linux-kernel - Re: [RFC/RFT] Add noats flag to boot parameters

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Message-ID: <20180503135920.o2rdh3exai7qmkvu@8bytes.org>
Date:   Thu, 3 May 2018 15:59:21 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Sinan Kaya <okaya@...eaurora.org>
Cc:     Gil Kupfer <gilkup@...il.com>, dwmw2@...radead.org,
        bhelgaas@...gle.com, iommu@...ts.linux-foundation.org,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        nadav.amit@...il.com, Gil Kupfer <gilkup@...technion.ac.il>,
        Will Deacon <will.deacon@....com>
Subject: Re: [RFC/RFT] Add noats flag to boot parameters

On Thu, May 03, 2018 at 09:46:34AM -0400, Sinan Kaya wrote:
> I also like the idea in general.
> Minor nit..
> 
> Shouldn't this be an iommu parameter rather than a PCI kernel command line parameter?
> We now have an iommu.passthrough argument that prevents page translation.
> 
> Doesn't this fit into the same category especially when it is the IOMMU drivers that
> call ATS functions for enablement not the PCI drivers.

ATS is a bit of a grey area between PCI and IOMMU, but since ATS is
PCI-specific and the code to enable/disable it is in PCI as well, I
think the parameter makes sense for PCI too.


	Joerg