Re: The IO problem on multiple PCI busses

Chris Wedgwood
2001-03-05T23:21:29Z

On Thu, Mar 01, 2001 at 11:09:00AM -0800, David S. Miller wrote:

I think a cleaner scheme is to allow mmap() on
/proc/bus/pci/${BUS}/${DEVICE} nodes, that is much cleaner and solves
transparently any "different word size between userland and kernel"
issues (specifically 32-bit userlands executing on 64-bit
kernels).

This works great for when you want to do IO cycles from userland; but
what about the case of hardware which requires IO cycles from a
device driver for some very non-video hardware that may support
multiple cards across multiple busses?

Or do I not understand?

--cw