xref: /openbmc/linux/include/media/videobuf-vmalloc.h (revision 75bf465f0bc33e9b776a46d6a1b9b990f5fb7c37)

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * helper functions for vmalloc capture buffers
 *
 * The functions expect the hardware being able to scatter gather
 * (i.e. the buffers are not linear in physical memory, but fragmented
 * into PAGE_SIZE chunks).  They also assume the driver does not need
 * to touch the video data.
 *
 * (c) 2007 Mauro Carvalho Chehab, <mchehab@kernel.org>
 */
#ifndef _VIDEOBUF_VMALLOC_H
#define _VIDEOBUF_VMALLOC_H

#include <media/videobuf-core.h>

/* --------------------------------------------------------------------- */

struct videobuf_vmalloc_memory {
	u32                 magic;

	void                *vaddr;

	/* remap_vmalloc_range seems to need to run
	 * after mmap() on some cases */
	struct vm_area_struct *vma;
};

void videobuf_queue_vmalloc_init(struct videobuf_queue *q,
			 const struct videobuf_queue_ops *ops,
			 struct device *dev,
			 spinlock_t *irqlock,
			 enum v4l2_buf_type type,
			 enum v4l2_field field,
			 unsigned int msize,
			 void *priv,
			 struct mutex *ext_lock);

void *videobuf_to_vmalloc(struct videobuf_buffer *buf);

void videobuf_vmalloc_free(struct videobuf_buffer *buf);

#endif