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FromKumar Gala <>
SubjectRe: proper way to assign fixed PCI resources to a "hotplug" device
DateFri, 3 Mar 2006 17:13:55 -0600

On Mar 3, 2006, at 4:07 PM, Greg KH wrote:

> On Fri, Mar 03, 2006 at 11:42:03AM -0600, Kumar Gala wrote:
>> 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.
>
> Idealy your BIOS would set up this information :)
>
>> 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.
>
> Take a look at how the compat pci hotplug driver does this, you
> probably
> just need to do the same as it.

I found cpqhp_configure_device(), but I dont see anything about how
to handle assigned a fixed address to the BAR.

I see I could use pci_find_slot()/pci_scan_slot(). Not sure I see
how that is much better than pci_find_bus()/pci_scan_single_device().

- kumar
-
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