C++ (Cpp) vb2_get_contig_userptr Examples

Example #1

File: videobuf2-dma-contig.c Project: 0xroot/Blackphone-BP1-Kernel

static void *vb2_dma_contig_get_userptr(void *alloc_ctx, unsigned long vaddr,
					unsigned long size, int write)
{
	struct vb2_dc_buf *buf;
	struct vm_area_struct *vma;
	dma_addr_t dma_addr = 0;
	int ret;

	buf = kzalloc(sizeof *buf, GFP_KERNEL);
	if (!buf)
		return ERR_PTR(-ENOMEM);

	ret = vb2_get_contig_userptr(vaddr, size, &vma, &dma_addr);
	if (ret) {
		printk(KERN_ERR "Failed acquiring VMA for vaddr 0x%08lx\n",
				vaddr);
		kfree(buf);
		return ERR_PTR(ret);
	}

	buf->size = size;
	buf->dma_addr = dma_addr;
	buf->vma = vma;

	return buf;
}

Example #2

File: qvideobuf2-vmalloc.c Project: binkybear/kangaroo

static void *vb2_vmalloc_get_userptr(void *alloc_ctx, unsigned long vaddr,
				     unsigned long size, int write)
{
	struct vb2_vmalloc_buf *buf;
	unsigned long first, last;
	int n_pages, offset;
	struct vm_area_struct *vma;
	dma_addr_t physp;

	buf = kzalloc(sizeof(*buf), GFP_KERNEL);
	if (!buf)
		return NULL;

	buf->write = write;
	offset = vaddr & ~PAGE_MASK;
	buf->size = size;


	vma = find_vma(current->mm, vaddr);
	if (vma && (vma->vm_flags & VM_PFNMAP) && (vma->vm_pgoff)) {
		if (vb2_get_contig_userptr(vaddr, size, &vma, &physp))
			goto fail_pages_array_alloc;
		buf->vma = vma;
		buf->vaddr = ioremap_nocache(physp, size);
		if (!buf->vaddr)
			goto fail_pages_array_alloc;
	} else {
		first = vaddr >> PAGE_SHIFT;
		last  = (vaddr + size - 1) >> PAGE_SHIFT;
		buf->n_pages = last - first + 1;
		buf->pages = kzalloc(buf->n_pages * sizeof(struct page *),
				     GFP_KERNEL);
		if (!buf->pages)
			goto fail_pages_array_alloc;

		/* current->mm->mmap_sem is taken by videobuf2 core */
		n_pages = get_user_pages(current, current->mm,
					 vaddr & PAGE_MASK, buf->n_pages,
					 write, 1, /* force */
					 buf->pages, NULL);
		if (n_pages != buf->n_pages)
			goto fail_get_user_pages;

		buf->vaddr = vm_map_ram(buf->pages, buf->n_pages, -1,
					PAGE_KERNEL);
		if (!buf->vaddr)
			goto fail_get_user_pages;
	}

	buf->vaddr += offset;
	return buf;

fail_get_user_pages:
	pr_debug("get_user_pages requested/got: %d/%d]\n", n_pages,
		 buf->n_pages);
	while (--n_pages >= 0)
		put_page(buf->pages[n_pages]);
	kfree(buf->pages);

fail_pages_array_alloc:
	kfree(buf);

	return NULL;
}