An impl driver might support its own vIOMMU object, as the following patch
will add IOMMU_VIOMMU_TYPE_TEGRA241_CMDQV.
Add a vsmmu_alloc op to give impl a try, upon failure fallback to standard
vsmmu allocation for IOMMU_VIOMMU_TYPE_ARM_SMMUV3.
Signed-off-by: Nicolin Chen <nicol...@nvidia.com>
---
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 6 ++++++
.../iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c | 17 +++++++++++------
2 files changed, 17 insertions(+), 6 deletions(-)
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
index 6b8f0d20dac3..a5835af72417 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
@@ -16,6 +16,7 @@
#include <linux/sizes.h>
struct arm_smmu_device;
+struct arm_smmu_domain;
/* MMIO registers */
#define ARM_SMMU_IDR0 0x0
@@ -720,6 +721,11 @@ struct arm_smmu_impl_ops {
int (*init_structures)(struct arm_smmu_device *smmu);
struct arm_smmu_cmdq *(*get_secondary_cmdq)(
struct arm_smmu_device *smmu, struct arm_smmu_cmdq_ent *ent);
+ struct arm_vsmmu *(*vsmmu_alloc)(
+ struct arm_smmu_device *smmu,
+ struct arm_smmu_domain *smmu_domain, struct iommufd_ctx *ictx,
+ unsigned int viommu_type,
+ const struct iommu_user_data *user_data);
};
/* An SMMUv3 instance */
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c
b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c
index 66855cae775e..aa8653af50f2 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c
@@ -392,10 +392,7 @@ struct iommufd_viommu *arm_vsmmu_alloc(struct device *dev,
iommu_get_iommu_dev(dev, struct arm_smmu_device, iommu);
struct arm_smmu_master *master = dev_iommu_priv_get(dev);
struct arm_smmu_domain *s2_parent = to_smmu_domain(parent);
- struct arm_vsmmu *vsmmu;
-
- if (viommu_type != IOMMU_VIOMMU_TYPE_ARM_SMMUV3)
- return ERR_PTR(-EOPNOTSUPP);
+ struct arm_vsmmu *vsmmu = NULL;
if (!(smmu->features & ARM_SMMU_FEAT_NESTING))
return ERR_PTR(-EOPNOTSUPP);
@@ -423,8 +420,16 @@ struct iommufd_viommu *arm_vsmmu_alloc(struct device *dev,
!(smmu->features & ARM_SMMU_FEAT_S2FWB))
return ERR_PTR(-EOPNOTSUPP);
- vsmmu = iommufd_viommu_alloc(ictx, struct arm_vsmmu, core,
- &arm_vsmmu_ops);
+ if (master->smmu->impl_ops && master->smmu->impl_ops->vsmmu_alloc)
+ vsmmu = master->smmu->impl_ops->vsmmu_alloc(
+ master->smmu, s2_parent, ictx, viommu_type, user_data);
+ if (PTR_ERR(vsmmu) == -EOPNOTSUPP) {
+ if (viommu_type != IOMMU_VIOMMU_TYPE_ARM_SMMUV3)
+ return ERR_PTR(-EOPNOTSUPP);
+ /* Fallback to standard SMMUv3 type if viommu_type matches */
+ vsmmu = iommufd_viommu_alloc(ictx, struct arm_vsmmu, core,
+ &arm_vsmmu_ops);
+ }
if (IS_ERR(vsmmu))
return ERR_CAST(vsmmu);
--
2.43.0
