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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Message-ID: <fa99d96e-6897-850a-8a46-98b03696e0bb@amd.com>
Date:   Tue, 10 Jan 2023 10:05:44 -0500
From:   Felix Kuehling <felix.kuehling@....com>
To:     Christian König <christian.koenig@....com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Baolu Lu <baolu.lu@...ux.intel.com>,
        Alex Deucher <alexander.deucher@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>
Cc:     Joerg Roedel <jroedel@...e.de>,
        "regressions@...ts.linux.dev" <regressions@...ts.linux.dev>,
        Thorsten Leemhuis <regressions@...mhuis.info>,
        Linux PCI <linux-pci@...r.kernel.org>,
        Vasant Hegde <vasant.hegde@....com>,
        amd-gfx@...ts.freedesktop.org, LKML <linux-kernel@...r.kernel.org>,
        "iommu@...ts.linux.dev" <iommu@...ts.linux.dev>,
        Matt Fagnani <matt.fagnani@...l.net>,
        Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [regression, bisected, pci/iommu] Bug 216865 - Black screen when amdgpu started during 6.2-rc1 boot with AMD IOMMU enabled

Am 2023-01-10 um 08:45 schrieb Christian König:
> And I'm like 99% sure that Kabini/Wani should be identical to that. 

Kabini is not supported by KFD. There should be no calls to 
amd_iommu_... functions on Kabini, at least not from kfd_iommu.c. And 
I'm not aware of any other callers in amdgpu.ko.

Regards,
   Felix