From: devel@edk2.groups.io <devel@edk2.groups.io>
On Behalf Of Wu, Hao A
Sent: Tuesday, August 31, 2021 12:25 PM
To: devel@edk2.groups.io; Bassa, Damian <damian.bassa@intel.com>
Subject: Re: [edk2-devel] [PATCH] MdeModulePkg/PciBusDxe: Enumerator to check for RCiEP before looking for RP
Really sorry,
Could you help to provide more information on the below statement?
“undefined parent register accesses”
Thanks in advance.
Best Regards,
Hao Wu
From: devel@edk2.groups.io <devel@edk2.groups.io>
On Behalf Of Bassa, Damian
Sent: Tuesday, August 24, 2021 11:15 PM
To: devel@edk2.groups.io
Subject: [edk2-devel] [PATCH] MdeModulePkg/PciBusDxe: Enumerator to check for RCiEP before looking for RP
Before trying to access parent root port to check ARI capabilities,
enumerator should see if Endpoint device is not Root Complex integrated
to avoid undefined parent register accesses in these cases.
Signed-off-by: Damian Bassa
damian.bassa@intel.com
---
.../Bus/Pci/PciBusDxe/PciEnumeratorSupport.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumeratorSupport.c b/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumeratorSupport.c
index db1b35f8ef..6451fb8af9 100644
--- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumeratorSupport.c
+++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumeratorSupport.c
@@ -2153,6 +2153,7 @@ CreatePciIoDevice (
PCI_IO_DEVICE *PciIoDevice;
EFI_PCI_IO_PROTOCOL *PciIo;
EFI_STATUS Status;
+ PCI_REG_PCIE_CAPABILITY Capability;
PciIoDevice = AllocateZeroPool (sizeof (PCI_IO_DEVICE));
if (PciIoDevice == NULL) {
@@ -2229,7 +2230,16 @@ CreatePciIoDevice (
return NULL;
}
- if (PcdGetBool (PcdAriSupport)) {
+ PciIo->Pci.Read (
+ PciIo,
+ EfiPciIoWidthUint16,
+ PciIoDevice->PciExpressCapabilityOffset + OFFSET_OF (PCI_CAPABILITY_PCIEXP, Capability),
+ 1,
+ &Capability.Uint16
+ );
+
+ if (PcdGetBool (PcdAriSupport) &&
+ Capability.Bits.DevicePortType != PCIE_DEVICE_PORT_TYPE_ROOT_COMPLEX_INTEGRATED_ENDPOINT) {
//
// Check if the device is an ARI device.
//
--
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