linux-kernel - Re: [RFC PATCH 0/4] Add a RPMsg driver to support AI Processing Unit (APU)

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Message-ID: <8e4bb739-c3b3-d790-e8e3-dd5df2d6f869@baylibre.com>
Date:   Thu, 1 Oct 2020 19:28:27 +0200
From:   Alexandre Bailon <abailon@...libre.com>
To:     linux-remoteproc@...r.kernel.org, ohad@...ery.com,
        gpain@...libre.com, stephane.leprovost@...iatek.com,
        jstephan@...libre.com, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org,
        mturquette@...libre.com, bjorn.andersson@...aro.org,
        christian.koenig@....com, linux-media@...r.kernel.org
Subject: Re: [RFC PATCH 0/4] Add a RPMsg driver to support AI Processing Unit
 (APU)

Hi Daniel,

On 10/1/20 10:48 AM, Daniel Vetter wrote:
> On Wed, Sep 30, 2020 at 01:53:46PM +0200, Alexandre Bailon wrote:
>> This adds a RPMsg driver that implements communication between the CPU and an
>> APU.
>> This uses VirtIO buffer to exchange messages but for sharing data, this uses
>> a dmabuf, mapped to be shared between CPU (userspace) and APU.
>> The driver is relatively generic, and should work with any SoC implementing
>> hardware accelerator for AI if they use support remoteproc and VirtIO.
>>
>> For the people interested by the firmware or userspace library,
>> the sources are available here:
>> https://github.com/BayLibre/open-amp/tree/v2020.01-mtk/apps/examples/apu
> Since this has open userspace (from a very cursory look), and smells very
> much like an acceleration driver, and seems to use dma-buf for memory
> management: Why is this not just a drm driver?

I have never though to DRM since for me it was only a RPMsg driver.
I don't know well DRM. Could you tell me how you would do it so I could 
have a look ?

Thanks,
Alexandre

> -Daniel
>
>> Alexandre Bailon (3):
>>    Add a RPMSG driver for the APU in the mt8183
>>    rpmsg: apu_rpmsg: update the way to store IOMMU mapping
>>    rpmsg: apu_rpmsg: Add an IOCTL to request IOMMU mapping
>>
>> Julien STEPHAN (1):
>>    rpmsg: apu_rpmsg: Add support for async apu request
>>
>>   drivers/rpmsg/Kconfig          |   9 +
>>   drivers/rpmsg/Makefile         |   1 +
>>   drivers/rpmsg/apu_rpmsg.c      | 752 +++++++++++++++++++++++++++++++++
>>   drivers/rpmsg/apu_rpmsg.h      |  52 +++
>>   include/uapi/linux/apu_rpmsg.h |  47 +++
>>   5 files changed, 861 insertions(+)
>>   create mode 100644 drivers/rpmsg/apu_rpmsg.c
>>   create mode 100644 drivers/rpmsg/apu_rpmsg.h
>>   create mode 100644 include/uapi/linux/apu_rpmsg.h
>>
>> -- 
>> 2.26.2
>>
>> _______________________________________________
>> dri-devel mailing list
>> dri-devel@...ts.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/dri-devel

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