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From:   Oded Gabbay <ogabbay@kernel.org>
Date:   Thu, 28 Sep 2023 08:28:51 +0300
Message-ID: <CAFCwf13ZiYYoXE+S_wQ_EhjiACPGJGT+70_stwpY_=aD=VYa4A@mail.gmail.com>
Subject: Re: kernel.org 6.5.4 , NPU driver, --not support (RFC)
To:     Cancan Chang <Cancan.Chang@amlogic.com>
Cc:     Jagan Teki <jagan@edgeble.ai>,
        linux-media <linux-media@vger.kernel.org>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        Dave Airlie <airlied@redhat.com>,
        Daniel Vetter <daniel.vetter@ffwll.ch>
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On Wed, Sep 27, 2023 at 10:01=E2=80=AFAM Cancan Chang <Cancan.Chang@amlogic=
.com> wrote:
>
> =E2=80=9COr do you handle one cmd at a time, where the user sends a cmd b=
uffer
> to the driver and the driver then submit it by writing to a couple of
> registers and polls on some status register until its done, or waits
> for an interrupt to mark it as done ?=E2=80=9D
>   --- yes=EF=BC=8C user sends a cmd buffer to driver, and driver triggers=
 hardware by writing to register,
>         and then, waits for an interrupt to mark it  as done.
>
>     My current driver is very different from drm, so I want to know if I =
have to switch to drm=EF=BC=9F
Could you please post a link to the driver's source code ?
In addition, could you please elaborate which userspace libraries
exists that work with your driver ? Are any of them open-source ?

>     Maybe I can refer to /driver/accel/habanalabs.
That's definitely a possibility.

Oded
>
> thanks
>
> ________________________________________
> =E5=8F=91=E4=BB=B6=E4=BA=BA: Oded Gabbay <ogabbay@kernel.org>
> =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2023=E5=B9=B49=E6=9C=8826=E6=97=A5 =
20:54
> =E6=94=B6=E4=BB=B6=E4=BA=BA: Cancan Chang
> =E6=8A=84=E9=80=81: Jagan Teki; linux-media; linux-kernel; Dave Airlie; D=
aniel Vetter
> =E4=B8=BB=E9=A2=98: Re: kernel.org 6.5.4 , NPU driver, --not support (RFC=
)
>
> [ EXTERNAL EMAIL ]
>
> On Mon, Sep 25, 2023 at 12:29=E2=80=AFPM Cancan Chang <Cancan.Chang@amlog=
ic.com> wrote:
> >
> > 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 forma=
t cmd buffer,
> > and submit this cmd buffer to ADLA hardware. It is not programmable dev=
ice.
> What exactly does it mean to "submit this cmd buffer to ADLA hardware" ?
>
> Does your h/w provides queues for the user/driver to put their
> workloads/cmd-bufs on them ? And does it provide some completion queue
> to notify when the work is completed?
>
> Or do you handle one cmd at a time, where the user sends a cmd buffer
> to the driver and the driver then submit it by writing to a couple of
> registers and polls on some status register until its done, or waits
> for an interrupt to mark it as done ?
>
> >
> > 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 regist=
ration is through the platform_driver,
> > is it necessary to switch to drm?
> This probably depends on the answer to my question above. btw, there
> are drivers in drm that handle IPs that are part of an SOC, so
> platform_driver is supported.
>
> Oded
>
> >
> > thanks.
> >
> > ________________________________________
> > =E5=8F=91=E4=BB=B6=E4=BA=BA: Oded Gabbay <ogabbay@kernel.org>
> > =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2023=E5=B9=B49=E6=9C=8822=E6=97=
=A5 23:08
> > =E6=94=B6=E4=BB=B6=E4=BA=BA: Jagan Teki
> > =E6=8A=84=E9=80=81: Cancan Chang; linux-media; linux-kernel; Dave Airli=
e; Daniel Vetter
> > =E4=B8=BB=E9=A2=98: Re: kernel.org 6.5.4 , NPU driver, --not support (R=
FC)
> >
> > [=E4=BD=A0=E9=80=9A=E5=B8=B8=E4=B8=8D=E4=BC=9A=E6=94=B6=E5=88=B0=E6=9D=
=A5=E8=87=AA ogabbay@kernel.org =E7=9A=84=E7=94=B5=E5=AD=90=E9=82=AE=E4=BB=
=B6=E3=80=82=E8=AF=B7=E8=AE=BF=E9=97=AE https://aka.ms/LearnAboutSenderIden=
tification=EF=BC=8C=E4=BB=A5=E4=BA=86=E8=A7=A3=E8=BF=99=E4=B8=80=E7=82=B9=
=E4=B8=BA=E4=BB=80=E4=B9=88=E5=BE=88=E9=87=8D=E8=A6=81]
> >
> > [ EXTERNAL EMAIL ]
> >
> > On Fri, Sep 22, 2023 at 12:38=E2=80=AFPM Jagan Teki <jagan@edgeble.ai> =
wrote:
> > >
> > > On Fri, 22 Sept 2023 at 15:04, Cancan Chang <Cancan.Chang@amlogic.com=
> wrote:
> > > >
> > > > Dear Media Maintainers:
> > > >      Thanks for your attention. Before describing my problem=EF=BC=
=8Clet me introduce to you what I  mean by NPU.
> > > >      NPU is Neural Processing Unit, It is designed for deep learnin=
g acceleration, It is also called TPU, APU ..
> > > >
> > > >      The real problems:
> > > >       When I was about to upstream my NPU driver codes to linux mai=
nline, i meet two problems:
> > > >         1.  According to my research, There is no NPU module path i=
n 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 pat=
h prepared for NPU driver currently?
> > > >         2.   If there is no NPU driver path currently, I am going t=
o put my NPU driver code in the drivers/media/platform/amlogic/ =EF=BB=BF, =
because my NPU driver belongs to amlogic. and amlogic NPU is mainly used fo=
r 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