[Bug 103556] [SKL] Unigine Heaven 4.0 fails to GPU hangs

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103556

--- Comment #31 from Lionel Landwerlin <lionel.g.landwerlin at linux.intel.com> ---
(In reply to Eero Tamminen from comment #30)
> The hang issues I've filed (this and compute) one are too rare/random to be
> bisectable.
> 
> In last few days, I got one hang in Heaven on SKL GT2 two days ago, one hang
> on SKL GT3e yesterday (and one hang in CarChase on SKL GT4e yesterday). 
> This is from doing 3 runs, few times on different gfx stack setups every
> day, on each of the machines.
> 
> On other machines than SKL, they're much rarer (attached BDW hang is the
> only one I've noticed).

I'm starting to think we might have a problem with the tracking of the aperture
available.
By default it seems to be set to 4Gb, but that doesn't make sense to me on
gen8+, I would expect 2^48 (48bits of address space).
Reducing that number to like 200Mb in i965 triggers all kind of random hangs
with Heaven.

4Gb might be big enough to only trigger issues after a long time.
It would explain the difficulty to reproduce.

Anyway that's my current track, I'll try to understand this better with Ken.

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