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

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Message-ID: <6dd9dbac-9b65-bc7c-bb08-413a05d09fc8@sieb.net>
Date:   Thu, 15 Jun 2017 10:01:53 -0700
From:   Samuel Sieb <samuel@...b.net>
To:     Joerg Roedel <jroedel@...e.de>, Bjorn Helgaas <bhelgaas@...gle.com>
Cc:     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>
Subject: Re: [PATCH v2] PCI: Add ATS-disable quirk for AMD Stoney GPUs

On 06/15/2017 07:04 AM, Joerg Roedel wrote:
> Hi Bjorn,
> 
> 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>
>> ---
>>   drivers/pci/quirks.c | 19 +++++++++++++++++++
>>   1 file changed, 19 insertions(+)
> 
> Any more objections on this patch? Please let me know if you want to
> have something changed.

The other patch seems to fix this issue without disabling ATS.  Isn't 
that better?