[PATCH v2 2/4] MdeModulePkg/UefiPxeBcDxe: Add Conflict Detection Process.

[Songpeng Li <songpeng.li@intel.com>]

v2: Modify UefiPxeBcDxe.inf file:
  tag protocol guid should be marked as BY_START

The current PxeBc Driver in MdeModulePkg and NetworkPkg has no conflict
detection when both installed in platform, this process is for conflict
driver detect.

Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=1278
Cc: Ye Ting <ting.ye@intel.com>
Cc: Wu Jiaxin <jiaxin.wu@intel.com>
Cc: Fu Siyuan <siyuan.fu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Songpeng Li <songpeng.li@intel.com>
---
 .../Network/UefiPxeBcDxe/PxeBcDriver.c        | 19 ++++++++++++++++++-
 .../Network/UefiPxeBcDxe/PxeBcImpl.h          |  3 ++-
 .../Network/UefiPxeBcDxe/UefiPxeBcDxe.inf     |  1 +
 3 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/MdeModulePkg/Universal/Network/UefiPxeBcDxe/PxeBcDriver.c b/MdeModulePkg/Universal/Network/UefiPxeBcDxe/PxeBcDriver.c
index 76c140d8e3..bd16f8b2e2 100644
--- a/MdeModulePkg/Universal/Network/UefiPxeBcDxe/PxeBcDriver.c
+++ b/MdeModulePkg/Universal/Network/UefiPxeBcDxe/PxeBcDriver.c
@@ -1,7 +1,7 @@
 /** @file
   The driver binding for UEFI PXEBC protocol.
 
-Copyright (c) 2007 - 2015, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2007 - 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
@@ -84,6 +84,19 @@ PxeBcDriverBindingSupported (
   EFI_PXE_BASE_CODE_PROTOCOL  *PxeBc;
   EFI_STATUS                  Status;
 
+  Status = gBS->OpenProtocol (
+                  ControllerHandle,
+                  &gEdkiiPxeBcTagProtocolGuid,
+                  NULL,
+                  This->DriverBindingHandle,
+                  ControllerHandle,
+                  EFI_OPEN_PROTOCOL_TEST_PROTOCOL
+                  );
+
+  if (!EFI_ERROR (Status)) {
+    return EFI_ALREADY_STARTED;
+  }
+
   Status = gBS->OpenProtocol (
                   ControllerHandle,
                   &gEfiPxeBaseCodeProtocolGuid,
@@ -370,6 +383,8 @@ PxeBcDriverBindingStart (
                   &Private->PxeBc,
                   &gEfiLoadFileProtocolGuid,
                   &Private->LoadFile,
+                  &gEdkiiPxeBcTagProtocolGuid,
+                  NULL,
                   NULL
                   );
   if (EFI_ERROR (Status)) {
@@ -573,6 +588,8 @@ PxeBcDriverBindingStop (
                   &Private->PxeBc,
                   &gEfiLoadFileProtocolGuid,
                   &Private->LoadFile,
+                  &gEdkiiPxeBcTagProtocolGuid,
+                  NULL,
                   NULL
                   );
 
diff --git a/MdeModulePkg/Universal/Network/UefiPxeBcDxe/PxeBcImpl.h b/MdeModulePkg/Universal/Network/UefiPxeBcDxe/PxeBcImpl.h
index e96b6f2c5d..0fceb35b82 100644
--- a/MdeModulePkg/Universal/Network/UefiPxeBcDxe/PxeBcImpl.h
+++ b/MdeModulePkg/Universal/Network/UefiPxeBcDxe/PxeBcImpl.h
@@ -1,6 +1,6 @@
 /** @file
 
-Copyright (c) 2007 - 2016, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2007 - 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
@@ -32,6 +32,7 @@ typedef struct _PXEBC_PRIVATE_DATA  PXEBC_PRIVATE_DATA;
 #include <Protocol/Arp.h>
 #include <Protocol/Ip4.h>
 #include <Protocol/Ip4Config2.h>
+#include <Protocol/PxeBcTag.h>
 
 #include <Library/DebugLib.h>
 #include <Library/DevicePathLib.h>
diff --git a/MdeModulePkg/Universal/Network/UefiPxeBcDxe/UefiPxeBcDxe.inf b/MdeModulePkg/Universal/Network/UefiPxeBcDxe/UefiPxeBcDxe.inf
index 0424019929..fbbec6c6b0 100644
--- a/MdeModulePkg/Universal/Network/UefiPxeBcDxe/UefiPxeBcDxe.inf
+++ b/MdeModulePkg/Universal/Network/UefiPxeBcDxe/UefiPxeBcDxe.inf
@@ -94,6 +94,7 @@
   gEfiIp4ServiceBindingProtocolGuid                ## TO_START
   gEfiIp4ProtocolGuid                              ## TO_START
   gEfiIp4Config2ProtocolGuid                       ## TO_START
+  gEdkiiPxeBcTagProtocolGuid                       ## BY_START
 
 [Pcd]
   gEfiMdeModulePkgTokenSpaceGuid.PcdTftpBlockSize  ## SOMETIMES_CONSUMES
-- 
2.18.0.windows.1