Re: [edk2-devel] [Patch V2] MdeModulePkg/DxeCorePerformanceLib:fix smm perf issue

["Ni, Ray" <ray.ni@intel.com>]

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Reviewed-by: Ray Ni <ray.ni@intel.com>

Thanks,
Ray
________________________________
From: Tan, Dun <dun.tan@intel.com>
Sent: Wednesday, August 30, 2023 3:35 PM
To: devel@edk2.groups.io <devel@edk2.groups.io>
Cc: Wang, Jian J <jian.j.wang@intel.com>; Gao, Liming <gaoliming@byosoft.com.cn>; Ni, Ray <ray.ni@intel.com>
Subject: [Patch V2] MdeModulePkg/DxeCorePerformanceLib:fix smm perf issue

Fix smm perf issue in DxeCorePerformanceLib. In
current code logic, total SMM perf record is copied
multiple times to FPDT table if multiple ReadyToBoot
events are signaled. This patch changes the function
InternalGetSmmPerfData() to only get newly generated
Smm perf data. Then previous generated Smm perf data
won't be copied to FPDT again.

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4470
Signed-off-by: Dun Tan <dun.tan@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Ray Ni <ray.ni@intel.com>
---
 MdeModulePkg/Library/DxeCorePerformanceLib/DxeCorePerformanceLib.c | 32 +++++++++++++++++++-------------
 1 file changed, 19 insertions(+), 13 deletions(-)

diff --git a/MdeModulePkg/Library/DxeCorePerformanceLib/DxeCorePerformanceLib.c b/MdeModulePkg/Library/DxeCorePerformanceLib/DxeCorePerformanceLib.c
index ef14bc0738..0a994be6a5 100644
--- a/MdeModulePkg/Library/DxeCorePerformanceLib/DxeCorePerformanceLib.c
+++ b/MdeModulePkg/Library/DxeCorePerformanceLib/DxeCorePerformanceLib.c
@@ -10,7 +10,7 @@
   This library is mainly used by DxeCore to start performance logging to ensure that
   Performance Protocol is installed at the very beginning of DXE phase.

-Copyright (c) 2006 - 2021, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2006 - 2023, Intel Corporation. All rights reserved.<BR>
 (C) Copyright 2016 Hewlett Packard Enterprise Development LP<BR>
 SPDX-License-Identifier: BSD-2-Clause-Patent

@@ -73,6 +73,7 @@ UINT8    *mPerformancePointer  = NULL;
 UINT8    *mBootRecordBuffer    = NULL;
 BOOLEAN  mLockInsertRecord     = FALSE;
 CHAR8    *mDevicePathString    = NULL;
+UINTN    mSmmBootRecordOffset  = 0;

 EFI_DEVICE_PATH_TO_TEXT_PROTOCOL  *mDevicePathToText = NULL;

@@ -236,6 +237,7 @@ InternalGetSmmPerfData (
   VOID                                     *SmmBootRecordData;
   UINTN                                    SmmBootRecordDataSize;
   UINTN                                    ReservedMemSize;
+  UINTN                                    SmmBootRecordDataRetrieved;

   //
   // Collect boot records from SMM drivers.
@@ -297,28 +299,32 @@ InternalGetSmmPerfData (
           }

           //
-          // Get all boot records
+          // Get boot records starting from mSmmBootRecordOffset
           //
-          SmmCommData->Function = SMM_FPDT_FUNCTION_GET_BOOT_RECORD_DATA_BY_OFFSET;
-          SmmBootRecordDataSize = SmmCommData->BootRecordSize;
-          SmmBootRecordData     = AllocateZeroPool (SmmBootRecordDataSize);
+          SmmCommData->Function         = SMM_FPDT_FUNCTION_GET_BOOT_RECORD_DATA_BY_OFFSET;
+          SmmCommData->BootRecordOffset = mSmmBootRecordOffset;
+          SmmBootRecordDataSize         = SmmCommData->BootRecordSize - mSmmBootRecordOffset;
+          SmmBootRecordData             = AllocateZeroPool (SmmBootRecordDataSize);
+          SmmBootRecordDataRetrieved    = 0;
           ASSERT (SmmBootRecordData  != NULL);
-          SmmCommData->BootRecordOffset = 0;
-          SmmCommData->BootRecordData   = (VOID *)((UINTN)SmmCommMemRegion->PhysicalStart + SMM_BOOT_RECORD_COMM_SIZE);
-          SmmCommData->BootRecordSize   = ReservedMemSize - SMM_BOOT_RECORD_COMM_SIZE;
-          while (SmmCommData->BootRecordOffset < SmmBootRecordDataSize) {
+          SmmCommData->BootRecordData = (VOID *)((UINTN)SmmCommMemRegion->PhysicalStart + SMM_BOOT_RECORD_COMM_SIZE);
+          SmmCommData->BootRecordSize = ReservedMemSize - SMM_BOOT_RECORD_COMM_SIZE;
+          while (SmmBootRecordDataRetrieved < SmmBootRecordDataSize) {
             Status = Communication->Communicate (Communication, SmmBootRecordCommBuffer, &CommSize);
             ASSERT_EFI_ERROR (Status);
             ASSERT_EFI_ERROR (SmmCommData->ReturnStatus);
-            if (SmmCommData->BootRecordOffset + SmmCommData->BootRecordSize > SmmBootRecordDataSize) {
-              CopyMem ((UINT8 *)SmmBootRecordData + SmmCommData->BootRecordOffset, SmmCommData->BootRecordData, SmmBootRecordDataSize - SmmCommData->BootRecordOffset);
+            if (SmmBootRecordDataRetrieved + SmmCommData->BootRecordSize > SmmBootRecordDataSize) {
+              CopyMem ((UINT8 *)SmmBootRecordData + SmmBootRecordDataRetrieved, SmmCommData->BootRecordData, SmmBootRecordDataSize - SmmBootRecordDataRetrieved);
             } else {
-              CopyMem ((UINT8 *)SmmBootRecordData + SmmCommData->BootRecordOffset, SmmCommData->BootRecordData, SmmCommData->BootRecordSize);
+              CopyMem ((UINT8 *)SmmBootRecordData + SmmBootRecordDataRetrieved, SmmCommData->BootRecordData, SmmCommData->BootRecordSize);
             }

-            SmmCommData->BootRecordOffset = SmmCommData->BootRecordOffset + SmmCommData->BootRecordSize;
+            SmmBootRecordDataRetrieved    += SmmCommData->BootRecordSize;
+            SmmCommData->BootRecordOffset += SmmCommData->BootRecordSize;
           }

+          mSmmBootRecordOffset = SmmCommData->BootRecordOffset;
+
           *SmmPerfData     = SmmBootRecordData;
           *SmmPerfDataSize = SmmBootRecordDataSize;
         }
--
2.31.1.windows.1



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