tree d855a7bc7df8f3e84f1d267e060537ec011477c6
parent bee415ce427d1eab6cfb30221461c7d20cbf1903
author Matthew Wilcox <matthew@wil.cx> 1260709802 -0500
committer Jesse Barnes <jbarnes@virtuousgeek.org> 1266884116 -0800

PCI: Rewrite pci_scan_slot

The Alternate Routing-ID Interpretation capability allows a single device
to have up to 256 functions.  They can be populated sparsely, so the
current technique of scanning every eighth function is not guaranteed
to find them all.  By introducing a 'next_fn' function pointer, we can
use the linked list of functions in the ARI capability to scan all the
functions which exist.

We can then speed up the pci_scan_slot by skipping the scan of subsequent
devfns for PCIe devices which are the direct children of Root Ports or
Downstream Ports.  These devices are only permitted to implement device
0, unless they are ARI devices, in which case they'll be scanned by the
ARI code above.

Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>