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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