Hello Bjorn, I just submitted the bug and here is the URL: https://bugzilla.kernel.org/show_bug.cgi?id=72681 Thank you, Cristina On Fri, Mar 21, 2014 at 4:34 PM, Bjorn Helgaas <bhelgaas@xxxxxxxxxx> wrote: > On Fri, Mar 21, 2014 at 2:14 PM, Cristina Olariu <colariu@xxxxxxxxx> wrote: >> Hello Bjorn, >> >> Thank you very much for your answer. >> >> You were right. I was trying to get sysfs info via pci_create_slot(). >> The PCIe slots on our platform don't support hotplug; consequently >> /sys/bus/pci/slots remains empty. >> >> For us it is important to be able to list all the devices in a physical PCI >> slot even if it doesn't implement the hotplug functionnality. >> >> I will follow your advice and open a bugzilla. > > Thanks. Please respond to this thread with the bugzilla URL. > > By the way, your email is something other than plain text, so I don't > think it made it to the linux-pci list. See > http://vger.kernel.org/majordomo-info.html > >> On Fri, Mar 21, 2014 at 2:26 PM, Bjorn Helgaas <bhelgaas@xxxxxxxxxx> wrote: >>> >>> [+cc linux-pci] >>> >>> On Fri, Mar 21, 2014 at 11:56 AM, Cristina Olariu <colariu@xxxxxxxxx> >>> wrote: >>> > Hello Bjorn, >>> > >>> > I was trying to use the pci_slot module in order to associate a network >>> > interface to its corresponding network port by matching devices with >>> > physical slot information. >>> > >>> > Unfortunately the PCIe slots on our platform don't support the hot-plug >>> > function and the pci_slot module doesn't expose the slots interface in >>> > sysfs. >>> > >>> > Is there another way to list devices by physical add-in slots? We are >>> > using >>> > kernel version 3.4.67. >>> > Any pointers you may be able to offer would be appreciated. >>> >>> I haven't paid much attention recently to the way we expose slot >>> numbers. I assume you're looking for the sysfs info that is exposed >>> via pci_create_slot(). >>> >>> The pci_slot module only puts slot info in sysfs (via >>> pci_create_slot()) when the ACPI namespace contains certain >>> information (_ADR, _SUN, etc.) If you don't support hotplug, you >>> probably wouldn't have this info in the namespace. >>> >>> It looks like the only other user of pci_create_slot() is >>> pci_hp_register(), which is called by various hotplug drivers. But >>> none of these help you either if you don't support hotplug. >>> >>> "lspci -vv" should show you the "Physical Slot Number" from the Slot >>> Capabilities register in the PCIe capability. Is that the number >>> you're looking for? That seems like something we might want to expose >>> via sysfs, but based on the places that use PCI_EXP_SLTCAP_PSN, I >>> don't see anything that would do so. (Sigh, I see that pciehp defines >>> PSN, which doesn't use PCI_EXP_SLTCAP_PSN but is extracting the same >>> field. I'll fix this.) >>> >>> In any event, I'm guessing pciehp doesn't do anything (including >>> creating the sysfs slot info) on your system because you don't support >>> hotplug. But it seems reasonable that the slot number could be useful >>> even without hotplug, so maybe this functionality should be moved out >>> of pciehp somehow. >>> >>> Could you open a bugzilla at http://bugzilla.kernel.org and attach a >>> complete dmesg log (with pciehp and pci_slot enabled) and complete >>> "lspci -vv" info? Maybe we can figure out a nice way to do this. >>> >>> Bjorn >> >> >> >> >> -- >> CRISTINA OLARIU * Elfiq Networks * Software Developer >> T. 514.667.0611 x 821 * E. colariu@xxxxxxxxx -- CRISTINA OLARIU * Elfiq Networks * Software Developer T. 514.667.0611 x 821 * E. colariu@xxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
