[PATCH v2 00/13] iommu: Define EINVAL as device/domain incompatibility

[Nicolin Chen]

This series is to replace the previous EMEDIUMTYPE patch in a VFIO series:
https://lore.kernel.org/kvm/Yxnt9uQTmbqul5lf@xxxxxxxxxx/

The purpose is to regulate all existing ->attach_dev callback functions to
use EINVAL exclusively for an incompatibility error between a device and a
domain. This allows VFIO and IOMMUFD to detect such a soft error, and then
try a different domain with the same device.

Among all the patches, the first two are preparatory changes. And then one
patch to update kdocs and the rest of them are per-driver changes.

Although it might be ideal to merge the previous VFIO series together with
this series, given the number of new changes, the review in the IOMMU list
might need a couple of rounds to finalize. Also, considering that v6.0 is
at rc5 now, perhaps we could merge this IOMMU series and the VFIO one in
different cycles to avoid merge conflicts. If there's less concern for it,
I can respin the finalized version with VFIO to merge into the VFIO tree.

This series is also available on Github:
https://github.com/nicolinc/iommufd/commits/iommu_attach_dev-v2

Changelog
v2:
 * Fixed kdocs format
 * Grouped with the virtio patch from Jean (with a small change)
 * Separated previous ENODEV and EINVAL changes to per-driver ones
 * Redone some of the changes to have explicit return values in the
   ->attach_dev() callback functions or their direct sub-functions.
v1: https://lore.kernel.org/linux-iommu/20220913082448.31120-1-nicolinc@xxxxxxxxxx/

Thanks!

Jean-Philippe Brucker (1):
  iommu/virtio: Constrain return value of ->attach_dev()

Nicolin Chen (12):
  iommu/msm: Add missing __disable_clocks calls
  iommu/amd: Drop unnecessary checks in amd_iommu_attach_device()
  iommu: Add return value rules to attach_dev op
  iommu/arm: Constrain return value of ->attach_dev()
  iommu/fsl: Constrain return value of ->attach_dev()
  iommu/intel: Constrain return value of ->attach_dev()
  iommu/ipmmu-vmsa: Constrain return value of ->attach_dev()
  iommu/mtk: Constrain return value of ->attach_dev()
  iommu/omap: Constrain return value of ->attach_dev()
  iommu/rockchip: Constrain return value of ->attach_dev()
  iommu/sprd: Constrain return value of ->attach_dev()
  iommu/tegra: Constrain return value of ->attach_dev()

 drivers/iommu/amd/iommu.c                   | 12 ++----------
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 13 ++-----------
 drivers/iommu/arm/arm-smmu/arm-smmu.c       |  7 ++-----
 drivers/iommu/arm/arm-smmu/qcom_iommu.c     |  9 ++-------
 drivers/iommu/fsl_pamu_domain.c             | 12 ++++++++----
 drivers/iommu/intel/iommu.c                 | 17 +++++++++--------
 drivers/iommu/ipmmu-vmsa.c                  | 10 +++++-----
 drivers/iommu/msm_iommu.c                   |  2 ++
 drivers/iommu/mtk_iommu.c                   |  9 +++++++--
 drivers/iommu/omap-iommu.c                  |  7 ++++---
 drivers/iommu/rockchip-iommu.c              |  4 +++-
 drivers/iommu/sprd-iommu.c                  |  4 +---
 drivers/iommu/tegra-gart.c                  |  2 +-
 drivers/iommu/tegra-smmu.c                  |  6 ++++--
 drivers/iommu/virtio-iommu.c                | 13 ++++++-------
 include/linux/iommu.h                       | 11 +++++++++++
 16 files changed, 69 insertions(+), 69 deletions(-)

-- 
2.17.1