remarkable-linux/include/media/videobuf2-dma-contig.h
Tomasz Figa ccc66e7382 ARM: 8508/2: videobuf2-dc: Let drivers specify DMA attrs
DMA allocations might be subject to certain requirements specific to the
hardware using the buffers, such as availability of kernel mapping (for
contents fix-ups in the driver). The only entity that knows them is the
driver, so it must share this knowledge with vb2-dc.

This patch extends the alloc_ctx initialization interface to let the
driver specify DMA attrs, which are then stored inside the allocation
context and will be used for all allocations with that context.

As a side effect, all dma_*_coherent() calls are turned into
dma_*_attrs() calls, because the attributes need to be carried over
through all DMA operations.

Signed-off-by: Tomasz Figa <tfiga@chromium.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Tested-by: Javier Martinez Canillas <javier@osg.samsung.com>
Acked-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Acked-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2016-02-11 15:33:38 +00:00

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C

/*
* videobuf2-dma-contig.h - DMA contig memory allocator for videobuf2
*
* Copyright (C) 2010 Samsung Electronics
*
* Author: Pawel Osciak <pawel@osciak.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_CONTIG_H
#define _MEDIA_VIDEOBUF2_DMA_CONTIG_H
#include <media/videobuf2-v4l2.h>
#include <linux/dma-mapping.h>
struct dma_attrs;
static inline dma_addr_t
vb2_dma_contig_plane_dma_addr(struct vb2_buffer *vb, unsigned int plane_no)
{
dma_addr_t *addr = vb2_plane_cookie(vb, plane_no);
return *addr;
}
void *vb2_dma_contig_init_ctx_attrs(struct device *dev,
struct dma_attrs *attrs);
static inline void *vb2_dma_contig_init_ctx(struct device *dev)
{
return vb2_dma_contig_init_ctx_attrs(dev, NULL);
}
void vb2_dma_contig_cleanup_ctx(void *alloc_ctx);
extern const struct vb2_mem_ops vb2_dma_contig_memops;
#endif