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Date:      Tue, 4 Feb 2014 08:25:57 +0000
From:      "Robert N. M. Watson" <rwatson@FreeBSD.org>
To:        Adrian Chadd <adrian@freebsd.org>
Cc:        "src-committers@freebsd.org" <src-committers@freebsd.org>, "svn-src-all@freebsd.org" <svn-src-all@freebsd.org>, Gleb Smirnoff <glebius@freebsd.org>, James Gritton <jamie@freebsd.org>, "svn-src-head@freebsd.org" <svn-src-head@freebsd.org>, Alexander Leidinger <Alexander@leidinger.net>
Subject:   Re: svn commit: r261266 - in head: sys/dev/drm sys/kern sys/sys usr.sbin/jail
Message-ID:  <728A4D1D-32E9-400C-8045-58048B07A4B1@FreeBSD.org>
In-Reply-To: <CAJ-Vmok55HLNey-UXO%2BzxK1dAUC4K-uN=CDcsSiXj-eF%2BaYgSg@mail.gmail.com>
References:  <201401291341.s0TDfDcB068211@svn.freebsd.org> <20140129134344.GW66160@FreeBSD.org> <52E906CD.9050202@freebsd.org> <20140129222210.0000711f@unknown> <alpine.BSF.2.00.1401311231490.36707@fledge.watson.org> <20140131223011.0000163b@unknown> <52EC4DBB.50804@freebsd.org> <CAJ-Vmok55HLNey-UXO%2BzxK1dAUC4K-uN=CDcsSiXj-eF%2BaYgSg@mail.gmail.com>

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On 4 Feb 2014, at 07:53, Adrian Chadd <adrian@freebsd.org> wrote:

> I really would rather see Xorg gain whatever abstraction is necessary
> to probe/attach/interface with a DRI API supported graphics card.
>=20
> So, this then becomes a question of whether this is needed for DRI API
> supported graphics cards, or whether you're trying to solve the
> general case (eg for nvidia stuff.) It would be nice to enumerate
> what's required for different ways of interfacing to the graphics
> subsystem(s).

A safely delegable interface to DRI and friends would be excellent -- =
not just for jails, but just for the purposes of safely providing access =
to unprivileged components. However, looking at the recent history of =
GPU driver bugs (e.g., Samsung) I have worries. As IOMMUs become more =
widely available, that should help.

Robert=



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