-/* struct dma_region
-
- a large, non-physically-contiguous DMA buffer with streaming,
- asynchronous usage characteristics
-*/
-
+/**
+ * struct dma_region - large non-contiguous DMA buffer
+ * @virt: kernel virtual address
+ * @dev: PCI device
+ * @n_pages: number of kernel pages
+ * @n_dma_pages: number of IOMMU pages
+ * @sglist: IOMMU mapping
+ * @direction: PCI_DMA_TODEVICE, etc.
+ *
+ * a large, non-physically-contiguous DMA buffer with streaming, asynchronous
+ * usage characteristics
+ */