[PATCH v5 24/29] iommu/arm-smmu-v3-iommufd: Add hw_info to impl_ops

Nicolin Chen
2025-05-18T04:15:43Z

This will be used by Tegra241 CMDQV implementation to report a non-default
HW info data.

Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
---
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 1 +
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c | 8 ++++++--
2 files changed, 7 insertions(+), 2 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 a455ff97e53e..8328c8cc1899 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
@@ -727,6 +727,7 @@ struct arm_smmu_impl_ops {
struct arm_smmu_domain *smmu_domain, struct iommufd_ucmd *ucmd,
unsigned int viommu_type,
const struct iommu_user_data *user_data);
+ void *(*hw_info)(struct arm_smmu_device *smmu, u32 *length, u32 *type);
};

/* 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 8a13d0102c05..837f15e2d40f 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
@@ -10,13 +10,17 @@
void *arm_smmu_hw_info(struct device *dev, u32 *length, u32 *type)
{
struct arm_smmu_master *master = dev_iommu_priv_get(dev);
+ const struct arm_smmu_impl_ops *impl_ops = master->smmu->impl_ops;
struct iommu_hw_info_arm_smmuv3 *info;
u32 __iomem *base_idr;
unsigned int i;

if (*type != IOMMU_HW_INFO_TYPE_DEFAULT &&
- *type != IOMMU_HW_INFO_TYPE_ARM_SMMUV3)
- return ERR_PTR(-EOPNOTSUPP);
+ *type != IOMMU_HW_INFO_TYPE_ARM_SMMUV3) {
+ if (!impl_ops || !impl_ops->hw_info)
+ return ERR_PTR(-EOPNOTSUPP);
+ return impl_ops->hw_info(master->smmu, length, type);
+ }

info = kzalloc(sizeof(*info), GFP_KERNEL);
if (!info)
--
2.43.0