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 -- 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
