Re: [PATCH v1 2/4] iommu: Add iommu_default_domain_free helper

[Nicolin Chen <nicolinc@nvidia.com>]

On Thu, Feb 27, 2025 at 05:03:36PM -0400, Jason Gunthorpe wrote:
> On Thu, Feb 27, 2025 at 12:59:04PM -0800, Nicolin Chen wrote:
> > On Thu, Feb 27, 2025 at 03:50:36PM -0400, Jason Gunthorpe wrote:
> > > On Wed, Feb 26, 2025 at 12:16:05PM -0800, Nicolin Chen wrote:
> > > > The iommu_put_dma_cookie() will be moved out of iommu_domain_free(). For a
> > > > default domain, iommu_put_dma_cookie() can be simply added to this helper.
> > > > 
> > > > Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
> > > > Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
> > > > ---
> > > >  drivers/iommu/iommu.c | 11 ++++++++---
> > > >  1 file changed, 8 insertions(+), 3 deletions(-)
> > > 
> > > Let's try to do what Robin suggested and put a private_data_owner
> > > value in the struct then this patch isn't used, we'd just do
> > > 
> > >       if (domain->private_data_owner == DMA)
> > > 	iommu_put_dma_cookie(domain);
> > > 
> > > Instead of this change and the similar VFIO change
> > 
> > Ack. I assume I should go with a smaller series starting with this
> > "private_data_owner", and then later a bigger series for the other
> > bits like translation_type that you mentioned in the other thread.
> 
> That could work, you could bitfiled type and steal a few bits for
> "private_data_owner" ?
> 
> Then try the sw_msi removal at the same time too?

Ack. I drafted four patches:
  iommu: Add private_data_owner to iommu_domain_free
  iommu: Turn iova_cookie to dma-iommu private pointer
  iommufd: Move iommufd_sw_msi and related functions to driver.c
  iommu: Drop sw_msi from iommu_domain

Will do some proper build tests and then wrap them up.

Thanks
Nicolin