linux-kernel - Re: [PATCH] PCI: Blacklist AMD Stoney GPU devices for ATS

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Message-ID: <20170328205616.GR8329@suse.de>
Date:   Tue, 28 Mar 2017 22:56:16 +0200
From:   'Joerg Roedel' <jroedel@...e.de>
To:     "Deucher, Alexander" <Alexander.Deucher@....com>
Cc:     'Joerg Roedel' <joro@...tes.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Daniel Drake <drake@...lessm.com>,
        "Nath, Arindam" <Arindam.Nath@....com>
Subject: Re: [PATCH] PCI: Blacklist AMD Stoney GPU devices for ATS

On Tue, Mar 28, 2017 at 08:37:01PM +0000, Deucher, Alexander wrote:
> The question is, could the problem stem from flushing an entity that
> didn't request it, or should that not matter?  I guess it shouldn't
> matter otherwise we'd see this on other platforms like Carrizo as
> well.

What do you mean by "didn't request it"? The IOMMU driver only sends
io/tlb invalidations to devices it enabled ATS on.



	Joerg