> Hrm... the problem is that you aren't supposed to make up sglists with > the result of dma_alloc_coherent... It might be a limitation of our core > DMA API, but that's we have to deal with today.. > > If you're going to make up sglists and call vmap, you should allocate > pages with normal GFP. If that is a problem vs. DMA'bility of those > pages, then ... we have a problem :-) > > I don't think we can easily update the DMA API at this stage. What we > could do is provide a way to retrieve the struct page array from the > result of dma_alloc_coherent...
Another option is to allocate the pages with gfp, and then dma_map_sg the result... However, if we do that, we do need to add a way to vmap with the right protection in order to get a coherent (ie. non cacheable) mapping. I'm not even sure all archs can do that.... Ben. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
