[Bug 106872] vram sizes reported by the kernel totally off

[Bug 106872] vram sizes reported by the kernel totally off

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=106872

            Bug ID: 106872
           Summary: vram sizes reported by the kernel totally off
           Product: DRI
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: bas@basnieuwenhuizen.nl

With Pierre-Loup's desktop we have an issue where the reported VRAM and CPU
visible VRAM are totally off.

e.g. the last report we had kernel reported total VRAM size of
0xfffffffb3070f000 (16.0 EiB) and a visible VRAM size of 0x86135000 (2.09 GiB).

The system is a large aperture system, so expected is ~8 GiB for both, and it
is most of the time. The system typically boots in a good state and eventually
after a while transitions to a bad state and sometimes it transitions back.

We have not been able to find a pattern and on one of the earlier cases the
debugfs vram_mm file reported reasonable size & utilization.


The kernels that have been tried include amd-staging-drm-next and a released
kernel (need to look up whether it was 4.15 or 4.16 if that information is
needed)

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[Bug 106872] vram sizes reported by the kernel totally off

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https://bugs.freedesktop.org/show_bug.cgi?id=106872

--- Comment #1 from Michel Dänzer <michel@daenzer.net> ---
Please attach the dmesg output from the affected system, preferably captured
while or after the problem occurs.

(In reply to Bas Nieuwenhuizen from comment #0)
> e.g. the last report we had kernel reported total VRAM size of
> 0xfffffffb3070f000 (16.0 EiB) and a visible VRAM size of 0x86135000 (2.09
> GiB).

Not the other way around?

One potential issue I can see is that only BOs with
AMDGPU_GEM_CREATE_NO_CPU_ACCESS are accounted for invisible_pin_size. But such
BOs can still end up pinned at least partially in CPU visible VRAM, which would
mess up the calculation of how much visible VRAM currently isn't pinned.

One possible solution for this would be for amdgpu_bo_pin_restricted and
amdgpu_bo_unpin to walk the list of memory nodes and calculate exactly how much
of each of them lies in visible or invisible VRAM.

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[Bug 106872] vram sizes reported by the kernel totally off

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=106872

--- Comment #2 from Christian König <ckoenig.leichtzumerken@gmail.com> ---
(In reply to Michel Dänzer from comment #1)
> One possible solution for this would be for amdgpu_bo_pin_restricted and
> amdgpu_bo_unpin to walk the list of memory nodes and calculate exactly how
> much of each of them lies in visible or invisible VRAM.

We actually have a helper for that in amdgpu_vram_mgr_vis_size().

Apart from that if the problem only occurse after a certain time it looks like
we have a mismatch between adding the pinned size and subtracting it again. Or
alternatively some sort of memory corruption.

Have you tried running it with KASAN enabled for a while?

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[Bug 106872] vram sizes reported by the kernel totally off

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https://bugs.freedesktop.org/show_bug.cgi?id=106872

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|dri-devel@lists.freedesktop |michel@daenzer.net
                   |.org                        |

--- Comment #3 from Michel Dänzer <michel@daenzer.net> ---
Created attachment 140160
  --> https://bugs.freedesktop.org/attachment.cgi?id=140160&action=edit
drm/amdgpu: Refactor amdgpu_vram_mgr_bo_sizes helper

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