[Mesa-dev] [PATCH] i965: Fix GPU hangs when a blorp batch is the first thing to execute.

[Paul Berry]

On 2 May 2013 02:13, Chris Wilson <chris at chris-wilson.co.uk> wrote:

> On Wed, May 01, 2013 at 04:28:08PM -0700, Eric Anholt wrote:
> > The GPU apparently goes looking for constants even though there are no
> > shader stages enabled, and gets stuck because we haven't told it there
> are
> > no constants to collect.  If any other user of the 3D pipeline had run
> > (even the Render accel of the X server!) since power on, then the in-GPU
> > constant buffers would have been set up with some contents we didn't use,
> > and we would succeed.
> >
> > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=56416
> > NOTE: This is a candidate for the stable branches.
>
> The collorary to this is that DynamicStateUpperBound is programmed to an
> unsafe value and should be (0x7fff0000 | 1) for most of our hardware. The
> actual value to program requires information not easily reported by the
> kernel (just like the mappable aperture size).
> -Chris
>

Can you provide a documentation reference for why the value we're currently
programming (0xfffff001) is unsafe, and why 0x7fff0001 is correct?  I don't
see anything in the bspec.
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