Public bug reported: == Comment: #0 - Vaibhav Jain - 2018-04-09 05:20:18 == ---Problem Description--- Presently the Trace Data on the PSL is lost when it encounters a PERST signal. This is usually a major inconvenience during EEH debugging as PSL traces are needed to investigate the EEH cause. To fix this we enable the NORST bit by default for debug afu images to prevent reset of AFU trace-data on a PCI link drop. For production AFU images this bit is always ignored and PSL gets reconfigured anyways thereby resetting the trace data. So setting this bit for non-debug images doesn't have any impact.
Fix for this issue was merged to mainline kernel via commit: 03ebb419b896 cxl: Enable NORST bit in PSL_DEBUG register for PSL9 ---Additional Hardware Info--- Flash GT+ adapter with 180323P1 Image Machine Type = Boston-LC ---Steps to Reproduce--- 1. Enable traces on the card with psl_trace_dump tool. 2. Inject an EEH. 3. Try to dump the traces from PSL via psl_trace_dump. ---uname output--- 4.15.0-12-generic ---Debugger--- A debugger is not configured System Dump Info: The system is not configured to capture a system dump. Stack trace output: no Oops output: no ** Affects: ubuntu-power-systems Importance: High Assignee: Canonical Kernel Team (canonical-kernel-team) Status: Triaged ** Affects: linux (Ubuntu) Importance: Undecided Assignee: Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage) Status: New ** Tags: architecture-ppc64le bugnameltc-166542 severity-high targetmilestone-inin1804 triage-g ** Tags added: architecture-ppc64le bugnameltc-166542 severity-high targetmilestone-inin1804 ** Changed in: ubuntu Assignee: (unassigned) => Ubuntu on IBM Power Systems Bug Triage (ubuntu-power-triage) ** Package changed: ubuntu => linux (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1762462 Title: PSL traces reset after PERST for debug AFU image To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1762462/+subscriptions -- ubuntu-bugs mailing list email@example.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs