On 19/07/17 10:33, Anup Patel wrote:

This patchset primarily adds Broadcom FlexRM reset module for
VFIO platform driver. We also have minor improvments in IOMMU
and VFIO driver to allow VFIO no-IOMMU mode access to FlexRM.

I'm struggling to understand the IOMMU changes here - what's the
FlexRM's hardware relationship with the IOMMU, and how is it different
from any other device? Furthermore, if there *is* a relevant IOMMU
present, why would no-IOMMU mode need to be involved at all?

Robin.

The patches are based on Linux-4.13-rc1 and can also be
found at flexrm-vfio-v1 branch of
https://github.com/Broadcom/arm64-linux.git

Anup Patel (5):
  iommu: Add capability IOMMU_CAP_BYPASS
  iommu/arm-smmu: add IOMMU_CAP_BYPASS to the ARM SMMU driver
  iommu/arm-smmu-v3: add IOMMU_CAP_BYPASS to the ARM SMMUv3 driver
  vfio: Allow No-IOMMU mode for IOMMUs with bypass capability
  vfio: platform: reset: Add Broadcom FlexRM reset module

 drivers/iommu/arm-smmu-v3.c                        |  2 +
 drivers/iommu/arm-smmu.c                           |  2 +
 drivers/vfio/platform/reset/Kconfig                |  9 +++
 drivers/vfio/platform/reset/Makefile               |  1 +
 .../vfio/platform/reset/vfio_platform_bcmflexrm.c  | 91 ++++++++++++++++++++++
 drivers/vfio/vfio.c                                | 13 +++-
 include/linux/iommu.h                              |  4 +
 7 files changed, 119 insertions(+), 3 deletions(-)
 create mode 100644 drivers/vfio/platform/reset/vfio_platform_bcmflexrm.c