| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.15 076/171] perf intel-pt: Fix some PGE (packet generation enable/control flow packets) usage | Date | Mon, 13 Dec 2021 10:29:51 +0100 |
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From: Adrian Hunter <adrian.hunter@intel.com>
commit 057ae59f5a1d924511beb1b09f395bdb316cfd03 upstream.
Packet generation enable (PGE) refers to whether control flow (COFI) packets are being produced.
PGE may be false even when branch-tracing is enabled, due to being out-of-context, or outside a filter address range. Fix some missing PGE usage.
Fixes: 7c1b16ba0e26e6 ("perf intel-pt: Add support for decoding FUP/TIP only") Fixes: 839598176b0554 ("perf intel-pt: Allow decoding with branch tracing disabled") 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/20211210162303.2288710-2-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- tools/perf/util/intel-pt-decoder/intel-pt-decoder.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
--- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c +++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c @@ -2677,6 +2677,7 @@ static int intel_pt_hop_trace(struct int return HOP_IGNORE; case INTEL_PT_TIP_PGD: + decoder->pge = false; if (!decoder->packet.count) { intel_pt_set_nr(decoder); return HOP_IGNORE; @@ -2706,7 +2707,7 @@ static int intel_pt_hop_trace(struct int intel_pt_set_ip(decoder); if (intel_pt_fup_event(decoder)) return HOP_RETURN; - if (!decoder->branch_enable) + if (!decoder->branch_enable || !decoder->pge) *no_tip = true; if (*no_tip) { decoder->state.type = INTEL_PT_INSTRUCTION; @@ -2896,7 +2897,7 @@ static bool intel_pt_psb_with_fup(struct { struct intel_pt_psb_info data = { .fup = false }; - if (!decoder->branch_enable || !decoder->pge) + if (!decoder->branch_enable) return false; intel_pt_pkt_lookahead(decoder, intel_pt_psb_lookahead_cb, &data); @@ -2998,7 +2999,7 @@ next: break; } intel_pt_set_last_ip(decoder); - if (!decoder->branch_enable) { + if (!decoder->branch_enable || !decoder->pge) { decoder->ip = decoder->last_ip; if (intel_pt_fup_event(decoder)) return 0;
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