLib.dsc
> @@ -147,6 +147,7 @@ [LibraryClasses.common]
> 
> BmpSupportLib|MdeModulePkg/Library/BaseBmpSupportLib/BaseBmpSupportLi
> b.inf
> 
> LargeVariableReadLib|MinPlatformPkg/Library/BaseLargeVariableLib/BaseLarg
> eVariableReadLib.inf
> 
> LargeVariableWriteLib|MinPlatformPkg/Library/BaseLargeVariableLib/BaseLarg
> eVariableWriteLib.inf
> +  CompressLib|MinPlatformPkg/Library/CompressLib/CompressLib.inf
> 
>    #
>    # CryptLib
> diff --git a/Platform/Intel/MinPlatformPkg/MinPlatformPkg.dec
> b/Platform/Intel/MinPlatformPkg/MinPlatformPkg.dec
> index 784abb828e76..45c75f8ec2c9 100644
> --- a/Platform/Intel/MinPlatformPkg/MinPlatformPkg.dec
> +++ b/Platform/Intel/MinPlatformPkg/MinPlatformPkg.dec
> @@ -311,6 +311,12 @@ [PcdsFixedAtBuild, PcdsPatchableInModule,
> PcdsDynamic, PcdsDynamicEx]
> 
> 
> gMinPlatformPkgTokenSpaceGuid.PcdPlatformMemoryCheckLevel|0|UINT32|0
> x30000009
> 
> +  ## Controls whether the FSP NVS buffer is saved as compressed data.
> +  # Data compression can significantly reduce variable storage usage for FSP
> NVS buffer data.
> +  # Platforms that choose to compress the data will need to decompress
> + the variable data upon  # extraction.
> +
> +
> gMinPlatformPkgTokenSpaceGuid.PcdEnableCompressedFspNvsBuffer|FALSE|B
> O
> + OLEAN|0x30000010
> +
>    ## This PCD is to control which device is the potential trusted console input
> device.<BR><BR>
>    # For example:<BR>
>    # USB Short Form: UsbHID(0xFFFF,0xFFFF,0x1,0x1)<BR>
> --
> 2.40.1.windows.1
> 
> 
> 
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