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

[Dave Airlie <airlied@linux.ie>]

Does the DRM git tree work would also be interesting,...

I haven't merged up Michel's drawable/blank changes for 2.6.19 as they 
were much too new for it, but do we have a backwards compat issue perhaps 
or something similiar?

Dave.

On Wed, 18 Oct 2006, Keith Whitwell wrote:

> This is all a little confusing as the driver doesn't really use that
> path in normal operation except for a single command - MI_FLUSH, which
> is shared between the architectures.  In normal operation the hardware
> does the validation for us for the bulk of the command stream.  If there
>  were missing functionality in that ioctl, it would be failing
> everywhere, not just in this one case.
>
> I guess the questions I'd have are
> 	- did the driver work before the kernel upgrade?
> 	- what path in userspace is seeing you end up in this ioctl?
> 	- and like Keith, what commands are you seeing?
>
> The final question is interesting not because we want to extend the
> ioctl to cover those, but because it will give a clue how you ended up
> there in the first place.
>
> Keith
>
> Keith Packard wrote:
> > On Tue, 2006-10-17 at 13:40 -0400, Ryan Richter wrote:
> >
> > > So do I want something like
> > >
> > >
> > > static int do_validate_cmd(int cmd)
> > > {
> > > 	return 1;
> > > }
> > >
> > > in i915_dma.c?
> >
> > that will certainly avoid any checks. Another alternative is to printk
> > the cmd which fails validation so we can see what needs adding here.
> >
> >
> >
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--
David Airlie, Software Engineer
http://www.skynet.ie/~airlied / airlied at skynet.ie
Linux kernel - DRI, VAX / pam_smb / ILUG

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