igt-gpu-tools Status Report

Hi there,

I am working on porting Intel's igt-gpu-tools drm graphics driver
testing suite over to FreeBSD. A lot of progress and clarification
occurred this week.

First, I spoke with my mentors, jrm@ and manu@, who clarified
that CONFIG_DEBUG_FS is a kconfig flag that toggles the use
of debugfs when compiling drm-kmod. Lindebugfs, FreeBSD's
implementation of debugfs needs some work to compile
correctly with drm-kmod.

Since debugfs and drm-kmod are essential components of
igt-gpu-tools, I started fixing compilation errors for drm-kmod
with CONFIG_DEBUG_FS enabled and ended up creating
function specifications for required GPLv2 code. These
specifications will help later on when clean-room implementing
these functions under the BSD 2 clause license.

I also completed a BSD licensed simple_read_from_buffer()
function that copies kernel-space data into to a user-space buffer.
The Linux code already provided a function specification so
I completed the function by looking directly at that and avoiding
the GPL licensed code.

I completed debugfs compilation for amdgpu today and have
started analyzing Intel's i915 driver files. Hopefully I am able to have
drm-kmod compiling with dummy functions very soon.

Thank you,
Jake Freeland