On Tue, Jun 26, 2007 at 10:47:16AM -0700, Roland Dreier wrote:
>
> > What about allowing to allocate coherent memory for CQ inside the kernel
> > to fix issue with Altix machines?
>
> Sorry... I've been remiss in posting about this. I would actually
> prefer to see an extension to the dma_map_sg() interface (a new flag
> perhaps?) that would set the right magic bit in the DMA address on
> altix. The refactoring of ib_umem_get() to be called by low-level
> drivers makes this a fairly clean approach, and it avoids the problems
> with using dma_alloc_coherent() to allocate userspace buffers (for
> example, dma_alloc_coherent() uses up kernel virtual addresses, which
> may be scarce on 32 bit architectures).
>
While this make sense it would be hard to push into the kernel proper.
Or no? Are you going to do that?
--
Gleb.
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