Date: Wed, 20 Jul 2016 20:33:24 +0530 From: Akshay Jaggi <akshay1994.leo@gmail.com> To: soc-status@freebsd.org, soc-admins@freebsd.org Cc: Pedro Giffuni <pfg@freebsd.org>, =?UTF-8?Q?Roger_Pau_Monn=C3=A9?= <royger@freebsd.org> Subject: Grant Table Userspace Device - Status Update Message-ID: <CAAeUNVnfK29Mck_eRKguij2pYV%2BehAG=Qb5bcYwRJZXmODbPQQ@mail.gmail.com>
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Hello Everyone, I hope everyone is doing great. First things first. I want to apologise for not updating my blogpost after June 15. Some personal stuff happened on June 17, and since then all my work routines are completely disturbed. Soc-admins know about this, and I hope the community can pardon my irregularity this once. Now, time for some status update on the project. We have a working Grant Table User-space Device (with some caveats, of course). Yay!! Check out the code on the pull request: https://github.com/freebsd/freebsd/compare/master...akshay1994:grant_table?expand=1 Test the device by compiling a custom kernel; from my working branch: https://github.com/akshay1994/freebsd/tree/grant_table Caveats and work yet to be done: - A kernel panic happens if you terminate the program without un-mmapping all the mmaps. - The interface for a grant map is not completely in sync with the Linux interface yet. Notably, we still map and subsequently mmap partially working grants. This is a bug since the pager will fail on a page fault for the non-working-grant. - I'm yet to add event channel code for the notify ioctls. - I'm yet to get in touch with the vm-guys. I spent a lot of time understanding the vm structure, but I surely do not have a complete picture. I'm using a MGTDEVICE cdev pager to handle managed, fictitious pages from mapped grants, and a custom PHYS vm object to manage wired physical memory for allocated grants. I have to - Confirm if the approach I am using is the best one. - The interface differs compared to Linux with regards to multiple mmaps, which I need a little help with. Looking forward to some community testing of the working parts. Comments are welcome and highly appreciated. :) Regards, Akshay Jaggi
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