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Subject: [PATCH bpf-next 4/5] selftests/bpf: add get_stackid_cannot_attach
Date:   Fri, 10 Jul 2020 18:26:38 -0700
Message-ID: <20200711012639.3429622-5-songliubraving@fb.com>
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This test confirms that BPF program that calls bpf_get_stackid() cannot
attach to perf_event with PEBS entry.

Signed-off-by: Song Liu <songliubraving@fb.com>
---
 .../prog_tests/get_stackid_cannot_attach.c    | 57 +++++++++++++++++++
 1 file changed, 57 insertions(+)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/get_stackid_ca=
nnot_attach.c

diff --git a/tools/testing/selftests/bpf/prog_tests/get_stackid_cannot_at=
tach.c b/tools/testing/selftests/bpf/prog_tests/get_stackid_cannot_attach=
.c
new file mode 100644
index 0000000000000..ae943c502b62b
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/get_stackid_cannot_attach.c
@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2020 Facebook
+#include <test_progs.h>
+#include "test_stacktrace_build_id.skel.h"
+
+void test_get_stackid_cannot_attach(void)
+{
+	struct perf_event_attr attr =3D {
+		/* .type =3D PERF_TYPE_SOFTWARE, */
+		.type =3D PERF_TYPE_HARDWARE,
+		.config =3D PERF_COUNT_HW_CPU_CYCLES,
+		.precise_ip =3D 2,
+		.sample_type =3D PERF_SAMPLE_IP | PERF_SAMPLE_BRANCH_STACK |
+			PERF_SAMPLE_CALLCHAIN,
+		.branch_sample_type =3D PERF_SAMPLE_BRANCH_USER |
+			PERF_SAMPLE_BRANCH_NO_FLAGS |
+			PERF_SAMPLE_BRANCH_NO_CYCLES |
+			PERF_SAMPLE_BRANCH_CALL_STACK,
+		.sample_period =3D 5000,
+		.size =3D sizeof(struct perf_event_attr),
+	};
+	struct test_stacktrace_build_id *skel;
+	__u32 duration =3D 0;
+	int pmu_fd, err;
+
+	skel =3D test_stacktrace_build_id__open();
+	if (CHECK(!skel, "skel_open", "skeleton open failed\n"))
+		return;
+
+	/* override program type */
+	bpf_program__set_perf_event(skel->progs.oncpu);
+
+	err =3D test_stacktrace_build_id__load(skel);
+	if (CHECK(err, "skel_load", "skeleton load failed: %d\n", err))
+		goto cleanup;
+
+	pmu_fd =3D syscall(__NR_perf_event_open, &attr, -1 /* pid */,
+			 0 /* cpu 0 */, -1 /* group id */,
+			 0 /* flags */);
+	if (pmu_fd < 0 && errno =3D=3D ENOENT) {
+		printf("%s:SKIP:no PERF_COUNT_HW_CPU_CYCLES\n", __func__);
+		test__skip();
+		goto cleanup;
+	}
+	if (CHECK(pmu_fd < 0, "perf_event_open", "err %d errno %d\n",
+		  pmu_fd, errno))
+		goto cleanup;
+
+	skel->links.oncpu =3D bpf_program__attach_perf_event(skel->progs.oncpu,
+							   pmu_fd);
+	CHECK(!IS_ERR(skel->links.oncpu), "attach_perf_event",
+	      "should have failed\n");
+	close(pmu_fd);
+
+cleanup:
+	test_stacktrace_build_id__destroy(skel);
+}
--=20
2.24.1