[Draft] [SPE] Add jitter to SPE functionality

[PrzemekWirkus]

Description

** This is work in progress **

In this patch I'm introducing jitter to SPE configuration. Below two new arm_+spe_0

• jitter=1 - use jitter to avoid resonance when sampling (PMSIRR.RND).
• period=<n> - The sample period is set in Linux perf from the -c option. We will pass it to SPE configuration as new filter period=<n> as -c is taken in wperf CLI for other setting.
  • Because the minimum interval is used by default it’s recommended to set this to a higher value. The value is written to PMSIRR.INTERVAL.
• added isb() after every sysreg write to make sure change propagates.

Testing

This patch is causing below issue in WindowsPerf, and needs further investigation.

>wperf record -e arm_spe_0/ld=1/ -c 7 --timeout 10 -- cpython\PCbuild\arm64\python_d.exe -c 10**10**100
...
runtime delta: 0x7ff69a700000
sampling ...error: DeviceIoControl failed: GetLastError=ea
PMU_CTL_SPE_GET_BUFFER failed