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 "maps.h"
7 #include "dso.h"
8 #include "debug.h"
9
10 struct map_def {
11 const char *name;
12 u64 start;
13 u64 end;
14 };
15
check_maps(struct map_def * merged,unsigned int size,struct maps * maps)16 static int check_maps(struct map_def *merged, unsigned int size, struct maps *maps)
17 {
18 struct map *map;
19 unsigned int i = 0;
20
21 maps__for_each_entry(maps, map) {
22 if (i > 0)
23 TEST_ASSERT_VAL("less maps expected", (map && i < size) || (!map && i == size));
24
25 TEST_ASSERT_VAL("wrong map start", map->start == merged[i].start);
26 TEST_ASSERT_VAL("wrong map end", map->end == merged[i].end);
27 TEST_ASSERT_VAL("wrong map name", !strcmp(map->dso->name, merged[i].name));
28 TEST_ASSERT_VAL("wrong map refcnt", refcount_read(&map->refcnt) == 1);
29
30 i++;
31 }
32
33 return TEST_OK;
34 }
35
test__maps__merge_in(struct test_suite * t __maybe_unused,int subtest __maybe_unused)36 static int test__maps__merge_in(struct test_suite *t __maybe_unused, int subtest __maybe_unused)
37 {
38 unsigned int i;
39 struct map_def bpf_progs[] = {
40 { "bpf_prog_1", 200, 300 },
41 { "bpf_prog_2", 500, 600 },
42 { "bpf_prog_3", 800, 900 },
43 };
44 struct map_def merged12[] = {
45 { "kcore1", 100, 200 },
46 { "bpf_prog_1", 200, 300 },
47 { "kcore1", 300, 500 },
48 { "bpf_prog_2", 500, 600 },
49 { "kcore1", 600, 800 },
50 { "bpf_prog_3", 800, 900 },
51 { "kcore1", 900, 1000 },
52 };
53 struct map_def merged3[] = {
54 { "kcore1", 100, 200 },
55 { "bpf_prog_1", 200, 300 },
56 { "kcore1", 300, 500 },
57 { "bpf_prog_2", 500, 600 },
58 { "kcore1", 600, 800 },
59 { "bpf_prog_3", 800, 900 },
60 { "kcore1", 900, 1000 },
61 { "kcore3", 1000, 1100 },
62 };
63 struct map *map_kcore1, *map_kcore2, *map_kcore3;
64 int ret;
65 struct maps *maps = maps__new(NULL);
66
67 TEST_ASSERT_VAL("failed to create maps", maps);
68
69 for (i = 0; i < ARRAY_SIZE(bpf_progs); i++) {
70 struct map *map;
71
72 map = dso__new_map(bpf_progs[i].name);
73 TEST_ASSERT_VAL("failed to create map", map);
74
75 map->start = bpf_progs[i].start;
76 map->end = bpf_progs[i].end;
77 maps__insert(maps, map);
78 map__put(map);
79 }
80
81 map_kcore1 = dso__new_map("kcore1");
82 TEST_ASSERT_VAL("failed to create map", map_kcore1);
83
84 map_kcore2 = dso__new_map("kcore2");
85 TEST_ASSERT_VAL("failed to create map", map_kcore2);
86
87 map_kcore3 = dso__new_map("kcore3");
88 TEST_ASSERT_VAL("failed to create map", map_kcore3);
89
90 /* kcore1 map overlaps over all bpf maps */
91 map_kcore1->start = 100;
92 map_kcore1->end = 1000;
93
94 /* kcore2 map hides behind bpf_prog_2 */
95 map_kcore2->start = 550;
96 map_kcore2->end = 570;
97
98 /* kcore3 map hides behind bpf_prog_3, kcore1 and adds new map */
99 map_kcore3->start = 880;
100 map_kcore3->end = 1100;
101
102 ret = maps__merge_in(maps, map_kcore1);
103 TEST_ASSERT_VAL("failed to merge map", !ret);
104
105 ret = check_maps(merged12, ARRAY_SIZE(merged12), maps);
106 TEST_ASSERT_VAL("merge check failed", !ret);
107
108 ret = maps__merge_in(maps, map_kcore2);
109 TEST_ASSERT_VAL("failed to merge map", !ret);
110
111 ret = check_maps(merged12, ARRAY_SIZE(merged12), maps);
112 TEST_ASSERT_VAL("merge check failed", !ret);
113
114 ret = maps__merge_in(maps, map_kcore3);
115 TEST_ASSERT_VAL("failed to merge map", !ret);
116
117 ret = check_maps(merged3, ARRAY_SIZE(merged3), maps);
118 TEST_ASSERT_VAL("merge check failed", !ret);
119
120 maps__delete(maps);
121 return TEST_OK;
122 }
123
124 DEFINE_SUITE("maps__merge_in", maps__merge_in);
125