linux-kernel - Re: [RFC v1 8/8] iommu: expose the function iommu_device_use_default

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Message-ID: <CACGkMEuA3jg06s9wuxTL60geFm6+nnbEnYXvv8HhTgXoFHyJgQ@mail.gmail.com>
Date:   Wed, 8 Nov 2023 11:03:48 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Cindy Lu <lulu@...hat.com>
Cc:     mst@...hat.com, yi.l.liu@...el.com, jgg@...dia.com,
        linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org
Subject: Re: [RFC v1 8/8] iommu: expose the function iommu_device_use_default_domain

On Tue, Nov 7, 2023 at 2:10 PM Cindy Lu <lulu@...hat.com> wrote:
>
> On Mon, Nov 6, 2023 at 3:26 PM Jason Wang <jasowang@...hat.com> wrote:
> >
> > On Sat, Nov 4, 2023 at 1:18 AM Cindy Lu <lulu@...hat.com> wrote:
> > >
> > > Expose the function iommu_device_use_default_domain() and
> > > iommu_device_unuse_default_domain()，
> > > While vdpa bind the iommufd device and detach the iommu device,
> > > vdpa need to call the function
> > > iommu_device_unuse_default_domain() to release the owner
> > >
> > > Signed-off-by: Cindy Lu <lulu@...hat.com>
> >
> > This is the end of the series, who is the user then?
> >
> > Thanks
> >
> hi Jason
> These 2 functions was called in vhost_vdpa_iommufd_set_device(), Vdpa need to
> release the dma owner, otherwise, the function will fail when
> iommufd called iommu_device_claim_dma_owner() in iommufd_device_bind()
> I will change this sequence, Or maybe will find some other way to fix
> this problem
> thanks

I meant exporting helpers needs to be done before the real users.

Thanks

> cindy
>
>
> > > ---
> > >  drivers/iommu/iommu.c | 2 ++
> > >  1 file changed, 2 insertions(+)
> > >
> > > diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
> > > index 3bfc56df4f78..987cbf8c9a87 100644
> > > --- a/drivers/iommu/iommu.c
> > > +++ b/drivers/iommu/iommu.c
> > > @@ -3164,6 +3164,7 @@ int iommu_device_use_default_domain(struct device *dev)
> > >
> > >         return ret;
> > >  }
> > > +EXPORT_SYMBOL_GPL(iommu_device_use_default_domain);
> > >
> > >  /**
> > >   * iommu_device_unuse_default_domain() - Device driver stops handling device
> > > @@ -3187,6 +3188,7 @@ void iommu_device_unuse_default_domain(struct device *dev)
> > >         mutex_unlock(&group->mutex);
> > >         iommu_group_put(group);
> > >  }
> > > +EXPORT_SYMBOL_GPL(iommu_device_unuse_default_domain);
> > >
> > >  static int __iommu_group_alloc_blocking_domain(struct iommu_group *group)
> > >  {
> > > --
> > > 2.34.3
> > >
> >
>