[PATCH v2 23/43] perf parse-events: Wildcard legacy cache events

Ian Rogers
2023-04-28T07:43:19Z

It is inconsistent that "perf stat -e instructions-retired" wildcard
opens on all PMUs while legacy cache events like "perf stat -e
L1-dcache-load-miss" do not. A behavior introduced by hybrid is that a
legacy cache event like L1-dcache-load-miss should wildcard open on
all hybrid PMUs. Previously hybrid would call to is_event_supported
for each PMU, a failure of which results in the event not being
added. This isn't done in this case as the parser should just create
perf_event_attr and the later open should fail, or the counter give
"<not counted>". If this wants to be avoided then the PMU can be named
with the event.

Signed-off-by: Ian Rogers <irogers@google.com>
---
tools/perf/util/parse-events-hybrid.c | 33 -------------
tools/perf/util/parse-events-hybrid.h | 7 ---
tools/perf/util/parse-events.c | 68 ++++++++++++++-------------
tools/perf/util/parse-events.h | 3 +-
tools/perf/util/parse-events.y | 2 +-
5 files changed, 37 insertions(+), 76 deletions(-)

diff --git a/tools/perf/util/parse-events-hybrid.c b/tools/perf/util/parse-events-hybrid.c
index 7c9f9150bad5..d2c0be051d46 100644
--- a/tools/perf/util/parse-events-hybrid.c
+++ b/tools/perf/util/parse-events-hybrid.c
@@ -179,36 +179,3 @@ int parse_events__add_numeric_hybrid(struct parse_events_state *parse_state,
return add_raw_hybrid(parse_state, list, attr, name, metric_id,
config_terms);
}
-
-int parse_events__add_cache_hybrid(struct list_head *list, int *idx,
- struct perf_event_attr *attr,
- const char *name,
- const char *metric_id,
- struct list_head *config_terms,
- bool *hybrid,
- struct parse_events_state *parse_state)
-{
- struct perf_pmu *pmu;
- int ret;
-
- *hybrid = false;
- if (!perf_pmu__has_hybrid())
- return 0;
-
- *hybrid = true;
- perf_pmu__for_each_hybrid_pmu(pmu) {
- LIST_HEAD(terms);
-
- if (pmu_cmp(parse_state, pmu))
- continue;
-
- copy_config_terms(&terms, config_terms);
- ret = create_event_hybrid(PERF_TYPE_HW_CACHE, idx, list,
- attr, name, metric_id, &terms, pmu);
- free_config_terms(&terms);
- if (ret)
- return ret;
- }
-
- return 0;
-}
diff --git a/tools/perf/util/parse-events-hybrid.h b/tools/perf/util/parse-events-hybrid.h
index cbc05fec02a2..bc2966e73897 100644
--- a/tools/perf/util/parse-events-hybrid.h
+++ b/tools/perf/util/parse-events-hybrid.h
@@ -15,11 +15,4 @@ int parse_events__add_numeric_hybrid(struct parse_events_state *parse_state,
struct list_head *config_terms,
bool *hybrid);

-int parse_events__add_cache_hybrid(struct list_head *list, int *idx,
- struct perf_event_attr *attr,
- const char *name, const char *metric_id,
- struct list_head *config_terms,
- bool *hybrid,
- struct parse_events_state *parse_state);
-
#endif /* __PERF_PARSE_EVENTS_HYBRID_H */
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 166f4dc5bae2..a07d4ecad13e 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -472,46 +472,48 @@ static int parse_events__decode_legacy_cache(const char *name, int pmu_type, __u

int parse_events_add_cache(struct list_head *list, int *idx, const char *name,
struct parse_events_error *err,
- struct list_head *head_config,
- struct parse_events_state *parse_state)
+ struct list_head *head_config)
{
- struct perf_event_attr attr;
- LIST_HEAD(config_terms);
- const char *config_name, *metric_id;
- int ret;
- bool hybrid;
+ struct perf_pmu *pmu = NULL;
+ bool found_supported = false;
+ const char *config_name = get_config_name(head_config);
+ const char *metric_id = get_config_metric_id(head_config);

+ while ((pmu = perf_pmu__scan(pmu)) != NULL) {
+ LIST_HEAD(config_terms);
+ struct perf_event_attr attr;
+ int ret;

- memset(&attr, 0, sizeof(attr));
- attr.type = PERF_TYPE_HW_CACHE;
- ret = parse_events__decode_legacy_cache(name, /*pmu_type=*/0, &attr.config);
- if (ret)
- return ret;
+ /* Skip unsupported PMUs. */
+ if (!perf_pmu__supports_legacy_cache(pmu))
+ continue;

- if (head_config) {
- if (config_attr(&attr, head_config, err,
- config_term_common))
- return -EINVAL;
+ memset(&attr, 0, sizeof(attr));
+ attr.type = PERF_TYPE_HW_CACHE;

- if (get_config_terms(head_config, &config_terms))
- return -ENOMEM;
- }
+ ret = parse_events__decode_legacy_cache(name, pmu->type, &attr.config);
+ if (ret)
+ return ret;

- config_name = get_config_name(head_config);
- metric_id = get_config_metric_id(head_config);
- ret = parse_events__add_cache_hybrid(list, idx, &attr,
- config_name ? : name,
- metric_id,
- &config_terms,
- &hybrid, parse_state);
- if (hybrid)
- goto out_free_terms;
+ found_supported = true;

- ret = add_event(list, idx, &attr, config_name ? : name, metric_id,
- &config_terms);
-out_free_terms:
- free_config_terms(&config_terms);
- return ret;
+ if (head_config) {
+ if (config_attr(&attr, head_config, err,
+ config_term_common))
+ return -EINVAL;
+
+ if (get_config_terms(head_config, &config_terms))
+ return -ENOMEM;
+ }
+
+ if (__add_event(list, idx, &attr, /*init_attr*/true, config_name ?: name,
+ metric_id, pmu, &config_terms, /*auto_merge_stats=*/false,
+ /*cpu_list=*/NULL) == NULL)
+ return -ENOMEM;
+
+ free_config_terms(&config_terms);
+ }
+ return found_supported ? 0 : -EINVAL;
}

#ifdef HAVE_LIBTRACEEVENT
diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h
index 5acb62c2e00a..0c26303f7f63 100644
--- a/tools/perf/util/parse-events.h
+++ b/tools/perf/util/parse-events.h
@@ -172,8 +172,7 @@ int parse_events_add_tool(struct parse_events_state *parse_state,
int tool_event);
int parse_events_add_cache(struct list_head *list, int *idx, const char *name,
struct parse_events_error *error,
- struct list_head *head_config,
- struct parse_events_state *parse_state);
+ struct list_head *head_config);
int parse_events_add_breakpoint(struct list_head *list, int *idx,
u64 addr, char *type, u64 len);
int parse_events_add_pmu(struct parse_events_state *parse_state,
diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y
index f84fa1b132b3..cc7528558845 100644
--- a/tools/perf/util/parse-events.y
+++ b/tools/perf/util/parse-events.y
@@ -476,7 +476,7 @@ PE_LEGACY_CACHE opt_event_config

list = alloc_list();
ABORT_ON(!list);
- err = parse_events_add_cache(list, &parse_state->idx, $1, error, $2, parse_state);
+ err = parse_events_add_cache(list, &parse_state->idx, $1, error, $2);

parse_events_terms__delete($2);
free($1);
--
2.40.1.495.gc816e09b53d-goog