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

[Daniel Vetter]

On Wed, Nov 25, 2015 at 09:02:20AM +0000, Chris Wilson wrote:
> 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.

Ah, I didn't realize/forgot that UXA doesn't reuse the indirect state.

> 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.

Was just a thought really.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch