[Bug 107861] [CI][BAT] [byt full-ppgtt] igt at gem_exec* - fail - Failed assertion: !"GPU hung"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107861

--- Comment #4 from Martin Peres <martin.peres at free.fr> ---
(In reply to Chris Wilson from comment #3)
> The hilarity
> 
> diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c
> b/drivers/gpu/drm/i915/intel_ringbuffer.c
> index 472939f5c18f..0f4e6b29c800 100644
> --- a/drivers/gpu/drm/i915/intel_ringbuffer.c
> +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
> @@ -1677,9 +1677,12 @@ static int switch_context(struct i915_request *rq)
>         GEM_BUG_ON(HAS_EXECLISTS(rq->i915));
>  
>         if (ppgtt) {
> +               int loops = (engine->id == BCS &&
> IS_VALLEYVIEW(engine->i915)) ? 32 : 1;
> +               do {
>                 ret = load_pd_dir(rq, ppgtt);
>                 if (ret)
>                         goto err;
> +               } while (--loops);
>  
>                 if (intel_engine_flag(engine) & ppgtt->pd_dirty_rings) {
>                         unwind_mm = intel_engine_flag(engine);
> @@ -1707,6 +1710,9 @@ static int switch_context(struct i915_request *rq)
> 
> is the most effective w/a so far. Pray I don't raise loops further.

Oh my :D

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