Hi Jianhui,
Thanks for letting us know, I can reproduce this issue in IoT Yocto's
rity-demo-image on Genio 1200 EVK:
```
root@genio-1200-evk:~# sudo taskset -c 7 perf stat -e
armv8_cortex_a55/cpu_cycles/ -e armv8_cortex_a78/cpu_cycles/ -e cycles stress
-c 7 --timeout 1s
stress-ng: info: [3843] setting to a 1 second run per stressor
stress-ng: info: [3843] dispatching hogs: 7 cpu
stress-ng: info: [3843] successful run completed in 1.16s
Performance counter stats for 'stress -c 7 --timeout 1s':
<not counted> armv8_cortex_a55/cpu_cycles/
(0.00%)
2480555362 armv8_cortex_a78/cpu_cycles/
<not counted> cycles
(0.00%)
1.168242000 seconds time elapsed
1.154762000 seconds user
0.011472000 seconds sys
```
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https://bugs.launchpad.net/bugs/2060063
Title:
PMU counters for Cortex-A78 not working correctly
Status in linux-mtk package in Ubuntu:
In Progress
Status in linux-mtk source package in Jammy:
In Progress
Bug description:
I am seeing an issue with the Cortex-A78 PMU counters on the
Genio1200-evk.
Linux perf reports <not counted> for Cortex-A78 PMUs when I run the following
commands:
taskset -c 7 perf stat -e cycles sleep 5
taskset -c 7 perf stat -r r11 sleep 5
Infact none of the standard PMU events on the Cortex-A78 work when
using the raw PMU event register values such as:
-e r08
-e r11
-e r13
:
...... etc.
I also see this behaviour when an application using libpfm4 OR
perf_event_open() API is pinned to one of the 4xCortex-A78 on the
board.
When I run the above perf commands and applications pinned to the
Cortex-A55 cores the PMU events get reported correctly.
Please let me know if you need more details.
Kind regards,
Umair
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