On Wed, Aug 10, 2022 at 5:10 PM <yuji2.ishikawa@xxxxxxxxxxxxx> wrote: > > > -----Original Message----- > > From: Oded Gabbay <oded.gabbay@xxxxxxxxx> > > Sent: Wednesday, August 10, 2022 6:42 AM > > To: Dave Airlie <airlied@xxxxxxxxx>; Greg Kroah-Hartman > > <gregkh@xxxxxxxxxxxxxxxxxxx>; ishikawa yuji(石川 悠司 ○ＲＤＣ□ＡＩＴＣ○ > > ＥＡ開) <yuji2.ishikawa@xxxxxxxxxxxxx>; Jiho Chu <jiho.chu@xxxxxxxxxxx> > > Cc: dri-devel <dri-devel@xxxxxxxxxxxxxxxxxxxxx>; Arnd Bergmann > > <arnd@xxxxxxxx>; Linux-Kernel@Vger. Kernel. Org > > <linux-kernel@xxxxxxxxxxxxxxx>; Jason Gunthorpe <jgg@xxxxxxxxxx> > > Subject: Re: New subsystem for acceleration devices > > > > Hi Jiho, Yuji. > > > > I want to update that I'm currently in discussions with Dave to figure out what's > > the best way to move forward. We are writing it down to do a proper comparison > > between the two paths (new accel subsystem or using drm). I guess it will take > > a week or so. > > > > In the meantime, I'm putting the accel code on hold. I have only managed to do > > the very basic infra and add a demo driver that shows how to register and > > unregister from it. > > You can check the code at: > > https://git.kernel.org/pub/scm/linux/kernel/git/ogabbay/linux.git/log/?h=ac > > cel > > > > It has two commits. The first adds the subsystem code and the second adds the > > demo driver. > > The subsystem code is basically drm code copied and renamed and slightly > > modified, but I really only worked on it for a couple of hours so take that into > > consideration. > > > > The important thing is that the demo driver shows the basic steps are really > > simple. You need to add two function calls in your probe and one function call in > > your release. Of course you will need to supply some function callbacks, but I > > haven't got to fill that in the demo driver. Once you register, you get > > /dev/accel/ac0 and > > /dev/accel/ac_controlD64 (if you want a control device). If I were to continue > > this, the next step is to do the open and close part. > > > > I will update once we know where things are heading. As I said, I imagine it can > > take a few weeks. > > > > Thanks, > > Oded > > Hi Odded, > Thank you for uploading the framework as well as a sample. > It's exciting to see new software is growing up. > > Since Visconti DNN is a platform device, I'll write some test code to initialize driver and see if it works. > > Regards, > Yuji Platform or PCI, it doesn't matter. You just call it from the probe. But really, this is something I did in a few hours and I stopped because there were some objections and I wanted to first talk about it with Dave. I don't know if it's worth it for you to waste time on it at this point. Thanks, Oded
