[linux-2.6-block.git] / drivers / media / video / videobuf-vmalloc.c

/*
 * helper functions for vmalloc video4linux capture buffers
 *
 * The functions expect the hardware being able to scatter gatter
 * (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@infradead.org>
 *
 * 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; either version 2
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/slab.h>
#include <linux/interrupt.h>

#include <linux/pci.h>
#include <linux/vmalloc.h>
#include <linux/pagemap.h>
#include <asm/page.h>
#include <asm/pgtable.h>

#include <media/videobuf-vmalloc.h>

#define MAGIC_DMABUF   0x17760309
#define MAGIC_VMAL_MEM 0x18221223

#define MAGIC_CHECK(is,should)	if (unlikely((is) != (should))) \
	{ printk(KERN_ERR "magic mismatch: %x (expected %x)\n",is,should); BUG(); }

static int debug = 0;
module_param(debug, int, 0644);

MODULE_DESCRIPTION("helper module to manage video4linux vmalloc buffers");
MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
MODULE_LICENSE("GPL");

#define dprintk(level, fmt, arg...)	if (debug >= level) \
	printk(KERN_DEBUG "vbuf-sg: " fmt , ## arg)


/***************************************************************************/

static void
videobuf_vm_open(struct vm_area_struct *vma)
{
	struct videobuf_mapping *map = vma->vm_private_data;

	dprintk(2,"vm_open %p [count=%d,vma=%08lx-%08lx]\n",map,
		map->count,vma->vm_start,vma->vm_end);

	map->count++;
}

static void
videobuf_vm_close(struct vm_area_struct *vma)
{
	struct videobuf_mapping *map = vma->vm_private_data;
	struct videobuf_queue *q = map->q;
	struct videbuf_vmalloc_memory *mem;
	int i;

	dprintk(2,"vm_close %p [count=%d,vma=%08lx-%08lx]\n",map,
		map->count,vma->vm_start,vma->vm_end);

	map->count--;
	if (0 == map->count) {
		dprintk(1,"munmap %p q=%p\n",map,q);
		mutex_lock(&q->lock);
		for (i = 0; i < VIDEO_MAX_FRAME; i++) {
			if (NULL == q->bufs[i])
				continue;
			mem=q->bufs[i]->priv;

			if (!mem)
				continue;

			MAGIC_CHECK(mem->magic,MAGIC_VMAL_MEM);

			if (mem->map != map)
				continue;
			mem->map   = NULL;
			q->bufs[i]->baddr = 0;
			q->ops->buf_release(q,q->bufs[i]);
		}
		mutex_unlock(&q->lock);
		kfree(map);
	}
	return;
}

static struct vm_operations_struct videobuf_vm_ops =
{
	.open     = videobuf_vm_open,
	.close    = videobuf_vm_close,
};

/* ---------------------------------------------------------------------
 * vmalloc handlers for the generic methods
 */

/* Allocated area consists on 3 parts:
	struct video_buffer
	struct <driver>_buffer (cx88_buffer, saa7134_buf, ...)
	struct videobuf_pci_sg_memory
 */

static void *__videobuf_alloc(size_t size)
{
	struct videbuf_vmalloc_memory *mem;
	struct videobuf_buffer *vb;

	vb = kzalloc(size+sizeof(*mem),GFP_KERNEL);

	mem = vb->priv = ((char *)vb)+size;
	mem->magic=MAGIC_VMAL_MEM;

	dprintk(1,"%s: allocated at %p(%ld+%ld) & %p(%ld)\n",
		__FUNCTION__,vb,(long)sizeof(*vb),(long)size-sizeof(*vb),
		mem,(long)sizeof(*mem));

	return vb;
}

static int __videobuf_iolock (struct videobuf_queue* q,
			      struct videobuf_buffer *vb,
			      struct v4l2_framebuffer *fbuf)
{
	int pages;

	struct videbuf_vmalloc_memory *mem=vb->priv;


	BUG_ON(!mem);

	MAGIC_CHECK(mem->magic,MAGIC_VMAL_MEM);


	pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;

	/* Currently, doesn't support V4L2_MEMORY_OVERLAY */
	if ((vb->memory != V4L2_MEMORY_MMAP) &&
				(vb->memory != V4L2_MEMORY_USERPTR) ) {
		printk(KERN_ERR "Method currently unsupported.\n");
		return -EINVAL;
	}

	/* FIXME: should be tested with kernel mmap mem */
	mem->vmalloc=vmalloc_user (PAGE_ALIGN(vb->size));
	if (NULL == mem->vmalloc) {
		dprintk(1,"vmalloc (%d pages) failed\n",pages);
		return -ENOMEM;
	}

	dprintk(1,"vmalloc is at addr 0x%08lx, size=%d\n",
				(unsigned long)mem->vmalloc,
				pages << PAGE_SHIFT);

	/* It seems that some kernel versions need to do remap *after*
	   the mmap() call
	 */
	if (mem->vma) {
		int retval=remap_vmalloc_range(mem->vma, mem->vmalloc,0);
		kfree(mem->vma);
		mem->vma=NULL;
		if (retval<0) {
			dprintk(1,"mmap app bug: remap_vmalloc_range area %p error %d\n",
				mem->vmalloc,retval);
			return retval;
		}
	}

	return 0;
}

static int __videobuf_sync(struct videobuf_queue *q,
			   struct videobuf_buffer *buf)
{
	return 0;
}

static int __videobuf_mmap_free(struct videobuf_queue *q)
{
	unsigned int i;

	for (i = 0; i < VIDEO_MAX_FRAME; i++) {
		if (q->bufs[i]) {
			struct videbuf_vmalloc_memory *mem=q->bufs[i]->priv;
			if (mem && mem->map)
				return -EBUSY;
		}
	}

	return 0;
}

static int __videobuf_mmap_mapper(struct videobuf_queue *q,
			 struct vm_area_struct *vma)
{
	struct videbuf_vmalloc_memory *mem;
	struct videobuf_mapping *map;
	unsigned int first;
	int retval;
	unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;

	if (! (vma->vm_flags & VM_WRITE) || ! (vma->vm_flags & VM_SHARED))
		return -EINVAL;

	/* look for first buffer to map */
	for (first = 0; first < VIDEO_MAX_FRAME; first++) {
		if (NULL == q->bufs[first])
			continue;

		if (V4L2_MEMORY_MMAP != q->bufs[first]->memory)
			continue;
		if (q->bufs[first]->boff == offset)
			break;
	}
	if (VIDEO_MAX_FRAME == first) {
		dprintk(1,"mmap app bug: offset invalid [offset=0x%lx]\n",
			(vma->vm_pgoff << PAGE_SHIFT));
		return -EINVAL;
	}
	mem=q->bufs[first]->priv;
	BUG_ON (!mem);
	MAGIC_CHECK(mem->magic,MAGIC_VMAL_MEM);

	/* create mapping + update buffer list */
	map = mem->map = kmalloc(sizeof(struct videobuf_mapping),GFP_KERNEL);
	if (NULL == map)
		return -ENOMEM;

	map->start = vma->vm_start;
	map->end   = vma->vm_end;
	map->q     = q;

	q->bufs[first]->baddr = vma->vm_start;

	vma->vm_ops          = &videobuf_vm_ops;
	vma->vm_flags       |= VM_DONTEXPAND | VM_RESERVED;
	vma->vm_private_data = map;

	/* Try to remap memory */
	retval=remap_vmalloc_range(vma, mem->vmalloc,0);
	if (retval<0) {
		dprintk(1,"mmap: postponing remap_vmalloc_range\n");
		mem->vma=kmalloc(sizeof(*vma),GFP_KERNEL);
		if (!mem->vma) {
			kfree(map);
			mem->map=NULL;
			return -ENOMEM;
		}
		memcpy(mem->vma,vma,sizeof(*vma));
	}

	dprintk(1,"mmap %p: q=%p %08lx-%08lx (%lx) pgoff %08lx buf %d\n",
		map,q,vma->vm_start,vma->vm_end,
		(long int) q->bufs[first]->bsize,
		vma->vm_pgoff,first);

	videobuf_vm_open(vma);

	return (0);
}

static int __videobuf_is_mmapped (struct videobuf_buffer *buf)
{
	struct videbuf_vmalloc_memory *mem=buf->priv;
	BUG_ON (!mem);
	MAGIC_CHECK(mem->magic,MAGIC_VMAL_MEM);

	return (mem->map)?1:0;
}

static int __videobuf_copy_to_user ( struct videobuf_queue *q,
				char __user *data, size_t count,
				int nonblocking )
{
	struct videbuf_vmalloc_memory *mem=q->read_buf->priv;
	BUG_ON (!mem);
	MAGIC_CHECK(mem->magic,MAGIC_VMAL_MEM);

	BUG_ON (!mem->vmalloc);

	/* copy to userspace */
	if (count > q->read_buf->size - q->read_off)
		count = q->read_buf->size - q->read_off;

	if (copy_to_user(data, mem->vmalloc+q->read_off, count))
		return -EFAULT;

	return count;
}

static int __videobuf_copy_stream ( struct videobuf_queue *q,
				char __user *data, size_t count, size_t pos,
				int vbihack, int nonblocking )
{
	unsigned int  *fc;
	struct videbuf_vmalloc_memory *mem=q->read_buf->priv;
	BUG_ON (!mem);
	MAGIC_CHECK(mem->magic,MAGIC_VMAL_MEM);

	if (vbihack) {
		/* dirty, undocumented hack -- pass the frame counter
			* within the last four bytes of each vbi data block.
			* We need that one to maintain backward compatibility
			* to all vbi decoding software out there ... */
		fc  = (unsigned int*)mem->vmalloc;
		fc += (q->read_buf->size>>2) -1;
		*fc = q->read_buf->field_count >> 1;
		dprintk(1,"vbihack: %d\n",*fc);
	}

	/* copy stuff using the common method */
	count = __videobuf_copy_to_user (q,data,count,nonblocking);

	if ( (count==-EFAULT) && (0 == pos) )
		return -EFAULT;

	return count;
}

static struct videobuf_qtype_ops qops = {
	.magic        = MAGIC_QTYPE_OPS,

	.alloc        = __videobuf_alloc,
	.iolock       = __videobuf_iolock,
	.sync         = __videobuf_sync,
	.mmap_free    = __videobuf_mmap_free,
	.mmap_mapper  = __videobuf_mmap_mapper,
	.is_mmapped   = __videobuf_is_mmapped,
	.copy_to_user = __videobuf_copy_to_user,
	.copy_stream  = __videobuf_copy_stream,
};

void videobuf_queue_vmalloc_init(struct videobuf_queue* q,
			 struct videobuf_queue_ops *ops,
			 void *dev,
			 spinlock_t *irqlock,
			 enum v4l2_buf_type type,
			 enum v4l2_field field,
			 unsigned int msize,
			 void *priv)
{
	videobuf_queue_init(q, ops, dev, irqlock, type, field, msize, priv);
	q->int_ops=&qops;
}

EXPORT_SYMBOL_GPL(videobuf_queue_vmalloc_init);

void *videobuf_to_vmalloc (struct videobuf_buffer *buf)
{
	struct videbuf_vmalloc_memory *mem=buf->priv;
	BUG_ON (!mem);
	MAGIC_CHECK(mem->magic,MAGIC_VMAL_MEM);

	return mem->vmalloc;
}
EXPORT_SYMBOL_GPL(videobuf_to_vmalloc);

void videobuf_vmalloc_free (struct videobuf_buffer *buf)
{
	struct videbuf_vmalloc_memory *mem=buf->priv;
	BUG_ON (!mem);

	MAGIC_CHECK(mem->magic,MAGIC_VMAL_MEM);

	vfree(mem->vmalloc);
	mem->vmalloc=NULL;

	return;
}
EXPORT_SYMBOL_GPL(videobuf_vmalloc_free);

/*
 * Local variables:
 * c-basic-offset: 8
 * End:
 */
Commit	Line	Data
87b9ad07 MCC	1	/*
	2	* helper functions for vmalloc video4linux capture buffers
	3	*
	4	* The functions expect the hardware being able to scatter gatter
	5	* (i.e. the buffers are not linear in physical memory, but fragmented
	6	* into PAGE_SIZE chunks). They also assume the driver does not need
	7	* to touch the video data.
	8	*
	9	* (c) 2007 Mauro Carvalho Chehab, <mchehab@infradead.org>
	10	*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License as published by
	13	* the Free Software Foundation; either version 2
	14	*/
	15
	16	#include <linux/init.h>
	17	#include <linux/module.h>
	18	#include <linux/moduleparam.h>
	19	#include <linux/slab.h>
	20	#include <linux/interrupt.h>
	21
	22	#include <linux/pci.h>
	23	#include <linux/vmalloc.h>
	24	#include <linux/pagemap.h>
	25	#include <asm/page.h>
	26	#include <asm/pgtable.h>
	27
	28	#include <media/videobuf-vmalloc.h>
	29
	30	#define MAGIC_DMABUF 0x17760309
	31	#define MAGIC_VMAL_MEM 0x18221223
	32
	33	#define MAGIC_CHECK(is,should) if (unlikely((is) != (should))) \
	34	{ printk(KERN_ERR "magic mismatch: %x (expected %x)\n",is,should); BUG(); }
	35
	36	static int debug = 0;
	37	module_param(debug, int, 0644);
	38
	39	MODULE_DESCRIPTION("helper module to manage video4linux vmalloc buffers");
	40	MODULE_AUTHOR("Mauro Carvalho Chehab <mchehab@infradead.org>");
	41	MODULE_LICENSE("GPL");
	42
	43	#define dprintk(level, fmt, arg...) if (debug >= level) \
	44	printk(KERN_DEBUG "vbuf-sg: " fmt , ## arg)
	45
	46
	47	/***************************************************************************/
	48
	49	static void
	50	videobuf_vm_open(struct vm_area_struct *vma)
	51	{
	52	struct videobuf_mapping *map = vma->vm_private_data;
	53
	54	dprintk(2,"vm_open %p [count=%d,vma=%08lx-%08lx]\n",map,
	55	map->count,vma->vm_start,vma->vm_end);
	56
	57	map->count++;
	58	}
	59
	60	static void
	61	videobuf_vm_close(struct vm_area_struct *vma)
	62	{
	63	struct videobuf_mapping *map = vma->vm_private_data;
	64	struct videobuf_queue *q = map->q;
65	struct videbuf_vmalloc_memory *mem;
66	int i;
67
68	dprintk(2,"vm_close %p [count=%d,vma=%08lx-%08lx]\n",map,
69	map->count,vma->vm_start,vma->vm_end);
70
71	map->count--;
72	if (0 == map->count) {
73	dprintk(1,"munmap %p q=%p\n",map,q);
74	mutex_lock(&q->lock);
75	for (i = 0; i < VIDEO_MAX_FRAME; i++) {
76	if (NULL == q->bufs[i])
77	continue;
78	mem=q->bufs[i]->priv;
79
80	if (!mem)
81	continue;
82
83	MAGIC_CHECK(mem->magic,MAGIC_VMAL_MEM);
84
85	if (mem->map != map)
86	continue;
87	mem->map = NULL;
88	q->bufs[i]->baddr = 0;
89	q->ops->buf_release(q,q->bufs[i]);
90	}
91	mutex_unlock(&q->lock);
92	kfree(map);
93	}
94	return;
95	}
96
97	static struct vm_operations_struct videobuf_vm_ops =
98	{
99	.open = videobuf_vm_open,
100	.close = videobuf_vm_close,
101	};
102
103	/* ---------------------------------------------------------------------
104	* vmalloc handlers for the generic methods
105	*/
106
107	/* Allocated area consists on 3 parts:
108	struct video_buffer
109	struct <driver>_buffer (cx88_buffer, saa7134_buf, ...)
110	struct videobuf_pci_sg_memory
111	*/
112
113	static void *__videobuf_alloc(size_t size)
114	{
115	struct videbuf_vmalloc_memory *mem;
116	struct videobuf_buffer *vb;
117
118	vb = kzalloc(size+sizeof(*mem),GFP_KERNEL);
119
120	mem = vb->priv = ((char *)vb)+size;
121	mem->magic=MAGIC_VMAL_MEM;
122
123	dprintk(1,"%s: allocated at %p(%ld+%ld) & %p(%ld)\n",
124	__FUNCTION__,vb,(long)sizeof(vb),(long)size-sizeof(vb),
125	mem,(long)sizeof(*mem));
126
127	return vb;
128	}
129
130	static int __videobuf_iolock (struct videobuf_queue* q,
131	struct videobuf_buffer *vb,
132	struct v4l2_framebuffer *fbuf)
133	{
134	int pages;
135
136	struct videbuf_vmalloc_memory *mem=vb->priv;
137
138
139	BUG_ON(!mem);
140
141	MAGIC_CHECK(mem->magic,MAGIC_VMAL_MEM);
142
143
144	pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
145
146	/* Currently, doesn't support V4L2_MEMORY_OVERLAY */
147	if ((vb->memory != V4L2_MEMORY_MMAP) &&
148	(vb->memory != V4L2_MEMORY_USERPTR) ) {
149	printk(KERN_ERR "Method currently unsupported.\n");
150	return -EINVAL;
151	}
152
153	/* FIXME: should be tested with kernel mmap mem */
154	mem->vmalloc=vmalloc_user (PAGE_ALIGN(vb->size));
155	if (NULL == mem->vmalloc) {
156	dprintk(1,"vmalloc (%d pages) failed\n",pages);
157	return -ENOMEM;
158	}
159
160	dprintk(1,"vmalloc is at addr 0x%08lx, size=%d\n",
161	(unsigned long)mem->vmalloc,
162	pages << PAGE_SHIFT);
163
164	/* It seems that some kernel versions need to do remap after
165	the mmap() call
166	*/
167	if (mem->vma) {
168	int retval=remap_vmalloc_range(mem->vma, mem->vmalloc,0);
169	kfree(mem->vma);
170	mem->vma=NULL;
171	if (retval<0) {
172	dprintk(1,"mmap app bug: remap_vmalloc_range area %p error %d\n",
173	mem->vmalloc,retval);
174	return retval;
175	}
176	}
177
178	return 0;
179	}
180
181	static int __videobuf_sync(struct videobuf_queue *q,
182	struct videobuf_buffer *buf)
183	{
184	return 0;
185	}
186
187	static int __videobuf_mmap_free(struct videobuf_queue *q)
188	{
189	unsigned int i;
190
191	for (i = 0; i < VIDEO_MAX_FRAME; i++) {
192	if (q->bufs[i]) {
193	struct videbuf_vmalloc_memory *mem=q->bufs[i]->priv;
194	if (mem && mem->map)
195	return -EBUSY;
196	}
197	}
198
199	return 0;
200	}
201
202	static int __videobuf_mmap_mapper(struct videobuf_queue *q,
203	struct vm_area_struct *vma)
204	{
205	struct videbuf_vmalloc_memory *mem;
206	struct videobuf_mapping *map;
207	unsigned int first;
208	int retval;
209	unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
210
211	if (! (vma->vm_flags & VM_WRITE) \|\| ! (vma->vm_flags & VM_SHARED))
212	return -EINVAL;
213
214	/* look for first buffer to map */
215	for (first = 0; first < VIDEO_MAX_FRAME; first++) {
216	if (NULL == q->bufs[first])
217	continue;
218
219	if (V4L2_MEMORY_MMAP != q->bufs[first]->memory)
220	continue;
221	if (q->bufs[first]->boff == offset)
222	break;
223	}
224	if (VIDEO_MAX_FRAME == first) {
225	dprintk(1,"mmap app bug: offset invalid [offset=0x%lx]\n",
226	(vma->vm_pgoff << PAGE_SHIFT));
227	return -EINVAL;
228	}
229	mem=q->bufs[first]->priv;
230	BUG_ON (!mem);
231	MAGIC_CHECK(mem->magic,MAGIC_VMAL_MEM);
232
233	/* create mapping + update buffer list */
234	map = mem->map = kmalloc(sizeof(struct videobuf_mapping),GFP_KERNEL);
235	if (NULL == map)
236	return -ENOMEM;
237
238	map->start = vma->vm_start;
239	map->end = vma->vm_end;
240	map->q = q;
241
242	q->bufs[first]->baddr = vma->vm_start;
243
244	vma->vm_ops = &videobuf_vm_ops;
245	vma->vm_flags \|= VM_DONTEXPAND \| VM_RESERVED;
246	vma->vm_private_data = map;
247
248	/* Try to remap memory */
249	retval=remap_vmalloc_range(vma, mem->vmalloc,0);
250	if (retval<0) {
251	dprintk(1,"mmap: postponing remap_vmalloc_range\n");
252	mem->vma=kmalloc(sizeof(*vma),GFP_KERNEL);
253	if (!mem->vma) {
254	kfree(map);
255	mem->map=NULL;
256	return -ENOMEM;
257	}
258	memcpy(mem->vma,vma,sizeof(*vma));
259	}
260
261	dprintk(1,"mmap %p: q=%p %08lx-%08lx (%lx) pgoff %08lx buf %d\n",
262	map,q,vma->vm_start,vma->vm_end,
263	(long int) q->bufs[first]->bsize,
264	vma->vm_pgoff,first);
265
266	videobuf_vm_open(vma);
267
268	return (0);
269	}
270
271	static int __videobuf_is_mmapped (struct videobuf_buffer *buf)
272	{
273	struct videbuf_vmalloc_memory *mem=buf->priv;
274	BUG_ON (!mem);
275	MAGIC_CHECK(mem->magic,MAGIC_VMAL_MEM);
276
277	return (mem->map)?1:0;
278	}
279
280	static int __videobuf_copy_to_user ( struct videobuf_queue *q,
281	char __user *data, size_t count,
282	int nonblocking )
283	{
284	struct videbuf_vmalloc_memory *mem=q->read_buf->priv;
285	BUG_ON (!mem);
286	MAGIC_CHECK(mem->magic,MAGIC_VMAL_MEM);
287
288	BUG_ON (!mem->vmalloc);
289
290	/* copy to userspace */
291	if (count > q->read_buf->size - q->read_off)
292	count = q->read_buf->size - q->read_off;
293
294	if (copy_to_user(data, mem->vmalloc+q->read_off, count))
295	return -EFAULT;
296
297	return count;
298	}
299
300	static int __videobuf_copy_stream ( struct videobuf_queue *q,
301	char __user *data, size_t count, size_t pos,
302	int vbihack, int nonblocking )
303	{
304	unsigned int *fc;
305	struct videbuf_vmalloc_memory *mem=q->read_buf->priv;
306	BUG_ON (!mem);
307	MAGIC_CHECK(mem->magic,MAGIC_VMAL_MEM);
308
309	if (vbihack) {
310	/* dirty, undocumented hack -- pass the frame counter
311	* within the last four bytes of each vbi data block.
312	* We need that one to maintain backward compatibility
313	* to all vbi decoding software out there ... */
314	fc = (unsigned int*)mem->vmalloc;
315	fc += (q->read_buf->size>>2) -1;
316	*fc = q->read_buf->field_count >> 1;
317	dprintk(1,"vbihack: %d\n",*fc);
318	}
319
320	/* copy stuff using the common method */
321	count = __videobuf_copy_to_user (q,data,count,nonblocking);
322
323	if ( (count==-EFAULT) && (0 == pos) )
324	return -EFAULT;
325
326	return count;
327	}
328
329	static struct videobuf_qtype_ops qops = {
330	.magic = MAGIC_QTYPE_OPS,
331
332	.alloc = __videobuf_alloc,
333	.iolock = __videobuf_iolock,
334	.sync = __videobuf_sync,
335	.mmap_free = __videobuf_mmap_free,
336	.mmap_mapper = __videobuf_mmap_mapper,
337	.is_mmapped = __videobuf_is_mmapped,
338	.copy_to_user = __videobuf_copy_to_user,
339	.copy_stream = __videobuf_copy_stream,
340	};
341
342	void videobuf_queue_vmalloc_init(struct videobuf_queue* q,
343	struct videobuf_queue_ops *ops,
344	void *dev,
345	spinlock_t *irqlock,
346	enum v4l2_buf_type type,
347	enum v4l2_field field,
348	unsigned int msize,
349	void *priv)
350	{
351	videobuf_queue_init(q, ops, dev, irqlock, type, field, msize, priv);
352	q->int_ops=&qops;
353	}
354
355	EXPORT_SYMBOL_GPL(videobuf_queue_vmalloc_init);
356
357	void videobuf_to_vmalloc (struct videobuf_buffer buf)
358	{
359	struct videbuf_vmalloc_memory *mem=buf->priv;
360	BUG_ON (!mem);
361	MAGIC_CHECK(mem->magic,MAGIC_VMAL_MEM);
362
363	return mem->vmalloc;
364	}
365	EXPORT_SYMBOL_GPL(videobuf_to_vmalloc);
366
367	void videobuf_vmalloc_free (struct videobuf_buffer *buf)
368	{
369	struct videbuf_vmalloc_memory *mem=buf->priv;
370	BUG_ON (!mem);
371
372	MAGIC_CHECK(mem->magic,MAGIC_VMAL_MEM);
373
374	vfree(mem->vmalloc);
c520a497	375	mem->vmalloc=NULL;
87b9ad07 MCC	376
	377	return;
	378	}
	379	EXPORT_SYMBOL_GPL(videobuf_vmalloc_free);
	380
	381	/*
	382	* Local variables:
	383	* c-basic-offset: 8
	384	* End:
	385	*/