[Bug 73418] New: OpenCL hangs graphics on CAYMAN

[Bug 73418] New: OpenCL hangs graphics on CAYMAN

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=73418

          Priority: medium
            Bug ID: 73418
          Assignee: dri-devel@lists.freedesktop.org
           Summary: OpenCL hangs graphics on CAYMAN
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: v10lator@myway.de
          Hardware: Other
            Status: NEW
           Version: 10.0
         Component: Drivers/DRI/R600
           Product: Mesa

Created attachment 91722
  --> https://bugs.freedesktop.org/attachment.cgi?id=91722&action=edit
dmesg snippet from mesa 10.0.1

When I try to run some OpenCL code from within X the screen freezes, goes
black, goes on again while still frozen, ... this repeats a few times till it
won't come back again and all I have left is my monitor in standby and my
keyboard not reacting to any input.

When I try to run some OpenCL code from a console (Cntrl + Alt + F1) and go
back to X while the OpenCL code is still running it's the same as above.

When I try to run some OpenCL code from a console and go back to X after the
OpenCL code is finished I have a black monitor with my mouse cursor (I'm even
able to move it) for a few seconds, then my desktop is back. While it produces
the black screen (with mouse cursor) there's also GPU hang logged to dmesg.

Reproducable with bfgminer or the tests from
http://cgit.freedesktop.org/~tstellar/opencl-example/ with mesa 10.0.1 as well
as 10.1 (git-646c16a).

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[Bug 73418] OpenCL hangs graphics on CAYMAN

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=73418

--- Comment #1 from Thomas Rohloff <v10lator@myway.de> ---
Created attachment 91723
  --> https://bugs.freedesktop.org/attachment.cgi?id=91723&action=edit
dmesg snippet from mesa 10.1

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[Bug 73418] OpenCL hangs graphics on CAYMAN

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https://bugs.freedesktop.org/show_bug.cgi?id=73418

Marek Olšák <maraeo@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|Drivers/DRI/R600            |Drivers/Gallium/r600

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[Bug 73418] OpenCL hangs graphics on CAYMAN

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https://bugs.freedesktop.org/show_bug.cgi?id=73418

--- Comment #2 from Tom Stellard <tstellar@gmail.com> ---
Do you run into the same issues if you run OpenCL programs while X isn't
running?

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[Bug 73418] OpenCL hangs graphics on CAYMAN

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https://bugs.freedesktop.org/show_bug.cgi?id=73418

--- Comment #3 from christophe.choquet2@free.fr ---
- If I run the OpenCL hello_world without starting the X server, it is running
fine. No hangs even if I run it multiple times. X starts properly after.

- If I run hello_world within an X session, it hangs ever two tries.

- If I start X server and run it in console, black screen/hang when returning
to the X session

With ddd, I have tracked the issue down to the point it hangs:
(gdb) bt
#0  radeon_drm_ws_queue_cs (ws=0x60b2e0, cs=0x7ffff7f6a010) at
radeon_drm_winsys.c:555
#1  0x00007ffff293a7e8 in radeon_drm_cs_flush (rcs=0x7ffff7f6a010, flags=2,
cs_trace_id=0) at radeon_drm_cs.c:567
#2  0x00007ffff2950f6d in r600_context_flush (ctx=0x6251d0, flags=2) at
r600_hw_context.c:356
#3  0x00007ffff2951f3b in r600_flush (ctx=0x6251d0, flags=0) at r600_pipe.c:88
#4  0x00007ffff2952056 in r600_flush_gfx_ring (ctx=0x6251d0, flags=0) at
r600_pipe.c:120
#5  0x00007ffff2952034 in r600_flush_from_st (ctx=0x6251d0,
fence=0x7fffffffb390, flags=0) at r600_pipe.c:115
#6  0x00007ffff6c0718a in clover::command_queue::flush (this=0x642000) at
core/queue.cpp:48
#7  0x00007ffff6c182f2 in clover::hard_event::wait (this=0xaca350) at
core/event.cpp:124
#8  0x00007ffff6c60811 in clFinish (d_q=0x642008) at api/event.cpp:268
#9  0x000000000040136c in main (argc=1, argv=0x7fffffffdd58) at
hello_world.c:193

If I run line 563 pipe_semaphore_signal(&ws->cs_queued) the system hang.

The calling parameters are in a mesa dev list post.

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[Bug 73418] OpenCL hangs graphics on CAYMAN

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https://bugs.freedesktop.org/show_bug.cgi?id=73418

--- Comment #4 from Tom Stellard <tstellar@gmail.com> ---
Thanks for the information, this is a well known bug on Cayman.  I will try to
investigate further.

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[Bug 73418] OpenCL hangs graphics on CAYMAN

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https://bugs.freedesktop.org/show_bug.cgi?id=73418

--- Comment #5 from Tom Stellard <tstellar@gmail.com> ---
Created attachment 92744
  --> https://bugs.freedesktop.org/attachment.cgi?id=92744&action=edit
Possible Fix

Does this patch help?

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[Bug 73418] OpenCL hangs graphics on CAYMAN

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https://bugs.freedesktop.org/show_bug.cgi?id=73418

--- Comment #6 from Thomas Rohloff <v10lator@myway.de> ---
(In reply to comment #5)
> Does this patch help?

Yes, this seems to do the trick. But as it's a work-around I'm unsure about
closing this as fixed.

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[Bug 73418] OpenCL hangs graphics on CAYMAN

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https://bugs.freedesktop.org/show_bug.cgi?id=73418

--- Comment #7 from Alex Deucher <agd5f@yahoo.com> ---
(In reply to comment #6)
> (In reply to comment #5)
> > Does this patch help?
> 
> Yes, this seems to do the trick. But as it's a work-around I'm unsure about
> closing this as fixed.

I don't think it's a workaround, I think it's actually the way the hw is
supposed to be programmed for compute.

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[Bug 73418] OpenCL hangs graphics on CAYMAN

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https://bugs.freedesktop.org/show_bug.cgi?id=73418

Thomas Rohloff <v10lator@myway.de> changed:

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

--- Comment #8 from Thomas Rohloff <v10lator@myway.de> ---
(In reply to comment #7)
> I don't think it's a workaround, I think it's actually the way the hw is
> supposed to be programmed for compute.

Oh, it was a bit late yesterday, I thought the patch added the lines containing
"Work-around for flushing problems with compute shaders on Cayman" but it
removes them. My fault, sorry.

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[Bug 73418] OpenCL hangs graphics on CAYMAN

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https://bugs.freedesktop.org/show_bug.cgi?id=73418

Tom Stellard <tstellar@gmail.com> changed:

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

--- Comment #9 from Tom Stellard <tstellar@gmail.com> ---
Let's leave this bug open until the fix is committed upstream.

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[Bug 73418] OpenCL hangs graphics on CAYMAN

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https://bugs.freedesktop.org/show_bug.cgi?id=73418

Tom Stellard <tstellar@gmail.com> changed:

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

--- Comment #10 from Tom Stellard <tstellar@gmail.com> ---
Fix committed as d51dbe048afd2131eb3675e9cd868ce73325a61d

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[Bug 73418] OpenCL hangs graphics on CAYMAN

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https://bugs.freedesktop.org/show_bug.cgi?id=73418

--- Comment #11 from chris <christophe_choquet@hotmail.com> ---
Worked for me too with dev branch.
Thanks!

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