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selftests/bpf: switch test to new attach_perf_event API

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Use new bpf_program__attach_perf_event() in test previously relying on
direct ioctl manipulations.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Reviewed-by: Stanislav Fomichev <sdf@google.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Andrii Nakryiko 2019-07-01 16:59:01 -07:00 committed by Daniel Borkmann
parent 84bf5e1f4f
commit 8c51b314d2
1 changed files with 15 additions and 16 deletions
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31
tools/testing/selftests/bpf/prog_tests/stacktrace_build_id_nmi.c
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@ -17,6 +17,7 @@ static __u64 read_perf_max_sample_freq(void)
void test_stacktrace_build_id_nmi(void)
{
int control_map_fd, stackid_hmap_fd, stackmap_fd, stack_amap_fd;
const char *prog_name = "tracepoint/random/urandom_read";
const char *file = "./test_stacktrace_build_id.o";
int err, pmu_fd, prog_fd;
struct perf_event_attr attr = {
@ -25,7 +26,9 @@ void test_stacktrace_build_id_nmi(void)
.config = PERF_COUNT_HW_CPU_CYCLES,
};
__u32 key, previous_key, val, duration = 0;
struct bpf_program *prog;
struct bpf_object *obj;
struct bpf_link *link;
char buf[256];
int i, j;
struct bpf_stack_build_id id_offs[PERF_MAX_STACK_DEPTH];
@ -39,6 +42,10 @@ retry:
if (CHECK(err, "prog_load", "err %d errno %d\n", err, errno))
return;
prog = bpf_object__find_program_by_title(obj, prog_name);
if (CHECK(!prog, "find_prog", "prog '%s' not found\n", prog_name))
goto close_prog;
pmu_fd = syscall(__NR_perf_event_open, &attr, -1 /* pid */,
0 /* cpu 0 */, -1 /* group id */,
0 /* flags */);
@ -47,15 +54,12 @@ retry:
pmu_fd, errno))
goto close_prog;
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 disable_pmu;
link = bpf_program__attach_perf_event(prog, pmu_fd);
if (CHECK(IS_ERR(link), "attach_perf_event",
"err %ld\n", PTR_ERR(link))) {
close(pmu_fd);
goto close_prog;
}
/* find map fds */
control_map_fd = bpf_find_map(__func__, obj, "control_map");
@ -134,8 +138,7 @@ retry:
* try it one more time.
*/
if (build_id_matches < 1 && retry--) {
ioctl(pmu_fd, PERF_EVENT_IOC_DISABLE);
close(pmu_fd);
bpf_link__destroy(link);
bpf_object__close(obj);
printf("%s:WARN:Didn't find expected build ID from the map, retrying\n",
__func__);
@ -154,11 +157,7 @@ retry:
*/
disable_pmu:
ioctl(pmu_fd, PERF_EVENT_IOC_DISABLE);
close_pmu:
close(pmu_fd);
bpf_link__destroy(link);
close_prog:
bpf_object__close(obj);
}