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perf intel-pt: Fix sync state when a PSB (synchronization) packet is found

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commit ad106a26aef3a95ac7ca88d033b431661ba346ce upstream.

When syncing, it may be that branch packet generation is not enabled at
that point, in which case there will not immediately be a control-flow
packet, so some packets before a control flow packet turns up, get
ignored.  However, the decoder is in sync as soon as a PSB is found, so
the state should be set accordingly.

Fixes: f4aa081949 ("perf tools: Add Intel PT decoder")
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: stable@vger.kernel.org # v5.15+
Link: https://lore.kernel.org/r/20211210162303.2288710-3-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
[Adrian: Backport to v5.10]
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Adrian Hunter
2021-12-13 17:45:43 +02:00
committed by Greg Kroah-Hartman
parent 731ff78841
commit 3bb7fd4be8
1 changed files with 1 additions and 1 deletions
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2
tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
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@@ -2733,7 +2733,7 @@ leap:
return err;
decoder->have_last_ip = true;
decoder->pkt_state = INTEL_PT_STATE_NO_IP;
decoder->pkt_state = INTEL_PT_STATE_IN_SYNC;
err = intel_pt_walk_psb(decoder);
if (err)