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authorAndrzej Pietrasiewicz <andrzej.p@samsung.com>2010-11-29 11:53:34 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2011-03-21 20:31:34 -0300
commit5ba3f757f0592ca001266b4a6214d0332349909c (patch)
tree6d633613aa60123712488647b56341ba41e5e7b2 /include/media/videobuf2-dma-sg.h
parent1a758d4e847f7743ac1b5aa79fde3ba2d8b5132b (diff)
downloadop-kernel-dev-5ba3f757f0592ca001266b4a6214d0332349909c.zip
op-kernel-dev-5ba3f757f0592ca001266b4a6214d0332349909c.tar.gz
[media] v4l: videobuf2: add DMA scatter/gather allocator
Add an implementation of DMA scatter/gather allocator and handling routines for videobuf2. For mmap operation mode it is implemented on top of alloc_page + sg_set_page/_free_page. For userptr operation mode it is implemented on top of get_user_pages + sg_set_page/put_page. Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com> Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> CC: Pawel Osciak <pawel@osciak.com> Reviewed-by: Hans Verkuil <hverkuil@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'include/media/videobuf2-dma-sg.h')
-rw-r--r--include/media/videobuf2-dma-sg.h32
1 files changed, 32 insertions, 0 deletions
diff --git a/include/media/videobuf2-dma-sg.h b/include/media/videobuf2-dma-sg.h
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+++ b/include/media/videobuf2-dma-sg.h
@@ -0,0 +1,32 @@
+/*
+ * videobuf2-dma-sg.h - DMA scatter/gather memory allocator for videobuf2
+ *
+ * Copyright (C) 2010 Samsung Electronics
+ *
+ * Author: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation.
+ */
+
+#ifndef _MEDIA_VIDEOBUF2_DMA_SG_H
+#define _MEDIA_VIDEOBUF2_DMA_SG_H
+
+#include <media/videobuf2-core.h>
+
+struct vb2_dma_sg_desc {
+ unsigned long size;
+ unsigned int num_pages;
+ struct scatterlist *sglist;
+};
+
+static inline struct vb2_dma_sg_desc *vb2_dma_sg_plane_desc(
+ struct vb2_buffer *vb, unsigned int plane_no)
+{
+ return (struct vb2_dma_sg_desc *)vb2_plane_cookie(vb, plane_no);
+}
+
+extern const struct vb2_mem_ops vb2_dma_sg_memops;
+
+#endif
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