[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

--- Comment #40 from Alex Deucher (alexdeucher at gmail.com) ---
(In reply to Jan Kokemüller from comment #39)
> Created attachment 295225 [details]
> 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).

Looks correct.  Care to send out a proper git patch?

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