Messages in this thread | | | Date | Fri, 19 Mar 2004 17:09:09 +0000 | From | Matthew Wilcox <> | Subject | Re: [2/3] Use insert_resource in pci_claim_resource |
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On Fri, Mar 19, 2004 at 03:36:39PM +0000, Russell King wrote: > On Fri, Mar 19, 2004 at 02:52:12PM +0000, Matthew Wilcox wrote: > > But I do think insert_resource is the right call to make. If the device has > > the wrong resources, that means something's gone awfully wrong earlier in > > the pci code. > > Sure, but due to the request_resource semantics, it provides a good way > to catch this should it occur.
Now that I try it, we lose. ACPI allows us an unlimited number of resources that can be routed to each bus, and pci_bus only has space for 4. On my rx2600 box, we have 5 resources pointing to bus 0x20:
# cat /proc/iomem /proc/ioports |grep :20 90000000-97ffffff : PCI Bus 0000:20 ff5e0000-ff5e0007 : PCI Bus 0000:20 ff5e2000-ff5e2007 : PCI Bus 0000:20 90004000000-90103fffffe : PCI Bus 0000:20 00002000-00002fff : PCI Bus 0000:20
Sure, you can argue that some of these should be coalesced and others aren't used, but I'm not comfortable diddling with that in the kernel, or asking firmware to change that. And nobody knows what tomorrow will bring in terms of PCI bus topologies. So I'd like the insert_resource patch to go in.
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