Date: Thu, 18 Jan 2024 16:22:27 +0200
From: Oded Gabbay <ogabbay@...nel.org>
To: Tomeu Vizoso <tomeu@...euvizoso.net>
Cc: Cancan Chang <Cancan.Chang@...ogic.com>, Jagan Teki <jagan@...eble.ai>,
 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: Re: kernel.org 6.5.4 , NPU driver, --not support (RFC)

On 15/01/2024 10:29, Tomeu Vizoso wrote:
> On Thu, Jan 11, 2024 at 2:14 PM Oded Gabbay <ogabbay@...nel.org> wrote:
>>
>> On 11/01/2024 10:04, Tomeu Vizoso wrote:
>>> Hi Oded,
>>>
>>> Out of curiosity, did you end up taking a look at Amlogic's driver?
>>>
>>> Cheers,
>>>
>>> Tomeu
>> Hi Tomeu,
>> Yes, I have looked at the driver's code. It was not an in-depth review,
>> but I tried to mainly understand the features the driver provide to the
>> user and how much complex it is.
>>
>>   From what I could see, this is a full-fledged accelerator which
>> requires command submission/completion handling, memory management,
>> information and debug capabilities and more.
>>
>> Therefore, I do think the correct place is in the accel sub-system,
>> which will require you to convert the driver to use drm (we can discuss
>> exactly what is the level of integration required).
>>
>> As I said, I didn't do a full-fledged review, but please note the driver
>> has a lot of OS-wrapper code, which is not acceptable in the Linux
>> kernel, so you will have to clean all the up.
> 
> Thanks, Oded.
> 
> I'm wondering now about the requirement for open userspace. Do we have
> it for this one?
> 
> Cheers,
> 
> Tomeu
The requirements are the same as for the other drivers in accel, which 
is to have at least the Runtime/UMD part open-sourced.
If this accelerator also runs compiled code (e.g. kernels/shaders), you 
will also need to open source the compiler.

Oded

> 
>> Thanks,
>> Oded
>>
>>>
>>> On Sat, Oct 7, 2023 at 8:37 AM Cancan Chang <Cancan.Chang@...ogic.com> wrote:
>>>>
>>>> Oded,
>>>>          You can get the driver code from  github link： https://github.com/OldDaddy9/driver
>>>>           e.g.  git clone https://github.com/OldDaddy9/driver.git
>>>>
>>>> ________________________________________
>>>> 发件人: Oded Gabbay <ogabbay@...nel.org>
>>>> 发送时间: 2023年10月3日 18:52
>>>> 收件人: Cancan Chang
>>>> 抄送: Jagan Teki; linux-media; linux-kernel; Dave Airlie; Daniel Vetter
>>>> 主题: Re: kernel.org 6.5.4 , NPU driver, --not support (RFC)
>>>>
>>>> [ EXTERNAL EMAIL ]
>>>>
>>>> On Thu, Sep 28, 2023 at 11:16 AM Cancan Chang <Cancan.Chang@...ogic.com> wrote:
>>>>>
>>>>> “What happens if you call this again without waiting for the previous
>>>>> inference to complete ?”
>>>>>      --- There is a work-queue in the driver to manage inference tasks.
>>>>>            When two consecutive inference tasks occur, the second inference task will be add to
>>>>>            the "pending list". While the previous inference task ends, the second inference task will
>>>>>            switch to the "scheduled list", and be executed.
>>>>>            Each inference task has an id,  "inferece" and "wait until finish" are paired.
>>>>>
>>>>>            thanks
>>>> Thanks for the clarification.
>>>> I'll wait for your driver's code link. It doesn't have to be a patch
>>>> series at this point. A link to a git repo is enough.
>>>> I just want to do a quick pass.
>>>>
>>>> Thanks,
>>>> Oded
>>>>
>>>>
>>>>
>>>>>
>>>>> ________________________________________
>>>>> 发件人: Oded Gabbay <ogabbay@...nel.org>
>>>>> 发送时间: 2023年9月28日 15:40
>>>>> 收件人: Cancan Chang
>>>>> 抄送: Jagan Teki; linux-media; linux-kernel; Dave Airlie; Daniel Vetter
>>>>> 主题: Re: kernel.org 6.5.4 , NPU driver, --not support (RFC)
>>>>>
>>>>> [ EXTERNAL EMAIL ]
>>>>>
>>>>> On Thu, Sep 28, 2023 at 10:25 AM Cancan Chang <Cancan.Chang@...ogic.com> wrote:
>>>>>>
>>>>>> “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 ?”
>>>>>> --- We will prepare the adla driver link after the holiday on October 6th.
>>>>>>        It's a pity that there is no open-source userspace library.
>>>>>>        But you can probably understand it through a workflow, which can be simplified as:
>>>>>>        1. create model context
>>>>>>             ret = ioctl(context->fd, ADLAK_IOCTL_REGISTER_NETWORK, &desc);
>>>>>>        2.  set inputs
>>>>>>        3.  inference
>>>>>>              ret = ioctl(context->fd, ADLAK_IOCTL_INVOKE, &invoke_dec);
>>>>> What happens if you call this again without waiting for the previous
>>>>> inference to complete ?
>>>>> Oded
>>>>>>        4.  wait for the inference to complete
>>>>>>              ret = ioctl(context->fd, ADLAK_IOCTL_WAIT_UNTIL_FINISH, &stat_req_desc);
>>>>>>        5.  destroy model context
>>>>>>              ret = ioctl(context->fd, ADLAK_IOCTL_DESTROY_NETWORK, &submit_del);
>>>>>>
>>>>>>
>>>>>>         thanks
>>>>>>
>>>>>>
>>>>>> ________________________________________
>>>>>> 发件人: Oded Gabbay <ogabbay@...nel.org>
>>>>>> 发送时间: 2023年9月28日 13:28
>>>>>> 收件人: Cancan Chang
>>>>>> 抄送: Jagan Teki; linux-media; linux-kernel; Dave Airlie; Daniel Vetter
>>>>>> 主题: Re: kernel.org 6.5.4 , NPU driver, --not support (RFC)
>>>>>>
>>>>>> [ EXTERNAL EMAIL ]
>>>>>>
>>>>>> On Wed, Sep 27, 2023 at 10:01 AM Cancan Chang <Cancan.Chang@...ogic.com> wrote:
>>>>>>>
>>>>>>> “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 ?”
>>>>>>>     --- yes， 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？
>>>>>> 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
>>>>>>>
>>>>>>> ________________________________________
>>>>>>> 发件人: Oded Gabbay <ogabbay@...nel.org>
>>>>>>> 发送时间: 2023年9月26日 20:54
>>>>>>> 收件人: Cancan Chang
>>>>>>> 抄送: Jagan Teki; linux-media; linux-kernel; Dave Airlie; Daniel Vetter
>>>>>>> 主题: Re: kernel.org 6.5.4 , NPU driver, --not support (RFC)
>>>>>>>
>>>>>>> [ EXTERNAL EMAIL ]
>>>>>>>
>>>>>>> On Mon, Sep 25, 2023 at 12:29 PM Cancan Chang <Cancan.Chang@...ogic.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 format cmd buffer,
>>>>>>>> and submit this cmd buffer to ADLA hardware. It is not programmable device.
>>>>>>> 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 registration 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.
>>>>>>>>
>>>>>>>> ________________________________________
>>>>>>>> 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)
>>>>>>>>
>>>>>>>> [你通常不会收到来自 ogabbay@...nel.org 的电子邮件。请访问 https://aka.ms/LearnAboutSenderIdentification，以了解这一点为什么很重要]
>>>>>>>>
>>>>>>>> [ EXTERNAL EMAIL ]
>>>>>>>>
>>>>>>>> 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
>>
>>

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