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| author | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2016-09-19 09:36:13 +0100 |
|---|---|---|
| committer | Ard Biesheuvel <ard.biesheuvel@linaro.org> | 2016-09-26 05:49:15 -0700 |
| commit | 065ae7d717f9e49c3be12dada109d60dead0bb90 (patch) | |
| tree | 1994e75536971a096087cb43320ebe42568c5698 /MdeModulePkg/Bus | |
| parent | 587e9dfbbafe7d4e772c1870b8c880c6d7a8a70c (diff) | |
| download | edk2-065ae7d717f9e49c3be12dada109d60dead0bb90.tar.gz edk2-065ae7d717f9e49c3be12dada109d60dead0bb90.tar.bz2 edk2-065ae7d717f9e49c3be12dada109d60dead0bb90.zip | |
MdeModulePkg/PciBusDxe: make OPROM BAR degradation configurable
The 'universal' PCI bus driver in MdeModulePkg contains a quirk to
degrade 64-bit PCI MMIO BARs to 32-bit in the presence of an option
ROM on the same PCI controller.
This quirk is highly specific to not just the X64 architecture in general,
but to the PC platform in particular, given that only X64 platforms that
require legacy PC BIOS compatibility require it. However, making the
quirk dependent on the presence of the legacy BIOS protocol met with
resistance, due to the fact that it introduces a dependency on the
IntelFrameworkModulePkg package.
So instead, make the quirk configurable, by introducing a feature flag PCD
'PcdPciDegradeResourceForOptionRom' which defaults to TRUE only for X64.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>
Diffstat (limited to 'MdeModulePkg/Bus')
| -rw-r--r-- | MdeModulePkg/Bus/Pci/PciBusDxe/PciBusDxe.inf | 7 | ||||
| -rw-r--r-- | MdeModulePkg/Bus/Pci/PciBusDxe/PciResourceSupport.c | 76 |
2 files changed, 43 insertions, 40 deletions
diff --git a/MdeModulePkg/Bus/Pci/PciBusDxe/PciBusDxe.inf b/MdeModulePkg/Bus/Pci/PciBusDxe/PciBusDxe.inf index 330ccc8cbf..a3ab11fd8d 100644 --- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciBusDxe.inf +++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciBusDxe.inf @@ -97,9 +97,10 @@ gEfiLoadFile2ProtocolGuid ## SOMETIMES_PRODUCES
[FeaturePcd]
- gEfiMdeModulePkgTokenSpaceGuid.PcdPciBusHotplugDeviceSupport ## CONSUMES
- gEfiMdeModulePkgTokenSpaceGuid.PcdPciBridgeIoAlignmentProbe ## CONSUMES
- gEfiMdeModulePkgTokenSpaceGuid.PcdUnalignedPciIoEnable ## CONSUMES
+ gEfiMdeModulePkgTokenSpaceGuid.PcdPciBusHotplugDeviceSupport ## CONSUMES
+ gEfiMdeModulePkgTokenSpaceGuid.PcdPciBridgeIoAlignmentProbe ## CONSUMES
+ gEfiMdeModulePkgTokenSpaceGuid.PcdUnalignedPciIoEnable ## CONSUMES
+ gEfiMdeModulePkgTokenSpaceGuid.PcdPciDegradeResourceForOptionRom ## CONSUMES
[Pcd]
gEfiMdeModulePkgTokenSpaceGuid.PcdSrIovSystemPageSize ## SOMETIMES_CONSUMES
diff --git a/MdeModulePkg/Bus/Pci/PciBusDxe/PciResourceSupport.c b/MdeModulePkg/Bus/Pci/PciBusDxe/PciResourceSupport.c index b0632d53b8..e93134613b 100644 --- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciResourceSupport.c +++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciResourceSupport.c @@ -1058,48 +1058,50 @@ DegradeResource ( LIST_ENTRY *NextChildNodeLink;
PCI_RESOURCE_NODE *ResourceNode;
- //
- // If any child device has both option ROM and 64-bit BAR, degrade its PMEM64/MEM64
- // requests in case that if a legacy option ROM image can not access 64-bit resources.
- //
- ChildDeviceLink = Bridge->ChildList.ForwardLink;
- while (ChildDeviceLink != NULL && ChildDeviceLink != &Bridge->ChildList) {
- PciIoDevice = PCI_IO_DEVICE_FROM_LINK (ChildDeviceLink);
- if (PciIoDevice->RomSize != 0) {
- if (!IsListEmpty (&Mem64Node->ChildList)) {
- ChildNodeLink = Mem64Node->ChildList.ForwardLink;
- while (ChildNodeLink != &Mem64Node->ChildList) {
- ResourceNode = RESOURCE_NODE_FROM_LINK (ChildNodeLink);
- NextChildNodeLink = ChildNodeLink->ForwardLink;
-
- if ((ResourceNode->PciDev == PciIoDevice) &&
- (ResourceNode->Virtual || !PciIoDevice->PciBar[ResourceNode->Bar].BarTypeFixed)
- ) {
- RemoveEntryList (ChildNodeLink);
- InsertResourceNode (Mem32Node, ResourceNode);
+ if (FeaturePcdGet (PcdPciDegradeResourceForOptionRom)) {
+ //
+ // If any child device has both option ROM and 64-bit BAR, degrade its PMEM64/MEM64
+ // requests in case that if a legacy option ROM image can not access 64-bit resources.
+ //
+ ChildDeviceLink = Bridge->ChildList.ForwardLink;
+ while (ChildDeviceLink != NULL && ChildDeviceLink != &Bridge->ChildList) {
+ PciIoDevice = PCI_IO_DEVICE_FROM_LINK (ChildDeviceLink);
+ if (PciIoDevice->RomSize != 0) {
+ if (!IsListEmpty (&Mem64Node->ChildList)) {
+ ChildNodeLink = Mem64Node->ChildList.ForwardLink;
+ while (ChildNodeLink != &Mem64Node->ChildList) {
+ ResourceNode = RESOURCE_NODE_FROM_LINK (ChildNodeLink);
+ NextChildNodeLink = ChildNodeLink->ForwardLink;
+
+ if ((ResourceNode->PciDev == PciIoDevice) &&
+ (ResourceNode->Virtual || !PciIoDevice->PciBar[ResourceNode->Bar].BarTypeFixed)
+ ) {
+ RemoveEntryList (ChildNodeLink);
+ InsertResourceNode (Mem32Node, ResourceNode);
+ }
+ ChildNodeLink = NextChildNodeLink;
}
- ChildNodeLink = NextChildNodeLink;
- }
- }
+ }
- if (!IsListEmpty (&PMem64Node->ChildList)) {
- ChildNodeLink = PMem64Node->ChildList.ForwardLink;
- while (ChildNodeLink != &PMem64Node->ChildList) {
- ResourceNode = RESOURCE_NODE_FROM_LINK (ChildNodeLink);
- NextChildNodeLink = ChildNodeLink->ForwardLink;
-
- if ((ResourceNode->PciDev == PciIoDevice) &&
- (ResourceNode->Virtual || !PciIoDevice->PciBar[ResourceNode->Bar].BarTypeFixed)
- ) {
- RemoveEntryList (ChildNodeLink);
- InsertResourceNode (PMem32Node, ResourceNode);
+ if (!IsListEmpty (&PMem64Node->ChildList)) {
+ ChildNodeLink = PMem64Node->ChildList.ForwardLink;
+ while (ChildNodeLink != &PMem64Node->ChildList) {
+ ResourceNode = RESOURCE_NODE_FROM_LINK (ChildNodeLink);
+ NextChildNodeLink = ChildNodeLink->ForwardLink;
+
+ if ((ResourceNode->PciDev == PciIoDevice) &&
+ (ResourceNode->Virtual || !PciIoDevice->PciBar[ResourceNode->Bar].BarTypeFixed)
+ ) {
+ RemoveEntryList (ChildNodeLink);
+ InsertResourceNode (PMem32Node, ResourceNode);
+ }
+ ChildNodeLink = NextChildNodeLink;
}
- ChildNodeLink = NextChildNodeLink;
- }
- }
+ }
+ }
+ ChildDeviceLink = ChildDeviceLink->ForwardLink;
}
- ChildDeviceLink = ChildDeviceLink->ForwardLink;
}
//
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