4.4-stable review patch. If anyone has any objections, please let me know.
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From: Adrian Hunter adrian.hunter@intel.com
commit 9fb523363f6e3984457fee95bb7019395384ffa7 upstream.
Some Atom CPUs can produce FUP packets that contain NLIP (next linear instruction pointer) instead of CLIP (current linear instruction pointer). That will result in "Unexpected indirect branch" errors. Fix by comparing IP to NLIP in that case.
Signed-off-by: Adrian Hunter adrian.hunter@intel.com Cc: stable@vger.kernel.org Link: http://lkml.kernel.org/r/1527762225-26024-5-git-send-email-adrian.hunter@int... 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 | 17 +++++++++++++++-- tools/perf/util/intel-pt-decoder/intel-pt-decoder.h | 9 +++++++++ tools/perf/util/intel-pt.c | 4 ++++ 3 files changed, 28 insertions(+), 2 deletions(-)
--- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c +++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c @@ -111,6 +111,7 @@ struct intel_pt_decoder { bool have_cyc; bool fixup_last_mtc; bool have_last_ip; + enum intel_pt_param_flags flags; uint64_t pos; uint64_t last_ip; uint64_t ip; @@ -213,6 +214,8 @@ struct intel_pt_decoder *intel_pt_decode decoder->data = params->data; decoder->return_compression = params->return_compression;
+ decoder->flags = params->flags; + decoder->period = params->period; decoder->period_type = params->period_type;
@@ -1010,6 +1013,15 @@ out_no_progress: return err; }
+static inline bool intel_pt_fup_with_nlip(struct intel_pt_decoder *decoder, + struct intel_pt_insn *intel_pt_insn, + uint64_t ip, int err) +{ + return decoder->flags & INTEL_PT_FUP_WITH_NLIP && !err && + intel_pt_insn->branch == INTEL_PT_BR_INDIRECT && + ip == decoder->ip + intel_pt_insn->length; +} + static int intel_pt_walk_fup(struct intel_pt_decoder *decoder) { struct intel_pt_insn intel_pt_insn; @@ -1022,7 +1034,8 @@ static int intel_pt_walk_fup(struct inte err = intel_pt_walk_insn(decoder, &intel_pt_insn, ip); if (err == INTEL_PT_RETURN) return 0; - if (err == -EAGAIN) { + if (err == -EAGAIN || + intel_pt_fup_with_nlip(decoder, &intel_pt_insn, ip, err)) { if (decoder->set_fup_tx_flags) { decoder->set_fup_tx_flags = false; decoder->tx_flags = decoder->fup_tx_flags; @@ -1032,7 +1045,7 @@ static int intel_pt_walk_fup(struct inte decoder->state.flags = decoder->fup_tx_flags; return 0; } - return err; + return -EAGAIN; } decoder->set_fup_tx_flags = false; if (err) --- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.h +++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.h @@ -53,6 +53,14 @@ enum { INTEL_PT_ERR_MAX, };
+enum intel_pt_param_flags { + /* + * FUP packet can contain next linear instruction pointer instead of + * current linear instruction pointer. + */ + INTEL_PT_FUP_WITH_NLIP = 1 << 0, +}; + struct intel_pt_state { enum intel_pt_sample_type type; int err; @@ -91,6 +99,7 @@ struct intel_pt_params { unsigned int mtc_period; uint32_t tsc_ctc_ratio_n; uint32_t tsc_ctc_ratio_d; + enum intel_pt_param_flags flags; };
struct intel_pt_decoder; --- a/tools/perf/util/intel-pt.c +++ b/tools/perf/util/intel-pt.c @@ -676,6 +676,7 @@ static struct intel_pt_queue *intel_pt_a unsigned int queue_nr) { struct intel_pt_params params = { .get_trace = 0, }; + struct perf_env *env = pt->machine->env; struct intel_pt_queue *ptq;
ptq = zalloc(sizeof(struct intel_pt_queue)); @@ -753,6 +754,9 @@ static struct intel_pt_queue *intel_pt_a } }
+ if (env->cpuid && !strncmp(env->cpuid, "GenuineIntel,6,92,", 18)) + params.flags |= INTEL_PT_FUP_WITH_NLIP; + ptq->decoder = intel_pt_decoder_new(¶ms); if (!ptq->decoder) goto out_free;