Jens Axboe wrote: > On Thu, Oct 25 2007, Rolf Eike Beer wrote: > > Am Donnerstag, 25. Oktober 2007 schrieb Arjan van de Ven: > > > > Signed-off-by: Hugh Dickins <[email protected]> > > > > --- > > > > Whether this is a complete patch, suitable for all architectures, > > > > I'm not sure: it builds, boots and runs correctly on the x86_32 box > > > > in question, but you'll be a lot wiser than me about using dma_addr_t > > > > for everyone. (Seems a bit of a shame to include <asm/types.h> here, > > > > when I think all arches already get to include it one way or another, > > > > typically via asm/scatterlist.h; but I guess it's safest to repeat > > > > it.) > > > > > > there is a problem with this... sg_phys doesn't return an actual *dma* > > > address.... at least not an address you can give to the device. > > > Using dma_addr_t is thus a bit misleading..... > > > > Ok, then: how do I actually get such an address? > > You use the dma mapping api, Documentation/DMA-mapping.txt Which comes back always to the same point: if I get a buffer from userspace to use for DMA: what can I do then? I need to convert a given list of (physical, pinned) pages to DMA addresses. Eike
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