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

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Message-ID: <CACLfguUPZVY2HDBoir67u0CeR3A9wHjCGvuc3cGLe0L43f8jkg@mail.gmail.com>
Date:   Tue, 7 Nov 2023 14:10:11 +0800
From:   Cindy Lu <lulu@...hat.com>
To:     Jason Wang <jasowang@...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 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
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
> >
>