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

[Baolu Lu <baolu.lu@xxxxxxxxxxxxxxx>]

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