[Bug 206987] [drm] [amdgpu] Whole system crashes when the driver is in mode_support_and_system_configuration

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=206987

Jan Kokemüller (jan.kokemueller at gmail.com) changed:

           What    |Removed                     |Added
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                 CC|                            |jan.kokemueller at gmail.com

--- Comment #39 from Jan Kokemüller (jan.kokemueller at gmail.com) ---
Created attachment 295225
  --> https://bugzilla.kernel.org/attachment.cgi?id=295225&action=edit
Call DC_FP_START() / DC_FP_END() in dcn21_validate_bandwidth

Could it be that DC_FP_START()/DC_FP_END() aka
kernel_fpu_begin()/kernel_fpu_end() are not called in the *_validate_bandwidth
code path on AMD Renoir systems? To my untrained eye it looks like it is
missing, while it _is_ there for dcn20.

I've been running the attached patch for 2 days now with some KVM VMs open and
the system seems stable. Previously, I had similar crashes/backtraces @krakopo
described.

I'm happy to help testing any patches. I'm running a Thinkpad T14 with a AMD
Ryzen 7 PRO 4750U (Renoir).

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