selftests/bpf: Add get_stackid_cannot_attach

This test confirms that BPF program that calls bpf_get_stackid() cannot
attach to perf_event with precise_ip > 0 but not PERF_SAMPLE_CALLCHAIN;
and cannot attach if the perf_event has exclude_callchain_kernel.

Signed-off-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200723180648.1429892-6-songliubraving@fb.com

diff --git a/tools/testing/selftests/bpf/prog_tests/get_stackid_cannot_attach.c b/tools/testing/selftests/bpf/prog_tests/get_stackid_cannot_attach.c
new file mode 100644 (file)
index 0000000..d884b2e
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/get_stackid_cannot_attach.c
@@ -0,0 +1,91 @@
+// 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 = {
+               /* .type = PERF_TYPE_SOFTWARE, */
+               .type = PERF_TYPE_HARDWARE,
+               .config = PERF_COUNT_HW_CPU_CYCLES,
+               .precise_ip = 1,
+               .sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_BRANCH_STACK,
+               .branch_sample_type = PERF_SAMPLE_BRANCH_USER |
+                       PERF_SAMPLE_BRANCH_NO_FLAGS |
+                       PERF_SAMPLE_BRANCH_NO_CYCLES |
+                       PERF_SAMPLE_BRANCH_CALL_STACK,
+               .sample_period = 5000,
+               .size = sizeof(struct perf_event_attr),
+       };
+       struct test_stacktrace_build_id *skel;
+       __u32 duration = 0;
+       int pmu_fd, err;
+
+       skel = 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 = test_stacktrace_build_id__load(skel);
+       if (CHECK(err, "skel_load", "skeleton load failed: %d\n", err))
+               goto cleanup;
+
+       pmu_fd = syscall(__NR_perf_event_open, &attr, -1 /* pid */,
+                        0 /* cpu 0 */, -1 /* group id */,
+                        0 /* flags */);
+       if (pmu_fd < 0 && (errno == ENOENT || errno == EOPNOTSUPP)) {
+               printf("%s:SKIP:cannot open PERF_COUNT_HW_CPU_CYCLES with precise_ip > 0\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 = bpf_program__attach_perf_event(skel->progs.oncpu,
+                                                          pmu_fd);
+       CHECK(!IS_ERR(skel->links.oncpu), "attach_perf_event_no_callchain",
+             "should have failed\n");
+       close(pmu_fd);
+
+       /* add PERF_SAMPLE_CALLCHAIN, attach should succeed */
+       attr.sample_type |= PERF_SAMPLE_CALLCHAIN;
+
+       pmu_fd = syscall(__NR_perf_event_open, &attr, -1 /* pid */,
+                        0 /* cpu 0 */, -1 /* group id */,
+                        0 /* flags */);
+
+       if (CHECK(pmu_fd < 0, "perf_event_open", "err %d errno %d\n",
+                 pmu_fd, errno))
+               goto cleanup;
+
+       skel->links.oncpu = bpf_program__attach_perf_event(skel->progs.oncpu,
+                                                          pmu_fd);
+       CHECK(IS_ERR(skel->links.oncpu), "attach_perf_event_callchain",
+             "err: %ld\n", PTR_ERR(skel->links.oncpu));
+       close(pmu_fd);
+
+       /* add exclude_callchain_kernel, attach should fail */
+       attr.exclude_callchain_kernel = 1;
+
+       pmu_fd = syscall(__NR_perf_event_open, &attr, -1 /* pid */,
+                        0 /* cpu 0 */, -1 /* group id */,
+                        0 /* flags */);
+
+       if (CHECK(pmu_fd < 0, "perf_event_open", "err %d errno %d\n",
+                 pmu_fd, errno))
+               goto cleanup;
+
+       skel->links.oncpu = bpf_program__attach_perf_event(skel->progs.oncpu,
+                                                          pmu_fd);
+       CHECK(!IS_ERR(skel->links.oncpu), "attach_perf_event_exclude_callchain_kernel",
+             "should have failed\n");
+       close(pmu_fd);
+
+cleanup:
+       test_stacktrace_build_id__destroy(skel);
+}