linux-kernel - Re: [RFC v2 8/8] drm: tegra: Add gr2d device

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Message-ID: <CAPM=9txCuPJcFAfD7Hu5o2BVFK=pVah7B8HhG0ctLCyFPwNEnA@mail.gmail.com>
Date:	Tue, 27 Nov 2012 17:33:59 +1000
From:	Dave Airlie <airlied@...il.com>
To:	Terje Bergström <tbergstrom@...dia.com>
Cc:	"thierry.reding@...onic-design.de" <thierry.reding@...onic-design.de>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Arto Merilainen <amerilainen@...dia.com>
Subject: Re: [RFC v2 8/8] drm: tegra: Add gr2d device

>
> Third would be having a firewall in 2D driver checking the stream and
> ensuring all registers that accept addresses are written by values
> derived from dmabufs. I haven't tried implementing this, but it'd
> involve a lookup table in kernel and CPU reading through the command
> stream. Offsets and sizes would also need to be validated. There would
> be a performance hit.

This is the standard mechanism, and what exynos does as well.

The per process VM method is also used as an extension to this on some hw.

Dave.
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