proper way to assign fixed PCI resources to a "hotplug" device

[Kumar Gala <galak@kernel.crashing.org>]

I was wondering what the proper way to assign and setup a single PCI  
device that comes into existence after the system has booted.  I have  
an FPGA that we load from user space at which time it shows up on the  
PCI bus.

It has a single BAR and I need to assign it at a fixed address in PCI  
MMIO space.

All of the exported interfaces I see have to do with having the  
kernel assign the BAR automatically for me.

the following looks like what I want to do:

bus = pci_find_bus(0, 3);
dev = pci_scan_single_device(bus, devfn);
pci_bus_alloc_resource(...);
pci_update_resource(dev, dev->resource[0], 0);
pci_bus_add_devices(bus);

However, pci_update_resource() is not an exported symbol, so I could  
replace that code with the need updates to the actual BAR.

Is this the "right" way to go about this or is there a better  
mechanism to do this.

thanks

- kumar

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