Add Tegra194 Dual ARM SMMU driver

Krishna Reddy linux-arm-kernel linux-iommu linux-tegra lkml 4 versions Oct 23, 2018 – Dec 4, 2018 New

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Versions newest first · linked by author and title

v3 Latest Dec 4, 20180 of 5 patches 0 repliesNew
v2 posting 2/2 Oct 31, 20185 patches 1 replySuperseded
v2 posting 1/2 Oct 31, 20180 of 5 patches 2 repliesSuperseded

Earlier versions · 1

Version	Posted	Patches	Replies	Status
v1	Oct 23, 2018	3 patches	1 reply	Superseded

Changes in v3 from the cover letter

* Created library for ARM SMMU based on arm-smmu.c
* Added support to program multiple ARM SMMU instances identically
* Updated arm-smmu.c/tegra194-smmu.c to use ARM SMMU library functions

Patches in v3 No applies recorded yet

None of the 5 patches the cover letter announces are in this archive.

Reviews trailers per patch

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Read the v3 thread

Cover letter [PATCH v3 0/5] Add Tegra194 Dual ARM SMMU driver

NVIDIA's Xavier (Tegra194) SOC has two ARM SMMU(MMU-500) instances, which are used as one SMMU device in HW. The IOVA accesses from HW devices are interleaved across these two SMMU instances and need to be programmed identical.

The existing ARM SMMU driver can't be used in its current form for programming the two SMMU instances identically. But, Most of the code can be shared between ARM SMMU driver and Tegra194 SMMU driver. To allow sharing the code, Created a libray based on the current ARM SMMU driver and added suppport to program multiple ARM SMMU Instances identically. Upated Current ARM SMMU driver and Tegra194 SMMU driver to use the library functions.

Please review the patches and provide feedback.

Changes in v2:
* Added CONFIG_ARM_SMMU_TEGRA to protect Tegra194 SMMU driver compilation
* Enabled CONFIG_ARM_SMMU_TEGRA in defconfig
* Added SMMU nodes in Tegra194 device tree

Changes in v3:
* Created library for ARM SMMU based on arm-smmu.c
* Added support to program multiple ARM SMMU instances identically
* Updated arm-smmu.c/tegra194-smmu.c to use ARM SMMU library functions

Krishna Reddy (6):
iommu/arm-smmu: create library for ARM SMMU iommu/arm-smmu: Add support to program multiple ARM SMMU's identically iommu/arm-smmu: update arm-smmu.c to use ARM SMMU library iommu/tegra194_smmu: Add Tegra194 SMMU driver
arm64: defconfig: Enable ARM_SMMU_TEGRA
arm64: tegra: Add SMMU nodes to Tegra194 device tree

 arch/arm64/boot/dts/nvidia/tegra194.dtsi |  148 +++
 arch/arm64/configs/defconfig             |    1 +
 drivers/iommu/Kconfig                    |   11 +
 drivers/iommu/Makefile                   |    2 +
 drivers/iommu/arm-smmu.c                 | 1709 +----------------------------
 drivers/iommu/lib-arm-smmu.c             | 1768 ++++++++++++++++++++++++++++++
 drivers/iommu/lib-arm-smmu.h             |  161 +++
 drivers/iommu/tegra194-smmu.c            |  394 +++++++
 8 files changed, 2496 insertions(+), 1698 deletions(-)
 create mode 100644 drivers/iommu/lib-arm-smmu.c
 create mode 100644 drivers/iommu/lib-arm-smmu.h
 create mode 100644 drivers/iommu/tegra194-smmu.c

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Read the cover letter in its thread