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From: James Simmons <jsimmons@infradead.org>
To: Greg KH <greg@kroah.com>
Cc: airlied@linux.ie, linux-kernel@vger.kernel.org
Subject: Re: gpu sharing layer for kernel
Date: Tue, 6 Feb 2007 19:40:43 +0000 (GMT)	[thread overview]
Message-ID: <Pine.LNX.4.64.0702061935300.9224@pentafluge.infradead.org> (raw)
In-Reply-To: <20070124214654.GA30634@kroah.com>


> On Wed, Jan 24, 2007 at 10:20:18PM +1100, airlied@linux.ie wrote:
> > This patch series contains the gpu sharing layer for kernel that I've
> > mentioned before. It should apply against Linus's git tree.
> 
> Yeah!

Finally after all these years!!!! Sorry about the delayed response I was 
busy with work.

> > Why do we want this?
> > 
> > Currently the kernel cannot provide both the fb and drm drivers with
> > access to the device model and this means the drm cannot get any
> > suspend/resume callbacks.  This layer attempts to fix this problem by
> > adding a bus for the gpu drivers to attach to. Currently a lowlevel
> > binding driver is needed along with optional fb and drm components.
> 
> If we were to allow this kind of "sharing" for all PCI devices would
> that work out instead?  Or would this layer still be needed?

Please do this. Its not only fbdev but backlight and display support.
Note display support is not main stream yet. Greg sent me a email about 
the DRM team needing a CRT class as well. That will be a different 
discussion. Plus some cards have tuners as well. So this device sharing is 
needed. It would also be really nice to prevent driver collisions. For 
example vesafb and a fbdev driver controlling the same hardware or acpi 
backlight versus the graphics card backlight support.

  parent reply	other threads:[~2007-02-06 19:40 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-01-24 11:20 airlied
2007-01-24 11:20 ` [PATCH] gpu: Initial gpu layer addition airlied
2007-01-24 11:20   ` [PATCH] gpu/radeon: add a radeon lowlevel GPU driver airlied
2007-01-24 11:20     ` [PATCH] gpu/radeonfb: add GPU support to radeonfb airlied
2007-01-24 11:20       ` [PATCH] gpu/drm: Add GPU layer support to generic DRM airlied
2007-01-24 11:20         ` [PATCH] drm/gpu/radeon: Add radeon DRM support to use GPU layer airlied
2007-01-25  0:07       ` [PATCH] gpu/radeonfb: add GPU support to radeonfb Benjamin Herrenschmidt
2007-01-30 19:50         ` Dave Airlie
2007-01-24 21:46 ` gpu sharing layer for kernel Greg KH
2007-01-24 22:39   ` Dave Airlie
2007-01-25 22:06     ` Greg KH
2007-01-28 21:16       ` Dave Jones
2007-02-07 18:42     ` James Simmons
2007-02-06 19:40   ` James Simmons [this message]
2007-01-25  7:56 ` Paul Collins
2007-01-30 19:49   ` Dave Airlie

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