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

[Alexandre Bailon]

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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