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Message-ID: <20250914181121.1952748-11-irogers@google.com>
Date: Sun, 14 Sep 2025 11:11:10 -0700
From: Ian Rogers <irogers@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>,
Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>,
Kan Liang <kan.liang@...ux.intel.com>, James Clark <james.clark@...aro.org>,
Xu Yang <xu.yang_2@....com>, Thomas Falcon <thomas.falcon@...el.com>,
Andi Kleen <ak@...ux.intel.com>, linux-kernel@...r.kernel.org,
linux-perf-users@...r.kernel.org, bpf@...r.kernel.org,
Atish Patra <atishp@...osinc.com>, Beeman Strong <beeman@...osinc.com>, Leo Yan <leo.yan@....com>,
Vince Weaver <vincent.weaver@...ne.edu>
Cc: Thomas Richter <tmricht@...ux.ibm.com>
Subject: [PATCH v4 10/21] perf jevents: Add legacy json terms and default_core
event table helper
Add json LegacyConfigCode and LegacyCacheCode values that translate to
legacy-hardware-config and legacy-cache-config event terms
respectively.
Add perf_pmu__default_core_events_table as a means to find a
default_core event table that will later contain legacy events.
In situations like hypervisors it is more likely that tables will be
NULL. Rather than testing in the calling PMU code, early exit in the
pmu-event.c routines.
Signed-off-by: Ian Rogers <irogers@...gle.com>
Tested-by: Thomas Richter <tmricht@...ux.ibm.com>
---
tools/perf/pmu-events/empty-pmu-events.c | 26 +++++++++++++++++++
tools/perf/pmu-events/jevents.py | 32 ++++++++++++++++++++++++
tools/perf/pmu-events/pmu-events.h | 1 +
3 files changed, 59 insertions(+)
diff --git a/tools/perf/pmu-events/empty-pmu-events.c b/tools/perf/pmu-events/empty-pmu-events.c
index 041c598b16d8..2393b3a7a4c9 100644
--- a/tools/perf/pmu-events/empty-pmu-events.c
+++ b/tools/perf/pmu-events/empty-pmu-events.c
@@ -461,6 +461,8 @@ int pmu_events_table__for_each_event(const struct pmu_events_table *table,
pmu_event_iter_fn fn,
void *data)
{
+ if (!table)
+ return 0;
for (size_t i = 0; i < table->num_pmus; i++) {
const struct pmu_table_entry *table_pmu = &table->pmus[i];
const char *pmu_name = &big_c_string[table_pmu->pmu_name.offset];
@@ -482,6 +484,8 @@ int pmu_events_table__find_event(const struct pmu_events_table *table,
pmu_event_iter_fn fn,
void *data)
{
+ if (!table)
+ return PMU_EVENTS__NOT_FOUND;
for (size_t i = 0; i < table->num_pmus; i++) {
const struct pmu_table_entry *table_pmu = &table->pmus[i];
const char *pmu_name = &big_c_string[table_pmu->pmu_name.offset];
@@ -502,6 +506,8 @@ size_t pmu_events_table__num_events(const struct pmu_events_table *table,
{
size_t count = 0;
+ if (!table)
+ return 0;
for (size_t i = 0; i < table->num_pmus; i++) {
const struct pmu_table_entry *table_pmu = &table->pmus[i];
const char *pmu_name = &big_c_string[table_pmu->pmu_name.offset];
@@ -580,6 +586,8 @@ int pmu_metrics_table__for_each_metric(const struct pmu_metrics_table *table,
pmu_metric_iter_fn fn,
void *data)
{
+ if (!table)
+ return 0;
for (size_t i = 0; i < table->num_pmus; i++) {
int ret = pmu_metrics_table__for_each_metric_pmu(table, &table->pmus[i],
fn, data);
@@ -596,6 +604,8 @@ int pmu_metrics_table__find_metric(const struct pmu_metrics_table *table,
pmu_metric_iter_fn fn,
void *data)
{
+ if (!table)
+ return 0;
for (size_t i = 0; i < table->num_pmus; i++) {
const struct pmu_table_entry *table_pmu = &table->pmus[i];
const char *pmu_name = &big_c_string[table_pmu->pmu_name.offset];
@@ -707,6 +717,22 @@ const struct pmu_events_table *perf_pmu__find_events_table(struct perf_pmu *pmu)
return NULL;
}
+const struct pmu_events_table *perf_pmu__default_core_events_table(void)
+{
+ int i = 0;
+
+ for (;;) {
+ const struct pmu_events_map *map = &pmu_events_map[i++];
+
+ if (!map->arch)
+ break;
+
+ if (!strcmp(map->cpuid, "common"))
+ return &map->event_table;
+ }
+ return NULL;
+}
+
const struct pmu_metrics_table *pmu_metrics_table__find(void)
{
struct perf_cpu cpu = {-1};
diff --git a/tools/perf/pmu-events/jevents.py b/tools/perf/pmu-events/jevents.py
index 168c044dd7cc..1f3917cbff87 100755
--- a/tools/perf/pmu-events/jevents.py
+++ b/tools/perf/pmu-events/jevents.py
@@ -325,6 +325,8 @@ class JsonEvent:
eventcode |= int(jd['ExtSel']) << 8
configcode = int(jd['ConfigCode'], 0) if 'ConfigCode' in jd else None
eventidcode = int(jd['EventidCode'], 0) if 'EventidCode' in jd else None
+ legacy_hw_config = int(jd['LegacyConfigCode'], 0) if 'LegacyConfigCode' in jd else None
+ legacy_cache_config = int(jd['LegacyCacheCode'], 0) if 'LegacyCacheCode' in jd else None
self.name = jd['EventName'].lower() if 'EventName' in jd else None
self.topic = ''
self.compat = jd.get('Compat')
@@ -370,6 +372,10 @@ class JsonEvent:
event = f'config={llx(configcode)}'
elif eventidcode is not None:
event = f'eventid={llx(eventidcode)}'
+ elif legacy_hw_config is not None:
+ event = f'legacy-hardware-config={llx(legacy_hw_config)}'
+ elif legacy_cache_config is not None:
+ event = f'legacy-cache-config={llx(legacy_cache_config)}'
else:
event = f'event={llx(eventcode)}'
event_fields = [
@@ -951,6 +957,8 @@ int pmu_events_table__for_each_event(const struct pmu_events_table *table,
pmu_event_iter_fn fn,
void *data)
{
+ if (!table)
+ return 0;
for (size_t i = 0; i < table->num_pmus; i++) {
const struct pmu_table_entry *table_pmu = &table->pmus[i];
const char *pmu_name = &big_c_string[table_pmu->pmu_name.offset];
@@ -972,6 +980,8 @@ int pmu_events_table__find_event(const struct pmu_events_table *table,
pmu_event_iter_fn fn,
void *data)
{
+ if (!table)
+ return PMU_EVENTS__NOT_FOUND;
for (size_t i = 0; i < table->num_pmus; i++) {
const struct pmu_table_entry *table_pmu = &table->pmus[i];
const char *pmu_name = &big_c_string[table_pmu->pmu_name.offset];
@@ -992,6 +1002,8 @@ size_t pmu_events_table__num_events(const struct pmu_events_table *table,
{
size_t count = 0;
+ if (!table)
+ return 0;
for (size_t i = 0; i < table->num_pmus; i++) {
const struct pmu_table_entry *table_pmu = &table->pmus[i];
const char *pmu_name = &big_c_string[table_pmu->pmu_name.offset];
@@ -1070,6 +1082,8 @@ int pmu_metrics_table__for_each_metric(const struct pmu_metrics_table *table,
pmu_metric_iter_fn fn,
void *data)
{
+ if (!table)
+ return 0;
for (size_t i = 0; i < table->num_pmus; i++) {
int ret = pmu_metrics_table__for_each_metric_pmu(table, &table->pmus[i],
fn, data);
@@ -1086,6 +1100,8 @@ int pmu_metrics_table__find_metric(const struct pmu_metrics_table *table,
pmu_metric_iter_fn fn,
void *data)
{
+ if (!table)
+ return 0;
for (size_t i = 0; i < table->num_pmus; i++) {
const struct pmu_table_entry *table_pmu = &table->pmus[i];
const char *pmu_name = &big_c_string[table_pmu->pmu_name.offset];
@@ -1197,6 +1213,22 @@ const struct pmu_events_table *perf_pmu__find_events_table(struct perf_pmu *pmu)
return NULL;
}
+const struct pmu_events_table *perf_pmu__default_core_events_table(void)
+{
+ int i = 0;
+
+ for (;;) {
+ const struct pmu_events_map *map = &pmu_events_map[i++];
+
+ if (!map->arch)
+ break;
+
+ if (!strcmp(map->cpuid, "common"))
+ return &map->event_table;
+ }
+ return NULL;
+}
+
const struct pmu_metrics_table *pmu_metrics_table__find(void)
{
struct perf_cpu cpu = {-1};
diff --git a/tools/perf/pmu-events/pmu-events.h b/tools/perf/pmu-events/pmu-events.h
index ea022ea55087..e0535380c0b2 100644
--- a/tools/perf/pmu-events/pmu-events.h
+++ b/tools/perf/pmu-events/pmu-events.h
@@ -125,6 +125,7 @@ int pmu_metrics_table__find_metric(const struct pmu_metrics_table *table,
void *data);
const struct pmu_events_table *perf_pmu__find_events_table(struct perf_pmu *pmu);
+const struct pmu_events_table *perf_pmu__default_core_events_table(void);
const struct pmu_metrics_table *pmu_metrics_table__find(void);
const struct pmu_events_table *find_core_events_table(const char *arch, const char *cpuid);
const struct pmu_metrics_table *find_core_metrics_table(const char *arch, const char *cpuid);
--
2.51.0.384.g4c02a37b29-goog
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