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	snprintf(buf, sizeof(buf),
21		 "/sys/kernel/debug/tracing/events/%s/id", probe_name);
22	efd = open(buf, O_RDONLY, 0);
23	if (CHECK(efd < 0, "open", "err %d errno %d\n", efd, errno))
24		goto close_prog;
25	bytes = read(efd, buf, sizeof(buf));
26	close(efd);
27	if (CHECK(bytes <= 0 || bytes >= sizeof(buf), "read",
28		  "bytes %d errno %d\n", bytes, errno))
29		goto close_prog;
30
31	attr.config = strtol(buf, NULL, 0);
32	attr.type = PERF_TYPE_TRACEPOINT;
33	attr.sample_type = PERF_SAMPLE_RAW;
34	attr.sample_period = 1;
35	attr.wakeup_events = 1;
36	pmu_fd = syscall(__NR_perf_event_open, &attr, -1 /* pid */,
37			 0 /* cpu 0 */, -1 /* group id */,
38			 0 /* flags */);
39	if (CHECK(err, "perf_event_open", "err %d errno %d\n", err, errno))
40		goto close_pmu;
41
42	err = ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE, 0);
43	if (CHECK(err, "perf_event_ioc_enable", "err %d errno %d\n", err,
44		  errno))
45		goto close_pmu;
46
47	err = ioctl(pmu_fd, PERF_EVENT_IOC_SET_BPF, prog_fd);
48	if (CHECK(err, "perf_event_ioc_set_bpf", "err %d errno %d\n", err,
49		  errno))
50		goto close_pmu;
51
52	/* query (getpid(), pmu_fd) */
53	len = sizeof(buf);
54	err = bpf_task_fd_query(getpid(), pmu_fd, 0, buf, &len, &prog_id,
55				&fd_type, &probe_offset, &probe_addr);
56	if (CHECK(err < 0, "bpf_task_fd_query", "err %d errno %d\n", err,
57		  errno))
58		goto close_pmu;
59
60	err = (fd_type == BPF_FD_TYPE_TRACEPOINT) && !strcmp(buf, tp_name);
61	if (CHECK(!err, "check_results", "fd_type %d tp_name %s\n",
62		  fd_type, buf))
63		goto close_pmu;
64
65close_pmu:
66	close(pmu_fd);
67close_prog:
68	bpf_object__close(obj);
69}
70
71void test_task_fd_query_tp(void)
72{
73	test_task_fd_query_tp_core("sched/sched_switch",
74				   "sched_switch");
75	test_task_fd_query_tp_core("syscalls/sys_enter_read",
76				   "sys_enter_read");
77}