[PATCH v5 0/8] iommu: Remove IOMMU_DEV_FEAT_SVA/_IOPF

Lu Baolu
2025-04-18T08:01:02Z

The new method for driver fault reporting support relies on the domain
to specify a iopf_handler. The driver should detect this and setup the
HW when fault capable domains are attached.

Move SMMUv3 to use this method and have VT-D validate support during
attach so that all three fault capable drivers have a no-op FEAT_SVA and
_IOPF. Then remove them.

This was initiated by Jason. I'm following up to remove FEAT_IOPF and
further clean up.

The whole series is also available at github:
https://github.com/LuBaolu/intel-iommu/commits/iommu_no_feat-v5

Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>

Change log:
v5:
- Rebased to v6.15-rc1. No functionality change.

v4: https://lore.kernel.org/linux-iommu/20250313051953.4064532-1-baolu.lu@linux.intel.com/
- Refined arm_smmu_disable_iopf() to improve code clarity.
- Separate patches for vt-d refactoring have been merged.
- All patches are based on the latest iommu/next branch to prevent
potential merge conflicts.

v3: https://lore.kernel.org/linux-iommu/20250228092631.3425464-1-baolu.lu@linux.intel.com/
- Series has been tested by Zhangfei Gao with arm-smmu-v3 driver.
- Refined some code according to Kevin's suggestions.
- No functional change.

v2: https://lore.kernel.org/linux-iommu/20250224051627.2956304-1-baolu.lu@linux.intel.com/
- Fix removing wrong nesting master_domain in
arm_smmu_remove_master_domain().
- Fix iopf enable/disable in iommufd mock driver for domain
replacement.

v1: https://lore.kernel.org/linux-iommu/20250214061104.1959525-1-baolu.lu@linux.intel.com/

Jason Gunthorpe (2):
iommu/arm-smmu-v3: Put iopf enablement in the domain attach path
iommu: Remove IOMMU_DEV_FEAT_SVA

Lu Baolu (6):
iommu/vt-d: Put iopf enablement in domain attach path
iommufd/selftest: Put iopf enablement in domain attach path
dmaengine: idxd: Remove unnecessary IOMMU_DEV_FEAT_IOPF
uacce: Remove unnecessary IOMMU_DEV_FEAT_IOPF
iommufd: Remove unnecessary IOMMU_DEV_FEAT_IOPF
iommu: Remove iommu_dev_enable/disable_feature()

drivers/accel/amdxdna/aie2_pci.c | 13 +-
drivers/dma/idxd/init.c | 43 +-----
drivers/iommu/amd/iommu.c | 34 -----
.../iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c | 86 +----------
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 136 ++++++++++--------
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 39 +----
drivers/iommu/intel/iommu.c | 71 +++++----
drivers/iommu/intel/iommu.h | 33 +++++
drivers/iommu/intel/nested.c | 16 ++-
drivers/iommu/intel/svm.c | 9 +-
drivers/iommu/iommu-sva.c | 3 -
drivers/iommu/iommu.c | 32 -----
drivers/iommu/iommufd/device.c | 59 ++++----
drivers/iommu/iommufd/eventq.c | 48 +------
drivers/iommu/iommufd/iommufd_private.h | 6 -
drivers/iommu/iommufd/selftest.c | 57 ++++++--
drivers/misc/uacce/uacce.c | 40 ------
include/linux/iommu.h | 35 -----
18 files changed, 262 insertions(+), 498 deletions(-)

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2.43.0