Messages in this thread | | | Date | Fri, 9 Mar 2001 14:14:42 -0500 | From | Pete Zaitcev <> | Subject | Re: SLAB vs. pci_alloc_xxx in usb-uhci patch [RFC: API] |
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> 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.
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