linux-kernel - [PATCH 1/3] perf tools: Add configuration for ETMv3 trace protocol

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Date:   Fri, 16 Nov 2018 11:42:30 -0700
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     acme@...nel.org
Cc:     peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
        namhyung@...nel.org, coresight@...ts.linaro.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] perf tools: Add configuration for ETMv3 trace protocol

This patch deals with the proper initialisation of configuration parameters
for the ETMv3 trace protocol in order to properly handle packets generated
by tracers following this specification.

Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
---
 tools/perf/util/cs-etm-decoder/cs-etm-decoder.h |  8 ++++
 tools/perf/util/cs-etm.c                        | 54 ++++++++++++++++++-------
 2 files changed, 48 insertions(+), 14 deletions(-)

diff --git a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.h b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.h
index 612b5755f742..c0c67c919093 100644
--- a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.h
+++ b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.h
@@ -43,6 +43,13 @@ struct cs_etm_queue;
 typedef u32 (*cs_etm_mem_cb_type)(struct cs_etm_queue *, u64,
 				  size_t, u8 *);
 
+struct cs_etmv3_trace_params {
+	u32 reg_ctrl;
+	u32 reg_trc_id;
+	u32 reg_ccer;
+	u32 reg_idr;
+};
+
 struct cs_etmv4_trace_params {
 	u32 reg_idr0;
 	u32 reg_idr1;
@@ -55,6 +62,7 @@ struct cs_etmv4_trace_params {
 struct cs_etm_trace_params {
 	int protocol;
 	union {
+		struct cs_etmv3_trace_params etmv3;
 		struct cs_etmv4_trace_params etmv4;
 	};
 };
diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c
index 73430b73570d..830e9136ad7c 100644
--- a/tools/perf/util/cs-etm.c
+++ b/tools/perf/util/cs-etm.c
@@ -122,15 +122,28 @@ static void cs_etm__dump_event(struct cs_etm_auxtrace *etm,
 	/* Use metadata to fill in trace parameters for trace decoder */
 	t_params = zalloc(sizeof(*t_params) * etm->num_cpu);
 	for (i = 0; i < etm->num_cpu; i++) {
-		t_params[i].protocol = CS_ETM_PROTO_ETMV4i;
-		t_params[i].etmv4.reg_idr0 = etm->metadata[i][CS_ETMV4_TRCIDR0];
-		t_params[i].etmv4.reg_idr1 = etm->metadata[i][CS_ETMV4_TRCIDR1];
-		t_params[i].etmv4.reg_idr2 = etm->metadata[i][CS_ETMV4_TRCIDR2];
-		t_params[i].etmv4.reg_idr8 = etm->metadata[i][CS_ETMV4_TRCIDR8];
-		t_params[i].etmv4.reg_configr =
+		if (etm->metadata[i][CS_ETM_MAGIC] == __perf_cs_etmv3_magic) {
+			t_params[i].protocol = CS_ETM_PROTO_ETMV3;
+			t_params[i].etmv3.reg_ctrl =
+					etm->metadata[i][CS_ETM_ETMCR];
+			t_params[i].etmv3.reg_trc_id =
+					etm->metadata[i][CS_ETM_ETMTRACEIDR];
+		} else if (etm->metadata[i][CS_ETM_MAGIC] ==
+						      __perf_cs_etmv4_magic) {
+			t_params[i].protocol = CS_ETM_PROTO_ETMV4i;
+			t_params[i].etmv4.reg_idr0 =
+					etm->metadata[i][CS_ETMV4_TRCIDR0];
+			t_params[i].etmv4.reg_idr1 =
+					etm->metadata[i][CS_ETMV4_TRCIDR1];
+			t_params[i].etmv4.reg_idr2 =
+					etm->metadata[i][CS_ETMV4_TRCIDR2];
+			t_params[i].etmv4.reg_idr8 =
+					etm->metadata[i][CS_ETMV4_TRCIDR8];
+			t_params[i].etmv4.reg_configr =
 					etm->metadata[i][CS_ETMV4_TRCCONFIGR];
-		t_params[i].etmv4.reg_traceidr =
+			t_params[i].etmv4.reg_traceidr =
 					etm->metadata[i][CS_ETMV4_TRCTRACEIDR];
+		}
 	}
 
 	/* Set decoder parameters to simply print the trace packets */
@@ -360,15 +373,28 @@ static struct cs_etm_queue *cs_etm__alloc_queue(struct cs_etm_auxtrace *etm,
 		goto out_free;
 
 	for (i = 0; i < etm->num_cpu; i++) {
-		t_params[i].protocol = CS_ETM_PROTO_ETMV4i;
-		t_params[i].etmv4.reg_idr0 = etm->metadata[i][CS_ETMV4_TRCIDR0];
-		t_params[i].etmv4.reg_idr1 = etm->metadata[i][CS_ETMV4_TRCIDR1];
-		t_params[i].etmv4.reg_idr2 = etm->metadata[i][CS_ETMV4_TRCIDR2];
-		t_params[i].etmv4.reg_idr8 = etm->metadata[i][CS_ETMV4_TRCIDR8];
-		t_params[i].etmv4.reg_configr =
+		if (etm->metadata[i][CS_ETM_MAGIC] == __perf_cs_etmv3_magic) {
+			t_params[i].protocol = CS_ETM_PROTO_ETMV3;
+			t_params[i].etmv3.reg_ctrl =
+					etm->metadata[i][CS_ETM_ETMCR];
+			t_params[i].etmv3.reg_trc_id =
+					etm->metadata[i][CS_ETM_ETMTRACEIDR];
+		} else if (etm->metadata[i][CS_ETM_MAGIC] ==
+							__perf_cs_etmv4_magic) {
+			t_params[i].protocol = CS_ETM_PROTO_ETMV4i;
+			t_params[i].etmv4.reg_idr0 =
+					etm->metadata[i][CS_ETMV4_TRCIDR0];
+			t_params[i].etmv4.reg_idr1 =
+					etm->metadata[i][CS_ETMV4_TRCIDR1];
+			t_params[i].etmv4.reg_idr2 =
+					etm->metadata[i][CS_ETMV4_TRCIDR2];
+			t_params[i].etmv4.reg_idr8 =
+					etm->metadata[i][CS_ETMV4_TRCIDR8];
+			t_params[i].etmv4.reg_configr =
 					etm->metadata[i][CS_ETMV4_TRCCONFIGR];
-		t_params[i].etmv4.reg_traceidr =
+			t_params[i].etmv4.reg_traceidr =
 					etm->metadata[i][CS_ETMV4_TRCTRACEIDR];
+		}
 	}
 
 	/* Set decoder parameters to simply print the trace packets */
-- 
2.7.4