On 5/2/2025 4:31 AM, Nicolin Chen wrote:
The new type of vIOMMU for tegra241-cmdqv driver needs a driver-specific user data. So, add data_len/uptr to the iommu_viommu_alloc uAPI and pass it in via the viommu_alloc iommu op.
Reviewed-by: Vasant Hegde vasant.hegde@amd.com
-Vasant
Reviewed-by: Jason Gunthorpe jgg@nvidia.com Reviewed-by: Lu Baolu baolu.lu@linux.intel.com Acked-by: Pranjal Shrivastava praan@google.com Acked-by: Alok Tiwari alok.a.tiwari@oracle.com Signed-off-by: Nicolin Chen nicolinc@nvidia.com
include/uapi/linux/iommufd.h | 6 ++++++ drivers/iommu/iommufd/viommu.c | 8 +++++++- 2 files changed, 13 insertions(+), 1 deletion(-)
diff --git a/include/uapi/linux/iommufd.h b/include/uapi/linux/iommufd.h index f29b6c44655e..cc90299a08d9 100644 --- a/include/uapi/linux/iommufd.h +++ b/include/uapi/linux/iommufd.h @@ -965,6 +965,9 @@ enum iommu_viommu_type {
- @dev_id: The device's physical IOMMU will be used to back the virtual IOMMU
- @hwpt_id: ID of a nesting parent HWPT to associate to
- @out_viommu_id: Output virtual IOMMU ID for the allocated object
- @data_len: Length of the type specific data
- @__reserved: Must be 0
- @data_uptr: User pointer to an array of driver-specific virtual IOMMU data
- Allocate a virtual IOMMU object, representing the underlying physical IOMMU's
- virtualization support that is a security-isolated slice of the real IOMMU HW
@@ -985,6 +988,9 @@ struct iommu_viommu_alloc { __u32 dev_id; __u32 hwpt_id; __u32 out_viommu_id;
- __u32 data_len;
- __u32 __reserved;
- __aligned_u64 data_uptr;
}; #define IOMMU_VIOMMU_ALLOC _IO(IOMMUFD_TYPE, IOMMUFD_CMD_VIOMMU_ALLOC) diff --git a/drivers/iommu/iommufd/viommu.c b/drivers/iommu/iommufd/viommu.c index fffa57063c60..a65153458a26 100644 --- a/drivers/iommu/iommufd/viommu.c +++ b/drivers/iommu/iommufd/viommu.c @@ -17,6 +17,11 @@ void iommufd_viommu_destroy(struct iommufd_object *obj) int iommufd_viommu_alloc_ioctl(struct iommufd_ucmd *ucmd) { struct iommu_viommu_alloc *cmd = ucmd->cmd;
- const struct iommu_user_data user_data = {
.type = cmd->type,.uptr = u64_to_user_ptr(cmd->data_uptr),.len = cmd->data_len,- }; struct iommufd_hwpt_paging *hwpt_paging; struct iommufd_viommu *viommu; struct iommufd_device *idev;
@@ -48,7 +53,8 @@ int iommufd_viommu_alloc_ioctl(struct iommufd_ucmd *ucmd) } viommu = ops->viommu_alloc(idev->dev, hwpt_paging->common.domain,
ucmd->ictx, cmd->type, NULL);
ucmd->ictx, cmd->type,user_data.len ? &user_data : NULL);