[Bug 109072] GPU hang in blender 2.80

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109072

--- Comment #20 from Andrii Kryvytskyi <andrii.kryvytskyi.gl at gmail.com> ---
Bisected to commit: a363bb2cd0e2a141f2c60be005009703bffcbe4e
Author: Kenneth Graunke <kenneth at whitecape.org>
Date:   Tue Apr 10 01:18:25 2018 -0700

    i965: Allocate VMA in userspace for full-PPGTT systems.

    This patch enables soft-pinning of all buffers, allowing us to skip
    relocation processing entirely.  All systems with full PPGTT and > 4GB
    of VMA should gain these benefits.  This should be most Gen8+.

    Unfortunately, this excludes a few systems:
    - Cherryview (only has 32-bit addressing, despite 48-bit pointers)
    - Broadwell with a 32-bit kernel
    - Anybody running pre-4.5 kernel.

    We may enable it for Cherryview in the future, but it would require
    some tweaks to the memory zone.

    Reviewed-by: Jordan Justen <jordan.l.justen at intel.com>

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