[PATCH v9 00/10] iommu: I/O page faults for SMMUv3

Jean-Philippe Brucker
2021-01-08T15:03:10Z

Add stall support to the SMMUv3, along with a common I/O Page Fault
handler.

Changes since v8 [1]:
* Added patches 1 and 2 which aren't strictly related to IOPF but need to
be applied in order - 8 depends on 2 which depends on 1. Patch 2 moves
pasid-num-bits to a device property, following Robin's comment on v8.
* Patches 3-5 extract the IOPF feature from the SVA one, to support SVA
implementations that handle I/O page faults through the device driver
rather than the IOMMU driver [2]
* Use device properties for dma-can-stall, instead of a special fwspec
member.
* Dropped PRI support for now, since it doesn't seem to be available in
hardware and adds some complexity.
* Had to drop some Acks and Tested tags unfortunately, due to code
changes.

As usual, you can get the latest SVA patches from
http://jpbrucker.net/git/linux sva/current

[1] https://lore.kernel.org/linux-iommu/20201112125519.3987595-1-jean-philippe@linaro.org/
[2] https://lore.kernel.org/linux-iommu/BY5PR12MB3764F5D07E8EC48327E39C86B3C60@BY5PR12MB3764.namprd12.prod.outlook.com/

Jean-Philippe Brucker (10):
iommu: Remove obsolete comment
iommu/arm-smmu-v3: Use device properties for pasid-num-bits
iommu: Separate IOMMU_DEV_FEAT_IOPF from IOMMU_DEV_FEAT_SVA
iommu/vt-d: Support IOMMU_DEV_FEAT_IOPF
uacce: Enable IOMMU_DEV_FEAT_IOPF
iommu: Add a page fault handler
iommu/arm-smmu-v3: Maintain a SID->device structure
dt-bindings: document stall property for IOMMU masters
ACPI/IORT: Enable stall support for platform devices
iommu/arm-smmu-v3: Add stall support for platform devices

drivers/iommu/Makefile | 1 +
.../devicetree/bindings/iommu/iommu.txt | 18 +
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 74 ++-
drivers/iommu/iommu-sva-lib.h | 53 ++
include/linux/iommu.h | 25 +-
drivers/acpi/arm64/iort.c | 15 +-
.../iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c | 70 ++-
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 354 ++++++++++++--
drivers/iommu/intel/iommu.c | 11 +-
drivers/iommu/io-pgfault.c | 462 ++++++++++++++++++
drivers/iommu/of_iommu.c | 5 -
drivers/misc/uacce/uacce.c | 32 +-
12 files changed, 1046 insertions(+), 74 deletions(-)
create mode 100644 drivers/iommu/io-pgfault.c

--
2.29.2