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
/*
|
|
* 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
|