linux-kernel - Re: [PATCH v1] gpu: host1x: Skip IOMMU initialization if firewall is enabled

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Date:   Sat, 07 Jul 2018 14:07:01 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Thierry Reding <thierry.reding@...il.com>
Cc:     Mikko Perttunen <cyndis@...si.fi>, linux-tegra@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] gpu: host1x: Skip IOMMU initialization if firewall is enabled

On Saturday, 19 May 2018 04:07:10 MSK Dmitry Osipenko wrote:
> Host1x's CDMA can't access the command buffers if IOMMU and Host1x
> firewall are enabled in the kernels config because firewall doesn't map
> the copied buffer into IOVA space. Fix this by skipping IOMMU
> initialization if firewall is enabled as firewall merges sparse cmdbufs
> into a single contiguous buffer and hence IOMMU isn't needed in this case.
> 
> Signed-off-by: Dmitry Osipenko <digetx@...il.com>

Thierry, please consider applying this patch.