Re: [edk2-devel] [PATCH] MdeModulePkg/PciBusDxe: Enumerator to check for RCiEP before looking for RP

["Wu, Hao A" <hao.a.wu@intel.com>]

[-- Attachment #1: Type: text/plain, Size: 3209 bytes --]

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<mailto:devel@edk2.groups.io> <devel@edk2.groups.io<mailto:devel@edk2.groups.io>> On Behalf Of Bassa, Damian
Sent: Tuesday, August 24, 2021 11:15 PM
To: devel@edk2.groups.io<mailto: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<mailto: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.
     //
--
2.27.0.windows.1

________________________________
Intel Technology Poland sp. z o.o.
ul. Słowackiego 173 | 80-298 Gdańsk | Sąd Rejonowy Gdańsk Północ | VII Wydział Gospodarczy Krajowego Rejestru Sądowego - KRS 101882 | NIP 957-07-52-316 | Kapitał zakładowy 200.000 PLN.

Ta wiadomość wraz z załącznikami jest przeznaczona dla określonego adresata i może zawierać informacje poufne. W razie przypadkowego otrzymania tej wiadomości, prosimy o powiadomienie nadawcy oraz trwałe jej usunięcie; jakiekolwiek przeglądanie lub rozpowszechnianie jest zabronione.
This e-mail and any attachments may contain confidential material for the sole use of the intended recipient(s). If you are not the intended recipient, please contact the sender and delete all copies; any review or distribution by others is strictly prohibited.



[-- Attachment #2: Type: text/html, Size: 8879 bytes --]