From c3436d42f812faffac94f8fb3fb246ab43ffdffe Mon Sep 17 00:00:00 2001 From: Nicolin Chen Date: Wed, 9 Jul 2025 22:58:58 -0700 Subject: iommu: Pass in a driver-level user data structure to viommu_init op The new type of vIOMMU for tegra241-cmdqv allows user space VM to use one of its virtual command queue HW resources exclusively. This requires user space to mmap the corresponding MMIO page from kernel space for direct HW control. To forward the mmap info (offset and length), iommufd should add a driver specific data structure to the IOMMUFD_CMD_VIOMMU_ALLOC ioctl, for driver to output the info during the vIOMMU initialization back to user space. Similar to the existing ioctls and their IOMMU handlers, add a user_data to viommu_init op to bridge between iommufd and drivers. Link: https://patch.msgid.link/r/90bd5637dab7f5507c7a64d2c4826e70431e45a4.1752126748.git.nicolinc@nvidia.com Reviewed-by: Jason Gunthorpe Reviewed-by: Lu Baolu Reviewed-by: Pranjal Shrivastava Reviewed-by: Kevin Tian Reviewed-by: Vasant Hegde Signed-off-by: Nicolin Chen Signed-off-by: Jason Gunthorpe --- include/linux/iommu.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'include') diff --git a/include/linux/iommu.h b/include/linux/iommu.h index fd7319706684..e06a0fbe4bc7 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -700,7 +700,8 @@ struct iommu_ops { size_t (*get_viommu_size)(struct device *dev, enum iommu_viommu_type viommu_type); int (*viommu_init)(struct iommufd_viommu *viommu, - struct iommu_domain *parent_domain); + struct iommu_domain *parent_domain, + const struct iommu_user_data *user_data); const struct iommu_domain_ops *default_domain_ops; unsigned long pgsize_bitmap; -- cgit v1.2.3