linux-kernel - Re: Intel 965G: i915_dispatch_cmdbuffer failed (2.6.19-rc2)

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Message-ID: <20061017174020.GA24789@tau.solarneutrino.net>
Date:	Tue, 17 Oct 2006 13:40:20 -0400
From:	Ryan Richter <ryan@....solarneutrino.net>
To:	Keith Packard <keithp@...thp.com>
Cc:	dri-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: Intel 965G: i915_dispatch_cmdbuffer failed (2.6.19-rc2)

On Sat, Oct 14, 2006 at 11:15:23AM -0700, Keith Packard wrote:
> On Fri, 2006-10-13 at 15:45 -0400, Ryan Richter wrote:
> > I have a new Intel 965G board, and I'm trying to get DRI working.
> > Direct rendering is enabled, but all GL programs crash immediately.
> > The message 'DRM_I830_CMDBUFFER: -22' is printed on the tty, and the
> > kernel says:
> > 
> > [drm:i915_cmdbuffer] *ERROR* i915_dispatch_cmdbuffer failed
> 
> The 915 DRM validates commands sent to the card from the application to
> ensure they aren't directing the card to access memory outside of the
> graphics area. At present the module validates only 915/945 commands
> correctly and the 965 uses slightly different commands. I haven't walked
> over the entire GL library, but it seems possible that this error is
> being caused by the mis-validation of the command stream. We need to
> update the DRM driver to reflect the new commands, but in the meanwhile,
> you might try disabling the validation in the kernel (which will expose
> your system to a local root compromise) and seeing if that doesn't
> eliminate this message.

So do I want something like


static int do_validate_cmd(int cmd)
{
	return 1;
}

in i915_dma.c?

Thanks,
-ryan
-
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