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

[bugzilla-daemon at freedesktop.org]

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 at lists.freedesktop.org
          Reporter: bas at 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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