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Subject: Re: [RFC PATCH 0/4] Add a RPMsg driver to support AI Processing Unit
 (APU)
To:     linux-remoteproc@vger.kernel.org, ohad@wizery.com,
        gpain@baylibre.com, stephane.leprovost@mediatek.com,
        jstephan@baylibre.com, linux-kernel@vger.kernel.org,
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        mturquette@baylibre.com, bjorn.andersson@linaro.org,
        christian.koenig@amd.com, linux-media@vger.kernel.org
References: <20200930115350.5272-1-abailon@baylibre.com>
 <20201001084856.GC438822@phenom.ffwll.local>
From:   Alexandre Bailon <abailon@baylibre.com>
Message-ID: <8e4bb739-c3b3-d790-e8e3-dd5df2d6f869@baylibre.com>
Date:   Thu, 1 Oct 2020 19:28:27 +0200
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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
>>
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