perf pmu-events: Hide pmu_sys_event_tables

Move usage of the table to pmu-events.c so it may be hidden. By
abstracting the table the implementation can later be changed.

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.garry@huawei.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Will Deacon <will@kernel.org>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/20220812230949.683239-6-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/pmu-events/empty-pmu-events.c

@@ -6,6 +6,8 @@
  * The test cpu/soc is provided for testing.
  */
 #include "pmu-events/pmu-events.h"
+#include <string.h>
+#include <stddef.h>
 
 static const struct pmu_event pme_test_soc_cpu[] = {
 	{
@@ -145,7 +147,12 @@ static const struct pmu_event pme_test_soc_sys[] = {
 	},
 };
 
-const struct pmu_sys_events pmu_sys_event_tables[] = {
+struct pmu_sys_events {
+	const char *name;
+	const struct pmu_event *table;
+};
+
+static const struct pmu_sys_events pmu_sys_event_tables[] = {
 	{
 		.table = pme_test_soc_sys,
 		.name = "pme_test_soc_sys",
@@ -154,3 +161,31 @@ const struct pmu_sys_events pmu_sys_event_tables[] = {
 		.table = 0
 	},
 };
+
+const struct pmu_event *find_sys_events_table(const char *name)
+{
+	for (const struct pmu_sys_events *tables = &pmu_sys_event_tables[0];
+	     tables->name;
+	     tables++) {
+		if (!strcmp(tables->name, name))
+			return tables->table;
+	}
+	return NULL;
+}
+
+int pmu_for_each_sys_event(pmu_event_iter_fn fn, void *data)
+{
+	for (const struct pmu_sys_events *tables = &pmu_sys_event_tables[0];
+	     tables->name;
+	     tables++) {
+		for (const struct pmu_event *pe = &tables->table[0];
+		     pe->name || pe->metric_group || pe->metric_name;
+		     pe++) {
+			int ret = fn(pe, data);
+
+			if (ret)
+				return ret;
+		}
+	}
+	return 0;
+}

tools/perf/pmu-events/jevents.py

@@ -371,8 +371,14 @@ def print_mapping_table(archs: Sequence[str]) -> None:
 
 def print_system_mapping_table() -> None:
   """C struct mapping table array for tables from /sys directories."""
-  _args.output_file.write(
+  _args.output_file.write("""
-      '\nconst struct pmu_sys_events pmu_sys_event_tables[] = {\n')
+struct pmu_sys_events {
+\tconst char *name;
+\tconst struct pmu_event *table;
+};
+
+static const struct pmu_sys_events pmu_sys_event_tables[] = {
+""")
   for tblname in _sys_event_tables:
     _args.output_file.write(f"""\t{{
 \t\t.table = {tblname},
@@ -383,6 +389,34 @@ def print_system_mapping_table() -> None:
 \t\t.table = 0
 \t},
 };
+
+const struct pmu_event *find_sys_events_table(const char *name)
+{
+        for (const struct pmu_sys_events *tables = &pmu_sys_event_tables[0];
+             tables->name;
+             tables++) {
+                if (!strcmp(tables->name, name))
+                        return tables->table;
+        }
+        return NULL;
+}
+
+int pmu_for_each_sys_event(pmu_event_iter_fn fn, void *data)
+{
+        for (const struct pmu_sys_events *tables = &pmu_sys_event_tables[0];
+             tables->name;
+             tables++) {
+                for (const struct pmu_event *pe = &tables->table[0];
+                     pe->name || pe->metric_group || pe->metric_name;
+                     pe++) {
+                        int ret = fn(pe, data);
+
+                        if (ret)
+                                return ret;
+                }
+        }
+        return 0;
+}
 """)
 
 
@@ -414,7 +448,12 @@ def main() -> None:
       'output_file', type=argparse.FileType('w'), nargs='?', default=sys.stdout)
   _args = ap.parse_args()
 
-  _args.output_file.write("#include \"pmu-events/pmu-events.h\"\n")
+  _args.output_file.write("""
+#include "pmu-events/pmu-events.h"
+#include <string.h>
+#include <stddef.h>
+
+""")
   archs = []
   for item in os.scandir(_args.starting_dir):
     if not item.is_dir():

tools/perf/pmu-events/pmu-events.h

@@ -43,16 +43,15 @@ struct pmu_events_map {
 	const struct pmu_event *table;
 };
 
-struct pmu_sys_events {
-	const char *name;
-	const struct pmu_event *table;
-};
-
 /*
  * Global table mapping each known CPU for the architecture to its
  * table of PMU events.
  */
 extern const struct pmu_events_map pmu_events_map[];
-extern const struct pmu_sys_events pmu_sys_event_tables[];
+
+const struct pmu_event *find_sys_events_table(const char *name);
+
+typedef int (*pmu_event_iter_fn)(const struct pmu_event *pe, void *data);
+int pmu_for_each_sys_event(pmu_event_iter_fn fn, void *data);
 
 #endif

tools/perf/tests/pmu-events.c

@@ -286,18 +286,6 @@ static const struct pmu_events_map *__test_pmu_get_events_map(void)
 	return NULL;
 }
 
-static const struct pmu_event *__test_pmu_get_sys_events_table(void)
-{
-	const struct pmu_sys_events *tables = &pmu_sys_event_tables[0];
-
-	for ( ; tables->name; tables++) {
-		if (!strcmp("pme_test_soc_sys", tables->name))
-			return tables->table;
-	}
-
-	return NULL;
-}
-
 static int compare_pmu_events(const struct pmu_event *e1, const struct pmu_event *e2)
 {
 	if (!is_same(e1->name, e2->name)) {
@@ -451,7 +439,7 @@ static int compare_alias_to_test_event(struct perf_pmu_alias *alias,
 static int test__pmu_event_table(struct test_suite *test __maybe_unused,
 				 int subtest __maybe_unused)
 {
-	const struct pmu_event *sys_event_tables = __test_pmu_get_sys_events_table();
+	const struct pmu_event *sys_event_tables = find_sys_events_table("pme_test_soc_sys");
 	const struct pmu_events_map *map = __test_pmu_get_events_map();
 	const struct pmu_event *table;
 	int map_events = 0, expected_events;

tools/perf/util/pmu.c

@@ -868,33 +868,6 @@ 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(pmu_sys_event_iter_fn fn, void *data)
-{
-	int i = 0;
-
-	while (1) {
-		const struct pmu_sys_events *event_table;
-		int j = 0;
-
-		event_table = &pmu_sys_event_tables[i++];
-
-		if (!event_table->table)
-			break;
-
-		while (1) {
-			const struct pmu_event *pe = &event_table->table[j++];
-			int ret;
-
-			if (!pe->name && !pe->metric_group && !pe->metric_name)
-				break;
-
-			ret = fn(pe, data);
-			if (ret)
-				break;
-		}
-	}
-}
-
 struct pmu_sys_event_iter_data {
 	struct list_head *head;
 	struct perf_pmu *pmu;

tools/perf/util/pmu.h

@@ -133,8 +133,6 @@ const struct pmu_events_map *pmu_events_map__find(void);
 bool pmu_uncore_alias_match(const char *pmu_name, const char *name);
 void perf_pmu_free_alias(struct perf_pmu_alias *alias);
 
-typedef int (*pmu_sys_event_iter_fn)(const struct pmu_event *pe, void *data);
-void pmu_for_each_sys_event(pmu_sys_event_iter_fn fn, void *data);
 int perf_pmu__convert_scale(const char *scale, char **end, double *sval);
 
 int perf_pmu__caps_parse(struct perf_pmu *pmu);