参照元†
- void *buf_priv
- struct vm_area_struct *vma
返り値†
static int vb2_dc_mmap(void *buf_priv, struct vm_area_struct *vma)
{
struct vb2_dc_buf *buf = buf_priv;
int ret;
if (!buf) {
printk(KERN_ERR "No buffer to map\n");
return -EINVAL;
}
/*
* dma_mmap_* uses vm_pgoff as in-buffer offset, but we want to
* map whole buffer
*/
vma->vm_pgoff = 0;
ret = dma_mmap_coherent(buf->dev, vma, buf->vaddr,
buf->dma_addr, buf->size);
if (ret) {
pr_err("Remapping memory failed, error: %d\n", ret);
return ret;
}
vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
vma->vm_private_data = &buf->handler;
vma->vm_ops = &vb2_common_vm_ops;
vma->vm_ops->open(vma);
pr_debug("%s: mapped dma addr 0x%08lx at 0x%08lx, size %ld\n",
__func__, (unsigned long)buf->dma_addr, vma->vm_start,
buf->size);
return 0;
}
コメント†