[CCing the regression list, as it should be in the loop for regressions: https://docs.kernel.org/admin-guide/reporting-regressions.html] [TLDR: I'm adding this report to the list of tracked Linux kernel regressions; the text you find below is based on a few templates paragraphs you might have encountered already in similar form. See link in footer if these mails annoy you.] On 03.07.23 12:37, Gwan-gyeong Mun wrote: > > Since Linux 6.2 kernel (same happens in Linux 6.4.1), loading vfio-pci > driver to a specific HW (Intel DG2 A770) target does not work properly. > (It works fine on Linux 6.1 kernel with the same HW). > > The configuration and hardware information used is described in [1]. > > Starting with the Linux 6.2 kernel, the following log is output to dmesg > when a problem occurs. > ... > [ 15.049948] pcieport 0000:00:01.0: Data Link Layer Link Active not set > in 1000 msec > [ 15.050024] pcieport 0000:01:00.0: Unable to change power state from > D3cold to D0, device inaccessible > [ 15.051067] pcieport 0000:02:01.0: Unable to change power state from > D3cold to D0, device inaccessible > [ 15.052141] pcieport 0000:02:04.0: Unable to change power state from > D3cold to D0, device inaccessible > [ 17.286554] vfio-pci 0000:03:00.0: not ready 1023ms after resume; > giving up > [ 17.286553] vfio-pci 0000:04:00.0: not ready 1023ms after resume; > giving up > [ 17.286576] vfio-pci 0000:03:00.0: Unable to change power state from > D3cold to D0, device inaccessible > [ 17.286578] vfio-pci 0000:04:00.0: Unable to change power state from > D3cold to D0, device inaccessible > ... > > And if you check the DG2 hardware using the "lspci -nnv" command, you > will see that "Flags:" is displayed as "!!! Unknown header type 7f" as > shown below. [2] > The normal output log looks like [3]. > > This issue has been occurring since the patch below was applied. [4] > > d8d2b65a940bb497749d66bdab59b530901d3854 is the first bad commit > commit d8d2b65a940bb497749d66bdab59b530901d3854 > Author: Bjorn Helgaas <bhelgaas@xxxxxxxxxx> > Date: Fri Dec 9 11:01:00 2022 -0600 > > PCI/portdrv: Allow AER service only for Root Ports & RCECs > > > Rolling back the [4] patch makes it work on boot with the latest version > of the kernel, but the same problem still occurs after "suspend to s2idle". > This problem existed even before applying [4]. > [...] Thanks for the report. To be sure the issue doesn't fall through the cracks unnoticed, I'm adding it to regzbot, the Linux kernel regression tracking bot: #regzbot ^introduced d8d2b65a940bb4 #regzbot title PCI/portdrv: vfio-pci driver fails to work with Intel DG2 (A770) discrete graphics #regzbot ignore-activity This isn't a regression? This issue or a fix for it are already discussed somewhere else? It was fixed already? You want to clarify when the regression started to happen? Or point out I got the title or something else totally wrong? Then just reply and tell me -- ideally while also telling regzbot about it, as explained by the page listed in the footer of this mail. Developers: When fixing the issue, remember to add 'Link:' tags pointing to the report (the parent of this mail). See page linked in footer for details. Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat) -- Everything you wanna know about Linux kernel regression tracking: https://linux-regtracking.leemhuis.info/about/#tldr That page also explains what to do if mails like this annoy you.
