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

[Daniel Vetter]

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?
-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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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch