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[v5,05/13] iommufd: Add alloc_domain_nested op to iommufd_viommu_ops

Message ID fa5231cad2bf4b3ee9a18434a8981acb45f0e0b5.1729897352.git.nicolinc@nvidia.com
State Superseded
Headers show
Series iommufd: Add vIOMMU infrastructure (Part-1) | expand

Commit Message

Nicolin Chen Oct. 25, 2024, 11:49 p.m. UTC 
Allow IOMMU driver to use a vIOMMU object that holds a nesting parent
hwpt/domain to allocate a nested domain.

Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
---
 include/linux/iommufd.h | 9 +++++++++
 1 file changed, 9 insertions(+)
diff mbox series

Patch

diff --git a/include/linux/iommufd.h b/include/linux/iommufd.h
index 4435f21bd833..083ceb209704 100644
--- a/include/linux/iommufd.h
+++ b/include/linux/iommufd.h
@@ -14,6 +14,7 @@ 
 struct device;
 struct file;
 struct iommu_group;
+struct iommu_user_data;
 struct iommufd_access;
 struct iommufd_ctx;
 struct iommufd_device;
@@ -95,9 +96,17 @@  struct iommufd_viommu {
  * struct iommufd_viommu_ops - vIOMMU specific operations
  * @free: Free all driver-specific parts of an iommufd_viommu. The memory of the
  *        vIOMMU will be free-ed by iommufd core after calling this free op.
+ * @alloc_domain_nested: Allocate a IOMMU_DOMAIN_NESTED on a vIOMMU that holds a
+ *                       nesting parent domain (IOMMU_DOMAIN_PAGING). @user_data
+ *                       must be defined in include/uapi/linux/iommufd.h.
+ *                       It must fully initialize the new iommu_domain before
+ *                       returning. Upon failure, ERR_PTR must be returned.
  */
 struct iommufd_viommu_ops {
 	void (*free)(struct iommufd_viommu *viommu);
+	struct iommu_domain *(*alloc_domain_nested)(
+		struct iommufd_viommu *viommu,
+		const struct iommu_user_data *user_data);
 };
 
 #if IS_ENABLED(CONFIG_IOMMUFD)