Bug 93357

Summary:	[HSW] Unreal Atlantis demo - occasional corruption
Product:	Mesa	Reporter:	Ilia Mirkin <imirkin>
Component:	Drivers/DRI/i965	Assignee:	Ian Romanick <idr>
Status:	RESOLVED FIXED	QA Contact:	Intel 3D Bugs Mailing List <intel-3d-bugs>
Severity:	normal
Priority:	medium
Version:	git
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:

Description Ilia Mirkin 2015-12-11 21:02:48 UTC

I tried to capture screenshots, but was unsuccessful. There are occasional blotches in the final images which look like random data, potentially resulting from blit fail, resolve fail, etc. These mostly only happen in the first and third/fourth scenes, not elsewhere. The corruption is reproducible (even looks similar between runs, so perhaps not random after all?).

mesa commit 79bff488bc
Haswell gpu: 00:02.0 VGA compatible controller [0300]: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller [8086:0412] (rev 06)

DRI3-enabled DDX (in case it matters).

Demo downloadable from https://wiki.unrealengine.com/Linux_Demos

Run like this: ./Atlantis-Linux-Shipping ResX=640 ResY=480

Comment 1 Ilia Mirkin 2016-02-09 19:49:36 UTC

This appears to be fixed by

commit 0aa4f99f562a05880a779707cbcd46be459863bf
Author: Francisco Jerez <currojerez@riseup.net>
Date:   Thu Jan 14 11:22:46 2016 -0800

    i965: Fix cache pollution race during L3 partitioning set-up.
    
    We need to split the stalling flush from the RO cache invalidation
    into a different PIPE_CONTROL command to make sure that the top of the
    pipe invalidation happens after any previous rendering is complete.
    Otherwise it's possible for previous rendering to pollute the L3 cache
    in the short window of time between RO invalidation and the completion
    of the stalling flush.  Fixes rendering artifacts on Unigine Heaven,
    Metro Last Light Redux and Metro 2033 Redux.
    
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=93540
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=93599
    Tested-by: Darius Spitznagel <d.spitznagel@goodbytez.de>
    Tested-by: Martin Peres <martin.peres@linux.intel.com>
    Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

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