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    SubjectRe: SLAB vs. pci_alloc_xxx in usb-uhci patch [RFC: API]
    > Date: Fri, 09 Mar 2001 10:29:22 -0800
    > From: David Brownell <david-b@pacbell.net>

    > > > extern void *
    > > > pci_pool_dma_to_cpu (struct pci_pool *pool, dma_addr_t handle);
    > >
    > > Do lots of drivers need the reverse mapping? It wasn't on my todo list
    > > yet.
    >
    > Some hardware (like OHCI) talks to drivers using those dma handles.

    I wonder if it may be feasible to allocate a bunch of contiguous
    pages. Then, whenever the hardware returns a bus address, subtract
    the remembered bus address of the zone start, add the offset to
    the virtual and voila.

    -- Pete
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