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authorChristian König <christian.koenig@amd.com>2018-07-03 16:42:26 +0200
committerChristian König <christian.koenig@amd.com>2019-05-22 15:34:55 +0200
commitf13e143e7444bffc53f5c2904aeed76646da69d6 (patch)
tree4ed65a0e40c79e2b9fe76755ad481457c9a19b73 /include/linux/dma-buf.h
parent0c7b178ad7eb68734feb21e4cfba9ea398f22668 (diff)
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dma-buf: start caching of sg_table objects v2
To allow a smooth transition from pinning buffer objects to dynamic invalidation we first start to cache the sg_table for an attachment. v2: keep closer to the DRM implementation Signed-off-by: Christian König <christian.koenig@amd.com> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.kernel.org/patch/10943053/
Diffstat (limited to 'include/linux/dma-buf.h')
-rw-r--r--include/linux/dma-buf.h13
1 files changed, 13 insertions, 0 deletions
diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h
index a0bd071466fc..8a327566d7f4 100644
--- a/include/linux/dma-buf.h
+++ b/include/linux/dma-buf.h
@@ -45,6 +45,15 @@ struct dma_buf_attachment;
*/
struct dma_buf_ops {
/**
+ * @cache_sgt_mapping:
+ *
+ * If true the framework will cache the first mapping made for each
+ * attachment. This avoids creating mappings for attachments multiple
+ * times.
+ */
+ bool cache_sgt_mapping;
+
+ /**
* @attach:
*
* This is called from dma_buf_attach() to make sure that a given
@@ -323,6 +332,8 @@ struct dma_buf {
* @dmabuf: buffer for this attachment.
* @dev: device attached to the buffer.
* @node: list of dma_buf_attachment.
+ * @sgt: cached mapping.
+ * @dir: direction of cached mapping.
* @priv: exporter specific attachment data.
*
* This structure holds the attachment information between the dma_buf buffer
@@ -338,6 +349,8 @@ struct dma_buf_attachment {
struct dma_buf *dmabuf;
struct device *dev;
struct list_head node;
+ struct sg_table *sgt;
+ enum dma_data_direction dir;
void *priv;
};