Add the TPL raise/restore code for VariableSmmRuntimeDxe to avoid variable services reentry.

Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@14038 6f19259b-4bc3-4df7-8a09-765794883524

1 files changed, 78 insertions, 16 deletions

diff --git a/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmmRuntimeDxe.c b/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmmRuntimeDxe.c
index 442fe1dad7..e4d3aca193 100644
--- a/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmmRuntimeDxe.c
+++ b/MdeModulePkg/Universal/Variable/RuntimeDxe/VariableSmmRuntimeDxe.c
@@ -4,7 +4,7 @@
   and volatile storage space and install variable architecture protocol

   based on SMM variable module.

 

-Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR>

+Copyright (c) 2010 - 2012, Intel Corporation. All rights reserved.<BR>

 This program and the accompanying materials                          

 are licensed and made available under the terms and conditions of the BSD License         

 which accompanies this distribution.  The full text of the license may be found at        

@@ -42,7 +42,51 @@ EFI_SMM_COMMUNICATION_PROTOCOL  *mSmmCommunication          = NULL;
 UINT8                           *mVariableBuffer            = NULL;

 UINT8                           *mVariableBufferPhysical    = NULL;

 UINTN                            mVariableBufferSize;

+EFI_LOCK                         mVariableServicesLock;

 

+/**

+  Acquires lock only at boot time. Simply returns at runtime.

+

+  This is a temperary function that will be removed when

+  EfiAcquireLock() in UefiLib can handle the call in UEFI

+  Runtimer driver in RT phase.

+  It calls EfiAcquireLock() at boot time, and simply returns

+  at runtime.

+

+  @param  Lock         A pointer to the lock to acquire.

+

+**/

+VOID

+AcquireLockOnlyAtBootTime (

+  IN EFI_LOCK                             *Lock

+  )

+{

+  if (!EfiAtRuntime ()) {

+    EfiAcquireLock (Lock);

+  }

+}

+

+/**

+  Releases lock only at boot time. Simply returns at runtime.

+

+  This is a temperary function which will be removed when

+  EfiReleaseLock() in UefiLib can handle the call in UEFI

+  Runtimer driver in RT phase.

+  It calls EfiReleaseLock() at boot time and simply returns

+  at runtime.

+

+  @param  Lock         A pointer to the lock to release.

+

+**/

+VOID

+ReleaseLockOnlyAtBootTime (

+  IN EFI_LOCK                             *Lock

+  )

+{

+  if (!EfiAtRuntime ()) {

+    EfiReleaseLock (Lock);

+  }

+}

 

 /**

   Initialize the communicate buffer using DataSize and Function.

@@ -153,15 +197,17 @@ RuntimeServiceGetVariable (
   if ((*DataSize != 0) && (Data == NULL)) {

     return EFI_INVALID_PARAMETER;

   }

-  

+

+  AcquireLockOnlyAtBootTime(&mVariableServicesLock);

+

   //

   // Init the communicate buffer. The buffer data size is:

-  // SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE + PayloadSize + DataSize.

+  // SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE + PayloadSize.

   //

   PayloadSize = OFFSET_OF (SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE, Name) + StrSize (VariableName) + *DataSize;

   Status = InitCommunicateBuffer ((VOID **)&SmmVariableHeader, PayloadSize, SMM_VARIABLE_FUNCTION_GET_VARIABLE);

   if (EFI_ERROR (Status)) {

-    return Status;

+    goto Done;

   }

   ASSERT (SmmVariableHeader != NULL);

 

@@ -189,11 +235,13 @@ RuntimeServiceGetVariable (
   }

 

   if (EFI_ERROR (Status)) {

-    return Status;

+    goto Done;

   }

 

   CopyMem (Data, (UINT8 *)SmmVariableHeader->Name + SmmVariableHeader->NameSize, SmmVariableHeader->DataSize);

 

+Done:

+  ReleaseLockOnlyAtBootTime (&mVariableServicesLock);

   return Status;

 }

 

@@ -226,7 +274,9 @@ RuntimeServiceGetNextVariableName (
   if (VariableNameSize == NULL || VariableName == NULL || VendorGuid == NULL) {

     return EFI_INVALID_PARAMETER;

   }

-  

+

+  AcquireLockOnlyAtBootTime(&mVariableServicesLock);

+

   //

   // Init the communicate buffer. The buffer data size is:

   // SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE + PayloadSize.

@@ -234,7 +284,7 @@ RuntimeServiceGetNextVariableName (
   PayloadSize = OFFSET_OF (SMM_VARIABLE_COMMUNICATE_GET_NEXT_VARIABLE_NAME, Name) + *VariableNameSize; 

   Status = InitCommunicateBuffer ((VOID **)&SmmGetNextVariableName, PayloadSize, SMM_VARIABLE_FUNCTION_GET_NEXT_VARIABLE_NAME);

   if (EFI_ERROR (Status)) {

-    return Status;

+    goto Done;

   }

   ASSERT (SmmGetNextVariableName != NULL);

 

@@ -252,12 +302,14 @@ RuntimeServiceGetNextVariableName (
   //

   *VariableNameSize = SmmGetNextVariableName->NameSize;    

   if (EFI_ERROR (Status)) {

-    return Status;

+    goto Done;

   }

   

   CopyGuid (VendorGuid, &SmmGetNextVariableName->Guid);

   CopyMem (VariableName, SmmGetNextVariableName->Name, SmmGetNextVariableName->NameSize);  

 

+Done:

+  ReleaseLockOnlyAtBootTime (&mVariableServicesLock);

   return Status;

 }

 

@@ -302,7 +354,9 @@ RuntimeServiceSetVariable (
   if (DataSize != 0 && Data == NULL) {

     return EFI_INVALID_PARAMETER;

   }

-  

+

+  AcquireLockOnlyAtBootTime(&mVariableServicesLock);

+ 

   //

   // Init the communicate buffer. The buffer data size is:

   // SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE + PayloadSize.

@@ -310,7 +364,7 @@ RuntimeServiceSetVariable (
   PayloadSize = OFFSET_OF (SMM_VARIABLE_COMMUNICATE_ACCESS_VARIABLE, Name) + StrSize (VariableName) + DataSize;

   Status = InitCommunicateBuffer ((VOID **)&SmmVariableHeader, PayloadSize, SMM_VARIABLE_FUNCTION_SET_VARIABLE);

   if (EFI_ERROR (Status)) {

-    return Status;

+    goto Done;

   }

   ASSERT (SmmVariableHeader != NULL);

 

@@ -325,7 +379,9 @@ RuntimeServiceSetVariable (
   // Send data to SMM.

   //

   Status = SendCommunicateBuffer (PayloadSize);

- 

+

+Done:

+  ReleaseLockOnlyAtBootTime (&mVariableServicesLock);

   return Status;

 }

 

@@ -363,7 +419,9 @@ RuntimeServiceQueryVariableInfo (
   if(MaximumVariableStorageSize == NULL || RemainingVariableStorageSize == NULL || MaximumVariableSize == NULL || Attributes == 0) {

     return EFI_INVALID_PARAMETER;

   }

-  

+

+  AcquireLockOnlyAtBootTime(&mVariableServicesLock);

+

   //

   // Init the communicate buffer. The buffer data size is:

   // SMM_COMMUNICATE_HEADER_SIZE + SMM_VARIABLE_COMMUNICATE_HEADER_SIZE + PayloadSize;

@@ -371,7 +429,7 @@ RuntimeServiceQueryVariableInfo (
   PayloadSize = sizeof (SMM_VARIABLE_COMMUNICATE_QUERY_VARIABLE_INFO);

   Status = InitCommunicateBuffer ((VOID **)&SmmQueryVariableInfo, PayloadSize, SMM_VARIABLE_FUNCTION_QUERY_VARIABLE_INFO);

   if (EFI_ERROR (Status)) {

-    return Status;

+    goto Done;

   }

   ASSERT (SmmQueryVariableInfo != NULL);

 

@@ -382,7 +440,7 @@ RuntimeServiceQueryVariableInfo (
   //

   Status = SendCommunicateBuffer (PayloadSize);

   if (EFI_ERROR (Status)) {

-    return Status;

+    goto Done;

   }

 

   //

@@ -391,7 +449,9 @@ RuntimeServiceQueryVariableInfo (
   *MaximumVariableSize          = SmmQueryVariableInfo->MaximumVariableSize;

   *MaximumVariableStorageSize   = SmmQueryVariableInfo->MaximumVariableStorageSize;

   *RemainingVariableStorageSize = SmmQueryVariableInfo->RemainingVariableStorageSize; 

- 

+

+Done:

+  ReleaseLockOnlyAtBootTime (&mVariableServicesLock);

   return EFI_SUCCESS;

 }

 

@@ -589,7 +649,9 @@ VariableSmmRuntimeInitialize (
   VOID                                      *SmmVariableWriteRegistration;

   EFI_EVENT                                 OnReadyToBootEvent;

   EFI_EVENT                                 ExitBootServiceEvent;

-  

+

+  EfiInitializeLock (&mVariableServicesLock, TPL_NOTIFY);

+

   //

   // Smm variable service is ready

   //