1 files changed, 122 insertions, 0 deletions
diff --git a/tools/perf/tests/maps.c b/tools/perf/tests/maps.c
new file mode 100644
index 000000000..1ac72919f
--- /dev/null
+++ b/tools/perf/tests/maps.c
@@ -0,0 +1,122 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/compiler.h>
+#include <linux/kernel.h>
+#include "tests.h"
+#include "map.h"
+#include "maps.h"
+#include "dso.h"
+#include "debug.h"
+
+struct map_def {
+	const char *name;
+	u64 start;
+	u64 end;
+};
+
+static int check_maps(struct map_def *merged, unsigned int size, struct maps *maps)
+{
+	struct map *map;
+	unsigned int i = 0;
+
+	maps__for_each_entry(maps, map) {
+		if (i > 0)
+			TEST_ASSERT_VAL("less maps expected", (map && i < size) || (!map && i == size));
+
+		TEST_ASSERT_VAL("wrong map start",  map->start == merged[i].start);
+		TEST_ASSERT_VAL("wrong map end",    map->end == merged[i].end);
+		TEST_ASSERT_VAL("wrong map name",  !strcmp(map->dso->name, merged[i].name));
+		TEST_ASSERT_VAL("wrong map refcnt", refcount_read(&map->refcnt) == 1);
+
+		i++;
+	}
+
+	return TEST_OK;
+}
+
+int test__maps__merge_in(struct test *t __maybe_unused, int subtest __maybe_unused)
+{
+	struct maps maps;
+	unsigned int i;
+	struct map_def bpf_progs[] = {
+		{ "bpf_prog_1", 200, 300 },
+		{ "bpf_prog_2", 500, 600 },
+		{ "bpf_prog_3", 800, 900 },
+	};
+	struct map_def merged12[] = {
+		{ "kcore1",     100,  200 },
+		{ "bpf_prog_1", 200,  300 },
+		{ "kcore1",     300,  500 },
+		{ "bpf_prog_2", 500,  600 },
+		{ "kcore1",     600,  800 },
+		{ "bpf_prog_3", 800,  900 },
+		{ "kcore1",     900, 1000 },
+	};
+	struct map_def merged3[] = {
+		{ "kcore1",      100,  200 },
+		{ "bpf_prog_1",  200,  300 },
+		{ "kcore1",      300,  500 },
+		{ "bpf_prog_2",  500,  600 },
+		{ "kcore1",      600,  800 },
+		{ "bpf_prog_3",  800,  900 },
+		{ "kcore1",      900, 1000 },
+		{ "kcore3",     1000, 1100 },
+	};
+	struct map *map_kcore1, *map_kcore2, *map_kcore3;
+	int ret;
+
+	maps__init(&maps, NULL);
+
+	for (i = 0; i < ARRAY_SIZE(bpf_progs); i++) {
+		struct map *map;
+
+		map = dso__new_map(bpf_progs[i].name);
+		TEST_ASSERT_VAL("failed to create map", map);
+
+		map->start = bpf_progs[i].start;
+		map->end   = bpf_progs[i].end;
+		maps__insert(&maps, map);
+		map__put(map);
+	}
+
+	map_kcore1 = dso__new_map("kcore1");
+	TEST_ASSERT_VAL("failed to create map", map_kcore1);
+
+	map_kcore2 = dso__new_map("kcore2");
+	TEST_ASSERT_VAL("failed to create map", map_kcore2);
+
+	map_kcore3 = dso__new_map("kcore3");
+	TEST_ASSERT_VAL("failed to create map", map_kcore3);
+
+	/* kcore1 map overlaps over all bpf maps */
+	map_kcore1->start = 100;
+	map_kcore1->end   = 1000;
+
+	/* kcore2 map hides behind bpf_prog_2 */
+	map_kcore2->start = 550;
+	map_kcore2->end   = 570;
+
+	/* kcore3 map hides behind bpf_prog_3, kcore1 and adds new map */
+	map_kcore3->start = 880;
+	map_kcore3->end   = 1100;
+
+	ret = maps__merge_in(&maps, map_kcore1);
+	TEST_ASSERT_VAL("failed to merge map", !ret);
+
+	ret = check_maps(merged12, ARRAY_SIZE(merged12), &maps);
+	TEST_ASSERT_VAL("merge check failed", !ret);
+
+	ret = maps__merge_in(&maps, map_kcore2);
+	TEST_ASSERT_VAL("failed to merge map", !ret);
+
+	ret = check_maps(merged12, ARRAY_SIZE(merged12), &maps);
+	TEST_ASSERT_VAL("merge check failed", !ret);
+
+	ret = maps__merge_in(&maps, map_kcore3);
+	TEST_ASSERT_VAL("failed to merge map", !ret);
+
+	ret = check_maps(merged3, ARRAY_SIZE(merged3), &maps);
+	TEST_ASSERT_VAL("merge check failed", !ret);
+
+	maps__exit(&maps);
+	return TEST_OK;
+}