perf/x86/intel: Fix ICL/SPR INST_RETIRED.PREC_DIST encodings

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This patch fixes the encoding for INST_RETIRED.PREC_DIST as published by Intel
(download.01.org/perfmon/) for Icelake. The official encoding
is event code 0x00 umask 0x1, a change from Skylake where it was code 0xc0
umask 0x1.

With this patch applied it is possible to run:
$ perf record -a -e cpu/event=0x00,umask=0x1/pp .....

Whereas before this would fail.

To avoid problems with tools which may use the old code, we maintain the old
encoding for Icelake.

Signed-off-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20211014001214.2680534-1-eranian@google.com

...

This commit is contained in:

Stephane Eranian 2021-10-13 17:12:14 -07:00 • committed by Peter Zijlstra

parent 26da4abfb3

commit 2de71ee153

2 changed files with 6 additions and 4 deletions

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5

arch/x86/events/intel/core.c

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5

arch/x86/events/intel/ds.c

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