1 // SPDX-License-Identifier: GPL-2.0
2 #include <inttypes.h>
3 #include <linux/compiler.h>
4 #include <linux/kernel.h>
5 #include "tests.h"
6 #include "map.h"
7 #include "maps.h"
8 #include "dso.h"
9 #include "debug.h"
10
11 struct map_def {
12 const char *name;
13 u64 start;
14 u64 end;
15 };
16
check_maps(struct map_def * merged,unsigned int size,struct maps * maps)17 static int check_maps(struct map_def *merged, unsigned int size, struct maps *maps)
18 {
19 struct map_rb_node *rb_node;
20 unsigned int i = 0;
21 bool failed = false;
22
23 if (maps__nr_maps(maps) != size) {
24 pr_debug("Expected %d maps, got %d", size, maps__nr_maps(maps));
25 failed = true;
26 } else {
27 maps__for_each_entry(maps, rb_node) {
28 struct map *map = rb_node->map;
29
30 if (map__start(map) != merged[i].start ||
31 map__end(map) != merged[i].end ||
32 strcmp(map__dso(map)->name, merged[i].name) ||
33 refcount_read(map__refcnt(map)) != 1) {
34 failed = true;
35 }
36 i++;
37 }
38 }
39 if (failed) {
40 pr_debug("Expected:\n");
41 for (i = 0; i < size; i++) {
42 pr_debug("\tstart: %" PRIu64 " end: %" PRIu64 " name: '%s' refcnt: 1\n",
43 merged[i].start, merged[i].end, merged[i].name);
44 }
45 pr_debug("Got:\n");
46 maps__for_each_entry(maps, rb_node) {
47 struct map *map = rb_node->map;
48
49 pr_debug("\tstart: %" PRIu64 " end: %" PRIu64 " name: '%s' refcnt: %d\n",
50 map__start(map),
51 map__end(map),
52 map__dso(map)->name,
53 refcount_read(map__refcnt(map)));
54 }
55 }
56 return failed ? TEST_FAIL : TEST_OK;
57 }
58
test__maps__merge_in(struct test_suite * t __maybe_unused,int subtest __maybe_unused)59 static int test__maps__merge_in(struct test_suite *t __maybe_unused, int subtest __maybe_unused)
60 {
61 unsigned int i;
62 struct map_def bpf_progs[] = {
63 { "bpf_prog_1", 200, 300 },
64 { "bpf_prog_2", 500, 600 },
65 { "bpf_prog_3", 800, 900 },
66 };
67 struct map_def merged12[] = {
68 { "kcore1", 100, 200 },
69 { "bpf_prog_1", 200, 300 },
70 { "kcore1", 300, 500 },
71 { "bpf_prog_2", 500, 600 },
72 { "kcore1", 600, 800 },
73 { "bpf_prog_3", 800, 900 },
74 { "kcore1", 900, 1000 },
75 };
76 struct map_def merged3[] = {
77 { "kcore1", 100, 200 },
78 { "bpf_prog_1", 200, 300 },
79 { "kcore1", 300, 500 },
80 { "bpf_prog_2", 500, 600 },
81 { "kcore1", 600, 800 },
82 { "bpf_prog_3", 800, 900 },
83 { "kcore1", 900, 1000 },
84 { "kcore3", 1000, 1100 },
85 };
86 struct map *map_kcore1, *map_kcore2, *map_kcore3;
87 int ret;
88 struct maps *maps = maps__new(NULL);
89
90 TEST_ASSERT_VAL("failed to create maps", maps);
91
92 for (i = 0; i < ARRAY_SIZE(bpf_progs); i++) {
93 struct map *map;
94
95 map = dso__new_map(bpf_progs[i].name);
96 TEST_ASSERT_VAL("failed to create map", map);
97
98 map__set_start(map, bpf_progs[i].start);
99 map__set_end(map, bpf_progs[i].end);
100 TEST_ASSERT_VAL("failed to insert map", maps__insert(maps, map) == 0);
101 map__put(map);
102 }
103
104 map_kcore1 = dso__new_map("kcore1");
105 TEST_ASSERT_VAL("failed to create map", map_kcore1);
106
107 map_kcore2 = dso__new_map("kcore2");
108 TEST_ASSERT_VAL("failed to create map", map_kcore2);
109
110 map_kcore3 = dso__new_map("kcore3");
111 TEST_ASSERT_VAL("failed to create map", map_kcore3);
112
113 /* kcore1 map overlaps over all bpf maps */
114 map__set_start(map_kcore1, 100);
115 map__set_end(map_kcore1, 1000);
116
117 /* kcore2 map hides behind bpf_prog_2 */
118 map__set_start(map_kcore2, 550);
119 map__set_end(map_kcore2, 570);
120
121 /* kcore3 map hides behind bpf_prog_3, kcore1 and adds new map */
122 map__set_start(map_kcore3, 880);
123 map__set_end(map_kcore3, 1100);
124
125 ret = maps__merge_in(maps, map_kcore1);
126 TEST_ASSERT_VAL("failed to merge map", !ret);
127
128 ret = check_maps(merged12, ARRAY_SIZE(merged12), maps);
129 TEST_ASSERT_VAL("merge check failed", !ret);
130
131 ret = maps__merge_in(maps, map_kcore2);
132 TEST_ASSERT_VAL("failed to merge map", !ret);
133
134 ret = check_maps(merged12, ARRAY_SIZE(merged12), maps);
135 TEST_ASSERT_VAL("merge check failed", !ret);
136
137 ret = maps__merge_in(maps, map_kcore3);
138 TEST_ASSERT_VAL("failed to merge map", !ret);
139
140 ret = check_maps(merged3, ARRAY_SIZE(merged3), maps);
141 TEST_ASSERT_VAL("merge check failed", !ret);
142
143 maps__zput(maps);
144 return TEST_OK;
145 }
146
147 DEFINE_SUITE("maps__merge_in", maps__merge_in);
148