[PATCH 3/6] dma-buf: add peer2peer flag

[Daniel Vetter]

On Thu, Apr 18, 2019 at 02:09:25PM +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 at amd.com>

Should we add something like "Such importers should also support dynamic
dma_buf attachments." to the kerneldoc?

Either way lgtm

Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>
> ---
>  drivers/dma-buf/dma-buf.c | 1 +
>  include/linux/dma-buf.h   | 4 ++++
>  2 files changed, 5 insertions(+)
> 
> diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
> index f23ff8355505..3ab49b492017 100644
> --- a/drivers/dma-buf/dma-buf.c
> +++ b/drivers/dma-buf/dma-buf.c
> @@ -563,6 +563,7 @@ struct dma_buf_attachment *dma_buf_attach(const struct dma_buf_attach_info *info
>  
>  	attach->dev = info->dev;
>  	attach->dmabuf = dmabuf;
> +	attach->peer2peer = info->peer2peer;
>  	attach->importer_priv = info->importer_priv;
>  	attach->invalidate = info->invalidate;
>  
> diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h
> index a615b74e5894..d2746bdfe92c 100644
> --- a/include/linux/dma-buf.h
> +++ b/include/linux/dma-buf.h
> @@ -346,6 +346,7 @@ struct dma_buf {
>   * @dmabuf: buffer for this attachment.
>   * @dev: device attached to the buffer.
>   * @node: list of dma_buf_attachment.
> + * @peer2peer: true if the importer can handle peer resources without pages.
>   * @priv: exporter specific attachment data.
>   * @importer_priv: importer specific attachment data.
>   *
> @@ -362,6 +363,7 @@ struct dma_buf_attachment {
>  	struct dma_buf *dmabuf;
>  	struct device *dev;
>  	struct list_head node;
> +	bool peer2peer;
>  	void *priv;
>  	struct sg_table *sgt;
>  	void *importer_priv;
> @@ -427,6 +429,7 @@ struct dma_buf_export_info {
>   * struct dma_buf_attach_info - holds information needed to attach to a dma_buf
>   * @dmabuf:		the exported dma_buf
>   * @dev:		the device which wants to import the attachment
> + * @peer2peer:		true if the importer can handle peer resources without pages
>   * @importer_priv:	private data of importer to this attachment
>   * @invalidate:		callback to use for invalidating mappings
>   *
> @@ -436,6 +439,7 @@ struct dma_buf_export_info {
>  struct dma_buf_attach_info {
>  	struct dma_buf *dmabuf;
>  	struct device *dev;
> +	bool peer2peer;
>  	void *importer_priv;
>  	void (*invalidate)(struct dma_buf_attachment *attach);
>  };
> -- 
> 2.17.1
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch