For devices, the support is already there. See Documentation/pci.txt.
Look for 'probe', 'id_table', etc.
I don't think there is support in the current tree for a controller that
supports physical hotplugging of PCI adapters, yet. Compaq has a driver
outside the tree to do such a thing (needing only very minor kernel
patches), see http://opensource.compaq.com
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