how to mmap which using dma_map_sg() alloc dma buf

hi, all:
i have a question, who would like to help me.

i am writing a video card driver, it support scatter DMA, so i want to using scatterlist and dma_map_sg() to alloc the dma buf, but now i dont know how to write the mmap() function. i see other code using remap_pfn_range(). but in the video_dma_sg.c, __videobuf_mmap_mapper() have not call remap_pfn_range(), why?

Thx,
Figo
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