This adds a DRM driver that implements communication between the CPU and an APU. This uses VirtIO buffer to exchange messages. For the data, we allocate a GEM object and map it using IOMMU to make it available to the 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 This RFC is a rewrite of a previous RFC that was not using DRM: https://patchwork.kernel.org/project/linux-remoteproc/cover/20200930115350.5272-1-abailon@xxxxxxxxxxxx/ Alexandre Bailon (4): dt-bindings: Add bidings for mtk,apu-drm DRM: Add support of AI Processor Unit (APU) rpmsg: Add support of AI Processor Unit (APU) ARM64: mt8183-pumpkin: Add the APU DRM device .../devicetree/bindings/gpu/mtk,apu-drm.yaml | 38 ++ .../boot/dts/mediatek/mt8183-pumpkin.dts | 6 + drivers/gpu/drm/Kconfig | 2 + drivers/gpu/drm/Makefile | 1 + drivers/gpu/drm/apu/Kconfig | 10 + drivers/gpu/drm/apu/Makefile | 7 + drivers/gpu/drm/apu/apu_drm_drv.c | 238 +++++++ drivers/gpu/drm/apu/apu_gem.c | 232 +++++++ drivers/gpu/drm/apu/apu_internal.h | 89 +++ drivers/gpu/drm/apu/apu_sched.c | 634 ++++++++++++++++++ drivers/rpmsg/Kconfig | 10 + drivers/rpmsg/Makefile | 1 + drivers/rpmsg/apu_rpmsg.c | 184 +++++ include/drm/apu_drm.h | 59 ++ include/uapi/drm/apu_drm.h | 106 +++ 15 files changed, 1617 insertions(+) create mode 100644 Documentation/devicetree/bindings/gpu/mtk,apu-drm.yaml create mode 100644 drivers/gpu/drm/apu/Kconfig create mode 100644 drivers/gpu/drm/apu/Makefile create mode 100644 drivers/gpu/drm/apu/apu_drm_drv.c create mode 100644 drivers/gpu/drm/apu/apu_gem.c create mode 100644 drivers/gpu/drm/apu/apu_internal.h create mode 100644 drivers/gpu/drm/apu/apu_sched.c create mode 100644 drivers/rpmsg/apu_rpmsg.c create mode 100644 include/drm/apu_drm.h create mode 100644 include/uapi/drm/apu_drm.h -- 2.31.1
