[Bug 107862] [CI][DRMTIP] igt@(gem_mmap_gtt/coherency) - fail - Failed assertion: gtt[1024*i] == ~i

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107862

--- Comment #1 from Chris Wilson <chris at chris-wilson.co.uk> ---
The weird with these is that it looks like buffering on the read; it's not the
write via the GTT being incoherent with the read via WC, in these cases it's
the write via WC not being immediately visible via GTT. That upsets all my
understanding of PCI ordering rules and mental models for how the GTT works.

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