perf cs-etm: Refactor out ETMv4 header saving

Extract a function for saving the ETMv4 header because this will be used
for ETE in a later commit.
Reviewed-by: NLeo Yan <leo.yan@linaro.org>
Signed-off-by: NJames Clark <james.clark@arm.com>
Acked-by: NSuzuki Poulouse <suzuki.poulose@arm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: John Garry <john.garry@huawei.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Will Deacon <will@kernel.org>
Cc: coresight@lists.linaro.org
Cc: linux-arm-kernel@lists.infradead.org
Link: https //lore.kernel.org/r/20210806134109.1182235-4-james.clark@arm.com
Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/arch/arm/util/cs-etm.c

@@ -607,6 +607,28 @@ static int cs_etm_get_ro(struct perf_pmu *pmu, int cpu, const char *path)
 	return val;
 }
 
+static void cs_etm_save_etmv4_header(__u64 data[], struct auxtrace_record *itr, int cpu)
+{
+	struct cs_etm_recording *ptr = container_of(itr, struct cs_etm_recording, itr);
+	struct perf_pmu *cs_etm_pmu = ptr->cs_etm_pmu;
+
+	/* Get trace configuration register */
+	data[CS_ETMV4_TRCCONFIGR] = cs_etmv4_get_config(itr);
+	/* Get traceID from the framework */
+	data[CS_ETMV4_TRCTRACEIDR] = coresight_get_trace_id(cpu);
+	/* Get read-only information from sysFS */
+	data[CS_ETMV4_TRCIDR0] = cs_etm_get_ro(cs_etm_pmu, cpu,
+					       metadata_etmv4_ro[CS_ETMV4_TRCIDR0]);
+	data[CS_ETMV4_TRCIDR1] = cs_etm_get_ro(cs_etm_pmu, cpu,
+					       metadata_etmv4_ro[CS_ETMV4_TRCIDR1]);
+	data[CS_ETMV4_TRCIDR2] = cs_etm_get_ro(cs_etm_pmu, cpu,
+					       metadata_etmv4_ro[CS_ETMV4_TRCIDR2]);
+	data[CS_ETMV4_TRCIDR8] = cs_etm_get_ro(cs_etm_pmu, cpu,
+					       metadata_etmv4_ro[CS_ETMV4_TRCIDR8]);
+	data[CS_ETMV4_TRCAUTHSTATUS] = cs_etm_get_ro(cs_etm_pmu, cpu,
+						     metadata_etmv4_ro[CS_ETMV4_TRCAUTHSTATUS]);
+}
+
 static void cs_etm_get_metadata(int cpu, u32 *offset,
 				struct auxtrace_record *itr,
 				struct perf_record_auxtrace_info *info)
@@ -620,29 +642,7 @@ static void cs_etm_get_metadata(int cpu, u32 *offset,
 	/* first see what kind of tracer this cpu is affined to */
 	if (cs_etm_is_etmv4(itr, cpu)) {
 		magic = __perf_cs_etmv4_magic;
-		/* Get trace configuration register */
-		info->priv[*offset + CS_ETMV4_TRCCONFIGR] =
-						cs_etmv4_get_config(itr);
-		/* Get traceID from the framework */
-		info->priv[*offset + CS_ETMV4_TRCTRACEIDR] =
-						coresight_get_trace_id(cpu);
-		/* Get read-only information from sysFS */
-		info->priv[*offset + CS_ETMV4_TRCIDR0] =
-			cs_etm_get_ro(cs_etm_pmu, cpu,
-				      metadata_etmv4_ro[CS_ETMV4_TRCIDR0]);
-		info->priv[*offset + CS_ETMV4_TRCIDR1] =
-			cs_etm_get_ro(cs_etm_pmu, cpu,
-				      metadata_etmv4_ro[CS_ETMV4_TRCIDR1]);
-		info->priv[*offset + CS_ETMV4_TRCIDR2] =
-			cs_etm_get_ro(cs_etm_pmu, cpu,
-				      metadata_etmv4_ro[CS_ETMV4_TRCIDR2]);
-		info->priv[*offset + CS_ETMV4_TRCIDR8] =
-			cs_etm_get_ro(cs_etm_pmu, cpu,
-				      metadata_etmv4_ro[CS_ETMV4_TRCIDR8]);
-		info->priv[*offset + CS_ETMV4_TRCAUTHSTATUS] =
-			cs_etm_get_ro(cs_etm_pmu, cpu,
-				      metadata_etmv4_ro
-				      [CS_ETMV4_TRCAUTHSTATUS]);
+		cs_etm_save_etmv4_header(&info->priv[*offset], itr, cpu);
 
 		/* How much space was used */
 		increment = CS_ETMV4_PRIV_MAX;