1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * helper functions for vmalloc capture buffers
4  *
5  * The functions expect the hardware being able to scatter gather
6  * (i.e. the buffers are not linear in physical memory, but fragmented
7  * into PAGE_SIZE chunks).  They also assume the driver does not need
8  * to touch the video data.
9  *
10  * (c) 2007 Mauro Carvalho Chehab, <mchehab@kernel.org>
11  */
12 #ifndef _VIDEOBUF_VMALLOC_H
13 #define _VIDEOBUF_VMALLOC_H
14 
15 #include <media/videobuf-core.h>
16 
17 /* --------------------------------------------------------------------- */
18 
19 struct videobuf_vmalloc_memory {
20 	u32                 magic;
21 
22 	void                *vaddr;
23 
24 	/* remap_vmalloc_range seems to need to run
25 	 * after mmap() on some cases */
26 	struct vm_area_struct *vma;
27 };
28 
29 void videobuf_queue_vmalloc_init(struct videobuf_queue *q,
30 			 const struct videobuf_queue_ops *ops,
31 			 struct device *dev,
32 			 spinlock_t *irqlock,
33 			 enum v4l2_buf_type type,
34 			 enum v4l2_field field,
35 			 unsigned int msize,
36 			 void *priv,
37 			 struct mutex *ext_lock);
38 
39 void *videobuf_to_vmalloc(struct videobuf_buffer *buf);
40 
41 void videobuf_vmalloc_free(struct videobuf_buffer *buf);
42 
43 #endif
44