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| SvenKieske | Hi there, maybe a n00b question, but can it be the case that the 5.4 HWE Kernel on ubuntu 18.04 does neither contain buildin pci hotplug, nor a loadable module for it? it should be "modprobe pciehp" from what I've read so far, but no chance. it is also not builtin, from what I've checked. | 15:59 |
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| SvenKieske | any hints are appreciated | 16:00 |
| SvenKieske | or "acpiphp", which is also not present? | 16:01 |
| SvenKieske | what I ultimately want to achieve is NVME hotplug, but I figured I therefore need "acpihp" and/or "pciehp". I can't find those in the builtin modules list, or anywhere under /lib/modules/; also not in the blacklist for modprobe. this is really weird, maybe I'm doing something wrong? | 16:05 |
| SvenKieske | I reopened my bugreport regarding this with some more information, if someone could take a look at a later date, that would be awesome: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1998224 | 16:13 |
| -ubottu:#ubuntu-kernel- Launchpad bug 1998224 in linux (Ubuntu) "pcie hotplug not working in linux-generic-hwe-18.04 5.4.0.107.121~18" [Undecided, New] | 16:13 | |
| juergh[m] | SvenKieske: https://kernel.ubuntu.com/~kernel-ppa/config/bionic/linux-hwe-5.4/5.4.0-139.156~18.04.1/amd64-config.flavour.generic... (full message at <https://libera.ems.host/_matrix/media/v3/download/libera.chat/766fb363a0ff23340154a426222f9ca810208eae>) | 16:18 |
| juergh[m] | all built-in | 16:18 |
| juergh[m] | Also check /lib/modules/$(uname -r)/modules.builtin | 16:21 |
| SvenKieske | that's where I checked..weird (/lib/modules/$(uname -r )/modules.builtin).thanks! | 16:22 |
| SvenKieske | grep -i pci /lib/modules/$(uname -r )/modules.builtin has no hotplug output: https://paste.opendev.org/show/b1uNAcGFmumVEKz9xuAe/ | 16:24 |
| SvenKieske | another noob question: is the kernel ppa the canonical (pun somewhat intended) source for the HWE Kernel? | 16:25 |
| juergh[m] | no. the archive or launchpad git for the source. | 16:37 |
| juergh[m] | hmm. there is indeed something weird going on. | 16:41 |
| juergh[m] | on focal: | 16:41 |
| juergh[m] | ubuntu@ubuntu-focal:~$ uname -r... (full message at <https://libera.ems.host/_matrix/media/v3/download/libera.chat/81ef4101f78f6a7fd76bd1dc226e9e41c63bfb1d>) | 16:41 |
| juergh[m] | on bionic: | 16:42 |
| juergh[m] | ubuntu@ubuntu-bionic:/lib/modules$ uname -r | 16:42 |
| juergh[m] | 5.4.0-132-generic | 16:42 |
| juergh[m] | ubuntu@ubuntu-bionic:/lib/modules$ modinfo pciehp | 16:42 |
| juergh[m] | modinfo: ERROR: Module pciehp not found. | 16:42 |
| juergh[m] | same for acpiphp. but the module is loaded so it seems that module.builtin is wrong. | 16:43 |
| SvenKieske | I downloaded: de.archive.ubuntu.com/ubuntu/pool/main/l/linux-hwe-5.4/linux-modules-extra-5.4.0-137-generic_5.4.0-137.154~18.04.1_amd64.deb and it has in /lib/modules/..../drivers/pci/hotplug/ 3 .ko files: acpiphp_ibm.ko (dunno about the ibm postfix), cpcihp_generic.ko and cpcihp_zt5550.ko | 16:43 |
| juergh[m] | dmesg | grep acpiphp | 16:43 |
| SvenKieske | yeah, dmesg seems to agree that acpiphp is loaded, I suppose it's coming from acpiphp_ibm.ko | 16:44 |
| juergh[m] | no. its acpiphp. bulilt-in. | 16:44 |
| SvenKieske | I'm not sure if pciehp is needed as well. I found not much docs on this stuff at docs.kernel.org, or I searched with the wrong terms. | 16:44 |
| SvenKieske | afaik pciehp is shorthand for pci express hotplug; so I suppose I need that as well, for nvme hotplug | 16:45 |
| juergh[m] | I think it depends on the motherboard. whether native PCIe or ACPI hotplugging is supported. | 16:48 |
| juergh[m] | do you have any hotplug related settings in your BIOS? | 16:49 |
| SvenKieske | not that I remember, can't check atm, it's getting late today and I need to restore service. this is a ceph storage node and I don't want to have an extended downtime in that cluster | 17:14 |
| SvenKieske | I really need a test server for this kind of stuff | 17:15 |
| SvenKieske | thanks so far! | 17:15 |
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