Hi Christian,

On Tue, 31 Mar 2020, 14:16 Daniel Vetter, <daniel@ffwll.ch> wrote:

> On Mon, Mar 30, 2020 at 03:55:31PM +0200, Christian König wrote:
> > Add a peer2peer flag noting that the importer can deal with device
> > resources which are not backed by pages.
> >
> > Signed-off-by: Christian König <christian.koenig@amd.com>
>
> On the series:
>
> Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
>
Fwiw, for the series,
Acked-by: Sumit Semwal <sumit.semwal@linaro.org>

> ---
> >  drivers/dma-buf/dma-buf.c |  2 ++
> >  include/linux/dma-buf.h   | 10 ++++++++++
> >  2 files changed, 12 insertions(+)
> >
> > diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
> > index ccc9eda1bc28..570c923023e6 100644
> > --- a/drivers/dma-buf/dma-buf.c
> > +++ b/drivers/dma-buf/dma-buf.c
> > @@ -690,6 +690,8 @@ dma_buf_dynamic_attach(struct dma_buf *dmabuf,
> struct device *dev,
> >
> >       attach->dev = dev;
> >       attach->dmabuf = dmabuf;
> > +     if (importer_ops)
> > +             attach->peer2peer = importer_ops->allow_peer2peer;
> >       attach->importer_ops = importer_ops;
> >       attach->importer_priv = importer_priv;
> >
> > diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h
> > index 1ade486fc2bb..82e0a4a64601 100644
> > --- a/include/linux/dma-buf.h
> > +++ b/include/linux/dma-buf.h
> > @@ -334,6 +334,14 @@ struct dma_buf {
> >   * Attachment operations implemented by the importer.
> >   */
> >  struct dma_buf_attach_ops {
> > +     /**
> > +      * @allow_peer2peer:
> > +      *
> > +      * If this is set to true the importer must be able to handle peer
> > +      * resources without struct pages.
> > +      */
> > +     bool allow_peer2peer;
> > +
> >       /**
> >        * @move_notify
> >        *
> > @@ -362,6 +370,7 @@ struct dma_buf_attach_ops {
> >   * @node: list of dma_buf_attachment, protected by dma_resv lock of the
> dmabuf.
> >   * @sgt: cached mapping.
> >   * @dir: direction of cached mapping.
> > + * @peer2peer: true if the importer can handle peer resources without
> pages.
> >   * @priv: exporter specific attachment data.
> >   * @importer_ops: importer operations for this attachment, if provided
> >   * dma_buf_map/unmap_attachment() must be called with the dma_resv lock
> held.
> > @@ -382,6 +391,7 @@ struct dma_buf_attachment {
> >       struct list_head node;
> >       struct sg_table *sgt;
> >       enum dma_data_direction dir;
> > +     bool peer2peer;
> >       const struct dma_buf_attach_ops *importer_ops;
> >       void *importer_priv;
> >       void *priv;
> > --
> > 2.17.1
> >
>
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch
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