linux-kernel - [PATCH 2/6] perf cs-etm: Initialise architecture based on TRCIDR1

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Date:   Wed, 21 Jul 2021 10:07:01 +0100
From:   James Clark <james.clark@....com>
To:     acme@...nel.org, mathieu.poirier@...aro.org,
        coresight@...ts.linaro.org
Cc:     leo.yan@...aro.org, al.grant@....com, suzuki.poulose@....com,
        anshuman.khandual@....com, mike.leach@...aro.org,
        James Clark <james.clark@....com>,
        John Garry <john.garry@...wei.com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org
Subject: [PATCH 2/6] perf cs-etm: Initialise architecture based on TRCIDR1

Currently the architecture is hard coded as ARCH_V8, but with the
introduction of ETE we want to pick ARCH_AA64. And this change is also
applicable to ETM v4.4 onwards as well.

Signed-off-by: James Clark <james.clark@....com>
---
 tools/perf/util/cs-etm-decoder/cs-etm-decoder.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
index 30889a9d0165..5972a8afcc6b 100644
--- a/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
+++ b/tools/perf/util/cs-etm-decoder/cs-etm-decoder.c
@@ -126,6 +126,18 @@ static int cs_etm_decoder__gen_etmv3_config(struct cs_etm_trace_params *params,
 	return 0;
 }
 
+#define TRCIDR1_TRCARCHMIN_SHIFT 4
+#define TRCIDR1_TRCARCHMIN_MASK  GENMASK(7, 4)
+#define TRCIDR1_TRCARCHMIN(x)    (((x) & TRCIDR1_TRCARCHMIN_MASK) >> TRCIDR1_TRCARCHMIN_SHIFT)
+static enum _ocsd_arch_version cs_etm_decoder__get_arch_ver(u32 reg_idr1)
+{
+	/*
+	 * If the ETM trace minor version is 4 or more then we can assume
+	 * the architecture is ARCH_AA64 rather than just V8
+	 */
+	return TRCIDR1_TRCARCHMIN(reg_idr1) >= 4 ? ARCH_AA64 : ARCH_V8;
+}
+
 static void cs_etm_decoder__gen_etmv4_config(struct cs_etm_trace_params *params,
 					     ocsd_etmv4_cfg *config)
 {
@@ -140,7 +152,7 @@ static void cs_etm_decoder__gen_etmv4_config(struct cs_etm_trace_params *params,
 	config->reg_idr11 = 0;
 	config->reg_idr12 = 0;
 	config->reg_idr13 = 0;
-	config->arch_ver = ARCH_V8;
+	config->arch_ver = cs_etm_decoder__get_arch_ver(params->etmv4.reg_idr1);
 	config->core_prof = profile_CortexA;
 }
 
-- 
2.28.0