Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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}