** Changed in: linux-bluefield (Ubuntu Jammy)
Status: New => Fix Committed
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https://bugs.launchpad.net/bugs/1989172
Title:
mlxbf-pmc: error when reading unprogrammed events
Status in linux-bluefield package in Ubuntu:
Invalid
Status in linux-bluefield source package in Focal:
Fix Committed
Status in linux-bluefield source package in Jammy:
Fix Committed
Bug description:
SRU Justification:
[Impact]
When the counters are not programmed to monitor any events, reading the
"event<n>" file results in the following error:
cat: /sys/class/hwmon/hwmon0/smmu0/event0: Invalid argument
This is misleading and instead needs to indicate that the counter is
currently not enabled.
[Fix]
* First, skip the check for whether the counter is enabled when reading the
event info. If the counter is not enabled, it should return 0, which is the
default value when coming out of reset.
* 0 is not a valid event in most blocks as per the respective event lists, so
add a "Disable" event to all the event lists.
[Test Case]
Without the fix, reading any "event" file right after reset when the counters
are not programmed should result in the following error:
cat: /sys/class/hwmon/hwmon0/smmu0/event0: Invalid argumen
With the fix, it should instead print:
0x0: DISABLE
[Regression Potential]
Can be considered minimal
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