[PATCH] IntelSiliconPkg IntelVTdDxe: Use TPL to protect list/engine operation

[Star Zeng <star.zeng@intel.com>]

Cc: Jiewen Yao <jiewen.yao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Star Zeng <star.zeng@intel.com>
---
 IntelSiliconPkg/Feature/VTd/IntelVTdDxe/BmDma.c    | 19 ++++++-------
 .../Feature/VTd/IntelVTdDxe/DmaProtection.c        |  8 +++---
 .../Feature/VTd/IntelVTdDxe/DmaProtection.h        |  2 ++
 .../Feature/VTd/IntelVTdDxe/IntelVTdDxe.c          | 32 +++++++++-------------
 4 files changed, 28 insertions(+), 33 deletions(-)

diff --git a/IntelSiliconPkg/Feature/VTd/IntelVTdDxe/BmDma.c b/IntelSiliconPkg/Feature/VTd/IntelVTdDxe/BmDma.c
index e8685666e79a..57e086a64dbc 100644
--- a/IntelSiliconPkg/Feature/VTd/IntelVTdDxe/BmDma.c
+++ b/IntelSiliconPkg/Feature/VTd/IntelVTdDxe/BmDma.c
@@ -1,7 +1,7 @@
 /** @file
   BmDma related function
 
-  Copyright (c) 2017, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2017 - 2018, 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
@@ -12,15 +12,7 @@
 
 **/
 
-#include <PiDxe.h>
-
-#include <Protocol/IoMmu.h>
-
-#include <Library/BaseLib.h>
-#include <Library/DebugLib.h>
-#include <Library/BaseMemoryLib.h>
-#include <Library/MemoryAllocationLib.h>
-#include <Library/UefiBootServicesTableLib.h>
+#include "DmaProtection.h"
 
 // TBD: May make it a policy
 #define DMA_MEMORY_TOP          MAX_UINTN
@@ -76,6 +68,7 @@ IoMmuMap (
   MAP_INFO                                          *MapInfo;
   EFI_PHYSICAL_ADDRESS                              DmaMemoryTop;
   BOOLEAN                                           NeedRemap;
+  EFI_TPL                                           OriginalTpl;
 
   if (NumberOfBytes == NULL || DeviceAddress == NULL ||
       Mapping == NULL) {
@@ -198,7 +191,9 @@ IoMmuMap (
     MapInfo->DeviceAddress = MapInfo->HostAddress;
   }
 
+  OriginalTpl = gBS->RaiseTPL (VTD_TPL_LEVEL);
   InsertTailList (&gMaps, &MapInfo->Link);
+  gBS->RestoreTPL (OriginalTpl);
 
   //
   // The DeviceAddress is the address of the maped buffer below 4GB
@@ -233,6 +228,7 @@ IoMmuUnmap (
 {
   MAP_INFO                 *MapInfo;
   LIST_ENTRY               *Link;
+  EFI_TPL                  OriginalTpl;
 
   DEBUG ((DEBUG_VERBOSE, "IoMmuUnmap: 0x%08x\n", Mapping));
 
@@ -241,6 +237,7 @@ IoMmuUnmap (
     return EFI_INVALID_PARAMETER;
   }
 
+  OriginalTpl = gBS->RaiseTPL (VTD_TPL_LEVEL);
   MapInfo = NULL;
   for (Link = GetFirstNode (&gMaps)
        ; !IsNull (&gMaps, Link)
@@ -255,10 +252,12 @@ IoMmuUnmap (
   // Mapping is not a valid value returned by Map()
   //
   if (MapInfo != Mapping) {
+    gBS->RestoreTPL (OriginalTpl);
     DEBUG ((DEBUG_ERROR, "IoMmuUnmap: %r\n", EFI_INVALID_PARAMETER));
     return EFI_INVALID_PARAMETER;
   }
   RemoveEntryList (&MapInfo->Link);
+  gBS->RestoreTPL (OriginalTpl);
 
   if (MapInfo->DeviceAddress != MapInfo->HostAddress) {
     //
diff --git a/IntelSiliconPkg/Feature/VTd/IntelVTdDxe/DmaProtection.c b/IntelSiliconPkg/Feature/VTd/IntelVTdDxe/DmaProtection.c
index 648f64c20b77..013823cc161f 100644
--- a/IntelSiliconPkg/Feature/VTd/IntelVTdDxe/DmaProtection.c
+++ b/IntelSiliconPkg/Feature/VTd/IntelVTdDxe/DmaProtection.c
@@ -478,7 +478,7 @@ InitializeDmaProtection (
   
   Status = gBS->CreateEventEx (
                   EVT_NOTIFY_SIGNAL,
-                  TPL_CALLBACK,
+                  VTD_TPL_LEVEL,
                   AcpiNotificationFunc,
                   NULL,
                   &gEfiAcpi10TableGuid,
@@ -488,7 +488,7 @@ InitializeDmaProtection (
 
   Status = gBS->CreateEventEx (
                   EVT_NOTIFY_SIGNAL,
-                  TPL_CALLBACK,
+                  VTD_TPL_LEVEL,
                   AcpiNotificationFunc,
                   NULL,
                   &gEfiAcpi20TableGuid,
@@ -505,7 +505,7 @@ InitializeDmaProtection (
 
   Status = gBS->CreateEventEx (
                   EVT_NOTIFY_SIGNAL,
-                  TPL_CALLBACK,
+                  VTD_TPL_LEVEL,
                   OnExitBootServices,
                   NULL,
                   &gEfiEventExitBootServicesGuid,
@@ -514,7 +514,7 @@ InitializeDmaProtection (
   ASSERT_EFI_ERROR (Status);
 
   Status = EfiCreateEventLegacyBootEx (
-             TPL_CALLBACK,
+             VTD_TPL_LEVEL,
              OnLegacyBoot,
              NULL,
              &LegacyBootEvent
diff --git a/IntelSiliconPkg/Feature/VTd/IntelVTdDxe/DmaProtection.h b/IntelSiliconPkg/Feature/VTd/IntelVTdDxe/DmaProtection.h
index 519a5ab00450..bc14ff9a6631 100644
--- a/IntelSiliconPkg/Feature/VTd/IntelVTdDxe/DmaProtection.h
+++ b/IntelSiliconPkg/Feature/VTd/IntelVTdDxe/DmaProtection.h
@@ -48,6 +48,8 @@
 #define ALIGN_VALUE_UP(Value, Alignment)  (((Value) + (Alignment) - 1) & (~((Alignment) - 1)))
 #define ALIGN_VALUE_LOW(Value, Alignment) ((Value) & (~((Alignment) - 1)))
 
+#define VTD_TPL_LEVEL TPL_NOTIFY
+
 //
 // This is the initial max PCI DATA number.
 // The number may be enlarged later.
diff --git a/IntelSiliconPkg/Feature/VTd/IntelVTdDxe/IntelVTdDxe.c b/IntelSiliconPkg/Feature/VTd/IntelVTdDxe/IntelVTdDxe.c
index 89d9bea3fc0f..570b47cf7364 100644
--- a/IntelSiliconPkg/Feature/VTd/IntelVTdDxe/IntelVTdDxe.c
+++ b/IntelSiliconPkg/Feature/VTd/IntelVTdDxe/IntelVTdDxe.c
@@ -12,16 +12,6 @@
 
 **/
 
-#include <PiDxe.h>
-
-#include <Protocol/IoMmu.h>
-#include <Protocol/PciIo.h>
-
-#include <Library/IoLib.h>
-#include <Library/BaseLib.h>
-#include <Library/DebugLib.h>
-#include <Library/UefiBootServicesTableLib.h>
-
 #include "DmaProtection.h"
 
 /**
@@ -306,18 +296,22 @@ IoMmuSetAttribute (
   EFI_STATUS            Status;
   EFI_PHYSICAL_ADDRESS  DeviceAddress;
   UINTN                 NumberOfPages;
+  EFI_TPL               OriginalTpl;
+
+  OriginalTpl = gBS->RaiseTPL (VTD_TPL_LEVEL);
 
   Status = GetDeviceInfoFromMapping (Mapping, &DeviceAddress, &NumberOfPages);
-  if (EFI_ERROR(Status)) {
-    return Status;
+  if (!EFI_ERROR(Status)) {
+    Status = VTdSetAttribute (
+               This,
+               DeviceHandle,
+               DeviceAddress,
+               EFI_PAGES_TO_SIZE(NumberOfPages),
+               IoMmuAccess
+               );
   }
-  Status = VTdSetAttribute (
-             This,
-             DeviceHandle,
-             DeviceAddress,
-             EFI_PAGES_TO_SIZE(NumberOfPages),
-             IoMmuAccess
-             );
+
+  gBS->RestoreTPL (OriginalTpl);
 
   return Status;
 }
-- 
2.7.0.windows.1