Consider backporting PMU support for Alder Lake

[trympet]

Is your feature request related to a problem? Please describe. There is no PMU driver for the Intel Alder Lake platform. Hardware event sampling does not work with VTune or perf.

vtune -collect hotspots -knob sampling-mode=hw -knob sampling-interval=0.5 /home/trym/source/stud/tdt4186/practical2/build/release/webserver /tmp 8889 12 24
vtune: Error: Unable to perform driverless collection on this platform.
vtune: Error: Cannot enable event-based sampling collection: Architectural Performance Monitoring version is 0. Make sure the vPMU feature is enabled in your hypervisor.

root@DESKTOP-CMKEO60:~# dmesg | grep -i pmu
[    0.177428] Performance Events: unsupported p6 CPU model 151 no PMU driver, software events only.

Describe the solution you'd like Backport the driver or provide an alternate solution.

Additional context AFAIK, the only workarounds are to use Hyper-V or dual boot.

https://www.phoronix.com/scan.php?page=news_item&px=Linux-5.13-Perf-Alder-Lake
https://lore.kernel.org/lkml/[email protected]/T/

cpuid.txt