[linux-usb-devel] Re: SLAB vs. pci_alloc_xxx in usb-uhci patch [RFC: API]

[Pete Zaitcev]

> Date: Fri, 09 Mar 2001 10:29:22 -0800
> From: David Brownell <[EMAIL PROTECTED]>

> > > 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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