AMDGPU It was significantly larger than the entire OpenBSD kernel sources. The dev/pci/drm directory ballooned to around ~130M. As of 6.8/-current, it's now 191M. It was under ~20M before May of 2019, prior to it first being committed.

This driver is I believe part of the common codebase that AMD upstreamed to the Linux kernel, it's shared with its proprietary driver on other platforms.