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 series of patches add CMDQV support with its preparational changes:
* PATCH-1 to PATCH-8 are related to shared VMID feature: they are used
first to improve TLB utilization, second to bind a shared VMID with a
VCMDQ interface for hardware configuring requirement.
* PATCH-9 and PATCH-10 are to accommodate the NVIDIA implementation with
the existing arm-smmu-v3 driver.
* PATCH-11 borrows the "implementation infrastructure" from the arm-smmu
driver so later change can build upon it.
* PATCH-12 adds an initial NVIDIA implementation related to host feature,
and also adds implementation specific ->device_reset() and ->get_cmdq()
callback functions.
* PATCH-13 adds virtualization features using VFIO mdev interface, which
allows user space hypervisor to map and get access to one of the VCMDQ
interfaces of CMDQV module.
( Thinking that reviewers can get a better view of this implementation,
I am attaching QEMU changes here for reference purpose:
https://github.com/nicolinc/qemu/commits/dev/cmdqv_v6.0.0-rc2
The branch has all preparational changes, while I'm still integrating
device model and ARM-VIRT changes, and will push them these two days,
although they might not be in a good shape of being sent to review yet )
Above all, I marked RFC for this series, as I feel that we may come up
some better solution. So please kindly share your reviews and insights.
Thank you!
Changelog
v1->v2:
* Added mdev interface support for hypervisor and VMs.
* Added preparational changes for mdev interface implementation.
* PATCH-12 Changed ->issue_cmdlist() to ->get_cmdq() for a better
integration with recently merged ECMDQ-related changes.
Nate Watterson (3):
iommu/arm-smmu-v3: Add implementation infrastructure
iommu/arm-smmu-v3: Add support for NVIDIA CMDQ-Virtualization hw
iommu/nvidia-smmu-v3: Add mdev interface support
Nicolin Chen (10):
iommu: Add set_nesting_vmid/get_nesting_vmid functions
vfio: add VFIO_IOMMU_GET_VMID and VFIO_IOMMU_SET_VMID
vfio: Document VMID control for IOMMU Virtualization
vfio: add set_vmid and get_vmid for vfio_iommu_type1
vfio/type1: Implement set_vmid and get_vmid
vfio/type1: Set/get VMID to/from iommu driver
iommu/arm-smmu-v3: Add shared VMID support for NESTING
iommu/arm-smmu-v3: Add VMID alloc/free helpers
iommu/arm-smmu-v3: Pass dev pointer to arm_smmu_detach_dev
iommu/arm-smmu-v3: Pass cmdq pointer in arm_smmu_cmdq_issue_cmdlist()
Documentation/driver-api/vfio.rst | 34 +
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 | 121 +-
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 18 +
.../iommu/arm/arm-smmu-v3/nvidia-smmu-v3.c | 1249 +++++++++++++++++
drivers/iommu/iommu.c | 20 +
drivers/vfio/vfio.c | 25 +
drivers/vfio/vfio_iommu_type1.c | 37 +
include/linux/iommu.h | 5 +
include/linux/vfio.h | 2 +
include/uapi/linux/vfio.h | 26 +
13 files changed, 1537 insertions(+), 19 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
