If a device is a RCiEP, PciIoDev->Parent points to a virtual PCI_IO_DEVICE for
the RootComplex.
The PCI_IO_EVICE.Parent equals to NULL for RootComplex.
Which means, we can create a helper function
BOOLEAN IsRootBridge(PciIo) { return (BOOLEAN) (PciIo->Parent == NULL); }
your code can call this helper function.
From: Bassa, Damian <damian.ba...@intel.com>
Sent: Friday, September 17, 2021 12:02 AM
To: Ni, Ray <ray...@intel.com>; Wu, Hao A <hao.a...@intel.com>;
devel@edk2.groups.io
Cc: Kolakowski, Jacek <jacek.kolakow...@intel.com>
Subject: RE: [edk2-devel] [PATCH] MdeModulePkg/PciBusDxe: Enumerator to check
for RCiEP before looking for RP
I was looking for anything that wouldn't include reading register but only
thing that distinguish device PCI_IO_DEVICE instances with root bridge
instances is population of BusNumberRanges structure.
This technically could be used since this is populated only for root bridges
and not devices but using this would be just confusing since there is no
self-explanatory field there.
For my knowledge this is best way to tackle this issue. Please let me know if
there are have some other worth exploring ideas.
Damian
From: Ni, Ray <ray...@intel.com<mailto:ray...@intel.com>>
Sent: Wednesday, September 15, 2021 3:21 PM
To: Bassa, Damian <damian.ba...@intel.com<mailto:damian.ba...@intel.com>>; Wu,
Hao A <hao.a...@intel.com<mailto:hao.a...@intel.com>>;
devel@edk2.groups.io<mailto:devel@edk2.groups.io>
Subject: RE: [edk2-devel] [PATCH] MdeModulePkg/PciBusDxe: Enumerator to check
for RCiEP before looking for RP
Extending PciBus to support such case is valid.
But can you check if there is other pure software way to detect whether it's an
ECiEP?
From: Bassa, Damian <damian.ba...@intel.com<mailto:damian.ba...@intel.com>>
Sent: Wednesday, September 15, 2021 7:54 PM
To: Wu, Hao A <hao.a...@intel.com<mailto:hao.a...@intel.com>>;
devel@edk2.groups.io<mailto:devel@edk2.groups.io>; Ni, Ray
<ray...@intel.com<mailto:ray...@intel.com>>
Subject: RE: [edk2-devel] [PATCH] MdeModulePkg/PciBusDxe: Enumerator to check
for RCiEP before looking for RP
Should we consider this workaround? I'm having issues interpreting this part of
PCIe spec.
My understanding of this quote is that this capability can exist in but it
shouldn't be considered.
I would assume it's possible option that it needs to be considered? Is that
wrong?
Damian
From: Wu, Hao A <hao.a...@intel.com<mailto:hao.a...@intel.com>>
Sent: Wednesday, September 8, 2021 9:17 AM
To: Bassa, Damian <damian.ba...@intel.com<mailto:damian.ba...@intel.com>>;
devel@edk2.groups.io<mailto:devel@edk2.groups.io>; Ni, Ray
<ray...@intel.com<mailto:ray...@intel.com>>
Subject: RE: [edk2-devel] [PATCH] MdeModulePkg/PciBusDxe: Enumerator to check
for RCiEP before looking for RP
Really sorry for the late response.
So this is a workaround for RCiEP device that is not compliant to the PCIe spec:
|> ARI is an optional capability. This capability must be implemented by each
|> Function in an ARI Device. It is not applicable to a Root Port, a Switch
|> Downstream Port, an RCiEP, or a Root Complex Event Collector.
If this the case, could you help to:
* Add a comment that briefly describe this workaround before the newly added
code
* Also mention this workaround information in the commit log message.
* Send out a V2 version of the patch?
Thanks in advance.
Hello Ray, please help to raise if you have concern on this.
Best Regards,
Hao Wu
From: Bassa, Damian <damian.ba...@intel.com<mailto:damian.ba...@intel.com>>
Sent: Wednesday, September 1, 2021 1:45 AM
To: Wu, Hao A <hao.a...@intel.com<mailto:hao.a...@intel.com>>;
devel@edk2.groups.io<mailto:devel@edk2.groups.io>; Ni, Ray
<ray...@intel.com<mailto:ray...@intel.com>>
Subject: RE: [edk2-devel] [PATCH] MdeModulePkg/PciBusDxe: Enumerator to check
for RCiEP before looking for RP
It refers to access to the root port device that doesn't exist in case we are
dealing with RCiEP device.
There can be specific case where RCiEP device has ARI extended capability ID
(even though it's unsupported in this case).
In such a case PciSearchDevice goes to CreatePciIoDevice through
GatherDeviceInfo. And in this case parent is PCI_IO_DEVICE instance created
from CreateRootBridge function, which isn't valid PCIe device and doesn't have
specific bus, only a range of buses. In that case enumerator tries to use this
instance to read operation using default 0 bus number, which isn't correct.
Damian
From: Wu, Hao A <hao.a...@intel.com<mailto:hao.a...@intel.com>>
Sent: Tuesday, August 31, 2021 6:28 AM
To: devel@edk2.groups.io<mailto:devel@edk2.groups.io>; Wu, Hao A
<hao.a...@intel.com<mailto:hao.a...@intel.com>>; Bassa, Damian
<damian.ba...@intel.com<mailto:damian.ba...@intel.com>>; Ni, Ray
<ray...@intel.com<mailto:ray...@intel.com>>
Subject: RE: [edk2-devel] [PATCH] MdeModulePkg/PciBusDxe: Enumerator to check
for RCiEP before looking for RP
From: devel@edk2.groups.io<mailto:devel@edk2.groups.io>
<devel@edk2.groups.io<mailto:devel@edk2.groups.io>> On Behalf Of Wu, Hao A
Sent: Tuesday, August 31, 2021 12:25 PM
To: devel@edk2.groups.io<mailto:devel@edk2.groups.io>; Bassa, Damian
<damian.ba...@intel.com<mailto:damian.ba...@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.ba...@intel.com<mailto:damian.ba...@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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