Why I can't find the performance monitoring event for all Instructions count? How to get instructions event for my ARMV7 Cortex-A9 by PMU?

Thank you. I tried and when I use the SWINCR(in armv7 cortex-a9 is number 0x00  event) to collect information ,I only get 0 every time I read the counter in my experiment,but the other counter event works well,like data cache miss,instruction cache miss...,why?

Thank you. I tried and when I use the SWINCR(in armv7 cortex-a9 is number 0x00  event) to collect information ,I only get 0 every time I read the counter in my experiment,but the other counter event works well,like data cache miss,instruction cache miss...,why?

What kind of target are you using?

The Fast Models don't fully model the PMU, and most of the events aren't functional.  Meaning that you get counts of zero.

I am using for collecting CPIs. How to read the counter event "SWINCR" ,is there any different with other counter events? And the Armv7 manual says that "PMSWINC is a write-only register
".Dose it mean that I can't read it?