[Bug 109072] GPU hang in blender 2.80

[bugzilla-daemon at freedesktop.org]

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

--- Comment #22 from Lionel Landwerlin <lionel.g.landwerlin at linux.intel.com> ---
Managed to get some understanding about what's going on here :

Since we switch to softpin all buffers, that means the vertex buffers aren't
restricted to the low 4Gb region. So we run into the same HW issue as before.
In effect softpinning VBOs nullifys the 32bit reloc flag in
genX(emit_vertex_buffer_state) (genX_state_upload.c).

I'm not quite sure how to fix this apart from disabling softpinning on all
buffer objects, because buffers can be reused from one type another (transform
feedback output into vertices for instance)...

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