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perf intel-pt: Fix CYC timestamps after standalone CBR

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commit 430635a0ef1ce958b7b4311f172694ece2c692b8 upstream.

After a standalone CBR (not associated with TSC), update the cycles
reference timestamp and reset the cycle count, so that CYC timestamps
are calculated relative to that point with the new frequency.

Fixes: cc33618619cefc6d ("perf tools: Add Intel PT support for decoding CYC packets")
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20230403154831.8651-2-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Adrian Hunter 2023-04-03 18:48:31 +03:00 committed by Greg Kroah-Hartman
parent 905f847675
commit a25a403e4b
1 changed files with 2 additions and 0 deletions
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2
tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
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@ -1639,6 +1639,8 @@ static void intel_pt_calc_cbr(struct intel_pt_decoder *decoder)
decoder->cbr = cbr;
decoder->cbr_cyc_to_tsc = decoder->max_non_turbo_ratio_fp / cbr;
decoder->cyc_ref_timestamp = decoder->timestamp;
decoder->cycle_cnt = 0;
intel_pt_mtc_cyc_cnt_cbr(decoder);
}