/*
* 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_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");
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;
int i;
- dprintk(2,"vm_close %p [count=%u,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);
+ 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;
if (q->bufs[i]->map != map)
continue;
- q->ops->buf_release(q,q->bufs[i]);
+ 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.
+ */
+
+ 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;
}
- mutex_unlock(&q->vb_lock);
+
kfree(map);
+
+ mutex_unlock(&q->vb_lock);
}
+
return;
}
/* 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)
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),
+ __func__,vb,(long)sizeof(*vb),(long)size-sizeof(*vb),
mem,(long)sizeof(*mem));
return vb;
struct videobuf_buffer *vb,
struct v4l2_framebuffer *fbuf)
{
+ struct videobuf_vmalloc_memory *mem = vb->priv;
int pages;
- struct videobuf_vmalloc_memory *mem=vb->priv;
BUG_ON(!mem);
- MAGIC_CHECK(mem->magic,MAGIC_VMAL_MEM);
+ MAGIC_CHECK(mem->magic, MAGIC_VMAL_MEM);
- pages = PAGE_ALIGN(vb->size) >> PAGE_SHIFT;
+ switch (vb->memory) {
+ case V4L2_MEMORY_MMAP:
+ dprintk(1, "%s memory method MMAP\n", __func__);
- /* 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;
- }
+ /* 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);
- /* FIXME: should be tested with kernel mmap mem */
- mem->vmalloc=vmalloc_user (PAGE_ALIGN(vb->size));
- if (NULL == mem->vmalloc) {
- printk(KERN_ERR "vmalloc (%d pages) failed\n",pages);
- return -ENOMEM;
- }
+ dprintk(1, "%s memory method USERPTR\n", __func__);
- dprintk(1,"vmalloc is at addr 0x%08lx, size=%d\n",
- (unsigned long)mem->vmalloc,
- pages << PAGE_SHIFT);
+#if 1
+ if (vb->baddr) {
+ printk(KERN_ERR "USERPTR is currently not supported\n");
+ return -EINVAL;
+ }
+#endif
- /* 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;
+ /* The only USERPTR currently supported is the one needed for
+ read() method.
+ */
+
+ 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 bellow 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;
{
unsigned int i;
+ dprintk(1, "%s\n", __func__);
for (i = 0; i < VIDEO_MAX_FRAME; i++) {
if (q->bufs[i]) {
if (q->bufs[i]->map)
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 */
}
/* create mapping + update buffer list */
- map = q->bufs[first]->map = kzalloc(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);
- 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);
- q->bufs[first]->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;
}
+ 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,
+ 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);
+ return 0;
+
+error:
+ mem = NULL;
+ kfree(map);
+ return -ENOMEM;
}
static int __videobuf_copy_to_user ( struct videobuf_queue *q,
.mmap_mapper = __videobuf_mmap_mapper,
.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,
void videobuf_vmalloc_free (struct videobuf_buffer *buf)
{
- struct videobuf_vmalloc_memory *mem=buf->priv;
- BUG_ON (!mem);
+ struct videobuf_vmalloc_memory *mem = buf->priv;
- MAGIC_CHECK(mem->magic,MAGIC_VMAL_MEM);
+ /* 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 == 0))
+ return;
+
+ if (!mem)
+ return;
+
+ MAGIC_CHECK(mem->magic, MAGIC_VMAL_MEM);
vfree(mem->vmalloc);
- mem->vmalloc=NULL;
+ mem->vmalloc = NULL;
return;
}
git.openpandora.org / pandora-kernel.git / blobdiff