[RFC][Patch v1 0/2] iommu/arm-smmu-v3: Add NVIDIA implementation
Nicolin Chen
nicolinc at nvidia.com
Fri Jul 23 12:31:38 PDT 2021
From: Nicolin Chen <nicoleotsuka at gmail.com>
The SMMUv3 devices implemented in the Grace SoC support NVIDIA's custom
CMDQ-Virtualization (CMDQV) hardware. Like the new ECMDQ feature first
introduced in the ARM SMMUv3.3 specification, CMDQV adds multiple VCMDQ
interfaces to supplement the single architected SMMU_CMDQ in an effort
to reduce contention.
This patch series adds CMDQV support to the arm-smmu-v3 driver by first
borrowing the implementation infrastructure from the arm-smmu driver.
The NVIDIA implementation is then introduced along with hooks allowing
implmentations to specify custom issue_cmdlist methods. Additionally,
the original issue_cmdlist and supporting methods in the arm-smmu-v3
driver are reworked to support alternative CMDQs.
[ nicolinc: this v1 is more of base changes for CMDQV driver; while I
am still integrating incremental features based on VFIO mdev, I sent
these two out in order to collect comments and suggestions to see if
the overall structure is promising. I will add more changes in v2 or
later versions for more detailed implementations. Thank you! ]
Nate Watterson (2):
iommu/arm-smmu-v3: Add implementation infrastructure
iommu/arm-smmu-v3: Add support for NVIDIA CMDQ-Virtualization hw
MAINTAINERS | 2 +
drivers/iommu/arm/arm-smmu-v3/Makefile | 2 +-
.../iommu/arm/arm-smmu-v3/arm-smmu-v3-impl.c | 15 +
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 71 +--
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 15 +
.../iommu/arm/arm-smmu-v3/nvidia-smmu-v3.c | 425 ++++++++++++++++++
6 files changed, 503 insertions(+), 27 deletions(-)
create mode 100644 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-impl.c
create mode 100644 drivers/iommu/arm/arm-smmu-v3/nvidia-smmu-v3.c
--
2.17.1
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