linux-kernel - Re: [RFC] enhancing the kernel's graphics subsystem

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Message-ID: <9e4733910705211756g3b72795ucc4a8883ff587861@mail.gmail.com>
Date:	Mon, 21 May 2007 20:56:25 -0400
From:	"Jon Smirl" <jonsmirl@...il.com>
To:	"Alan Cox" <alan@...rguk.ukuu.org.uk>
Cc:	"Jeff Garzik" <jeff@...zik.org>, "Dave Airlie" <airlied@...il.com>,
	"Jesse Barnes" <jbarnes@...tuousgeek.org>,
	"Jesse Barnes" <jesse.barnes@...el.com>,
	linux-kernel@...r.kernel.org,
	"Antonino A. Daplas" <adaplas@...il.com>
Subject: Re: [RFC] enhancing the kernel's graphics subsystem

> > So why do you want it in kernel.... security is not the sensible answer
> > here.

I'm not proposing the KGI solution where every device driver presents
the same API. That model does require a lot of code in the kernel.

The existing DRM model where each driver provides it's own API is a
good one. The user space DRI driver then takes this API and turns it
into a standard one. Applying the DRM style model to fbdev may allow
parts of fbdev to be moved out to user space.

What I don't want is a permanent root priv process hanging around in
the system. It simply isn't needed and I have prototyped a system that
runs without root so I know it can be done. With minor mods DRI can
run without the need for root, with more major mods the X server can
run without the need for root. Most of the mods to the X server are to
remove things like PCI bus probing, mode setting and VBIOS support.

-- 
Jon Smirl
jonsmirl@...il.com
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