On Tue, 2008-05-06 at 13:31 +0200, Takashi Iwai wrote: > > 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... > > In most cases, it can be obtained via pfn_to_page(), I suppose. But, > it's definitely arch-specific thingy, and a generic solution would be > really appreciated.
You can't get a pfn out of the result of dma_alloc_coherent on non-coherent powerpc at least. It's a virtual mapping created from the underlying pages set to be non-cacheable. virt_to_* will do no good. > Alternatively, we can change the ALSA PCM core code that accesses the > virtual linear buffer and handles SG-buffers as they are. Maybe it'll > give a bit more useful clean-up in the whole memory-management codes > in ALSA in the end. I need to get my head around what the exact usage in Alsa is, and it's a bit too late for me to thing right now :-) Ben. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
