** Changed in: linux (Ubuntu Jammy) Importance: High => Medium ** Changed in: linux (Ubuntu Impish) Importance: Undecided => Medium
** Changed in: linux (Ubuntu Focal) Importance: Undecided => Medium -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1960182 Title: [UBUNTU 20.04] kernel: Add support for CPU-MF counter second version 7 Status in Ubuntu on IBM z Systems: In Progress Status in linux package in Ubuntu: In Progress Status in linux source package in Focal: In Progress Status in linux source package in Impish: In Progress Status in linux source package in Jammy: In Progress Bug description: Fix CPU-MF error on new IBM Z Hardware by adding support for CPU-MF counter second version 7 Error Symptom: Daemon cpacfstatsd fails on start up of the system with this error message cpacfstatsd: Event DEA_FUNCTIONS for pmu cpum_cf not found (2:No such file or directory) Problem: When the CPU Measurement facility device driver is initialized during kernel boot, it reads out the CPU Measurement facility counter hardware first and second version numbers. Depending on these numbers the device driver exports attributes in the sysfs directory /sys/devices/cpum_cf/events. When the CPM-MF second version number is not known, no attributes of the crypto counter set are exported. However the cpacfstatsd program scans the sysfs directory /sys/devices/cpum_cf/events for attribute files of the crypto counter set, for example attribute file DEA_FUNCTIONS and others. Solution: Add support for the new CPU-MF Measurement counter facility second version number 7. This number then exports the crypto counter set in directory directory /sys/devices/cpum_cf/events. Also add support for limited samples. These hardware samples contain all zeroes and are of no value when using the CPU Measurement Facility sampling hardware. Drop these samples when the limited sampled bit is set in the sample descriptor. Reproduction: Run command ls -l /sys/devices/cpum_cf/events | fgrep DEA DEA_BLOCKED_CYCLES DEA_BLOCKED_FUNCTIONS DEA_CYCLES DEA_FUNCTIONS When there is no output at all the attributes files for the crypto counter set have not been exported. If above output is visible, the described problem does not show up. Upstream-ID: a87b0fd4f9003f8521226e226cf92b18147b3519 745f5d20e7936931f924410f32d8b0e599b5990e Problem-ID: 196017 Preventive: yes Reported: Christian Rund <christian.r...@de.ibm.com> SupportTicket: - Reference: - Date: 2022-01-20 Author: Thomas Richter <tmri...@linux.ibm.com> Component: kernel To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1960182/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
