https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_4554/fi-icl-u/igt@drv_selftest@live_coherency.html [ 605.873903] Value[0/7] mismatch, (overwrite with cpu) wrote [gtt] a3b52fe8 read [cpu] 5c4ad017 (inverse 5c4ad017), at offset 5dc [ 605.873953] i915/i915_gem_coherency_live_selftests: igt_gem_coherency failed with error -22 [ 605.975469] i915: probe of 0000:00:02.0 failed with error -22
commit 21eb1850fa0bd0a9b729bf3708da78888433027f (HEAD -> drm-intel-next-queued, drm-intel/for-linux-next, drm-intel/drm-intel-next-queued) Author: Chris Wilson <chris@chris-wilson.co.uk> Date: Wed Aug 1 11:47:21 2018 +0100 drm/i95: Mark GGTT as incoherent for gen10+ The evidence suggests that we need to start treating writes via GGTT as incoherent for gen10+, that is that they are internally buffered and not immediately visible via a read along a different physical path. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107398 Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107400 Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107435 Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com> Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180801104721.4030-1-chris@chris-wilson.co.uk
Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.