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// SPDX-License-Identifier: GPL-2.0
#include <test_progs.h>
static void test_task_fd_query_tp_core(const char *probe_name,
const char *tp_name)
{
const char *file = "./test_tracepoint.o";
int err, bytes, efd, prog_fd, pmu_fd;
struct perf_event_attr attr = {};
__u64 probe_offset, probe_addr;
__u32 len, prog_id, fd_type;
struct bpf_object *obj;
__u32 duration = 0;
char buf[256];
err = bpf_prog_load(file, BPF_PROG_TYPE_TRACEPOINT, &obj, &prog_fd);
if (CHECK(err, "bpf_prog_load", "err %d errno %d\n", err, errno))
goto close_prog;
snprintf(buf, sizeof(buf),
"/sys/kernel/debug/tracing/events/%s/id", probe_name);
efd = open(buf, O_RDONLY, 0);
if (CHECK(efd < 0, "open", "err %d errno %d\n", efd, errno))
goto close_prog;
bytes = read(efd, buf, sizeof(buf));
close(efd);
if (CHECK(bytes <= 0 || bytes >= sizeof(buf), "read",
"bytes %d errno %d\n", bytes, errno))
goto close_prog;
attr.config = strtol(buf, NULL, 0);
attr.type = PERF_TYPE_TRACEPOINT;
attr.sample_type = PERF_SAMPLE_RAW;
attr.sample_period = 1;
attr.wakeup_events = 1;
pmu_fd = syscall(__NR_perf_event_open, &attr, -1 /* pid */,
0 /* cpu 0 */, -1 /* group id */,
0 /* flags */);
if (CHECK(err, "perf_event_open", "err %d errno %d\n", err, errno))
goto close_pmu;
err = ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE, 0);
if (CHECK(err, "perf_event_ioc_enable", "err %d errno %d\n", err,
errno))
goto close_pmu;
err = ioctl(pmu_fd, PERF_EVENT_IOC_SET_BPF, prog_fd);
if (CHECK(err, "perf_event_ioc_set_bpf", "err %d errno %d\n", err,
errno))
goto close_pmu;
/* query (getpid(), pmu_fd) */
len = sizeof(buf);
err = bpf_task_fd_query(getpid(), pmu_fd, 0, buf, &len, &prog_id,
&fd_type, &probe_offset, &probe_addr);
if (CHECK(err < 0, "bpf_task_fd_query", "err %d errno %d\n", err,
errno))
goto close_pmu;
err = (fd_type == BPF_FD_TYPE_TRACEPOINT) && !strcmp(buf, tp_name);
if (CHECK(!err, "check_results", "fd_type %d tp_name %s\n",
fd_type, buf))
goto close_pmu;
close(pmu_fd);
goto close_prog_noerr;
close_pmu:
close(pmu_fd);
close_prog:
error_cnt++;
close_prog_noerr:
bpf_object__close(obj);
}
void test_task_fd_query_tp(void)
{
test_task_fd_query_tp_core("sched/sched_switch",
"sched_switch");
test_task_fd_query_tp_core("syscalls/sys_enter_read",
"sys_enter_read");
}
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