1// SPDX-License-Identifier: GPL-2.0
2#include <test_progs.h>
3
4static void test_task_fd_query_tp_core(const char *probe_name,
5				       const char *tp_name)
6{
7	const char *file = "./test_tracepoint.bpf.o";
8	int err, bytes, efd, prog_fd, pmu_fd;
9	struct perf_event_attr attr = {};
10	__u64 probe_offset, probe_addr;
11	__u32 len, prog_id, fd_type;
12	struct bpf_object *obj = NULL;
13	__u32 duration = 0;
14	char buf[256];
15
16	err = bpf_prog_test_load(file, BPF_PROG_TYPE_TRACEPOINT, &obj, &prog_fd);
17	if (CHECK(err, "bpf_prog_test_load", "err %d errno %d\n", err, errno))
18		goto close_prog;
19
20	if (access("/sys/kernel/tracing/trace", F_OK) == 0) {
21		snprintf(buf, sizeof(buf),
22			 "/sys/kernel/tracing/events/%s/id", probe_name);
23	} else {
24		snprintf(buf, sizeof(buf),
25			 "/sys/kernel/debug/tracing/events/%s/id", probe_name);
26	}
27	efd = open(buf, O_RDONLY, 0);
28	if (CHECK(efd < 0, "open", "err %d errno %d\n", efd, errno))
29		goto close_prog;
30	bytes = read(efd, buf, sizeof(buf));
31	close(efd);
32	if (CHECK(bytes <= 0 || bytes >= sizeof(buf), "read",
33		  "bytes %d errno %d\n", bytes, errno))
34		goto close_prog;
35
36	attr.config = strtol(buf, NULL, 0);
37	attr.type = PERF_TYPE_TRACEPOINT;
38	attr.sample_type = PERF_SAMPLE_RAW;
39	attr.sample_period = 1;
40	attr.wakeup_events = 1;
41	pmu_fd = syscall(__NR_perf_event_open, &attr, -1 /* pid */,
42			 0 /* cpu 0 */, -1 /* group id */,
43			 0 /* flags */);
44	if (CHECK(err, "perf_event_open", "err %d errno %d\n", err, errno))
45		goto close_pmu;
46
47	err = ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE, 0);
48	if (CHECK(err, "perf_event_ioc_enable", "err %d errno %d\n", err,
49		  errno))
50		goto close_pmu;
51
52	err = ioctl(pmu_fd, PERF_EVENT_IOC_SET_BPF, prog_fd);
53	if (CHECK(err, "perf_event_ioc_set_bpf", "err %d errno %d\n", err,
54		  errno))
55		goto close_pmu;
56
57	/* query (getpid(), pmu_fd) */
58	len = sizeof(buf);
59	err = bpf_task_fd_query(getpid(), pmu_fd, 0, buf, &len, &prog_id,
60				&fd_type, &probe_offset, &probe_addr);
61	if (CHECK(err < 0, "bpf_task_fd_query", "err %d errno %d\n", err,
62		  errno))
63		goto close_pmu;
64
65	err = (fd_type == BPF_FD_TYPE_TRACEPOINT) && !strcmp(buf, tp_name);
66	if (CHECK(!err, "check_results", "fd_type %d tp_name %s\n",
67		  fd_type, buf))
68		goto close_pmu;
69
70close_pmu:
71	close(pmu_fd);
72close_prog:
73	bpf_object__close(obj);
74}
75
76void test_task_fd_query_tp(void)
77{
78	test_task_fd_query_tp_core("sched/sched_switch",
79				   "sched_switch");
80	test_task_fd_query_tp_core("syscalls/sys_enter_read",
81				   "sys_enter_read");
82}
83