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

[RFC PATCH v1 0/6] Resolve unwanted DMA backing with IOMMU · Dmitry Osipenko <digetx@gmail.com> · 2018-07-26
[RFC PATCH v1 1/6] driver core: Add option for disabling of backing devices DMA with IOMMU · Dmitry Osipenko <digetx@gmail.com> · 2018-07-26
[RFC PATCH v1 4/6] gpu: host1x: Avoid implicit DMA backing with IOMMU · Dmitry Osipenko <digetx@gmail.com> · 2018-07-26
[RFC PATCH v1 5/6] drm/nouveau: tegra: Universally avoid implicit DMA backing with IOMMU · Dmitry Osipenko <digetx@gmail.com> · 2018-07-26
[RFC PATCH v1 6/6] Revert "drm/nouveau: tegra: Detach from ARM DMA/IOMMU mapping" · Dmitry Osipenko <digetx@gmail.com> · 2018-07-26
[RFC PATCH v1 3/6] drm/tegra: Avoid implicit DMA backing with IOMMU · Dmitry Osipenko <digetx@gmail.com> · 2018-07-26
[RFC PATCH v1 2/6] of/device: Don't back devices DMA with IOMMU if that's undesired by driver · Dmitry Osipenko <digetx@gmail.com> · 2018-07-26
Re: [RFC PATCH v1 0/6] Resolve unwanted DMA backing with IOMMU · Joerg Roedel <joro@8bytes.org> · 2018-07-27
Re: [RFC PATCH v1 0/6] Resolve unwanted DMA backing with IOMMU · Will Deacon <hidden> · 2018-07-27
Re: [RFC PATCH v1 0/6] Resolve unwanted DMA backing with IOMMU · Dmitry Osipenko <digetx@gmail.com> · 2018-07-27
Re: [RFC PATCH v1 0/6] Resolve unwanted DMA backing with IOMMU · Joerg Roedel <joro@8bytes.org> · 2018-07-27
Re: [RFC PATCH v1 0/6] Resolve unwanted DMA backing with IOMMU · Rob Herring <robh+dt@kernel.org> · 2018-07-27
Re: [RFC PATCH v1 0/6] Resolve unwanted DMA backing with IOMMU · Joerg Roedel <joro@8bytes.org> · 2018-07-27
Re: [RFC PATCH v1 0/6] Resolve unwanted DMA backing with IOMMU · Dmitry Osipenko <digetx@gmail.com> · 2018-07-27
Re: [RFC PATCH v1 0/6] Resolve unwanted DMA backing with IOMMU · Robin Murphy <robin.murphy@arm.com> · 2018-07-27
Re: [RFC PATCH v1 0/6] Resolve unwanted DMA backing with IOMMU · Jordan Crouse <hidden> · 2018-07-27
Re: [RFC PATCH v1 0/6] Resolve unwanted DMA backing with IOMMU · Dmitry Osipenko <digetx@gmail.com> · 2018-07-27
Re: [RFC PATCH v1 0/6] Resolve unwanted DMA backing with IOMMU · Dmitry Osipenko <digetx@gmail.com> · 2018-07-28
Re: [RFC PATCH v1 0/6] Resolve unwanted DMA backing with IOMMU · Dmitry Osipenko <digetx@gmail.com> · 2018-08-02
Re: [RFC PATCH v1 0/6] Resolve unwanted DMA backing with IOMMU · Robin Murphy <robin.murphy@arm.com> · 2018-08-03
Re: [RFC PATCH v1 0/6] Resolve unwanted DMA backing with IOMMU · Jordan Crouse <hidden> · 2018-08-03
Re: [RFC PATCH v1 0/6] Resolve unwanted DMA backing with IOMMU · Dmitry Osipenko <digetx@gmail.com> · 2018-08-15
Re: [RFC PATCH v1 0/6] Resolve unwanted DMA backing with IOMMU · Robin Murphy <robin.murphy@arm.com> · 2018-08-16
Re: [RFC PATCH v1 0/6] Resolve unwanted DMA backing with IOMMU · Dmitry Osipenko <digetx@gmail.com> · 2018-09-20

From: Joerg Roedel <joro@8bytes.org>
Date: 2018-07-27 08:25:18
Also in: dri-devel, linux-iommu, linux-tegra, lkml, nouveau

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

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