[Bug 204609] amdgpu: powerplay failed send message

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=204609

Błażej Szczygieł (spaz16 at wp.pl) changed:

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                 CC|                            |spaz16 at wp.pl

--- Comment #5 from Błażej Szczygieł (spaz16 at wp.pl) ---
Created attachment 286329
  --> https://bugzilla.kernel.org/attachment.cgi?id=286329&action=edit
kernel5.4 powerplay add mutex

Also the same as: https://gitlab.freedesktop.org/drm/amd/issues/900

In kernel 5.4.3 run a few times `watch -n 0.1 cat
/sys/class/drm/card0/device/hwmon/hwmon*/fan1_input` in parallel and you'll
have a lot of warning and finally system freeze.

In kernel 5.5-rc2 powerplay warnings and finally system freeze can happen when
sensors are read and screen mode is changed (like screen resolution change,
etc).

In my opinion a lot of powerplay issues are caused by missing mutexes between
kernel and user space. I prepared a very simple kernel 5.4 patch which allows
me to use fan monitor, but probably there are still some missing mutexes there.

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