[Bug 88561] [radeonsi][regression, bisected] Depth test/buffer issues in Portal

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bugzilla-daemon＠freedesktop.org

18 Jan 2015 18 Jan '15

5:34 p.m.

https://bugs.freedesktop.org/show_bug.cgi?id=88561

Bug ID: 88561 Summary: [radeonsi][regression,bisected] Depth test/buffer issues in Portal Product: Mesa Version: git Hardware: Other OS: All Status: NEW Severity: normal Priority: medium Component: Drivers/Gallium/radeonsi Assignee: dri-devel@lists.freedesktop.org Reporter: daniel@constexpr.org

Created attachment 112428 --> https://bugs.freedesktop.org/attachment.cgi?id=112428&action=edit Bad frame

With current Mesa master (commit 461103ef64858e9d81073fad1bd8222b70b2754b), (some) background geometry will be randomly drawn above foreground for some frames in Portal (also observed in the Portal mod Rexaura). It does not happen often and the same scene may be fine depending on what was loaded before or just randomness.

Bisecting blames commit 02ba7334d35cf8182048c17a149b16f18104c6bf Author: Marek Olšák marek.olsak@amd.com Date: Sun Jan 4 22:16:53 2015 +0100

radeonsi: don't use TC L2 for updating descriptors on SI

It's causing problems, because we mix uncached CP DMA with cached WRITE_DATA when updating the same memory.

The solution for SI is to use uncached access here, because CP DMA doesn't support cached access.

CIK will be handled in the next patch.

Reviewed-by: Michel Dänzer michel.daenzer@amd.com

Simply reverting this commit on master causes other rendering issues.

GPU: Radeon HD 7950 (OpenGL renderer string: Gallium 0.4 on AMD TAHITI) LLVM compiled from svn last week (r225584) GCC: 4.8.4 Kernel: Linux 3.18.2-gentoo Distro: Gentoo

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bugzilla-daemon＠freedesktop.org

18 Jan 18 Jan

5:35 p.m.

https://bugs.freedesktop.org/show_bug.cgi?id=88561

Daniel Scharrer daniel@constexpr.org changed:

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bugzilla-daemon＠freedesktop.org

5:36 p.m.

https://bugs.freedesktop.org/show_bug.cgi?id=88561

--- Comment #1 from Daniel Scharrer daniel@constexpr.org --- Created attachment 112429 --> https://bugs.freedesktop.org/attachment.cgi?id=112429&action=edit Good frame

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bugzilla-daemon＠freedesktop.org

4 Feb 4 Feb

11:56 a.m.

https://bugs.freedesktop.org/show_bug.cgi?id=88561

--- Comment #2 from Marek Olšák maraeo@gmail.com --- Does the issue occur in any freely-available Steam game like Team Fortress 2 and DOTA 2? If not, could you please create an apitrace file reproducing the issue?

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bugzilla-daemon＠freedesktop.org

5 Feb 5 Feb

7:26 a.m.

https://bugs.freedesktop.org/show_bug.cgi?id=88561

--- Comment #3 from Daniel Scharrer daniel@constexpr.org --- Created attachment 113176 --> https://bugs.freedesktop.org/attachment.cgi?id=113176&action=edit Vertex issues in TF2

I've re-tested Portal with updated mesa (commit 2335153ff2fae01d6294876a86d3eab59c6c4236) and kernel (3.18.5-gentoo) and the issue is still there.

There also seems to be a rendering regression with TF2 for me, but it looks different. Where in Portal objects appear in front of others that they should be behind of, in TF 2 they disappear entirely or appear to have garbage vertices. I haven't yet tested that the TF2 issues were introduced in the same commit.

I'll create apitraces of both later today.

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bugzilla-daemon＠freedesktop.org

3:33 p.m.

https://bugs.freedesktop.org/show_bug.cgi?id=88561

--- Comment #4 from Daniel Scharrer daniel@constexpr.org --- Here is an apitrace from portal that consistently triggers the bug for me (however, which frames are misrendered varies):

http://constexpr.org/tmp/Portal-radeonsi.trace.xz (193 MiB)

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bugzilla-daemon＠freedesktop.org

6 Feb 6 Feb

2:58 a.m.

https://bugs.freedesktop.org/show_bug.cgi?id=88561

Michel Dänzer michel@daenzer.net changed:

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bugzilla-daemon＠freedesktop.org

18 Feb 18 Feb

8:37 p.m.

https://bugs.freedesktop.org/show_bug.cgi?id=88561

--- Comment #5 from Daniel Scharrer daniel@constexpr.org --- For some reason this happens a lot less frequently now than it used to. With

Mesa git-8a71fd8 LLVM r229671 Kernel 3.19.0-gentoo

I need to re-run the apitrace multiple times before triggering the bug, while before there were many bad frames per run.

There are also other rendering errors in Portal that look more like the ones I get in TF2 - I guess those are more likely to be related to 88978.

I'm not sure what changed - the bug still happens infrequently when reverting to either Linux 3.18.6-gentoo or to Mesa git-2335153. Either way, the bug is still there, just a lot harder to reproduce now.

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bugzilla-daemon＠freedesktop.org

19 Feb 19 Feb

12:12 p.m.

https://bugs.freedesktop.org/show_bug.cgi?id=88561

--- Comment #6 from Marek Olšák maraeo@gmail.com --- Created attachment 113659 --> https://bugs.freedesktop.org/attachment.cgi?id=113659&action=edit possible fix

Please test this patch. It seems to fix the bug for the apitrace.

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bugzilla-daemon＠freedesktop.org

2:37 p.m.

https://bugs.freedesktop.org/show_bug.cgi?id=88561

--- Comment #7 from Lorenzo Bona lorenz.bona@gmail.com --- (In reply to Marek Olšák from comment #6)

...

Created attachment 113659 [details] [review] possible fix

Please test this patch. It seems to fix the bug for the apitrace.

Thank you Marek.

Your patch fix this bug https://bugs.freedesktop.org/show_bug.cgi?id=88978 too. Nice.

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bugzilla-daemon＠freedesktop.org

7:25 p.m.

https://bugs.freedesktop.org/show_bug.cgi?id=88561

--- Comment #8 from Daniel Scharrer daniel@constexpr.org --- Hi Marek,

the patch does improve things a lot: with it I can no longer reproduce any glitches in my Portal trace or in the Dota 2 trace from bug 88978 comment 2. However, in-game some glitches remain.

In Portal they are extremely infrequent with your patch, however disappearing terrain patches and garbage vertices are still relatively easy to reproduce in Team Fortress 2. (Maybe this fits belongs in bug 88978?) I tried to record an apitrace of TF2 but it does not replay correctly. Just loading up a practice map (I tried Dustbowl) and walking around should be enough.

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bugzilla-daemon＠freedesktop.org

20 Feb 20 Feb

3:25 a.m.

https://bugs.freedesktop.org/show_bug.cgi?id=88561

Daniel Scharrer daniel@constexpr.org changed:

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bugzilla-daemon＠freedesktop.org

3:26 a.m.

https://bugs.freedesktop.org/show_bug.cgi?id=88561

Daniel Scharrer daniel@constexpr.org changed:

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bugzilla-daemon＠freedesktop.org

8 May 8 May

11:09 p.m.

https://bugs.freedesktop.org/show_bug.cgi?id=88561

--- Comment #9 from Daniel Scharrer daniel@constexpr.org --- Created attachment 115651 --> https://bugs.freedesktop.org/attachment.cgi?id=115651&action=edit Junk rendered in The Talos Principle

This still happens in various Source engine games (and perhaps elsewhere), just not as frequently.

The The Talos Principle trace from bug 87278 comment 29 has some garbage being rendered (screenshot attached) that looks similar to what I get in Source engine games, but it is much easier to reproduce:

http://constexpr.org/tmp/Talos-radeonsi.3.trace.xz (147 MiB)

No idea of that is the same bug or even if the current Source engine issue is related to the original Portal bug I bisected in this bug.

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bugzilla-daemon＠freedesktop.org

23 May 23 May

8:47 p.m.

https://bugs.freedesktop.org/show_bug.cgi?id=88561

Daniel Scharrer daniel@constexpr.org changed:

--- Comment #10 from Daniel Scharrer daniel@constexpr.org --- I think Marek's patch fixed the original Portal issue I bisected in radeonsi. The remakning glitches seem to be caused by a LLVM regression. I've added the relevant information to bug #88978.

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bugzilla-daemon＠freedesktop.org