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perf arm-spe: Introduce arm_spe__is_homogeneous()

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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@arm.com>
Reviewed-by: James Clark <james.clark@linaro.org>
Link: https://lore.kernel.org/r/20241003185322.192357-4-leo.yan@arm.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
This commit is contained in:
Leo Yan
2024-10-03 19:53:18 +01:00
committed by Namhyung Kim
parent 50b8f1d5bf
commit 56ae663e76
1 changed files with 26 additions and 0 deletions
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26
tools/perf/util/arm-spe.c
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@@ -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)
{
@@ -1419,6 +1444,7 @@ 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);