Dave Airlie
06e8db646a
nvidia hardware can't render to linear surfaces except under some very limited circumstances, one of those is if Z is enabled. However there appears to be some combination of gnome-shell, and prime (with 2 nouveau cards) where we end up getting through the GL API to the situation where we try this. This in a production build causes the kernel to crash with a GR error. However there existed a period of time where the hw/kernel due to some other random hw misconfiguration didn't crash when this happened and doing this was prefect fine. (linear + tiled Z). This restores the userspace code to do this and just ignores the Z buffers if we are asked for linear rendering, and seems sufficient to fix the problem. I do understand this is a workaround, but I think it's reasonable to add to the nouveau GL driver at this time since we don't want to maintain if for ever and it probably should fix a bunch of wierd user problems with multi gpu and nouveau. Cc: mesa-stable Reviewed-by: Karol Herbst <kherbst@redhat.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35221>
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