linux-kernel - Re: [RFC PATCH v1 0/6] Resolve unwanted DMA backing with IOMMU

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Date:   Fri, 27 Jul 2018 10:25:13 +0200
From:   Joerg Roedel <joro@...tes.org>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Mikko Perttunen <cyndis@...si.fi>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Ben Skeggs <bskeggs@...hat.com>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Nicolas Chauvet <kwizart@...il.com>,
        devicetree@...r.kernel.org, nouveau@...ts.freedesktop.org,
        iommu@...ts.linux-foundation.org, dri-devel@...ts.freedesktop.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v1 0/6] Resolve unwanted DMA backing with IOMMU

On Fri, Jul 27, 2018 at 02:16:18AM +0300, Dmitry Osipenko wrote:
> The proposed solution adds a new option to the base device driver
> structure that allows device drivers to explicitly convey to the drivers
> core that the implicit IOMMU backing for devices must not happen.

Why is IOMMU mapping a problem for the Tegra GPU driver?

If we add something like this then it should not be the choice of the
device driver, but of the user and/or the firmware.


	Joerg