[PATCH v2 3/7] perf arm-spe: Introduce arm_spe__is_homogeneous()

From: Leo Yan
Date: Sat Sep 14 2024 - 18:10:19 EST


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@xxxxxxx>
---
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 7cde6584b02d..7e00cf1c287c 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_nr_cpu;
+ bool is_homogeneous;
};

struct arm_spe_queue {
@@ -1374,6 +1375,30 @@ arm_spe_synth_events(struct arm_spe *spe, struct perf_session *session)
return 0;
}

+static bool arm_spe__is_homogeneous(u64 **metadata, int nr_cpu)
+{
+ u64 midr;
+ int i;
+
+ if (!nr_cpu)
+ return false;
+
+ for (i = 0; i < nr_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)
{
@@ -1417,6 +1442,7 @@ int arm_spe_process_auxtrace_info(union perf_event *event,
spe->metadata = metadata;
spe->metadata_ver = metadata_ver;
spe->metadata_nr_cpu = nr_cpu;
+ spe->is_homogeneous = arm_spe__is_homogeneous(metadata, nr_cpu);

spe->timeless_decoding = arm_spe__is_timeless_decoding(spe);

--
2.34.1