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dma-buf: add peer2peer flag

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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>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Sumit Semwal <sumit.semwal@linaro.org>
Link: https://patchwork.freedesktop.org/patch/359286/
This commit is contained in:
Christian König 2018-03-22 17:09:42 +01:00
parent bdf7e3b782
commit 09606b5446
2 changed files with 12 additions and 0 deletions
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2
drivers/dma-buf/dma-buf.c
View File

@ -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;

10
include/linux/dma-buf.h
View File

@ -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;