[PATCH v13 0/6] Add support for Verisilicon IOMMU used by media

[Benjamin Gaignard <benjamin.gaignard@collabora.com>]

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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 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 13:
 - On top the driver file explicit why the hardware is different than Rockchip IOMMU
 - Document why vsi_iommu_restore_ctx() is needed when using Verisilicon
   stateless video decoder.

changes in version 12:
- Remove useless vsi_iommu_flush_tlb_all()
- Merge MAINTAINERS changes in the patch introducing VSI iommu driver

changes in version 11:
- Fix dependency issue when decoder driver is build as module.

changes in version 10:
- Update vsi_iommu_identity_attach() and vsi_iommu_attach_device()
  prototypes.
- Fix build as module issue when Verisilicon video decoder is built-in.
- Rebase on master branch.

changes in version 9:
- removing blanks lines.

Benjamin Gaignard (6):
  dt-bindings: vendor-prefixes: Add Verisilicon
  dt-bindings: iommu: verisilicon: Add binding for VSI IOMMU
  iommu: Add verisilicon IOMMU driver
  media: verisilicon: AV1: Restore IOMMU context before decoding a frame
  arm64: dts: rockchip: Add verisilicon IOMMU node on RK3588
  arm64: defconfig: enable Verisilicon IOMMU for Rockchip RK3588

 .../bindings/iommu/verisilicon,iommu.yaml     |  71 ++
 .../devicetree/bindings/vendor-prefixes.yaml  |   2 +
 MAINTAINERS                                   |   8 +
 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                     | 794 ++++++++++++++++++
 .../verisilicon/rockchip_vpu981_hw_av1_dec.c  |  15 +
 include/linux/vsi-iommu.h                     |  21 +
 10 files changed, 935 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/iommu/verisilicon,iommu.yaml
 create mode 100644 drivers/iommu/vsi-iommu.c
 create mode 100644 include/linux/vsi-iommu.h

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