参照元

説明

引数

返り値

参考

実装

static int __swiotlb_mmap(struct device *dev,
			  struct vm_area_struct *vma,
			  void *cpu_addr, dma_addr_t dma_addr, size_t size,
			  struct dma_attrs *attrs)
{
	int ret = -ENXIO;
	unsigned long nr_vma_pages = (vma->vm_end - vma->vm_start) >>
					PAGE_SHIFT;
	unsigned long nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
	unsigned long pfn = dma_to_phys(dev, dma_addr) >> PAGE_SHIFT;
	unsigned long off = vma->vm_pgoff;
	vma->vm_page_prot = __get_dma_pgprot(attrs, vma->vm_page_prot,
					     is_device_dma_coherent(dev));
	if (dma_mmap_from_coherent(dev, vma, cpu_addr, size, &ret))
		return ret;
	if (off < nr_pages && nr_vma_pages <= (nr_pages - off)) {
		ret = remap_pfn_range(vma, vma->vm_start,
				      pfn + off,
				      vma->vm_end - vma->vm_start,
				      vma->vm_page_prot);
	}
	return ret;
}

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Last-modified: 2018-02-08 (木) 14:39:55