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>

3 files changed, 83 insertions, 10 deletions

diff --git a/tools/perf/pmu-events/empty-pmu-events.c b/tools/perf/pmu-events/empty-pmu-events.c
index 4182a986f505..216ea0482c37 100644
--- a/tools/perf/pmu-events/empty-pmu-events.c
+++ b/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;
+}
diff --git a/tools/perf/pmu-events/jevents.py b/tools/perf/pmu-events/jevents.py
index 84fbb0f384cc..8f929dd3e065 100755
--- a/tools/perf/pmu-events/jevents.py
+++ b/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(
-      '\nconst struct pmu_sys_events pmu_sys_event_tables[] = {\n')
+  _args.output_file.write("""
+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():
diff --git a/tools/perf/pmu-events/pmu-events.h b/tools/perf/pmu-events/pmu-events.h
index a491b117c8ac..2386212b1df0 100644
--- a/tools/perf/pmu-events/pmu-events.h
+++ b/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