Add stall support to the SMMUv3 driver, along with a common I/O Page
Fault handler.
Since v12 [1]:
* Fixed failure path of arm_smmu_insert_master(), in patch 07 (Keqian
Zhu)
* In arm_smmu_handle_evt(), patch 10, don't report IPA field on stage-1
faults, and report accurate fault reason (Eric Auger)
* Fix possible use-after-free in arm_smmu_handle_evt(), patch 10: if a
master is removed while we handle its events, we could in theory
dereference a freed master struct. Hold streams_mutex while using a
master struct obtained with arm_smmu_find_master().
Future work regarding IOPF:
* Keep stall disabled by default, only enable it per CD when drivers
request it [2][3].
* Add PRI support to SMMUv3.
* Route all recoverable faults through io-pgfault.c, so we can track
partial faults better [4].
* Nested IOPF [5].
[1]
https://lore.kernel.org/linux-iommu/20210127154322.3959196-1-jean-phili...@linaro.org/
[2]
https://lore.kernel.org/linux-iommu/22fa4120-eadf-20d5-0d0a-9935aa0f1...@hisilicon.com/
[3] https://lore.kernel.org/linux-iommu/YAhui7UOw7743shI@myrica/
[4] https://lore.kernel.org/kvm/YB0f5Yno9frihQq4@myrica/
[5]
https://lore.kernel.org/linux-acpi/mwhpr11mb188653af6efa0e55de17815f8c...@mwhpr11mb1886.namprd11.prod.outlook.com/
Jean-Philippe Brucker (10):
iommu: Fix comment for struct iommu_fwspec
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 | 56 ++-
drivers/iommu/iommu-sva-lib.h | 53 ++
include/linux/iommu.h | 26 +-
drivers/acpi/arm64/iort.c | 15 +-
.../iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c | 59 ++-
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 354 --
drivers/iommu/intel/iommu.c | 11 +-
drivers/iommu/io-pgfault.c| 461 ++
drivers/iommu/of_iommu.c | 5 -
drivers/misc/uacce/uacce.c| 39 +-
12 files changed, 1024 insertions(+), 74 deletions(-)
create mode 100644 drivers/iommu/io-pgfault.c
--
2.30.1
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