[Intel-gfx] [PATCH] drm/i915: check ACTHD of all rings

[Eugeni Dodonov]

On Sun, Nov 27, 2011 at 15:58, Daniel Vetter <daniel.vetter at ffwll.ch> wrote:

> Otherwise hangcheck spuriously fires when running blitter/bsd-only
> workloads.
>
> Contrary to a similar patch by Ben Widawsky this does not check
> INSTDONE of the other rings. Chris Wilson implied that in a failure to
> detect a hang, most likely because INSTDONE was fluctuating. Thus only
> check ACTHD, which as far as I know is rather reliable. Also, blitter
> and bsd rings can't launch complex tasks from a single instruction
> (like 3D_PRIM on the render with complex or even infinite shaders).
>
> This fixes spurious gpu hang detection when running
> tests/gem_hangcheck_forcewake on snb/ivb.
>
> Signed-Off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
>

Reviewed-by: Eugeni Dodonov <eugeni.dodonov at intel.com>

-- 
Eugeni Dodonov
<http://eugeni.dodonov.net/>
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