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Message-Id: <20240914215458.751802-5-leo.yan@arm.com>
Date: Sat, 14 Sep 2024 22:54:57 +0100
From: Leo Yan <leo.yan@....com>
To: Arnaldo Carvalho de Melo <acme@...nel.org>,
James Clark <james.clark@...aro.org>,
Mike Leach <mike.leach@...aro.org>,
Will Deacon <will@...nel.org>,
Namhyung Kim <namhyung@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Jiri Olsa <jolsa@...nel.org>,
Ian Rogers <irogers@...gle.com>,
Adrian Hunter <adrian.hunter@...el.com>,
"Liang, Kan" <kan.liang@...ux.intel.com>,
linux-arm-kernel@...ts.infradead.org,
linux-perf-users@...r.kernel.org,
linux-kernel@...r.kernel.org
Cc: Leo Yan <leo.yan@....com>
Subject: [PATCH v2 4/5] perf arm-spe: Support metadata version 2
This commit is to support metadata version 2 and at the meantime it is
backward compatible for version 1's format.
The metadata version 1 doesn't include the ARM_SPE_HEADER_VERSION field.
As version 1 is fixed with two u64 fields, by checking the metadata
size, it distinguishes the metadata is version 1 or version 2 (and any
new versions if later will have). For version 2, it reads out CPU number
and retrieves the metadata info for every CPU.
Signed-off-by: Leo Yan <leo.yan@....com>
---
tools/perf/util/arm-spe.c | 95 +++++++++++++++++++++++++++++++++++++--
1 file changed, 92 insertions(+), 3 deletions(-)
diff --git a/tools/perf/util/arm-spe.c b/tools/perf/util/arm-spe.c
index 70989b1bae47..17782cb40fb5 100644
--- a/tools/perf/util/arm-spe.c
+++ b/tools/perf/util/arm-spe.c
@@ -78,6 +78,10 @@ struct arm_spe {
unsigned long num_events;
u8 use_ctx_pkt_for_pid;
+
+ u64 **metadata;
+ u64 metadata_ver;
+ u64 metadata_nr_cpu;
};
struct arm_spe_queue {
@@ -1016,6 +1020,73 @@ static int arm_spe_flush(struct perf_session *session __maybe_unused,
return 0;
}
+static u64 *arm_spe__alloc_per_cpu_metadata(u64 *buf, int cpu_size)
+{
+ u64 *metadata;
+
+ metadata = zalloc(sizeof(*metadata) * cpu_size);
+ if (!metadata)
+ return NULL;
+
+ memcpy(metadata, buf, cpu_size);
+ return metadata;
+}
+
+static void arm_spe__free_metadata(u64 **metadata, int nr_cpu)
+{
+ int i;
+
+ for (i = 0; i < nr_cpu; i++)
+ zfree(&metadata[i]);
+ free(metadata);
+}
+
+static u64 **arm_spe__alloc_metadata(struct perf_record_auxtrace_info *info,
+ u64 *ver, int *nr_cpu)
+{
+ u64 *ptr = (u64 *)info->priv;
+ u64 metadata_size;
+ u64 **metadata = NULL;
+ int hdr_sz, cpu_sz, i;
+
+ metadata_size = info->header.size -
+ sizeof(struct perf_record_auxtrace_info);
+
+ /* Metadata version 1 */
+ if (metadata_size == ARM_SPE_AUXTRACE_V1_PRIV_SIZE) {
+ *ver = 1;
+ *nr_cpu = 0;
+ /* No per CPU metadata */
+ return NULL;
+ }
+
+ *ver = ptr[ARM_SPE_HEADER_VERSION];
+ hdr_sz = ptr[ARM_SPE_HEADER_SIZE];
+ *nr_cpu = ptr[ARM_SPE_CPUS_NUM];
+
+ metadata = zalloc(sizeof(*metadata) * (*nr_cpu));
+ if (!metadata)
+ return NULL;
+
+ /* Locate the start address of per CPU metadata */
+ ptr += hdr_sz;
+ cpu_sz = (metadata_size - (hdr_sz * sizeof(u64))) / (*nr_cpu);
+
+ for (i = 0; i < *nr_cpu; i++) {
+ metadata[i] = arm_spe__alloc_per_cpu_metadata(ptr, cpu_sz);
+ if (!metadata[i])
+ goto err_per_cpu_metadata;
+
+ ptr += cpu_sz / sizeof(u64);
+ }
+
+ return metadata;
+
+err_per_cpu_metadata:
+ arm_spe__free_metadata(metadata, *nr_cpu);
+ return NULL;
+}
+
static void arm_spe_free_queue(void *priv)
{
struct arm_spe_queue *speq = priv;
@@ -1050,6 +1121,7 @@ static void arm_spe_free(struct perf_session *session)
auxtrace_heap__free(&spe->heap);
arm_spe_free_events(session);
session->auxtrace = NULL;
+ arm_spe__free_metadata(spe->metadata, spe->metadata_nr_cpu);
free(spe);
}
@@ -1267,15 +1339,24 @@ int arm_spe_process_auxtrace_info(union perf_event *event,
const char *cpuid = perf_env__cpuid(session->evlist->env);
u64 midr = strtol(cpuid, NULL, 16);
struct arm_spe *spe;
- int err;
+ u64 **metadata = NULL;
+ u64 metadata_ver;
+ int nr_cpu, err;
if (auxtrace_info->header.size < sizeof(struct perf_record_auxtrace_info) +
min_sz)
return -EINVAL;
+ metadata = arm_spe__alloc_metadata(auxtrace_info, &metadata_ver,
+ &nr_cpu);
+ if (!metadata && metadata_ver != 1) {
+ pr_err("Failed to parse Arm SPE metadata.\n");
+ return -EINVAL;
+ }
+
spe = zalloc(sizeof(struct arm_spe));
if (!spe)
- return -ENOMEM;
+ goto err_free_metadata;
err = auxtrace_queues__init(&spe->queues);
if (err)
@@ -1284,8 +1365,14 @@ int arm_spe_process_auxtrace_info(union perf_event *event,
spe->session = session;
spe->machine = &session->machines.host; /* No kvm support */
spe->auxtrace_type = auxtrace_info->type;
- spe->pmu_type = auxtrace_info->priv[ARM_SPE_PMU_TYPE];
+ if (metadata_ver == 1)
+ spe->pmu_type = auxtrace_info->priv[ARM_SPE_PMU_TYPE];
+ else
+ spe->pmu_type = auxtrace_info->priv[ARM_SPE_SHARED_PMU_TYPE];
spe->midr = midr;
+ spe->metadata = metadata;
+ spe->metadata_ver = metadata_ver;
+ spe->metadata_nr_cpu = nr_cpu;
spe->timeless_decoding = arm_spe__is_timeless_decoding(spe);
@@ -1346,5 +1433,7 @@ int arm_spe_process_auxtrace_info(union perf_event *event,
session->auxtrace = NULL;
err_free:
free(spe);
+err_free_metadata:
+ arm_spe__free_metadata(metadata, nr_cpu);
return err;
}
--
2.34.1
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