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_api.c | 14 ++++++++++++++ include/linux/iommufd.h | 8 ++++++++ 2 files changed, 22 insertions(+)
diff --git a/drivers/iommu/iommufd/viommu_api.c b/drivers/iommu/iommufd/viommu_api.c index e0ee592ce834..3772a5892a6c 100644 --- a/drivers/iommu/iommufd/viommu_api.c +++ b/drivers/iommu/iommufd/viommu_api.c @@ -37,3 +37,17 @@ struct device *iommufd_viommu_find_device(struct iommufd_viommu *viommu, u64 id) return vdev_id->idev->dev; } EXPORT_SYMBOL_NS_GPL(iommufd_viommu_find_device, IOMMUFD); + +/* + * Convert a viommu to its encapsulated nest parent domain. Caller must be aware + * of the lifecycle of the viommu pointer. Only call this function in a callback + * function where viommu is passed in by the iommu/iommufd core. + */ +struct iommu_domain * +iommufd_viommu_to_parent_domain(struct iommufd_viommu *viommu) +{ + if (!viommu || !viommu->hwpt) + return NULL; + return viommu->hwpt->common.domain; +} +EXPORT_SYMBOL_NS_GPL(iommufd_viommu_to_parent_domain, IOMMUFD); diff --git a/include/linux/iommufd.h b/include/linux/iommufd.h index 364f151d281d..f7c265c6de7c 100644 --- a/include/linux/iommufd.h +++ b/include/linux/iommufd.h @@ -92,6 +92,8 @@ int iommufd_vfio_compat_set_no_iommu(struct iommufd_ctx *ictx); void iommufd_viommu_lock_vdev_id(struct iommufd_viommu *viommu); void iommufd_viommu_unlock_vdev_id(struct iommufd_viommu *viommu); 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) { @@ -145,5 +147,11 @@ struct device *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