[PATCH v11 00/10] iommu: I/O page faults for SMMUv3

[Jean-Philippe Brucker <jean-philippe@linaro.org>]

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

This version fixes a typo introduced in v10 [1] and adds review tags
(thanks!) You can find the range diff for v10->v11 below.

[1] https://lore.kernel.org/linux-iommu/20210121123623.2060416-1-jean-philippe@linaro.org/

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   | 349 +++++++++++--
 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, 1019 insertions(+), 74 deletions(-)
 create mode 100644 drivers/iommu/io-pgfault.c


-- 
 @@ drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c: static void arm_smmu_release_device(struct device *dev)
    master = dev_iommu_priv_get(dev);
-   WARN_ON(arm_smmu_master_sva_enabled(master));
-+  iopf_queue_remove_device(master->smmu->evtq.iopf, dev);
+-  WARN_ON(arm_smmu_master_sva_enabled(master));
++  if (WARN_ON(arm_smmu_master_sva_enabled(master)))
++          iopf_queue_remove_device(master->smmu->evtq.iopf, dev);
    arm_smmu_detach_dev(master);
    arm_smmu_disable_pasid(master);
    arm_smmu_remove_master(master);
@@ drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c: static struct iommu_ops arm_smmu_op
    .pgsize_bitmap          = -1UL, /* Restricted during device attach */
  };
  
-@@ drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c: static int arm_smmu_cmdq_init(struct arm_smmu_device *smmu)
- static int arm_smmu_init_queues(struct arm_smmu_device *smmu)
- {
-   int ret;
-+  bool sva = smmu->features & ARM_SMMU_FEAT_STALLS;
- 
-   /* cmdq */
-   ret = arm_smmu_init_one_queue(smmu, &smmu->cmdq.q, ARM_SMMU_CMDQ_PROD,
 @@ drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c: static int arm_smmu_init_queues(struct arm_smmu_device *smmu)
    if (ret)
            return ret;
  
-+  if (sva && smmu->features & ARM_SMMU_FEAT_STALLS) {
++  if ((smmu->features & ARM_SMMU_FEAT_SVA) &&
++      (smmu->features & ARM_SMMU_FEAT_STALLS)) {
 +          smmu->evtq.iopf = iopf_queue_alloc(dev_name(smmu->dev));
 +          if (!smmu->evtq.iopf)
 +                  return -ENOMEM;