[edk2] [PATCH] MdeModulePkg/PciBus: Shadow option ROM after BARs are programmed

Ard Biesheuvel ard.biesheuvel at linaro.org
Tue Dec 11 08:36:30 PST 2018


On Thu, 6 Dec 2018 at 13:51, Wu, Hao A <hao.a.wu at intel.com> wrote:
>
> > -----Original Message-----
> > From: Ni, Ruiyu
> > Sent: Wednesday, December 05, 2018 5:25 PM
> > To: edk2-devel at lists.01.org
> > Cc: Wu, Hao A
> > Subject: [PATCH] MdeModulePkg/PciBus: Shadow option ROM after BARs
> > are programmed
> >
> > REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1376
> >
> > Today's implementation reuses the 32bit MMIO resource requested by
> > all PCI devices MMIO BARs when shadowing the option ROM.
> > Take a simple example, a system has only one PCI device. It requires
> > 8MB 32bit MMIO and contains a 4MB option ROM. Today's implementation
> > only requests 8MB (max of 4M and 8M) 32bit MMIO from
> > PciHostBridgeResourceAllocation protocol. Let's assume the MMIO range
> > [3GB, 3GB+8MB) is allocated. The 3GB base address is firstly
> > programmed to the option ROM BAR for option ROM shadow. Then the
> > option ROM decoding is turned off and 3GB base address is programmed
> > to the 32bit MMIO BAR.
> >
> > It doesn't cause issues when the device doesn't request too much
> > MMIO.
> > But when the device contains a 64bit MMIO BAR which requests 4GB MMIO
> > and a 4MB option ROM. Let's assume [3GB, 3GB+8MB) 32bit MMIO range is
>
> "[3GB, 3GB+4MB)" here?
>
> > allocated for the option ROM. When the option ROM is being shadowed,
> > 64bit MMIO BAR is programmed to value 0, which means [0, 4GB) MMIO is
> > given to the 64bit BAR.
> > The range overlaps with the option ROM range which may cause the
> > device malfunction (e.g.: option ROM cannot be read out) when the
> > device has two separate decoders: one for MMIO BAR, the other for
> > option ROM.
> >
> > The patch requests dedicated MEM32 resource for Option ROMs and
> > moves the Option ROM shadow logic after all MMIO BARs are programmed.
> > The MMIO BAR setting to 0 when shadowing Option ROM is also skipped
> > because the MMIO BAR already contains the correct value.
>
> Reviewed-by: Hao Wu <hao.a.wu at intel.com>
>
> Best Regards,
> Hao Wu
>

Hello all,

On my SynQuacer system consisting of two separate root bridges, this
patch is breaking the boot if no PCI device is inserted (which means
no device at all is visible in the ECAM space)

Debug output as follows:

PCI Bus First Scanning
PciBus: Discovered PPB @ [00|00|00]

PciBus: Discovered PPB @ [01|01|00]

PciBus: Discovered PCI @ [02|00|00]
   BAR[0]: Type =   Io32; Alignment = 0x7;      Length = 0x8;   Offset = 0x10
   BAR[1]: Type =   Io32; Alignment = 0x3;      Length = 0x4;   Offset = 0x14
   BAR[2]: Type =   Io32; Alignment = 0x7;      Length = 0x8;   Offset = 0x18
   BAR[3]: Type =   Io32; Alignment = 0x3;      Length = 0x4;   Offset = 0x1C
   BAR[4]: Type =   Io32; Alignment = 0x1F;     Length = 0x20;  Offset = 0x20
   BAR[5]: Type =  Mem32; Alignment = 0xFFF;    Length = 0x200; Offset = 0x24

PciBus: Discovered PPB @ [01|03|00]

PciBus: Discovered PPB @ [01|05|00]

PciBus: Discovered PCI @ [04|00|00]
   BAR[0]: Type =  Mem64; Alignment = 0x1FFF;   Length = 0x2000;
 Offset = 0x10

PciBus: Discovered PPB @ [01|07|00]

PciBus: Discovered PCI @ [05|00|00]
 ARI: CapOffset = 0x150
 SR-IOV: SupportedPageSize = 0x553; SystemPageSize = 0x1; FirstVFOffset = 0x80;
         InitialVFs = 0x8; ReservedBusNum = 0x1; CapOffset = 0x160
   BAR[0]: Type =  Mem32; Alignment = 0xFFFFF;  Length = 0x100000;
 Offset = 0x10
   BAR[3]: Type =  Mem32; Alignment = 0x3FFF;   Length = 0x4000;
 Offset = 0x1C
 VFBAR[0]: Type = PMem64; Alignment = 0x3FFF;   Length = 0x20000;
 Offset = 0x184
 VFBAR[2]: Type = PMem64; Alignment = 0x3FFF;   Length = 0x20000;
 Offset = 0x190

PCI-IOV ScanBus - SubBusNumber - 0x6
PciBus: Discovered PCI @ [05|00|01]
 ARI: CapOffset = 0x150
 SR-IOV: SupportedPageSize = 0x553; SystemPageSize = 0x1; FirstVFOffset = 0x80;
         InitialVFs = 0x8; ReservedBusNum = 0x1; CapOffset = 0x160
   BAR[0]: Type =  Mem32; Alignment = 0xFFFFF;  Length = 0x100000;
 Offset = 0x10
   BAR[3]: Type =  Mem32; Alignment = 0x3FFF;   Length = 0x4000;
 Offset = 0x1C
 VFBAR[0]: Type = PMem64; Alignment = 0x3FFF;   Length = 0x20000;
 Offset = 0x184
 VFBAR[2]: Type = PMem64; Alignment = 0x3FFF;   Length = 0x20000;
 Offset = 0x190

PciBus: Discovered PPB @ [00|00|00]

PciBus: Discovered PPB @ [01|01|00]

PciBus: Discovered PCI @ [02|00|00]
   BAR[0]: Type =   Io32; Alignment = 0x7;      Length = 0x8;   Offset = 0x10
   BAR[1]: Type =   Io32; Alignment = 0x3;      Length = 0x4;   Offset = 0x14
   BAR[2]: Type =   Io32; Alignment = 0x7;      Length = 0x8;   Offset = 0x18
   BAR[3]: Type =   Io32; Alignment = 0x3;      Length = 0x4;   Offset = 0x1C
   BAR[4]: Type =   Io32; Alignment = 0x1F;     Length = 0x20;  Offset = 0x20
   BAR[5]: Type =  Mem32; Alignment = 0xFFF;    Length = 0x200; Offset = 0x24

PciBus: Discovered PPB @ [01|03|00]

PciBus: Discovered PPB @ [01|05|00]

PciBus: Discovered PCI @ [04|00|00]
   BAR[0]: Type =  Mem64; Alignment = 0x1FFF;   Length = 0x2000;
 Offset = 0x10

PciBus: Discovered PPB @ [01|07|00]

PciBus: Discovered PCI @ [05|00|00]
 ARI: CapOffset = 0x150
 SR-IOV: SupportedPageSize = 0x553; SystemPageSize = 0x1; FirstVFOffset = 0x80;
         InitialVFs = 0x8; ReservedBusNum = 0x1; CapOffset = 0x160
   BAR[0]: Type =  Mem32; Alignment = 0xFFFFF;  Length = 0x100000;
 Offset = 0x10
   BAR[3]: Type =  Mem32; Alignment = 0x3FFF;   Length = 0x4000;
 Offset = 0x1C
 VFBAR[0]: Type = PMem64; Alignment = 0x3FFF;   Length = 0x20000;
 Offset = 0x184
 VFBAR[2]: Type = PMem64; Alignment = 0x3FFF;   Length = 0x20000;
 Offset = 0x190

PciBus: Discovered PCI @ [05|00|01]
 ARI: CapOffset = 0x150
 SR-IOV: SupportedPageSize = 0x553; SystemPageSize = 0x1; FirstVFOffset = 0x80;
         InitialVFs = 0x8; ReservedBusNum = 0x1; CapOffset = 0x160
   BAR[0]: Type =  Mem32; Alignment = 0xFFFFF;  Length = 0x100000;
 Offset = 0x10
   BAR[3]: Type =  Mem32; Alignment = 0x3FFF;   Length = 0x4000;
 Offset = 0x1C
 VFBAR[0]: Type = PMem64; Alignment = 0x3FFF;   Length = 0x20000;
 Offset = 0x184
 VFBAR[2]: Type = PMem64; Alignment = 0x3FFF;   Length = 0x20000;
 Offset = 0x190

PciHostBridge: SubmitResources for PcieRoot(0x0)
 I/O: Granularity/SpecificFlag = 0 / 01
      Length/Alignment = 0x1000 / 0xFFF
 Mem: Granularity/SpecificFlag = 32 / 00
      Length/Alignment = 0x600000 / 0xFFFFF
 Mem: Granularity/SpecificFlag = 64 / 00
      Length/Alignment = 0x100000 / 0xFFFFF
PciBus: HostBridge->SubmitResources() - Success
PciHostBridge: SubmitResources for PcieRoot(0x1)
 Mem: Granularity/SpecificFlag = 32 / 00
      Length/Alignment = 0x0 / 0xFFFFFFFFFFFFFFFF
PciBus: HostBridge->SubmitResources() - Success
PciHostBridge: NotifyPhase (AllocateResources)
 RootBridge: PcieRoot(0x0)
  Mem64: Base/Length/Alignment = 3E00000000/100000/FFFFF - Success
  Mem: Base/Length/Alignment = 68000000/600000/FFFFF - Success
  I/O: Base/Length/Alignment = 0/1000/FFF - Success
 RootBridge: PcieRoot(0x1)
  Mem: Base/Length/Alignment = FFFFFFFFFFFFFFFF/0/FFFFFFFFFFFFFFFF -
Out Of Resource!
Call PciHostBridgeResourceConflict().
PciHostBridge: Resource conflict happens!
RootBridge[0]:
 I/O: Length/Alignment = 0x1000 / 0xFFF
 Mem: Length/Alignment = 0x600000 / 0xFFFFF
     Granularity/SpecificFlag = 32 / 00
 Mem: Length/Alignment = 0x0 / 0x0
     Granularity/SpecificFlag = 32 / 06 (Prefetchable)
 Mem: Length/Alignment = 0x100000 / 0xFFFFF
     Granularity/SpecificFlag = 64 / 00
 Mem: Length/Alignment = 0x0 / 0x0
     Granularity/SpecificFlag = 64 / 06 (Prefetchable)
 Bus: Length/Alignment = 0x7 / 0x0
RootBridge[1]:
 I/O: Length/Alignment = 0x0 / 0x0
 Mem: Length/Alignment = 0x0 / 0xFFFFFFFFFFFFFFFF
     Granularity/SpecificFlag = 32 / 00
 Mem: Length/Alignment = 0x0 / 0x0
     Granularity/SpecificFlag = 32 / 06 (Prefetchable)
 Mem: Length/Alignment = 0x0 / 0x0
     Granularity/SpecificFlag = 64 / 00
 Mem: Length/Alignment = 0x0 / 0x0
     Granularity/SpecificFlag = 64 / 06 (Prefetchable)
 Bus: Length/Alignment = 0x1 / 0x0
PciBus: HostBridge->NotifyPhase(AllocateResources) - Out of Resources
PciBus: [05|00|00] was rejected due to resource confliction.
PciHostBridge: SubmitResources for PcieRoot(0x0)
 I/O: Granularity/SpecificFlag = 0 / 01
      Length/Alignment = 0x1000 / 0xFFF
 Mem: Granularity/SpecificFlag = 32 / 00
      Length/Alignment = 0x500000 / 0xFFFFF
 Mem: Granularity/SpecificFlag = 64 / 00
      Length/Alignment = 0x100000 / 0xFFFFF
PciBus: HostBridge->SubmitResources() - Success
PciHostBridge: SubmitResources for PcieRoot(0x1)
 Mem: Granularity/SpecificFlag = 32 / 00
      Length/Alignment = 0x0 / 0xFFFFFFFFFFFFFFFF
PciBus: HostBridge->SubmitResources() - Success
PciHostBridge: NotifyPhase (AllocateResources)
 RootBridge: PcieRoot(0x0)
  Mem64: Base/Length/Alignment = 3E00000000/100000/FFFFF - Success
  Mem: Base/Length/Alignment = 68000000/500000/FFFFF - Success
  I/O: Base/Length/Alignment = 0/1000/FFF - Success
 RootBridge: PcieRoot(0x1)
  Mem: Base/Length/Alignment = FFFFFFFFFFFFFFFF/0/FFFFFFFFFFFFFFFF -
Out Of Resource!
Call PciHostBridgeResourceConflict().
PciHostBridge: Resource conflict happens!
RootBridge[0]:
 I/O: Length/Alignment = 0x1000 / 0xFFF
 Mem: Length/Alignment = 0x500000 / 0xFFFFF
     Granularity/SpecificFlag = 32 / 00
 Mem: Length/Alignment = 0x0 / 0x0
     Granularity/SpecificFlag = 32 / 06 (Prefetchable)
 Mem: Length/Alignment = 0x100000 / 0xFFFFF
     Granularity/SpecificFlag = 64 / 00
 Mem: Length/Alignment = 0x0 / 0x0
     Granularity/SpecificFlag = 64 / 06 (Prefetchable)
 Bus: Length/Alignment = 0x7 / 0x0
RootBridge[1]:
 I/O: Length/Alignment = 0x0 / 0x0
 Mem: Length/Alignment = 0x0 / 0xFFFFFFFFFFFFFFFF
     Granularity/SpecificFlag = 32 / 00
 Mem: Length/Alignment = 0x0 / 0x0
     Granularity/SpecificFlag = 32 / 06 (Prefetchable)
 Mem: Length/Alignment = 0x0 / 0x0
     Granularity/SpecificFlag = 64 / 00
 Mem: Length/Alignment = 0x0 / 0x0
     Granularity/SpecificFlag = 64 / 06 (Prefetchable)
 Bus: Length/Alignment = 0x1 / 0x0
PciBus: HostBridge->NotifyPhase(AllocateResources) - Out of Resources
PciBus: [05|00|01] was rejected due to resource confliction.
PciHostBridge: SubmitResources for PcieRoot(0x0)
 I/O: Granularity/SpecificFlag = 0 / 01
      Length/Alignment = 0x1000 / 0xFFF
 Mem: Granularity/SpecificFlag = 32 / 00
      Length/Alignment = 0x300000 / 0xFFFFF
PciBus: HostBridge->SubmitResources() - Success
PciHostBridge: SubmitResources for PcieRoot(0x1)
 Mem: Granularity/SpecificFlag = 32 / 00
      Length/Alignment = 0x0 / 0xFFFFFFFFFFFFFFFF
PciBus: HostBridge->SubmitResources() - Success
PciHostBridge: NotifyPhase (AllocateResources)
 RootBridge: PcieRoot(0x0)
  Mem64: Base/Length/Alignment = FFFFFFFFFFFFFFFF/0/FFFFF - Out Of Resource!
  Mem: Base/Length/Alignment = 68000000/300000/FFFFF - Success
 RootBridge: PcieRoot(0x1)
  Mem: Base/Length/Alignment = FFFFFFFFFFFFFFFF/0/FFFFFFFFFFFFFFFF -
Out Of Resource!
Call PciHostBridgeResourceConflict().
PciHostBridge: Resource conflict happens!
RootBridge[0]:
 I/O: Length/Alignment = 0x1000 / 0xFFF
 Mem: Length/Alignment = 0x300000 / 0xFFFFF
     Granularity/SpecificFlag = 32 / 00
 Mem: Length/Alignment = 0x0 / 0x0
     Granularity/SpecificFlag = 32 / 06 (Prefetchable)
 Mem: Length/Alignment = 0x0 / 0xFFFFF
     Granularity/SpecificFlag = 64 / 00
 Mem: Length/Alignment = 0x0 / 0x0
     Granularity/SpecificFlag = 64 / 06 (Prefetchable)
 Bus: Length/Alignment = 0x7 / 0x0
RootBridge[1]:
 I/O: Length/Alignment = 0x0 / 0x0
 Mem: Length/Alignment = 0x0 / 0xFFFFFFFFFFFFFFFF
     Granularity/SpecificFlag = 32 / 00
 Mem: Length/Alignment = 0x0 / 0x0
     Granularity/SpecificFlag = 32 / 06 (Prefetchable)
 Mem: Length/Alignment = 0x0 / 0x0
     Granularity/SpecificFlag = 64 / 00
 Mem: Length/Alignment = 0x0 / 0x0
     Granularity/SpecificFlag = 64 / 06 (Prefetchable)
 Bus: Length/Alignment = 0x1 / 0x0
PciBus: HostBridge->NotifyPhase(AllocateResources) - Out of Resources
PciBus: [02|00|00] was rejected due to resource confliction.
PciBus: [04|00|00] was rejected due to resource confliction.
PciHostBridge: SubmitResources for PcieRoot(0x0)
 Mem: Granularity/SpecificFlag = 32 / 00
      Length/Alignment = 0x0 / 0xFFFFFFFFFFFFFFFF
PciBus: HostBridge->SubmitResources() - Success
PciHostBridge: SubmitResources for PcieRoot(0x1)
 Mem: Granularity/SpecificFlag = 32 / 00
      Length/Alignment = 0x0 / 0xFFFFFFFFFFFFFFFF
PciBus: HostBridge->SubmitResources() - Success
PciHostBridge: NotifyPhase (AllocateResources)
 RootBridge: PcieRoot(0x0)
  Mem: Base/Length/Alignment = FFFFFFFFFFFFFFFF/0/FFFFFFFFFFFFFFFF -
Out Of Resource!
  Mem64: Base/Length/Alignment = FFFFFFFFFFFFFFFF/0/FFFFF - Out Of Resource!
 RootBridge: PcieRoot(0x1)
  Mem: Base/Length/Alignment = FFFFFFFFFFFFFFFF/0/FFFFFFFFFFFFFFFF -
Out Of Resource!
Call PciHostBridgeResourceConflict().
PciHostBridge: Resource conflict happens!
RootBridge[0]:
 I/O: Length/Alignment = 0x0 / 0xFFF
 Mem: Length/Alignment = 0x0 / 0xFFFFFFFFFFFFFFFF
     Granularity/SpecificFlag = 32 / 00
 Mem: Length/Alignment = 0x0 / 0x0
     Granularity/SpecificFlag = 32 / 06 (Prefetchable)
 Mem: Length/Alignment = 0x0 / 0xFFFFF
     Granularity/SpecificFlag = 64 / 00
 Mem: Length/Alignment = 0x0 / 0x0
     Granularity/SpecificFlag = 64 / 06 (Prefetchable)
 Bus: Length/Alignment = 0x7 / 0x0
RootBridge[1]:
 I/O: Length/Alignment = 0x0 / 0x0
 Mem: Length/Alignment = 0x0 / 0xFFFFFFFFFFFFFFFF
     Granularity/SpecificFlag = 32 / 00
 Mem: Length/Alignment = 0x0 / 0x0
     Granularity/SpecificFlag = 32 / 06 (Prefetchable)
 Mem: Length/Alignment = 0x0 / 0x0
     Granularity/SpecificFlag = 64 / 00
 Mem: Length/Alignment = 0x0 / 0x0
     Granularity/SpecificFlag = 64 / 06 (Prefetchable)
 Bus: Length/Alignment = 0x1 / 0x0
PciBus: HostBridge->NotifyPhase(AllocateResources) - Out of Resources






> >
> > Contributed-under: TianoCore Contribution Agreement 1.1
> > Signed-off-by: Ruiyu Ni <ruiyu.ni at intel.com>
> > Cc: Hao A Wu <hao.a.wu at intel.com>
> > ---
> >  MdeModulePkg/Bus/Pci/PciBusDxe/PciBus.h            |  3 +-
> >  MdeModulePkg/Bus/Pci/PciBusDxe/PciLib.c            | 71 ++++++++--------------
> >  .../Bus/Pci/PciBusDxe/PciOptionRomSupport.c        | 13 ----
> >  .../Bus/Pci/PciBusDxe/PciResourceSupport.c         | 37 ++++++++++-
> >  4 files changed, 62 insertions(+), 62 deletions(-)
> >
> > diff --git a/MdeModulePkg/Bus/Pci/PciBusDxe/PciBus.h
> > b/MdeModulePkg/Bus/Pci/PciBusDxe/PciBus.h
> > index f9eebdd5a8..6938802857 100644
> > --- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciBus.h
> > +++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciBus.h
> > @@ -1,7 +1,7 @@
> >  /** @file
> >    Header files and data structures needed by PCI Bus module.
> >
> > -Copyright (c) 2006 - 2017, Intel Corporation. All rights reserved.<BR>
> > +Copyright (c) 2006 - 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
> > @@ -67,6 +67,7 @@ typedef enum {
> >    PciBarTypePMem32,
> >    PciBarTypeMem64,
> >    PciBarTypePMem64,
> > +  PciBarTypeOpRom,
> >    PciBarTypeIo,
> >    PciBarTypeMem,
> >    PciBarTypeMaxType
> > diff --git a/MdeModulePkg/Bus/Pci/PciBusDxe/PciLib.c
> > b/MdeModulePkg/Bus/Pci/PciBusDxe/PciLib.c
> > index b81f81a136..7255bcfbbc 100644
> > --- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciLib.c
> > +++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciLib.c
> > @@ -24,6 +24,7 @@ CHAR16 *mBarTypeStr[] = {
> >    L"PMem32",
> >    L" Mem64",
> >    L"PMem64",
> > +  L" OpRom",
> >    L"    Io",
> >    L"   Mem",
> >    L"Unknow"
> > @@ -425,15 +426,9 @@ PciHostBridgeResourceAllocator (
> >    PCI_RESOURCE_NODE                              PMem32Pool;
> >    PCI_RESOURCE_NODE                              Mem64Pool;
> >    PCI_RESOURCE_NODE                              PMem64Pool;
> > -  BOOLEAN                                        ReAllocate;
> >    EFI_DEVICE_HANDLE_EXTENDED_DATA_PAYLOAD        HandleExtendedData;
> >    EFI_RESOURCE_ALLOC_FAILURE_ERROR_DATA_PAYLOAD
> > AllocFailExtendedData;
> >
> > -  //
> > -  // Reallocate flag
> > -  //
> > -  ReAllocate = FALSE;
> > -
> >    //
> >    // It may try several times if the resource allocation fails
> >    //
> > @@ -514,6 +509,17 @@ PciHostBridgeResourceAllocator (
> >                         PciResUsageTypical
> >                         );
> >
> > +      //
> > +      // Get the max ROM size that the root bridge can process
> > +      // Insert to resource map so that there will be dedicate MEM32 resource
> > range for Option ROM.
> > +      // All devices' Option ROM share the same MEM32 resource.
> > +      //
> > +      MaxOptionRomSize = GetMaxOptionRomSize (RootBridgeDev);
> > +      RootBridgeDev->PciBar[0].BarType   = PciBarTypeOpRom;
> > +      RootBridgeDev->PciBar[0].Length    = MaxOptionRomSize;
> > +      RootBridgeDev->PciBar[0].Alignment = MaxOptionRomSize - 1;
> > +      GetResourceFromDevice (RootBridgeDev, IoBridge, Mem32Bridge,
> > PMem32Bridge, Mem64Bridge, PMem64Bridge);
> > +
> >        //
> >        // Create resourcemap by going through all the devices subject to this
> > root bridge
> >        //
> > @@ -526,38 +532,6 @@ PciHostBridgeResourceAllocator (
> >          PMem64Bridge
> >          );
> >
> > -      //
> > -      // Get the max ROM size that the root bridge can process
> > -      //
> > -      RootBridgeDev->RomSize = Mem32Bridge->Length;
> > -
> > -      //
> > -      // Skip to enlarge the resource request during realloction
> > -      //
> > -      if (!ReAllocate) {
> > -        //
> > -        // Get Max Option Rom size for current root bridge
> > -        //
> > -        MaxOptionRomSize = GetMaxOptionRomSize (RootBridgeDev);
> > -
> > -        //
> > -        // Enlarger the mem32 resource to accomdate the option rom
> > -        // if the mem32 resource is not enough to hold the rom
> > -        //
> > -        if (MaxOptionRomSize > Mem32Bridge->Length) {
> > -
> > -          Mem32Bridge->Length     = MaxOptionRomSize;
> > -          RootBridgeDev->RomSize  = MaxOptionRomSize;
> > -
> > -          //
> > -          // Alignment should be adjusted as well
> > -          //
> > -          if (Mem32Bridge->Alignment < MaxOptionRomSize - 1) {
> > -            Mem32Bridge->Alignment = MaxOptionRomSize - 1;
> > -          }
> > -        }
> > -      }
> > -
> >        //
> >        // Based on the all the resource tree, construct ACPI resource node to
> >        // submit the resource aperture to pci host bridge protocol
> > @@ -760,8 +734,6 @@ PciHostBridgeResourceAllocator (
> >        if (EFI_ERROR (Status)) {
> >          return Status;
> >        }
> > -
> > -      ReAllocate = TRUE;
> >      }
> >    }
> >    //
> > @@ -828,11 +800,6 @@ PciHostBridgeResourceAllocator (
> >        &PMem64Base
> >        );
> >
> > -    //
> > -    // Process option rom for this root bridge
> > -    //
> > -    ProcessOptionRom (RootBridgeDev, Mem32Base, RootBridgeDev-
> > >RomSize);
> > -
> >      //
> >      // Create the entire system resource map from the information collected
> > by
> >      // enumerator. Several resource tree was created
> > @@ -889,6 +856,20 @@ PciHostBridgeResourceAllocator (
> >        PMem64Bridge
> >        );
> >
> > +    //
> > +    // Process Option ROM for this root bridge after all BARs are programmed.
> > +    // The PPB's MEM32 RANGE BAR is re-programmed to the Option ROM
> > BAR Base in order to
> > +    // shadow the Option ROM of the devices under the PPB.
> > +    // After the shadow, Option ROM BAR decoding is turned off and the
> > PPB's MEM32 RANGE
> > +    // BAR is restored back to the original value.
> > +    // The original value is programmed by ProgramResource() above.
> > +    //
> > +    DEBUG ((
> > +      DEBUG_INFO, "Process Option ROM: BAR Base/Length = %lx/%lx\n",
> > +      RootBridgeDev->PciBar[0].BaseAddress, RootBridgeDev-
> > >PciBar[0].Length
> > +      ));
> > +    ProcessOptionRom (RootBridgeDev, RootBridgeDev-
> > >PciBar[0].BaseAddress, RootBridgeDev->PciBar[0].Length);
> > +
> >      IoBridge    ->PciDev->PciBar[IoBridge    ->Bar].BaseAddress = IoBase;
> >      Mem32Bridge ->PciDev->PciBar[Mem32Bridge ->Bar].BaseAddress =
> > Mem32Base;
> >      PMem32Bridge->PciDev->PciBar[PMem32Bridge->Bar].BaseAddress =
> > PMem32Base;
> > diff --git a/MdeModulePkg/Bus/Pci/PciBusDxe/PciOptionRomSupport.c
> > b/MdeModulePkg/Bus/Pci/PciBusDxe/PciOptionRomSupport.c
> > index c2be85a906..aa314474dd 100644
> > --- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciOptionRomSupport.c
> > +++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciOptionRomSupport.c
> > @@ -583,23 +583,10 @@ RomDecode (
> >    )
> >  {
> >    UINT32              Value32;
> > -  UINT32              Offset;
> > -  UINT32              OffsetMax;
> >    EFI_PCI_IO_PROTOCOL *PciIo;
> >
> >    PciIo = &PciDevice->PciIo;
> >    if (Enable) {
> > -    //
> > -    // Clear all bars
> > -    //
> > -    OffsetMax = 0x24;
> > -    if (IS_PCI_BRIDGE(&PciDevice->Pci)) {
> > -      OffsetMax = 0x14;
> > -    }
> > -
> > -    for (Offset = 0x10; Offset <= OffsetMax; Offset += sizeof (UINT32)) {
> > -      PciIo->Pci.Write (PciIo, EfiPciIoWidthUint32, Offset, 1, &gAllZero);
> > -    }
> >
> >      //
> >      // set the Rom base address: now is hardcode
> > diff --git a/MdeModulePkg/Bus/Pci/PciBusDxe/PciResourceSupport.c
> > b/MdeModulePkg/Bus/Pci/PciBusDxe/PciResourceSupport.c
> > index f3e51d6150..d3cbefbadf 100644
> > --- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciResourceSupport.c
> > +++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciResourceSupport.c
> > @@ -446,13 +446,14 @@ GetResourceFromDevice (
> >      switch ((PciDev->PciBar)[Index].BarType) {
> >
> >      case PciBarTypeMem32:
> > +    case PciBarTypeOpRom:
> >
> >        Node = CreateResourceNode (
> >                PciDev,
> >                (PciDev->PciBar)[Index].Length,
> >                (PciDev->PciBar)[Index].Alignment,
> >                Index,
> > -              PciBarTypeMem32,
> > +              (PciDev->PciBar)[Index].BarType,
> >                PciResUsageTypical
> >                );
> >
> > @@ -1307,7 +1308,13 @@ ProgramBar (
> >                   1,
> >                   &Address
> >                   );
> > +  //
> > +  // Continue to the case PciBarTypeOpRom to set the BaseAddress.
> > +  // PciBarTypeOpRom is a virtual BAR only in root bridge, to capture
> > +  // the MEM32 resource requirement for Option ROM shadow.
> > +  //
> >
> > +  case PciBarTypeOpRom:
> >      Node->PciDev->PciBar[Node->Bar].BaseAddress = Address;
> >
> >      break;
> > @@ -1656,6 +1663,8 @@ ProgrameUpstreamBridgeForRom (
> >  {
> >    PCI_IO_DEVICE     *Parent;
> >    PCI_RESOURCE_NODE Node;
> > +  UINT64            Base;
> > +  UINT64            Length;
> >    //
> >    // For root bridge, just return.
> >    //
> > @@ -1667,7 +1676,6 @@ ProgrameUpstreamBridgeForRom (
> >      }
> >
> >      Node.PciDev     = Parent;
> > -    Node.Length     = PciDevice->RomSize;
> >      Node.Alignment  = 0;
> >      Node.Bar        = PPB_MEM32_RANGE;
> >      Node.ResType    = PciBarTypeMem32;
> > @@ -1677,10 +1685,33 @@ ProgrameUpstreamBridgeForRom (
> >      // Program PPB to only open a single <= 16MB apperture
> >      //
> >      if (Enable) {
> > +      //
> > +      // Save the original PPB_MEM32_RANGE BAR.
> > +      // The values will be changed by ProgramPpbApperture().
> > +      //
> > +      Base   = Parent->PciBar[Node.Bar].BaseAddress;
> > +      Length = Parent->PciBar[Node.Bar].Length;
> > +
> > +      //
> > +      // Only cover MMIO for Option ROM.
> > +      //
> > +      Node.Length     = PciDevice->RomSize;
> >        ProgramPpbApperture (OptionRomBase, &Node);
> > +
> > +      //
> > +      // Restore the original PPB_MEM32_RANGE BAR.
> > +      // So the MEM32 RANGE BAR register can be restored when disable the
> > decoding.
> > +      //
> > +      Parent->PciBar[Node.Bar].BaseAddress = Base;
> > +      Parent->PciBar[Node.Bar].Length      = Length;
> > +
> >        PCI_ENABLE_COMMAND_REGISTER (Parent,
> > EFI_PCI_COMMAND_MEMORY_SPACE);
> >      } else {
> > -      InitializePpb (Parent);
> > +      //
> > +      // Cover 32bit MMIO for devices below the bridge.
> > +      //
> > +      Node.Length     = Parent->PciBar[Node.Bar].Length;
> > +      ProgramPpbApperture (Parent->PciBar[Node.Bar].BaseAddress,
> > &Node);
> >        PCI_DISABLE_COMMAND_REGISTER (Parent,
> > EFI_PCI_COMMAND_MEMORY_SPACE);
> >      }
> >
> > --
> > 2.16.1.windows.1
>
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