1// SPDX-License-Identifier: GPL-2.0
  2#include <linux/compiler.h>
  3#include <linux/kernel.h>
  4#include "tests.h"
  5#include "map.h"
  6#include "map_groups.h"
  7#include "dso.h"
  8#include "debug.h"
  9
 10struct map_def {
 11	const char *name;
 12	u64 start;
 13	u64 end;
 14};
 15
 16static int check_maps(struct map_def *merged, unsigned int size, struct map_groups *mg)
 17{
 18	struct map *map;
 19	unsigned int i = 0;
 20
 21	map = map_groups__first(mg);
 22	while (map) {
 23		TEST_ASSERT_VAL("wrong map start",  map->start == merged[i].start);
 24		TEST_ASSERT_VAL("wrong map end",    map->end == merged[i].end);
 25		TEST_ASSERT_VAL("wrong map name",  !strcmp(map->dso->name, merged[i].name));
 26		TEST_ASSERT_VAL("wrong map refcnt", refcount_read(&map->refcnt) == 2);
 27
 28		i++;
 29		map = map_groups__next(map);
 30
 31		TEST_ASSERT_VAL("less maps expected", (map && i < size) || (!map && i == size));
 32	}
 33
 34	return TEST_OK;
 35}
 36
 37int test__map_groups__merge_in(struct test *t __maybe_unused, int subtest __maybe_unused)
 38{
 39	struct map_groups mg;
 40	unsigned int i;
 41	struct map_def bpf_progs[] = {
 42		{ "bpf_prog_1", 200, 300 },
 43		{ "bpf_prog_2", 500, 600 },
 44		{ "bpf_prog_3", 800, 900 },
 45	};
 46	struct map_def merged12[] = {
 47		{ "kcore1",     100,  200 },
 48		{ "bpf_prog_1", 200,  300 },
 49		{ "kcore1",     300,  500 },
 50		{ "bpf_prog_2", 500,  600 },
 51		{ "kcore1",     600,  800 },
 52		{ "bpf_prog_3", 800,  900 },
 53		{ "kcore1",     900, 1000 },
 54	};
 55	struct map_def merged3[] = {
 56		{ "kcore1",      100,  200 },
 57		{ "bpf_prog_1",  200,  300 },
 58		{ "kcore1",      300,  500 },
 59		{ "bpf_prog_2",  500,  600 },
 60		{ "kcore1",      600,  800 },
 61		{ "bpf_prog_3",  800,  900 },
 62		{ "kcore1",      900, 1000 },
 63		{ "kcore3",     1000, 1100 },
 64	};
 65	struct map *map_kcore1, *map_kcore2, *map_kcore3;
 66	int ret;
 67
 68	map_groups__init(&mg, NULL);
 69
 70	for (i = 0; i < ARRAY_SIZE(bpf_progs); i++) {
 71		struct map *map;
 72
 73		map = dso__new_map(bpf_progs[i].name);
 74		TEST_ASSERT_VAL("failed to create map", map);
 75
 76		map->start = bpf_progs[i].start;
 77		map->end   = bpf_progs[i].end;
 78		map_groups__insert(&mg, map);
 79		map__put(map);
 80	}
 81
 82	map_kcore1 = dso__new_map("kcore1");
 83	TEST_ASSERT_VAL("failed to create map", map_kcore1);
 84
 85	map_kcore2 = dso__new_map("kcore2");
 86	TEST_ASSERT_VAL("failed to create map", map_kcore2);
 87
 88	map_kcore3 = dso__new_map("kcore3");
 89	TEST_ASSERT_VAL("failed to create map", map_kcore3);
 90
 91	/* kcore1 map overlaps over all bpf maps */
 92	map_kcore1->start = 100;
 93	map_kcore1->end   = 1000;
 94
 95	/* kcore2 map hides behind bpf_prog_2 */
 96	map_kcore2->start = 550;
 97	map_kcore2->end   = 570;
 98
 99	/* kcore3 map hides behind bpf_prog_3, kcore1 and adds new map */
100	map_kcore3->start = 880;
101	map_kcore3->end   = 1100;
102
103	ret = map_groups__merge_in(&mg, map_kcore1);
104	TEST_ASSERT_VAL("failed to merge map", !ret);
105
106	ret = check_maps(merged12, ARRAY_SIZE(merged12), &mg);
107	TEST_ASSERT_VAL("merge check failed", !ret);
108
109	ret = map_groups__merge_in(&mg, map_kcore2);
110	TEST_ASSERT_VAL("failed to merge map", !ret);
111
112	ret = check_maps(merged12, ARRAY_SIZE(merged12), &mg);
113	TEST_ASSERT_VAL("merge check failed", !ret);
114
115	ret = map_groups__merge_in(&mg, map_kcore3);
116	TEST_ASSERT_VAL("failed to merge map", !ret);
117
118	ret = check_maps(merged3, ARRAY_SIZE(merged3), &mg);
119	TEST_ASSERT_VAL("merge check failed", !ret);
120	return TEST_OK;
121}