[RFC PATCH v2 08/13] perf pmu: Add pmu_add_sys_aliases()

[John Garry]

Add pmu_add_sys_aliases() to add system PMU events aliases.

For adding system PMU events, we iterate through all the events per
SoC event table in pmu_sys_event_tables[].

Matches must satisfy both:
- PMU identifier matches event "compat" value
- like uncore event matching, the event "Unit" member must match; this
  match under return value of pmu_uncore_alias_match() (maybe rename that
  function?)

Signed-off-by: John Garry <john.garry@xxxxxxxxxx>
---
 tools/perf/util/pmu.c | 79 +++++++++++++++++++++++++++++++++++++++++++++++++++
 tools/perf/util/pmu.h |  5 ++++
 2 files changed, 84 insertions(+)

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 6a67c6a28d08..2f38465e8a73 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -827,6 +827,84 @@ static void pmu_add_cpu_aliases(struct list_head *head, struct perf_pmu *pmu)
 	pmu_add_cpu_aliases_map(head, pmu, map);
 }
 
+void pmu_for_each_sys_event(struct perf_pmu *pmu, pmu_sys_event_iter_fn fn,
+			    void *data)
+{
+	struct pmu_event *pe;
+	int i = 0;
+
+	if (!pmu->id)
+		return;
+
+	while (1) {
+		struct pmu_sys_events *event_table;
+		int j = 0;
+
+		event_table = &pmu_sys_event_tables[i++];
+
+		if (!event_table->table)
+			break;
+
+		while (1) {
+			int ret;
+
+			pe = &event_table->table[j++];
+
+			if (!pe->name && !pe->metric_group && !pe->metric_name)
+				break;
+
+			ret = fn(pmu, pe, data);
+			if (ret)
+				break;
+		}
+	}
+}
+
+struct pmu_sys_event_iter_data {
+	struct list_head *head;
+};
+
+static int pmu_add_sys_aliases_iter_fn(struct perf_pmu *pmu,
+				       struct pmu_event *pe, void *data)
+{
+	struct pmu_sys_event_iter_data *idata = data;
+
+	if (!pe->name) {
+		if (pe->metric_group || pe->metric_name)
+			return 0;
+		return -EINVAL;
+	}
+
+	if (!pe->compat || !pe->pmu)
+		return 0;
+
+	if (!strcmp(pmu->id, pe->compat) &&
+	    pmu_uncore_alias_match(pe->pmu, pmu->name)) {
+		__perf_pmu__new_alias(idata->head, NULL,
+				      (char *)pe->name,
+				      (char *)pe->desc,
+				      (char *)pe->event,
+				      (char *)pe->long_desc,
+				      (char *)pe->topic,
+				      (char *)pe->unit,
+				      (char *)pe->perpkg,
+				      (char *)pe->metric_expr,
+				      (char *)pe->metric_name,
+				      (char *)pe->deprecated);
+	}
+
+	return 0;
+}
+
+static void pmu_add_sys_aliases(struct list_head *head, struct perf_pmu *pmu)
+{
+	struct pmu_sys_event_iter_data idata = {
+		.head = head,
+	};
+
+	pmu_for_each_sys_event(pmu, pmu_add_sys_aliases_iter_fn, &idata);
+}
+
 struct perf_event_attr * __weak
 perf_pmu__get_default_config(struct perf_pmu *pmu __maybe_unused)
 {
@@ -882,6 +960,7 @@ static struct perf_pmu *pmu_lookup(const char *name)
 		pmu->id = pmu_id(name);
 	pmu->max_precise = pmu_max_precise(name);
 	pmu_add_cpu_aliases(&aliases, pmu);
+	pmu_add_sys_aliases(&aliases, pmu);
 
 	INIT_LIST_HEAD(&pmu->format);
 	INIT_LIST_HEAD(&pmu->aliases);
diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
index 62ebca9481fe..e4bc9d192236 100644
--- a/tools/perf/util/pmu.h
+++ b/tools/perf/util/pmu.h
@@ -106,6 +106,11 @@ void pmu_add_cpu_aliases_map(struct list_head *head, struct perf_pmu *pmu,
 struct pmu_events_map *perf_pmu__find_map(struct perf_pmu *pmu);
 bool pmu_uncore_alias_match(const char *pmu_name, const char *name);
 
+typedef int (*pmu_sys_event_iter_fn)(struct perf_pmu *, struct pmu_event *pe,
+				     void *data);
+
+void pmu_for_each_sys_event(struct perf_pmu *pmu, pmu_sys_event_iter_fn fn,
+			    void *data);
 int perf_pmu__convert_scale(const char *scale, char **end, double *sval);
 
 #endif /* __PMU_H */
-- 
2.16.4