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5ba3f757f0
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>
33 lines
816 B
C
33 lines
816 B
C
/*
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* videobuf2-dma-sg.h - DMA scatter/gather memory allocator for videobuf2
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*
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* Copyright (C) 2010 Samsung Electronics
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*
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* Author: Andrzej Pietrasiewicz <andrzej.p@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation.
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*/
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#ifndef _MEDIA_VIDEOBUF2_DMA_SG_H
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#define _MEDIA_VIDEOBUF2_DMA_SG_H
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#include <media/videobuf2-core.h>
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struct vb2_dma_sg_desc {
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unsigned long size;
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unsigned int num_pages;
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struct scatterlist *sglist;
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};
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static inline struct vb2_dma_sg_desc *vb2_dma_sg_plane_desc(
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struct vb2_buffer *vb, unsigned int plane_no)
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{
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return (struct vb2_dma_sg_desc *)vb2_plane_cookie(vb, plane_no);
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}
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extern const struct vb2_mem_ops vb2_dma_sg_memops;
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#endif
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