Is there any concept of PCI domains in the kernel?
This is for the DRM, while dealing with a complaint from Linus recently:
Please fix the fact that modern PCI is _not_ enumerated with just "bus,
slot, function". A lot of machines are starting to have a "domain number", which allows fro multiple independent PCI subsystems in the same machine.
On linux, you can use "pci_name(pdev)" to get a truly unique descriptor of the device (within the PCI subsystem). It will look something like
0000:00:02.0
for "domain 0, bus 0, device 2, function 0".
We don't have much of a concept of this (except possibly Alpha like John mentioned, but I really cannot comment on that). Supporting it wouldn't be terribly magical on our end until we fix busdma to support device-device transfers. Since I don't know much context on the DRM side, what exactly is Linus asking to change, and do we need to worry about it?
Scott
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