** Description changed:
- Fix wrong output of lscpumf when device cpum_cf has different type than
- 4
+ [Impact]
+ * lscpumf -c displays the raw counter number incorrectly
+ * It is always displayed as rXXX (XXX being hex)
+ * If PMU measurement facility device driver has been registered with a
different type than PERF_TYPE_RAW(4) this is incorrect
+ * It should be displayed as <type>:DDD (DDD being decimal)
+ * Backported the fix to the legacy lscpumc perl tool. Newer version have
converted this tool to C.
+
+ [Test Case]
+ * run lscpumf -c on IBM Z / s390x
+ * verify output is 'rXXX' (XXX being hex) if type = PERF_TYPE_RAW(4)
+ * verify output is '<type>:DDD' (DDD being decimal) if type !=
PERF_TYPE_RAW(4)
+
+ To find out with PMU type number has been assigned to
+ the PMU Measurement facility device driver, type command
+ cat /sys/devices/cpum_cf/type (for counters)
+ cat /sys/devices/cpum_cf/type (for sampling)
+
+ [Regression Potential]
+ * regressions in lscpumf could break the visualization of CPU-measurement
facilities on IBM Z
+ * the package is only available on s390x and thus could only affect IBM Z
machines
+
+ [Other Info]
+ * Needs to be tested/verified by IBM internally
+ * Patch was provided by IBM
+ * Related to LP: #1888231 and LP: #1892350
+ * This patch is caused by upstream kernel commits: commit 6a82e23f45fe
("s390/cpumf: Adjust registration of s390 PMU device drivers") commit
66d258c5b048 ("perf/core: Optimize perf_init_event()")
+ * Also fix the rename of counter CCERROR to CCFINISH caused by upstream
kernel commit: commit 3d3af181d370 ("s390/cpum_cf,perf: change DFLT_CCERROR
counter name")
+
+ === Original Description ===
+ Fix wrong output of lscpumf when device cpum_cf has different type than 4
Please apply to ubuntu 20.04 (s390-tools version 2.12)
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https://bugs.launchpad.net/bugs/1893027
Title:
[UBUNTU 20.04] lscpumf display raw event number incorrectly
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