Re: [PATCH 3/4] dma-buf: add support for mapping with dma mapping attributes

From: Laura Abbott
Date: Fri Jan 18 2019 - 15:48:13 EST

On 1/18/19 10:37 AM, Liam Mark wrote:
Add support for configuring dma mapping attributes when mapping
and unmapping memory through dma_buf_map_attachment and

Signed-off-by: Liam Mark <lmark@xxxxxxxxxxxxxx>
include/linux/dma-buf.h | 3 +++
1 file changed, 3 insertions(+)

diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h
index 58725f890b5b..59bf33e09e2d 100644
--- a/include/linux/dma-buf.h
+++ b/include/linux/dma-buf.h
@@ -308,6 +308,8 @@ struct dma_buf {
* @dev: device attached to the buffer.
* @node: list of dma_buf_attachment.
* @priv: exporter specific attachment data.
+ * @dma_map_attrs: DMA mapping attributes to be used in
+ * dma_buf_map_attachment() and dma_buf_unmap_attachment().
* This structure holds the attachment information between the dma_buf buffer
* and its user device(s). The list contains one attachment struct per device
@@ -323,6 +325,7 @@ struct dma_buf_attachment {
struct device *dev;
struct list_head node;
void *priv;
+ unsigned long dma_map_attrs;

Did you miss part of this patch? This only adds it to the structure but doesn't
add it to any API. The same commment applies to the follow up patch,
I don't quite see how it's being used.