linux-kernel - [PATCH 14/37] perf intel-pt: Add decoder support for CBR events

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Date:   Fri, 19 May 2017 11:54:13 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Andi Kleen <ak@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH 14/37] perf intel-pt: Add decoder support for CBR events

Add decoder support for informing the tools of changes to the core-to-bus
ratio (CBR).

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
 tools/perf/util/intel-pt-decoder/intel-pt-decoder.c | 19 +++++++++++++++++++
 tools/perf/util/intel-pt-decoder/intel-pt-decoder.h |  2 ++
 2 files changed, 21 insertions(+)

diff --git a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
index 8062655bc112..9bb694290a28 100644
--- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
+++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c
@@ -121,6 +121,7 @@ struct intel_pt_decoder {
 	int pkt_len;
 	int last_packet_type;
 	unsigned int cbr;
+	unsigned int cbr_seen;
 	unsigned int max_non_turbo_ratio;
 	double max_non_turbo_ratio_fp;
 	double cbr_cyc_to_tsc;
@@ -147,6 +148,7 @@ struct intel_pt_decoder {
 	uint64_t fup_ptw_payload;
 	uint64_t fup_mwait_payload;
 	uint64_t fup_pwre_payload;
+	uint64_t cbr_payload;
 	uint64_t timestamp_insn_cnt;
 	uint64_t stuck_ip;
 	int no_progress;
@@ -1424,6 +1426,8 @@ static void intel_pt_calc_cbr(struct intel_pt_decoder *decoder)
 {
 	unsigned int cbr = decoder->packet.payload & 0xff;
 
+	decoder->cbr_payload = decoder->packet.payload;
+
 	if (decoder->cbr == cbr)
 		return;
 
@@ -1784,6 +1788,16 @@ static int intel_pt_walk_trace(struct intel_pt_decoder *decoder)
 
 		case INTEL_PT_CBR:
 			intel_pt_calc_cbr(decoder);
+			if (!decoder->branch_enable &&
+			    decoder->cbr != decoder->cbr_seen) {
+				decoder->cbr_seen = decoder->cbr;
+				decoder->state.type = INTEL_PT_CBR_CHG;
+				decoder->state.from_ip = decoder->ip;
+				decoder->state.to_ip = 0;
+				decoder->state.cbr_payload =
+							decoder->packet.payload;
+				return 0;
+			}
 			break;
 
 		case INTEL_PT_MODE_EXEC:
@@ -2324,6 +2338,11 @@ const struct intel_pt_state *intel_pt_decode(struct intel_pt_decoder *decoder)
 		decoder->state.from_ip = decoder->ip;
 	} else {
 		decoder->state.err = 0;
+		if (decoder->cbr != decoder->cbr_seen && decoder->state.type) {
+			decoder->cbr_seen = decoder->cbr;
+			decoder->state.type |= INTEL_PT_CBR_CHG;
+			decoder->state.cbr_payload = decoder->cbr_payload;
+		}
 	}
 
 	return &decoder->state;
diff --git a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.h b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.h
index 414c88e9e0da..921b22e8ca0e 100644
--- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.h
+++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.h
@@ -36,6 +36,7 @@ enum intel_pt_sample_type {
 	INTEL_PT_PWR_ENTRY	= 1 << 5,
 	INTEL_PT_EX_STOP	= 1 << 6,
 	INTEL_PT_PWR_EXIT	= 1 << 7,
+	INTEL_PT_CBR_CHG	= 1 << 8,
 };
 
 enum intel_pt_period_type {
@@ -73,6 +74,7 @@ struct intel_pt_state {
 	uint64_t mwait_payload;
 	uint64_t pwre_payload;
 	uint64_t pwrx_payload;
+	uint64_t cbr_payload;
 	uint32_t flags;
 	enum intel_pt_insn_op insn_op;
 	int insn_len;
-- 
1.9.1