[Bug 88978] [bisected] [SI Scheduler] Graphical corruption in Dota 2

[Bug 88978] [bisected] [SI Scheduler] Graphical corruption in Dota 2

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https://bugs.freedesktop.org/show_bug.cgi?id=88978

            Bug ID: 88978
           Summary: [bisected] [SI Scheduler] Graphical corruption in Dota
                    2
           Product: Mesa
           Version: git
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: commendsarnex@gmail.com
        QA Contact: dri-devel@lists.freedesktop.org
                CC: tstellar@gmail.com

Hi guys. If I use LLVM git, I get these graphical glitches in Dota 2 native.

https://i.imgur.com/I4vyWFt.jpg

The bug has been bisected to LLVM: 51a3c27d6e0c66cc8d2d1da8e9205fec7b74ca5c
 R600/SI: Define a schedule model and enable the generic machine scheduler


I'm using Mesa git, Kernel 3.18.5 and Linux Mint. 

Thanks alot,

sarnex

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https://bugs.freedesktop.org/show_bug.cgi?id=88978

--- Comment #1 from smoki <smoki00790@gmail.com> ---
 Which card is used? I already saw those artifacts in bug 88758 and tried to
reproduce it on Kabini with two apitraces i have, but i can't. Those are from
bug 67887 and bug 88301.

 Can you also reproduce artifacts with any of those two? Or made new one, might
be some recent game update only show an issue or it arise only with particular
settings.

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[Bug 88978] [bisected] [SI Scheduler] Graphical corruption in Dota 2

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https://bugs.freedesktop.org/show_bug.cgi?id=88978

--- Comment #2 from sarnex <commendsarnex@gmail.com> ---
Hi smoki. I am on a Radeon HD 7950(TAHITI). If I try the trace from
https://bugs.freedesktop.org/show_bug.cgi?id=67887, I DO see the same graphical
glitches that I get. 


Here an apitrace I just took:
https://idontevenlift.no-ip.org/sarnex_dota_linux.trace.xz


The other apitrace is too large, I'll try it tomorrow.

Thanks,
sarnex

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[Bug 88978] [bisected] [SI Scheduler] Graphical corruption in Dota 2

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https://bugs.freedesktop.org/show_bug.cgi?id=88978

--- Comment #3 from smoki <smoki00790@gmail.com> ---
 OK, thanks for trace, but i can't reproduce it either with your trace on
Kabini. 

 So as it happen on R7 265 and HD 7950, i guess this is likely GCN 1.0 only
bug.

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--- Comment #4 from Tom Stellard <tstellar@gmail.com> ---
(In reply to sarnex from comment #0)
> Hi guys. If I use LLVM git, I get these graphical glitches in Dota 2 native.
> 
> https://i.imgur.com/I4vyWFt.jpg
> 
> The bug has been bisected to LLVM: 51a3c27d6e0c66cc8d2d1da8e9205fec7b74ca5c
>  R600/SI: Define a schedule model and enable the generic machine scheduler
> 
> 
> I'm using Mesa git, Kernel 3.18.5 and Linux Mint. 
> 
> Thanks alot,
> 
> sarnex

Can you run the game with the  environment variable:
R600_DEBUG=ps,vs,gs and post the output.

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https://bugs.freedesktop.org/show_bug.cgi?id=88978

--- Comment #5 from sarnex <commendsarnex@gmail.com> ---

(In reply to Tom Stellard from comment #4)
> (In reply to sarnex from comment #0)
> > Hi guys. If I use LLVM git, I get these graphical glitches in Dota 2 native.
> > 
> > https://i.imgur.com/I4vyWFt.jpg
> > 
> > The bug has been bisected to LLVM: 51a3c27d6e0c66cc8d2d1da8e9205fec7b74ca5c
> >  R600/SI: Define a schedule model and enable the generic machine scheduler
> > 
> > 
> > I'm using Mesa git, Kernel 3.18.5 and Linux Mint. 
> > 
> > Thanks alot,
> > 
> > sarnex
> 
> Can you run the game with the  environment variable:
> R600_DEBUG=ps,vs,gs and post the output.

Hi Tom, thanks for replying.

The log is here, since it's too big to be an attachment. Skip to near the end
to see the in-game bugged time, the beginning is mostly the menu.

Log: http://paste.ubuntu.com/10075950/

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[Bug 88978] [bisected] [SI Scheduler] Graphical corruption in Dota 2

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https://bugs.freedesktop.org/show_bug.cgi?id=88978

--- Comment #6 from Tom Stellard <tstellar@gmail.com> ---
(In reply to sarnex from comment #5)
> (In reply to Tom Stellard from comment #4)
> > (In reply to sarnex from comment #0)
> > > Hi guys. If I use LLVM git, I get these graphical glitches in Dota 2 native.
> > > 
> > > https://i.imgur.com/I4vyWFt.jpg
> > > 
> > > The bug has been bisected to LLVM: 51a3c27d6e0c66cc8d2d1da8e9205fec7b74ca5c
> > >  R600/SI: Define a schedule model and enable the generic machine scheduler
> > > 
> > > 
> > > I'm using Mesa git, Kernel 3.18.5 and Linux Mint. 
> > > 
> > > Thanks alot,
> > > 
> > > sarnex
> > 
> > Can you run the game with the  environment variable:
> > R600_DEBUG=ps,vs,gs and post the output.
> 
> Hi Tom, thanks for replying.
> 
> The log is here, since it's too big to be an attachment. Skip to near the
> end to see the in-game bugged time, the beginning is mostly the menu.
> 
> Log: http://paste.ubuntu.com/10075950/

Thanks, would you also be able to get a dump using the last good commit.

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https://bugs.freedesktop.org/show_bug.cgi?id=88978

--- Comment #7 from sarnex <commendsarnex@gmail.com> ---
(In reply to Tom Stellard from comment #6)
> (In reply to sarnex from comment #5)
> > (In reply to Tom Stellard from comment #4)
> > > (In reply to sarnex from comment #0)
> > > > Hi guys. If I use LLVM git, I get these graphical glitches in Dota 2 native.
> > > > 
> > > > https://i.imgur.com/I4vyWFt.jpg
> > > > 
> > > > The bug has been bisected to LLVM: 51a3c27d6e0c66cc8d2d1da8e9205fec7b74ca5c
> > > >  R600/SI: Define a schedule model and enable the generic machine scheduler
> > > > 
> > > > 
> > > > I'm using Mesa git, Kernel 3.18.5 and Linux Mint. 
> > > > 
> > > > Thanks alot,
> > > > 
> > > > sarnex
> > > 
> > > Can you run the game with the  environment variable:
> > > R600_DEBUG=ps,vs,gs and post the output.
> > 
> > Hi Tom, thanks for replying.
> > 
> > The log is here, since it's too big to be an attachment. Skip to near the
> > end to see the in-game bugged time, the beginning is mostly the menu.
> > 
> > Log: http://paste.ubuntu.com/10075950/
> 
> Thanks, would you also be able to get a dump using the last good commit.

Hi Tom,

Here is the log from the commit directly before R600/SI: Define a schedule
model and enable the generic machine scheduler, and it has no graphical issues

Log: http://paste.ubuntu.com/10143733/

Thanks again,
sarnex

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https://bugs.freedesktop.org/show_bug.cgi?id=88978

--- Comment #8 from Daniel Scharrer <daniel@constexpr.org> ---
The Mesa patch from bug 88561 comment 6 fixes this for me - at least the
glitches with the posted apitrace.

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--- Comment #9 from sarnex <commendsarnex@gmail.com> ---
(In reply to Daniel Scharrer from comment #8)
> The Mesa patch from bug 88561 comment 6 fixes this for me - at least the
> glitches with the posted apitrace.

Hi Daniel, 

Thanks for the information. The patch from Marek significantly reduces the
number of artifacts in Dota 2, but it does not completely fix the issue and I
still see a few artifacts per second. It seems that this bug and the Portal bug
are related, but there is still an underlying bug somewhere.

Thanks,
sarnex

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Daniel Scharrer <daniel@constexpr.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |https://bugs.freedesktop.or
                   |                            |g/show_bug.cgi?id=88561

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--- Comment #10 from sarnex <commendsarnex@gmail.com> ---
This issue is still present on LLVM git and Mesa git, although the frequency of
the corruption is significantly lowered with Marek's patch from
https://bugs.freedesktop.org/show_bug.cgi?id=88561#c6

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--- Comment #11 from Daniel Scharrer <daniel@constexpr.org> ---
Created attachment 115995
  --> https://bugs.freedesktop.org/attachment.cgi?id=115995&action=edit
patch to disable the machine scheduler for SI

I can confirm that these these glitches are still present on current LLVM +
Mesa git with a 7950 (TAHITI).

Glitches happen in various games with different engines (Source, Unity, …).
Here is a trace of The Talos Principle (first posted in bug #88561 comment 9),
that still produces more than just occasional glitches (even with Marek's
patch):
 http://constexpr.org/tmp/Talos-radeonsi.3.trace.xz (147 MiB)

Like sarnex, I have bisected this to LLVM
51a3c27d6e0c66cc8d2d1da8e9205fec7b74ca5c (r227461).
I had to revert b8797a7 and a99a16a in current Mesa git for it to build against
that LLVM revision.

Some Source engine games (L4D2, Nuclear Dawn, maybe others) don't just produce
graphical glitches but also frequently lock up the GPU since a later change to
the machine scheduler (r233366) - see bug #90378.

Disabling the machine scheduler for SI on current LLVM (see attached patch)
also fixes both the lockups an graphical glitches.

Additionally, using R600_DEBUG=switch_on_eop with unpatched LLVM also works
around both the graphical glitches and and GPU lockups.

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--- Comment #12 from Daniel Scharrer <daniel@constexpr.org> ---
Created attachment 115996
  --> https://bugs.freedesktop.org/attachment.cgi?id=115996&action=edit
R600_DEBUG=ps,vs,gs output for the Talos trace with r227460 (no lockups)

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--- Comment #13 from Daniel Scharrer <daniel@constexpr.org> ---
Created attachment 115997
  --> https://bugs.freedesktop.org/attachment.cgi?id=115997&action=edit
R600_DEBUG=ps,vs,gs output for the Talos trace with r227461 (lockups)

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--- Comment #14 from Tom Stellard <tstellar@gmail.com> ---
Can you post your dmesg log too?

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--- Comment #15 from Daniel Scharrer <daniel@constexpr.org> ---
Created attachment 116176
  --> https://bugs.freedesktop.org/attachment.cgi?id=116176&action=edit
dmesg log

Here is the dmesg log with Linux 4.0.4-gentoo and LLVM patched to disable the
machine scheduler for SI, after replaying both sarnex' and my trace. I don't
have an unpatched LLVM build right now, but don't remember the dmesg output
being different.

The log is compressed because there are lots of GPU faults at the end (bug
#87278) which pushed the uncompressed log over the attachment size limit - not
sure if you wanted those or just the startup part.

Bug #90378 has the dmesg output for L4D2 including GPU lockups with an
unpatched (but older revision on) LLVM and 4.0.1-gentoo in attachment 115653.

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--- Comment #16 from Tom Stellard <tstellar@gmail.com> ---
(In reply to Daniel Scharrer from comment #15)
> Created attachment 116176 [details]
> dmesg log
> 
> Here is the dmesg log with Linux 4.0.4-gentoo and LLVM patched to disable
> the machine scheduler for SI, after replaying both sarnex' and my trace. I
> don't have an unpatched LLVM build right now, but don't remember the dmesg
> output being different.
> 
> The log is compressed because there are lots of GPU faults at the end (bug
> #87278) which pushed the uncompressed log over the attachment size limit -
> not sure if you wanted those or just the startup part.
> 
> Bug #90378 has the dmesg output for L4D2 including GPU lockups with an
> unpatched (but older revision on) LLVM and 4.0.1-gentoo in attachment 115653
> [details].

Would you be able to post an API trace of one of the games that is locking up?

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--- Comment #17 from Tom Stellard <tstellar@gmail.com> ---
(In reply to Tom Stellard from comment #16)
> (In reply to Daniel Scharrer from comment #15)
> > Created attachment 116176 [details]
> > dmesg log
> > 
> > Here is the dmesg log with Linux 4.0.4-gentoo and LLVM patched to disable
> > the machine scheduler for SI, after replaying both sarnex' and my trace. I
> > don't have an unpatched LLVM build right now, but don't remember the dmesg
> > output being different.
> > 
> > The log is compressed because there are lots of GPU faults at the end (bug
> > #87278) which pushed the uncompressed log over the attachment size limit -
> > not sure if you wanted those or just the startup part.
> > 
> > Bug #90378 has the dmesg output for L4D2 including GPU lockups with an
> > unpatched (but older revision on) LLVM and 4.0.1-gentoo in attachment 115653 [details]
> > [details].
> 
> Would you be able to post an API trace of one of the games that is locking
> up?

Nevermind, I think the one you posted already should be enough.

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--- Comment #18 from Tom Stellard <tstellar@gmail.com> ---
Created attachment 116227
  --> https://bugs.freedesktop.org/attachment.cgi?id=116227&action=edit
sdiff output for suspected bad shader

Here is a dump from sdiff of a good shader with no GPU protection faults (left
side) and a bad shader that causes GPU protection faults (right side).  Search
for the pipe character '|' to find the only difference between the two shaders.

I'm not sure yet why this difference would lead to GPU protection faults.

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--- Comment #19 from sarnex <commendsarnex@gmail.com> ---
I cannot reproduce this on Mesa master, it must have been fixed with radeonsi:
completely rework updating descriptors without CP DMA

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[Bug 88978] [bisected] [SI Scheduler] Graphical corruption in Dota 2

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=88978

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #20 from Michel Dänzer <michel@daenzer.net> ---
Resolving per comment 19, thanks for the update.

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