linux-kernel - [PATCH v1 3/7] perf arm-spe: Introduce arm_spe__is

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Message-Id: <20240827165125.3311306-4-leo.yan@arm.com>
Date: Tue, 27 Aug 2024 17:51:21 +0100
From: Leo Yan <leo.yan@....com>
To: Arnaldo Carvalho de Melo <acme@...nel.org>,
	James Clark <james.clark@...aro.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Ian Rogers <irogers@...gle.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	John Garry <john.g.garry@...cle.com>,
	Will Deacon <will@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Mike Leach <mike.leach@...aro.org>,
	linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Cc: Leo Yan <leo.yan@....com>
Subject: [PATCH v1 3/7] perf arm-spe: Introduce arm_spe__is_homogeneous()

Introduce the arm_spe__is_homogeneous() function, it uses to check if
Arm SPE is homogeneous cross all CPUs.

Signed-off-by: Leo Yan <leo.yan@....com>
---
 tools/perf/util/arm-spe.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/tools/perf/util/arm-spe.c b/tools/perf/util/arm-spe.c
index 2ab9078d49fc..e7ad52215066 100644
--- a/tools/perf/util/arm-spe.c
+++ b/tools/perf/util/arm-spe.c
@@ -82,6 +82,7 @@ struct arm_spe {
 	u64				**metadata;
 	u64				metadata_ver;
 	u64				metadata_num_cpu;
+	bool				is_homogeneous;
 };
 
 struct arm_spe_queue {
@@ -1316,6 +1317,30 @@ static u64 *arm_spe__create_meta_blk(u64 *buf, int per_cpu_size)
 	return metadata;
 }
 
+static bool arm_spe__is_homogeneous(u64 **metadata, int num_cpu)
+{
+	u64 midr;
+	int i;
+
+	if (!num_cpu)
+		return false;
+
+	for (i = 0; i < num_cpu; i++) {
+		if (!metadata[i])
+			return false;
+
+		if (i == 0) {
+			midr = metadata[i][ARM_SPE_CPU_MIDR];
+			continue;
+		}
+
+		if (midr != metadata[i][ARM_SPE_CPU_MIDR])
+			return false;
+	}
+
+	return true;
+}
+
 int arm_spe_process_auxtrace_info(union perf_event *event,
 				  struct perf_session *session)
 {
@@ -1384,6 +1409,7 @@ int arm_spe_process_auxtrace_info(union perf_event *event,
 	spe->metadata = metadata;
 	spe->metadata_ver = metadata_ver;
 	spe->metadata_num_cpu = num_cpu;
+	spe->is_homogeneous = arm_spe__is_homogeneous(metadata, num_cpu);
 
 	spe->timeless_decoding = arm_spe__is_timeless_decoding(spe);
 
-- 
2.34.1