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...USH_MAX_LENGTH, when my analysis logging > shows that they regularly exceed this maximum by an order of magnitude > or more. Was the assumption originally true? If so, when/why did it > change? Is the more correct fix to enforce individual pushbuf size > limits? The BO itself can be artibrarily sized. However the length stored in the ring only has so many bits, so that provides a natural maximum. https://envytools.readthedocs.io/en/latest/hw/fifo/dma-pusher.html#ib-mode This might be different on newer gens though. Cheers, -ilia

I didn't file an Issue as I understand the cause and have a successful patch that I've been running here for several days. gitlab.freedesktop.org is RO (ie, I can't fork/stage a PR there) so I committed the absurdity of creating a PR on the public gitlab mirror in order to have a URL to point to: https://gitlab.com/freedesktop-mirror/drm/-/merge_requests/1 copypasting the commit