[Intel-gfx] [PATCH v1] drm/i915/guc: Fix a fw content lost issue after it is evicted

[Chris Wilson]

On Wed, Nov 25, 2015 at 09:40:45AM +0100, Daniel Vetter wrote:
> Hm it's not just batches but any object with relocs. Could this explain
> the oddball libva/uxa hang? Stuff like "after playing $game for hours my
> desktop looked funny", but not for tiling issues.

Possible, but with libva having its own issues with not marking GPU
writes, only time will tell. I say batches because in modern code, only
the batch has the reloc. In UXA and mesa, even the auxiliary buffers with
the relocs are reallocated with each batch.

There's only one swap related corruption issue on gen4, for which we
also know the machine had bad swizzle detection, and there is another
swap related bug on gen2, but neither are actually susceptible to this
bug. I don't have any strong candidates for an eureka moment.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre