Messages in this thread | | | From | "David S. Miller" <> | Date | Thu, 1 Mar 2001 11:09:00 -0800 (PST) | Subject | Re: The IO problem on multiple PCI busses |
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Benjamin Herrenschmidt writes: > I'm, of course open to any comments about this (in fact, I'd really like > some feedback). One thing is that we also need to find a way to pass > those infos to userland. Currently, we implement an arch-specific syscall > that allow to retreive the IO physical base of a given PCI bus. That may > be enough, but we may also want something that match more closely what we > do in the kernel.
Same problem on sparc64. Using a special PCI syscall is fine, _if_ we all end up using the same one. However, I would prefer another mechanism...
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).
I played around with something akin to this, and some of the necessary Xfree86-4.0.x hackery needed, some time ago. But I never finished this.
Later, David S. Miller davem@redhat.com
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