1 // SPDX-License-Identifier: GPL-2.0
2 #include <test_progs.h>
3
test_task_fd_query_tp_core(const char * probe_name,const char * tp_name)4 static 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
70 close_pmu:
71 close(pmu_fd);
72 close_prog:
73 bpf_object__close(obj);
74 }
75
test_task_fd_query_tp(void)76 void 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