what is the rule for creating the raw encoding of a perfmon event with 2 event selectors

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what is the rule for creating the raw encoding of a perfmon event with 2 event selectors

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I have a sapphire rapids server. I'm interested is monitoring the perfmon event OCR.HWPF_L1D.ANY_RESPONSE. The associated information is

EventSel={2AH,2BH} UMask=01H MSR_OFFCORE_RSPx{1A6H,1A7H}=10400H

If this had 1 event selector the raw encoding would be "r", followed by the Umask followed by the EventSelector. But this event shows 2 event selectors, {2AH,2BH}. perf doesn't recognize OCR.HWPF_L1D.ANY_RESPONSE as a valid event, as seen below:

perf stat -e OCR.HWPF_L1D.ANY_RESPONSE sleep 1

event syntax error: 'OCR.HWPF_L1D.ANY_RESPONSE'

\___ parser error

Run 'perf list' for a list of valid events

Thus I need the raw encoding. What would it be?

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