[Bug 104736] Kernel panic with agd5's drm-next-4.17-wip & GFX8/Polaris10/Ellesmere/Rx-480-8GiB

[Bug 104736] Kernel panic with agd5's drm-next-4.17-wip & GFX8/Polaris10/Ellesmere/Rx-480-8GiB

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https://bugs.freedesktop.org/show_bug.cgi?id=104736

            Bug ID: 104736
           Summary: Kernel panic with agd5's drm-next-4.17-wip &
                    GFX8/Polaris10/Ellesmere/Rx-480-8GiB
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: robink@creosotehill.org

Created attachment 136904
  --> https://bugs.freedesktop.org/attachment.cgi?id=136904&action=edit
Serial kernel console for Panic/BUG/OOPS bug on Kaveri+GFX8

Hi-
    I'm having issues with bringing up a kennel on an AMD Kaveri (A10-7850K w/
R7 iGPU disabled) using a Radeon Rx 480 8GiB.  I'm using (at the time of this
writing) the latest commit from agd5f's drm-next-4.17-wip branch (commit
006a62b26fbb0b7dcd8061f83889e0514ea42d17 ('drm/ttm: Don't unreserve swapped BOs
that were previously reserved')).
    When bringing up the kernel, it acts like it's initializing the
(DisplayPort-connected) display, but then the screen blacks out and the display
finally goes to sleep.  I've attached a kernel log (grabbed from a serial
connection (the kernel panics too soon to bring up the various network devices,
and thus the network console)), which hopefully has enough verbosity to be
useful.  It's also available at
https://gist.github.com/Haifen/f783d5f6b2ab3d30805d9f5315b7c675
    Please let me know if there's any more information you require.

        -Robin K.

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[Bug 104736] Kernel panic with agd5's drm-next-4.17-wip & GFX8/Polaris10/Ellesmere/Rx-480-8GiB

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https://bugs.freedesktop.org/show_bug.cgi?id=104736

--- Comment #1 from Robin Kauffman <robink@creosotehill.org> ---
Oops, s/kennel/kernel/

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[Bug 104736] Kernel panic with agd5's drm-next-4.17-wip & GFX8/Polaris10/Ellesmere/Rx-480-8GiB

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https://bugs.freedesktop.org/show_bug.cgi?id=104736

--- Comment #2 from Alex Deucher <alexdeucher@gmail.com> ---
does manually loading gpu_sched before amdgpu fix the issue?

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[Bug 104736] Kernel panic with agd5's drm-next-4.17-wip & GFX8/Polaris10/Ellesmere/Rx-480-8GiB

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https://bugs.freedesktop.org/show_bug.cgi?id=104736

--- Comment #3 from Robin Kauffman <robink@creosotehill.org> ---
(In reply to Alex Deucher from comment #2)
> does manually loading gpu_sched before amdgpu fix the issue?

Can try to do so, but unsure as to how given that pretty much the entire
graphics stack is compiled into the kernel image.
Reverting commit 4983e48c8539282be15f660bdd2c4260467b1190 ('drm/sched: move
fence slab handling to module init/exit') fixes the issue, and thus this bug
may be a duplicate of bug #104756.  If so, this bug can be closed as a
duplicate, or I can experiment with trying to force gpu_sched up first.

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[Bug 104736] Kernel panic with agd5's drm-next-4.17-wip & GFX8/Polaris10/Ellesmere/Rx-480-8GiB

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https://bugs.freedesktop.org/show_bug.cgi?id=104736

--- Comment #4 from Michel Dänzer <michel@daenzer.net> ---
Please attach the CONFIG_DRM entries of the kernel build configuration file.

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[Bug 104736] Kernel panic with agd5's drm-next-4.17-wip & GFX8/Polaris10/Ellesmere/Rx-480-8GiB

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https://bugs.freedesktop.org/show_bug.cgi?id=104736

Christian König <ckoenig.leichtzumerken@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mike@fireburn.co.uk

--- Comment #5 from Christian König <ckoenig.leichtzumerken@gmail.com> ---
*** Bug 104756 has been marked as a duplicate of this bug. ***

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[Bug 104736] Kernel panic with agd5's drm-next-4.17-wip & GFX8/Polaris10/Ellesmere/Rx-480-8GiB

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--- Comment #6 from Christian König <ckoenig.leichtzumerken@gmail.com> ---
Created attachment 136937
  --> https://bugs.freedesktop.org/attachment.cgi?id=136937&action=edit
Possible fix

I was able to reproduce the problem and the attached patch should fix it.

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[Bug 104736] Kernel panic with agd5's drm-next-4.17-wip & GFX8/Polaris10/Ellesmere/Rx-480-8GiB

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--- Comment #7 from Mike Lothian <mike@fireburn.co.uk> ---
I can confirm is does fix the issues I was seeing

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[Bug 104736] Kernel panic with agd5's drm-next-4.17-wip & GFX8/Polaris10/Ellesmere/Rx-480-8GiB

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Christian König <ckoenig.leichtzumerken@gmail.com> changed:

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

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[Bug 104736] Kernel panic with agd5's drm-next-4.17-wip & GFX8/Polaris10/Ellesmere/Rx-480-8GiB

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Christian König <ckoenig.leichtzumerken@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |CLOSED

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