[PATCH v2 04/22] iommu: Add iommu_copy_struct_to_user helper

[Nicolin Chen]

On Mon, Apr 28, 2025 at 05:50:28PM +0000, Pranjal Shrivastava wrote:
> On Fri, Apr 25, 2025 at 10:57:59PM -0700, Nicolin Chen wrote:
> > Similar to the iommu_copy_struct_from_user helper receiving data from the
> > user space, add an iommu_copy_struct_to_user helper to report output data
> > back to the user space data pointer.
> > 
> > Reviewed-by: Jason Gunthorpe <jgg at nvidia.com>
> > Signed-off-by: Nicolin Chen <nicolinc at nvidia.com>
> > ---
> >  include/linux/iommu.h | 40 ++++++++++++++++++++++++++++++++++++++++
> >  1 file changed, 40 insertions(+)
> > 
> > diff --git a/include/linux/iommu.h b/include/linux/iommu.h
> > index ba7add27e9a0..634ff647888d 100644
> > --- a/include/linux/iommu.h
> > +++ b/include/linux/iommu.h
> > @@ -562,6 +562,46 @@ iommu_copy_struct_from_full_user_array(void *kdst, size_t kdst_entry_size,
> >  	return 0;
> >  }
> >  
> > +/**
> > + * __iommu_copy_struct_to_user - Report iommu driver specific user space data
> > + * @dst_data: Pointer to a struct iommu_user_data for user space data location
> > + * @src_data: Pointer to an iommu driver specific user data that is defined in
> > + *            include/uapi/linux/iommufd.h
> > + * @data_type: The data type of the @dst_data. Must match with @src_data.type
> 								   ^
> Nit: Must match with @dst_data type.

Oh, that's a copy-n-paste mistake. It should be:
  * @data_type: The data type of the @src_data. Must match with @dst_data.type

Thanks!
Nicolin