On Wed, Apr 27, 2016 at 09:02:01AM +0100, Chris Wilson wrote: > Faced with sporadic machine hangs on gen7, that mimic the issue of > concurrent writes to the same cacheline and seem to start with > commit 9b9ed309 (drm/i915: Remove forcewake dance from seqno/irq > barrier on legacy gen6+), let us restore the spinlock around the mmio > read. > > Fixes: 9b9ed3093613288247a27a55a6dd07f1222150f1 > Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> > Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxx> Testcase: igt/gem_concurrent_blit #crw I haven't been able to narrow this down to a simpler scenario. Still not happy that I understand how we are triggering the erratum with this read, but that does appear to be the case. -Chris -- Chris Wilson, Intel Open Source Technology Centre _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
