linux-kernel - [PATCH 07/10] perf: cs-etm: Update event to read trace ID from sysfs

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Message-Id: <20220308205000.27646-8-mike.leach@linaro.org>
Date:   Tue,  8 Mar 2022 20:49:57 +0000
From:   Mike Leach <mike.leach@...aro.org>
To:     suzuki.poulose@....com, coresight@...ts.linaro.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     mathieu.poirier@...aro.org, peterz@...radead.org, mingo@...hat.com,
        acme@...nel.org, linux-perf-users@...r.kernel.org,
        leo.yan@...aro.org, Mike Leach <mike.leach@...aro.org>
Subject: [PATCH 07/10] perf: cs-etm: Update event to read trace ID from sysfs

Read the current trace ID values associated with a CPU
from sysfs.

Previously used the static association algorithm that is no longer
used as it did not scale and was broken for larger core counts.

Signed-off-by: Mike Leach <mike.leach@...aro.org>
---
 tools/perf/arch/arm/util/cs-etm.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/tools/perf/arch/arm/util/cs-etm.c b/tools/perf/arch/arm/util/cs-etm.c
index 2e8b2c4365a0..f48087d07bcb 100644
--- a/tools/perf/arch/arm/util/cs-etm.c
+++ b/tools/perf/arch/arm/util/cs-etm.c
@@ -43,11 +43,13 @@ struct cs_etm_recording {
 };
 
 static const char *metadata_etmv3_ro[CS_ETM_PRIV_MAX] = {
+	[CS_ETM_ETMTRACEIDR]	= "traceid",
 	[CS_ETM_ETMCCER]	= "mgmt/etmccer",
 	[CS_ETM_ETMIDR]		= "mgmt/etmidr",
 };
 
 static const char * const metadata_etmv4_ro[] = {
+	[CS_ETMV4_TRCTRACEIDR]		= "mgmt/trctraceid",
 	[CS_ETMV4_TRCIDR0]		= "trcidr/trcidr0",
 	[CS_ETMV4_TRCIDR1]		= "trcidr/trcidr1",
 	[CS_ETMV4_TRCIDR2]		= "trcidr/trcidr2",
@@ -629,8 +631,9 @@ 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);
+	/* Get traceID from the sysfs */
+	data[CS_ETMV4_TRCTRACEIDR] = cs_etm_get_ro(cs_etm_pmu, cpu,
+						   metadata_etmv4_ro[CS_ETMV4_TRCTRACEIDR]);
 	/* Get read-only information from sysFS */
 	data[CS_ETMV4_TRCIDR0] = cs_etm_get_ro(cs_etm_pmu, cpu,
 					       metadata_etmv4_ro[CS_ETMV4_TRCIDR0]);
@@ -677,9 +680,10 @@ 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 */
+		/* Get traceID from sysfs */
 		info->priv[*offset + CS_ETM_ETMTRACEIDR] =
-						coresight_get_trace_id(cpu);
+			cs_etm_get_ro(cs_etm_pmu, cpu,
+				      metadata_etmv3_ro[CS_ETM_ETMTRACEIDR]);
 		/* Get read-only information from sysFS */
 		info->priv[*offset + CS_ETM_ETMCCER] =
 			cs_etm_get_ro(cs_etm_pmu, cpu,
-- 
2.17.1