[PATCH v3 0/5] Add support for Verisilicon IOMMU used by media codec blocks

[Benjamin Gaignard]

Hi all,

This patch series adds support for the Verisilicon IOMMU, which is found in front
of hardware encoder and decoder blocks in several SoCs using Verisilicon IP. 
A first implementation of this IOMMU is available on the Rockchip RK3588 SoC.

Rockchip provides a driver for this hardware in their 6.1 kernel branch:
https://github.com/rockchip-linux/kernel/blob/develop-6.1/drivers/iommu/rockchip-iommu-av1d.c

This series includes:
- a new binding for the Verisilicon IOMMU
- a basic driver implementation
- DT updates for RK3588

The driver was forward-ported from Rockchip’s 6.1 implementation, 
the prefix was renamed to vsi for generality, and several fixes were applied.

AV1 decoding was tested using the stateless VPU driver and Fluster.
The test results show a score of 205/239, which confirms that no regressions
were introduced by this series.

Feedback and testing welcome.

changes in version 3:
- Change compatible to "rockchip,rk3588-iommu-1.2"
- Fix compatible in .yaml
- Update DT and driver to use "rockchip,rk3588-iommu-1.2" compatible
- Set CONFIG_VSI_IOMMU as module in defconfig
- Create an identity domain for the driver
- Fix double flush issue
- Rework attach/detach logic
- Simplify xlate function
- Discover iommu device like done in ARM driver
- Remove ARM_DMA_USE_IOMMU from Kconfig

changes in version 2:
- Add a compatible "rockchip,rk3588-av1-iommu"
- Fix clock-names in binding 
- Remove "vsi_mmu" label in binding example.
- Rework driver probe function
- Remove double flush
- Rework driver internal structures and avoid allocate
  in xlate function.
- Do not touch to VPU driver anymore (path removed)
- Add a patch to enable the driver in arm64 defconfig

Benjamin Gaignard (5):
  dt-bindings: vendor-prefixes: Add Verisilicon
  dt-bindings: iommu: verisilicon: Add binding for VSI IOMMU
  iommu: Add verisilicon IOMMU driver
  arm64: dts: rockchip: Add verisilicon IOMMU node on RK3588
  arm64: defconfig: enable Verisilicon IOMMU

 .../bindings/iommu/verisilicon,iommu.yaml     |  71 ++
 .../devicetree/bindings/vendor-prefixes.yaml  |   2 +
 arch/arm64/boot/dts/rockchip/rk3588-base.dtsi |  11 +
 arch/arm64/configs/defconfig                  |   1 +
 drivers/iommu/Kconfig                         |  11 +
 drivers/iommu/Makefile                        |   1 +
 drivers/iommu/vsi-iommu.c                     | 874 ++++++++++++++++++
 7 files changed, 971 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iommu/verisilicon,iommu.yaml
 create mode 100644 drivers/iommu/vsi-iommu.c

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2.43.0