Modify the implementation of performance library so that:

PcdPerformanceLibraryPropertyMask can turn on/off performance measurement.

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@1395 6f19259b-4bc3-4df7-8a09-765794883524

EdkModulePkg/Library/DxeCorePerformanceLib/DxeCorePerformanceLib.c

@@ -236,7 +236,7 @@ StartGauge (
     //
     mGaugeData = CopyMem (mGaugeData, OldGaugeData, OldGaugeDataSize);
     
-    gBS->FreePool (OldGaugeData); 
+    FreePool (OldGaugeData); 
   }
   
   GaugeEntryArray               = (GAUGE_DATA_ENTRY *) (mGaugeData + 1);
@@ -421,6 +421,12 @@ DxeCorePerformanceLibConstructor (
 {
   EFI_STATUS                Status;
 
+  if (!PerformanceMeasurementEnabled ()) {
+    //
+    // Do not initialize performance infrastructure if not required.
+    //
+    return EFI_SUCCESS;
+  }
   //
   // Install the protocol interfaces.
   //

EdkModulePkg/Library/DxePerformanceLib/DxePerformanceLib.c

@@ -27,24 +27,30 @@ STATIC PERFORMANCE_PROTOCOL    *mPerformance = NULL;
   The constructor function locates Performance protocol from protocol database.
   It will ASSERT() if that operation fails and it will always return EFI_SUCCESS. 
 
-  @param  ImageHandle   The firmware allocated handle for the EFI image.
-  @param  SystemTable   A pointer to the EFI System Table.
-  
-  @retval EFI_SUCCESS   The constructor always returns EFI_SUCCESS.
+  @retval EFI_SUCCESS     Performance protocol is successfully located.
+  @retval Other           Performance protocol is not located to log performance.  
 
 **/
 EFI_STATUS
-EFIAPI
-PerformanceLibConstructor (
-  IN EFI_HANDLE        ImageHandle,
-  IN EFI_SYSTEM_TABLE  *SystemTable
+GetPerformanceProtocol (
+  VOID
   )
 {
   EFI_STATUS            Status;
+  PERFORMANCE_PROTOCOL  *Performance;
 
-  Status = gBS->LocateProtocol (&gPerformanceProtocolGuid, NULL, (VOID **) &mPerformance);
-  ASSERT_EFI_ERROR (Status);
-  ASSERT (mPerformance != NULL);
+  if (mPerformance != NULL) {
+    return EFI_SUCCESS;
+  }
+
+  Status = gBS->LocateProtocol (&gPerformanceProtocolGuid, NULL, (VOID **) &Performance);
+  if (!EFI_ERROR (Status)) {
+    ASSERT (Performance != NULL);
+    //
+    // Cache performance protocol.
+    //
+    mPerformance = Performance;
+  }
 
   return Status;
 }
@@ -79,9 +85,14 @@ StartPerformanceMeasurement (
   )
 {
   EFI_STATUS  Status;
+
+  Status = GetPerformanceProtocol ();
+  if (EFI_ERROR (Status)) {
+    return RETURN_OUT_OF_RESOURCES;
+  }
   
   Status = mPerformance->StartGauge (Handle, Token, Module, TimeStamp);
-
+  
   return (RETURN_STATUS) Status;
 }
 
@@ -119,6 +130,11 @@ EndPerformanceMeasurement (
 {
   EFI_STATUS  Status;
 
+  Status = GetPerformanceProtocol ();
+  if (EFI_ERROR (Status)) {
+    return RETURN_NOT_FOUND;
+  }
+
   Status = mPerformance->EndGauge (Handle, Token, Module, TimeStamp);
 
   return (RETURN_STATUS) Status;
@@ -181,6 +197,11 @@ GetPerformanceMeasurement (
   ASSERT (StartTimeStamp != NULL);
   ASSERT (EndTimeStamp != NULL);
 
+  Status = GetPerformanceProtocol ();
+  if (EFI_ERROR (Status)) {
+    return 0;
+  }
+
   Status = mPerformance->GetGauge (LogEntryKey++, &GaugeData);
   
   //

EdkModulePkg/Library/DxePerformanceLib/DxePerformanceLib.msa

@@ -63,9 +63,6 @@ WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
   <Externs>
     <Specification>EFI_SPECIFICATION_VERSION 0x00020000</Specification>
     <Specification>EDK_RELEASE_VERSION 0x00020000</Specification>
-    <Extern>
-      <Constructor>PerformanceLibConstructor</Constructor>
-    </Extern>
   </Externs>
   <PcdCoded>
     <PcdEntry PcdItemType="FIXED_AT_BUILD">