This helps drivers to get the dev pointer held by the vdev_id structure.
Signed-off-by: Nicolin Chen nicolinc@nvidia.com --- drivers/iommu/iommufd/viommu_api.c | 14 ++++++++++++++ include/linux/iommufd.h | 7 +++++++ 2 files changed, 21 insertions(+)
diff --git a/drivers/iommu/iommufd/viommu_api.c b/drivers/iommu/iommufd/viommu_api.c index 3772a5892a6c..82eb33e047cf 100644 --- a/drivers/iommu/iommufd/viommu_api.c +++ b/drivers/iommu/iommufd/viommu_api.c @@ -51,3 +51,17 @@ iommufd_viommu_to_parent_domain(struct iommufd_viommu *viommu) return viommu->hwpt->common.domain; } EXPORT_SYMBOL_NS_GPL(iommufd_viommu_to_parent_domain, IOMMUFD); + +/* + * Fetch the dev pointer in the vdev_id structure. Caller must make ensure the + * lifecycle of the vdev_id structure, likely by adding a driver-level lock to + * protect the passed-in vdev_id for any race against a potential unset_vdev_id + * callback. + */ +struct device *iommufd_vdev_id_to_dev(struct iommufd_vdev_id *vdev_id) +{ + if (!vdev_id || !vdev_id->viommu) + return NULL; + return vdev_id->idev->dev; +} +EXPORT_SYMBOL_NS_GPL(iommufd_vdev_id_to_dev, IOMMUFD); diff --git a/include/linux/iommufd.h b/include/linux/iommufd.h index c89583c7c792..88d6586a424f 100644 --- a/include/linux/iommufd.h +++ b/include/linux/iommufd.h @@ -99,6 +99,7 @@ void iommufd_access_unpin_pages(struct iommufd_access *access, unsigned long iova, unsigned long length); int iommufd_access_rw(struct iommufd_access *access, unsigned long iova, void *data, size_t len, unsigned int flags); +struct device *iommufd_vdev_id_to_dev(struct iommufd_vdev_id *vdev_id); int iommufd_vfio_compat_ioas_get_id(struct iommufd_ctx *ictx, u32 *out_ioas_id); int iommufd_vfio_compat_ioas_create(struct iommufd_ctx *ictx); int iommufd_vfio_compat_set_no_iommu(struct iommufd_ctx *ictx); @@ -138,6 +139,12 @@ static inline int iommufd_access_rw(struct iommufd_access *access, unsigned long return -EOPNOTSUPP; }
+static inline struct device * +iommufd_vdev_id_to_dev(struct iommufd_vdev_id *vdev_id) +{ + return NULL; +} + static inline int iommufd_vfio_compat_ioas_create(struct iommufd_ctx *ictx) { return -EOPNOTSUPP;