Re: [PATCH v6 3/6] iommu: Add iommu_copy_struct_from_user_array helper

On 11/17/2023 9:07 PM, Yi Liu wrote:

+/**

• • iommu_copy_struct_from_user_array - Copy iommu driver specific user space

• •                                 data from an iommu_user_data_array
    

• • @kdst: Pointer to an iommu driver specific user data that is defined in

• •    include/uapi/linux/iommufd.h
    

• • @user_array: Pointer to a struct iommu_user_data_array for a user space array
• • @data_type: The data type of the @kdst. Must match with @user_array->type
• • @index: Index to offset the location in the array to copy user data from
• • @min_last: The last memember of the data structure @kdst points in the

s/memember/member/

• •        initial version.
    

• • Return 0 for success, otherwise -error.
• */

+#define iommu_copy_struct_from_user_array(kdst, user_array, data_type, \

• 			  index, min_last)               \
  

• __iommu_copy_struct_from_user_array(kdst, user_array, data_type, \

• 			    index, sizeof(*kdst),        \
  

• 			    offsetofend(typeof(*kdst),   \
  

• 					min_last))
  

• /**
  • struct iommu_ops - iommu ops and capabilities
  • @capable: check capability