[Bug 107715] [CI][BAT] igt at gem_sync@basic-many-each - fail - Failed assertion: !"GPU hung"

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107715

--- Comment #3 from Chris Wilson <chris at chris-wilson.co.uk> ---
ARGH. The answer is I never pushed

    drm/i915/ringbuffer: Delay after invalidating gen6+ xcs

    During stress testing of full-ppgtt (on Baytrail at least), we found
    that the invalidation around a context/mm switch was insufficient (writes
    would go astray). Adding a second MI_FLUSH_DW barrier prevents this, but
    it is unclear as to whether this is merely a delaying tactic or if it is
    truly serialising with the TLB invalidation. Either way, it is
    empirically required.

    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
    Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
    Cc: Mika Kuoppala <mika.kuoppala at linux.intel.com>
    Cc: Matthew Auld <matthew.william.auld at gmail.com>
    Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>

-- 
You are receiving this mail because:
You are on the CC list for the bug.
You are the assignee for the bug.
You are the QA Contact for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.freedesktop.org/archives/intel-gfx-bugs/attachments/20180828/41889d83/attachment.html>