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

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Date:   Tue, 10 Jan 2023 09:51:09 -0400
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Christian König <christian.koenig@....com>
Cc:     Baolu Lu <baolu.lu@...ux.intel.com>,
        Alex Deucher <alexander.deucher@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        Vasant Hegde <vasant.hegde@....com>,
        Matt Fagnani <matt.fagnani@...l.net>,
        Thorsten Leemhuis <regressions@...mhuis.info>,
        Joerg Roedel <jroedel@...e.de>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        LKML <linux-kernel@...r.kernel.org>,
        "regressions@...ts.linux.dev" <regressions@...ts.linux.dev>,
        Linux PCI <linux-pci@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        amd-gfx@...ts.freedesktop.org
Subject: Re: [regression, bisected, pci/iommu] Bug 216865 - Black screen when
 amdgpu started during 6.2-rc1 boot with AMD IOMMU enabled

On Tue, Jan 10, 2023 at 02:45:30PM +0100, Christian König wrote:

> Since this is a device integrated in the CPU it could be that the ACS/ATS
> functionalities are controlled by the BIOS and can be enabled/disabled
> there. But this should always enable/disable both.

This sounds like a GPU driver bug then, it should tolerate PASID being
unavailable because of BIOS issues/whatever and not black screen on
boot?

Jason