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: <134da31d-2cf4-431f-2739-aa2940087245@bell.net>
Date:   Tue, 10 Jan 2023 15:51:59 -0500
From:   Matt Fagnani <matt.fagnani@...l.net>
To:     Christian König <christian.koenig@....com>,
        Jason Gunthorpe <jgg@...dia.com>
Cc:     Baolu Lu <baolu.lu@...ux.intel.com>,
        Alex Deucher <alexander.deucher@....com>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        Vasant Hegde <vasant.hegde@....com>,
        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

Christian,

I'm attaching the output of sudo lspci -vvvv. I'm not sure what $bus_id 
is in this case. I guess it might be 00 in 00:00.0. I attached the dmesg 
from previous boots with 6.2-rc1 at 
https://bugzilla.kernel.org/show_bug.cgi?id=216865#c2 as I mentioned at 
https://lore.kernel.org/all/52583644-d875-a454-7288-8b00ea0566ae@bell.net/ 
and 6.2-rc2 + Vasant's patch with rd.driver.blacklist=amdgpu on the 
kernel command line at 
https://lore.kernel.org/all/ff26929d-9fb0-3c85-2594-dc2937c1ba9a@bell.net/ 
I'm using the Radeon R5 integrated GPU which is called Wani in lspci and 
Carrizo in dmesg. The CPU is AMD A10-9620P which is Bristol Ridge or 
Excavator+ according to 
https://en.wikipedia.org/wiki/List_of_AMD_accelerated_processing_units 
I'm using the internal Elan touchscreen in the laptop. I'm not using the 
HDMI port for an external monitor or audio which I think is called 
Kabini HDMI/DP Audio in lspci

Thanks,

Matt

On 1/10/23 08:56, Christian König wrote:
> Am 10.01.23 um 14:51 schrieb Jason Gunthorpe:
>> 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?
>
> Yeah, potentially. Could I get a full "sudo lspci -vvvv -s $bus_id" + 
> dmesg of that device?
>
> Thanks,
> Christian.
>
>>
>> Jason
>
View attachment "lspci-vvvv-1.txt" of type "text/plain" (40624 bytes)