diff options
Diffstat (limited to 'include/linux/iommu.h')
| -rw-r--r-- | include/linux/iommu.h | 27 |
1 files changed, 24 insertions, 3 deletions
diff --git a/include/linux/iommu.h b/include/linux/iommu.h index bc303cb2af37..2ddd99f55471 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -266,6 +266,21 @@ struct iommu_dirty_ops { }; /** + * struct iommu_user_data - iommu driver specific user space data info + * @type: The data type of the user buffer + * @uptr: Pointer to the user buffer for copy_from_user() + * @len: The length of the user buffer in bytes + * + * A user space data is an uAPI that is defined in include/uapi/linux/iommufd.h + * @type, @uptr and @len should be just copied from an iommufd core uAPI struct. + */ +struct iommu_user_data { + unsigned int type; + void __user *uptr; + size_t len; +}; + +/** * struct iommu_ops - iommu ops and capabilities * @capable: check capability * @hw_info: report iommu hardware information. The data buffer returned by this @@ -279,8 +294,12 @@ struct iommu_dirty_ops { * parameters as defined in include/uapi/linux/iommufd.h. * Unlike @domain_alloc, it is called only by IOMMUFD and * must fully initialize the new domain before return. - * Upon success, a domain is returned. Upon failure, - * ERR_PTR must be returned. + * Upon success, if the @user_data is valid and the @parent + * points to a kernel-managed domain, the new domain must be + * IOMMU_DOMAIN_NESTED type; otherwise, the @parent must be + * NULL while the @user_data can be optionally provided, the + * new domain must support __IOMMU_DOMAIN_PAGING. + * Upon failure, ERR_PTR must be returned. * @probe_device: Add device to iommu driver handling * @release_device: Remove device from iommu driver handling * @probe_finalize: Do final setup work after the device is added to an IOMMU @@ -313,7 +332,9 @@ struct iommu_ops { /* Domain allocation and freeing by the iommu driver */ struct iommu_domain *(*domain_alloc)(unsigned iommu_domain_type); - struct iommu_domain *(*domain_alloc_user)(struct device *dev, u32 flags); + struct iommu_domain *(*domain_alloc_user)( + struct device *dev, u32 flags, struct iommu_domain *parent, + const struct iommu_user_data *user_data); struct iommu_device *(*probe_device)(struct device *dev); void (*release_device)(struct device *dev); |