Re: [regression, bisected, pci/iommu] Bug 216865 - Black screen when amdgpu started during 6.2-rc1 boot with AMD IOMMU enabled

[Baolu Lu]

On 2023/1/10 21:25, Jason Gunthorpe wrote:

+       } else {
+               if (!pdev->bus->self ||
+                   !pci_acs_path_enabled(pdev->bus->self, NULL,
+                                         PCI_ACS_RR | PCI_ACS_UF))
+                       return -EINVAL;
+       }

Why would these be exclusive? Both the path and endpoint needs to be
checked

If the device is not an MFD, do we still need to check the ACS on it?
Perhaps I didn't get your point correctly.

--
Best regards,
baolu