[Bug 63921] [snb] GTT mapping fails after GPU hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=63921

--- Comment #9 from Nicolas Hillegeer <nicolashillegeer at gmail.com> ---
(In reply to comment #8)
> (In reply to comment #7)
> > More interesting fail:
> > 
> > [ 4366.361686] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed...
> > GPU hung
> > [ 4366.361694] [drm] capturing error event; look for more information
> > in/sys/kernel/debug/dri/0/i915_error_state
> > [ 4366.871407] [drm:i915_reset] *ERROR* Failed to reset chip.
> > [ 4376.364660] [drm:i915_gem_wait_for_error] *ERROR* Timed out waiting for
> > the gpu reset to complete
> > 
> > 
> > Pity we can't get the i915_error_state back, but if you can isolate the
> > cause of the hang that will be enough for the libva (or whoever to work on).
> 
> Please try this specifically for the reset hang:
> 
> diff --git a/drivers/gpu/drm/i915/i915_gem.c
> b/drivers/gpu/drm/i915/i915_gem.c
> index 8539177..df9dfa5 100644
> --- a/drivers/gpu/drm/i915/i915_gem.c
> +++ b/drivers/gpu/drm/i915/i915_gem.c
> @@ -4036,6 +4036,10 @@ i915_gem_init_hw(struct drm_device *dev)
>                 I915_WRITE(GEN7_MSG_CTL, temp);
>         }
>  
> +       DRM_ERROR("Forcing no wait on PCH (SNB ONLY)\n");
> +       I915_WRITE(ILK_DISPLAY_CHICKEN2,
> +                  I915_READ(ILK_DISPLAY_CHICKEN2) & ~(0x3 << 14));
> +
>         i915_gem_l3_remap(dev);
>  
>         i915_gem_init_swizzling(dev);

(In reply to comment #8)
> (In reply to comment #7)
> > More interesting fail:
> > 
> > [ 4366.361686] [drm:i915_hangcheck_hung] *ERROR* Hangcheck timer elapsed...
> > GPU hung
> > [ 4366.361694] [drm] capturing error event; look for more information
> > in/sys/kernel/debug/dri/0/i915_error_state
> > [ 4366.871407] [drm:i915_reset] *ERROR* Failed to reset chip.
> > [ 4376.364660] [drm:i915_gem_wait_for_error] *ERROR* Timed out waiting for
> > the gpu reset to complete
> > 
> > 
> > Pity we can't get the i915_error_state back, but if you can isolate the
> > cause of the hang that will be enough for the libva (or whoever to work on).
> 
> Please try this specifically for the reset hang:
> 
> diff --git a/drivers/gpu/drm/i915/i915_gem.c
> b/drivers/gpu/drm/i915/i915_gem.c
> index 8539177..df9dfa5 100644
> --- a/drivers/gpu/drm/i915/i915_gem.c
> +++ b/drivers/gpu/drm/i915/i915_gem.c
> @@ -4036,6 +4036,10 @@ i915_gem_init_hw(struct drm_device *dev)
>                 I915_WRITE(GEN7_MSG_CTL, temp);
>         }
>  
> +       DRM_ERROR("Forcing no wait on PCH (SNB ONLY)\n");
> +       I915_WRITE(ILK_DISPLAY_CHICKEN2,
> +                  I915_READ(ILK_DISPLAY_CHICKEN2) & ~(0x3 << 14));
> +
>         i915_gem_l3_remap(dev);
>  
>         i915_gem_init_swizzling(dev);

@Chris:

I'm not sure I'll deduce the cause of the hang by just repeating my testing
(i.e.: playing a lot of movies, often multiple at a time), for SNA it seems to
happen about every hour, with UXA it takes quite a bit longer. I'm trying UXA
again and it's been going for 4 hours now. I hope I get some genious insight in
the near future :).

@Ben:

I'll see what I can do! That's some crazy magic right there. I'll report
tomorrow with the results. Is this codepath supposed to be called with UXA, SNA
or both? Because I will start testing with SNA, since that seems to crash
earlier and more predictably.

Thanks!
Nicolas

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