MdeModulePkg/Bus/Pci/PciBusDxe: Support PCIe Resizable BAR Capability

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=313

Add PcdPcieResizableBarSupport to enable/disable PCIe Resizable
BAR Capability fearture.
Program the Resizable BAR Register if the device suports PCIe Resizable
BAR Capability and PcdPcieResizableBarSupport is TRUE.

Cc: Ray Ni <ray.ni@intel.com>
Cc: Hao A Wu <hao.a.wu@intel.com>
Signed-off-by: Heng Luo <heng.luo@intel.com>
Reviewed-by: Ray Ni <ray.ni@intel.com>

MdeModulePkg/Bus/Pci/PciBusDxe/PciLib.h

@@ -1,7 +1,7 @@
 /** @file
   Internal library declaration for PCI Bus module.
 
-Copyright (c) 2006 - 2011, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2006 - 2021, Intel Corporation. All rights reserved.<BR>
 SPDX-License-Identifier: BSD-2-Clause-Patent
 
 **/
@@ -24,6 +24,10 @@ typedef struct {
   UINT8                              *AllocRes;
 } EFI_RESOURCE_ALLOC_FAILURE_ERROR_DATA_PAYLOAD;
 
+typedef enum {
+  PciResizableBarMin = 0x00,
+  PciResizableBarMax = 0xFF
+} PCI_RESIZABLE_BAR_OPERATION;
 
 /**
   Retrieve the PCI Card device BAR information via PciIo interface.
@@ -156,4 +160,20 @@ PciHostBridgeEnumerator (
   IN EFI_PCI_HOST_BRIDGE_RESOURCE_ALLOCATION_PROTOCOL  *PciResAlloc
   );
 
+/**
+  This function is used to program the Resizable BAR Register.
+
+  @param PciIoDevice            A pointer to the PCI_IO_DEVICE.
+  @param ResizableBarOp         PciResizableBarMax: Set BAR to max size
+                                PciResizableBarMin: set BAR to min size.
+
+  @retval EFI_SUCCESS           Successfully enumerated the host bridge.
+  @retval other                 Some error occurred when enumerating the host bridge.
+
+**/
+EFI_STATUS
+PciProgramResizableBar (
+  IN PCI_IO_DEVICE                *PciIoDevice,
+  IN PCI_RESIZABLE_BAR_OPERATION  ResizableBarOp
+  );
 #endif