1 // SPDX-License-Identifier: GPL-2.0
2 #include <test_progs.h>
3
test_stacktrace_map(void)4 void test_stacktrace_map(void)
5 {
6 int control_map_fd, stackid_hmap_fd, stackmap_fd, stack_amap_fd;
7 const char *prog_name = "tracepoint/sched/sched_switch";
8 int err, prog_fd, stack_trace_len;
9 const char *file = "./test_stacktrace_map.o";
10 __u32 key, val, duration = 0;
11 struct bpf_program *prog;
12 struct bpf_object *obj;
13 struct bpf_link *link;
14
15 err = bpf_prog_load(file, BPF_PROG_TYPE_TRACEPOINT, &obj, &prog_fd);
16 if (CHECK(err, "prog_load", "err %d errno %d\n", err, errno))
17 return;
18
19 prog = bpf_object__find_program_by_title(obj, prog_name);
20 if (CHECK(!prog, "find_prog", "prog '%s' not found\n", prog_name))
21 goto close_prog;
22
23 link = bpf_program__attach_tracepoint(prog, "sched", "sched_switch");
24 if (CHECK(IS_ERR(link), "attach_tp", "err %ld\n", PTR_ERR(link)))
25 goto close_prog;
26
27 /* find map fds */
28 control_map_fd = bpf_find_map(__func__, obj, "control_map");
29 if (CHECK_FAIL(control_map_fd < 0))
30 goto disable_pmu;
31
32 stackid_hmap_fd = bpf_find_map(__func__, obj, "stackid_hmap");
33 if (CHECK_FAIL(stackid_hmap_fd < 0))
34 goto disable_pmu;
35
36 stackmap_fd = bpf_find_map(__func__, obj, "stackmap");
37 if (CHECK_FAIL(stackmap_fd < 0))
38 goto disable_pmu;
39
40 stack_amap_fd = bpf_find_map(__func__, obj, "stack_amap");
41 if (CHECK_FAIL(stack_amap_fd < 0))
42 goto disable_pmu;
43
44 /* give some time for bpf program run */
45 sleep(1);
46
47 /* disable stack trace collection */
48 key = 0;
49 val = 1;
50 bpf_map_update_elem(control_map_fd, &key, &val, 0);
51
52 /* for every element in stackid_hmap, we can find a corresponding one
53 * in stackmap, and vise versa.
54 */
55 err = compare_map_keys(stackid_hmap_fd, stackmap_fd);
56 if (CHECK(err, "compare_map_keys stackid_hmap vs. stackmap",
57 "err %d errno %d\n", err, errno))
58 goto disable_pmu;
59
60 err = compare_map_keys(stackmap_fd, stackid_hmap_fd);
61 if (CHECK(err, "compare_map_keys stackmap vs. stackid_hmap",
62 "err %d errno %d\n", err, errno))
63 goto disable_pmu;
64
65 stack_trace_len = PERF_MAX_STACK_DEPTH * sizeof(__u64);
66 err = compare_stack_ips(stackmap_fd, stack_amap_fd, stack_trace_len);
67 if (CHECK(err, "compare_stack_ips stackmap vs. stack_amap",
68 "err %d errno %d\n", err, errno))
69 goto disable_pmu;
70
71 disable_pmu:
72 bpf_link__destroy(link);
73 close_prog:
74 bpf_object__close(obj);
75 }
76