Date: Tue, 28 Jun 2022 15:38:48 -0500 From: Jake Freeland <jake@technologyfriends.net> To: freebsd-hackers@freebsd.org, Mark Johnston <markj@freebsd.org> Subject: LinuxKPI debugfs Port Message-ID: <CAOgZAGaQOhxS0oeM-797fHy3Zs1D4A=hnS3uVYqKnzw4HWn8CA@mail.gmail.com>
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[-- Attachment #1 --] Hi there, I am working on porting Intel's igt-gpu-tools drm graphics driver testing suite to FreeBSD and I ran into some issues regarding debugfs. I spoke to manu@ who told me that CONFIG_DEBUG_FS is required for the testing to work properly. I started working on a debugfs port and quickly got confused about what manu@ meant by implementing "CONFIG_DEBUG_FS". Some quick internet searching says that CONFIG_DEBUG_FS is a Linux kernel configuration flag. I am curious how I would go about implementing this into FreeBSD. I copied the Linux debugfs source code into a new repository and attempted to compile it on FreeBSD as a kernel module: https://github.com/jakesfreeland/debugfs-freebsd Of course I was met with many, many incompatibility errors. I proceeded to copy the required `sys/compat/linuxkpi/common/include/linux` headers into my repository and I was met with two options: 1. continue modifying the LinuxKPI headers and commit my modifications to src. 2. re-engineer the debugfs source code to comply with the preexisting LinuxKPI headers. Many problems come with both approaches. First, if I modify the LinuxKPI headers, I'd be "copying" over some code from Linux's GPLv2 headers. I do not know how much I can "copy" before legal issues arise. Second, if I re-engineer the debugfs source code, I am revolting against what LinuxKPI stands for: running Linux code with little-to-no modification. I don't know what the correct approach is here. I also discovered that lindebugfs, a curtailed version of Linux's debugfs, already exists in FreeBSD's src. I am led to believe that this is exclusively used under the Linuxulator so it wouldn't help me. Is this correct? Thank you so much, Jake Freeland [-- Attachment #2 --] <div dir="ltr">Hi there,<br><div><br></div><div>I am working on porting Intel's igt-gpu-tools drm graphics driver testing</div><div>suite to FreeBSD and I ran into some issues regarding debugfs. I spoke</div><div>to manu@ who told me that CONFIG_DEBUG_FS is required for the</div><div>testing to work properly. I started working on a debugfs port and quickly</div><div>got confused about what manu@ meant by implementing "CONFIG_DEBUG_FS".</div><div><br></div><div>Some quick internet searching says that CONFIG_DEBUG_FS is a</div><div>Linux kernel configuration flag. I am curious how I would go about</div><div>implementing this into FreeBSD. I copied the Linux debugfs source</div><div>code into a new repository and attempted to compile it on FreeBSD</div><div>as a kernel module:</div><div><br></div><div><a href="https://github.com/jakesfreeland/debugfs-freebsd">https://github.com/jakesfreeland/debugfs-freebsd</a><br></div><div><br></div><div>Of course I was met with many, many incompatibility errors. I proceeded</div><div>to copy the required `sys/compat/linuxkpi/common/include/linux` headers</div><div>into my repository and I was met with two options:</div><div><br></div><div>1. continue modifying the LinuxKPI headers and commit my modifications</div><div>to src.</div><div><br></div><div>2. re-engineer the debugfs source code to comply with the preexisting</div><div>LinuxKPI headers.</div><div><br></div><div>Many problems come with both approaches. First, if I modify the LinuxKPI</div><div>headers, I'd be "copying" over some code from Linux's GPLv2 headers.</div><div>I do not know how much I can "copy" before legal issues arise. Second,</div><div>if I re-engineer the debugfs source code, I am revolting against what LinuxKPI</div><div>stands for: running Linux code with little-to-no modification. I don't know</div><div>what the correct approach is here.</div><div><br></div><div>I also discovered that lindebugfs, a curtailed version of Linux's debugfs,</div><div>already exists in FreeBSD's src. I am led to believe that this is exclusively</div><div>used under the Linuxulator so it wouldn't help me. Is this correct?</div><div><br></div><div>Thank you so much,</div><div>Jake Freeland</div></div>help
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