/*
* helper functions for vmalloc video4linux capture buffers
*
- * The functions expect the hardware being able to scatter gatter
+ * 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.
#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(); }
+#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;
+static int debug;
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)
+#define dprintk(level, fmt, arg...) \
+ if (debug >= level) \
+ printk(KERN_DEBUG "vbuf-vmalloc: " fmt , ## arg)
/***************************************************************************/
-static void
-videobuf_vm_open(struct vm_area_struct *vma)
+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);
+ dprintk(2, "vm_open %p [count=%u,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)
+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);
+ dprintk(2, "vm_close %p [count=%u,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);
+ struct videobuf_vmalloc_memory *mem;
+
+ dprintk(1, "munmap %p q=%p\n", map, q);
+ mutex_lock(&q->vb_lock);
+
+ /* We need first to cancel streams, before unmapping */
+ if (q->streaming)
+ videobuf_queue_cancel(q);
+
for (i = 0; i < VIDEO_MAX_FRAME; i++) {
if (NULL == q->bufs[i])
continue;
- mem=q->bufs[i]->priv;
- if (!mem)
+ if (q->bufs[i]->map != map)
continue;
- MAGIC_CHECK(mem->magic,MAGIC_VMAL_MEM);
+ mem = q->bufs[i]->priv;
+ if (mem) {
+ /* This callback is called only if kernel has
+ allocated memory and this memory is mmapped.
+ In this case, memory should be freed,
+ in order to do memory unmap.
+ */
- if (mem->map != map)
- continue;
- mem->map = NULL;
+ MAGIC_CHECK(mem->magic, MAGIC_VMAL_MEM);
+
+ /* vfree is not atomic - can't be
+ called with IRQ's disabled
+ */
+ dprintk(1, "%s: buf[%d] freeing (%p)\n",
+ __func__, i, mem->vmalloc);
+
+ vfree(mem->vmalloc);
+ mem->vmalloc = NULL;
+ }
+
+ q->bufs[i]->map = NULL;
q->bufs[i]->baddr = 0;
- q->ops->buf_release(q,q->bufs[i]);
}
- mutex_unlock(&q->lock);
+
kfree(map);
+
+ mutex_unlock(&q->vb_lock);
}
+
return;
}
-static struct vm_operations_struct videobuf_vm_ops =
-{
+static const struct vm_operations_struct videobuf_vm_ops = {
.open = videobuf_vm_open,
.close = videobuf_vm_close,
};
/* Allocated area consists on 3 parts:
struct video_buffer
struct <driver>_buffer (cx88_buffer, saa7134_buf, ...)
- struct videobuf_pci_sg_memory
+ struct videobuf_dma_sg_memory
*/
static void *__videobuf_alloc(size_t size)
{
- struct videbuf_vmalloc_memory *mem;
+ struct videobuf_vmalloc_memory *mem;
struct videobuf_buffer *vb;
- vb = kzalloc(size+sizeof(*mem),GFP_KERNEL);
+ vb = kzalloc(size + sizeof(*mem), GFP_KERNEL);
+ if (!vb)
+ return vb;
- mem = vb->priv = ((char *)vb)+size;
- mem->magic=MAGIC_VMAL_MEM;
+ 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));
+ dprintk(1, "%s: allocated at %p(%ld+%ld) & %p(%ld)\n",
+ __func__, 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)
+static int __videobuf_iolock(struct videobuf_queue *q,
+ struct videobuf_buffer *vb,
+ struct v4l2_framebuffer *fbuf)
{
+ struct videobuf_vmalloc_memory *mem = vb->priv;
int pages;
- struct videbuf_vmalloc_memory *mem=vb->priv;
-
-
BUG_ON(!mem);
- MAGIC_CHECK(mem->magic,MAGIC_VMAL_MEM);
+ MAGIC_CHECK(mem->magic, MAGIC_VMAL_MEM);
+ switch (vb->memory) {
+ case V4L2_MEMORY_MMAP:
+ dprintk(1, "%s memory method MMAP\n", __func__);
- pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
+ /* All handling should be done by __videobuf_mmap_mapper() */
+ if (!mem->vmalloc) {
+ printk(KERN_ERR "memory is not alloced/mmapped.\n");
+ return -EINVAL;
+ }
+ break;
+ case V4L2_MEMORY_USERPTR:
+ pages = PAGE_ALIGN(vb->size);
- /* 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;
- }
+ dprintk(1, "%s memory method USERPTR\n", __func__);
- /* 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;
- }
+ if (vb->baddr) {
+ printk(KERN_ERR "USERPTR is currently not supported\n");
+ return -EINVAL;
+ }
- dprintk(1,"vmalloc is at addr 0x%08lx, size=%d\n",
- (unsigned long)mem->vmalloc,
- pages << PAGE_SHIFT);
+ /* The only USERPTR currently supported is the one needed for
+ * read() method.
+ */
- /* 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;
+ mem->vmalloc = vmalloc_user(pages);
+ if (!mem->vmalloc) {
+ printk(KERN_ERR "vmalloc (%d pages) failed\n", pages);
+ return -ENOMEM;
}
+ dprintk(1, "vmalloc is at addr %p (%d pages)\n",
+ mem->vmalloc, pages);
+
+#if 0
+ int rc;
+ /* Kernel userptr is used also by read() method. In this case,
+ there's no need to remap, since data will be copied to user
+ */
+ if (!vb->baddr)
+ return 0;
+
+ /* FIXME: to properly support USERPTR, remap should occur.
+ The code below won't work, since mem->vma = NULL
+ */
+ /* Try to remap memory */
+ rc = remap_vmalloc_range(mem->vma, (void *)vb->baddr, 0);
+ if (rc < 0) {
+ printk(KERN_ERR "mmap: remap failed with error %d", rc);
+ return -ENOMEM;
+ }
+#endif
+
+ break;
+ case V4L2_MEMORY_OVERLAY:
+ default:
+ dprintk(1, "%s memory method OVERLAY/unknown\n", __func__);
+
+ /* Currently, doesn't support V4L2_MEMORY_OVERLAY */
+ printk(KERN_ERR "Memory method currently unsupported.\n");
+ return -EINVAL;
}
return 0;
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_vmalloc_memory *mem;
struct videobuf_mapping *map;
unsigned int first;
- int retval;
+ int retval, pages;
unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
- if (! (vma->vm_flags & VM_WRITE) || ! (vma->vm_flags & VM_SHARED))
+ dprintk(1, "%s\n", __func__);
+ if (!(vma->vm_flags & VM_WRITE) || !(vma->vm_flags & VM_SHARED))
return -EINVAL;
/* look for first buffer to map */
break;
}
if (VIDEO_MAX_FRAME == first) {
- dprintk(1,"mmap app bug: offset invalid [offset=0x%lx]\n",
+ 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);
+ map = kzalloc(sizeof(struct videobuf_mapping), GFP_KERNEL);
if (NULL == map)
return -ENOMEM;
+ q->bufs[first]->map = map;
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;
+ mem = q->bufs[first]->priv;
+ BUG_ON(!mem);
+ MAGIC_CHECK(mem->magic, MAGIC_VMAL_MEM);
+
+ pages = PAGE_ALIGN(vma->vm_end - vma->vm_start);
+ mem->vmalloc = vmalloc_user(pages);
+ if (!mem->vmalloc) {
+ printk(KERN_ERR "vmalloc (%d pages) failed\n", pages);
+ goto error;
+ }
+ dprintk(1, "vmalloc is at addr %p (%d pages)\n", mem->vmalloc, pages);
/* 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));
+ retval = remap_vmalloc_range(vma, mem->vmalloc, 0);
+ if (retval < 0) {
+ printk(KERN_ERR "mmap: remap failed with error %d. ", retval);
+ vfree(mem->vmalloc);
+ goto error;
}
- dprintk(1,"mmap %p: q=%p %08lx-%08lx (%lx) pgoff %08lx buf %d\n",
- map,q,vma->vm_start,vma->vm_end,
+ vma->vm_ops = &videobuf_vm_ops;
+ vma->vm_flags |= VM_DONTEXPAND | VM_RESERVED;
+ vma->vm_private_data = map;
+
+ 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);
+ 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 0;
- return (mem->map)?1:0;
+error:
+ mem = NULL;
+ kfree(map);
+ return -ENOMEM;
}
-static int __videobuf_copy_to_user ( struct videobuf_queue *q,
- char __user *data, size_t count,
- int nonblocking )
+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);
+ struct videobuf_vmalloc_memory *mem = q->read_buf->priv;
+ BUG_ON(!mem);
+ MAGIC_CHECK(mem->magic, MAGIC_VMAL_MEM);
- BUG_ON (!mem->vmalloc);
+ BUG_ON(!mem->vmalloc);
/* copy to userspace */
if (count > q->read_buf->size - q->read_off)
return count;
}
-static int __videobuf_copy_stream ( struct videobuf_queue *q,
- char __user *data, size_t count, size_t pos,
- int vbihack, int nonblocking )
+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);
+ unsigned int *fc;
+ struct videobuf_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 = (unsigned int *)mem->vmalloc;
+ fc += (q->read_buf->size >> 2) - 1;
*fc = q->read_buf->field_count >> 1;
- dprintk(1,"vbihack: %d\n",*fc);
+ dprintk(1, "vbihack: %d\n", *fc);
}
/* copy stuff using the common method */
- count = __videobuf_copy_to_user (q,data,count,nonblocking);
+ count = __videobuf_copy_to_user(q, data, count, nonblocking);
- if ( (count==-EFAULT) && (0 == pos) )
+ if ((count == -EFAULT) && (0 == pos))
return -EFAULT;
return count;
.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,
+ .video_copy_to_user = __videobuf_copy_to_user,
.copy_stream = __videobuf_copy_stream,
+ .vmalloc = videobuf_to_vmalloc,
};
-void videobuf_queue_vmalloc_init(struct videobuf_queue* q,
- struct videobuf_queue_ops *ops,
- void *dev,
+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)
{
- videobuf_queue_init(q, ops, dev, irqlock, type, field, msize, priv);
- q->int_ops=&qops;
+ videobuf_queue_core_init(q, ops, dev, irqlock, type, field, msize,
+ priv, &qops);
}
-
EXPORT_SYMBOL_GPL(videobuf_queue_vmalloc_init);
-void *videobuf_to_vmalloc (struct videobuf_buffer *buf)
+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);
+ struct videobuf_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)
+void videobuf_vmalloc_free(struct videobuf_buffer *buf)
{
- struct videbuf_vmalloc_memory *mem=buf->priv;
- BUG_ON (!mem);
+ struct videobuf_vmalloc_memory *mem = buf->priv;
+
+ /* mmapped memory can't be freed here, otherwise mmapped region
+ would be released, while still needed. In this case, the memory
+ release should happen inside videobuf_vm_close().
+ So, it should free memory only if the memory were allocated for
+ read() operation.
+ */
+ if ((buf->memory != V4L2_MEMORY_USERPTR) || buf->baddr)
+ return;
- MAGIC_CHECK(mem->magic,MAGIC_VMAL_MEM);
+ if (!mem)
+ return;
+
+ MAGIC_CHECK(mem->magic, MAGIC_VMAL_MEM);
vfree(mem->vmalloc);
- mem->vmalloc=NULL;
+ mem->vmalloc = NULL;
return;
}
EXPORT_SYMBOL_GPL(videobuf_vmalloc_free);
-/*
- * Local variables:
- * c-basic-offset: 8
- * End:
- */
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff