Messages in this thread |  | | | From | Kumar Gala <> | | Subject | Re: proper way to assign fixed PCI resources to a "hotplug" device | | Date | Fri, 3 Mar 2006 17:13:55 -0600 |
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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().
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