linux-kernel - 回复: kernel.org 6.5.4 , NPU driver, --not support (RFC)

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Message-ID: <SEYPR03MB70462A385A52A317427E93B59AFCA@SEYPR03MB7046.apcprd03.prod.outlook.com>
Date:   Mon, 25 Sep 2023 09:29:29 +0000
From:   Cancan Chang <Cancan.Chang@...ogic.com>
To:     Oded Gabbay <ogabbay@...nel.org>, Jagan Teki <jagan@...eble.ai>
CC:     linux-media <linux-media@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Dave Airlie <airlied@...hat.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>
Subject: 回复: kernel.org 6.5.4 , NPU driver, --not support (RFC)

Thank you for your reply from Jagan & Oded.

It is very appropritate for my driver to be placed in driver/accel.

My accelerator is named ADLA(Amlogic Deep Learning Accelerator).
It is an IP in SOC,mainly used for neural network models acceleration.
It will split and compile the neural network model into a private format cmd buffer,
and submit this cmd buffer to ADLA hardware. It is not programmable device.

ADLA includes four hardware engines:
RS engines             : working for the reshape operators
MAC engines         : working for the convolution operators
DW engines           : working for the planer & Elementwise operators
Activation engines : working for activation operators(ReLu,tanh..)

By the way, my IP is mainly used for SOC, and the current driver registration is through the platform_driver,
is it necessary to switch to drm?

thanks.

________________________________________
发件人: Oded Gabbay <ogabbay@...nel.org>
发送时间: 2023年9月22日 23:08
收件人: Jagan Teki
抄送: Cancan Chang; linux-media; linux-kernel; Dave Airlie; Daniel Vetter
主题: Re: kernel.org 6.5.4 , NPU driver, --not support (RFC)

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On Fri, Sep 22, 2023 at 12:38 PM Jagan Teki <jagan@...eble.ai> wrote:
>
> On Fri, 22 Sept 2023 at 15:04, Cancan Chang <Cancan.Chang@...ogic.com> wrote:
> >
> > Dear Media Maintainers:
> >      Thanks for your attention. Before describing my problem，let me introduce to you what I  mean by NPU.
> >      NPU is Neural Processing Unit, It is designed for deep learning acceleration, It is also called TPU, APU ..
> >
> >      The real problems:
> >       When I was about to upstream my NPU driver codes to linux mainline, i meet two problems:
> >         1.  According to my research, There is no NPU module path in the linux (base on linux 6.5.4) , I have searched all linux projects and found no organization or comany that has submitted NPU code. Is there a path prepared for NPU driver currently?
> >         2.   If there is no NPU driver path currently, I am going to put my NPU driver code in the drivers/media/platform/amlogic/ , because my NPU driver belongs to amlogic. and amlogic NPU is mainly used for AI vision applications. Is this plan suitabe for you?
>
> If I'm correct about the discussion with Oded Gabby before. I think
> the drivers/accel/ is proper for AI Accelerators including NPU.
>
> + Oded in case he can comment.
>
> Thanks,
> Jagan.
Thanks Jagan for adding me to this thread. Adding Dave & Daniel as well.

Indeed, the drivers/accel is the place for Accelerators, mainly for
AI/Deep-Learning accelerators.
We currently have 3 drivers there already.

The accel subsystem is part of the larger drm subsystem. Basically, to
get into accel, you need to integrate your driver with the drm at the
basic level (registering a device, hooking up with the proper
callbacks). ofc the more you use code from drm, the better.
You can take a look at the drivers under accel for some examples on
how to do that.

Could you please describe in a couple of sentences what your
accelerator does, which engines it contains, how you program it. i.e.
Is it a fixed-function device where you write to a couple of registers
to execute workloads, or is it a fully programmable device where you
load compiled code into it (GPU style) ?

For better background on the accel subsystem, please read the following:
https://docs.kernel.org/accel/introduction.html
This introduction also contains links to other important email threads
and to Dave Airlie's BOF summary in LPC2022.

Thanks,
Oded