cxl_calculate_position
EXPORT_SYMBOL_FOR_MODULES(cxl_calculate_position, "cxl_translate");
pos = cxl_calculate_position(hpa_offset, eiw, eig);
int cxl_calculate_position(u64 hpa_offset, u8 eiw, u16 eig);
return cxl_calculate_position(offset, r_eiw, r_eig);
reverse_pos = cxl_calculate_position(hpa, eiw, eig);