perf cs-etm: Update record event to use new Trace ID protocol

Trace IDs are now dynamically allocated.

Previously used the static association algorithm that is no longer
used. The 'cpu * 2 + seed' was outdated and broken for systems with high
core counts (>46). as it did not scale and was broken for larger
core counts.

Trace ID will now be sent in PERF_RECORD_AUX_OUTPUT_HW_ID record.

Legacy ID algorithm renamed and retained for limited backward
compatibility use.

Reviewed-by: James Clark <james.clark@arm.com>
Signed-off-by: Mike Leach <mike.leach@linaro.org>
Acked-by: Suzuki Poulouse <suzuki.poulose@arm.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Darren Hart <darren@os.amperecomputing.com>
Cc: Ganapatrao Kulkarni <gankulkarni@os.amperecomputing.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.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/20230331055645.26918-2-mike.leach@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 17 insertions, 10 deletions

diff --git a/tools/perf/arch/arm/util/cs-etm.c b/tools/perf/arch/arm/util/cs-etm.c
index 86b61ad74f90..e02a9bfc3d42 100644
--- a/tools/perf/arch/arm/util/cs-etm.c
+++ b/tools/perf/arch/arm/util/cs-etm.c
@@ -437,13 +437,16 @@ static int cs_etm_recording_options(struct auxtrace_record *itr,
 	evlist__to_front(evlist, cs_etm_evsel);
 
 	/*
-	 * In the case of per-cpu mmaps, we need the CPU on the
-	 * AUX event.  We also need the contextID in order to be notified
+	 * get the CPU on the sample - need it to associate trace ID in the
+	 * AUX_OUTPUT_HW_ID event, and the AUX event for per-cpu mmaps.
+	 */
+	evsel__set_sample_bit(cs_etm_evsel, CPU);
+
+	/*
+	 * Also the case of per-cpu mmaps, need the contextID in order to be notified
 	 * when a context switch happened.
 	 */
 	if (!perf_cpu_map__empty(cpus)) {
-		evsel__set_sample_bit(cs_etm_evsel, CPU);
-
 		err = cs_etm_set_option(itr, cs_etm_evsel,
 					BIT(ETM_OPT_CTXTID) | BIT(ETM_OPT_TS));
 		if (err)
@@ -679,8 +682,10 @@ static void cs_etm_save_etmv4_header(__u64 data[], struct auxtrace_record *itr,
 
 	/* 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);
+	/* traceID set to legacy version, in case new perf running on older system */
+	data[CS_ETMV4_TRCTRACEIDR] =
+		CORESIGHT_LEGACY_CPU_TRACE_ID(cpu) | CORESIGHT_TRACE_ID_UNUSED_FLAG;
+
 	/* Get read-only information from sysFS */
 	data[CS_ETMV4_TRCIDR0] = cs_etm_get_ro(cs_etm_pmu, cpu,
 					       metadata_etmv4_ro[CS_ETMV4_TRCIDR0]);
@@ -711,8 +716,10 @@ static void cs_etm_save_ete_header(__u64 data[], struct auxtrace_record *itr, in
 
 	/* Get trace configuration register */
 	data[CS_ETE_TRCCONFIGR] = cs_etmv4_get_config(itr);
-	/* Get traceID from the framework */
-	data[CS_ETE_TRCTRACEIDR] = coresight_get_trace_id(cpu);
+	/* traceID set to legacy version, in case new perf running on older system */
+	data[CS_ETE_TRCTRACEIDR] =
+		CORESIGHT_LEGACY_CPU_TRACE_ID(cpu) | CORESIGHT_TRACE_ID_UNUSED_FLAG;
+
 	/* Get read-only information from sysFS */
 	data[CS_ETE_TRCIDR0] = cs_etm_get_ro(cs_etm_pmu, cpu,
 					     metadata_ete_ro[CS_ETE_TRCIDR0]);
@@ -768,9 +775,9 @@ static void cs_etm_get_metadata(int cpu, u32 *offset,
 		magic = __perf_cs_etmv3_magic;
 		/* Get configuration register */
 		info->priv[*offset + CS_ETM_ETMCR] = cs_etm_get_config(itr);
-		/* Get traceID from the framework */
+		/* traceID set to legacy value in case new perf running on old system */
 		info->priv[*offset + CS_ETM_ETMTRACEIDR] =
-						coresight_get_trace_id(cpu);
+			CORESIGHT_LEGACY_CPU_TRACE_ID(cpu) | CORESIGHT_TRACE_ID_UNUSED_FLAG;
 		/* Get read-only information from sysFS */
 		info->priv[*offset + CS_ETM_ETMCCER] =
 			cs_etm_get_ro(cs_etm_pmu, cpu,