1 // SPDX-License-Identifier: GPL-2.0
2 #include <test_progs.h>
3 
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