[PATCH] Revert "drm/radeon: handle PCIe root ports with addressing limitations"

[Christoph Hellwig]

On Tue, Sep 15, 2020 at 02:46:07PM -0400, Alex Deucher wrote:
> This change breaks tons of systems.

Did you do at least some basic root causing on why?  Do GPUs get
fed address they can't deal with?  Any examples?

Bug 1 doesn't seem to contain any analysis and was reported against
a very old kernel that had all kind of fixes since.

Bug 2 seems to imply a drm kthread is accessing some structure it
shouldn't, which would imply a mismatch between pools used by radeon
now and those actually provided by the core.  Something that should
be pretty to trivial to fix for someone understanding the whole ttm
pool maze.

Bug 3: same as 1, but an even older kernel.

Bug 4: looks like 1 and 3, and actually verified to work properly
in 5.9-rc.  Did you try to get the other reporters test this as well?

All over not a very useful changelog.