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Date:   Thu, 11 Apr 2019 14:38:37 +0200
From:   Joerg Roedel <jroedel@suse.de>
To:     Nikolai Kostrigin <nickel@altlinux.org>
Cc:     linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH RESEND 1/1] PCI: Add ATS-disable quirk for AMD Radeon R7
 GPUs
Message-ID: <20190411123837.GF3349@suse.de>
References: <20190408103725.30426-1-nickel@altlinux.org>
 <20190408103725.30426-2-nickel@altlinux.org>
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On Mon, Apr 08, 2019 at 01:37:25PM +0300, Nikolai Kostrigin wrote:
> ATS is broken on this hardware (at least for Stoney Ridge
> based laptop) and causes IOMMU stalls and
> system failure. Disable ATS on these devices to make them
> usable again with IOMMU enabled
> Thanks to Joerg Roedel <jroedel@suse.de> for help.
> 
> https://bugzilla.kernel.org/show_bug.cgi?id=194521
> 
> Signed-off-by: Nikolai Kostrigin <nickel@altlinux.org>

Acked-by: Joerg Roedel <jroedel@suse.de>

I helped Nikolai with tracking this issue down to ATS handling and
suggested adding the quirk.