MdeModulePkg/PciBusDxe: make OPROM BAR degradation configurable

[mirror_edk2.git] / MdeModulePkg / Bus / Pci / PciBusDxe / PciResourceSupport.c

diff --git a/MdeModulePkg/Bus/Pci/PciBusDxe/PciResourceSupport.c b/MdeModulePkg/Bus/Pci/PciBusDxe/PciResourceSupport.c
index b0632d53b82b9ffba96cc3161b2430040b8d19cc..e93134613b488aad1b8c4fa5069500760769d562 100644 (file)
--- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciResourceSupport.c
+++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciResourceSupport.c
@@ -1058,48 +1058,50 @@ DegradeResource (
   LIST_ENTRY           *NextChildNodeLink;\r
   PCI_RESOURCE_NODE    *ResourceNode;\r
 \r
-  //\r
-  // If any child device has both option ROM and 64-bit BAR, degrade its PMEM64/MEM64\r
-  // requests in case that if a legacy option ROM image can not access 64-bit resources.\r
-  //\r
-  ChildDeviceLink = Bridge->ChildList.ForwardLink;\r
-  while (ChildDeviceLink != NULL && ChildDeviceLink != &Bridge->ChildList) {\r
-    PciIoDevice = PCI_IO_DEVICE_FROM_LINK (ChildDeviceLink);\r
-    if (PciIoDevice->RomSize != 0) {\r
-      if (!IsListEmpty (&Mem64Node->ChildList)) {      \r
-        ChildNodeLink = Mem64Node->ChildList.ForwardLink;\r
-        while (ChildNodeLink != &Mem64Node->ChildList) {\r
-          ResourceNode = RESOURCE_NODE_FROM_LINK (ChildNodeLink);\r
-          NextChildNodeLink = ChildNodeLink->ForwardLink;\r
-\r
-          if ((ResourceNode->PciDev == PciIoDevice) &&\r
-              (ResourceNode->Virtual || !PciIoDevice->PciBar[ResourceNode->Bar].BarTypeFixed)\r
-              ) {\r
-            RemoveEntryList (ChildNodeLink);\r
-            InsertResourceNode (Mem32Node, ResourceNode);\r
+  if (FeaturePcdGet (PcdPciDegradeResourceForOptionRom)) {\r
+    //\r
+    // If any child device has both option ROM and 64-bit BAR, degrade its PMEM64/MEM64\r
+    // requests in case that if a legacy option ROM image can not access 64-bit resources.\r
+    //\r
+    ChildDeviceLink = Bridge->ChildList.ForwardLink;\r
+    while (ChildDeviceLink != NULL && ChildDeviceLink != &Bridge->ChildList) {\r
+      PciIoDevice = PCI_IO_DEVICE_FROM_LINK (ChildDeviceLink);\r
+      if (PciIoDevice->RomSize != 0) {\r
+        if (!IsListEmpty (&Mem64Node->ChildList)) {\r
+          ChildNodeLink = Mem64Node->ChildList.ForwardLink;\r
+          while (ChildNodeLink != &Mem64Node->ChildList) {\r
+            ResourceNode = RESOURCE_NODE_FROM_LINK (ChildNodeLink);\r
+            NextChildNodeLink = ChildNodeLink->ForwardLink;\r
+\r
+            if ((ResourceNode->PciDev == PciIoDevice) &&\r
+                (ResourceNode->Virtual || !PciIoDevice->PciBar[ResourceNode->Bar].BarTypeFixed)\r
+                ) {\r
+              RemoveEntryList (ChildNodeLink);\r
+              InsertResourceNode (Mem32Node, ResourceNode);\r
+            }\r
+            ChildNodeLink = NextChildNodeLink;\r
           }\r
-          ChildNodeLink = NextChildNodeLink;\r
-        }        \r
-      }\r
+        }\r
 \r
-      if (!IsListEmpty (&PMem64Node->ChildList)) {      \r
-        ChildNodeLink = PMem64Node->ChildList.ForwardLink;\r
-        while (ChildNodeLink != &PMem64Node->ChildList) {\r
-          ResourceNode = RESOURCE_NODE_FROM_LINK (ChildNodeLink);\r
-          NextChildNodeLink = ChildNodeLink->ForwardLink;\r
-\r
-          if ((ResourceNode->PciDev == PciIoDevice) &&\r
-              (ResourceNode->Virtual || !PciIoDevice->PciBar[ResourceNode->Bar].BarTypeFixed)\r
-              ) {\r
-            RemoveEntryList (ChildNodeLink);\r
-            InsertResourceNode (PMem32Node, ResourceNode);\r
+        if (!IsListEmpty (&PMem64Node->ChildList)) {\r
+          ChildNodeLink = PMem64Node->ChildList.ForwardLink;\r
+          while (ChildNodeLink != &PMem64Node->ChildList) {\r
+            ResourceNode = RESOURCE_NODE_FROM_LINK (ChildNodeLink);\r
+            NextChildNodeLink = ChildNodeLink->ForwardLink;\r
+\r
+            if ((ResourceNode->PciDev == PciIoDevice) &&\r
+                (ResourceNode->Virtual || !PciIoDevice->PciBar[ResourceNode->Bar].BarTypeFixed)\r
+                ) {\r
+              RemoveEntryList (ChildNodeLink);\r
+              InsertResourceNode (PMem32Node, ResourceNode);\r
+            }\r
+            ChildNodeLink = NextChildNodeLink;\r
           }\r
-          ChildNodeLink = NextChildNodeLink;\r
-        }        \r
-      }\r
+        }\r
 \r
+      }\r
+      ChildDeviceLink = ChildDeviceLink->ForwardLink;\r
     }\r
-    ChildDeviceLink = ChildDeviceLink->ForwardLink;\r
   }\r
 \r
   //\r