On Fri, Nov 17, 2023 at 05:07:13AM -0800, Yi Liu wrote: > +/** > + * struct iommu_hwpt_invalidate - ioctl(IOMMU_HWPT_INVALIDATE) > + * @size: sizeof(struct iommu_hwpt_invalidate) > + * @hwpt_id: HWPT ID of a nested HWPT for cache invalidation > + * @reqs_uptr: User pointer to an array having @req_num of cache invalidation > + * requests. The request entries in the array are of fixed width > + * @req_len, and contain a user data structure for invalidation > + * request specific to the given hardware page table. > + * @req_type: One of enum iommu_hwpt_data_type, defining the data type of all > + * the entries in the invalidation request array. It should suit > + * with the data_type passed per the allocation of the hwpt pointed > + * by @hwpt_id. > + * @req_len: Length (in bytes) of a request entry in the request array > + * @req_num: Input the number of cache invalidation requests in the array. > + * Output the number of requests successfully handled by kernel. > + * @out_driver_error_code: Report a driver speicifc error code upon failure. > + * It's optional, driver has a choice to fill it or > + * not. "specific" Jason
