[PATCH v1 13/16] iommufd/viommu: Add iommufd_viommu_to_parent_domain helper

Nicolin Chen
2024-08-07T20:11:45Z

Allow an IOMMU driver to convert a core-managed viommu to a nested parent
domain for the info that the domain holds.

Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
---
drivers/iommu/iommufd/viommu.c | 8 ++++++++
include/linux/iommufd.h | 8 ++++++++
2 files changed, 16 insertions(+)

diff --git a/drivers/iommu/iommufd/viommu.c b/drivers/iommu/iommufd/viommu.c
index 2304f199b033..39a7c04c4132 100644
--- a/drivers/iommu/iommufd/viommu.c
+++ b/drivers/iommu/iommufd/viommu.c
@@ -239,3 +239,11 @@ int iommufd_viommu_invalidate(struct iommufd_ucmd *ucmd)
return -EFAULT;
return rc;
}
+
+struct iommu_domain *
+iommufd_viommu_to_parent_domain(struct iommufd_viommu *viommu)
+{
+ if (!viommu || !viommu->hwpt)
+ return NULL;
+ return viommu->hwpt->common.domain;
+}
diff --git a/include/linux/iommufd.h b/include/linux/iommufd.h
index e0d7a53acbd5..c0ce12cb1374 100644
--- a/include/linux/iommufd.h
+++ b/include/linux/iommufd.h
@@ -91,6 +91,8 @@ int iommufd_vfio_compat_ioas_create(struct iommufd_ctx *ictx);
int iommufd_vfio_compat_set_no_iommu(struct iommufd_ctx *ictx);
struct device *
iommufd_viommu_find_device(struct iommufd_viommu *viommu, u64 id);
+struct iommu_domain *
+iommufd_viommu_to_parent_domain(struct iommufd_viommu *viommu);
#else /* !CONFIG_IOMMUFD */
static inline struct iommufd_ctx *iommufd_ctx_from_file(struct file *file)
{
@@ -137,5 +139,11 @@ iommufd_viommu_find_device(struct iommufd_viommu *viommu, u64 id)
{
return NULL;
}
+
+static inline struct iommu_domain *
+iommufd_viommu_to_parent_domain(struct iommufd_viommu *viommu)
+{
+ return NULL;
+}
#endif /* CONFIG_IOMMUFD */
#endif
--
2.43.0