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    SubjectRe: proper way to assign fixed PCI resources to a "hotplug" device
    On Fri, Mar 03, 2006 at 05:13:55PM -0600, Kumar Gala wrote:
    >
    > 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 don't know either, try asking on the pci hotplug mailing list and CC:
    Scott, the author of that driver for how his devices work around that.

    thanks,

    greg k-h
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