1// SPDX-License-Identifier: GPL-2.0
2#include <test_progs.h>
3
4void test_stacktrace_map(void)
5{
6	int control_map_fd, stackid_hmap_fd, stackmap_fd, stack_amap_fd;
7	const char *prog_name = "oncpu";
8	int err, prog_fd, stack_trace_len;
9	const char *file = "./test_stacktrace_map.bpf.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_test_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_name(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 (!ASSERT_OK_PTR(link, "attach_tp"))
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
71disable_pmu:
72	bpf_link__destroy(link);
73close_prog:
74	bpf_object__close(obj);
75}
76