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

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Message-ID: <21d7e9970705211014j6eb59326u85f7347a3000f3d3@mail.gmail.com>
Date:	Mon, 21 May 2007 18:14:23 +0100
From:	"Dave Airlie" <airlied@...il.com>
To:	"Jon Smirl" <jonsmirl@...il.com>
Cc:	"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

>
> 1) Be upwards compatible with the existing fbdev drivers. This lets us
> avoid rewriting the 90 existing drivers. New drivers shouldn't break
> any old apps.
>

done.

> 2) Address the long outstanding issue of multi-seat at the console
> level. My solution to this is the one device per CRTC model.

done.

>
> 3) Eliminate the need for a root priv controlling process. Get rid of
> the potential for a security hole.

Stupid idea, we need something to control policy, this isn't going in
the kernel, it can be a lot smaller than X and auditable.. sticking
the DRI protocol in the kernel is just pointless..

> 4) OOPS should always display even if in a graphics mode

possible to do.

>
> 5) Support Secure Attention Key (SAK).

possible to do.

> 6) Eliminate the existing VT swap driver free for all. I would compile
> out the VT layer and replace it with a compatible API that enforces
> some sanity.

I'm hoping to look into this but it is a parallel problem to what this
code does, the VT switch API sucks rocks, so providing something
compatible is going to suck rocks..

> 7) Support Unicode on the console

This just needs a userspace console again a parallel problem that
really isn't much to do with the problem set this work is trying to
solve... it should enable it...

>
> 8) Allow multiple user space graphics systems to run. These user space
> systems should not touch the hardware, instead they ask the kernel
> driver to manipulate the hardware on their behalf. Of course the
> kernel driver is only the minimum code needed to arbitrate control of
> the resources - it doesn't do things like implement drawing
> algorithms.

No problems.

>
> 9) Booting on non-VGA hardware still needs to work.
>
> 10) Support things like cloning and output device selection.
>
No problems.

Dave.
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