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From: "Wu, Hao A" <hao.a.wu@intel.com>
To: "devel@edk2.groups.io" <devel@edk2.groups.io>,
	"Wu, Hao A" <hao.a.wu@intel.com>,
	"Bassa, Damian" <damian.bassa@intel.com>,
	"Ni, Ray" <ray.ni@intel.com>
Subject: Re: [edk2-devel] [PATCH] MdeModulePkg/PciBusDxe: Enumerator to check for RCiEP before looking for RP
Date: Tue, 31 Aug 2021 04:28:22 +0000	[thread overview]
Message-ID: <BN8PR11MB3666034205FC39E8FF5632CCCACC9@BN8PR11MB3666.namprd11.prod.outlook.com> (raw)
In-Reply-To: <BN8PR11MB3666214D66E8EF96887B2D81CACC9@BN8PR11MB3666.namprd11.prod.outlook.com>

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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

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  reply	other threads:[~2021-08-31  4:28 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-24 15:15 [PATCH] MdeModulePkg/PciBusDxe: Enumerator to check for RCiEP before looking for RP Bassa, Damian
2021-08-31  4:24 ` Wu, Hao A
2021-08-31  4:28   ` Wu, Hao A [this message]
2021-08-31 17:44     ` [edk2-devel] " Bassa, Damian
2021-09-08  7:16       ` Wu, Hao A
2021-09-15 11:53         ` Bassa, Damian
2021-09-15 13:21           ` Ni, Ray
2021-09-16 16:02             ` Bassa, Damian
2021-09-17 16:31               ` Ni, Ray
2021-09-20 16:24                 ` Bassa, Damian

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