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    SubjectRe: [Linaro-mm-sig] [PATCH 08/10] mm: cma: Contiguous Memory Allocator added
    On Wednesday 15 June 2011, Michal Nazarewicz wrote:
    > On Tue, 14 Jun 2011 22:42:24 +0200, Arnd Bergmann <> wrote:
    > > * We still need to solve the same problem in case of IOMMU mappings
    > > at some point, even if today's hardware doesn't have this combination.
    > > It would be good to use the same solution for both.
    > I don't think I follow. What does IOMMU has to do with CMA?

    The point is that on the higher level device drivers, we want to
    hide the presence of CMA and/or IOMMU behind the dma mapping API,
    but the device drivers do need to know about the bank properties.

    If we want to solve the problem of allocating per-bank memory inside
    of CMA, we also need to solve it inside of the IOMMU code, using
    the same device driver interface.


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