Messages in this thread | | | Date | Fri, 3 Mar 2006 15:27:39 -0800 | From | Greg KH <> | Subject | Re: 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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |