Re: [Intel-gfx] [PATCH 1/6] dma-buf: add dynamic DMA-buf handling v12

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On Tue, Jun 25, 2019 at 4:45 PM Christian König
<ckoenig.leichtzumerken@xxxxxxxxx> wrote:
>
> Am 25.06.19 um 16:35 schrieb Daniel Vetter:
> > Hi Christian,
> >
> > On Tue, Jun 25, 2019 at 02:46:49PM +0200, Christian König wrote:
> >> On the exporter side we add optional explicit pinning callbacks. If those
> >> callbacks are implemented the framework no longer caches sg tables and the
> >> map/unmap callbacks are always called with the lock of the reservation object
> >> held.
> >>
> >> On the importer side we add an optional invalidate callback. This callback is
> >> used by the exporter to inform the importers that their mappings should be
> >> destroyed as soon as possible.
> >>
> >> This allows the exporter to provide the mappings without the need to pin
> >> the backing store.
> >>
> >> v2: don't try to invalidate mappings when the callback is NULL,
> >>      lock the reservation obj while using the attachments,
> >>      add helper to set the callback
> >> v3: move flag for invalidation support into the DMA-buf,
> >>      use new attach_info structure to set the callback
> >> v4: use importer_priv field instead of mangling exporter priv.
> >> v5: drop invalidation_supported flag
> >> v6: squash together with pin/unpin changes
> >> v7: pin/unpin takes an attachment now
> >> v8: nuke dma_buf_attachment_(map|unmap)_locked,
> >>      everything is now handled backward compatible
> >> v9: always cache when export/importer don't agree on dynamic handling
> >> v10: minimal style cleanup
> >> v11: drop automatically re-entry avoidance
> >> v12: rename callback to move_notify
> >>
> >> Signed-off-by: Christian König <christian.koenig@xxxxxxx>
> >> ---
> >>   drivers/dma-buf/dma-buf.c | 179 ++++++++++++++++++++++++++++++++++++--
> >>   include/linux/dma-buf.h   | 108 +++++++++++++++++++++--
> >>   2 files changed, 273 insertions(+), 14 deletions(-)
> >>
> >> diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
> >> index 6c15deb5d4ad..216f76109f3f 100644
> >> --- a/drivers/dma-buf/dma-buf.c
> >> +++ b/drivers/dma-buf/dma-buf.c
> >> @@ -531,6 +531,9 @@ struct dma_buf *dma_buf_export(const struct dma_buf_export_info *exp_info)
> >>              return ERR_PTR(-EINVAL);
> >>      }
> >>
> >> +    if (WARN_ON(exp_info->ops->cache_sgt_mapping && exp_info->ops->pin))
> >> +            return ERR_PTR(-EINVAL);
> >> +
> >>      if (!try_module_get(exp_info->owner))
> >>              return ERR_PTR(-ENOENT);
> >>
> >> @@ -651,10 +654,12 @@ void dma_buf_put(struct dma_buf *dmabuf)
> >>   EXPORT_SYMBOL_GPL(dma_buf_put);
> >>
> >>   /**
> >> - * dma_buf_attach - Add the device to dma_buf's attachments list; optionally,
> >> + * dma_buf_dynamic_attach - Add the device to dma_buf's attachments list; optionally,
> >>    * calls attach() of dma_buf_ops to allow device-specific attach functionality
> >> - * @dmabuf: [in]    buffer to attach device to.
> >> - * @dev:    [in]    device to be attached.
> >> + * @dmabuf:         [in]    buffer to attach device to.
> >> + * @dev:            [in]    device to be attached.
> >> + * @importer_ops    [in]    importer operations for the attachment
> >> + * @importer_priv   [in]    importer private pointer for the attachment
> >>    *
> >>    * Returns struct dma_buf_attachment pointer for this attachment. Attachments
> >>    * must be cleaned up by calling dma_buf_detach().
> >> @@ -668,8 +673,10 @@ EXPORT_SYMBOL_GPL(dma_buf_put);
> >>    * accessible to @dev, and cannot be moved to a more suitable place. This is
> >>    * indicated with the error code -EBUSY.
> >>    */
> >> -struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf,
> >> -                                      struct device *dev)
> >> +struct dma_buf_attachment *
> >> +dma_buf_dynamic_attach(struct dma_buf *dmabuf, struct device *dev,
> >> +                   const struct dma_buf_attach_ops *importer_ops,
> >> +                   void *importer_priv)
> >>   {
> >>      struct dma_buf_attachment *attach;
> >>      int ret;
> >> @@ -683,6 +690,8 @@ struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf,
> >>
> >>      attach->dev = dev;
> >>      attach->dmabuf = dmabuf;
> >> +    attach->importer_ops = importer_ops;
> >> +    attach->importer_priv = importer_priv;
> >>
> >>      mutex_lock(&dmabuf->lock);
> >>
> >> @@ -691,16 +700,72 @@ struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf,
> >>              if (ret)
> >>                      goto err_attach;
> >>      }
> >> +    reservation_object_lock(dmabuf->resv, NULL);
> >>      list_add(&attach->node, &dmabuf->attachments);
> >> +    reservation_object_unlock(dmabuf->resv);
> >>
> >>      mutex_unlock(&dmabuf->lock);
> >>
> >> +    /* When either the importer or the exporter can't handle dynamic
> >> +     * mappings we cache the mapping here to avoid issues with the
> >> +     * reservation object lock.
> >> +     */
> >> +    if (dma_buf_attachment_is_dynamic(attach) !=
> >> +        dma_buf_is_dynamic(dmabuf)) {
> >> +            struct sg_table *sgt;
> >> +
> >> +            if (dma_buf_is_dynamic(attach->dmabuf)) {
> >> +                    reservation_object_lock(attach->dmabuf->resv, NULL);
> >> +                    ret = dma_buf_pin(attach);
> >> +                    if (ret)
> >> +                            goto err_unlock;
> >> +            }
> >> +
> >> +            sgt = dmabuf->ops->map_dma_buf(attach, DMA_BIDIRECTIONAL);
> >> +            if (!sgt)
> >> +                    sgt = ERR_PTR(-ENOMEM);
> >> +            if (IS_ERR(sgt)) {
> >> +                    ret = PTR_ERR(sgt);
> >> +                    goto err_unpin;
> >> +            }
> >> +            if (dma_buf_is_dynamic(attach->dmabuf))
> >> +                    reservation_object_unlock(attach->dmabuf->resv);
> >> +            attach->sgt = sgt;
> >> +            attach->dir = DMA_BIDIRECTIONAL;
> >> +    }
> >> +
> >>      return attach;
> >>
> >>   err_attach:
> >>      kfree(attach);
> >>      mutex_unlock(&dmabuf->lock);
> >>      return ERR_PTR(ret);
> >> +
> >> +err_unpin:
> >> +    if (dma_buf_is_dynamic(attach->dmabuf))
> >> +            dma_buf_unpin(attach);
> >> +
> >> +err_unlock:
> >> +    if (dma_buf_is_dynamic(attach->dmabuf))
> >> +            reservation_object_unlock(attach->dmabuf->resv);
> >> +
> >> +    dma_buf_detach(dmabuf, attach);
> >> +    return ERR_PTR(ret);
> >> +}
> >> +EXPORT_SYMBOL_GPL(dma_buf_dynamic_attach);
> >> +
> >> +/**
> >> + * dma_buf_attach - Wrapper for dma_buf_dynamic_attach
> >> + * @dmabuf: [in]    buffer to attach device to.
> >> + * @dev:    [in]    device to be attached.
> >> + *
> >> + * Wrapper to call dma_buf_dynamic_attach() for drivers which still use a static
> >> + * mapping.
> >> + */
> >> +struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf,
> >> +                                      struct device *dev)
> >> +{
> >> +    return dma_buf_dynamic_attach(dmabuf, dev, NULL, NULL);
> >>   }
> >>   EXPORT_SYMBOL_GPL(dma_buf_attach);
> >>
> >> @@ -717,11 +782,22 @@ void dma_buf_detach(struct dma_buf *dmabuf, struct dma_buf_attachment *attach)
> >>      if (WARN_ON(!dmabuf || !attach))
> >>              return;
> >>
> >> -    if (attach->sgt)
> >> +    if (attach->sgt) {
> >> +            if (dma_buf_is_dynamic(attach->dmabuf))
> >> +                    reservation_object_lock(attach->dmabuf->resv, NULL);
> >> +
> >>              dmabuf->ops->unmap_dma_buf(attach, attach->sgt, attach->dir);
> >>
> >> +            if (dma_buf_is_dynamic(attach->dmabuf)) {
> >> +                    dma_buf_unpin(attach);
> >> +                    reservation_object_unlock(attach->dmabuf->resv);
> >> +            }
> >> +    }
> >> +
> >>      mutex_lock(&dmabuf->lock);
> > Time to ditch dmabuf->lock in favour of the reservation obj? We have a
> > fallback resv_obj in struct dma_buf already, so this is never null, and I
> > think would clean up the code a bit.
>
> Yeah, thought about that as well. But then decided against it for now.
>
> Key point is that exporters currently doesn't care about dmabuf->lock,
> but they do care about the reservation lock.
>
> So we will probably have a bunch of cases where we have to fix up
> exporters because they will try to grab the reservation lock as well.
>
> On the other hand we maybe not need a lock at all here if we just can
> live with multiple attach/detach callbacks running in parallel.

Well looking through the code I thought that all the places you grab
dmabuf->resv we also grab dmabuf->lock, so seemed fully redundant. But
I didn't check completely.

>
> >
> >
> >> +    reservation_object_lock(dmabuf->resv, NULL);
> >>      list_del(&attach->node);
> >> +    reservation_object_unlock(dmabuf->resv);
> >>      if (dmabuf->ops->detach)
> >>              dmabuf->ops->detach(dmabuf, attach);
> >>
> >> @@ -730,6 +806,44 @@ void dma_buf_detach(struct dma_buf *dmabuf, struct dma_buf_attachment *attach)
> >>   }
> >>   EXPORT_SYMBOL_GPL(dma_buf_detach);
> >>
> >> +/**
> >> + * dma_buf_pin - Lock down the DMA-buf
> >> + *
> >> + * @attach: [in]    attachment which should be pinned
> >> + *
> >> + * Returns:
> >> + * 0 on success, negative error code on failure.
> >> + */
> >> +int dma_buf_pin(struct dma_buf_attachment *attach)
> >> +{
> >> +    struct dma_buf *dmabuf = attach->dmabuf;
> >> +    int ret = 0;
> >> +
> >> +    reservation_object_assert_held(dmabuf->resv);
> >> +
> >> +    if (dmabuf->ops->pin)
> >> +            ret = dmabuf->ops->pin(attach);
> >> +
> >> +    return ret;
> >> +}
> >> +EXPORT_SYMBOL_GPL(dma_buf_pin);
> >> +
> >> +/**
> >> + * dma_buf_unpin - Remove lock from DMA-buf
> >> + *
> >> + * @attach: [in]    attachment which should be unpinned
> >> + */
> >> +void dma_buf_unpin(struct dma_buf_attachment *attach)
> >> +{
> >> +    struct dma_buf *dmabuf = attach->dmabuf;
> >> +
> >> +    reservation_object_assert_held(dmabuf->resv);
> >> +
> >> +    if (dmabuf->ops->unpin)
> >> +            dmabuf->ops->unpin(attach);
> >> +}
> >> +EXPORT_SYMBOL_GPL(dma_buf_unpin);
> >> +
> >>   /**
> >>    * dma_buf_map_attachment - Returns the scatterlist table of the attachment;
> >>    * mapped into _device_ address space. Is a wrapper for map_dma_buf() of the
> >> @@ -749,6 +863,7 @@ struct sg_table *dma_buf_map_attachment(struct dma_buf_attachment *attach,
> >>                                      enum dma_data_direction direction)
> >>   {
> >>      struct sg_table *sg_table;
> >> +    int r;
> >>
> >>      might_sleep();
> >>
> >> @@ -767,10 +882,29 @@ struct sg_table *dma_buf_map_attachment(struct dma_buf_attachment *attach,
> >>              return attach->sgt;
> >>      }
> >>
> >> +    if (dma_buf_attachment_is_dynamic(attach)) {
> >> +            reservation_object_assert_held(attach->dmabuf->resv);
> >> +
> >> +    } else if (dma_buf_is_dynamic(attach->dmabuf)) {
> >> +            reservation_object_lock(attach->dmabuf->resv, NULL);
> >> +            r = dma_buf_pin(attach);
> >> +            if (r) {
> >> +                    reservation_object_unlock(attach->dmabuf->resv);
> >> +                    return ERR_PTR(r);
> >> +            }
> >> +    }
> > With this design (because we can't cache at attach time unconditionally)
> > we inflict the reservation lock on all importers. So needs:
> >
> >       } else {
> >               /* neither importer nor exporter are dynamice */
> >               might_lock(dmabuf->resv->ww_mutex);
> >       }
> >
> > Same for dma_buf_unmap_attachment.
>
> Good idea.
>
> >
> > I also expect that this will blow up in intel-gfx-ci :-/ I did look at
> > previous intel-gfx-ci runs of your series, and the last one that did pass
> > was the one that still had the caching in _attach():
>
> Well as far as I can see the current one passes as well. Actually just
> recently found a typo because of this.

Hm indeed the amd/i915 prime tests are still in BAT and that passed.
I'm surprised. Maybe Chris Wilson moved along quite a lot with our
locking rework and i915 isn't the bad one out anymore.

> > Geez I was sooooooooo locking forward to slapping an r-b on this and
> > volunteering myself to polish the kerneldoc (which isn't great, but also
> > pre-existing condition plus on my todo list anyway) :-(
>
> Going to add the might_lock and send again, let's see what intel-gfx-ci
> has say to this.

Yeah that should at least increase the chances we're seeing something.
Ofc intel-gfx-ci doesn't test everything :-)
-Daniel

>
> Christian.
>
> >
> >> +
> >>      sg_table = attach->dmabuf->ops->map_dma_buf(attach, direction);
> >>      if (!sg_table)
> >>              sg_table = ERR_PTR(-ENOMEM);
> >>
> >> +    if (!dma_buf_attachment_is_dynamic(attach) &&
> >> +        dma_buf_is_dynamic(attach->dmabuf)) {
> >> +            if (IS_ERR(sg_table))
> >> +                    dma_buf_unpin(attach);
> >> +            reservation_object_unlock(attach->dmabuf->resv);
> >> +    }
> >> +
> >>      if (!IS_ERR(sg_table) && attach->dmabuf->ops->cache_sgt_mapping) {
> >>              attach->sgt = sg_table;
> >>              attach->dir = direction;
> >> @@ -802,10 +936,41 @@ void dma_buf_unmap_attachment(struct dma_buf_attachment *attach,
> >>      if (attach->sgt == sg_table)
> >>              return;
> >>
> >> +    if (dma_buf_attachment_is_dynamic(attach))
> >> +            reservation_object_assert_held(attach->dmabuf->resv);
> >> +    else if (dma_buf_is_dynamic(attach->dmabuf))
> >> +            reservation_object_lock(attach->dmabuf->resv, NULL);
> >> +
> >>      attach->dmabuf->ops->unmap_dma_buf(attach, sg_table, direction);
> >> +
> >> +    if (dma_buf_is_dynamic(attach->dmabuf) &&
> >> +        !dma_buf_attachment_is_dynamic(attach)) {
> >> +            dma_buf_unpin(attach);
> >> +            reservation_object_unlock(attach->dmabuf->resv);
> >> +    }
> >>   }
> >>   EXPORT_SYMBOL_GPL(dma_buf_unmap_attachment);
> >>
> >> +/**
> >> + * dma_buf_move_notify - notify attachments that DMA-buf is moving
> >> + *
> >> + * @dmabuf: [in]    buffer which is moving
> >> + *
> >> + * Informs all attachmenst that they need to destroy and recreated all their
> >> + * mappings.
> >> + */
> >> +void dma_buf_move_notify(struct dma_buf *dmabuf)
> >> +{
> >> +    struct dma_buf_attachment *attach;
> >> +
> >> +    reservation_object_assert_held(dmabuf->resv);
> >> +
> >> +    list_for_each_entry(attach, &dmabuf->attachments, node)
> >> +            if (attach->importer_ops && attach->importer_ops->move_notify)
> >> +                    attach->importer_ops->move_notify(attach);
> >> +}
> >> +EXPORT_SYMBOL_GPL(dma_buf_move_notify);
> >> +
> >>   /**
> >>    * DOC: cpu access
> >>    *
> >> @@ -1225,10 +1390,12 @@ static int dma_buf_debug_show(struct seq_file *s, void *unused)
> >>              seq_puts(s, "\tAttached Devices:\n");
> >>              attach_count = 0;
> >>
> >> +            reservation_object_lock(buf_obj->resv, NULL);
> >>              list_for_each_entry(attach_obj, &buf_obj->attachments, node) {
> >>                      seq_printf(s, "\t%s\n", dev_name(attach_obj->dev));
> >>                      attach_count++;
> >>              }
> >> +            reservation_object_unlock(buf_obj->resv);
> > Yeah definitely time to retire dmabuf->lock I think.
> >
> > Cheers, Daniel
> >
> >>
> >>              seq_printf(s, "Total %d devices attached\n\n",
> >>                              attach_count);
> >> diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h
> >> index 01ad5b942a6f..ccad2fc1f640 100644
> >> --- a/include/linux/dma-buf.h
> >> +++ b/include/linux/dma-buf.h
> >> @@ -92,14 +92,40 @@ struct dma_buf_ops {
> >>       */
> >>      void (*detach)(struct dma_buf *, struct dma_buf_attachment *);
> >>
> >> +    /**
> >> +     * @pin:
> >> +     *
> >> +     * This is called by dma_buf_pin and lets the exporter know that the
> >> +     * DMA-buf can't be moved any more.
> >> +     *
> >> +     * This is called with the dmabuf->resv object locked.
> >> +     *
> >> +     * This callback is optional.
> >> +     *
> >> +     * Returns:
> >> +     *
> >> +     * 0 on success, negative error code on failure.
> >> +     */
> >> +    int (*pin)(struct dma_buf_attachment *attach);
> >> +
> >> +    /**
> >> +     * @unpin:
> >> +     *
> >> +     * This is called by dma_buf_unpin and lets the exporter know that the
> >> +     * DMA-buf can be moved again.
> >> +     *
> >> +     * This is called with the dmabuf->resv object locked.
> >> +     *
> >> +     * This callback is optional.
> >> +     */
> >> +    void (*unpin)(struct dma_buf_attachment *attach);
> >> +
> >>      /**
> >>       * @map_dma_buf:
> >>       *
> >>       * This is called by dma_buf_map_attachment() and is used to map a
> >>       * shared &dma_buf into device address space, and it is mandatory. It
> >> -     * can only be called if @attach has been called successfully. This
> >> -     * essentially pins the DMA buffer into place, and it cannot be moved
> >> -     * any more
> >> +     * can only be called if @attach has been called successfully.
> >>       *
> >>       * This call may sleep, e.g. when the backing storage first needs to be
> >>       * allocated, or moved to a location suitable for all currently attached
> >> @@ -120,6 +146,9 @@ struct dma_buf_ops {
> >>       * any other kind of sharing that the exporter might wish to make
> >>       * available to buffer-users.
> >>       *
> >> +     * This is always called with the dmabuf->resv object locked when
> >> +     * the pin/unpin callbacks are implemented.
> >> +     *
> >>       * Returns:
> >>       *
> >>       * A &sg_table scatter list of or the backing storage of the DMA buffer,
> >> @@ -137,9 +166,6 @@ struct dma_buf_ops {
> >>       *
> >>       * This is called by dma_buf_unmap_attachment() and should unmap and
> >>       * release the &sg_table allocated in @map_dma_buf, and it is mandatory.
> >> -     * It should also unpin the backing storage if this is the last mapping
> >> -     * of the DMA buffer, it the exporter supports backing storage
> >> -     * migration.
> >>       */
> >>      void (*unmap_dma_buf)(struct dma_buf_attachment *,
> >>                            struct sg_table *,
> >> @@ -330,6 +356,34 @@ struct dma_buf {
> >>      } cb_excl, cb_shared;
> >>   };
> >>
> >> +/**
> >> + * struct dma_buf_attach_ops - importer operations for an attachment
> >> + * @move_notify: [optional] notification that the DMA-buf is moving
> >> + *
> >> + * Attachment operations implemented by the importer.
> >> + */
> >> +struct dma_buf_attach_ops {
> >> +    /**
> >> +     * @move_notify
> >> +     *
> >> +     * If this callback is provided the framework can avoid pinning the
> >> +     * backing store while mappings exists.
> >> +     *
> >> +     * This callback is called with the lock of the reservation object
> >> +     * associated with the dma_buf held and the mapping function must be
> >> +     * called with this lock held as well. This makes sure that no mapping
> >> +     * is created concurrently with an ongoing move operation.
> >> +     *
> >> +     * Mappings stay valid and are not directly affected by this callback.
> >> +     * But the DMA-buf can now be in a different physical location, so all
> >> +     * mappings should be destroyed and re-created as soon as possible.
> >> +     *
> >> +     * New mappings can be created after this callback returns, and will
> >> +     * point to the new location of the DMA-buf.
> >> +     */
> >> +    void (*move_notify)(struct dma_buf_attachment *attach);
> >> +};
> >> +
> >>   /**
> >>    * struct dma_buf_attachment - holds device-buffer attachment data
> >>    * @dmabuf: buffer for this attachment.
> >> @@ -338,6 +392,8 @@ struct dma_buf {
> >>    * @sgt: cached mapping.
> >>    * @dir: direction of cached mapping.
> >>    * @priv: exporter specific attachment data.
> >> + * @importer_ops: importer operations for this attachment.
> >> + * @importer_priv: importer specific attachment data.
> >>    *
> >>    * This structure holds the attachment information between the dma_buf buffer
> >>    * and its user device(s). The list contains one attachment struct per device
> >> @@ -355,6 +411,9 @@ struct dma_buf_attachment {
> >>      struct sg_table *sgt;
> >>      enum dma_data_direction dir;
> >>      void *priv;
> >> +
> >> +    const struct dma_buf_attach_ops *importer_ops;
> >> +    void *importer_priv;
> >>   };
> >>
> >>   /**
> >> @@ -405,10 +464,42 @@ static inline void get_dma_buf(struct dma_buf *dmabuf)
> >>      get_file(dmabuf->file);
> >>   }
> >>
> >> +/**
> >> + * dma_buf_is_dynamic - check if a DMA-buf uses dynamic mappings.
> >> + * @dmabuf: the DMA-buf to check
> >> + *
> >> + * Returns true if a DMA-buf exporter wants to create dynamic sg table mappings
> >> + * for each attachment. False if only a single static sg table should be used.
> >> + */
> >> +static inline bool dma_buf_is_dynamic(struct dma_buf *dmabuf)
> >> +{
> >> +    return !!dmabuf->ops->pin;
> >> +}
> >> +
> >> +/**
> >> + * dma_buf_attachment_is_dynamic - check if a DMA-buf attachment uses dynamic
> >> + * mappinsg
> >> + * @attach: the DMA-buf attachment to check
> >> + *
> >> + * Returns true if a DMA-buf importer wants to use dynamic sg table mappings and
> >> + * calls the map/unmap functions with the reservation object locked.
> >> + */
> >> +static inline bool
> >> +dma_buf_attachment_is_dynamic(struct dma_buf_attachment *attach)
> >> +{
> >> +    return attach->importer_ops && attach->importer_ops->move_notify;
> >> +}
> >> +
> >>   struct dma_buf_attachment *dma_buf_attach(struct dma_buf *dmabuf,
> >> -                                                    struct device *dev);
> >> +                                      struct device *dev);
> >> +struct dma_buf_attachment *
> >> +dma_buf_dynamic_attach(struct dma_buf *dmabuf, struct device *dev,
> >> +                   const struct dma_buf_attach_ops *importer_ops,
> >> +                   void *importer_priv);
> >>   void dma_buf_detach(struct dma_buf *dmabuf,
> >> -                            struct dma_buf_attachment *dmabuf_attach);
> >> +                struct dma_buf_attachment *attach);
> >> +int dma_buf_pin(struct dma_buf_attachment *attach);
> >> +void dma_buf_unpin(struct dma_buf_attachment *attach);
> >>
> >>   struct dma_buf *dma_buf_export(const struct dma_buf_export_info *exp_info);
> >>
> >> @@ -420,6 +511,7 @@ struct sg_table *dma_buf_map_attachment(struct dma_buf_attachment *,
> >>                                      enum dma_data_direction);
> >>   void dma_buf_unmap_attachment(struct dma_buf_attachment *, struct sg_table *,
> >>                              enum dma_data_direction);
> >> +void dma_buf_move_notify(struct dma_buf *dma_buf);
> >>   int dma_buf_begin_cpu_access(struct dma_buf *dma_buf,
> >>                           enum dma_data_direction dir);
> >>   int dma_buf_end_cpu_access(struct dma_buf *dma_buf,
> >> --
> >> 2.17.1
> >>
> >> _______________________________________________
> >> Intel-gfx mailing list
> >> Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> >> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
>


-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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