linux-kernel - Re: [PATCH v2] PCI: Add ATS-disable quirk for AMD Stoney GPUs

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Date:   Tue, 29 Aug 2017 13:02:41 -0700
From:   Samuel Sieb <samuel@...b.net>
To:     Bjorn Helgaas <helgaas@...nel.org>, Joerg Roedel <joro@...tes.org>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, Daniel Drake <drake@...lessm.com>,
        Alexander Deucher <Alexander.Deucher@....com>,
        David Woodhouse <dwmw2@...radead.org>,
        Joerg Roedel <jroedel@...e.de>
Subject: Re: [PATCH v2] PCI: Add ATS-disable quirk for AMD Stoney GPUs

On 07/12/2017 07:56 PM, Bjorn Helgaas wrote:
> On Fri, Apr 07, 2017 at 04:32:18PM +0200, Joerg Roedel wrote:
>> From: Joerg Roedel <jroedel@...e.de>
>>
>> ATS is broken on this hardware and causes IOMMU stalls and
>> system failure. Disable ATS on these devices to make them
>> usable again with IOMMU enabled.
>>
>> Note that the commit in the Fixes-tag is not buggy, it
>> just uncovers the problem in the hardware by increasing
>> the ATS-flush rate.
>>
>> Fixes: b1516a14657a ('iommu/amd: Implement flush queue')
>> Signed-off-by: Joerg Roedel <jroedel@...e.de>
> 
> Applied with Alex's ack to pci/virtualization for v4.14, thanks!

Is there any chance of getting this into an earlier kernel?  This is a 
pretty devastating bug for users!  I'm currently providing patched 
kernels, but if they run upgrades and get a new kernel without noticing 
it, any filesystem they access will get completely mangled.