linux-kernel - [PATCH 4/8] dma-buf: add peer2peer flag

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Date:   Sun, 25 Mar 2018 12:59:56 +0200
From:   "Christian König" 
        <ckoenig.leichtzumerken@...il.com>
To:     linaro-mm-sig@...ts.linaro.org, linux-media@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, amd-gfx@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 4/8] dma-buf: add peer2peer flag

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@....com>
---
 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 ffaa2f9a9c2c..f420225f93c6 100644
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -565,6 +565,7 @@ 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->priv = info->priv;
 	attach->invalidate = info->invalidate;
 
diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h
index 15dd8598bff1..1ef50bd9bc5b 100644
--- a/include/linux/dma-buf.h
+++ b/include/linux/dma-buf.h
@@ -313,6 +313,7 @@ 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.
  *
  * This structure holds the attachment information between the dma_buf buffer
@@ -328,6 +329,7 @@ struct dma_buf_attachment {
 	struct dma_buf *dmabuf;
 	struct device *dev;
 	struct list_head node;
+	bool peer2peer;
 	void *priv;
 
 	/**
@@ -392,6 +394,7 @@ struct dma_buf_export_info {
  * @dmabuf:	the exported dma_buf
  * @dev:	the device which wants to import the attachment
  * @priv:	private data of importer to this attachment
+ * @peer2peer:	true if the importer can handle peer resources without pages
  * @invalidate:	callback to use for invalidating mappings
  *
  * This structure holds the information required to attach to a buffer. Used
@@ -401,6 +404,7 @@ struct dma_buf_attach_info {
 	struct dma_buf *dmabuf;
 	struct device *dev;
 	void *priv;
+	bool peer2peer;
 	void (*invalidate)(struct dma_buf_attachment *attach);
 };
 
-- 
2.14.1