Bug 107398

Summary:	[CI][BAT] igt@drv_selftest@live_objects - dmesg-fail - igt_partial_tiling failed with error -22
Product:	DRI	Reporter:	Martin Peres <martin.peres>
Component:	DRM/Intel	Assignee:	Intel GFX Bugs mailing list <intel-gfx-bugs>
Status:	CLOSED FIXED	QA Contact:	Intel GFX Bugs mailing list <intel-gfx-bugs>
Severity:	normal
Priority:	high	CC:	intel-gfx-bugs
Version:	XOrg git
Hardware:	Other
OS:	All
Whiteboard:	ReadyForDev
i915 platform:	CNL, ICL	i915 features:	GEM/Other

Description Martin Peres 2018-07-27 11:03:01 UTC

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_4553/fi-cnl-psr/igt@drv_selftest@live_objects.html

https://intel-gfx-ci.01.org/tree/drm-tip/CI_DRM_4552/fi-icl-u/igt@drv_selftest@live_objects.html

[  609.719934] Partial view for 3739 [155] (offset=3584, size=256 [256, row size 0], fence=-1, tiling=0, stride=0) misalignment, expected write to page (3739 + 0 [0xe9b000]) of 0xe9b, found 0xc31e7b
[  609.720094] i915/i915_gem_object_live_selftests: igt_partial_tiling failed with error -22
[  609.956121] i915: probe of 0000:00:02.0 failed with error -22

Comment 1 Martin Peres 2018-07-27 11:04:10 UTC

Setting to high since it affects CNL and ICL, but it only affects one test, so no need to go to highest.

Comment 2 Chris Wilson 2018-07-27 11:17:11 UTC

It's a pretty severe failure. That reading from the gtt is broken may impact virtually any test if the timing is against us. More interesting is the coherency results, which suggest that we need to mark cnl+ as having an incoherent gtt.

Comment 3 Chris Wilson 2018-08-01 13:18:42 UTC

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

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